Branch data Line data Source code
1 : : /*
2 : : * linux/fs/ext4/super.c
3 : : *
4 : : * Copyright (C) 1992, 1993, 1994, 1995
5 : : * Remy Card (card@masi.ibp.fr)
6 : : * Laboratoire MASI - Institut Blaise Pascal
7 : : * Universite Pierre et Marie Curie (Paris VI)
8 : : *
9 : : * from
10 : : *
11 : : * linux/fs/minix/inode.c
12 : : *
13 : : * Copyright (C) 1991, 1992 Linus Torvalds
14 : : *
15 : : * Big-endian to little-endian byte-swapping/bitmaps by
16 : : * David S. Miller (davem@caip.rutgers.edu), 1995
17 : : */
18 : :
19 : : #include <linux/module.h>
20 : : #include <linux/string.h>
21 : : #include <linux/fs.h>
22 : : #include <linux/time.h>
23 : : #include <linux/vmalloc.h>
24 : : #include <linux/jbd2.h>
25 : : #include <linux/slab.h>
26 : : #include <linux/init.h>
27 : : #include <linux/blkdev.h>
28 : : #include <linux/parser.h>
29 : : #include <linux/buffer_head.h>
30 : : #include <linux/exportfs.h>
31 : : #include <linux/vfs.h>
32 : : #include <linux/random.h>
33 : : #include <linux/mount.h>
34 : : #include <linux/namei.h>
35 : : #include <linux/quotaops.h>
36 : : #include <linux/seq_file.h>
37 : : #include <linux/proc_fs.h>
38 : : #include <linux/ctype.h>
39 : : #include <linux/log2.h>
40 : : #include <linux/crc16.h>
41 : : #include <linux/cleancache.h>
42 : : #include <asm/uaccess.h>
43 : :
44 : : #include <linux/kthread.h>
45 : : #include <linux/freezer.h>
46 : :
47 : : #include "ext4.h"
48 : : #include "ext4_extents.h" /* Needed for trace points definition */
49 : : #include "ext4_jbd2.h"
50 : : #include "xattr.h"
51 : : #include "acl.h"
52 : : #include "mballoc.h"
53 : :
54 : : #define CREATE_TRACE_POINTS
55 : : #include <trace/events/ext4.h>
56 : :
57 : : static struct proc_dir_entry *ext4_proc_root;
58 : : static struct kset *ext4_kset;
59 : : static struct ext4_lazy_init *ext4_li_info;
60 : : static struct mutex ext4_li_mtx;
61 : : static struct ext4_features *ext4_feat;
62 : :
63 : : static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
64 : : unsigned long journal_devnum);
65 : : static int ext4_show_options(struct seq_file *seq, struct dentry *root);
66 : : static int ext4_commit_super(struct super_block *sb, int sync);
67 : : static void ext4_mark_recovery_complete(struct super_block *sb,
68 : : struct ext4_super_block *es);
69 : : static void ext4_clear_journal_err(struct super_block *sb,
70 : : struct ext4_super_block *es);
71 : : static int ext4_sync_fs(struct super_block *sb, int wait);
72 : : static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
73 : : static int ext4_remount(struct super_block *sb, int *flags, char *data);
74 : : static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
75 : : static int ext4_unfreeze(struct super_block *sb);
76 : : static int ext4_freeze(struct super_block *sb);
77 : : static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 : : const char *dev_name, void *data);
79 : : static inline int ext2_feature_set_ok(struct super_block *sb);
80 : : static inline int ext3_feature_set_ok(struct super_block *sb);
81 : : static int ext4_feature_set_ok(struct super_block *sb, int readonly);
82 : : static void ext4_destroy_lazyinit_thread(void);
83 : : static void ext4_unregister_li_request(struct super_block *sb);
84 : : static void ext4_clear_request_list(void);
85 : : static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
86 : :
87 : : #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88 : : static struct file_system_type ext2_fs_type = {
89 : : .owner = THIS_MODULE,
90 : : .name = "ext2",
91 : : .mount = ext4_mount,
92 : : .kill_sb = kill_block_super,
93 : : .fs_flags = FS_REQUIRES_DEV,
94 : : };
95 : : MODULE_ALIAS_FS("ext2");
96 : : MODULE_ALIAS("ext2");
97 : : #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
98 : : #else
99 : : #define IS_EXT2_SB(sb) (0)
100 : : #endif
101 : :
102 : :
103 : : #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
104 : : static struct file_system_type ext3_fs_type = {
105 : : .owner = THIS_MODULE,
106 : : .name = "ext3",
107 : : .mount = ext4_mount,
108 : : .kill_sb = kill_block_super,
109 : : .fs_flags = FS_REQUIRES_DEV,
110 : : };
111 : : MODULE_ALIAS_FS("ext3");
112 : : MODULE_ALIAS("ext3");
113 : : #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
114 : : #else
115 : : #define IS_EXT3_SB(sb) (0)
116 : : #endif
117 : :
118 : 0 : static int ext4_verify_csum_type(struct super_block *sb,
119 : : struct ext4_super_block *es)
120 : : {
121 [ # # ]: 0 : if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
122 : : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
123 : : return 1;
124 : :
125 : 0 : return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
126 : : }
127 : :
128 : 0 : static __le32 ext4_superblock_csum(struct super_block *sb,
129 : : struct ext4_super_block *es)
130 : : {
131 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
132 : : int offset = offsetof(struct ext4_super_block, s_checksum);
133 : : __u32 csum;
134 : :
135 : : csum = ext4_chksum(sbi, ~0, (char *)es, offset);
136 : :
137 : 0 : return cpu_to_le32(csum);
138 : : }
139 : :
140 : 0 : int ext4_superblock_csum_verify(struct super_block *sb,
141 : : struct ext4_super_block *es)
142 : : {
143 [ # # ]: 0 : if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
144 : : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
145 : : return 1;
146 : :
147 : 0 : return es->s_checksum == ext4_superblock_csum(sb, es);
148 : : }
149 : :
150 : 0 : void ext4_superblock_csum_set(struct super_block *sb)
151 : : {
152 : 1145812 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
153 : :
154 [ - + ]: 1145812 : if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
155 : : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
156 : 0 : return;
157 : :
158 : 0 : es->s_checksum = ext4_superblock_csum(sb, es);
159 : : }
160 : :
161 : 0 : void *ext4_kvmalloc(size_t size, gfp_t flags)
162 : : {
163 : : void *ret;
164 : :
165 : 0 : ret = kmalloc(size, flags | __GFP_NOWARN);
166 [ # # ]: 0 : if (!ret)
167 : 0 : ret = __vmalloc(size, flags, PAGE_KERNEL);
168 : 0 : return ret;
169 : : }
170 : :
171 : 0 : void *ext4_kvzalloc(size_t size, gfp_t flags)
172 : : {
173 : : void *ret;
174 : :
175 : : ret = kzalloc(size, flags | __GFP_NOWARN);
176 [ # # ]: 0 : if (!ret)
177 : 0 : ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
178 : 0 : return ret;
179 : : }
180 : :
181 : 0 : void ext4_kvfree(void *ptr)
182 : : {
183 [ # # ]: 0 : if (is_vmalloc_addr(ptr))
184 : 0 : vfree(ptr);
185 : : else
186 : 0 : kfree(ptr);
187 : :
188 : 0 : }
189 : :
190 : 0 : ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
191 : : struct ext4_group_desc *bg)
192 : : {
193 : 494990 : return le32_to_cpu(bg->bg_block_bitmap_lo) |
194 : 494990 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
195 [ # # ][ # # ]: 494990 : (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
[ - + ]
196 : : }
197 : :
198 : 0 : ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
199 : : struct ext4_group_desc *bg)
200 : : {
201 : 1052476 : return le32_to_cpu(bg->bg_inode_bitmap_lo) |
202 : 1052476 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
203 [ # # ][ # # ]: 1052476 : (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
[ - + ]
204 : : }
205 : :
206 : 0 : ext4_fsblk_t ext4_inode_table(struct super_block *sb,
207 : : struct ext4_group_desc *bg)
208 : : {
209 : 11408714 : return le32_to_cpu(bg->bg_inode_table_lo) |
210 : 11408714 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
211 [ # # ][ # # ]: 11408714 : (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
[ - + ]
212 : : }
213 : :
214 : 0 : __u32 ext4_free_group_clusters(struct super_block *sb,
215 : : struct ext4_group_desc *bg)
216 : : {
217 : 562655 : return le16_to_cpu(bg->bg_free_blocks_count_lo) |
218 : 562655 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
219 [ # # ][ - + ]: 562655 : (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
220 : : }
221 : :
222 : 0 : __u32 ext4_free_inodes_count(struct super_block *sb,
223 : : struct ext4_group_desc *bg)
224 : : {
225 : 1943623 : return le16_to_cpu(bg->bg_free_inodes_count_lo) |
226 : 1943623 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
227 [ # # ][ - + ]: 1943623 : (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
228 : : }
229 : :
230 : 0 : __u32 ext4_used_dirs_count(struct super_block *sb,
231 : : struct ext4_group_desc *bg)
232 : : {
233 : 83530 : return le16_to_cpu(bg->bg_used_dirs_count_lo) |
234 : 83530 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
235 [ # # ][ - + ]: 83530 : (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
236 : : }
237 : :
238 : 0 : __u32 ext4_itable_unused_count(struct super_block *sb,
239 : : struct ext4_group_desc *bg)
240 : : {
241 : 465598 : return le16_to_cpu(bg->bg_itable_unused_lo) |
242 : 465598 : (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
243 [ - + ]: 465598 : (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
244 : : }
245 : :
246 : 0 : void ext4_block_bitmap_set(struct super_block *sb,
247 : : struct ext4_group_desc *bg, ext4_fsblk_t blk)
248 : : {
249 : 0 : bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
250 [ # # ]: 0 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
251 : 0 : bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
252 : 0 : }
253 : :
254 : 0 : void ext4_inode_bitmap_set(struct super_block *sb,
255 : : struct ext4_group_desc *bg, ext4_fsblk_t blk)
256 : : {
257 : 0 : bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
258 [ # # ]: 0 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
259 : 0 : bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
260 : 0 : }
261 : :
262 : 0 : void ext4_inode_table_set(struct super_block *sb,
263 : : struct ext4_group_desc *bg, ext4_fsblk_t blk)
264 : : {
265 : 0 : bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
266 [ # # ]: 0 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
267 : 0 : bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
268 : 0 : }
269 : :
270 : 0 : void ext4_free_group_clusters_set(struct super_block *sb,
271 : : struct ext4_group_desc *bg, __u32 count)
272 : : {
273 : 345165 : bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
274 [ - + ]: 345165 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
275 : 0 : bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
276 : 0 : }
277 : :
278 : 0 : void ext4_free_inodes_set(struct super_block *sb,
279 : : struct ext4_group_desc *bg, __u32 count)
280 : : {
281 : 923473 : bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
282 [ - + ]: 923473 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
283 : 0 : bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
284 : 0 : }
285 : :
286 : 0 : void ext4_used_dirs_set(struct super_block *sb,
287 : : struct ext4_group_desc *bg, __u32 count)
288 : : {
289 : 83530 : bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
290 [ - + ]: 83530 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
291 : 0 : bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
292 : 0 : }
293 : :
294 : 0 : void ext4_itable_unused_set(struct super_block *sb,
295 : : struct ext4_group_desc *bg, __u32 count)
296 : : {
297 : 15952 : bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
298 [ - + ]: 15952 : if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
299 : 0 : bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
300 : 0 : }
301 : :
302 : :
303 : 0 : static void __save_error_info(struct super_block *sb, const char *func,
304 : : unsigned int line)
305 : : {
306 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
307 : :
308 : 0 : EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
309 : 0 : es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
310 : 0 : es->s_last_error_time = cpu_to_le32(get_seconds());
311 : 0 : strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
312 : 0 : es->s_last_error_line = cpu_to_le32(line);
313 [ # # ]: 0 : if (!es->s_first_error_time) {
314 : 0 : es->s_first_error_time = es->s_last_error_time;
315 : 0 : strncpy(es->s_first_error_func, func,
316 : : sizeof(es->s_first_error_func));
317 : 0 : es->s_first_error_line = cpu_to_le32(line);
318 : 0 : es->s_first_error_ino = es->s_last_error_ino;
319 : 0 : es->s_first_error_block = es->s_last_error_block;
320 : : }
321 : : /*
322 : : * Start the daily error reporting function if it hasn't been
323 : : * started already
324 : : */
325 [ # # ]: 0 : if (!es->s_error_count)
326 : 0 : mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
327 : : le32_add_cpu(&es->s_error_count, 1);
328 : 0 : }
329 : :
330 : : static void save_error_info(struct super_block *sb, const char *func,
331 : : unsigned int line)
332 : : {
333 : 0 : __save_error_info(sb, func, line);
334 : 0 : ext4_commit_super(sb, 1);
335 : : }
336 : :
337 : : /*
338 : : * The del_gendisk() function uninitializes the disk-specific data
339 : : * structures, including the bdi structure, without telling anyone
340 : : * else. Once this happens, any attempt to call mark_buffer_dirty()
341 : : * (for example, by ext4_commit_super), will cause a kernel OOPS.
342 : : * This is a kludge to prevent these oops until we can put in a proper
343 : : * hook in del_gendisk() to inform the VFS and file system layers.
344 : : */
345 : : static int block_device_ejected(struct super_block *sb)
346 : : {
347 : 0 : struct inode *bd_inode = sb->s_bdev->bd_inode;
348 : 0 : struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
349 : :
350 : 0 : return bdi->dev == NULL;
351 : : }
352 : :
353 : 0 : static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
354 : : {
355 : 20656 : struct super_block *sb = journal->j_private;
356 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
357 : : int error = is_journal_aborted(journal);
358 : : struct ext4_journal_cb_entry *jce;
359 : :
360 [ - + ]: 20656 : BUG_ON(txn->t_state == T_FINISHED);
361 : : spin_lock(&sbi->s_md_lock);
362 [ + + ]: 91246 : while (!list_empty(&txn->t_private_list)) {
363 : : jce = list_entry(txn->t_private_list.next,
364 : : struct ext4_journal_cb_entry, jce_list);
365 : 70590 : list_del_init(&jce->jce_list);
366 : : spin_unlock(&sbi->s_md_lock);
367 : 70590 : jce->jce_func(sb, jce, error);
368 : : spin_lock(&sbi->s_md_lock);
369 : : }
370 : : spin_unlock(&sbi->s_md_lock);
371 : 20656 : }
372 : :
373 : : /* Deal with the reporting of failure conditions on a filesystem such as
374 : : * inconsistencies detected or read IO failures.
375 : : *
376 : : * On ext2, we can store the error state of the filesystem in the
377 : : * superblock. That is not possible on ext4, because we may have other
378 : : * write ordering constraints on the superblock which prevent us from
379 : : * writing it out straight away; and given that the journal is about to
380 : : * be aborted, we can't rely on the current, or future, transactions to
381 : : * write out the superblock safely.
382 : : *
383 : : * We'll just use the jbd2_journal_abort() error code to record an error in
384 : : * the journal instead. On recovery, the journal will complain about
385 : : * that error until we've noted it down and cleared it.
386 : : */
387 : :
388 : 0 : static void ext4_handle_error(struct super_block *sb)
389 : : {
390 [ # # ]: 0 : if (sb->s_flags & MS_RDONLY)
391 : 0 : return;
392 : :
393 [ # # ]: 0 : if (!test_opt(sb, ERRORS_CONT)) {
394 : 0 : journal_t *journal = EXT4_SB(sb)->s_journal;
395 : :
396 : 0 : EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
397 [ # # ]: 0 : if (journal)
398 : 0 : jbd2_journal_abort(journal, -EIO);
399 : : }
400 [ # # ]: 0 : if (test_opt(sb, ERRORS_RO)) {
401 : 0 : ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
402 : : /*
403 : : * Make sure updated value of ->s_mount_flags will be visible
404 : : * before ->s_flags update
405 : : */
406 : 0 : smp_wmb();
407 : 0 : sb->s_flags |= MS_RDONLY;
408 : : }
409 [ # # ]: 0 : if (test_opt(sb, ERRORS_PANIC))
410 : 0 : panic("EXT4-fs (device %s): panic forced after error\n",
411 : 0 : sb->s_id);
412 : : }
413 : :
414 : : #define ext4_error_ratelimit(sb) \
415 : : ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
416 : : "EXT4-fs error")
417 : :
418 : 0 : void __ext4_error(struct super_block *sb, const char *function,
419 : : unsigned int line, const char *fmt, ...)
420 : : {
421 : : struct va_format vaf;
422 : : va_list args;
423 : :
424 [ # # ]: 0 : if (ext4_error_ratelimit(sb)) {
425 : 0 : va_start(args, fmt);
426 : 0 : vaf.fmt = fmt;
427 : 0 : vaf.va = &args;
428 : 0 : printk(KERN_CRIT
429 : : "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
430 : 0 : sb->s_id, function, line, current->comm, &vaf);
431 : 0 : va_end(args);
432 : : }
433 : : save_error_info(sb, function, line);
434 : 0 : ext4_handle_error(sb);
435 : 0 : }
436 : :
437 : 0 : void __ext4_error_inode(struct inode *inode, const char *function,
438 : : unsigned int line, ext4_fsblk_t block,
439 : : const char *fmt, ...)
440 : : {
441 : : va_list args;
442 : : struct va_format vaf;
443 : 0 : struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
444 : :
445 : 0 : es->s_last_error_ino = cpu_to_le32(inode->i_ino);
446 : 0 : es->s_last_error_block = cpu_to_le64(block);
447 [ # # ]: 0 : if (ext4_error_ratelimit(inode->i_sb)) {
448 : 0 : va_start(args, fmt);
449 : 0 : vaf.fmt = fmt;
450 : 0 : vaf.va = &args;
451 [ # # ]: 0 : if (block)
452 : 0 : printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
453 : : "inode #%lu: block %llu: comm %s: %pV\n",
454 : 0 : inode->i_sb->s_id, function, line, inode->i_ino,
455 : 0 : block, current->comm, &vaf);
456 : : else
457 : 0 : printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
458 : : "inode #%lu: comm %s: %pV\n",
459 : 0 : inode->i_sb->s_id, function, line, inode->i_ino,
460 : 0 : current->comm, &vaf);
461 : 0 : va_end(args);
462 : : }
463 : 0 : save_error_info(inode->i_sb, function, line);
464 : 0 : ext4_handle_error(inode->i_sb);
465 : 0 : }
466 : :
467 : 0 : void __ext4_error_file(struct file *file, const char *function,
468 : : unsigned int line, ext4_fsblk_t block,
469 : : const char *fmt, ...)
470 : : {
471 : : va_list args;
472 : : struct va_format vaf;
473 : : struct ext4_super_block *es;
474 : : struct inode *inode = file_inode(file);
475 : : char pathname[80], *path;
476 : :
477 : 0 : es = EXT4_SB(inode->i_sb)->s_es;
478 : 0 : es->s_last_error_ino = cpu_to_le32(inode->i_ino);
479 [ # # ]: 0 : if (ext4_error_ratelimit(inode->i_sb)) {
480 : 0 : path = d_path(&(file->f_path), pathname, sizeof(pathname));
481 [ # # ]: 0 : if (IS_ERR(path))
482 : : path = "(unknown)";
483 : 0 : va_start(args, fmt);
484 : 0 : vaf.fmt = fmt;
485 : 0 : vaf.va = &args;
486 [ # # ]: 0 : if (block)
487 : 0 : printk(KERN_CRIT
488 : : "EXT4-fs error (device %s): %s:%d: inode #%lu: "
489 : : "block %llu: comm %s: path %s: %pV\n",
490 : 0 : inode->i_sb->s_id, function, line, inode->i_ino,
491 : 0 : block, current->comm, path, &vaf);
492 : : else
493 : 0 : printk(KERN_CRIT
494 : : "EXT4-fs error (device %s): %s:%d: inode #%lu: "
495 : : "comm %s: path %s: %pV\n",
496 : 0 : inode->i_sb->s_id, function, line, inode->i_ino,
497 : 0 : current->comm, path, &vaf);
498 : 0 : va_end(args);
499 : : }
500 : 0 : save_error_info(inode->i_sb, function, line);
501 : 0 : ext4_handle_error(inode->i_sb);
502 : 0 : }
503 : :
504 : 0 : const char *ext4_decode_error(struct super_block *sb, int errno,
505 : : char nbuf[16])
506 : : {
507 : : char *errstr = NULL;
508 : :
509 [ # # # # ]: 0 : switch (errno) {
510 : : case -EIO:
511 : : errstr = "IO failure";
512 : : break;
513 : : case -ENOMEM:
514 : : errstr = "Out of memory";
515 : 0 : break;
516 : : case -EROFS:
517 [ # # ][ # # ]: 0 : if (!sb || (EXT4_SB(sb)->s_journal &&
[ # # ]
518 : 0 : EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
519 : : errstr = "Journal has aborted";
520 : : else
521 : : errstr = "Readonly filesystem";
522 : : break;
523 : : default:
524 : : /* If the caller passed in an extra buffer for unknown
525 : : * errors, textualise them now. Else we just return
526 : : * NULL. */
527 [ # # ]: 0 : if (nbuf) {
528 : : /* Check for truncated error codes... */
529 [ # # ]: 0 : if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
530 : : errstr = nbuf;
531 : : }
532 : : break;
533 : : }
534 : :
535 : 0 : return errstr;
536 : : }
537 : :
538 : : /* __ext4_std_error decodes expected errors from journaling functions
539 : : * automatically and invokes the appropriate error response. */
540 : :
541 : 0 : void __ext4_std_error(struct super_block *sb, const char *function,
542 : : unsigned int line, int errno)
543 : : {
544 : : char nbuf[16];
545 : : const char *errstr;
546 : :
547 : : /* Special case: if the error is EROFS, and we're not already
548 : : * inside a transaction, then there's really no point in logging
549 : : * an error. */
550 [ # # ][ # # ]: 0 : if (errno == -EROFS && journal_current_handle() == NULL &&
[ # # ]
551 : 0 : (sb->s_flags & MS_RDONLY))
552 : 0 : return;
553 : :
554 [ # # ]: 0 : if (ext4_error_ratelimit(sb)) {
555 : 0 : errstr = ext4_decode_error(sb, errno, nbuf);
556 : 0 : printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
557 : 0 : sb->s_id, function, line, errstr);
558 : : }
559 : :
560 : : save_error_info(sb, function, line);
561 : 0 : ext4_handle_error(sb);
562 : : }
563 : :
564 : : /*
565 : : * ext4_abort is a much stronger failure handler than ext4_error. The
566 : : * abort function may be used to deal with unrecoverable failures such
567 : : * as journal IO errors or ENOMEM at a critical moment in log management.
568 : : *
569 : : * We unconditionally force the filesystem into an ABORT|READONLY state,
570 : : * unless the error response on the fs has been set to panic in which
571 : : * case we take the easy way out and panic immediately.
572 : : */
573 : :
574 : 0 : void __ext4_abort(struct super_block *sb, const char *function,
575 : : unsigned int line, const char *fmt, ...)
576 : : {
577 : : va_list args;
578 : :
579 : : save_error_info(sb, function, line);
580 : 0 : va_start(args, fmt);
581 : 0 : printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
582 : : function, line);
583 : 0 : vprintk(fmt, args);
584 : 0 : printk("\n");
585 : 0 : va_end(args);
586 : :
587 [ # # ]: 0 : if ((sb->s_flags & MS_RDONLY) == 0) {
588 : 0 : ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
589 : 0 : EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
590 : : /*
591 : : * Make sure updated value of ->s_mount_flags will be visible
592 : : * before ->s_flags update
593 : : */
594 : 0 : smp_wmb();
595 : 0 : sb->s_flags |= MS_RDONLY;
596 [ # # ]: 0 : if (EXT4_SB(sb)->s_journal)
597 : 0 : jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
598 : : save_error_info(sb, function, line);
599 : : }
600 [ # # ]: 0 : if (test_opt(sb, ERRORS_PANIC))
601 : 0 : panic("EXT4-fs panic from previous error\n");
602 : 0 : }
603 : :
604 : 0 : void __ext4_msg(struct super_block *sb,
605 : : const char *prefix, const char *fmt, ...)
606 : : {
607 : : struct va_format vaf;
608 : : va_list args;
609 : :
610 [ + - ]: 4 : if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
611 : 0 : return;
612 : :
613 : 4 : va_start(args, fmt);
614 : 4 : vaf.fmt = fmt;
615 : 4 : vaf.va = &args;
616 : 4 : printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
617 : 4 : va_end(args);
618 : : }
619 : :
620 : 0 : void __ext4_warning(struct super_block *sb, const char *function,
621 : : unsigned int line, const char *fmt, ...)
622 : : {
623 : : struct va_format vaf;
624 : : va_list args;
625 : :
626 [ # # ]: 0 : if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
627 : : "EXT4-fs warning"))
628 : 0 : return;
629 : :
630 : 0 : va_start(args, fmt);
631 : 0 : vaf.fmt = fmt;
632 : 0 : vaf.va = &args;
633 : 0 : printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
634 : 0 : sb->s_id, function, line, &vaf);
635 : 0 : va_end(args);
636 : : }
637 : :
638 : 0 : void __ext4_grp_locked_error(const char *function, unsigned int line,
639 : 0 : struct super_block *sb, ext4_group_t grp,
640 : : unsigned long ino, ext4_fsblk_t block,
641 : : const char *fmt, ...)
642 : : __releases(bitlock)
643 : : __acquires(bitlock)
644 : : {
645 : : struct va_format vaf;
646 : : va_list args;
647 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
648 : :
649 : 0 : es->s_last_error_ino = cpu_to_le32(ino);
650 : 0 : es->s_last_error_block = cpu_to_le64(block);
651 : 0 : __save_error_info(sb, function, line);
652 : :
653 [ # # ]: 0 : if (ext4_error_ratelimit(sb)) {
654 : 0 : va_start(args, fmt);
655 : 0 : vaf.fmt = fmt;
656 : 0 : vaf.va = &args;
657 : 0 : printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
658 : 0 : sb->s_id, function, line, grp);
659 [ # # ]: 0 : if (ino)
660 : 0 : printk(KERN_CONT "inode %lu: ", ino);
661 [ # # ]: 0 : if (block)
662 : 0 : printk(KERN_CONT "block %llu:",
663 : : (unsigned long long) block);
664 : 0 : printk(KERN_CONT "%pV\n", &vaf);
665 : 0 : va_end(args);
666 : : }
667 : :
668 [ # # ]: 0 : if (test_opt(sb, ERRORS_CONT)) {
669 : 0 : ext4_commit_super(sb, 0);
670 : 0 : return;
671 : : }
672 : :
673 : : ext4_unlock_group(sb, grp);
674 : 0 : ext4_handle_error(sb);
675 : : /*
676 : : * We only get here in the ERRORS_RO case; relocking the group
677 : : * may be dangerous, but nothing bad will happen since the
678 : : * filesystem will have already been marked read/only and the
679 : : * journal has been aborted. We return 1 as a hint to callers
680 : : * who might what to use the return value from
681 : : * ext4_grp_locked_error() to distinguish between the
682 : : * ERRORS_CONT and ERRORS_RO case, and perhaps return more
683 : : * aggressively from the ext4 function in question, with a
684 : : * more appropriate error code.
685 : : */
686 : : ext4_lock_group(sb, grp);
687 : : return;
688 : : }
689 : :
690 : 0 : void ext4_update_dynamic_rev(struct super_block *sb)
691 : : {
692 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
693 : :
694 [ # # ]: 0 : if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
695 : 0 : return;
696 : :
697 : 0 : ext4_warning(sb,
698 : : "updating to rev %d because of new feature flag, "
699 : : "running e2fsck is recommended",
700 : : EXT4_DYNAMIC_REV);
701 : :
702 : 0 : es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
703 : 0 : es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
704 : 0 : es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
705 : : /* leave es->s_feature_*compat flags alone */
706 : : /* es->s_uuid will be set by e2fsck if empty */
707 : :
708 : : /*
709 : : * The rest of the superblock fields should be zero, and if not it
710 : : * means they are likely already in use, so leave them alone. We
711 : : * can leave it up to e2fsck to clean up any inconsistencies there.
712 : : */
713 : : }
714 : :
715 : : /*
716 : : * Open the external journal device
717 : : */
718 : 0 : static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
719 : : {
720 : : struct block_device *bdev;
721 : : char b[BDEVNAME_SIZE];
722 : :
723 : 0 : bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
724 [ # # ]: 0 : if (IS_ERR(bdev))
725 : : goto fail;
726 : : return bdev;
727 : :
728 : : fail:
729 : 0 : ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
730 : : __bdevname(dev, b), PTR_ERR(bdev));
731 : 0 : return NULL;
732 : : }
733 : :
734 : : /*
735 : : * Release the journal device
736 : : */
737 : : static void ext4_blkdev_put(struct block_device *bdev)
738 : : {
739 : 0 : blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
740 : : }
741 : :
742 : : static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
743 : : {
744 : : struct block_device *bdev;
745 : 0 : bdev = sbi->journal_bdev;
746 [ # # # # ]: 0 : if (bdev) {
747 : : ext4_blkdev_put(bdev);
748 : 0 : sbi->journal_bdev = NULL;
749 : : }
750 : : }
751 : :
752 : : static inline struct inode *orphan_list_entry(struct list_head *l)
753 : : {
754 : : return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
755 : : }
756 : :
757 : 0 : static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
758 : : {
759 : : struct list_head *l;
760 : :
761 : 0 : ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
762 : : le32_to_cpu(sbi->s_es->s_last_orphan));
763 : :
764 : 0 : printk(KERN_ERR "sb_info orphan list:\n");
765 [ # # ]: 0 : list_for_each(l, &sbi->s_orphan) {
766 : 0 : struct inode *inode = orphan_list_entry(l);
767 : 0 : printk(KERN_ERR " "
768 : : "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
769 : 0 : inode->i_sb->s_id, inode->i_ino, inode,
770 : 0 : inode->i_mode, inode->i_nlink,
771 : : NEXT_ORPHAN(inode));
772 : : }
773 : 0 : }
774 : :
775 : 0 : static void ext4_put_super(struct super_block *sb)
776 : : {
777 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
778 : 0 : struct ext4_super_block *es = sbi->s_es;
779 : : int i, err;
780 : :
781 : 0 : ext4_unregister_li_request(sb);
782 : 0 : dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
783 : :
784 : 0 : flush_workqueue(sbi->rsv_conversion_wq);
785 : 0 : destroy_workqueue(sbi->rsv_conversion_wq);
786 : :
787 [ # # ]: 0 : if (sbi->s_journal) {
788 : 0 : err = jbd2_journal_destroy(sbi->s_journal);
789 : 0 : sbi->s_journal = NULL;
790 [ # # ]: 0 : if (err < 0)
791 : 0 : ext4_abort(sb, "Couldn't clean up the journal");
792 : : }
793 : :
794 : 0 : ext4_es_unregister_shrinker(sbi);
795 : 0 : del_timer_sync(&sbi->s_err_report);
796 : 0 : ext4_release_system_zone(sb);
797 : 0 : ext4_mb_release(sb);
798 : 0 : ext4_ext_release(sb);
799 : 0 : ext4_xattr_put_super(sb);
800 : :
801 [ # # ]: 0 : if (!(sb->s_flags & MS_RDONLY)) {
802 : 0 : EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
803 : 0 : es->s_state = cpu_to_le16(sbi->s_mount_state);
804 : : }
805 [ # # ]: 0 : if (!(sb->s_flags & MS_RDONLY))
806 : 0 : ext4_commit_super(sb, 1);
807 : :
808 [ # # ]: 0 : if (sbi->s_proc) {
809 : 0 : remove_proc_entry("options", sbi->s_proc);
810 : 0 : remove_proc_entry(sb->s_id, ext4_proc_root);
811 : : }
812 : 0 : kobject_del(&sbi->s_kobj);
813 : :
814 [ # # ]: 0 : for (i = 0; i < sbi->s_gdb_count; i++)
815 : 0 : brelse(sbi->s_group_desc[i]);
816 : 0 : ext4_kvfree(sbi->s_group_desc);
817 : 0 : ext4_kvfree(sbi->s_flex_groups);
818 : 0 : percpu_counter_destroy(&sbi->s_freeclusters_counter);
819 : 0 : percpu_counter_destroy(&sbi->s_freeinodes_counter);
820 : 0 : percpu_counter_destroy(&sbi->s_dirs_counter);
821 : 0 : percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
822 : 0 : percpu_counter_destroy(&sbi->s_extent_cache_cnt);
823 : 0 : brelse(sbi->s_sbh);
824 : : #ifdef CONFIG_QUOTA
825 [ # # ]: 0 : for (i = 0; i < MAXQUOTAS; i++)
826 : 0 : kfree(sbi->s_qf_names[i]);
827 : : #endif
828 : :
829 : : /* Debugging code just in case the in-memory inode orphan list
830 : : * isn't empty. The on-disk one can be non-empty if we've
831 : : * detected an error and taken the fs readonly, but the
832 : : * in-memory list had better be clean by this point. */
833 [ # # ]: 0 : if (!list_empty(&sbi->s_orphan))
834 : 0 : dump_orphan_list(sb, sbi);
835 [ # # ]: 0 : J_ASSERT(list_empty(&sbi->s_orphan));
836 : :
837 : 0 : invalidate_bdev(sb->s_bdev);
838 [ # # ][ # # ]: 0 : if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
839 : : /*
840 : : * Invalidate the journal device's buffers. We don't want them
841 : : * floating about in memory - the physical journal device may
842 : : * hotswapped, and it breaks the `ro-after' testing code.
843 : : */
844 : 0 : sync_blockdev(sbi->journal_bdev);
845 : 0 : invalidate_bdev(sbi->journal_bdev);
846 : : ext4_blkdev_remove(sbi);
847 : : }
848 [ # # ]: 0 : if (sbi->s_mmp_tsk)
849 : 0 : kthread_stop(sbi->s_mmp_tsk);
850 : 0 : sb->s_fs_info = NULL;
851 : : /*
852 : : * Now that we are completely done shutting down the
853 : : * superblock, we need to actually destroy the kobject.
854 : : */
855 : 0 : kobject_put(&sbi->s_kobj);
856 : 0 : wait_for_completion(&sbi->s_kobj_unregister);
857 [ # # ]: 0 : if (sbi->s_chksum_driver)
858 : : crypto_free_shash(sbi->s_chksum_driver);
859 : 0 : kfree(sbi->s_blockgroup_lock);
860 : 0 : kfree(sbi);
861 : 0 : }
862 : :
863 : : static struct kmem_cache *ext4_inode_cachep;
864 : :
865 : : /*
866 : : * Called inside transaction, so use GFP_NOFS
867 : : */
868 : 0 : static struct inode *ext4_alloc_inode(struct super_block *sb)
869 : : {
870 : : struct ext4_inode_info *ei;
871 : :
872 : 470960 : ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
873 [ + - ]: 470961 : if (!ei)
874 : : return NULL;
875 : :
876 : 470961 : ei->vfs_inode.i_version = 1;
877 : 470961 : INIT_LIST_HEAD(&ei->i_prealloc_list);
878 : 470961 : spin_lock_init(&ei->i_prealloc_lock);
879 : 470961 : ext4_es_init_tree(&ei->i_es_tree);
880 : 470958 : rwlock_init(&ei->i_es_lock);
881 : 470958 : INIT_LIST_HEAD(&ei->i_es_lru);
882 : 470958 : ei->i_es_lru_nr = 0;
883 : 470958 : ei->i_touch_when = 0;
884 : 470958 : ei->i_reserved_data_blocks = 0;
885 : 470958 : ei->i_reserved_meta_blocks = 0;
886 : 470958 : ei->i_allocated_meta_blocks = 0;
887 : 470958 : ei->i_da_metadata_calc_len = 0;
888 : 470958 : ei->i_da_metadata_calc_last_lblock = 0;
889 : 470958 : spin_lock_init(&(ei->i_block_reservation_lock));
890 : : #ifdef CONFIG_QUOTA
891 : 470958 : ei->i_reserved_quota = 0;
892 : : #endif
893 : 470958 : ei->jinode = NULL;
894 : 470958 : INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
895 : 470958 : spin_lock_init(&ei->i_completed_io_lock);
896 : 470958 : ei->i_sync_tid = 0;
897 : 470958 : ei->i_datasync_tid = 0;
898 : 470958 : atomic_set(&ei->i_ioend_count, 0);
899 : 470958 : atomic_set(&ei->i_unwritten, 0);
900 : 941916 : INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
901 : :
902 : 470958 : return &ei->vfs_inode;
903 : : }
904 : :
905 : 0 : static int ext4_drop_inode(struct inode *inode)
906 : : {
907 : : int drop = generic_drop_inode(inode);
908 : :
909 : : trace_ext4_drop_inode(inode, drop);
910 : 0 : return drop;
911 : : }
912 : :
913 : 0 : static void ext4_i_callback(struct rcu_head *head)
914 : : {
915 : : struct inode *inode = container_of(head, struct inode, i_rcu);
916 : 475931 : kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
917 : 476051 : }
918 : :
919 : 0 : static void ext4_destroy_inode(struct inode *inode)
920 : : {
921 [ - + ]: 476193 : if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
922 : 0 : ext4_msg(inode->i_sb, KERN_ERR,
923 : : "Inode %lu (%p): orphan list check failed!",
924 : : inode->i_ino, EXT4_I(inode));
925 : 0 : print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
926 : : EXT4_I(inode), sizeof(struct ext4_inode_info),
927 : : true);
928 : 0 : dump_stack();
929 : : }
930 : 476193 : call_rcu(&inode->i_rcu, ext4_i_callback);
931 : 476193 : }
932 : :
933 : 0 : static void init_once(void *foo)
934 : : {
935 : : struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
936 : :
937 : 245639 : INIT_LIST_HEAD(&ei->i_orphan);
938 : 245639 : init_rwsem(&ei->xattr_sem);
939 : 245640 : init_rwsem(&ei->i_data_sem);
940 : 245640 : inode_init_once(&ei->vfs_inode);
941 : 245640 : }
942 : :
943 : 0 : static int init_inodecache(void)
944 : : {
945 : 0 : ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
946 : : sizeof(struct ext4_inode_info),
947 : : 0, (SLAB_RECLAIM_ACCOUNT|
948 : : SLAB_MEM_SPREAD),
949 : : init_once);
950 [ # # ]: 0 : if (ext4_inode_cachep == NULL)
951 : : return -ENOMEM;
952 : 0 : return 0;
953 : : }
954 : :
955 : : static void destroy_inodecache(void)
956 : : {
957 : : /*
958 : : * Make sure all delayed rcu free inodes are flushed before we
959 : : * destroy cache.
960 : : */
961 : 0 : rcu_barrier();
962 : 0 : kmem_cache_destroy(ext4_inode_cachep);
963 : : }
964 : :
965 : 0 : void ext4_clear_inode(struct inode *inode)
966 : : {
967 : 476184 : invalidate_inode_buffers(inode);
968 : 476188 : clear_inode(inode);
969 : 476188 : dquot_drop(inode);
970 : 476188 : ext4_discard_preallocations(inode);
971 : 476192 : ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
972 : 476192 : ext4_es_lru_del(inode);
973 [ + + ]: 476193 : if (EXT4_I(inode)->jinode) {
974 : 335468 : jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
975 : : EXT4_I(inode)->jinode);
976 : 335468 : jbd2_free_inode(EXT4_I(inode)->jinode);
977 : 335468 : EXT4_I(inode)->jinode = NULL;
978 : : }
979 : 9 : }
980 : :
981 : 0 : static struct inode *ext4_nfs_get_inode(struct super_block *sb,
982 : : u64 ino, u32 generation)
983 : : {
984 : : struct inode *inode;
985 : :
986 [ # # ][ # # ]: 0 : if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
987 : : return ERR_PTR(-ESTALE);
988 [ # # ]: 0 : if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
989 : : return ERR_PTR(-ESTALE);
990 : :
991 : : /* iget isn't really right if the inode is currently unallocated!!
992 : : *
993 : : * ext4_read_inode will return a bad_inode if the inode had been
994 : : * deleted, so we should be safe.
995 : : *
996 : : * Currently we don't know the generation for parent directory, so
997 : : * a generation of 0 means "accept any"
998 : : */
999 : 0 : inode = ext4_iget(sb, ino);
1000 [ # # ]: 0 : if (IS_ERR(inode))
1001 : : return ERR_CAST(inode);
1002 [ # # ][ # # ]: 0 : if (generation && inode->i_generation != generation) {
1003 : 0 : iput(inode);
1004 : 0 : return ERR_PTR(-ESTALE);
1005 : : }
1006 : :
1007 : : return inode;
1008 : : }
1009 : :
1010 : 0 : static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1011 : : int fh_len, int fh_type)
1012 : : {
1013 : 0 : return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1014 : : ext4_nfs_get_inode);
1015 : : }
1016 : :
1017 : 0 : static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1018 : : int fh_len, int fh_type)
1019 : : {
1020 : 0 : return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1021 : : ext4_nfs_get_inode);
1022 : : }
1023 : :
1024 : : /*
1025 : : * Try to release metadata pages (indirect blocks, directories) which are
1026 : : * mapped via the block device. Since these pages could have journal heads
1027 : : * which would prevent try_to_free_buffers() from freeing them, we must use
1028 : : * jbd2 layer's try_to_free_buffers() function to release them.
1029 : : */
1030 : 0 : static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1031 : : gfp_t wait)
1032 : : {
1033 : 75954 : journal_t *journal = EXT4_SB(sb)->s_journal;
1034 : :
1035 [ - + ]: 75954 : WARN_ON(PageChecked(page));
1036 [ + - ]: 151907 : if (!page_has_buffers(page))
1037 : : return 0;
1038 [ + - ]: 75953 : if (journal)
1039 : 75953 : return jbd2_journal_try_to_free_buffers(journal, page,
1040 : : wait & ~__GFP_WAIT);
1041 : 0 : return try_to_free_buffers(page);
1042 : : }
1043 : :
1044 : : #ifdef CONFIG_QUOTA
1045 : : #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1046 : : #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1047 : :
1048 : : static int ext4_write_dquot(struct dquot *dquot);
1049 : : static int ext4_acquire_dquot(struct dquot *dquot);
1050 : : static int ext4_release_dquot(struct dquot *dquot);
1051 : : static int ext4_mark_dquot_dirty(struct dquot *dquot);
1052 : : static int ext4_write_info(struct super_block *sb, int type);
1053 : : static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1054 : : struct path *path);
1055 : : static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1056 : : int format_id);
1057 : : static int ext4_quota_off(struct super_block *sb, int type);
1058 : : static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1059 : : static int ext4_quota_on_mount(struct super_block *sb, int type);
1060 : : static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1061 : : size_t len, loff_t off);
1062 : : static ssize_t ext4_quota_write(struct super_block *sb, int type,
1063 : : const char *data, size_t len, loff_t off);
1064 : : static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1065 : : unsigned int flags);
1066 : : static int ext4_enable_quotas(struct super_block *sb);
1067 : :
1068 : : static const struct dquot_operations ext4_quota_operations = {
1069 : : .get_reserved_space = ext4_get_reserved_space,
1070 : : .write_dquot = ext4_write_dquot,
1071 : : .acquire_dquot = ext4_acquire_dquot,
1072 : : .release_dquot = ext4_release_dquot,
1073 : : .mark_dirty = ext4_mark_dquot_dirty,
1074 : : .write_info = ext4_write_info,
1075 : : .alloc_dquot = dquot_alloc,
1076 : : .destroy_dquot = dquot_destroy,
1077 : : };
1078 : :
1079 : : static const struct quotactl_ops ext4_qctl_operations = {
1080 : : .quota_on = ext4_quota_on,
1081 : : .quota_off = ext4_quota_off,
1082 : : .quota_sync = dquot_quota_sync,
1083 : : .get_info = dquot_get_dqinfo,
1084 : : .set_info = dquot_set_dqinfo,
1085 : : .get_dqblk = dquot_get_dqblk,
1086 : : .set_dqblk = dquot_set_dqblk
1087 : : };
1088 : :
1089 : : static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1090 : : .quota_on_meta = ext4_quota_on_sysfile,
1091 : : .quota_off = ext4_quota_off_sysfile,
1092 : : .quota_sync = dquot_quota_sync,
1093 : : .get_info = dquot_get_dqinfo,
1094 : : .set_info = dquot_set_dqinfo,
1095 : : .get_dqblk = dquot_get_dqblk,
1096 : : .set_dqblk = dquot_set_dqblk
1097 : : };
1098 : : #endif
1099 : :
1100 : : static const struct super_operations ext4_sops = {
1101 : : .alloc_inode = ext4_alloc_inode,
1102 : : .destroy_inode = ext4_destroy_inode,
1103 : : .write_inode = ext4_write_inode,
1104 : : .dirty_inode = ext4_dirty_inode,
1105 : : .drop_inode = ext4_drop_inode,
1106 : : .evict_inode = ext4_evict_inode,
1107 : : .put_super = ext4_put_super,
1108 : : .sync_fs = ext4_sync_fs,
1109 : : .freeze_fs = ext4_freeze,
1110 : : .unfreeze_fs = ext4_unfreeze,
1111 : : .statfs = ext4_statfs,
1112 : : .remount_fs = ext4_remount,
1113 : : .show_options = ext4_show_options,
1114 : : #ifdef CONFIG_QUOTA
1115 : : .quota_read = ext4_quota_read,
1116 : : .quota_write = ext4_quota_write,
1117 : : #endif
1118 : : .bdev_try_to_free_page = bdev_try_to_free_page,
1119 : : };
1120 : :
1121 : : static const struct super_operations ext4_nojournal_sops = {
1122 : : .alloc_inode = ext4_alloc_inode,
1123 : : .destroy_inode = ext4_destroy_inode,
1124 : : .write_inode = ext4_write_inode,
1125 : : .dirty_inode = ext4_dirty_inode,
1126 : : .drop_inode = ext4_drop_inode,
1127 : : .evict_inode = ext4_evict_inode,
1128 : : .sync_fs = ext4_sync_fs_nojournal,
1129 : : .put_super = ext4_put_super,
1130 : : .statfs = ext4_statfs,
1131 : : .remount_fs = ext4_remount,
1132 : : .show_options = ext4_show_options,
1133 : : #ifdef CONFIG_QUOTA
1134 : : .quota_read = ext4_quota_read,
1135 : : .quota_write = ext4_quota_write,
1136 : : #endif
1137 : : .bdev_try_to_free_page = bdev_try_to_free_page,
1138 : : };
1139 : :
1140 : : static const struct export_operations ext4_export_ops = {
1141 : : .fh_to_dentry = ext4_fh_to_dentry,
1142 : : .fh_to_parent = ext4_fh_to_parent,
1143 : : .get_parent = ext4_get_parent,
1144 : : };
1145 : :
1146 : : enum {
1147 : : Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1148 : : Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1149 : : Opt_nouid32, Opt_debug, Opt_removed,
1150 : : Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1151 : : Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1152 : : Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1153 : : Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1154 : : Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1155 : : Opt_data_err_abort, Opt_data_err_ignore,
1156 : : Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1157 : : Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1158 : : Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1159 : : Opt_usrquota, Opt_grpquota, Opt_i_version,
1160 : : Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1161 : : Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1162 : : Opt_inode_readahead_blks, Opt_journal_ioprio,
1163 : : Opt_dioread_nolock, Opt_dioread_lock,
1164 : : Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1165 : : Opt_max_dir_size_kb,
1166 : : };
1167 : :
1168 : : static const match_table_t tokens = {
1169 : : {Opt_bsd_df, "bsddf"},
1170 : : {Opt_minix_df, "minixdf"},
1171 : : {Opt_grpid, "grpid"},
1172 : : {Opt_grpid, "bsdgroups"},
1173 : : {Opt_nogrpid, "nogrpid"},
1174 : : {Opt_nogrpid, "sysvgroups"},
1175 : : {Opt_resgid, "resgid=%u"},
1176 : : {Opt_resuid, "resuid=%u"},
1177 : : {Opt_sb, "sb=%u"},
1178 : : {Opt_err_cont, "errors=continue"},
1179 : : {Opt_err_panic, "errors=panic"},
1180 : : {Opt_err_ro, "errors=remount-ro"},
1181 : : {Opt_nouid32, "nouid32"},
1182 : : {Opt_debug, "debug"},
1183 : : {Opt_removed, "oldalloc"},
1184 : : {Opt_removed, "orlov"},
1185 : : {Opt_user_xattr, "user_xattr"},
1186 : : {Opt_nouser_xattr, "nouser_xattr"},
1187 : : {Opt_acl, "acl"},
1188 : : {Opt_noacl, "noacl"},
1189 : : {Opt_noload, "norecovery"},
1190 : : {Opt_noload, "noload"},
1191 : : {Opt_removed, "nobh"},
1192 : : {Opt_removed, "bh"},
1193 : : {Opt_commit, "commit=%u"},
1194 : : {Opt_min_batch_time, "min_batch_time=%u"},
1195 : : {Opt_max_batch_time, "max_batch_time=%u"},
1196 : : {Opt_journal_dev, "journal_dev=%u"},
1197 : : {Opt_journal_path, "journal_path=%s"},
1198 : : {Opt_journal_checksum, "journal_checksum"},
1199 : : {Opt_journal_async_commit, "journal_async_commit"},
1200 : : {Opt_abort, "abort"},
1201 : : {Opt_data_journal, "data=journal"},
1202 : : {Opt_data_ordered, "data=ordered"},
1203 : : {Opt_data_writeback, "data=writeback"},
1204 : : {Opt_data_err_abort, "data_err=abort"},
1205 : : {Opt_data_err_ignore, "data_err=ignore"},
1206 : : {Opt_offusrjquota, "usrjquota="},
1207 : : {Opt_usrjquota, "usrjquota=%s"},
1208 : : {Opt_offgrpjquota, "grpjquota="},
1209 : : {Opt_grpjquota, "grpjquota=%s"},
1210 : : {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1211 : : {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1212 : : {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1213 : : {Opt_grpquota, "grpquota"},
1214 : : {Opt_noquota, "noquota"},
1215 : : {Opt_quota, "quota"},
1216 : : {Opt_usrquota, "usrquota"},
1217 : : {Opt_barrier, "barrier=%u"},
1218 : : {Opt_barrier, "barrier"},
1219 : : {Opt_nobarrier, "nobarrier"},
1220 : : {Opt_i_version, "i_version"},
1221 : : {Opt_stripe, "stripe=%u"},
1222 : : {Opt_delalloc, "delalloc"},
1223 : : {Opt_nodelalloc, "nodelalloc"},
1224 : : {Opt_removed, "mblk_io_submit"},
1225 : : {Opt_removed, "nomblk_io_submit"},
1226 : : {Opt_block_validity, "block_validity"},
1227 : : {Opt_noblock_validity, "noblock_validity"},
1228 : : {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1229 : : {Opt_journal_ioprio, "journal_ioprio=%u"},
1230 : : {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1231 : : {Opt_auto_da_alloc, "auto_da_alloc"},
1232 : : {Opt_noauto_da_alloc, "noauto_da_alloc"},
1233 : : {Opt_dioread_nolock, "dioread_nolock"},
1234 : : {Opt_dioread_lock, "dioread_lock"},
1235 : : {Opt_discard, "discard"},
1236 : : {Opt_nodiscard, "nodiscard"},
1237 : : {Opt_init_itable, "init_itable=%u"},
1238 : : {Opt_init_itable, "init_itable"},
1239 : : {Opt_noinit_itable, "noinit_itable"},
1240 : : {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1241 : : {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1242 : : {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1243 : : {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1244 : : {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1245 : : {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1246 : : {Opt_err, NULL},
1247 : : };
1248 : :
1249 : 0 : static ext4_fsblk_t get_sb_block(void **data)
1250 : : {
1251 : : ext4_fsblk_t sb_block;
1252 : 0 : char *options = (char *) *data;
1253 : :
1254 [ # # ][ # # ]: 0 : if (!options || strncmp(options, "sb=", 3) != 0)
1255 : : return 1; /* Default location */
1256 : :
1257 : 0 : options += 3;
1258 : : /* TODO: use simple_strtoll with >32bit ext4 */
1259 : 0 : sb_block = simple_strtoul(options, &options, 0);
1260 [ # # ]: 0 : if (*options && *options != ',') {
1261 : 0 : printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1262 : : (char *) *data);
1263 : 0 : return 1;
1264 : : }
1265 [ # # ]: 0 : if (*options == ',')
1266 : 0 : options++;
1267 : 0 : *data = (void *) options;
1268 : :
1269 : 0 : return sb_block;
1270 : : }
1271 : :
1272 : : #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1273 : : static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1274 : : "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1275 : :
1276 : : #ifdef CONFIG_QUOTA
1277 : 0 : static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1278 : : {
1279 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1280 : : char *qname;
1281 : : int ret = -1;
1282 : :
1283 [ # # ][ # # ]: 0 : if (sb_any_quota_loaded(sb) &&
1284 : 0 : !sbi->s_qf_names[qtype]) {
1285 : 0 : ext4_msg(sb, KERN_ERR,
1286 : : "Cannot change journaled "
1287 : : "quota options when quota turned on");
1288 : 0 : return -1;
1289 : : }
1290 [ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1291 : 0 : ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1292 : : "when QUOTA feature is enabled");
1293 : 0 : return -1;
1294 : : }
1295 : 0 : qname = match_strdup(args);
1296 [ # # ]: 0 : if (!qname) {
1297 : 0 : ext4_msg(sb, KERN_ERR,
1298 : : "Not enough memory for storing quotafile name");
1299 : 0 : return -1;
1300 : : }
1301 [ # # ]: 0 : if (sbi->s_qf_names[qtype]) {
1302 [ # # ]: 0 : if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1303 : : ret = 1;
1304 : : else
1305 [ # # ]: 0 : ext4_msg(sb, KERN_ERR,
1306 : : "%s quota file already specified",
1307 : : QTYPE2NAME(qtype));
1308 : : goto errout;
1309 : : }
1310 [ # # ]: 0 : if (strchr(qname, '/')) {
1311 : 0 : ext4_msg(sb, KERN_ERR,
1312 : : "quotafile must be on filesystem root");
1313 : 0 : goto errout;
1314 : : }
1315 : 0 : sbi->s_qf_names[qtype] = qname;
1316 : 0 : set_opt(sb, QUOTA);
1317 : 0 : return 1;
1318 : : errout:
1319 : 0 : kfree(qname);
1320 : 0 : return ret;
1321 : : }
1322 : :
1323 : 0 : static int clear_qf_name(struct super_block *sb, int qtype)
1324 : : {
1325 : :
1326 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1327 : :
1328 [ # # ][ # # ]: 0 : if (sb_any_quota_loaded(sb) &&
1329 : 0 : sbi->s_qf_names[qtype]) {
1330 : 0 : ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1331 : : " when quota turned on");
1332 : 0 : return -1;
1333 : : }
1334 : 0 : kfree(sbi->s_qf_names[qtype]);
1335 : 0 : sbi->s_qf_names[qtype] = NULL;
1336 : 0 : return 1;
1337 : : }
1338 : : #endif
1339 : :
1340 : : #define MOPT_SET 0x0001
1341 : : #define MOPT_CLEAR 0x0002
1342 : : #define MOPT_NOSUPPORT 0x0004
1343 : : #define MOPT_EXPLICIT 0x0008
1344 : : #define MOPT_CLEAR_ERR 0x0010
1345 : : #define MOPT_GTE0 0x0020
1346 : : #ifdef CONFIG_QUOTA
1347 : : #define MOPT_Q 0
1348 : : #define MOPT_QFMT 0x0040
1349 : : #else
1350 : : #define MOPT_Q MOPT_NOSUPPORT
1351 : : #define MOPT_QFMT MOPT_NOSUPPORT
1352 : : #endif
1353 : : #define MOPT_DATAJ 0x0080
1354 : : #define MOPT_NO_EXT2 0x0100
1355 : : #define MOPT_NO_EXT3 0x0200
1356 : : #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1357 : : #define MOPT_STRING 0x0400
1358 : :
1359 : : static const struct mount_opts {
1360 : : int token;
1361 : : int mount_opt;
1362 : : int flags;
1363 : : } ext4_mount_opts[] = {
1364 : : {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1365 : : {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1366 : : {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1367 : : {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1368 : : {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1369 : : {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1370 : : {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1371 : : MOPT_EXT4_ONLY | MOPT_SET},
1372 : : {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1373 : : MOPT_EXT4_ONLY | MOPT_CLEAR},
1374 : : {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1375 : : {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1376 : : {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1377 : : MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1378 : : {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1379 : : MOPT_EXT4_ONLY | MOPT_CLEAR},
1380 : : {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1381 : : MOPT_EXT4_ONLY | MOPT_SET},
1382 : : {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1383 : : EXT4_MOUNT_JOURNAL_CHECKSUM),
1384 : : MOPT_EXT4_ONLY | MOPT_SET},
1385 : : {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1386 : : {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1387 : : {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1388 : : {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1389 : : {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1390 : : MOPT_NO_EXT2 | MOPT_SET},
1391 : : {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1392 : : MOPT_NO_EXT2 | MOPT_CLEAR},
1393 : : {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1394 : : {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1395 : : {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1396 : : {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1397 : : {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1398 : : {Opt_commit, 0, MOPT_GTE0},
1399 : : {Opt_max_batch_time, 0, MOPT_GTE0},
1400 : : {Opt_min_batch_time, 0, MOPT_GTE0},
1401 : : {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1402 : : {Opt_init_itable, 0, MOPT_GTE0},
1403 : : {Opt_stripe, 0, MOPT_GTE0},
1404 : : {Opt_resuid, 0, MOPT_GTE0},
1405 : : {Opt_resgid, 0, MOPT_GTE0},
1406 : : {Opt_journal_dev, 0, MOPT_GTE0},
1407 : : {Opt_journal_path, 0, MOPT_STRING},
1408 : : {Opt_journal_ioprio, 0, MOPT_GTE0},
1409 : : {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1410 : : {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1411 : : {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1412 : : MOPT_NO_EXT2 | MOPT_DATAJ},
1413 : : {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1414 : : {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1415 : : #ifdef CONFIG_EXT4_FS_POSIX_ACL
1416 : : {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1417 : : {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1418 : : #else
1419 : : {Opt_acl, 0, MOPT_NOSUPPORT},
1420 : : {Opt_noacl, 0, MOPT_NOSUPPORT},
1421 : : #endif
1422 : : {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1423 : : {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1424 : : {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1425 : : {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1426 : : MOPT_SET | MOPT_Q},
1427 : : {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1428 : : MOPT_SET | MOPT_Q},
1429 : : {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1430 : : EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1431 : : {Opt_usrjquota, 0, MOPT_Q},
1432 : : {Opt_grpjquota, 0, MOPT_Q},
1433 : : {Opt_offusrjquota, 0, MOPT_Q},
1434 : : {Opt_offgrpjquota, 0, MOPT_Q},
1435 : : {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1436 : : {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1437 : : {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1438 : : {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1439 : : {Opt_err, 0, 0}
1440 : : };
1441 : :
1442 : 0 : static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1443 : : substring_t *args, unsigned long *journal_devnum,
1444 : : unsigned int *journal_ioprio, int is_remount)
1445 : : {
1446 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1447 : : const struct mount_opts *m;
1448 : : kuid_t uid;
1449 : : kgid_t gid;
1450 : 4 : int arg = 0;
1451 : :
1452 : : #ifdef CONFIG_QUOTA
1453 [ - + ]: 4 : if (token == Opt_usrjquota)
1454 : 0 : return set_qf_name(sb, USRQUOTA, &args[0]);
1455 [ - + ]: 4 : else if (token == Opt_grpjquota)
1456 : 0 : return set_qf_name(sb, GRPQUOTA, &args[0]);
1457 [ - + ]: 4 : else if (token == Opt_offusrjquota)
1458 : 0 : return clear_qf_name(sb, USRQUOTA);
1459 [ - + ]: 4 : else if (token == Opt_offgrpjquota)
1460 : 0 : return clear_qf_name(sb, GRPQUOTA);
1461 : : #endif
1462 [ - - - - : 4 : switch (token) {
+ - ]
1463 : : case Opt_noacl:
1464 : : case Opt_nouser_xattr:
1465 : 0 : ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1466 : 0 : break;
1467 : : case Opt_sb:
1468 : : return 1; /* handled by get_sb_block() */
1469 : : case Opt_removed:
1470 : 0 : ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1471 : 0 : return 1;
1472 : : case Opt_abort:
1473 : 0 : sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1474 : 0 : return 1;
1475 : : case Opt_i_version:
1476 : 0 : sb->s_flags |= MS_I_VERSION;
1477 : 0 : return 1;
1478 : : }
1479 : :
1480 [ + - ]: 68 : for (m = ext4_mount_opts; m->token != Opt_err; m++)
1481 [ + + ]: 68 : if (token == m->token)
1482 : : break;
1483 : :
1484 [ - + ]: 4 : if (m->token == Opt_err) {
1485 : 0 : ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1486 : : "or missing value", opt);
1487 : 0 : return -1;
1488 : : }
1489 : :
1490 : : if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1491 : : ext4_msg(sb, KERN_ERR,
1492 : : "Mount option \"%s\" incompatible with ext2", opt);
1493 : : return -1;
1494 : : }
1495 : : if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1496 : : ext4_msg(sb, KERN_ERR,
1497 : : "Mount option \"%s\" incompatible with ext3", opt);
1498 : : return -1;
1499 : : }
1500 : :
1501 [ - + ][ # # ]: 4 : if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
[ # # ]
1502 : : return -1;
1503 [ - + ][ # # ]: 8 : if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
[ # # ]
1504 : : return -1;
1505 [ - + ]: 8 : if (m->flags & MOPT_EXPLICIT)
1506 : 0 : set_opt2(sb, EXPLICIT_DELALLOC);
1507 [ + + ]: 8 : if (m->flags & MOPT_CLEAR_ERR)
1508 : 4 : clear_opt(sb, ERRORS_MASK);
1509 [ - + ][ # # ]: 8 : if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1510 : 0 : ext4_msg(sb, KERN_ERR, "Cannot change quota "
1511 : : "options when quota turned on");
1512 : 0 : return -1;
1513 : : }
1514 : :
1515 [ - + ]: 8 : if (m->flags & MOPT_NOSUPPORT) {
1516 : 0 : ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1517 [ - + ]: 8 : } else if (token == Opt_commit) {
1518 [ # # ]: 0 : if (arg == 0)
1519 : 0 : arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1520 : 0 : sbi->s_commit_interval = HZ * arg;
1521 [ - + ]: 8 : } else if (token == Opt_max_batch_time) {
1522 [ # # ]: 0 : if (arg == 0)
1523 : 0 : arg = EXT4_DEF_MAX_BATCH_TIME;
1524 : 0 : sbi->s_max_batch_time = arg;
1525 [ - + ]: 8 : } else if (token == Opt_min_batch_time) {
1526 : 0 : sbi->s_min_batch_time = arg;
1527 [ - + ]: 8 : } else if (token == Opt_inode_readahead_blks) {
1528 [ # # ][ # # ]: 0 : if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
[ # # ]
1529 : 0 : ext4_msg(sb, KERN_ERR,
1530 : : "EXT4-fs: inode_readahead_blks must be "
1531 : : "0 or a power of 2 smaller than 2^31");
1532 : 0 : return -1;
1533 : : }
1534 : 0 : sbi->s_inode_readahead_blks = arg;
1535 [ - + ]: 8 : } else if (token == Opt_init_itable) {
1536 : 0 : set_opt(sb, INIT_INODE_TABLE);
1537 [ # # ]: 0 : if (!args->from)
1538 : 0 : arg = EXT4_DEF_LI_WAIT_MULT;
1539 : 0 : sbi->s_li_wait_mult = arg;
1540 [ - + ]: 8 : } else if (token == Opt_max_dir_size_kb) {
1541 : 0 : sbi->s_max_dir_size_kb = arg;
1542 [ - + ]: 4 : } else if (token == Opt_stripe) {
1543 : 0 : sbi->s_stripe = arg;
1544 [ - + ]: 4 : } else if (token == Opt_resuid) {
1545 : 0 : uid = make_kuid(current_user_ns(), arg);
1546 [ # # ]: 0 : if (!uid_valid(uid)) {
1547 : 0 : ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1548 : 0 : return -1;
1549 : : }
1550 : 0 : sbi->s_resuid = uid;
1551 [ - + ]: 4 : } else if (token == Opt_resgid) {
1552 : 0 : gid = make_kgid(current_user_ns(), arg);
1553 [ # # ]: 0 : if (!gid_valid(gid)) {
1554 : 0 : ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1555 : 0 : return -1;
1556 : : }
1557 : 0 : sbi->s_resgid = gid;
1558 [ - + ]: 4 : } else if (token == Opt_journal_dev) {
1559 [ # # ]: 0 : if (is_remount) {
1560 : 0 : ext4_msg(sb, KERN_ERR,
1561 : : "Cannot specify journal on remount");
1562 : 0 : return -1;
1563 : : }
1564 : 0 : *journal_devnum = arg;
1565 [ - + ]: 4 : } else if (token == Opt_journal_path) {
1566 : : char *journal_path;
1567 : : struct inode *journal_inode;
1568 : : struct path path;
1569 : : int error;
1570 : :
1571 [ # # ]: 0 : if (is_remount) {
1572 : 0 : ext4_msg(sb, KERN_ERR,
1573 : : "Cannot specify journal on remount");
1574 : 0 : return -1;
1575 : : }
1576 : 0 : journal_path = match_strdup(&args[0]);
1577 [ # # ]: 0 : if (!journal_path) {
1578 : 0 : ext4_msg(sb, KERN_ERR, "error: could not dup "
1579 : : "journal device string");
1580 : 0 : return -1;
1581 : : }
1582 : :
1583 : 0 : error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1584 [ # # ]: 0 : if (error) {
1585 : 0 : ext4_msg(sb, KERN_ERR, "error: could not find "
1586 : : "journal device path: error %d", error);
1587 : 0 : kfree(journal_path);
1588 : 0 : return -1;
1589 : : }
1590 : :
1591 : 0 : journal_inode = path.dentry->d_inode;
1592 [ # # ]: 0 : if (!S_ISBLK(journal_inode->i_mode)) {
1593 : 0 : ext4_msg(sb, KERN_ERR, "error: journal path %s "
1594 : : "is not a block device", journal_path);
1595 : 0 : path_put(&path);
1596 : 0 : kfree(journal_path);
1597 : 0 : return -1;
1598 : : }
1599 : :
1600 : 0 : *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1601 : 0 : path_put(&path);
1602 : 0 : kfree(journal_path);
1603 [ - + ]: 4 : } else if (token == Opt_journal_ioprio) {
1604 [ # # ]: 0 : if (arg > 7) {
1605 : 0 : ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1606 : : " (must be 0-7)");
1607 : 0 : return -1;
1608 : : }
1609 : 0 : *journal_ioprio =
1610 : 0 : IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1611 [ - + ]: 4 : } else if (m->flags & MOPT_DATAJ) {
1612 [ # # ]: 0 : if (is_remount) {
1613 [ # # ]: 0 : if (!sbi->s_journal)
1614 : 0 : ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1615 [ # # ]: 0 : else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1616 : 0 : ext4_msg(sb, KERN_ERR,
1617 : : "Cannot change data mode on remount");
1618 : 0 : return -1;
1619 : : }
1620 : : } else {
1621 : 0 : clear_opt(sb, DATA_FLAGS);
1622 : 0 : sbi->s_mount_opt |= m->mount_opt;
1623 : : }
1624 : : #ifdef CONFIG_QUOTA
1625 [ - + ]: 4 : } else if (m->flags & MOPT_QFMT) {
1626 [ # # ][ # # ]: 0 : if (sb_any_quota_loaded(sb) &&
1627 : 0 : sbi->s_jquota_fmt != m->mount_opt) {
1628 : 0 : ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1629 : : "quota options when quota turned on");
1630 : 0 : return -1;
1631 : : }
1632 [ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1633 : : EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1634 : 0 : ext4_msg(sb, KERN_ERR,
1635 : : "Cannot set journaled quota options "
1636 : : "when QUOTA feature is enabled");
1637 : 0 : return -1;
1638 : : }
1639 : 0 : sbi->s_jquota_fmt = m->mount_opt;
1640 : : #endif
1641 : : } else {
1642 [ + - ]: 4 : if (!args->from)
1643 : 4 : arg = 1;
1644 [ - + ]: 4 : if (m->flags & MOPT_CLEAR)
1645 : 0 : arg = !arg;
1646 [ - + ]: 4 : else if (unlikely(!(m->flags & MOPT_SET))) {
1647 : 0 : ext4_msg(sb, KERN_WARNING,
1648 : : "buggy handling of option %s", opt);
1649 : 0 : WARN_ON(1);
1650 : 0 : return -1;
1651 : : }
1652 [ + - ]: 4 : if (arg != 0)
1653 : 4 : sbi->s_mount_opt |= m->mount_opt;
1654 : : else
1655 : 0 : sbi->s_mount_opt &= ~m->mount_opt;
1656 : : }
1657 : : return 1;
1658 : : }
1659 : :
1660 : 0 : static int parse_options(char *options, struct super_block *sb,
1661 : : unsigned long *journal_devnum,
1662 : : unsigned int *journal_ioprio,
1663 : : int is_remount)
1664 : : {
1665 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1666 : : char *p;
1667 : : substring_t args[MAX_OPT_ARGS];
1668 : : int token;
1669 : :
1670 [ + - ]: 4 : if (!options)
1671 : : return 1;
1672 : :
1673 [ + + ]: 8 : while ((p = strsep(&options, ",")) != NULL) {
1674 [ - + ]: 4 : if (!*p)
1675 : 0 : continue;
1676 : : /*
1677 : : * Initialize args struct so we know whether arg was
1678 : : * found; some options take optional arguments.
1679 : : */
1680 : 4 : args[0].to = args[0].from = NULL;
1681 : 4 : token = match_token(p, tokens, args);
1682 [ + - ]: 4 : if (handle_mount_opt(sb, p, token, args, journal_devnum,
1683 : : journal_ioprio, is_remount) < 0)
1684 : : return 0;
1685 : : }
1686 : : #ifdef CONFIG_QUOTA
1687 [ - + ][ # # ]: 4 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1688 [ # # ]: 0 : (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1689 : 0 : ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1690 : : "feature is enabled");
1691 : 0 : return 0;
1692 : : }
1693 [ + - ][ - + ]: 4 : if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1694 [ # # ][ # # ]: 0 : if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1695 : 0 : clear_opt(sb, USRQUOTA);
1696 : :
1697 [ # # ][ # # ]: 0 : if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1698 : 0 : clear_opt(sb, GRPQUOTA);
1699 : :
1700 [ # # ][ # # ]: 0 : if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1701 : 0 : ext4_msg(sb, KERN_ERR, "old and new quota "
1702 : : "format mixing");
1703 : 0 : return 0;
1704 : : }
1705 : :
1706 [ # # ]: 0 : if (!sbi->s_jquota_fmt) {
1707 : 0 : ext4_msg(sb, KERN_ERR, "journaled quota format "
1708 : : "not specified");
1709 : 0 : return 0;
1710 : : }
1711 : : } else {
1712 [ - + ]: 4 : if (sbi->s_jquota_fmt) {
1713 : 0 : ext4_msg(sb, KERN_ERR, "journaled quota format "
1714 : : "specified with no journaling "
1715 : : "enabled");
1716 : 0 : return 0;
1717 : : }
1718 : : }
1719 : : #endif
1720 [ - + ]: 4 : if (test_opt(sb, DIOREAD_NOLOCK)) {
1721 : 0 : int blocksize =
1722 : 0 : BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1723 : :
1724 [ # # ]: 0 : if (blocksize < PAGE_CACHE_SIZE) {
1725 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
1726 : : "dioread_nolock if block size != PAGE_SIZE");
1727 : 0 : return 0;
1728 : : }
1729 : : }
1730 : : return 1;
1731 : : }
1732 : :
1733 : : static inline void ext4_show_quota_options(struct seq_file *seq,
1734 : 186 : struct super_block *sb)
1735 : : {
1736 : : #if defined(CONFIG_QUOTA)
1737 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1738 : :
1739 [ - + ]: 186 : if (sbi->s_jquota_fmt) {
1740 : : char *fmtname = "";
1741 : :
1742 [ # # ]: 0 : switch (sbi->s_jquota_fmt) {
1743 : : case QFMT_VFS_OLD:
1744 : : fmtname = "vfsold";
1745 : : break;
1746 : : case QFMT_VFS_V0:
1747 : : fmtname = "vfsv0";
1748 : : break;
1749 : : case QFMT_VFS_V1:
1750 : : fmtname = "vfsv1";
1751 : : break;
1752 : : }
1753 : 0 : seq_printf(seq, ",jqfmt=%s", fmtname);
1754 : : }
1755 : :
1756 [ - + ]: 186 : if (sbi->s_qf_names[USRQUOTA])
1757 : 0 : seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1758 : :
1759 [ - + ]: 186 : if (sbi->s_qf_names[GRPQUOTA])
1760 : 0 : seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1761 : : #endif
1762 : : }
1763 : :
1764 : 0 : static const char *token2str(int token)
1765 : : {
1766 : : const struct match_token *t;
1767 : :
1768 [ + - ]: 121 : for (t = tokens; t->token != Opt_err; t++)
1769 [ + + ][ + + ]: 121 : if (t->token == token && !strchr(t->pattern, '='))
1770 : : break;
1771 : 0 : return t->pattern;
1772 : : }
1773 : :
1774 : : /*
1775 : : * Show an option if
1776 : : * - it's set to a non-default value OR
1777 : : * - if the per-sb default is different from the global default
1778 : : */
1779 : 0 : static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1780 : : int nodefs)
1781 : : {
1782 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1783 : 186 : struct ext4_super_block *es = sbi->s_es;
1784 [ + + ]: 186 : int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1785 : : const struct mount_opts *m;
1786 [ + + ]: 186 : char sep = nodefs ? '\n' : ',';
1787 : :
1788 : : #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1789 : : #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1790 : :
1791 [ - + ]: 186 : if (sbi->s_sb_block != 1)
1792 : 186 : SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1793 : :
1794 [ + + ]: 10788 : for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1795 : 10602 : int want_set = m->flags & MOPT_SET;
1796 [ + + ][ + + ]: 10602 : if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1797 : 6138 : (m->flags & MOPT_CLEAR_ERR))
1798 : 5022 : continue;
1799 [ + + ]: 5580 : if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1800 : 5573 : continue; /* skip if same as the default */
1801 [ + + ][ + - ]: 7 : if ((want_set &&
1802 [ + + ]: 7 : (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1803 [ + - ]: 4 : (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1804 : 4 : continue; /* select Opt_noFoo vs Opt_Foo */
1805 : 3 : SEQ_OPTS_PRINT("%s", token2str(m->token));
1806 : : }
1807 : :
1808 [ + + ][ + - ]: 186 : if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
[ - + ]
1809 : 185 : le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1810 : 0 : SEQ_OPTS_PRINT("resuid=%u",
1811 : : from_kuid_munged(&init_user_ns, sbi->s_resuid));
1812 [ + + ][ + - ]: 186 : if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
[ - + ]
1813 : 185 : le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1814 : 1 : SEQ_OPTS_PRINT("resgid=%u",
1815 : : from_kgid_munged(&init_user_ns, sbi->s_resgid));
1816 [ + + ]: 186 : def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1817 [ + - ][ + - ]: 186 : if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1818 : 186 : SEQ_OPTS_PUTS("errors=remount-ro");
1819 [ - + ][ # # ]: 186 : if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1820 : 0 : SEQ_OPTS_PUTS("errors=continue");
1821 [ - + ][ # # ]: 186 : if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1822 : 0 : SEQ_OPTS_PUTS("errors=panic");
1823 [ + + ][ - + ]: 186 : if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1824 : 1 : SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1825 [ + + ][ - + ]: 186 : if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1826 : 1 : SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1827 [ + + ][ - + ]: 186 : if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1828 : 1 : SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1829 [ - + ]: 186 : if (sb->s_flags & MS_I_VERSION)
1830 : 0 : SEQ_OPTS_PUTS("i_version");
1831 [ + + ][ - + ]: 186 : if (nodefs || sbi->s_stripe)
1832 : 1 : SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1833 [ + - ]: 186 : if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1834 [ - + ]: 186 : if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1835 : 0 : SEQ_OPTS_PUTS("data=journal");
1836 [ + - ]: 186 : else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1837 : 186 : SEQ_OPTS_PUTS("data=ordered");
1838 [ # # ]: 0 : else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1839 : 0 : SEQ_OPTS_PUTS("data=writeback");
1840 : : }
1841 [ + + ][ - + ]: 186 : if (nodefs ||
1842 : 185 : sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1843 : 1 : SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1844 : : sbi->s_inode_readahead_blks);
1845 : :
1846 [ + + ][ + - ]: 186 : if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
[ - + ]
1847 : 185 : (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1848 : 1 : SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1849 [ + + ][ - + ]: 186 : if (nodefs || sbi->s_max_dir_size_kb)
1850 : 1 : SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1851 : :
1852 : : ext4_show_quota_options(seq, sb);
1853 : 186 : return 0;
1854 : : }
1855 : :
1856 : 0 : static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1857 : : {
1858 : 185 : return _ext4_show_options(seq, root->d_sb, 0);
1859 : : }
1860 : :
1861 : 0 : static int options_seq_show(struct seq_file *seq, void *offset)
1862 : : {
1863 : 1 : struct super_block *sb = seq->private;
1864 : : int rc;
1865 : :
1866 [ + - ]: 1 : seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1867 : 1 : rc = _ext4_show_options(seq, sb, 1);
1868 : 1 : seq_puts(seq, "\n");
1869 : 1 : return rc;
1870 : : }
1871 : :
1872 : 0 : static int options_open_fs(struct inode *inode, struct file *file)
1873 : : {
1874 : 1 : return single_open(file, options_seq_show, PDE_DATA(inode));
1875 : : }
1876 : :
1877 : : static const struct file_operations ext4_seq_options_fops = {
1878 : : .owner = THIS_MODULE,
1879 : : .open = options_open_fs,
1880 : : .read = seq_read,
1881 : : .llseek = seq_lseek,
1882 : : .release = single_release,
1883 : : };
1884 : :
1885 : 0 : static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1886 : : int read_only)
1887 : : {
1888 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1889 : : int res = 0;
1890 : :
1891 [ # # ]: 0 : if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1892 : 0 : ext4_msg(sb, KERN_ERR, "revision level too high, "
1893 : : "forcing read-only mode");
1894 : : res = MS_RDONLY;
1895 : : }
1896 [ # # ]: 0 : if (read_only)
1897 : : goto done;
1898 [ # # ]: 0 : if (!(sbi->s_mount_state & EXT4_VALID_FS))
1899 : 0 : ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1900 : : "running e2fsck is recommended");
1901 [ # # ]: 0 : else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1902 : 0 : ext4_msg(sb, KERN_WARNING,
1903 : : "warning: mounting fs with errors, "
1904 : : "running e2fsck is recommended");
1905 [ # # ][ # # ]: 0 : else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1906 : 0 : le16_to_cpu(es->s_mnt_count) >=
1907 : : (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1908 : 0 : ext4_msg(sb, KERN_WARNING,
1909 : : "warning: maximal mount count reached, "
1910 : : "running e2fsck is recommended");
1911 [ # # # # ]: 0 : else if (le32_to_cpu(es->s_checkinterval) &&
1912 : 0 : (le32_to_cpu(es->s_lastcheck) +
1913 : 0 : le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1914 : 0 : ext4_msg(sb, KERN_WARNING,
1915 : : "warning: checktime reached, "
1916 : : "running e2fsck is recommended");
1917 [ # # ]: 0 : if (!sbi->s_journal)
1918 : 0 : es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1919 [ # # ]: 0 : if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1920 : 0 : es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1921 : : le16_add_cpu(&es->s_mnt_count, 1);
1922 : 0 : es->s_mtime = cpu_to_le32(get_seconds());
1923 : 0 : ext4_update_dynamic_rev(sb);
1924 [ # # ]: 0 : if (sbi->s_journal)
1925 : 0 : EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1926 : :
1927 : 0 : ext4_commit_super(sb, 1);
1928 : : done:
1929 [ # # ]: 0 : if (test_opt(sb, DEBUG))
1930 : 0 : printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1931 : : "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1932 : : sb->s_blocksize,
1933 : : sbi->s_groups_count,
1934 : : EXT4_BLOCKS_PER_GROUP(sb),
1935 : : EXT4_INODES_PER_GROUP(sb),
1936 : : sbi->s_mount_opt, sbi->s_mount_opt2);
1937 : :
1938 : : cleancache_init_fs(sb);
1939 : 0 : return res;
1940 : : }
1941 : :
1942 : 0 : int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1943 : : {
1944 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1945 : : struct flex_groups *new_groups;
1946 : : int size;
1947 : :
1948 [ # # ]: 0 : if (!sbi->s_log_groups_per_flex)
1949 : : return 0;
1950 : :
1951 : 0 : size = ext4_flex_group(sbi, ngroup - 1) + 1;
1952 [ # # ]: 0 : if (size <= sbi->s_flex_groups_allocated)
1953 : : return 0;
1954 : :
1955 [ # # ][ # # ]: 0 : size = roundup_pow_of_two(size * sizeof(struct flex_groups));
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
1956 : 0 : new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1957 [ # # ]: 0 : if (!new_groups) {
1958 : 0 : ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1959 : : size / (int) sizeof(struct flex_groups));
1960 : 0 : return -ENOMEM;
1961 : : }
1962 : :
1963 [ # # ]: 0 : if (sbi->s_flex_groups) {
1964 : 0 : memcpy(new_groups, sbi->s_flex_groups,
1965 : 0 : (sbi->s_flex_groups_allocated *
1966 : : sizeof(struct flex_groups)));
1967 : 0 : ext4_kvfree(sbi->s_flex_groups);
1968 : : }
1969 : 0 : sbi->s_flex_groups = new_groups;
1970 : 0 : sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1971 : 0 : return 0;
1972 : : }
1973 : :
1974 : 0 : static int ext4_fill_flex_info(struct super_block *sb)
1975 : : {
1976 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1977 : : struct ext4_group_desc *gdp = NULL;
1978 : : ext4_group_t flex_group;
1979 : : int i, err;
1980 : :
1981 : 0 : sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1982 [ # # ]: 0 : if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1983 : 0 : sbi->s_log_groups_per_flex = 0;
1984 : 0 : return 1;
1985 : : }
1986 : :
1987 : 0 : err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1988 [ # # ]: 0 : if (err)
1989 : : goto failed;
1990 : :
1991 [ # # ]: 0 : for (i = 0; i < sbi->s_groups_count; i++) {
1992 : 0 : gdp = ext4_get_group_desc(sb, i, NULL);
1993 : :
1994 : : flex_group = ext4_flex_group(sbi, i);
1995 : 0 : atomic_add(ext4_free_inodes_count(sb, gdp),
1996 : 0 : &sbi->s_flex_groups[flex_group].free_inodes);
1997 : 0 : atomic64_add(ext4_free_group_clusters(sb, gdp),
1998 : 0 : &sbi->s_flex_groups[flex_group].free_clusters);
1999 : 0 : atomic_add(ext4_used_dirs_count(sb, gdp),
2000 : 0 : &sbi->s_flex_groups[flex_group].used_dirs);
2001 : : }
2002 : :
2003 : : return 1;
2004 : : failed:
2005 : : return 0;
2006 : : }
2007 : :
2008 : 0 : static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2009 : : struct ext4_group_desc *gdp)
2010 : : {
2011 : : int offset;
2012 : : __u16 crc = 0;
2013 : 1268766 : __le32 le_group = cpu_to_le32(block_group);
2014 : :
2015 [ - + ]: 1268766 : if ((sbi->s_es->s_feature_ro_compat &
2016 : : cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
2017 : : /* Use new metadata_csum algorithm */
2018 : : __le16 save_csum;
2019 : : __u32 csum32;
2020 : :
2021 : 0 : save_csum = gdp->bg_checksum;
2022 : 0 : gdp->bg_checksum = 0;
2023 : 0 : csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2024 : : sizeof(le_group));
2025 : : csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2026 : 0 : sbi->s_desc_size);
2027 : 0 : gdp->bg_checksum = save_csum;
2028 : :
2029 : 0 : crc = csum32 & 0xFFFF;
2030 : 0 : goto out;
2031 : : }
2032 : :
2033 : : /* old crc16 code */
2034 : : offset = offsetof(struct ext4_group_desc, bg_checksum);
2035 : :
2036 : 1268766 : crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2037 : 1268767 : crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2038 : 1268772 : crc = crc16(crc, (__u8 *)gdp, offset);
2039 : : offset += sizeof(gdp->bg_checksum); /* skip checksum */
2040 : : /* for checksum of struct ext4_group_desc do the rest...*/
2041 [ - + ]: 1268762 : if ((sbi->s_es->s_feature_incompat &
2042 [ # # ]: 0 : cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2043 : 0 : offset < le16_to_cpu(sbi->s_es->s_desc_size))
2044 : 0 : crc = crc16(crc, (__u8 *)gdp + offset,
2045 : 0 : le16_to_cpu(sbi->s_es->s_desc_size) -
2046 : : offset);
2047 : :
2048 : : out:
2049 : 1268762 : return cpu_to_le16(crc);
2050 : : }
2051 : :
2052 : 0 : int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2053 : : struct ext4_group_desc *gdp)
2054 : : {
2055 [ + - + - ]: 172 : if (ext4_has_group_desc_csum(sb) &&
2056 : 86 : (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2057 : : block_group, gdp)))
2058 : : return 0;
2059 : :
2060 : : return 1;
2061 : : }
2062 : :
2063 : 0 : void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2064 : : struct ext4_group_desc *gdp)
2065 : : {
2066 [ + + ]: 1268683 : if (!ext4_has_group_desc_csum(sb))
2067 : 1 : return;
2068 : 1268678 : gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2069 : : }
2070 : :
2071 : : /* Called at mount-time, super-block is locked */
2072 : 0 : static int ext4_check_descriptors(struct super_block *sb,
2073 : : ext4_group_t *first_not_zeroed)
2074 : : {
2075 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2076 : 0 : ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2077 : : ext4_fsblk_t last_block;
2078 : : ext4_fsblk_t block_bitmap;
2079 : : ext4_fsblk_t inode_bitmap;
2080 : : ext4_fsblk_t inode_table;
2081 : : int flexbg_flag = 0;
2082 : 0 : ext4_group_t i, grp = sbi->s_groups_count;
2083 : :
2084 [ # # ]: 0 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2085 : : flexbg_flag = 1;
2086 : :
2087 : : ext4_debug("Checking group descriptors");
2088 : :
2089 [ # # ]: 0 : for (i = 0; i < sbi->s_groups_count; i++) {
2090 : 0 : struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2091 : :
2092 [ # # ][ # # ]: 0 : if (i == sbi->s_groups_count - 1 || flexbg_flag)
2093 : 0 : last_block = ext4_blocks_count(sbi->s_es) - 1;
2094 : : else
2095 : 0 : last_block = first_block +
2096 : 0 : (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2097 : :
2098 [ # # ][ # # ]: 0 : if ((grp == sbi->s_groups_count) &&
2099 : 0 : !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2100 : : grp = i;
2101 : :
2102 : : block_bitmap = ext4_block_bitmap(sb, gdp);
2103 [ # # ]: 0 : if (block_bitmap < first_block || block_bitmap > last_block) {
2104 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2105 : : "Block bitmap for group %u not in group "
2106 : : "(block %llu)!", i, block_bitmap);
2107 : 0 : return 0;
2108 : : }
2109 : : inode_bitmap = ext4_inode_bitmap(sb, gdp);
2110 [ # # ]: 0 : if (inode_bitmap < first_block || inode_bitmap > last_block) {
2111 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2112 : : "Inode bitmap for group %u not in group "
2113 : : "(block %llu)!", i, inode_bitmap);
2114 : 0 : return 0;
2115 : : }
2116 : : inode_table = ext4_inode_table(sb, gdp);
2117 [ # # ][ # # ]: 0 : if (inode_table < first_block ||
2118 : 0 : inode_table + sbi->s_itb_per_group - 1 > last_block) {
2119 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2120 : : "Inode table for group %u not in group "
2121 : : "(block %llu)!", i, inode_table);
2122 : 0 : return 0;
2123 : : }
2124 : : ext4_lock_group(sb, i);
2125 [ # # ]: 0 : if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2126 : 0 : ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2127 : : "Checksum for group %u failed (%u!=%u)",
2128 : : i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2129 : : gdp)), le16_to_cpu(gdp->bg_checksum));
2130 [ # # ]: 0 : if (!(sb->s_flags & MS_RDONLY)) {
2131 : : ext4_unlock_group(sb, i);
2132 : 0 : return 0;
2133 : : }
2134 : : }
2135 : : ext4_unlock_group(sb, i);
2136 [ # # ]: 0 : if (!flexbg_flag)
2137 : 0 : first_block += EXT4_BLOCKS_PER_GROUP(sb);
2138 : : }
2139 [ # # ]: 0 : if (NULL != first_not_zeroed)
2140 : 0 : *first_not_zeroed = grp;
2141 : :
2142 : 0 : ext4_free_blocks_count_set(sbi->s_es,
2143 : 0 : EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2144 : 0 : sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2145 : 0 : return 1;
2146 : : }
2147 : :
2148 : : /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2149 : : * the superblock) which were deleted from all directories, but held open by
2150 : : * a process at the time of a crash. We walk the list and try to delete these
2151 : : * inodes at recovery time (only with a read-write filesystem).
2152 : : *
2153 : : * In order to keep the orphan inode chain consistent during traversal (in
2154 : : * case of crash during recovery), we link each inode into the superblock
2155 : : * orphan list_head and handle it the same way as an inode deletion during
2156 : : * normal operation (which journals the operations for us).
2157 : : *
2158 : : * We only do an iget() and an iput() on each inode, which is very safe if we
2159 : : * accidentally point at an in-use or already deleted inode. The worst that
2160 : : * can happen in this case is that we get a "bit already cleared" message from
2161 : : * ext4_free_inode(). The only reason we would point at a wrong inode is if
2162 : : * e2fsck was run on this filesystem, and it must have already done the orphan
2163 : : * inode cleanup for us, so we can safely abort without any further action.
2164 : : */
2165 : 0 : static void ext4_orphan_cleanup(struct super_block *sb,
2166 : : struct ext4_super_block *es)
2167 : : {
2168 : 0 : unsigned int s_flags = sb->s_flags;
2169 : : int nr_orphans = 0, nr_truncates = 0;
2170 : : #ifdef CONFIG_QUOTA
2171 : : int i;
2172 : : #endif
2173 [ # # ]: 0 : if (!es->s_last_orphan) {
2174 : : jbd_debug(4, "no orphan inodes to clean up\n");
2175 : : return;
2176 : : }
2177 : :
2178 [ # # ]: 0 : if (bdev_read_only(sb->s_bdev)) {
2179 : 0 : ext4_msg(sb, KERN_ERR, "write access "
2180 : : "unavailable, skipping orphan cleanup");
2181 : : return;
2182 : : }
2183 : :
2184 : : /* Check if feature set would not allow a r/w mount */
2185 [ # # ]: 0 : if (!ext4_feature_set_ok(sb, 0)) {
2186 : 0 : ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2187 : : "unknown ROCOMPAT features");
2188 : : return;
2189 : : }
2190 : :
2191 [ # # ]: 0 : if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2192 : : /* don't clear list on RO mount w/ errors */
2193 [ # # ][ # # ]: 0 : if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2194 : : jbd_debug(1, "Errors on filesystem, "
2195 : : "clearing orphan list.\n");
2196 : 0 : es->s_last_orphan = 0;
2197 : : }
2198 : : jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2199 : : return;
2200 : : }
2201 : :
2202 [ # # ]: 0 : if (s_flags & MS_RDONLY) {
2203 : 0 : ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2204 : 0 : sb->s_flags &= ~MS_RDONLY;
2205 : : }
2206 : : #ifdef CONFIG_QUOTA
2207 : : /* Needed for iput() to work correctly and not trash data */
2208 : 0 : sb->s_flags |= MS_ACTIVE;
2209 : : /* Turn on quotas so that they are updated correctly */
2210 [ # # ]: 0 : for (i = 0; i < MAXQUOTAS; i++) {
2211 [ # # ]: 0 : if (EXT4_SB(sb)->s_qf_names[i]) {
2212 : : int ret = ext4_quota_on_mount(sb, i);
2213 [ # # ]: 0 : if (ret < 0)
2214 : 0 : ext4_msg(sb, KERN_ERR,
2215 : : "Cannot turn on journaled "
2216 : : "quota: error %d", ret);
2217 : : }
2218 : : }
2219 : : #endif
2220 : :
2221 [ # # ]: 0 : while (es->s_last_orphan) {
2222 : : struct inode *inode;
2223 : :
2224 : 0 : inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2225 [ # # ]: 0 : if (IS_ERR(inode)) {
2226 : 0 : es->s_last_orphan = 0;
2227 : : break;
2228 : : }
2229 : :
2230 : 0 : list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2231 : 0 : dquot_initialize(inode);
2232 [ # # ]: 0 : if (inode->i_nlink) {
2233 [ # # ]: 0 : if (test_opt(sb, DEBUG))
2234 : 0 : ext4_msg(sb, KERN_DEBUG,
2235 : : "%s: truncating inode %lu to %lld bytes",
2236 : : __func__, inode->i_ino, inode->i_size);
2237 : : jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2238 : : inode->i_ino, inode->i_size);
2239 : 0 : mutex_lock(&inode->i_mutex);
2240 : 0 : truncate_inode_pages(inode->i_mapping, inode->i_size);
2241 : 0 : ext4_truncate(inode);
2242 : 0 : mutex_unlock(&inode->i_mutex);
2243 : 0 : nr_truncates++;
2244 : : } else {
2245 [ # # ]: 0 : if (test_opt(sb, DEBUG))
2246 : 0 : ext4_msg(sb, KERN_DEBUG,
2247 : : "%s: deleting unreferenced inode %lu",
2248 : : __func__, inode->i_ino);
2249 : : jbd_debug(2, "deleting unreferenced inode %lu\n",
2250 : : inode->i_ino);
2251 : 0 : nr_orphans++;
2252 : : }
2253 : 0 : iput(inode); /* The delete magic happens here! */
2254 : : }
2255 : :
2256 : : #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2257 : :
2258 [ # # ]: 0 : if (nr_orphans)
2259 [ # # ]: 0 : ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2260 : : PLURAL(nr_orphans));
2261 [ # # ]: 0 : if (nr_truncates)
2262 [ # # ]: 0 : ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2263 : : PLURAL(nr_truncates));
2264 : : #ifdef CONFIG_QUOTA
2265 : : /* Turn quotas off */
2266 [ # # ]: 0 : for (i = 0; i < MAXQUOTAS; i++) {
2267 [ # # ]: 0 : if (sb_dqopt(sb)->files[i])
2268 : 0 : dquot_quota_off(sb, i);
2269 : : }
2270 : : #endif
2271 : 0 : sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2272 : : }
2273 : :
2274 : : /*
2275 : : * Maximal extent format file size.
2276 : : * Resulting logical blkno at s_maxbytes must fit in our on-disk
2277 : : * extent format containers, within a sector_t, and within i_blocks
2278 : : * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2279 : : * so that won't be a limiting factor.
2280 : : *
2281 : : * However there is other limiting factor. We do store extents in the form
2282 : : * of starting block and length, hence the resulting length of the extent
2283 : : * covering maximum file size must fit into on-disk format containers as
2284 : : * well. Given that length is always by 1 unit bigger than max unit (because
2285 : : * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2286 : : *
2287 : : * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2288 : : */
2289 : : static loff_t ext4_max_size(int blkbits, int has_huge_files)
2290 : : {
2291 : : loff_t res;
2292 : : loff_t upper_limit = MAX_LFS_FILESIZE;
2293 : :
2294 : : /* small i_blocks in vfs inode? */
2295 [ # # ]: 0 : if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2296 : : /*
2297 : : * CONFIG_LBDAF is not enabled implies the inode
2298 : : * i_block represent total blocks in 512 bytes
2299 : : * 32 == size of vfs inode i_blocks * 8
2300 : : */
2301 : : upper_limit = (1LL << 32) - 1;
2302 : :
2303 : : /* total blocks in file system block size */
2304 : 0 : upper_limit >>= (blkbits - 9);
2305 : 0 : upper_limit <<= blkbits;
2306 : : }
2307 : :
2308 : : /*
2309 : : * 32-bit extent-start container, ee_block. We lower the maxbytes
2310 : : * by one fs block, so ee_len can cover the extent of maximum file
2311 : : * size
2312 : : */
2313 : : res = (1LL << 32) - 1;
2314 : 0 : res <<= blkbits;
2315 : :
2316 : : /* Sanity check against vm- & vfs- imposed limits */
2317 [ # # ]: 0 : if (res > upper_limit)
2318 : : res = upper_limit;
2319 : :
2320 : : return res;
2321 : : }
2322 : :
2323 : : /*
2324 : : * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2325 : : * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2326 : : * We need to be 1 filesystem block less than the 2^48 sector limit.
2327 : : */
2328 : 0 : static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2329 : : {
2330 : : loff_t res = EXT4_NDIR_BLOCKS;
2331 : : int meta_blocks;
2332 : : loff_t upper_limit;
2333 : : /* This is calculated to be the largest file size for a dense, block
2334 : : * mapped file such that the file's total number of 512-byte sectors,
2335 : : * including data and all indirect blocks, does not exceed (2^48 - 1).
2336 : : *
2337 : : * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2338 : : * number of 512-byte sectors of the file.
2339 : : */
2340 : :
2341 [ # # ]: 0 : if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2342 : : /*
2343 : : * !has_huge_files or CONFIG_LBDAF not enabled implies that
2344 : : * the inode i_block field represents total file blocks in
2345 : : * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2346 : : */
2347 : : upper_limit = (1LL << 32) - 1;
2348 : :
2349 : : /* total blocks in file system block size */
2350 : 0 : upper_limit >>= (bits - 9);
2351 : :
2352 : : } else {
2353 : : /*
2354 : : * We use 48 bit ext4_inode i_blocks
2355 : : * With EXT4_HUGE_FILE_FL set the i_blocks
2356 : : * represent total number of blocks in
2357 : : * file system block size
2358 : : */
2359 : : upper_limit = (1LL << 48) - 1;
2360 : :
2361 : : }
2362 : :
2363 : : /* indirect blocks */
2364 : : meta_blocks = 1;
2365 : : /* double indirect blocks */
2366 : 0 : meta_blocks += 1 + (1LL << (bits-2));
2367 : : /* tripple indirect blocks */
2368 : 0 : meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2369 : :
2370 : 0 : upper_limit -= meta_blocks;
2371 : 0 : upper_limit <<= bits;
2372 : :
2373 : 0 : res += 1LL << (bits-2);
2374 : 0 : res += 1LL << (2*(bits-2));
2375 : 0 : res += 1LL << (3*(bits-2));
2376 : 0 : res <<= bits;
2377 [ # # ]: 0 : if (res > upper_limit)
2378 : : res = upper_limit;
2379 : :
2380 [ # # ]: 0 : if (res > MAX_LFS_FILESIZE)
2381 : : res = MAX_LFS_FILESIZE;
2382 : :
2383 : 0 : return res;
2384 : : }
2385 : :
2386 : 0 : static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2387 : : ext4_fsblk_t logical_sb_block, int nr)
2388 : : {
2389 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
2390 : : ext4_group_t bg, first_meta_bg;
2391 : : int has_super = 0;
2392 : :
2393 : 0 : first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2394 : :
2395 [ # # ][ # # ]: 0 : if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2396 : 0 : nr < first_meta_bg)
2397 : 0 : return logical_sb_block + nr + 1;
2398 : 0 : bg = sbi->s_desc_per_block * nr;
2399 [ # # ]: 0 : if (ext4_bg_has_super(sb, bg))
2400 : : has_super = 1;
2401 : :
2402 : 0 : return (has_super + ext4_group_first_block_no(sb, bg));
2403 : : }
2404 : :
2405 : : /**
2406 : : * ext4_get_stripe_size: Get the stripe size.
2407 : : * @sbi: In memory super block info
2408 : : *
2409 : : * If we have specified it via mount option, then
2410 : : * use the mount option value. If the value specified at mount time is
2411 : : * greater than the blocks per group use the super block value.
2412 : : * If the super block value is greater than blocks per group return 0.
2413 : : * Allocator needs it be less than blocks per group.
2414 : : *
2415 : : */
2416 : : static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2417 : : {
2418 : 0 : unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2419 : 0 : unsigned long stripe_width =
2420 : : le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2421 : : int ret;
2422 : :
2423 [ # # ][ # # ]: 0 : if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2424 : 0 : ret = sbi->s_stripe;
2425 [ # # ]: 0 : else if (stripe_width <= sbi->s_blocks_per_group)
2426 : 0 : ret = stripe_width;
2427 [ # # ]: 0 : else if (stride <= sbi->s_blocks_per_group)
2428 : 0 : ret = stride;
2429 : : else
2430 : : ret = 0;
2431 : :
2432 : : /*
2433 : : * If the stripe width is 1, this makes no sense and
2434 : : * we set it to 0 to turn off stripe handling code.
2435 : : */
2436 [ # # ]: 0 : if (ret <= 1)
2437 : : ret = 0;
2438 : :
2439 : 0 : return ret;
2440 : : }
2441 : :
2442 : : /* sysfs supprt */
2443 : :
2444 : : struct ext4_attr {
2445 : : struct attribute attr;
2446 : : ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2447 : : ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2448 : : const char *, size_t);
2449 : : union {
2450 : : int offset;
2451 : : int deprecated_val;
2452 : : } u;
2453 : : };
2454 : :
2455 : 0 : static int parse_strtoull(const char *buf,
2456 : : unsigned long long max, unsigned long long *value)
2457 : : {
2458 : : int ret;
2459 : :
2460 : 0 : ret = kstrtoull(skip_spaces(buf), 0, value);
2461 [ # # ][ # # ]: 0 : if (!ret && *value > max)
2462 : : ret = -EINVAL;
2463 : 0 : return ret;
2464 : : }
2465 : :
2466 : 0 : static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2467 : : struct ext4_sb_info *sbi,
2468 : : char *buf)
2469 : : {
2470 : 0 : return snprintf(buf, PAGE_SIZE, "%llu\n",
2471 : 0 : (s64) EXT4_C2B(sbi,
2472 : : percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2473 : : }
2474 : :
2475 : 0 : static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2476 : : struct ext4_sb_info *sbi, char *buf)
2477 : : {
2478 : 0 : struct super_block *sb = sbi->s_buddy_cache->i_sb;
2479 : :
2480 [ # # ]: 0 : if (!sb->s_bdev->bd_part)
2481 : 0 : return snprintf(buf, PAGE_SIZE, "0\n");
2482 : 0 : return snprintf(buf, PAGE_SIZE, "%lu\n",
2483 [ # # ]: 0 : (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2484 : 0 : sbi->s_sectors_written_start) >> 1);
2485 : : }
2486 : :
2487 : 0 : static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2488 : : struct ext4_sb_info *sbi, char *buf)
2489 : : {
2490 : 0 : struct super_block *sb = sbi->s_buddy_cache->i_sb;
2491 : :
2492 [ # # ]: 0 : if (!sb->s_bdev->bd_part)
2493 : 0 : return snprintf(buf, PAGE_SIZE, "0\n");
2494 : 0 : return snprintf(buf, PAGE_SIZE, "%llu\n",
2495 : 0 : (unsigned long long)(sbi->s_kbytes_written +
2496 [ # # ]: 0 : ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2497 : 0 : EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2498 : : }
2499 : :
2500 : 0 : static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2501 : : struct ext4_sb_info *sbi,
2502 : : const char *buf, size_t count)
2503 : : {
2504 : : unsigned long t;
2505 : : int ret;
2506 : :
2507 : 0 : ret = kstrtoul(skip_spaces(buf), 0, &t);
2508 [ # # ]: 0 : if (ret)
2509 : : return ret;
2510 : :
2511 [ # # ][ # # ]: 0 : if (t && (!is_power_of_2(t) || t > 0x40000000))
[ # # ]
2512 : : return -EINVAL;
2513 : :
2514 : 0 : sbi->s_inode_readahead_blks = t;
2515 : 0 : return count;
2516 : : }
2517 : :
2518 : 0 : static ssize_t sbi_ui_show(struct ext4_attr *a,
2519 : : struct ext4_sb_info *sbi, char *buf)
2520 : : {
2521 : 0 : unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
2522 : :
2523 : 0 : return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2524 : : }
2525 : :
2526 : 0 : static ssize_t sbi_ui_store(struct ext4_attr *a,
2527 : : struct ext4_sb_info *sbi,
2528 : : const char *buf, size_t count)
2529 : : {
2530 : 0 : unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
2531 : : unsigned long t;
2532 : : int ret;
2533 : :
2534 : 0 : ret = kstrtoul(skip_spaces(buf), 0, &t);
2535 [ # # ]: 0 : if (ret)
2536 : : return ret;
2537 : 0 : *ui = t;
2538 : 0 : return count;
2539 : : }
2540 : :
2541 : 0 : static ssize_t reserved_clusters_show(struct ext4_attr *a,
2542 : : struct ext4_sb_info *sbi, char *buf)
2543 : : {
2544 : 0 : return snprintf(buf, PAGE_SIZE, "%llu\n",
2545 : 0 : (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2546 : : }
2547 : :
2548 : 0 : static ssize_t reserved_clusters_store(struct ext4_attr *a,
2549 : : struct ext4_sb_info *sbi,
2550 : : const char *buf, size_t count)
2551 : : {
2552 : : unsigned long long val;
2553 : : int ret;
2554 : :
2555 [ # # ]: 0 : if (parse_strtoull(buf, -1ULL, &val))
2556 : : return -EINVAL;
2557 : 0 : ret = ext4_reserve_clusters(sbi, val);
2558 : :
2559 [ # # ]: 0 : return ret ? ret : count;
2560 : : }
2561 : :
2562 : 0 : static ssize_t trigger_test_error(struct ext4_attr *a,
2563 : : struct ext4_sb_info *sbi,
2564 : : const char *buf, size_t count)
2565 : : {
2566 : 0 : int len = count;
2567 : :
2568 [ # # ]: 0 : if (!capable(CAP_SYS_ADMIN))
2569 : : return -EPERM;
2570 : :
2571 [ # # ][ # # ]: 0 : if (len && buf[len-1] == '\n')
2572 : 0 : len--;
2573 : :
2574 [ # # ]: 0 : if (len)
2575 : 0 : ext4_error(sbi->s_sb, "%.*s", len, buf);
2576 : 0 : return count;
2577 : : }
2578 : :
2579 : 0 : static ssize_t sbi_deprecated_show(struct ext4_attr *a,
2580 : : struct ext4_sb_info *sbi, char *buf)
2581 : : {
2582 : 0 : return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
2583 : : }
2584 : :
2585 : : #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2586 : : static struct ext4_attr ext4_attr_##_name = { \
2587 : : .attr = {.name = __stringify(_name), .mode = _mode }, \
2588 : : .show = _show, \
2589 : : .store = _store, \
2590 : : .u = { \
2591 : : .offset = offsetof(struct ext4_sb_info, _elname),\
2592 : : }, \
2593 : : }
2594 : : #define EXT4_ATTR(name, mode, show, store) \
2595 : : static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2596 : :
2597 : : #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2598 : : #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2599 : : #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2600 : : #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2601 : : EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2602 : : #define ATTR_LIST(name) &ext4_attr_##name.attr
2603 : : #define EXT4_DEPRECATED_ATTR(_name, _val) \
2604 : : static struct ext4_attr ext4_attr_##_name = { \
2605 : : .attr = {.name = __stringify(_name), .mode = 0444 }, \
2606 : : .show = sbi_deprecated_show, \
2607 : : .u = { \
2608 : : .deprecated_val = _val, \
2609 : : }, \
2610 : : }
2611 : :
2612 : : EXT4_RO_ATTR(delayed_allocation_blocks);
2613 : : EXT4_RO_ATTR(session_write_kbytes);
2614 : : EXT4_RO_ATTR(lifetime_write_kbytes);
2615 : : EXT4_RW_ATTR(reserved_clusters);
2616 : : EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2617 : : inode_readahead_blks_store, s_inode_readahead_blks);
2618 : : EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2619 : : EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2620 : : EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2621 : : EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2622 : : EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2623 : : EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2624 : : EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2625 : : EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
2626 : : EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2627 : : EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2628 : : EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2629 : : EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2630 : : EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2631 : : EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2632 : : EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2633 : : EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
2634 : :
2635 : : static struct attribute *ext4_attrs[] = {
2636 : : ATTR_LIST(delayed_allocation_blocks),
2637 : : ATTR_LIST(session_write_kbytes),
2638 : : ATTR_LIST(lifetime_write_kbytes),
2639 : : ATTR_LIST(reserved_clusters),
2640 : : ATTR_LIST(inode_readahead_blks),
2641 : : ATTR_LIST(inode_goal),
2642 : : ATTR_LIST(mb_stats),
2643 : : ATTR_LIST(mb_max_to_scan),
2644 : : ATTR_LIST(mb_min_to_scan),
2645 : : ATTR_LIST(mb_order2_req),
2646 : : ATTR_LIST(mb_stream_req),
2647 : : ATTR_LIST(mb_group_prealloc),
2648 : : ATTR_LIST(max_writeback_mb_bump),
2649 : : ATTR_LIST(extent_max_zeroout_kb),
2650 : : ATTR_LIST(trigger_fs_error),
2651 : : ATTR_LIST(err_ratelimit_interval_ms),
2652 : : ATTR_LIST(err_ratelimit_burst),
2653 : : ATTR_LIST(warning_ratelimit_interval_ms),
2654 : : ATTR_LIST(warning_ratelimit_burst),
2655 : : ATTR_LIST(msg_ratelimit_interval_ms),
2656 : : ATTR_LIST(msg_ratelimit_burst),
2657 : : NULL,
2658 : : };
2659 : :
2660 : : /* Features this copy of ext4 supports */
2661 : : EXT4_INFO_ATTR(lazy_itable_init);
2662 : : EXT4_INFO_ATTR(batched_discard);
2663 : : EXT4_INFO_ATTR(meta_bg_resize);
2664 : :
2665 : : static struct attribute *ext4_feat_attrs[] = {
2666 : : ATTR_LIST(lazy_itable_init),
2667 : : ATTR_LIST(batched_discard),
2668 : : ATTR_LIST(meta_bg_resize),
2669 : : NULL,
2670 : : };
2671 : :
2672 : 0 : static ssize_t ext4_attr_show(struct kobject *kobj,
2673 : : struct attribute *attr, char *buf)
2674 : : {
2675 : 0 : struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2676 : : s_kobj);
2677 : : struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2678 : :
2679 [ # # ]: 0 : return a->show ? a->show(a, sbi, buf) : 0;
2680 : : }
2681 : :
2682 : 0 : static ssize_t ext4_attr_store(struct kobject *kobj,
2683 : : struct attribute *attr,
2684 : : const char *buf, size_t len)
2685 : : {
2686 : 0 : struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2687 : : s_kobj);
2688 : : struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2689 : :
2690 [ # # ]: 0 : return a->store ? a->store(a, sbi, buf, len) : 0;
2691 : : }
2692 : :
2693 : 0 : static void ext4_sb_release(struct kobject *kobj)
2694 : : {
2695 : : struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2696 : : s_kobj);
2697 : 0 : complete(&sbi->s_kobj_unregister);
2698 : 0 : }
2699 : :
2700 : : static const struct sysfs_ops ext4_attr_ops = {
2701 : : .show = ext4_attr_show,
2702 : : .store = ext4_attr_store,
2703 : : };
2704 : :
2705 : : static struct kobj_type ext4_ktype = {
2706 : : .default_attrs = ext4_attrs,
2707 : : .sysfs_ops = &ext4_attr_ops,
2708 : : .release = ext4_sb_release,
2709 : : };
2710 : :
2711 : 0 : static void ext4_feat_release(struct kobject *kobj)
2712 : : {
2713 : 0 : complete(&ext4_feat->f_kobj_unregister);
2714 : 0 : }
2715 : :
2716 : : static struct kobj_type ext4_feat_ktype = {
2717 : : .default_attrs = ext4_feat_attrs,
2718 : : .sysfs_ops = &ext4_attr_ops,
2719 : : .release = ext4_feat_release,
2720 : : };
2721 : :
2722 : : /*
2723 : : * Check whether this filesystem can be mounted based on
2724 : : * the features present and the RDONLY/RDWR mount requested.
2725 : : * Returns 1 if this filesystem can be mounted as requested,
2726 : : * 0 if it cannot be.
2727 : : */
2728 : 0 : static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2729 : : {
2730 [ # # ]: 0 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2731 : 0 : ext4_msg(sb, KERN_ERR,
2732 : : "Couldn't mount because of "
2733 : : "unsupported optional features (%x)",
2734 : : (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2735 : : ~EXT4_FEATURE_INCOMPAT_SUPP));
2736 : 0 : return 0;
2737 : : }
2738 : :
2739 [ # # ]: 0 : if (readonly)
2740 : : return 1;
2741 : :
2742 : : /* Check that feature set is OK for a read-write mount */
2743 [ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2744 : 0 : ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2745 : : "unsupported optional features (%x)",
2746 : : (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2747 : : ~EXT4_FEATURE_RO_COMPAT_SUPP));
2748 : 0 : return 0;
2749 : : }
2750 : : /*
2751 : : * Large file size enabled file system can only be mounted
2752 : : * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2753 : : */
2754 : : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2755 : : if (sizeof(blkcnt_t) < sizeof(u64)) {
2756 : : ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2757 : : "cannot be mounted RDWR without "
2758 : : "CONFIG_LBDAF");
2759 : : return 0;
2760 : : }
2761 : : }
2762 [ # # ][ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2763 : 0 : !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2764 : 0 : ext4_msg(sb, KERN_ERR,
2765 : : "Can't support bigalloc feature without "
2766 : : "extents feature\n");
2767 : 0 : return 0;
2768 : : }
2769 : :
2770 : : #ifndef CONFIG_QUOTA
2771 : : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2772 : : !readonly) {
2773 : : ext4_msg(sb, KERN_ERR,
2774 : : "Filesystem with quota feature cannot be mounted RDWR "
2775 : : "without CONFIG_QUOTA");
2776 : : return 0;
2777 : : }
2778 : : #endif /* CONFIG_QUOTA */
2779 : : return 1;
2780 : : }
2781 : :
2782 : : /*
2783 : : * This function is called once a day if we have errors logged
2784 : : * on the file system
2785 : : */
2786 : 0 : static void print_daily_error_info(unsigned long arg)
2787 : : {
2788 : 0 : struct super_block *sb = (struct super_block *) arg;
2789 : : struct ext4_sb_info *sbi;
2790 : : struct ext4_super_block *es;
2791 : :
2792 : : sbi = EXT4_SB(sb);
2793 : 0 : es = sbi->s_es;
2794 : :
2795 [ # # ]: 0 : if (es->s_error_count)
2796 : 0 : ext4_msg(sb, KERN_NOTICE, "error count: %u",
2797 : : le32_to_cpu(es->s_error_count));
2798 [ # # ]: 0 : if (es->s_first_error_time) {
2799 : 0 : printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2800 : 0 : sb->s_id, le32_to_cpu(es->s_first_error_time),
2801 : : (int) sizeof(es->s_first_error_func),
2802 : 0 : es->s_first_error_func,
2803 : : le32_to_cpu(es->s_first_error_line));
2804 [ # # ]: 0 : if (es->s_first_error_ino)
2805 : 0 : printk(": inode %u",
2806 : : le32_to_cpu(es->s_first_error_ino));
2807 [ # # ]: 0 : if (es->s_first_error_block)
2808 : 0 : printk(": block %llu", (unsigned long long)
2809 : : le64_to_cpu(es->s_first_error_block));
2810 : 0 : printk("\n");
2811 : : }
2812 [ # # ]: 0 : if (es->s_last_error_time) {
2813 : 0 : printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2814 : 0 : sb->s_id, le32_to_cpu(es->s_last_error_time),
2815 : : (int) sizeof(es->s_last_error_func),
2816 : 0 : es->s_last_error_func,
2817 : : le32_to_cpu(es->s_last_error_line));
2818 [ # # ]: 0 : if (es->s_last_error_ino)
2819 : 0 : printk(": inode %u",
2820 : : le32_to_cpu(es->s_last_error_ino));
2821 [ # # ]: 0 : if (es->s_last_error_block)
2822 : 0 : printk(": block %llu", (unsigned long long)
2823 : : le64_to_cpu(es->s_last_error_block));
2824 : 0 : printk("\n");
2825 : : }
2826 : 0 : mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2827 : 0 : }
2828 : :
2829 : : /* Find next suitable group and run ext4_init_inode_table */
2830 : 0 : static int ext4_run_li_request(struct ext4_li_request *elr)
2831 : : {
2832 : : struct ext4_group_desc *gdp = NULL;
2833 : : ext4_group_t group, ngroups;
2834 : 0 : struct super_block *sb;
2835 : : unsigned long timeout = 0;
2836 : : int ret = 0;
2837 : :
2838 : 0 : sb = elr->lr_super;
2839 : 0 : ngroups = EXT4_SB(sb)->s_groups_count;
2840 : :
2841 : : sb_start_write(sb);
2842 [ # # ]: 0 : for (group = elr->lr_next_group; group < ngroups; group++) {
2843 : 0 : gdp = ext4_get_group_desc(sb, group, NULL);
2844 [ # # ]: 0 : if (!gdp) {
2845 : : ret = 1;
2846 : : break;
2847 : : }
2848 : :
2849 [ # # ]: 0 : if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2850 : : break;
2851 : : }
2852 : :
2853 [ # # ]: 0 : if (group >= ngroups)
2854 : : ret = 1;
2855 : :
2856 [ # # ]: 0 : if (!ret) {
2857 : 0 : timeout = jiffies;
2858 : 0 : ret = ext4_init_inode_table(sb, group,
2859 : 0 : elr->lr_timeout ? 0 : 1);
2860 [ # # ]: 0 : if (elr->lr_timeout == 0) {
2861 : 0 : timeout = (jiffies - timeout) *
2862 : 0 : elr->lr_sbi->s_li_wait_mult;
2863 : 0 : elr->lr_timeout = timeout;
2864 : : }
2865 : 0 : elr->lr_next_sched = jiffies + elr->lr_timeout;
2866 : 0 : elr->lr_next_group = group + 1;
2867 : : }
2868 : : sb_end_write(sb);
2869 : :
2870 : 0 : return ret;
2871 : : }
2872 : :
2873 : : /*
2874 : : * Remove lr_request from the list_request and free the
2875 : : * request structure. Should be called with li_list_mtx held
2876 : : */
2877 : 0 : static void ext4_remove_li_request(struct ext4_li_request *elr)
2878 : : {
2879 : : struct ext4_sb_info *sbi;
2880 : :
2881 [ # # ]: 0 : if (!elr)
2882 : 0 : return;
2883 : :
2884 : 0 : sbi = elr->lr_sbi;
2885 : :
2886 : : list_del(&elr->lr_request);
2887 : 0 : sbi->s_li_request = NULL;
2888 : 0 : kfree(elr);
2889 : : }
2890 : :
2891 : 0 : static void ext4_unregister_li_request(struct super_block *sb)
2892 : : {
2893 : 0 : mutex_lock(&ext4_li_mtx);
2894 [ # # ]: 0 : if (!ext4_li_info) {
2895 : 0 : mutex_unlock(&ext4_li_mtx);
2896 : 0 : return;
2897 : : }
2898 : :
2899 : 0 : mutex_lock(&ext4_li_info->li_list_mtx);
2900 : 0 : ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2901 : 0 : mutex_unlock(&ext4_li_info->li_list_mtx);
2902 : 0 : mutex_unlock(&ext4_li_mtx);
2903 : : }
2904 : :
2905 : : static struct task_struct *ext4_lazyinit_task;
2906 : :
2907 : : /*
2908 : : * This is the function where ext4lazyinit thread lives. It walks
2909 : : * through the request list searching for next scheduled filesystem.
2910 : : * When such a fs is found, run the lazy initialization request
2911 : : * (ext4_rn_li_request) and keep track of the time spend in this
2912 : : * function. Based on that time we compute next schedule time of
2913 : : * the request. When walking through the list is complete, compute
2914 : : * next waking time and put itself into sleep.
2915 : : */
2916 : 0 : static int ext4_lazyinit_thread(void *arg)
2917 : : {
2918 : : struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2919 : : struct list_head *pos, *n;
2920 : : struct ext4_li_request *elr;
2921 : : unsigned long next_wakeup, cur;
2922 : :
2923 [ # # ]: 0 : BUG_ON(NULL == eli);
2924 : :
2925 : : cont_thread:
2926 : : while (true) {
2927 : : next_wakeup = MAX_JIFFY_OFFSET;
2928 : :
2929 : 0 : mutex_lock(&eli->li_list_mtx);
2930 [ # # ]: 0 : if (list_empty(&eli->li_request_list)) {
2931 : 0 : mutex_unlock(&eli->li_list_mtx);
2932 : 0 : goto exit_thread;
2933 : : }
2934 : :
2935 [ # # ]: 0 : list_for_each_safe(pos, n, &eli->li_request_list) {
2936 : 0 : elr = list_entry(pos, struct ext4_li_request,
2937 : : lr_request);
2938 : :
2939 [ # # ]: 0 : if (time_after_eq(jiffies, elr->lr_next_sched)) {
2940 [ # # ]: 0 : if (ext4_run_li_request(elr) != 0) {
2941 : : /* error, remove the lazy_init job */
2942 : 0 : ext4_remove_li_request(elr);
2943 : 0 : continue;
2944 : : }
2945 : : }
2946 : :
2947 [ # # ]: 0 : if (time_before(elr->lr_next_sched, next_wakeup))
2948 : : next_wakeup = elr->lr_next_sched;
2949 : : }
2950 : 0 : mutex_unlock(&eli->li_list_mtx);
2951 : :
2952 : : try_to_freeze();
2953 : :
2954 : 0 : cur = jiffies;
2955 [ # # ][ # # ]: 0 : if ((time_after_eq(cur, next_wakeup)) ||
2956 : : (MAX_JIFFY_OFFSET == next_wakeup)) {
2957 : 0 : cond_resched();
2958 : 0 : continue;
2959 : : }
2960 : :
2961 : 0 : schedule_timeout_interruptible(next_wakeup - cur);
2962 : :
2963 [ # # ]: 0 : if (kthread_should_stop()) {
2964 : 0 : ext4_clear_request_list();
2965 : 0 : goto exit_thread;
2966 : : }
2967 : : }
2968 : :
2969 : : exit_thread:
2970 : : /*
2971 : : * It looks like the request list is empty, but we need
2972 : : * to check it under the li_list_mtx lock, to prevent any
2973 : : * additions into it, and of course we should lock ext4_li_mtx
2974 : : * to atomically free the list and ext4_li_info, because at
2975 : : * this point another ext4 filesystem could be registering
2976 : : * new one.
2977 : : */
2978 : 0 : mutex_lock(&ext4_li_mtx);
2979 : 0 : mutex_lock(&eli->li_list_mtx);
2980 [ # # ]: 0 : if (!list_empty(&eli->li_request_list)) {
2981 : 0 : mutex_unlock(&eli->li_list_mtx);
2982 : 0 : mutex_unlock(&ext4_li_mtx);
2983 : 0 : goto cont_thread;
2984 : : }
2985 : 0 : mutex_unlock(&eli->li_list_mtx);
2986 : 0 : kfree(ext4_li_info);
2987 : 0 : ext4_li_info = NULL;
2988 : 0 : mutex_unlock(&ext4_li_mtx);
2989 : :
2990 : 0 : return 0;
2991 : : }
2992 : :
2993 : 0 : static void ext4_clear_request_list(void)
2994 : : {
2995 : : struct list_head *pos, *n;
2996 : : struct ext4_li_request *elr;
2997 : :
2998 : 0 : mutex_lock(&ext4_li_info->li_list_mtx);
2999 [ # # ]: 0 : list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3000 : 0 : elr = list_entry(pos, struct ext4_li_request,
3001 : : lr_request);
3002 : 0 : ext4_remove_li_request(elr);
3003 : : }
3004 : 0 : mutex_unlock(&ext4_li_info->li_list_mtx);
3005 : 0 : }
3006 : :
3007 : 0 : static int ext4_run_lazyinit_thread(void)
3008 : : {
3009 [ # # ]: 0 : ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3010 : : ext4_li_info, "ext4lazyinit");
3011 [ # # ]: 0 : if (IS_ERR(ext4_lazyinit_task)) {
3012 : : int err = PTR_ERR(ext4_lazyinit_task);
3013 : 0 : ext4_clear_request_list();
3014 : 0 : kfree(ext4_li_info);
3015 : 0 : ext4_li_info = NULL;
3016 : 0 : printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3017 : : "initialization thread\n",
3018 : : err);
3019 : 0 : return err;
3020 : : }
3021 : 0 : ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3022 : 0 : return 0;
3023 : : }
3024 : :
3025 : : /*
3026 : : * Check whether it make sense to run itable init. thread or not.
3027 : : * If there is at least one uninitialized inode table, return
3028 : : * corresponding group number, else the loop goes through all
3029 : : * groups and return total number of groups.
3030 : : */
3031 : 0 : static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3032 : : {
3033 : 4 : ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3034 : : struct ext4_group_desc *gdp = NULL;
3035 : :
3036 [ + + ]: 468 : for (group = 0; group < ngroups; group++) {
3037 : 464 : gdp = ext4_get_group_desc(sb, group, NULL);
3038 [ - + ]: 464 : if (!gdp)
3039 : 0 : continue;
3040 : :
3041 [ + - ]: 464 : if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3042 : : break;
3043 : : }
3044 : :
3045 : 4 : return group;
3046 : : }
3047 : :
3048 : 0 : static int ext4_li_info_new(void)
3049 : : {
3050 : : struct ext4_lazy_init *eli = NULL;
3051 : :
3052 : : eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3053 [ # # ]: 0 : if (!eli)
3054 : : return -ENOMEM;
3055 : :
3056 : 0 : INIT_LIST_HEAD(&eli->li_request_list);
3057 : 0 : mutex_init(&eli->li_list_mtx);
3058 : :
3059 : 0 : eli->li_state |= EXT4_LAZYINIT_QUIT;
3060 : :
3061 : 0 : ext4_li_info = eli;
3062 : :
3063 : 0 : return 0;
3064 : : }
3065 : :
3066 : 0 : static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3067 : : ext4_group_t start)
3068 : : {
3069 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3070 : : struct ext4_li_request *elr;
3071 : :
3072 : : elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3073 [ # # ]: 0 : if (!elr)
3074 : : return NULL;
3075 : :
3076 : 0 : elr->lr_super = sb;
3077 : 0 : elr->lr_sbi = sbi;
3078 : 0 : elr->lr_next_group = start;
3079 : :
3080 : : /*
3081 : : * Randomize first schedule time of the request to
3082 : : * spread the inode table initialization requests
3083 : : * better.
3084 : : */
3085 : 0 : elr->lr_next_sched = jiffies + (prandom_u32() %
3086 : : (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3087 : 0 : return elr;
3088 : : }
3089 : :
3090 : 0 : int ext4_register_li_request(struct super_block *sb,
3091 : : ext4_group_t first_not_zeroed)
3092 : : {
3093 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3094 : : struct ext4_li_request *elr = NULL;
3095 : 4 : ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3096 : : int ret = 0;
3097 : :
3098 : 4 : mutex_lock(&ext4_li_mtx);
3099 [ - + ]: 4 : if (sbi->s_li_request != NULL) {
3100 : : /*
3101 : : * Reset timeout so it can be computed again, because
3102 : : * s_li_wait_mult might have changed.
3103 : : */
3104 : 0 : sbi->s_li_request->lr_timeout = 0;
3105 : 0 : goto out;
3106 : : }
3107 : :
3108 [ - + ][ # # ]: 4 : if (first_not_zeroed == ngroups ||
3109 [ # # ]: 0 : (sb->s_flags & MS_RDONLY) ||
3110 : 0 : !test_opt(sb, INIT_INODE_TABLE))
3111 : : goto out;
3112 : :
3113 : 0 : elr = ext4_li_request_new(sb, first_not_zeroed);
3114 [ # # ]: 0 : if (!elr) {
3115 : : ret = -ENOMEM;
3116 : : goto out;
3117 : : }
3118 : :
3119 [ # # ]: 0 : if (NULL == ext4_li_info) {
3120 : 0 : ret = ext4_li_info_new();
3121 [ # # ]: 0 : if (ret)
3122 : : goto out;
3123 : : }
3124 : :
3125 : 0 : mutex_lock(&ext4_li_info->li_list_mtx);
3126 : 0 : list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3127 : 0 : mutex_unlock(&ext4_li_info->li_list_mtx);
3128 : :
3129 : 0 : sbi->s_li_request = elr;
3130 : : /*
3131 : : * set elr to NULL here since it has been inserted to
3132 : : * the request_list and the removal and free of it is
3133 : : * handled by ext4_clear_request_list from now on.
3134 : : */
3135 : : elr = NULL;
3136 : :
3137 [ # # ]: 0 : if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3138 : 0 : ret = ext4_run_lazyinit_thread();
3139 : : if (ret)
3140 : : goto out;
3141 : : }
3142 : : out:
3143 : 4 : mutex_unlock(&ext4_li_mtx);
3144 [ - + ]: 4 : if (ret)
3145 : 0 : kfree(elr);
3146 : 4 : return ret;
3147 : : }
3148 : :
3149 : : /*
3150 : : * We do not need to lock anything since this is called on
3151 : : * module unload.
3152 : : */
3153 : 0 : static void ext4_destroy_lazyinit_thread(void)
3154 : : {
3155 : : /*
3156 : : * If thread exited earlier
3157 : : * there's nothing to be done.
3158 : : */
3159 [ # # ][ # # ]: 0 : if (!ext4_li_info || !ext4_lazyinit_task)
3160 : 0 : return;
3161 : :
3162 : 0 : kthread_stop(ext4_lazyinit_task);
3163 : : }
3164 : :
3165 : 0 : static int set_journal_csum_feature_set(struct super_block *sb)
3166 : : {
3167 : : int ret = 1;
3168 : : int compat, incompat;
3169 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3170 : :
3171 [ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3172 : : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3173 : : /* journal checksum v2 */
3174 : : compat = 0;
3175 : : incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3176 : : } else {
3177 : : /* journal checksum v1 */
3178 : : compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3179 : : incompat = 0;
3180 : : }
3181 : :
3182 [ # # ]: 0 : if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3183 : 0 : ret = jbd2_journal_set_features(sbi->s_journal,
3184 : : compat, 0,
3185 : 0 : JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3186 : : incompat);
3187 [ # # ]: 0 : } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3188 : 0 : ret = jbd2_journal_set_features(sbi->s_journal,
3189 : : compat, 0,
3190 : : incompat);
3191 : 0 : jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3192 : : JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3193 : : } else {
3194 : 0 : jbd2_journal_clear_features(sbi->s_journal,
3195 : : JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3196 : : JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3197 : : JBD2_FEATURE_INCOMPAT_CSUM_V2);
3198 : : }
3199 : :
3200 : 0 : return ret;
3201 : : }
3202 : :
3203 : : /*
3204 : : * Note: calculating the overhead so we can be compatible with
3205 : : * historical BSD practice is quite difficult in the face of
3206 : : * clusters/bigalloc. This is because multiple metadata blocks from
3207 : : * different block group can end up in the same allocation cluster.
3208 : : * Calculating the exact overhead in the face of clustered allocation
3209 : : * requires either O(all block bitmaps) in memory or O(number of block
3210 : : * groups**2) in time. We will still calculate the superblock for
3211 : : * older file systems --- and if we come across with a bigalloc file
3212 : : * system with zero in s_overhead_clusters the estimate will be close to
3213 : : * correct especially for very large cluster sizes --- but for newer
3214 : : * file systems, it's better to calculate this figure once at mkfs
3215 : : * time, and store it in the superblock. If the superblock value is
3216 : : * present (even for non-bigalloc file systems), we will use it.
3217 : : */
3218 : 0 : static int count_overhead(struct super_block *sb, ext4_group_t grp,
3219 : : char *buf)
3220 : : {
3221 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3222 : : struct ext4_group_desc *gdp;
3223 : : ext4_fsblk_t first_block, last_block, b;
3224 : : ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3225 : : int s, j, count = 0;
3226 : :
3227 [ # # ]: 0 : if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3228 : 0 : return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3229 : 0 : sbi->s_itb_per_group + 2);
3230 : :
3231 : 0 : first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3232 : 0 : (grp * EXT4_BLOCKS_PER_GROUP(sb));
3233 : 0 : last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3234 [ # # ]: 0 : for (i = 0; i < ngroups; i++) {
3235 : 0 : gdp = ext4_get_group_desc(sb, i, NULL);
3236 : : b = ext4_block_bitmap(sb, gdp);
3237 [ # # ]: 0 : if (b >= first_block && b <= last_block) {
3238 : 0 : ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3239 : 0 : count++;
3240 : : }
3241 : : b = ext4_inode_bitmap(sb, gdp);
3242 [ # # ]: 0 : if (b >= first_block && b <= last_block) {
3243 : 0 : ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3244 : 0 : count++;
3245 : : }
3246 : : b = ext4_inode_table(sb, gdp);
3247 [ # # ][ # # ]: 0 : if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3248 [ # # ]: 0 : for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3249 : 0 : int c = EXT4_B2C(sbi, b - first_block);
3250 : : ext4_set_bit(c, buf);
3251 : 0 : count++;
3252 : : }
3253 [ # # ]: 0 : if (i != grp)
3254 : 0 : continue;
3255 : : s = 0;
3256 [ # # ]: 0 : if (ext4_bg_has_super(sb, grp)) {
3257 : : ext4_set_bit(s++, buf);
3258 : 0 : count++;
3259 : : }
3260 [ # # ]: 0 : for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3261 : 0 : ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3262 : 0 : count++;
3263 : : }
3264 : : }
3265 [ # # ]: 0 : if (!count)
3266 : : return 0;
3267 : 0 : return EXT4_CLUSTERS_PER_GROUP(sb) -
3268 : 0 : ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3269 : : }
3270 : :
3271 : : /*
3272 : : * Compute the overhead and stash it in sbi->s_overhead
3273 : : */
3274 : 0 : int ext4_calculate_overhead(struct super_block *sb)
3275 : : {
3276 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
3277 : 0 : struct ext4_super_block *es = sbi->s_es;
3278 : : ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3279 : : ext4_fsblk_t overhead = 0;
3280 : 0 : char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3281 : :
3282 [ # # ]: 0 : if (!buf)
3283 : : return -ENOMEM;
3284 : :
3285 : : /*
3286 : : * Compute the overhead (FS structures). This is constant
3287 : : * for a given filesystem unless the number of block groups
3288 : : * changes so we cache the previous value until it does.
3289 : : */
3290 : :
3291 : : /*
3292 : : * All of the blocks before first_data_block are overhead
3293 : : */
3294 : 0 : overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3295 : :
3296 : : /*
3297 : : * Add the overhead found in each block group
3298 : : */
3299 [ # # ]: 0 : for (i = 0; i < ngroups; i++) {
3300 : : int blks;
3301 : :
3302 : 0 : blks = count_overhead(sb, i, buf);
3303 : 0 : overhead += blks;
3304 [ # # ]: 0 : if (blks)
3305 : 0 : memset(buf, 0, PAGE_SIZE);
3306 : 0 : cond_resched();
3307 : : }
3308 : : /* Add the journal blocks as well */
3309 [ # # ]: 0 : if (sbi->s_journal)
3310 : 0 : overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3311 : :
3312 : 0 : sbi->s_overhead = overhead;
3313 : 0 : smp_wmb();
3314 : 0 : free_page((unsigned long) buf);
3315 : 0 : return 0;
3316 : : }
3317 : :
3318 : :
3319 : 0 : static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
3320 : : {
3321 : : ext4_fsblk_t resv_clusters;
3322 : :
3323 : : /*
3324 : : * There's no need to reserve anything when we aren't using extents.
3325 : : * The space estimates are exact, there are no unwritten extents,
3326 : : * hole punching doesn't need new metadata... This is needed especially
3327 : : * to keep ext2/3 backward compatibility.
3328 : : */
3329 [ # # ]: 0 : if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3330 : : return 0;
3331 : : /*
3332 : : * By default we reserve 2% or 4096 clusters, whichever is smaller.
3333 : : * This should cover the situations where we can not afford to run
3334 : : * out of space like for example punch hole, or converting
3335 : : * uninitialized extents in delalloc path. In most cases such
3336 : : * allocation would require 1, or 2 blocks, higher numbers are
3337 : : * very rare.
3338 : : */
3339 : 0 : resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3340 : 0 : EXT4_SB(sb)->s_cluster_bits;
3341 : :
3342 : 0 : do_div(resv_clusters, 50);
3343 : 0 : resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3344 : :
3345 : 0 : return resv_clusters;
3346 : : }
3347 : :
3348 : :
3349 : 0 : static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3350 : : {
3351 : 0 : ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3352 : 0 : sbi->s_cluster_bits;
3353 : :
3354 [ # # ]: 0 : if (count >= clusters)
3355 : : return -EINVAL;
3356 : :
3357 : 0 : atomic64_set(&sbi->s_resv_clusters, count);
3358 : 0 : return 0;
3359 : : }
3360 : :
3361 : 0 : static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3362 : : {
3363 : 0 : char *orig_data = kstrdup(data, GFP_KERNEL);
3364 : : struct buffer_head *bh;
3365 : 0 : struct ext4_super_block *es = NULL;
3366 : 0 : struct ext4_sb_info *sbi;
3367 : : ext4_fsblk_t block;
3368 : 0 : ext4_fsblk_t sb_block = get_sb_block(&data);
3369 : : ext4_fsblk_t logical_sb_block;
3370 : : unsigned long offset = 0;
3371 : 0 : unsigned long journal_devnum = 0;
3372 : : unsigned long def_mount_opts;
3373 : : struct inode *root;
3374 : : char *cp;
3375 : : const char *descr;
3376 : : int ret = -ENOMEM;
3377 : : int blocksize, clustersize;
3378 : : unsigned int db_count;
3379 : : unsigned int i;
3380 : : int needs_recovery, has_huge_files, has_bigalloc;
3381 : : __u64 blocks_count;
3382 : : int err = 0;
3383 : 0 : unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3384 : : ext4_group_t first_not_zeroed;
3385 : :
3386 : : sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3387 [ # # ]: 0 : if (!sbi)
3388 : : goto out_free_orig;
3389 : :
3390 : 0 : sbi->s_blockgroup_lock =
3391 : : kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3392 [ # # ]: 0 : if (!sbi->s_blockgroup_lock) {
3393 : 0 : kfree(sbi);
3394 : 0 : goto out_free_orig;
3395 : : }
3396 : 0 : sb->s_fs_info = sbi;
3397 : 0 : sbi->s_sb = sb;
3398 : 0 : sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3399 : 0 : sbi->s_sb_block = sb_block;
3400 [ # # ]: 0 : if (sb->s_bdev->bd_part)
3401 : 0 : sbi->s_sectors_written_start =
3402 [ # # ]: 0 : part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3403 : :
3404 : : /* Cleanup superblock name */
3405 [ # # ]: 0 : for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3406 : 0 : *cp = '!';
3407 : :
3408 : : /* -EINVAL is default */
3409 : : ret = -EINVAL;
3410 : 0 : blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3411 [ # # ]: 0 : if (!blocksize) {
3412 : 0 : ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3413 : 0 : goto out_fail;
3414 : : }
3415 : :
3416 : : /*
3417 : : * The ext4 superblock will not be buffer aligned for other than 1kB
3418 : : * block sizes. We need to calculate the offset from buffer start.
3419 : : */
3420 [ # # ]: 0 : if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3421 : 0 : logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3422 [ # # ][ # # ]: 0 : offset = do_div(logical_sb_block, blocksize);
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
3423 : : } else {
3424 : : logical_sb_block = sb_block;
3425 : : }
3426 : :
3427 [ # # ]: 0 : if (!(bh = sb_bread(sb, logical_sb_block))) {
3428 : 0 : ext4_msg(sb, KERN_ERR, "unable to read superblock");
3429 : 0 : goto out_fail;
3430 : : }
3431 : : /*
3432 : : * Note: s_es must be initialized as soon as possible because
3433 : : * some ext4 macro-instructions depend on its value
3434 : : */
3435 : 0 : es = (struct ext4_super_block *) (bh->b_data + offset);
3436 : 0 : sbi->s_es = es;
3437 : 0 : sb->s_magic = le16_to_cpu(es->s_magic);
3438 [ # # ]: 0 : if (sb->s_magic != EXT4_SUPER_MAGIC)
3439 : : goto cantfind_ext4;
3440 : 0 : sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3441 : :
3442 : : /* Warn if metadata_csum and gdt_csum are both set. */
3443 [ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3444 [ # # ]: 0 : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3445 : 0 : EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3446 : 0 : ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3447 : : "redundant flags; please run fsck.");
3448 : :
3449 : : /* Check for a known checksum algorithm */
3450 [ # # ]: 0 : if (!ext4_verify_csum_type(sb, es)) {
3451 : 0 : ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3452 : : "unknown checksum algorithm.");
3453 : : silent = 1;
3454 : 0 : goto cantfind_ext4;
3455 : : }
3456 : :
3457 : : /* Load the checksum driver */
3458 [ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3459 : : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3460 : 0 : sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3461 [ # # ]: 0 : if (IS_ERR(sbi->s_chksum_driver)) {
3462 : 0 : ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3463 : 0 : ret = PTR_ERR(sbi->s_chksum_driver);
3464 : 0 : sbi->s_chksum_driver = NULL;
3465 : 0 : goto failed_mount;
3466 : : }
3467 : : }
3468 : :
3469 : : /* Check superblock checksum */
3470 [ # # ]: 0 : if (!ext4_superblock_csum_verify(sb, es)) {
3471 : 0 : ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3472 : : "invalid superblock checksum. Run e2fsck?");
3473 : : silent = 1;
3474 : 0 : goto cantfind_ext4;
3475 : : }
3476 : :
3477 : : /* Precompute checksum seed for all metadata */
3478 [ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3479 : : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3480 : 0 : sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3481 : : sizeof(es->s_uuid));
3482 : :
3483 : : /* Set defaults before we parse the mount options */
3484 : 0 : def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3485 : 0 : set_opt(sb, INIT_INODE_TABLE);
3486 [ # # ]: 0 : if (def_mount_opts & EXT4_DEFM_DEBUG)
3487 : 0 : set_opt(sb, DEBUG);
3488 [ # # ]: 0 : if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3489 : 0 : set_opt(sb, GRPID);
3490 [ # # ]: 0 : if (def_mount_opts & EXT4_DEFM_UID16)
3491 : 0 : set_opt(sb, NO_UID32);
3492 : : /* xattr user namespace & acls are now defaulted on */
3493 : 0 : set_opt(sb, XATTR_USER);
3494 : : #ifdef CONFIG_EXT4_FS_POSIX_ACL
3495 : : set_opt(sb, POSIX_ACL);
3496 : : #endif
3497 [ # # ]: 0 : if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3498 : 0 : set_opt(sb, JOURNAL_DATA);
3499 [ # # ]: 0 : else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3500 : 0 : set_opt(sb, ORDERED_DATA);
3501 [ # # ]: 0 : else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3502 : 0 : set_opt(sb, WRITEBACK_DATA);
3503 : :
3504 [ # # ]: 0 : if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3505 : 0 : set_opt(sb, ERRORS_PANIC);
3506 [ # # ]: 0 : else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3507 : 0 : set_opt(sb, ERRORS_CONT);
3508 : : else
3509 : 0 : set_opt(sb, ERRORS_RO);
3510 [ # # ]: 0 : if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3511 : 0 : set_opt(sb, BLOCK_VALIDITY);
3512 [ # # ]: 0 : if (def_mount_opts & EXT4_DEFM_DISCARD)
3513 : 0 : set_opt(sb, DISCARD);
3514 : :
3515 : 0 : sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3516 : 0 : sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3517 : 0 : sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3518 : 0 : sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3519 : 0 : sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3520 : :
3521 [ # # ]: 0 : if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3522 : 0 : set_opt(sb, BARRIER);
3523 : :
3524 : : /*
3525 : : * enable delayed allocation by default
3526 : : * Use -o nodelalloc to turn it off
3527 : : */
3528 [ # # ]: 0 : if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3529 : 0 : ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3530 : 0 : set_opt(sb, DELALLOC);
3531 : :
3532 : : /*
3533 : : * set default s_li_wait_mult for lazyinit, for the case there is
3534 : : * no mount option specified.
3535 : : */
3536 : 0 : sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3537 : :
3538 [ # # ]: 0 : if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3539 : : &journal_devnum, &journal_ioprio, 0)) {
3540 : 0 : ext4_msg(sb, KERN_WARNING,
3541 : : "failed to parse options in superblock: %s",
3542 : : sbi->s_es->s_mount_opts);
3543 : : }
3544 : 0 : sbi->s_def_mount_opt = sbi->s_mount_opt;
3545 [ # # ]: 0 : if (!parse_options((char *) data, sb, &journal_devnum,
3546 : : &journal_ioprio, 0))
3547 : : goto failed_mount;
3548 : :
3549 [ # # ]: 0 : if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3550 [ # # ]: 0 : printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3551 : : "with data=journal disables delayed "
3552 : : "allocation and O_DIRECT support!\n");
3553 [ # # ]: 0 : if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3554 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
3555 : : "both data=journal and delalloc");
3556 : 0 : goto failed_mount;
3557 : : }
3558 [ # # ]: 0 : if (test_opt(sb, DIOREAD_NOLOCK)) {
3559 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
3560 : : "both data=journal and dioread_nolock");
3561 : 0 : goto failed_mount;
3562 : : }
3563 [ # # ]: 0 : if (test_opt(sb, DELALLOC))
3564 : 0 : clear_opt(sb, DELALLOC);
3565 : : }
3566 : :
3567 [ # # ]: 0 : sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3568 : 0 : (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3569 : :
3570 [ # # ][ # # ]: 0 : if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3571 [ # # ]: 0 : (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3572 [ # # ]: 0 : EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3573 : 0 : EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3574 : 0 : ext4_msg(sb, KERN_WARNING,
3575 : : "feature flags set on rev 0 fs, "
3576 : : "running e2fsck is recommended");
3577 : :
3578 : : if (IS_EXT2_SB(sb)) {
3579 : : if (ext2_feature_set_ok(sb))
3580 : : ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3581 : : "using the ext4 subsystem");
3582 : : else {
3583 : : ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3584 : : "to feature incompatibilities");
3585 : : goto failed_mount;
3586 : : }
3587 : : }
3588 : :
3589 : : if (IS_EXT3_SB(sb)) {
3590 : : if (ext3_feature_set_ok(sb))
3591 : : ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3592 : : "using the ext4 subsystem");
3593 : : else {
3594 : : ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3595 : : "to feature incompatibilities");
3596 : : goto failed_mount;
3597 : : }
3598 : : }
3599 : :
3600 : : /*
3601 : : * Check feature flags regardless of the revision level, since we
3602 : : * previously didn't change the revision level when setting the flags,
3603 : : * so there is a chance incompat flags are set on a rev 0 filesystem.
3604 : : */
3605 [ # # ]: 0 : if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3606 : : goto failed_mount;
3607 : :
3608 : 0 : blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3609 [ # # ]: 0 : if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3610 : : blocksize > EXT4_MAX_BLOCK_SIZE) {
3611 : 0 : ext4_msg(sb, KERN_ERR,
3612 : : "Unsupported filesystem blocksize %d", blocksize);
3613 : 0 : goto failed_mount;
3614 : : }
3615 : :
3616 [ # # ]: 0 : if (sb->s_blocksize != blocksize) {
3617 : : /* Validate the filesystem blocksize */
3618 [ # # ]: 0 : if (!sb_set_blocksize(sb, blocksize)) {
3619 : 0 : ext4_msg(sb, KERN_ERR, "bad block size %d",
3620 : : blocksize);
3621 : 0 : goto failed_mount;
3622 : : }
3623 : :
3624 : : brelse(bh);
3625 : 0 : logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3626 [ # # ][ # # ]: 0 : offset = do_div(logical_sb_block, blocksize);
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
3627 : : bh = sb_bread(sb, logical_sb_block);
3628 [ # # ]: 0 : if (!bh) {
3629 : 0 : ext4_msg(sb, KERN_ERR,
3630 : : "Can't read superblock on 2nd try");
3631 : 0 : goto failed_mount;
3632 : : }
3633 : 0 : es = (struct ext4_super_block *)(bh->b_data + offset);
3634 : 0 : sbi->s_es = es;
3635 [ # # ]: 0 : if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3636 : 0 : ext4_msg(sb, KERN_ERR,
3637 : : "Magic mismatch, very weird!");
3638 : 0 : goto failed_mount;
3639 : : }
3640 : : }
3641 : :
3642 : 0 : has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3643 : : EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3644 : 0 : sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3645 : : has_huge_files);
3646 : 0 : sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3647 : :
3648 [ # # ]: 0 : if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3649 : 0 : sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3650 : 0 : sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3651 : : } else {
3652 : 0 : sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3653 : 0 : sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3654 [ # # ][ # # ]: 0 : if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3655 [ # # ]: 0 : (!is_power_of_2(sbi->s_inode_size)) ||
3656 : : (sbi->s_inode_size > blocksize)) {
3657 : 0 : ext4_msg(sb, KERN_ERR,
3658 : : "unsupported inode size: %d",
3659 : : sbi->s_inode_size);
3660 : 0 : goto failed_mount;
3661 : : }
3662 [ # # ]: 0 : if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3663 : 0 : sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3664 : : }
3665 : :
3666 : 0 : sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3667 [ # # ]: 0 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3668 [ # # ]: 0 : if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3669 [ # # ]: 0 : sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3670 : : !is_power_of_2(sbi->s_desc_size)) {
3671 : 0 : ext4_msg(sb, KERN_ERR,
3672 : : "unsupported descriptor size %lu",
3673 : : sbi->s_desc_size);
3674 : 0 : goto failed_mount;
3675 : : }
3676 : : } else
3677 : 0 : sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3678 : :
3679 : 0 : sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3680 : 0 : sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3681 [ # # ][ # # ]: 0 : if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3682 : : goto cantfind_ext4;
3683 : :
3684 : 0 : sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3685 [ # # ]: 0 : if (sbi->s_inodes_per_block == 0)
3686 : : goto cantfind_ext4;
3687 : 0 : sbi->s_itb_per_group = sbi->s_inodes_per_group /
3688 : : sbi->s_inodes_per_block;
3689 : 0 : sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3690 : 0 : sbi->s_sbh = bh;
3691 : 0 : sbi->s_mount_state = le16_to_cpu(es->s_state);
3692 [ # # ][ # # ]: 0 : sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
3693 : 0 : sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3694 : :
3695 [ # # ]: 0 : for (i = 0; i < 4; i++)
3696 : 0 : sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3697 : 0 : sbi->s_def_hash_version = es->s_def_hash_version;
3698 : 0 : i = le32_to_cpu(es->s_flags);
3699 [ # # ]: 0 : if (i & EXT2_FLAGS_UNSIGNED_HASH)
3700 : 0 : sbi->s_hash_unsigned = 3;
3701 [ # # ]: 0 : else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3702 : : #ifdef __CHAR_UNSIGNED__
3703 : 0 : es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3704 : 0 : sbi->s_hash_unsigned = 3;
3705 : : #else
3706 : : es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3707 : : #endif
3708 : : }
3709 : :
3710 : : /* Handle clustersize */
3711 : 0 : clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3712 : 0 : has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3713 : : EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3714 [ # # ]: 0 : if (has_bigalloc) {
3715 [ # # ]: 0 : if (clustersize < blocksize) {
3716 : 0 : ext4_msg(sb, KERN_ERR,
3717 : : "cluster size (%d) smaller than "
3718 : : "block size (%d)", clustersize, blocksize);
3719 : 0 : goto failed_mount;
3720 : : }
3721 : 0 : sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3722 : 0 : le32_to_cpu(es->s_log_block_size);
3723 : 0 : sbi->s_clusters_per_group =
3724 : 0 : le32_to_cpu(es->s_clusters_per_group);
3725 [ # # ]: 0 : if (sbi->s_clusters_per_group > blocksize * 8) {
3726 : 0 : ext4_msg(sb, KERN_ERR,
3727 : : "#clusters per group too big: %lu",
3728 : : sbi->s_clusters_per_group);
3729 : 0 : goto failed_mount;
3730 : : }
3731 [ # # ]: 0 : if (sbi->s_blocks_per_group !=
3732 : 0 : (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3733 : 0 : ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3734 : : "clusters per group (%lu) inconsistent",
3735 : : sbi->s_blocks_per_group,
3736 : : sbi->s_clusters_per_group);
3737 : 0 : goto failed_mount;
3738 : : }
3739 : : } else {
3740 [ # # ]: 0 : if (clustersize != blocksize) {
3741 : 0 : ext4_warning(sb, "fragment/cluster size (%d) != "
3742 : : "block size (%d)", clustersize,
3743 : : blocksize);
3744 : : clustersize = blocksize;
3745 : : }
3746 [ # # ]: 0 : if (sbi->s_blocks_per_group > blocksize * 8) {
3747 : 0 : ext4_msg(sb, KERN_ERR,
3748 : : "#blocks per group too big: %lu",
3749 : : sbi->s_blocks_per_group);
3750 : 0 : goto failed_mount;
3751 : : }
3752 : 0 : sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3753 : 0 : sbi->s_cluster_bits = 0;
3754 : : }
3755 : 0 : sbi->s_cluster_ratio = clustersize / blocksize;
3756 : :
3757 [ # # ]: 0 : if (sbi->s_inodes_per_group > blocksize * 8) {
3758 : 0 : ext4_msg(sb, KERN_ERR,
3759 : : "#inodes per group too big: %lu",
3760 : : sbi->s_inodes_per_group);
3761 : 0 : goto failed_mount;
3762 : : }
3763 : :
3764 : : /* Do we have standard group size of clustersize * 8 blocks ? */
3765 [ # # ]: 0 : if (sbi->s_blocks_per_group == clustersize << 3)
3766 : 0 : set_opt2(sb, STD_GROUP_SIZE);
3767 : :
3768 : : /*
3769 : : * Test whether we have more sectors than will fit in sector_t,
3770 : : * and whether the max offset is addressable by the page cache.
3771 : : */
3772 : 0 : err = generic_check_addressable(sb->s_blocksize_bits,
3773 : : ext4_blocks_count(es));
3774 [ # # ]: 0 : if (err) {
3775 : 0 : ext4_msg(sb, KERN_ERR, "filesystem"
3776 : : " too large to mount safely on this system");
3777 : : if (sizeof(sector_t) < 8)
3778 : : ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3779 : 0 : goto failed_mount;
3780 : : }
3781 : :
3782 [ # # ]: 0 : if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3783 : : goto cantfind_ext4;
3784 : :
3785 : : /* check blocks count against device size */
3786 : 0 : blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3787 [ # # ][ # # ]: 0 : if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3788 : 0 : ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3789 : : "exceeds size of device (%llu blocks)",
3790 : : ext4_blocks_count(es), blocks_count);
3791 : 0 : goto failed_mount;
3792 : : }
3793 : :
3794 : : /*
3795 : : * It makes no sense for the first data block to be beyond the end
3796 : : * of the filesystem.
3797 : : */
3798 [ # # ]: 0 : if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3799 : 0 : ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3800 : : "block %u is beyond end of filesystem (%llu)",
3801 : : le32_to_cpu(es->s_first_data_block),
3802 : : ext4_blocks_count(es));
3803 : 0 : goto failed_mount;
3804 : : }
3805 : 0 : blocks_count = (ext4_blocks_count(es) -
3806 : 0 : le32_to_cpu(es->s_first_data_block) +
3807 : : EXT4_BLOCKS_PER_GROUP(sb) - 1);
3808 [ # # ][ # # ]: 0 : do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
3809 [ # # ]: 0 : if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3810 : 0 : ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3811 : : "(block count %llu, first data block %u, "
3812 : : "blocks per group %lu)", sbi->s_groups_count,
3813 : : ext4_blocks_count(es),
3814 : : le32_to_cpu(es->s_first_data_block),
3815 : : EXT4_BLOCKS_PER_GROUP(sb));
3816 : 0 : goto failed_mount;
3817 : : }
3818 : 0 : sbi->s_groups_count = blocks_count;
3819 : 0 : sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3820 : : (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3821 : 0 : db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3822 : : EXT4_DESC_PER_BLOCK(sb);
3823 : 0 : sbi->s_group_desc = ext4_kvmalloc(db_count *
3824 : : sizeof(struct buffer_head *),
3825 : : GFP_KERNEL);
3826 [ # # ]: 0 : if (sbi->s_group_desc == NULL) {
3827 : 0 : ext4_msg(sb, KERN_ERR, "not enough memory");
3828 : : ret = -ENOMEM;
3829 : 0 : goto failed_mount;
3830 : : }
3831 : :
3832 [ # # ]: 0 : if (ext4_proc_root)
3833 : 0 : sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3834 : :
3835 [ # # ]: 0 : if (sbi->s_proc)
3836 : 0 : proc_create_data("options", S_IRUGO, sbi->s_proc,
3837 : : &ext4_seq_options_fops, sb);
3838 : :
3839 : 0 : bgl_lock_init(sbi->s_blockgroup_lock);
3840 : :
3841 [ # # ]: 0 : for (i = 0; i < db_count; i++) {
3842 : 0 : block = descriptor_loc(sb, logical_sb_block, i);
3843 : 0 : sbi->s_group_desc[i] = sb_bread(sb, block);
3844 [ # # ]: 0 : if (!sbi->s_group_desc[i]) {
3845 : 0 : ext4_msg(sb, KERN_ERR,
3846 : : "can't read group descriptor %d", i);
3847 : : db_count = i;
3848 : 0 : goto failed_mount2;
3849 : : }
3850 : : }
3851 [ # # ]: 0 : if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3852 : 0 : ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3853 : 0 : goto failed_mount2;
3854 : : }
3855 [ # # ]: 0 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3856 [ # # ]: 0 : if (!ext4_fill_flex_info(sb)) {
3857 : 0 : ext4_msg(sb, KERN_ERR,
3858 : : "unable to initialize "
3859 : : "flex_bg meta info!");
3860 : 0 : goto failed_mount2;
3861 : : }
3862 : :
3863 : 0 : sbi->s_gdb_count = db_count;
3864 : 0 : get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3865 : 0 : spin_lock_init(&sbi->s_next_gen_lock);
3866 : :
3867 : 0 : init_timer(&sbi->s_err_report);
3868 : 0 : sbi->s_err_report.function = print_daily_error_info;
3869 : 0 : sbi->s_err_report.data = (unsigned long) sb;
3870 : :
3871 : : /* Register extent status tree shrinker */
3872 : 0 : ext4_es_register_shrinker(sbi);
3873 : :
3874 : 0 : err = percpu_counter_init(&sbi->s_freeclusters_counter,
3875 : : ext4_count_free_clusters(sb));
3876 [ # # ]: 0 : if (!err) {
3877 : 0 : err = percpu_counter_init(&sbi->s_freeinodes_counter,
3878 : : ext4_count_free_inodes(sb));
3879 : : }
3880 [ # # ]: 0 : if (!err) {
3881 : 0 : err = percpu_counter_init(&sbi->s_dirs_counter,
3882 : : ext4_count_dirs(sb));
3883 : : }
3884 [ # # ]: 0 : if (!err) {
3885 : 0 : err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3886 : : }
3887 [ # # ]: 0 : if (!err) {
3888 : 0 : err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
3889 : : }
3890 [ # # ]: 0 : if (err) {
3891 : 0 : ext4_msg(sb, KERN_ERR, "insufficient memory");
3892 : 0 : goto failed_mount3;
3893 : : }
3894 : :
3895 : 0 : sbi->s_stripe = ext4_get_stripe_size(sbi);
3896 : 0 : sbi->s_extent_max_zeroout_kb = 32;
3897 : :
3898 : : /*
3899 : : * set up enough so that it can read an inode
3900 : : */
3901 [ # # ][ # # ]: 0 : if (!test_opt(sb, NOLOAD) &&
3902 : 0 : EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3903 : 0 : sb->s_op = &ext4_sops;
3904 : : else
3905 : 0 : sb->s_op = &ext4_nojournal_sops;
3906 : 0 : sb->s_export_op = &ext4_export_ops;
3907 : 0 : sb->s_xattr = ext4_xattr_handlers;
3908 : : #ifdef CONFIG_QUOTA
3909 : 0 : sb->dq_op = &ext4_quota_operations;
3910 [ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
3911 : 0 : sb->s_qcop = &ext4_qctl_sysfile_operations;
3912 : : else
3913 : 0 : sb->s_qcop = &ext4_qctl_operations;
3914 : : #endif
3915 : 0 : memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3916 : :
3917 : 0 : INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3918 : 0 : mutex_init(&sbi->s_orphan_lock);
3919 : :
3920 : 0 : sb->s_root = NULL;
3921 : :
3922 [ # # ][ # # ]: 0 : needs_recovery = (es->s_last_orphan != 0 ||
3923 : 0 : EXT4_HAS_INCOMPAT_FEATURE(sb,
3924 : : EXT4_FEATURE_INCOMPAT_RECOVER));
3925 : :
3926 [ # # ][ # # ]: 0 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3927 : 0 : !(sb->s_flags & MS_RDONLY))
3928 [ # # ]: 0 : if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3929 : : goto failed_mount3;
3930 : :
3931 : : /*
3932 : : * The first inode we look at is the journal inode. Don't try
3933 : : * root first: it may be modified in the journal!
3934 : : */
3935 [ # # ][ # # ]: 0 : if (!test_opt(sb, NOLOAD) &&
3936 : 0 : EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3937 [ # # ]: 0 : if (ext4_load_journal(sb, es, journal_devnum))
3938 : : goto failed_mount3;
3939 [ # # ][ # # ]: 0 : } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
[ # # ]
3940 : 0 : EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3941 : 0 : ext4_msg(sb, KERN_ERR, "required journal recovery "
3942 : : "suppressed and not mounted read-only");
3943 : 0 : goto failed_mount_wq;
3944 : : } else {
3945 : 0 : clear_opt(sb, DATA_FLAGS);
3946 : 0 : sbi->s_journal = NULL;
3947 : : needs_recovery = 0;
3948 : 0 : goto no_journal;
3949 : : }
3950 : :
3951 [ # # # # ]: 0 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3952 : 0 : !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3953 : : JBD2_FEATURE_INCOMPAT_64BIT)) {
3954 : 0 : ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3955 : 0 : goto failed_mount_wq;
3956 : : }
3957 : :
3958 [ # # ]: 0 : if (!set_journal_csum_feature_set(sb)) {
3959 : 0 : ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3960 : : "feature set");
3961 : 0 : goto failed_mount_wq;
3962 : : }
3963 : :
3964 : : /* We have now updated the journal if required, so we can
3965 : : * validate the data journaling mode. */
3966 [ # # # ]: 0 : switch (test_opt(sb, DATA_FLAGS)) {
3967 : : case 0:
3968 : : /* No mode set, assume a default based on the journal
3969 : : * capabilities: ORDERED_DATA if the journal can
3970 : : * cope, else JOURNAL_DATA
3971 : : */
3972 [ # # ]: 0 : if (jbd2_journal_check_available_features
3973 : 0 : (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3974 : 0 : set_opt(sb, ORDERED_DATA);
3975 : : else
3976 : 0 : set_opt(sb, JOURNAL_DATA);
3977 : : break;
3978 : :
3979 : : case EXT4_MOUNT_ORDERED_DATA:
3980 : : case EXT4_MOUNT_WRITEBACK_DATA:
3981 [ # # ]: 0 : if (!jbd2_journal_check_available_features
3982 : 0 : (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3983 : 0 : ext4_msg(sb, KERN_ERR, "Journal does not support "
3984 : : "requested data journaling mode");
3985 : 0 : goto failed_mount_wq;
3986 : : }
3987 : : default:
3988 : : break;
3989 : : }
3990 : 0 : set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3991 : :
3992 : 0 : sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3993 : :
3994 : : /*
3995 : : * The journal may have updated the bg summary counts, so we
3996 : : * need to update the global counters.
3997 : : */
3998 : 0 : percpu_counter_set(&sbi->s_freeclusters_counter,
3999 : 0 : ext4_count_free_clusters(sb));
4000 : 0 : percpu_counter_set(&sbi->s_freeinodes_counter,
4001 : 0 : ext4_count_free_inodes(sb));
4002 : 0 : percpu_counter_set(&sbi->s_dirs_counter,
4003 : 0 : ext4_count_dirs(sb));
4004 : 0 : percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
4005 : :
4006 : : no_journal:
4007 : : /*
4008 : : * Get the # of file system overhead blocks from the
4009 : : * superblock if present.
4010 : : */
4011 [ # # ]: 0 : if (es->s_overhead_clusters)
4012 : 0 : sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4013 : : else {
4014 : 0 : err = ext4_calculate_overhead(sb);
4015 [ # # ]: 0 : if (err)
4016 : : goto failed_mount_wq;
4017 : : }
4018 : :
4019 : : /*
4020 : : * The maximum number of concurrent works can be high and
4021 : : * concurrency isn't really necessary. Limit it to 1.
4022 : : */
4023 : 0 : EXT4_SB(sb)->rsv_conversion_wq =
4024 : 0 : alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4025 [ # # ]: 0 : if (!EXT4_SB(sb)->rsv_conversion_wq) {
4026 : 0 : printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4027 : : ret = -ENOMEM;
4028 : 0 : goto failed_mount4;
4029 : : }
4030 : :
4031 : : /*
4032 : : * The jbd2_journal_load will have done any necessary log recovery,
4033 : : * so we can safely mount the rest of the filesystem now.
4034 : : */
4035 : :
4036 : 0 : root = ext4_iget(sb, EXT4_ROOT_INO);
4037 [ # # ]: 0 : if (IS_ERR(root)) {
4038 : 0 : ext4_msg(sb, KERN_ERR, "get root inode failed");
4039 : : ret = PTR_ERR(root);
4040 : : root = NULL;
4041 : 0 : goto failed_mount4;
4042 : : }
4043 [ # # ][ # # ]: 0 : if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
[ # # ]
4044 : 0 : ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4045 : 0 : iput(root);
4046 : 0 : goto failed_mount4;
4047 : : }
4048 : 0 : sb->s_root = d_make_root(root);
4049 [ # # ]: 0 : if (!sb->s_root) {
4050 : 0 : ext4_msg(sb, KERN_ERR, "get root dentry failed");
4051 : : ret = -ENOMEM;
4052 : 0 : goto failed_mount4;
4053 : : }
4054 : :
4055 [ # # ]: 0 : if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4056 : 0 : sb->s_flags |= MS_RDONLY;
4057 : :
4058 : : /* determine the minimum size of new large inodes, if present */
4059 [ # # ]: 0 : if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4060 : 0 : sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4061 : : EXT4_GOOD_OLD_INODE_SIZE;
4062 [ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4063 : : EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4064 [ # # ]: 0 : if (sbi->s_want_extra_isize <
4065 : 0 : le16_to_cpu(es->s_want_extra_isize))
4066 : 0 : sbi->s_want_extra_isize =
4067 : : le16_to_cpu(es->s_want_extra_isize);
4068 [ # # ]: 0 : if (sbi->s_want_extra_isize <
4069 : 0 : le16_to_cpu(es->s_min_extra_isize))
4070 : 0 : sbi->s_want_extra_isize =
4071 : : le16_to_cpu(es->s_min_extra_isize);
4072 : : }
4073 : : }
4074 : : /* Check if enough inode space is available */
4075 [ # # ]: 0 : if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4076 : 0 : sbi->s_inode_size) {
4077 : 0 : sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4078 : : EXT4_GOOD_OLD_INODE_SIZE;
4079 : 0 : ext4_msg(sb, KERN_INFO, "required extra inode space not"
4080 : : "available");
4081 : : }
4082 : :
4083 : 0 : err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
4084 [ # # ]: 0 : if (err) {
4085 : 0 : ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
4086 : : "reserved pool", ext4_calculate_resv_clusters(sb));
4087 : 0 : goto failed_mount4a;
4088 : : }
4089 : :
4090 : 0 : err = ext4_setup_system_zone(sb);
4091 [ # # ]: 0 : if (err) {
4092 : 0 : ext4_msg(sb, KERN_ERR, "failed to initialize system "
4093 : : "zone (%d)", err);
4094 : 0 : goto failed_mount4a;
4095 : : }
4096 : :
4097 : 0 : ext4_ext_init(sb);
4098 : 0 : err = ext4_mb_init(sb);
4099 [ # # ]: 0 : if (err) {
4100 : 0 : ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4101 : : err);
4102 : 0 : goto failed_mount5;
4103 : : }
4104 : :
4105 : 0 : err = ext4_register_li_request(sb, first_not_zeroed);
4106 [ # # ]: 0 : if (err)
4107 : : goto failed_mount6;
4108 : :
4109 : 0 : sbi->s_kobj.kset = ext4_kset;
4110 : : init_completion(&sbi->s_kobj_unregister);
4111 : 0 : err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4112 : : "%s", sb->s_id);
4113 [ # # ]: 0 : if (err)
4114 : : goto failed_mount7;
4115 : :
4116 : : #ifdef CONFIG_QUOTA
4117 : : /* Enable quota usage during mount. */
4118 [ # # ][ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4119 : 0 : !(sb->s_flags & MS_RDONLY)) {
4120 : 0 : err = ext4_enable_quotas(sb);
4121 [ # # ]: 0 : if (err)
4122 : : goto failed_mount8;
4123 : : }
4124 : : #endif /* CONFIG_QUOTA */
4125 : :
4126 : 0 : EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4127 : 0 : ext4_orphan_cleanup(sb, es);
4128 : 0 : EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4129 [ # # ]: 0 : if (needs_recovery) {
4130 : 0 : ext4_msg(sb, KERN_INFO, "recovery complete");
4131 : 0 : ext4_mark_recovery_complete(sb, es);
4132 : : }
4133 [ # # ]: 0 : if (EXT4_SB(sb)->s_journal) {
4134 [ # # ]: 0 : if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4135 : : descr = " journalled data mode";
4136 [ # # ]: 0 : else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4137 : : descr = " ordered data mode";
4138 : : else
4139 : : descr = " writeback data mode";
4140 : : } else
4141 : : descr = "out journal";
4142 : :
4143 [ # # ]: 0 : if (test_opt(sb, DISCARD)) {
4144 : 0 : struct request_queue *q = bdev_get_queue(sb->s_bdev);
4145 [ # # ]: 0 : if (!blk_queue_discard(q))
4146 : 0 : ext4_msg(sb, KERN_WARNING,
4147 : : "mounting with \"discard\" option, but "
4148 : : "the device does not support discard");
4149 : : }
4150 : :
4151 [ # # ]: 0 : ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4152 : : "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4153 : : *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4154 : :
4155 [ # # ]: 0 : if (es->s_error_count)
4156 : 0 : mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4157 : :
4158 : : /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4159 : : ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4160 : : ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4161 : : ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4162 : :
4163 : 0 : kfree(orig_data);
4164 : 0 : return 0;
4165 : :
4166 : : cantfind_ext4:
4167 [ # # ]: 0 : if (!silent)
4168 : 0 : ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4169 : : goto failed_mount;
4170 : :
4171 : : #ifdef CONFIG_QUOTA
4172 : : failed_mount8:
4173 : 0 : kobject_del(&sbi->s_kobj);
4174 : : #endif
4175 : : failed_mount7:
4176 : 0 : ext4_unregister_li_request(sb);
4177 : : failed_mount6:
4178 : 0 : ext4_mb_release(sb);
4179 : : failed_mount5:
4180 : 0 : ext4_ext_release(sb);
4181 : 0 : ext4_release_system_zone(sb);
4182 : : failed_mount4a:
4183 : 0 : dput(sb->s_root);
4184 : 0 : sb->s_root = NULL;
4185 : : failed_mount4:
4186 : 0 : ext4_msg(sb, KERN_ERR, "mount failed");
4187 [ # # ]: 0 : if (EXT4_SB(sb)->rsv_conversion_wq)
4188 : 0 : destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4189 : : failed_mount_wq:
4190 [ # # ]: 0 : if (sbi->s_journal) {
4191 : 0 : jbd2_journal_destroy(sbi->s_journal);
4192 : 0 : sbi->s_journal = NULL;
4193 : : }
4194 : : failed_mount3:
4195 : 0 : ext4_es_unregister_shrinker(sbi);
4196 : 0 : del_timer_sync(&sbi->s_err_report);
4197 [ # # ]: 0 : if (sbi->s_flex_groups)
4198 : 0 : ext4_kvfree(sbi->s_flex_groups);
4199 : 0 : percpu_counter_destroy(&sbi->s_freeclusters_counter);
4200 : 0 : percpu_counter_destroy(&sbi->s_freeinodes_counter);
4201 : 0 : percpu_counter_destroy(&sbi->s_dirs_counter);
4202 : 0 : percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4203 : 0 : percpu_counter_destroy(&sbi->s_extent_cache_cnt);
4204 [ # # ]: 0 : if (sbi->s_mmp_tsk)
4205 : 0 : kthread_stop(sbi->s_mmp_tsk);
4206 : : failed_mount2:
4207 [ # # ]: 0 : for (i = 0; i < db_count; i++)
4208 : 0 : brelse(sbi->s_group_desc[i]);
4209 : 0 : ext4_kvfree(sbi->s_group_desc);
4210 : : failed_mount:
4211 [ # # ]: 0 : if (sbi->s_chksum_driver)
4212 : : crypto_free_shash(sbi->s_chksum_driver);
4213 [ # # ]: 0 : if (sbi->s_proc) {
4214 : 0 : remove_proc_entry("options", sbi->s_proc);
4215 : 0 : remove_proc_entry(sb->s_id, ext4_proc_root);
4216 : : }
4217 : : #ifdef CONFIG_QUOTA
4218 [ # # ]: 0 : for (i = 0; i < MAXQUOTAS; i++)
4219 : 0 : kfree(sbi->s_qf_names[i]);
4220 : : #endif
4221 : : ext4_blkdev_remove(sbi);
4222 : : brelse(bh);
4223 : : out_fail:
4224 : 0 : sb->s_fs_info = NULL;
4225 : 0 : kfree(sbi->s_blockgroup_lock);
4226 : 0 : kfree(sbi);
4227 : : out_free_orig:
4228 : 0 : kfree(orig_data);
4229 [ # # ]: 0 : return err ? err : ret;
4230 : : }
4231 : :
4232 : : /*
4233 : : * Setup any per-fs journal parameters now. We'll do this both on
4234 : : * initial mount, once the journal has been initialised but before we've
4235 : : * done any recovery; and again on any subsequent remount.
4236 : : */
4237 : 0 : static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4238 : : {
4239 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
4240 : :
4241 : 4 : journal->j_commit_interval = sbi->s_commit_interval;
4242 : 4 : journal->j_min_batch_time = sbi->s_min_batch_time;
4243 : 4 : journal->j_max_batch_time = sbi->s_max_batch_time;
4244 : :
4245 : 4 : write_lock(&journal->j_state_lock);
4246 [ + - ]: 8 : if (test_opt(sb, BARRIER))
4247 : 8 : journal->j_flags |= JBD2_BARRIER;
4248 : : else
4249 : 0 : journal->j_flags &= ~JBD2_BARRIER;
4250 [ - + ]: 4 : if (test_opt(sb, DATA_ERR_ABORT))
4251 : 0 : journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4252 : : else
4253 : 4 : journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4254 : : write_unlock(&journal->j_state_lock);
4255 : 4 : }
4256 : :
4257 : 0 : static journal_t *ext4_get_journal(struct super_block *sb,
4258 : : unsigned int journal_inum)
4259 : : {
4260 : : struct inode *journal_inode;
4261 : : journal_t *journal;
4262 : :
4263 [ # # ]: 0 : BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4264 : :
4265 : : /* First, test for the existence of a valid inode on disk. Bad
4266 : : * things happen if we iget() an unused inode, as the subsequent
4267 : : * iput() will try to delete it. */
4268 : :
4269 : 0 : journal_inode = ext4_iget(sb, journal_inum);
4270 [ # # ]: 0 : if (IS_ERR(journal_inode)) {
4271 : 0 : ext4_msg(sb, KERN_ERR, "no journal found");
4272 : 0 : return NULL;
4273 : : }
4274 [ # # ]: 0 : if (!journal_inode->i_nlink) {
4275 : 0 : make_bad_inode(journal_inode);
4276 : 0 : iput(journal_inode);
4277 : 0 : ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4278 : 0 : return NULL;
4279 : : }
4280 : :
4281 : : jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4282 : : journal_inode, journal_inode->i_size);
4283 [ # # ]: 0 : if (!S_ISREG(journal_inode->i_mode)) {
4284 : 0 : ext4_msg(sb, KERN_ERR, "invalid journal inode");
4285 : 0 : iput(journal_inode);
4286 : 0 : return NULL;
4287 : : }
4288 : :
4289 : 0 : journal = jbd2_journal_init_inode(journal_inode);
4290 [ # # ]: 0 : if (!journal) {
4291 : 0 : ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4292 : 0 : iput(journal_inode);
4293 : 0 : return NULL;
4294 : : }
4295 : 0 : journal->j_private = sb;
4296 : 0 : ext4_init_journal_params(sb, journal);
4297 : 0 : return journal;
4298 : : }
4299 : :
4300 : 0 : static journal_t *ext4_get_dev_journal(struct super_block *sb,
4301 : : dev_t j_dev)
4302 : : {
4303 : : struct buffer_head *bh;
4304 : : journal_t *journal;
4305 : : ext4_fsblk_t start;
4306 : : ext4_fsblk_t len;
4307 : : int hblock, blocksize;
4308 : : ext4_fsblk_t sb_block;
4309 : : unsigned long offset;
4310 : 0 : struct ext4_super_block *es;
4311 : : struct block_device *bdev;
4312 : :
4313 [ # # ]: 0 : BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4314 : :
4315 : 0 : bdev = ext4_blkdev_get(j_dev, sb);
4316 [ # # ]: 0 : if (bdev == NULL)
4317 : : return NULL;
4318 : :
4319 : 0 : blocksize = sb->s_blocksize;
4320 : 0 : hblock = bdev_logical_block_size(bdev);
4321 [ # # ]: 0 : if (blocksize < hblock) {
4322 : 0 : ext4_msg(sb, KERN_ERR,
4323 : : "blocksize too small for journal device");
4324 : 0 : goto out_bdev;
4325 : : }
4326 : :
4327 : 0 : sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4328 : 0 : offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4329 : 0 : set_blocksize(bdev, blocksize);
4330 [ # # ]: 0 : if (!(bh = __bread(bdev, sb_block, blocksize))) {
4331 : 0 : ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4332 : : "external journal");
4333 : 0 : goto out_bdev;
4334 : : }
4335 : :
4336 : 0 : es = (struct ext4_super_block *) (bh->b_data + offset);
4337 [ # # ][ # # ]: 0 : if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4338 : 0 : !(le32_to_cpu(es->s_feature_incompat) &
4339 : : EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4340 : 0 : ext4_msg(sb, KERN_ERR, "external journal has "
4341 : : "bad superblock");
4342 : : brelse(bh);
4343 : : goto out_bdev;
4344 : : }
4345 : :
4346 [ # # ]: 0 : if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4347 : 0 : ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4348 : : brelse(bh);
4349 : : goto out_bdev;
4350 : : }
4351 : :
4352 : : len = ext4_blocks_count(es);
4353 : 0 : start = sb_block + 1;
4354 : : brelse(bh); /* we're done with the superblock */
4355 : :
4356 : 0 : journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4357 : : start, len, blocksize);
4358 [ # # ]: 0 : if (!journal) {
4359 : 0 : ext4_msg(sb, KERN_ERR, "failed to create device journal");
4360 : 0 : goto out_bdev;
4361 : : }
4362 : 0 : journal->j_private = sb;
4363 : 0 : ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4364 : 0 : wait_on_buffer(journal->j_sb_buffer);
4365 [ # # ]: 0 : if (!buffer_uptodate(journal->j_sb_buffer)) {
4366 : 0 : ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4367 : 0 : goto out_journal;
4368 : : }
4369 [ # # ][ # # ]: 0 : if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4370 [ # # ]: 0 : ext4_msg(sb, KERN_ERR, "External journal has more than one "
4371 : : "user (unsupported) - %d",
4372 : : be32_to_cpu(journal->j_superblock->s_nr_users));
4373 : 0 : goto out_journal;
4374 : : }
4375 : 0 : EXT4_SB(sb)->journal_bdev = bdev;
4376 : 0 : ext4_init_journal_params(sb, journal);
4377 : 0 : return journal;
4378 : :
4379 : : out_journal:
4380 : 0 : jbd2_journal_destroy(journal);
4381 : : out_bdev:
4382 : : ext4_blkdev_put(bdev);
4383 : 0 : return NULL;
4384 : : }
4385 : :
4386 : 0 : static int ext4_load_journal(struct super_block *sb,
4387 : : struct ext4_super_block *es,
4388 : : unsigned long journal_devnum)
4389 : : {
4390 : : journal_t *journal;
4391 : 0 : unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4392 : : dev_t journal_dev;
4393 : : int err = 0;
4394 : : int really_read_only;
4395 : :
4396 [ # # ]: 0 : BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4397 : :
4398 [ # # ][ # # ]: 0 : if (journal_devnum &&
4399 : 0 : journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4400 : 0 : ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4401 : : "numbers have changed");
4402 : 0 : journal_dev = new_decode_dev(journal_devnum);
4403 : : } else
4404 : 0 : journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4405 : :
4406 : 0 : really_read_only = bdev_read_only(sb->s_bdev);
4407 : :
4408 : : /*
4409 : : * Are we loading a blank journal or performing recovery after a
4410 : : * crash? For recovery, we need to check in advance whether we
4411 : : * can get read-write access to the device.
4412 : : */
4413 [ # # ]: 0 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4414 [ # # ]: 0 : if (sb->s_flags & MS_RDONLY) {
4415 : 0 : ext4_msg(sb, KERN_INFO, "INFO: recovery "
4416 : : "required on readonly filesystem");
4417 [ # # ]: 0 : if (really_read_only) {
4418 : 0 : ext4_msg(sb, KERN_ERR, "write access "
4419 : : "unavailable, cannot proceed");
4420 : 0 : return -EROFS;
4421 : : }
4422 : 0 : ext4_msg(sb, KERN_INFO, "write access will "
4423 : : "be enabled during recovery");
4424 : : }
4425 : : }
4426 : :
4427 [ # # ]: 0 : if (journal_inum && journal_dev) {
4428 : 0 : ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4429 : : "and inode journals!");
4430 : 0 : return -EINVAL;
4431 : : }
4432 : :
4433 [ # # ]: 0 : if (journal_inum) {
4434 [ # # ]: 0 : if (!(journal = ext4_get_journal(sb, journal_inum)))
4435 : : return -EINVAL;
4436 : : } else {
4437 [ # # ]: 0 : if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4438 : : return -EINVAL;
4439 : : }
4440 : :
4441 [ # # ]: 0 : if (!(journal->j_flags & JBD2_BARRIER))
4442 : 0 : ext4_msg(sb, KERN_INFO, "barriers disabled");
4443 : :
4444 [ # # ]: 0 : if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4445 : 0 : err = jbd2_journal_wipe(journal, !really_read_only);
4446 [ # # ]: 0 : if (!err) {
4447 : : char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4448 [ # # ]: 0 : if (save)
4449 : 0 : memcpy(save, ((char *) es) +
4450 : : EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4451 : 0 : err = jbd2_journal_load(journal);
4452 [ # # ]: 0 : if (save)
4453 : 0 : memcpy(((char *) es) + EXT4_S_ERR_START,
4454 : : save, EXT4_S_ERR_LEN);
4455 : 0 : kfree(save);
4456 : : }
4457 : :
4458 [ # # ]: 0 : if (err) {
4459 : 0 : ext4_msg(sb, KERN_ERR, "error loading journal");
4460 : 0 : jbd2_journal_destroy(journal);
4461 : 0 : return err;
4462 : : }
4463 : :
4464 : 0 : EXT4_SB(sb)->s_journal = journal;
4465 : 0 : ext4_clear_journal_err(sb, es);
4466 : :
4467 [ # # ][ # # ]: 0 : if (!really_read_only && journal_devnum &&
4468 : 0 : journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4469 : 0 : es->s_journal_dev = cpu_to_le32(journal_devnum);
4470 : :
4471 : : /* Make sure we flush the recovery flag to disk. */
4472 : 0 : ext4_commit_super(sb, 1);
4473 : : }
4474 : :
4475 : : return 0;
4476 : : }
4477 : :
4478 : 0 : static int ext4_commit_super(struct super_block *sb, int sync)
4479 : : {
4480 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4481 : 0 : struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4482 : : int error = 0;
4483 : :
4484 [ # # ][ # # ]: 0 : if (!sbh || block_device_ejected(sb))
4485 : : return error;
4486 [ # # ]: 0 : if (buffer_write_io_error(sbh)) {
4487 : : /*
4488 : : * Oh, dear. A previous attempt to write the
4489 : : * superblock failed. This could happen because the
4490 : : * USB device was yanked out. Or it could happen to
4491 : : * be a transient write error and maybe the block will
4492 : : * be remapped. Nothing we can do but to retry the
4493 : : * write and hope for the best.
4494 : : */
4495 : 0 : ext4_msg(sb, KERN_ERR, "previous I/O error to "
4496 : : "superblock detected");
4497 : : clear_buffer_write_io_error(sbh);
4498 : : set_buffer_uptodate(sbh);
4499 : : }
4500 : : /*
4501 : : * If the file system is mounted read-only, don't update the
4502 : : * superblock write time. This avoids updating the superblock
4503 : : * write time when we are mounting the root file system
4504 : : * read/only but we need to replay the journal; at that point,
4505 : : * for people who are east of GMT and who make their clock
4506 : : * tick in localtime for Windows bug-for-bug compatibility,
4507 : : * the clock is set in the future, and this will cause e2fsck
4508 : : * to complain and force a full file system check.
4509 : : */
4510 [ # # ]: 0 : if (!(sb->s_flags & MS_RDONLY))
4511 : 0 : es->s_wtime = cpu_to_le32(get_seconds());
4512 [ # # ]: 0 : if (sb->s_bdev->bd_part)
4513 : 0 : es->s_kbytes_written =
4514 [ # # ]: 0 : cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4515 : : ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4516 : : EXT4_SB(sb)->s_sectors_written_start) >> 1));
4517 : : else
4518 : 0 : es->s_kbytes_written =
4519 : 0 : cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4520 : 0 : ext4_free_blocks_count_set(es,
4521 : 0 : EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4522 : : &EXT4_SB(sb)->s_freeclusters_counter)));
4523 : 0 : es->s_free_inodes_count =
4524 : 0 : cpu_to_le32(percpu_counter_sum_positive(
4525 : : &EXT4_SB(sb)->s_freeinodes_counter));
4526 : : BUFFER_TRACE(sbh, "marking dirty");
4527 : 0 : ext4_superblock_csum_set(sb);
4528 : 0 : mark_buffer_dirty(sbh);
4529 [ # # ]: 0 : if (sync) {
4530 : 0 : error = sync_dirty_buffer(sbh);
4531 [ # # ]: 0 : if (error)
4532 : : return error;
4533 : :
4534 : : error = buffer_write_io_error(sbh);
4535 [ # # ]: 0 : if (error) {
4536 : 0 : ext4_msg(sb, KERN_ERR, "I/O error while writing "
4537 : : "superblock");
4538 : : clear_buffer_write_io_error(sbh);
4539 : : set_buffer_uptodate(sbh);
4540 : : }
4541 : : }
4542 : 0 : return error;
4543 : : }
4544 : :
4545 : : /*
4546 : : * Have we just finished recovery? If so, and if we are mounting (or
4547 : : * remounting) the filesystem readonly, then we will end up with a
4548 : : * consistent fs on disk. Record that fact.
4549 : : */
4550 : 0 : static void ext4_mark_recovery_complete(struct super_block *sb,
4551 : : struct ext4_super_block *es)
4552 : : {
4553 : 0 : journal_t *journal = EXT4_SB(sb)->s_journal;
4554 : :
4555 [ # # ]: 0 : if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4556 [ # # ]: 0 : BUG_ON(journal != NULL);
4557 : 0 : return;
4558 : : }
4559 : 0 : jbd2_journal_lock_updates(journal);
4560 [ # # ]: 0 : if (jbd2_journal_flush(journal) < 0)
4561 : : goto out;
4562 : :
4563 [ # # ][ # # ]: 0 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4564 : 0 : sb->s_flags & MS_RDONLY) {
4565 : 0 : EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4566 : 0 : ext4_commit_super(sb, 1);
4567 : : }
4568 : :
4569 : : out:
4570 : 0 : jbd2_journal_unlock_updates(journal);
4571 : : }
4572 : :
4573 : : /*
4574 : : * If we are mounting (or read-write remounting) a filesystem whose journal
4575 : : * has recorded an error from a previous lifetime, move that error to the
4576 : : * main filesystem now.
4577 : : */
4578 : 0 : static void ext4_clear_journal_err(struct super_block *sb,
4579 : : struct ext4_super_block *es)
4580 : : {
4581 : : journal_t *journal;
4582 : : int j_errno;
4583 : : const char *errstr;
4584 : :
4585 [ # # ]: 0 : BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4586 : :
4587 : 0 : journal = EXT4_SB(sb)->s_journal;
4588 : :
4589 : : /*
4590 : : * Now check for any error status which may have been recorded in the
4591 : : * journal by a prior ext4_error() or ext4_abort()
4592 : : */
4593 : :
4594 : 0 : j_errno = jbd2_journal_errno(journal);
4595 [ # # ]: 0 : if (j_errno) {
4596 : : char nbuf[16];
4597 : :
4598 : 0 : errstr = ext4_decode_error(sb, j_errno, nbuf);
4599 : 0 : ext4_warning(sb, "Filesystem error recorded "
4600 : : "from previous mount: %s", errstr);
4601 : 0 : ext4_warning(sb, "Marking fs in need of filesystem check.");
4602 : :
4603 : 0 : EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4604 : 0 : es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4605 : 0 : ext4_commit_super(sb, 1);
4606 : :
4607 : 0 : jbd2_journal_clear_err(journal);
4608 : 0 : jbd2_journal_update_sb_errno(journal);
4609 : : }
4610 : 0 : }
4611 : :
4612 : : /*
4613 : : * Force the running and committing transactions to commit,
4614 : : * and wait on the commit.
4615 : : */
4616 : 0 : int ext4_force_commit(struct super_block *sb)
4617 : : {
4618 : : journal_t *journal;
4619 : :
4620 [ + - ]: 105 : if (sb->s_flags & MS_RDONLY)
4621 : : return 0;
4622 : :
4623 : 105 : journal = EXT4_SB(sb)->s_journal;
4624 : 105 : return ext4_journal_force_commit(journal);
4625 : : }
4626 : :
4627 : 0 : static int ext4_sync_fs(struct super_block *sb, int wait)
4628 : : {
4629 : : int ret = 0;
4630 : : tid_t target;
4631 : : bool needs_barrier = false;
4632 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
4633 : :
4634 : : trace_ext4_sync_fs(sb, wait);
4635 : 5910 : flush_workqueue(sbi->rsv_conversion_wq);
4636 : : /*
4637 : : * Writeback quota in non-journalled quota case - journalled quota has
4638 : : * no dirty dquots
4639 : : */
4640 : 5916 : dquot_writeback_dquots(sb, -1);
4641 : : /*
4642 : : * Data writeback is possible w/o journal transaction, so barrier must
4643 : : * being sent at the end of the function. But we can skip it if
4644 : : * transaction_commit will do it for us.
4645 : : */
4646 : 11832 : target = jbd2_get_latest_transaction(sbi->s_journal);
4647 [ + + ]: 8874 : if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
[ + - + + ]
4648 : 2958 : !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4649 : : needs_barrier = true;
4650 : :
4651 [ + + ]: 5916 : if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4652 [ + + ]: 4145 : if (wait)
4653 : 2067 : ret = jbd2_log_wait_commit(sbi->s_journal, target);
4654 : : }
4655 [ + + ]: 5914 : if (needs_barrier) {
4656 : : int err;
4657 : 1457 : err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4658 [ + ]: 1455 : if (!ret)
4659 : : ret = err;
4660 : : }
4661 : :
4662 : 5912 : return ret;
4663 : : }
4664 : :
4665 : 0 : static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
4666 : : {
4667 : : int ret = 0;
4668 : :
4669 : : trace_ext4_sync_fs(sb, wait);
4670 : 0 : flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4671 : 0 : dquot_writeback_dquots(sb, -1);
4672 [ # # ][ # # ]: 0 : if (wait && test_opt(sb, BARRIER))
4673 : 0 : ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4674 : :
4675 : 0 : return ret;
4676 : : }
4677 : :
4678 : : /*
4679 : : * LVM calls this function before a (read-only) snapshot is created. This
4680 : : * gives us a chance to flush the journal completely and mark the fs clean.
4681 : : *
4682 : : * Note that only this function cannot bring a filesystem to be in a clean
4683 : : * state independently. It relies on upper layer to stop all data & metadata
4684 : : * modifications.
4685 : : */
4686 : 0 : static int ext4_freeze(struct super_block *sb)
4687 : : {
4688 : : int error = 0;
4689 : : journal_t *journal;
4690 : :
4691 [ # # ]: 0 : if (sb->s_flags & MS_RDONLY)
4692 : : return 0;
4693 : :
4694 : 0 : journal = EXT4_SB(sb)->s_journal;
4695 : :
4696 : : /* Now we set up the journal barrier. */
4697 : 0 : jbd2_journal_lock_updates(journal);
4698 : :
4699 : : /*
4700 : : * Don't clear the needs_recovery flag if we failed to flush
4701 : : * the journal.
4702 : : */
4703 : 0 : error = jbd2_journal_flush(journal);
4704 [ # # ]: 0 : if (error < 0)
4705 : : goto out;
4706 : :
4707 : : /* Journal blocked and flushed, clear needs_recovery flag. */
4708 : 0 : EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4709 : 0 : error = ext4_commit_super(sb, 1);
4710 : : out:
4711 : : /* we rely on upper layer to stop further updates */
4712 : 0 : jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4713 : 0 : return error;
4714 : : }
4715 : :
4716 : : /*
4717 : : * Called by LVM after the snapshot is done. We need to reset the RECOVER
4718 : : * flag here, even though the filesystem is not technically dirty yet.
4719 : : */
4720 : 0 : static int ext4_unfreeze(struct super_block *sb)
4721 : : {
4722 [ # # ]: 0 : if (sb->s_flags & MS_RDONLY)
4723 : : return 0;
4724 : :
4725 : : /* Reset the needs_recovery flag before the fs is unlocked. */
4726 : 0 : EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4727 : 0 : ext4_commit_super(sb, 1);
4728 : 0 : return 0;
4729 : : }
4730 : :
4731 : : /*
4732 : : * Structure to save mount options for ext4_remount's benefit
4733 : : */
4734 : : struct ext4_mount_options {
4735 : : unsigned long s_mount_opt;
4736 : : unsigned long s_mount_opt2;
4737 : : kuid_t s_resuid;
4738 : : kgid_t s_resgid;
4739 : : unsigned long s_commit_interval;
4740 : : u32 s_min_batch_time, s_max_batch_time;
4741 : : #ifdef CONFIG_QUOTA
4742 : : int s_jquota_fmt;
4743 : : char *s_qf_names[MAXQUOTAS];
4744 : : #endif
4745 : : };
4746 : :
4747 : 0 : static int ext4_remount(struct super_block *sb, int *flags, char *data)
4748 : : {
4749 : : struct ext4_super_block *es;
4750 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
4751 : : unsigned long old_sb_flags;
4752 : : struct ext4_mount_options old_opts;
4753 : : int enable_quota = 0;
4754 : : ext4_group_t g;
4755 : 4 : unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4756 : : int err = 0;
4757 : : #ifdef CONFIG_QUOTA
4758 : : int i, j;
4759 : : #endif
4760 : 4 : char *orig_data = kstrdup(data, GFP_KERNEL);
4761 : :
4762 : : /* Store the original options */
4763 : 4 : old_sb_flags = sb->s_flags;
4764 : 4 : old_opts.s_mount_opt = sbi->s_mount_opt;
4765 : 4 : old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4766 : 4 : old_opts.s_resuid = sbi->s_resuid;
4767 : 4 : old_opts.s_resgid = sbi->s_resgid;
4768 : 4 : old_opts.s_commit_interval = sbi->s_commit_interval;
4769 : 4 : old_opts.s_min_batch_time = sbi->s_min_batch_time;
4770 : 4 : old_opts.s_max_batch_time = sbi->s_max_batch_time;
4771 : : #ifdef CONFIG_QUOTA
4772 : 4 : old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4773 [ + + ]: 12 : for (i = 0; i < MAXQUOTAS; i++)
4774 [ - + ]: 8 : if (sbi->s_qf_names[i]) {
4775 : 0 : old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4776 : : GFP_KERNEL);
4777 [ # # ]: 0 : if (!old_opts.s_qf_names[i]) {
4778 [ # # ]: 0 : for (j = 0; j < i; j++)
4779 : 0 : kfree(old_opts.s_qf_names[j]);
4780 : 0 : kfree(orig_data);
4781 : 0 : return -ENOMEM;
4782 : : }
4783 : : } else
4784 : 8 : old_opts.s_qf_names[i] = NULL;
4785 : : #endif
4786 [ + - ][ + - ]: 4 : if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4787 : 4 : journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4788 : :
4789 : : /*
4790 : : * Allow the "check" option to be passed as a remount option.
4791 : : */
4792 [ + - ]: 4 : if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4793 : : err = -EINVAL;
4794 : : goto restore_opts;
4795 : : }
4796 : :
4797 [ - + ]: 4 : if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4798 [ # # ]: 0 : if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4799 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
4800 : : "both data=journal and delalloc");
4801 : : err = -EINVAL;
4802 : 0 : goto restore_opts;
4803 : : }
4804 [ # # ]: 0 : if (test_opt(sb, DIOREAD_NOLOCK)) {
4805 : 0 : ext4_msg(sb, KERN_ERR, "can't mount with "
4806 : : "both data=journal and dioread_nolock");
4807 : : err = -EINVAL;
4808 : 0 : goto restore_opts;
4809 : : }
4810 : : }
4811 : :
4812 [ - + ]: 4 : if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4813 : 0 : ext4_abort(sb, "Abort forced by user");
4814 : :
4815 [ + - ]: 8 : sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4816 : 8 : (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4817 : :
4818 : 4 : es = sbi->s_es;
4819 : :
4820 [ + - ]: 4 : if (sbi->s_journal) {
4821 : 4 : ext4_init_journal_params(sb, sbi->s_journal);
4822 : 4 : set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4823 : : }
4824 : :
4825 [ - + ]: 4 : if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4826 [ # # ]: 0 : if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4827 : : err = -EROFS;
4828 : : goto restore_opts;
4829 : : }
4830 : :
4831 [ # # ]: 0 : if (*flags & MS_RDONLY) {
4832 : : err = dquot_suspend(sb, -1);
4833 [ # # ]: 0 : if (err < 0)
4834 : : goto restore_opts;
4835 : :
4836 : : /*
4837 : : * First of all, the unconditional stuff we have to do
4838 : : * to disable replay of the journal when we next remount
4839 : : */
4840 : 0 : sb->s_flags |= MS_RDONLY;
4841 : :
4842 : : /*
4843 : : * OK, test if we are remounting a valid rw partition
4844 : : * readonly, and if so set the rdonly flag and then
4845 : : * mark the partition as valid again.
4846 : : */
4847 [ # # ][ # # ]: 0 : if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4848 : 0 : (sbi->s_mount_state & EXT4_VALID_FS))
4849 : 0 : es->s_state = cpu_to_le16(sbi->s_mount_state);
4850 : :
4851 [ # # ]: 0 : if (sbi->s_journal)
4852 : 0 : ext4_mark_recovery_complete(sb, es);
4853 : : } else {
4854 : : /* Make sure we can mount this feature set readwrite */
4855 [ # # ]: 0 : if (!ext4_feature_set_ok(sb, 0)) {
4856 : : err = -EROFS;
4857 : : goto restore_opts;
4858 : : }
4859 : : /*
4860 : : * Make sure the group descriptor checksums
4861 : : * are sane. If they aren't, refuse to remount r/w.
4862 : : */
4863 [ # # ]: 0 : for (g = 0; g < sbi->s_groups_count; g++) {
4864 : 0 : struct ext4_group_desc *gdp =
4865 : : ext4_get_group_desc(sb, g, NULL);
4866 : :
4867 [ # # ]: 0 : if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4868 : 0 : ext4_msg(sb, KERN_ERR,
4869 : : "ext4_remount: Checksum for group %u failed (%u!=%u)",
4870 : : g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4871 : : le16_to_cpu(gdp->bg_checksum));
4872 : : err = -EINVAL;
4873 : 0 : goto restore_opts;
4874 : : }
4875 : : }
4876 : :
4877 : : /*
4878 : : * If we have an unprocessed orphan list hanging
4879 : : * around from a previously readonly bdev mount,
4880 : : * require a full umount/remount for now.
4881 : : */
4882 [ # # ]: 0 : if (es->s_last_orphan) {
4883 : 0 : ext4_msg(sb, KERN_WARNING, "Couldn't "
4884 : : "remount RDWR because of unprocessed "
4885 : : "orphan inode list. Please "
4886 : : "umount/remount instead");
4887 : : err = -EINVAL;
4888 : 0 : goto restore_opts;
4889 : : }
4890 : :
4891 : : /*
4892 : : * Mounting a RDONLY partition read-write, so reread
4893 : : * and store the current valid flag. (It may have
4894 : : * been changed by e2fsck since we originally mounted
4895 : : * the partition.)
4896 : : */
4897 [ # # ]: 0 : if (sbi->s_journal)
4898 : 0 : ext4_clear_journal_err(sb, es);
4899 : 0 : sbi->s_mount_state = le16_to_cpu(es->s_state);
4900 [ # # ]: 0 : if (!ext4_setup_super(sb, es, 0))
4901 : 0 : sb->s_flags &= ~MS_RDONLY;
4902 [ # # ]: 0 : if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4903 : : EXT4_FEATURE_INCOMPAT_MMP))
4904 [ # # ]: 0 : if (ext4_multi_mount_protect(sb,
4905 : : le64_to_cpu(es->s_mmp_block))) {
4906 : : err = -EROFS;
4907 : : goto restore_opts;
4908 : : }
4909 : : enable_quota = 1;
4910 : : }
4911 : : }
4912 : :
4913 : : /*
4914 : : * Reinitialize lazy itable initialization thread based on
4915 : : * current settings
4916 : : */
4917 [ + - ][ - + ]: 4 : if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4918 : 0 : ext4_unregister_li_request(sb);
4919 : : else {
4920 : : ext4_group_t first_not_zeroed;
4921 : 4 : first_not_zeroed = ext4_has_uninit_itable(sb);
4922 : 4 : ext4_register_li_request(sb, first_not_zeroed);
4923 : : }
4924 : :
4925 : 4 : ext4_setup_system_zone(sb);
4926 [ - + ][ # # ]: 4 : if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4927 : 4 : ext4_commit_super(sb, 1);
4928 : :
4929 : : #ifdef CONFIG_QUOTA
4930 : : /* Release old quota file names */
4931 [ + + ]: 12 : for (i = 0; i < MAXQUOTAS; i++)
4932 : 8 : kfree(old_opts.s_qf_names[i]);
4933 [ - + ]: 4 : if (enable_quota) {
4934 [ # # ]: 0 : if (sb_any_quota_suspended(sb))
4935 : 0 : dquot_resume(sb, -1);
4936 [ # # ]: 0 : else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4937 : : EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4938 : 0 : err = ext4_enable_quotas(sb);
4939 [ # # ]: 0 : if (err)
4940 : : goto restore_opts;
4941 : : }
4942 : : }
4943 : : #endif
4944 : :
4945 : 4 : ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4946 : 4 : kfree(orig_data);
4947 : 4 : return 0;
4948 : :
4949 : : restore_opts:
4950 : 0 : sb->s_flags = old_sb_flags;
4951 : 0 : sbi->s_mount_opt = old_opts.s_mount_opt;
4952 : 0 : sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4953 : 0 : sbi->s_resuid = old_opts.s_resuid;
4954 : 0 : sbi->s_resgid = old_opts.s_resgid;
4955 : 0 : sbi->s_commit_interval = old_opts.s_commit_interval;
4956 : 0 : sbi->s_min_batch_time = old_opts.s_min_batch_time;
4957 : 0 : sbi->s_max_batch_time = old_opts.s_max_batch_time;
4958 : : #ifdef CONFIG_QUOTA
4959 : 0 : sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4960 [ # # ]: 0 : for (i = 0; i < MAXQUOTAS; i++) {
4961 : 0 : kfree(sbi->s_qf_names[i]);
4962 : 0 : sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4963 : : }
4964 : : #endif
4965 : 0 : kfree(orig_data);
4966 : 0 : return err;
4967 : : }
4968 : :
4969 : 0 : static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4970 : : {
4971 : 19917 : struct super_block *sb = dentry->d_sb;
4972 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
4973 : 79668 : struct ext4_super_block *es = sbi->s_es;
4974 : : ext4_fsblk_t overhead = 0, resv_blocks;
4975 : : u64 fsid;
4976 : : s64 bfree;
4977 : 39834 : resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
4978 : :
4979 [ + - ]: 19917 : if (!test_opt(sb, MINIX_DF))
4980 : 19917 : overhead = sbi->s_overhead;
4981 : :
4982 : 19917 : buf->f_type = EXT4_SUPER_MAGIC;
4983 : 19917 : buf->f_bsize = sb->s_blocksize;
4984 : 19917 : buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
4985 : 39834 : bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4986 : 19917 : percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4987 : : /* prevent underflow in case that few free space is available */
4988 : 19917 : buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
4989 : 19917 : buf->f_bavail = buf->f_bfree -
4990 : 19917 : (ext4_r_blocks_count(es) + resv_blocks);
4991 [ - + ]: 19917 : if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
4992 : 0 : buf->f_bavail = 0;
4993 : 19917 : buf->f_files = le32_to_cpu(es->s_inodes_count);
4994 : 39834 : buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4995 : 19917 : buf->f_namelen = EXT4_NAME_LEN;
4996 : 39834 : fsid = le64_to_cpup((void *)es->s_uuid) ^
4997 : 19917 : le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4998 : 19917 : buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4999 : 19917 : buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5000 : :
5001 : 19917 : return 0;
5002 : : }
5003 : :
5004 : : /* Helper function for writing quotas on sync - we need to start transaction
5005 : : * before quota file is locked for write. Otherwise the are possible deadlocks:
5006 : : * Process 1 Process 2
5007 : : * ext4_create() quota_sync()
5008 : : * jbd2_journal_start() write_dquot()
5009 : : * dquot_initialize() down(dqio_mutex)
5010 : : * down(dqio_mutex) jbd2_journal_start()
5011 : : *
5012 : : */
5013 : :
5014 : : #ifdef CONFIG_QUOTA
5015 : :
5016 : : static inline struct inode *dquot_to_inode(struct dquot *dquot)
5017 : : {
5018 : 0 : return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5019 : : }
5020 : :
5021 : 0 : static int ext4_write_dquot(struct dquot *dquot)
5022 : : {
5023 : : int ret, err;
5024 : : handle_t *handle;
5025 : 0 : struct inode *inode;
5026 : :
5027 : : inode = dquot_to_inode(dquot);
5028 [ # # ][ # # ]: 0 : handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5029 : : EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5030 [ # # ]: 0 : if (IS_ERR(handle))
5031 : 0 : return PTR_ERR(handle);
5032 : 0 : ret = dquot_commit(dquot);
5033 : 0 : err = ext4_journal_stop(handle);
5034 [ # # ]: 0 : if (!ret)
5035 : : ret = err;
5036 : 0 : return ret;
5037 : : }
5038 : :
5039 : 0 : static int ext4_acquire_dquot(struct dquot *dquot)
5040 : : {
5041 : : int ret, err;
5042 : : handle_t *handle;
5043 : :
5044 [ # # ][ # # ]: 0 : handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
[ # # ]
5045 : : EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5046 [ # # ]: 0 : if (IS_ERR(handle))
5047 : 0 : return PTR_ERR(handle);
5048 : 0 : ret = dquot_acquire(dquot);
5049 : 0 : err = ext4_journal_stop(handle);
5050 [ # # ]: 0 : if (!ret)
5051 : : ret = err;
5052 : 0 : return ret;
5053 : : }
5054 : :
5055 : 0 : static int ext4_release_dquot(struct dquot *dquot)
5056 : : {
5057 : : int ret, err;
5058 : : handle_t *handle;
5059 : :
5060 [ # # ][ # # ]: 0 : handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5061 : : EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
5062 [ # # ]: 0 : if (IS_ERR(handle)) {
5063 : : /* Release dquot anyway to avoid endless cycle in dqput() */
5064 : 0 : dquot_release(dquot);
5065 : 0 : return PTR_ERR(handle);
5066 : : }
5067 : 0 : ret = dquot_release(dquot);
5068 : 0 : err = ext4_journal_stop(handle);
5069 [ # # ]: 0 : if (!ret)
5070 : : ret = err;
5071 : 0 : return ret;
5072 : : }
5073 : :
5074 : 0 : static int ext4_mark_dquot_dirty(struct dquot *dquot)
5075 : : {
5076 : 0 : struct super_block *sb = dquot->dq_sb;
5077 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
5078 : :
5079 : : /* Are we journaling quotas? */
5080 [ # # ][ # # ]: 0 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5081 [ # # ]: 0 : sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5082 : 0 : dquot_mark_dquot_dirty(dquot);
5083 : 0 : return ext4_write_dquot(dquot);
5084 : : } else {
5085 : 0 : return dquot_mark_dquot_dirty(dquot);
5086 : : }
5087 : : }
5088 : :
5089 : 0 : static int ext4_write_info(struct super_block *sb, int type)
5090 : : {
5091 : : int ret, err;
5092 : : handle_t *handle;
5093 : :
5094 : : /* Data block + inode block */
5095 : 0 : handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
5096 [ # # ]: 0 : if (IS_ERR(handle))
5097 : 0 : return PTR_ERR(handle);
5098 : 0 : ret = dquot_commit_info(sb, type);
5099 : 0 : err = ext4_journal_stop(handle);
5100 [ # # ]: 0 : if (!ret)
5101 : : ret = err;
5102 : 0 : return ret;
5103 : : }
5104 : :
5105 : : /*
5106 : : * Turn on quotas during mount time - we need to find
5107 : : * the quota file and such...
5108 : : */
5109 : : static int ext4_quota_on_mount(struct super_block *sb, int type)
5110 : : {
5111 : 0 : return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5112 : : EXT4_SB(sb)->s_jquota_fmt, type);
5113 : : }
5114 : :
5115 : : /*
5116 : : * Standard function to be called on quota_on
5117 : : */
5118 : 0 : static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5119 : : struct path *path)
5120 : : {
5121 : : int err;
5122 : :
5123 [ # # ]: 0 : if (!test_opt(sb, QUOTA))
5124 : : return -EINVAL;
5125 : :
5126 : : /* Quotafile not on the same filesystem? */
5127 [ # # ]: 0 : if (path->dentry->d_sb != sb)
5128 : : return -EXDEV;
5129 : : /* Journaling quota? */
5130 [ # # ]: 0 : if (EXT4_SB(sb)->s_qf_names[type]) {
5131 : : /* Quotafile not in fs root? */
5132 [ # # ]: 0 : if (path->dentry->d_parent != sb->s_root)
5133 : 0 : ext4_msg(sb, KERN_WARNING,
5134 : : "Quota file not on filesystem root. "
5135 : : "Journaled quota will not work");
5136 : : }
5137 : :
5138 : : /*
5139 : : * When we journal data on quota file, we have to flush journal to see
5140 : : * all updates to the file when we bypass pagecache...
5141 : : */
5142 [ # # ][ # # ]: 0 : if (EXT4_SB(sb)->s_journal &&
5143 : 0 : ext4_should_journal_data(path->dentry->d_inode)) {
5144 : : /*
5145 : : * We don't need to lock updates but journal_flush() could
5146 : : * otherwise be livelocked...
5147 : : */
5148 : 0 : jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5149 : 0 : err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5150 : 0 : jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5151 [ # # ]: 0 : if (err)
5152 : : return err;
5153 : : }
5154 : :
5155 : 0 : return dquot_quota_on(sb, type, format_id, path);
5156 : : }
5157 : :
5158 : 0 : static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5159 : : unsigned int flags)
5160 : : {
5161 : : int err;
5162 : : struct inode *qf_inode;
5163 : 0 : unsigned long qf_inums[MAXQUOTAS] = {
5164 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5165 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5166 : : };
5167 : :
5168 [ # # ]: 0 : BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5169 : :
5170 [ # # ]: 0 : if (!qf_inums[type])
5171 : : return -EPERM;
5172 : :
5173 : 0 : qf_inode = ext4_iget(sb, qf_inums[type]);
5174 [ # # ]: 0 : if (IS_ERR(qf_inode)) {
5175 : 0 : ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5176 : 0 : return PTR_ERR(qf_inode);
5177 : : }
5178 : :
5179 : : /* Don't account quota for quota files to avoid recursion */
5180 : 0 : qf_inode->i_flags |= S_NOQUOTA;
5181 : 0 : err = dquot_enable(qf_inode, type, format_id, flags);
5182 : 0 : iput(qf_inode);
5183 : :
5184 : 0 : return err;
5185 : : }
5186 : :
5187 : : /* Enable usage tracking for all quota types. */
5188 : 0 : static int ext4_enable_quotas(struct super_block *sb)
5189 : : {
5190 : : int type, err = 0;
5191 : 0 : unsigned long qf_inums[MAXQUOTAS] = {
5192 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5193 : 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5194 : : };
5195 : :
5196 : 0 : sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
5197 [ # # ]: 0 : for (type = 0; type < MAXQUOTAS; type++) {
5198 [ # # ]: 0 : if (qf_inums[type]) {
5199 : 0 : err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5200 : : DQUOT_USAGE_ENABLED);
5201 [ # # ]: 0 : if (err) {
5202 : 0 : ext4_warning(sb,
5203 : : "Failed to enable quota tracking "
5204 : : "(type=%d, err=%d). Please run "
5205 : : "e2fsck to fix.", type, err);
5206 : 0 : return err;
5207 : : }
5208 : : }
5209 : : }
5210 : : return 0;
5211 : : }
5212 : :
5213 : : /*
5214 : : * quota_on function that is used when QUOTA feature is set.
5215 : : */
5216 : 0 : static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5217 : : int format_id)
5218 : : {
5219 [ # # ]: 0 : if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5220 : : return -EINVAL;
5221 : :
5222 : : /*
5223 : : * USAGE was enabled at mount time. Only need to enable LIMITS now.
5224 : : */
5225 : 0 : return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5226 : : }
5227 : :
5228 : 0 : static int ext4_quota_off(struct super_block *sb, int type)
5229 : : {
5230 : 0 : struct inode *inode = sb_dqopt(sb)->files[type];
5231 : : handle_t *handle;
5232 : :
5233 : : /* Force all delayed allocation blocks to be allocated.
5234 : : * Caller already holds s_umount sem */
5235 [ # # ]: 0 : if (test_opt(sb, DELALLOC))
5236 : 0 : sync_filesystem(sb);
5237 : :
5238 [ # # ]: 0 : if (!inode)
5239 : : goto out;
5240 : :
5241 : : /* Update modification times of quota files when userspace can
5242 : : * start looking at them */
5243 : : handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5244 [ # # ]: 0 : if (IS_ERR(handle))
5245 : : goto out;
5246 : 0 : inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5247 : 0 : ext4_mark_inode_dirty(handle, inode);
5248 : 0 : ext4_journal_stop(handle);
5249 : :
5250 : : out:
5251 : 0 : return dquot_quota_off(sb, type);
5252 : : }
5253 : :
5254 : : /*
5255 : : * quota_off function that is used when QUOTA feature is set.
5256 : : */
5257 : 0 : static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5258 : : {
5259 [ # # ]: 0 : if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5260 : : return -EINVAL;
5261 : :
5262 : : /* Disable only the limits. */
5263 : 0 : return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5264 : : }
5265 : :
5266 : : /* Read data from quotafile - avoid pagecache and such because we cannot afford
5267 : : * acquiring the locks... As quota files are never truncated and quota code
5268 : : * itself serializes the operations (and no one else should touch the files)
5269 : : * we don't have to be afraid of races */
5270 : 0 : static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5271 : : size_t len, loff_t off)
5272 : : {
5273 : 0 : struct inode *inode = sb_dqopt(sb)->files[type];
5274 : 0 : ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5275 : 0 : int err = 0;
5276 : 0 : int offset = off & (sb->s_blocksize - 1);
5277 : : int tocopy;
5278 : : size_t toread;
5279 : : struct buffer_head *bh;
5280 : : loff_t i_size = i_size_read(inode);
5281 : :
5282 [ # # ]: 0 : if (off > i_size)
5283 : : return 0;
5284 [ # # ]: 0 : if (off+len > i_size)
5285 : 0 : len = i_size-off;
5286 : : toread = len;
5287 [ # # ]: 0 : while (toread > 0) {
5288 : : tocopy = sb->s_blocksize - offset < toread ?
5289 : 0 : sb->s_blocksize - offset : toread;
5290 : 0 : bh = ext4_bread(NULL, inode, blk, 0, &err);
5291 [ # # ]: 0 : if (err)
5292 : : return err;
5293 [ # # ]: 0 : if (!bh) /* A hole? */
5294 [ # # ]: 0 : memset(data, 0, tocopy);
5295 : : else
5296 : 0 : memcpy(data, bh->b_data+offset, tocopy);
5297 : : brelse(bh);
5298 : : offset = 0;
5299 : 0 : toread -= tocopy;
5300 : 0 : data += tocopy;
5301 : 0 : blk++;
5302 : : }
5303 : 0 : return len;
5304 : : }
5305 : :
5306 : : /* Write to quotafile (we know the transaction is already started and has
5307 : : * enough credits) */
5308 : 0 : static ssize_t ext4_quota_write(struct super_block *sb, int type,
5309 : : const char *data, size_t len, loff_t off)
5310 : : {
5311 : 0 : struct inode *inode = sb_dqopt(sb)->files[type];
5312 : 0 : ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5313 : 0 : int err = 0;
5314 : 0 : int offset = off & (sb->s_blocksize - 1);
5315 : : struct buffer_head *bh;
5316 : : handle_t *handle = journal_current_handle();
5317 : :
5318 [ # # ][ # # ]: 0 : if (EXT4_SB(sb)->s_journal && !handle) {
5319 : 0 : ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5320 : : " cancelled because transaction is not started",
5321 : : (unsigned long long)off, (unsigned long long)len);
5322 : 0 : return -EIO;
5323 : : }
5324 : : /*
5325 : : * Since we account only one data block in transaction credits,
5326 : : * then it is impossible to cross a block boundary.
5327 : : */
5328 [ # # ]: 0 : if (sb->s_blocksize - offset < len) {
5329 : 0 : ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5330 : : " cancelled because not block aligned",
5331 : : (unsigned long long)off, (unsigned long long)len);
5332 : 0 : return -EIO;
5333 : : }
5334 : :
5335 : 0 : bh = ext4_bread(handle, inode, blk, 1, &err);
5336 [ # # ]: 0 : if (!bh)
5337 : : goto out;
5338 : 0 : err = ext4_journal_get_write_access(handle, bh);
5339 [ # # ]: 0 : if (err) {
5340 : : brelse(bh);
5341 : : goto out;
5342 : : }
5343 : : lock_buffer(bh);
5344 : 0 : memcpy(bh->b_data+offset, data, len);
5345 : 0 : flush_dcache_page(bh->b_page);
5346 : 0 : unlock_buffer(bh);
5347 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
5348 : : brelse(bh);
5349 : : out:
5350 [ # # ]: 0 : if (err)
5351 : : return err;
5352 [ # # ]: 0 : if (inode->i_size < off + len) {
5353 : : i_size_write(inode, off + len);
5354 : 0 : EXT4_I(inode)->i_disksize = inode->i_size;
5355 : 0 : ext4_mark_inode_dirty(handle, inode);
5356 : : }
5357 : 0 : return len;
5358 : : }
5359 : :
5360 : : #endif
5361 : :
5362 : 0 : static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5363 : : const char *dev_name, void *data)
5364 : : {
5365 : 0 : return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5366 : : }
5367 : :
5368 : : #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5369 : : static inline void register_as_ext2(void)
5370 : : {
5371 : : int err = register_filesystem(&ext2_fs_type);
5372 : : if (err)
5373 : : printk(KERN_WARNING
5374 : : "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5375 : : }
5376 : :
5377 : : static inline void unregister_as_ext2(void)
5378 : : {
5379 : : unregister_filesystem(&ext2_fs_type);
5380 : : }
5381 : :
5382 : : static inline int ext2_feature_set_ok(struct super_block *sb)
5383 : : {
5384 : : if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5385 : : return 0;
5386 : : if (sb->s_flags & MS_RDONLY)
5387 : : return 1;
5388 : : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5389 : : return 0;
5390 : : return 1;
5391 : : }
5392 : : #else
5393 : : static inline void register_as_ext2(void) { }
5394 : : static inline void unregister_as_ext2(void) { }
5395 : : static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5396 : : #endif
5397 : :
5398 : : #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5399 : : static inline void register_as_ext3(void)
5400 : : {
5401 : : int err = register_filesystem(&ext3_fs_type);
5402 : : if (err)
5403 : : printk(KERN_WARNING
5404 : : "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5405 : : }
5406 : :
5407 : : static inline void unregister_as_ext3(void)
5408 : : {
5409 : : unregister_filesystem(&ext3_fs_type);
5410 : : }
5411 : :
5412 : : static inline int ext3_feature_set_ok(struct super_block *sb)
5413 : : {
5414 : : if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5415 : : return 0;
5416 : : if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5417 : : return 0;
5418 : : if (sb->s_flags & MS_RDONLY)
5419 : : return 1;
5420 : : if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5421 : : return 0;
5422 : : return 1;
5423 : : }
5424 : : #else
5425 : : static inline void register_as_ext3(void) { }
5426 : : static inline void unregister_as_ext3(void) { }
5427 : : static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5428 : : #endif
5429 : :
5430 : : static struct file_system_type ext4_fs_type = {
5431 : : .owner = THIS_MODULE,
5432 : : .name = "ext4",
5433 : : .mount = ext4_mount,
5434 : : .kill_sb = kill_block_super,
5435 : : .fs_flags = FS_REQUIRES_DEV,
5436 : : };
5437 : : MODULE_ALIAS_FS("ext4");
5438 : :
5439 : 0 : static int __init ext4_init_feat_adverts(void)
5440 : : {
5441 : : struct ext4_features *ef;
5442 : : int ret = -ENOMEM;
5443 : :
5444 : : ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5445 [ # # ]: 0 : if (!ef)
5446 : : goto out;
5447 : :
5448 : 0 : ef->f_kobj.kset = ext4_kset;
5449 : : init_completion(&ef->f_kobj_unregister);
5450 : 0 : ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5451 : : "features");
5452 [ # # ]: 0 : if (ret) {
5453 : 0 : kfree(ef);
5454 : 0 : goto out;
5455 : : }
5456 : :
5457 : 0 : ext4_feat = ef;
5458 : : ret = 0;
5459 : : out:
5460 : 0 : return ret;
5461 : : }
5462 : :
5463 : 0 : static void ext4_exit_feat_adverts(void)
5464 : : {
5465 : 0 : kobject_put(&ext4_feat->f_kobj);
5466 : 0 : wait_for_completion(&ext4_feat->f_kobj_unregister);
5467 : 0 : kfree(ext4_feat);
5468 : 0 : }
5469 : :
5470 : : /* Shared across all ext4 file systems */
5471 : : wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5472 : : struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5473 : :
5474 : 0 : static int __init ext4_init_fs(void)
5475 : : {
5476 : : int i, err;
5477 : :
5478 : 0 : ext4_li_info = NULL;
5479 : 0 : mutex_init(&ext4_li_mtx);
5480 : :
5481 : : /* Build-time check for flags consistency */
5482 : : ext4_check_flag_values();
5483 : :
5484 [ # # ]: 0 : for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5485 : 0 : mutex_init(&ext4__aio_mutex[i]);
5486 : 0 : init_waitqueue_head(&ext4__ioend_wq[i]);
5487 : : }
5488 : :
5489 : 0 : err = ext4_init_es();
5490 [ # # ]: 0 : if (err)
5491 : : return err;
5492 : :
5493 : 0 : err = ext4_init_pageio();
5494 [ # # ]: 0 : if (err)
5495 : : goto out7;
5496 : :
5497 : 0 : err = ext4_init_system_zone();
5498 [ # # ]: 0 : if (err)
5499 : : goto out6;
5500 : 0 : ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5501 [ # # ]: 0 : if (!ext4_kset) {
5502 : : err = -ENOMEM;
5503 : : goto out5;
5504 : : }
5505 : 0 : ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5506 : :
5507 : 0 : err = ext4_init_feat_adverts();
5508 [ # # ]: 0 : if (err)
5509 : : goto out4;
5510 : :
5511 : 0 : err = ext4_init_mballoc();
5512 [ # # ]: 0 : if (err)
5513 : : goto out3;
5514 : :
5515 : 0 : err = ext4_init_xattr();
5516 [ # # ]: 0 : if (err)
5517 : : goto out2;
5518 : 0 : err = init_inodecache();
5519 [ # # ]: 0 : if (err)
5520 : : goto out1;
5521 : : register_as_ext3();
5522 : : register_as_ext2();
5523 : 0 : err = register_filesystem(&ext4_fs_type);
5524 [ # # ]: 0 : if (err)
5525 : : goto out;
5526 : :
5527 : : return 0;
5528 : : out:
5529 : : unregister_as_ext2();
5530 : : unregister_as_ext3();
5531 : : destroy_inodecache();
5532 : : out1:
5533 : 0 : ext4_exit_xattr();
5534 : : out2:
5535 : 0 : ext4_exit_mballoc();
5536 : : out3:
5537 : 0 : ext4_exit_feat_adverts();
5538 : : out4:
5539 [ # # ]: 0 : if (ext4_proc_root)
5540 : 0 : remove_proc_entry("fs/ext4", NULL);
5541 : 0 : kset_unregister(ext4_kset);
5542 : : out5:
5543 : 0 : ext4_exit_system_zone();
5544 : : out6:
5545 : 0 : ext4_exit_pageio();
5546 : : out7:
5547 : 0 : ext4_exit_es();
5548 : :
5549 : 0 : return err;
5550 : : }
5551 : :
5552 : 0 : static void __exit ext4_exit_fs(void)
5553 : : {
5554 : 0 : ext4_destroy_lazyinit_thread();
5555 : : unregister_as_ext2();
5556 : : unregister_as_ext3();
5557 : 0 : unregister_filesystem(&ext4_fs_type);
5558 : : destroy_inodecache();
5559 : 0 : ext4_exit_xattr();
5560 : 0 : ext4_exit_mballoc();
5561 : 0 : ext4_exit_feat_adverts();
5562 : 0 : remove_proc_entry("fs/ext4", NULL);
5563 : 0 : kset_unregister(ext4_kset);
5564 : 0 : ext4_exit_system_zone();
5565 : 0 : ext4_exit_pageio();
5566 : 0 : ext4_exit_es();
5567 : 0 : }
5568 : :
5569 : : MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5570 : : MODULE_DESCRIPTION("Fourth Extended Filesystem");
5571 : : MODULE_LICENSE("GPL");
5572 : : module_init(ext4_init_fs)
5573 : : module_exit(ext4_exit_fs)
|
