Branch data Line data Source code
1 : : /*
2 : : * linux/fs/ext4/ialloc.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 : : * BSD ufs-inspired inode and directory allocation by
10 : : * Stephen Tweedie (sct@redhat.com), 1993
11 : : * Big-endian to little-endian byte-swapping/bitmaps by
12 : : * David S. Miller (davem@caip.rutgers.edu), 1995
13 : : */
14 : :
15 : : #include <linux/time.h>
16 : : #include <linux/fs.h>
17 : : #include <linux/jbd2.h>
18 : : #include <linux/stat.h>
19 : : #include <linux/string.h>
20 : : #include <linux/quotaops.h>
21 : : #include <linux/buffer_head.h>
22 : : #include <linux/random.h>
23 : : #include <linux/bitops.h>
24 : : #include <linux/blkdev.h>
25 : : #include <asm/byteorder.h>
26 : :
27 : : #include "ext4.h"
28 : : #include "ext4_jbd2.h"
29 : : #include "xattr.h"
30 : : #include "acl.h"
31 : :
32 : : #include <trace/events/ext4.h>
33 : :
34 : : /*
35 : : * ialloc.c contains the inodes allocation and deallocation routines
36 : : */
37 : :
38 : : /*
39 : : * The free inodes are managed by bitmaps. A file system contains several
40 : : * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
41 : : * block for inodes, N blocks for the inode table and data blocks.
42 : : *
43 : : * The file system contains group descriptors which are located after the
44 : : * super block. Each descriptor contains the number of the bitmap block and
45 : : * the free blocks count in the block.
46 : : */
47 : :
48 : : /*
49 : : * To avoid calling the atomic setbit hundreds or thousands of times, we only
50 : : * need to use it within a single byte (to ensure we get endianness right).
51 : : * We can use memset for the rest of the bitmap as there are no other users.
52 : : */
53 : 0 : void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap)
54 : : {
55 : : int i;
56 : :
57 [ + ]: 86 : if (start_bit >= end_bit)
58 : 0 : return;
59 : :
60 : : ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit);
61 [ - + ]: 4 : for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++)
62 : : ext4_set_bit(i, bitmap);
63 [ + - ]: 4 : if (i < end_bit)
64 [ + - ]: 4 : memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3);
65 : : }
66 : :
67 : : /* Initializes an uninitialized inode bitmap */
68 : 0 : static unsigned ext4_init_inode_bitmap(struct super_block *sb,
69 : : struct buffer_head *bh,
70 : : ext4_group_t block_group,
71 : : struct ext4_group_desc *gdp)
72 : : {
73 : : struct ext4_group_info *grp;
74 [ - + ]: 4 : J_ASSERT_BH(bh, buffer_locked(bh));
75 : :
76 : : /* If checksum is bad mark all blocks and inodes use to prevent
77 : : * allocation, essentially implementing a per-group read-only flag. */
78 [ - + ]: 4 : if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) {
79 : 0 : ext4_error(sb, "Checksum bad for group %u", block_group);
80 : : grp = ext4_get_group_info(sb, block_group);
81 : 0 : set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
82 : 0 : set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
83 : 0 : return 0;
84 : : }
85 : :
86 [ + - ]: 4 : memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8);
87 : 4 : ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), sb->s_blocksize * 8,
88 : : bh->b_data);
89 : 4 : ext4_inode_bitmap_csum_set(sb, block_group, gdp, bh,
90 : 4 : EXT4_INODES_PER_GROUP(sb) / 8);
91 : 4 : ext4_group_desc_csum_set(sb, block_group, gdp);
92 : :
93 : 4 : return EXT4_INODES_PER_GROUP(sb);
94 : : }
95 : :
96 : 0 : void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate)
97 : : {
98 [ + - ]: 66 : if (uptodate) {
99 : : set_buffer_uptodate(bh);
100 : : set_bitmap_uptodate(bh);
101 : : }
102 : 66 : unlock_buffer(bh);
103 : : put_bh(bh);
104 : 66 : }
105 : :
106 : : /*
107 : : * Read the inode allocation bitmap for a given block_group, reading
108 : : * into the specified slot in the superblock's bitmap cache.
109 : : *
110 : : * Return buffer_head of bitmap on success or NULL.
111 : : */
112 : : static struct buffer_head *
113 : 0 : ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
114 : : {
115 : : struct ext4_group_desc *desc;
116 : : struct buffer_head *bh = NULL;
117 : : ext4_fsblk_t bitmap_blk;
118 : : struct ext4_group_info *grp;
119 : :
120 : 923464 : desc = ext4_get_group_desc(sb, block_group, NULL);
121 [ + - ]: 923463 : if (!desc)
122 : : return NULL;
123 : :
124 : 923463 : bitmap_blk = ext4_inode_bitmap(sb, desc);
125 : : bh = sb_getblk(sb, bitmap_blk);
126 [ - + ]: 923463 : if (unlikely(!bh)) {
127 : 0 : ext4_error(sb, "Cannot read inode bitmap - "
128 : : "block_group = %u, inode_bitmap = %llu",
129 : : block_group, bitmap_blk);
130 : 0 : return NULL;
131 : : }
132 [ + + ]: 923463 : if (bitmap_uptodate(bh))
133 : : goto verify;
134 : :
135 : : lock_buffer(bh);
136 [ + + ]: 31 : if (bitmap_uptodate(bh)) {
137 : 9 : unlock_buffer(bh);
138 : 9 : goto verify;
139 : : }
140 : :
141 : : ext4_lock_group(sb, block_group);
142 [ + + ]: 22 : if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
143 : 4 : ext4_init_inode_bitmap(sb, bh, block_group, desc);
144 : : set_bitmap_uptodate(bh);
145 : : set_buffer_uptodate(bh);
146 : : set_buffer_verified(bh);
147 : : ext4_unlock_group(sb, block_group);
148 : 4 : unlock_buffer(bh);
149 : 4 : return bh;
150 : : }
151 : : ext4_unlock_group(sb, block_group);
152 : :
153 [ - + ]: 18 : if (buffer_uptodate(bh)) {
154 : : /*
155 : : * if not uninit if bh is uptodate,
156 : : * bitmap is also uptodate
157 : : */
158 : : set_bitmap_uptodate(bh);
159 : 0 : unlock_buffer(bh);
160 : 0 : goto verify;
161 : : }
162 : : /*
163 : : * submit the buffer_head for reading
164 : : */
165 : : trace_ext4_load_inode_bitmap(sb, block_group);
166 : 18 : bh->b_end_io = ext4_end_bitmap_read;
167 : : get_bh(bh);
168 : 18 : submit_bh(READ | REQ_META | REQ_PRIO, bh);
169 : : wait_on_buffer(bh);
170 [ - + ]: 18 : if (!buffer_uptodate(bh)) {
171 : : put_bh(bh);
172 : 0 : ext4_error(sb, "Cannot read inode bitmap - "
173 : : "block_group = %u, inode_bitmap = %llu",
174 : : block_group, bitmap_blk);
175 : 0 : return NULL;
176 : : }
177 : :
178 : : verify:
179 : : ext4_lock_group(sb, block_group);
180 [ + + - + ]: 923478 : if (!buffer_verified(bh) &&
181 : 18 : !ext4_inode_bitmap_csum_verify(sb, block_group, desc, bh,
182 : 18 : EXT4_INODES_PER_GROUP(sb) / 8)) {
183 : : ext4_unlock_group(sb, block_group);
184 : : put_bh(bh);
185 : 0 : ext4_error(sb, "Corrupt inode bitmap - block_group = %u, "
186 : : "inode_bitmap = %llu", block_group, bitmap_blk);
187 : : grp = ext4_get_group_info(sb, block_group);
188 : 0 : set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
189 : 0 : return NULL;
190 : : }
191 : : ext4_unlock_group(sb, block_group);
192 : : set_buffer_verified(bh);
193 : 923460 : return bh;
194 : : }
195 : :
196 : : /*
197 : : * NOTE! When we get the inode, we're the only people
198 : : * that have access to it, and as such there are no
199 : : * race conditions we have to worry about. The inode
200 : : * is not on the hash-lists, and it cannot be reached
201 : : * through the filesystem because the directory entry
202 : : * has been deleted earlier.
203 : : *
204 : : * HOWEVER: we must make sure that we get no aliases,
205 : : * which means that we have to call "clear_inode()"
206 : : * _before_ we mark the inode not in use in the inode
207 : : * bitmaps. Otherwise a newly created file might use
208 : : * the same inode number (not actually the same pointer
209 : : * though), and then we'd have two inodes sharing the
210 : : * same inode number and space on the harddisk.
211 : : */
212 : 0 : void ext4_free_inode(handle_t *handle, struct inode *inode)
213 : : {
214 : 1832180 : struct super_block *sb = inode->i_sb;
215 : : int is_directory;
216 : : unsigned long ino;
217 : : struct buffer_head *bitmap_bh = NULL;
218 : : struct buffer_head *bh2;
219 : : ext4_group_t block_group;
220 : : unsigned long bit;
221 : : struct ext4_group_desc *gdp;
222 : : struct ext4_super_block *es;
223 : : struct ext4_sb_info *sbi;
224 : : int fatal = 0, err, count, cleared;
225 : : struct ext4_group_info *grp;
226 : :
227 [ - + ]: 458043 : if (!sb) {
228 : 0 : printk(KERN_ERR "EXT4-fs: %s:%d: inode on "
229 : : "nonexistent device\n", __func__, __LINE__);
230 : 0 : return;
231 : : }
232 [ - + ]: 458043 : if (atomic_read(&inode->i_count) > 1) {
233 : 0 : ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: count=%d",
234 : : __func__, __LINE__, inode->i_ino,
235 : : atomic_read(&inode->i_count));
236 : 0 : return;
237 : : }
238 [ - + ]: 458043 : if (inode->i_nlink) {
239 : 0 : ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: nlink=%d\n",
240 : : __func__, __LINE__, inode->i_ino, inode->i_nlink);
241 : 0 : return;
242 : : }
243 : : sbi = EXT4_SB(sb);
244 : :
245 : 458043 : ino = inode->i_ino;
246 : : ext4_debug("freeing inode %lu\n", ino);
247 : : trace_ext4_free_inode(inode);
248 : :
249 : : /*
250 : : * Note: we must free any quota before locking the superblock,
251 : : * as writing the quota to disk may need the lock as well.
252 : : */
253 : 458043 : dquot_initialize(inode);
254 : 458046 : ext4_xattr_delete_inode(handle, inode);
255 : 458045 : dquot_free_inode(inode);
256 : 458047 : dquot_drop(inode);
257 : :
258 : 458037 : is_directory = S_ISDIR(inode->i_mode);
259 : :
260 : : /* Do this BEFORE marking the inode not in use or returning an error */
261 : 458037 : ext4_clear_inode(inode);
262 : :
263 : 458047 : es = EXT4_SB(sb)->s_es;
264 [ + - ][ - + ]: 458047 : if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
265 : 0 : ext4_error(sb, "reserved or nonexistent inode %lu", ino);
266 : 0 : goto error_return;
267 : : }
268 : 458047 : block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
269 : 458047 : bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
270 : 458047 : bitmap_bh = ext4_read_inode_bitmap(sb, block_group);
271 : : /* Don't bother if the inode bitmap is corrupt. */
272 : : grp = ext4_get_group_info(sb, block_group);
273 [ + - ][ + - ]: 458047 : if (unlikely(EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) || !bitmap_bh)
274 : : goto error_return;
275 : :
276 : : BUFFER_TRACE(bitmap_bh, "get_write_access");
277 : 458047 : fatal = ext4_journal_get_write_access(handle, bitmap_bh);
278 [ + - ]: 458047 : if (fatal)
279 : : goto error_return;
280 : :
281 : : fatal = -ESRCH;
282 : 458047 : gdp = ext4_get_group_desc(sb, block_group, &bh2);
283 [ + - ]: 458047 : if (gdp) {
284 : : BUFFER_TRACE(bh2, "get_write_access");
285 : 458047 : fatal = ext4_journal_get_write_access(handle, bh2);
286 : : }
287 : : ext4_lock_group(sb, block_group);
288 : 458047 : cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data);
289 [ - + ]: 458047 : if (fatal || !cleared) {
290 : : ext4_unlock_group(sb, block_group);
291 : : goto out;
292 : : }
293 : :
294 : 458047 : count = ext4_free_inodes_count(sb, gdp) + 1;
295 : 458047 : ext4_free_inodes_set(sb, gdp, count);
296 [ + + ]: 458047 : if (is_directory) {
297 : 41644 : count = ext4_used_dirs_count(sb, gdp) - 1;
298 : 41644 : ext4_used_dirs_set(sb, gdp, count);
299 : 41644 : percpu_counter_dec(&sbi->s_dirs_counter);
300 : : }
301 : 458047 : ext4_inode_bitmap_csum_set(sb, block_group, gdp, bitmap_bh,
302 : 458047 : EXT4_INODES_PER_GROUP(sb) / 8);
303 : 458047 : ext4_group_desc_csum_set(sb, block_group, gdp);
304 : : ext4_unlock_group(sb, block_group);
305 : :
306 : 458047 : percpu_counter_inc(&sbi->s_freeinodes_counter);
307 [ + - ]: 458047 : if (sbi->s_log_groups_per_flex) {
308 : : ext4_group_t f = ext4_flex_group(sbi, block_group);
309 : :
310 : 458047 : atomic_inc(&sbi->s_flex_groups[f].free_inodes);
311 [ + + ]: 458047 : if (is_directory)
312 : 41644 : atomic_dec(&sbi->s_flex_groups[f].used_dirs);
313 : : }
314 : : BUFFER_TRACE(bh2, "call ext4_handle_dirty_metadata");
315 : 458047 : fatal = ext4_handle_dirty_metadata(handle, NULL, bh2);
316 : : out:
317 [ + - ]: 458047 : if (cleared) {
318 : : BUFFER_TRACE(bitmap_bh, "call ext4_handle_dirty_metadata");
319 : 458047 : err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
320 [ + - ]: 458047 : if (!fatal)
321 : : fatal = err;
322 : : } else {
323 : 0 : ext4_error(sb, "bit already cleared for inode %lu", ino);
324 : 0 : set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
325 : : }
326 : :
327 : : error_return:
328 : : brelse(bitmap_bh);
329 [ - + ]: 458047 : ext4_std_error(sb, fatal);
330 : : }
331 : :
332 : : struct orlov_stats {
333 : : __u64 free_clusters;
334 : : __u32 free_inodes;
335 : : __u32 used_dirs;
336 : : };
337 : :
338 : : /*
339 : : * Helper function for Orlov's allocator; returns critical information
340 : : * for a particular block group or flex_bg. If flex_size is 1, then g
341 : : * is a block group number; otherwise it is flex_bg number.
342 : : */
343 : 0 : static void get_orlov_stats(struct super_block *sb, ext4_group_t g,
344 : : int flex_size, struct orlov_stats *stats)
345 : : {
346 : : struct ext4_group_desc *desc;
347 : 43052 : struct flex_groups *flex_group = EXT4_SB(sb)->s_flex_groups;
348 : :
349 [ + - ]: 43052 : if (flex_size > 1) {
350 : 43052 : stats->free_inodes = atomic_read(&flex_group[g].free_inodes);
351 : 86104 : stats->free_clusters = atomic64_read(&flex_group[g].free_clusters);
352 : 43052 : stats->used_dirs = atomic_read(&flex_group[g].used_dirs);
353 : 43052 : return;
354 : : }
355 : :
356 : 0 : desc = ext4_get_group_desc(sb, g, NULL);
357 [ # # ]: 43052 : if (desc) {
358 : 0 : stats->free_inodes = ext4_free_inodes_count(sb, desc);
359 : 0 : stats->free_clusters = ext4_free_group_clusters(sb, desc);
360 : 0 : stats->used_dirs = ext4_used_dirs_count(sb, desc);
361 : : } else {
362 : 0 : stats->free_inodes = 0;
363 : 0 : stats->free_clusters = 0;
364 : 0 : stats->used_dirs = 0;
365 : : }
366 : : }
367 : :
368 : : /*
369 : : * Orlov's allocator for directories.
370 : : *
371 : : * We always try to spread first-level directories.
372 : : *
373 : : * If there are blockgroups with both free inodes and free blocks counts
374 : : * not worse than average we return one with smallest directory count.
375 : : * Otherwise we simply return a random group.
376 : : *
377 : : * For the rest rules look so:
378 : : *
379 : : * It's OK to put directory into a group unless
380 : : * it has too many directories already (max_dirs) or
381 : : * it has too few free inodes left (min_inodes) or
382 : : * it has too few free blocks left (min_blocks) or
383 : : * Parent's group is preferred, if it doesn't satisfy these
384 : : * conditions we search cyclically through the rest. If none
385 : : * of the groups look good we just look for a group with more
386 : : * free inodes than average (starting at parent's group).
387 : : */
388 : :
389 : 0 : static int find_group_orlov(struct super_block *sb, struct inode *parent,
390 : : ext4_group_t *group, umode_t mode,
391 : : const struct qstr *qstr)
392 : : {
393 : 41886 : ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
394 : 41886 : struct ext4_sb_info *sbi = EXT4_SB(sb);
395 : : ext4_group_t real_ngroups = ext4_get_groups_count(sb);
396 : 41886 : int inodes_per_group = EXT4_INODES_PER_GROUP(sb);
397 : : unsigned int freei, avefreei, grp_free;
398 : : ext4_fsblk_t freeb, avefreec;
399 : : unsigned int ndirs;
400 : : int max_dirs, min_inodes;
401 : : ext4_grpblk_t min_clusters;
402 : : ext4_group_t i, grp, g, ngroups;
403 : : struct ext4_group_desc *desc;
404 : : struct orlov_stats stats;
405 : : int flex_size = ext4_flex_bg_size(sbi);
406 : : struct dx_hash_info hinfo;
407 : :
408 : : ngroups = real_ngroups;
409 [ + - ]: 41886 : if (flex_size > 1) {
410 : 41886 : ngroups = (real_ngroups + flex_size - 1) >>
411 : : sbi->s_log_groups_per_flex;
412 : 41886 : parent_group >>= sbi->s_log_groups_per_flex;
413 : : }
414 : :
415 : 83772 : freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
416 : 41886 : avefreei = freei / ngroups;
417 : 125658 : freeb = EXT4_C2B(sbi,
418 : : percpu_counter_read_positive(&sbi->s_freeclusters_counter));
419 : : avefreec = freeb;
420 [ - + ][ # # ]: 83772 : do_div(avefreec, ngroups);
[ - + ][ - + ]
[ - + ][ - + ]
[ - + ][ - + ]
[ - - ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
421 : 83771 : ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
422 : :
423 [ + ][ + - ]: 41885 : if (S_ISDIR(mode) &&
424 [ - + ]: 41886 : ((parent == sb->s_root->d_inode) ||
425 : : (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) {
426 : : int best_ndir = inodes_per_group;
427 : : int ret = -1;
428 : :
429 [ # # ]: 0 : if (qstr) {
430 : 0 : hinfo.hash_version = DX_HASH_HALF_MD4;
431 : 0 : hinfo.seed = sbi->s_hash_seed;
432 : 0 : ext4fs_dirhash(qstr->name, qstr->len, &hinfo);
433 : 0 : grp = hinfo.hash;
434 : : } else
435 : 0 : grp = prandom_u32();
436 : 0 : parent_group = (unsigned)grp % ngroups;
437 [ # # ]: 0 : for (i = 0; i < ngroups; i++) {
438 : 0 : g = (parent_group + i) % ngroups;
439 : 0 : get_orlov_stats(sb, g, flex_size, &stats);
440 [ # # ]: 0 : if (!stats.free_inodes)
441 : 0 : continue;
442 [ # # ]: 0 : if (stats.used_dirs >= best_ndir)
443 : 0 : continue;
444 [ # # ]: 0 : if (stats.free_inodes < avefreei)
445 : 0 : continue;
446 [ # # ]: 0 : if (stats.free_clusters < avefreec)
447 : 0 : continue;
448 : : grp = g;
449 : : ret = 0;
450 : 0 : best_ndir = stats.used_dirs;
451 : : }
452 [ # # ]: 0 : if (ret)
453 : : goto fallback;
454 : : found_flex_bg:
455 [ - + ]: 41886 : if (flex_size == 1) {
456 : 0 : *group = grp;
457 : 0 : return 0;
458 : : }
459 : :
460 : : /*
461 : : * We pack inodes at the beginning of the flexgroup's
462 : : * inode tables. Block allocation decisions will do
463 : : * something similar, although regular files will
464 : : * start at 2nd block group of the flexgroup. See
465 : : * ext4_ext_find_goal() and ext4_find_near().
466 : : */
467 : 41886 : grp *= flex_size;
468 [ + - ]: 52687 : for (i = 0; i < flex_size; i++) {
469 [ + - ]: 52687 : if (grp+i >= real_ngroups)
470 : : break;
471 : 52687 : desc = ext4_get_group_desc(sb, grp+i, NULL);
472 [ + - ][ + + ]: 52687 : if (desc && ext4_free_inodes_count(sb, desc)) {
473 : 41886 : *group = grp+i;
474 : 41886 : return 0;
475 : : }
476 : : }
477 : : goto fallback;
478 : : }
479 : :
480 : 41885 : max_dirs = ndirs / ngroups + inodes_per_group / 16;
481 : 41885 : min_inodes = avefreei - inodes_per_group*flex_size / 4;
482 [ - + ]: 41885 : if (min_inodes < 1)
483 : : min_inodes = 1;
484 : 83770 : min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4;
485 : :
486 : : /*
487 : : * Start looking in the flex group where we last allocated an
488 : : * inode for this parent directory
489 : : */
490 [ + + ]: 41885 : if (EXT4_I(parent)->i_last_alloc_group != ~0) {
491 : : parent_group = EXT4_I(parent)->i_last_alloc_group;
492 [ + - ]: 40624 : if (flex_size > 1)
493 : 40624 : parent_group >>= sbi->s_log_groups_per_flex;
494 : : }
495 : :
496 [ + - ]: 43051 : for (i = 0; i < ngroups; i++) {
497 : 43051 : grp = (parent_group + i) % ngroups;
498 : 43051 : get_orlov_stats(sb, grp, flex_size, &stats);
499 [ + + ]: 43052 : if (stats.used_dirs >= max_dirs)
500 : 1087 : continue;
501 [ + + ]: 41965 : if (stats.free_inodes < min_inodes)
502 : 79 : continue;
503 [ + - ]: 41886 : if (stats.free_clusters < min_clusters)
504 : 0 : continue;
505 : : goto found_flex_bg;
506 : : }
507 : :
508 : : fallback:
509 : : ngroups = real_ngroups;
510 : 0 : avefreei = freei / ngroups;
511 : : fallback_retry:
512 : 0 : parent_group = EXT4_I(parent)->i_block_group;
513 [ # # ]: 0 : for (i = 0; i < ngroups; i++) {
514 : 0 : grp = (parent_group + i) % ngroups;
515 : 0 : desc = ext4_get_group_desc(sb, grp, NULL);
516 [ # # ]: 0 : if (desc) {
517 : 0 : grp_free = ext4_free_inodes_count(sb, desc);
518 [ # # ]: 0 : if (grp_free && grp_free >= avefreei) {
519 : 0 : *group = grp;
520 : 0 : return 0;
521 : : }
522 : : }
523 : : }
524 : :
525 [ # # ]: 0 : if (avefreei) {
526 : : /*
527 : : * The free-inodes counter is approximate, and for really small
528 : : * filesystems the above test can fail to find any blockgroups
529 : : */
530 : : avefreei = 0;
531 : : goto fallback_retry;
532 : : }
533 : :
534 : : return -1;
535 : : }
536 : :
537 : 0 : static int find_group_other(struct super_block *sb, struct inode *parent,
538 : : ext4_group_t *group, umode_t mode)
539 : : {
540 : 423531 : ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
541 : : ext4_group_t i, last, ngroups = ext4_get_groups_count(sb);
542 : : struct ext4_group_desc *desc;
543 : 423530 : int flex_size = ext4_flex_bg_size(EXT4_SB(sb));
544 : :
545 : : /*
546 : : * Try to place the inode is the same flex group as its
547 : : * parent. If we can't find space, use the Orlov algorithm to
548 : : * find another flex group, and store that information in the
549 : : * parent directory's inode information so that use that flex
550 : : * group for future allocations.
551 : : */
552 [ + - ]: 847061 : if (flex_size > 1) {
553 : : int retry = 0;
554 : :
555 : : try_again:
556 : 423530 : parent_group &= ~(flex_size-1);
557 : 423530 : last = parent_group + flex_size;
558 [ - + ]: 423530 : if (last > ngroups)
559 : : last = ngroups;
560 [ + - ]: 502041 : for (i = parent_group; i < last; i++) {
561 : 502041 : desc = ext4_get_group_desc(sb, i, NULL);
562 [ + ][ + + ]: 502041 : if (desc && ext4_free_inodes_count(sb, desc)) {
563 : 423530 : *group = i;
564 : 423530 : return 0;
565 : : }
566 : : }
567 [ # # ][ # # ]: 0 : if (!retry && EXT4_I(parent)->i_last_alloc_group != ~0) {
568 : : retry = 1;
569 : : parent_group = EXT4_I(parent)->i_last_alloc_group;
570 : : goto try_again;
571 : : }
572 : : /*
573 : : * If this didn't work, use the Orlov search algorithm
574 : : * to find a new flex group; we pass in the mode to
575 : : * avoid the topdir algorithms.
576 : : */
577 : 0 : *group = parent_group + flex_size;
578 [ # # ]: 0 : if (*group > ngroups)
579 : 0 : *group = 0;
580 : 0 : return find_group_orlov(sb, parent, group, mode, NULL);
581 : : }
582 : :
583 : : /*
584 : : * Try to place the inode in its parent directory
585 : : */
586 : 0 : *group = parent_group;
587 : 0 : desc = ext4_get_group_desc(sb, *group, NULL);
588 [ # # ]: 0 : if (desc && ext4_free_inodes_count(sb, desc) &&
[ # # # # ]
589 : 0 : ext4_free_group_clusters(sb, desc))
590 : : return 0;
591 : :
592 : : /*
593 : : * We're going to place this inode in a different blockgroup from its
594 : : * parent. We want to cause files in a common directory to all land in
595 : : * the same blockgroup. But we want files which are in a different
596 : : * directory which shares a blockgroup with our parent to land in a
597 : : * different blockgroup.
598 : : *
599 : : * So add our directory's i_ino into the starting point for the hash.
600 : : */
601 : 0 : *group = (*group + parent->i_ino) % ngroups;
602 : :
603 : : /*
604 : : * Use a quadratic hash to find a group with a free inode and some free
605 : : * blocks.
606 : : */
607 [ # # ]: 0 : for (i = 1; i < ngroups; i <<= 1) {
608 : 0 : *group += i;
609 [ # # ]: 0 : if (*group >= ngroups)
610 : 0 : *group -= ngroups;
611 : 0 : desc = ext4_get_group_desc(sb, *group, NULL);
612 [ # # ]: 0 : if (desc && ext4_free_inodes_count(sb, desc) &&
[ # # # # ]
613 : 0 : ext4_free_group_clusters(sb, desc))
614 : : return 0;
615 : : }
616 : :
617 : : /*
618 : : * That failed: try linear search for a free inode, even if that group
619 : : * has no free blocks.
620 : : */
621 : 0 : *group = parent_group;
622 [ # # ]: 0 : for (i = 0; i < ngroups; i++) {
623 [ # # ]: 0 : if (++*group >= ngroups)
624 : 0 : *group = 0;
625 : 0 : desc = ext4_get_group_desc(sb, *group, NULL);
626 [ # # ][ # # ]: 0 : if (desc && ext4_free_inodes_count(sb, desc))
627 : : return 0;
628 : : }
629 : :
630 : : return -1;
631 : : }
632 : :
633 : : /*
634 : : * In no journal mode, if an inode has recently been deleted, we want
635 : : * to avoid reusing it until we're reasonably sure the inode table
636 : : * block has been written back to disk. (Yes, these values are
637 : : * somewhat arbitrary...)
638 : : */
639 : : #define RECENTCY_MIN 5
640 : : #define RECENTCY_DIRTY 30
641 : :
642 : 0 : static int recently_deleted(struct super_block *sb, ext4_group_t group, int ino)
643 : : {
644 : : struct ext4_group_desc *gdp;
645 : : struct ext4_inode *raw_inode;
646 : : struct buffer_head *bh;
647 : : unsigned long dtime, now;
648 : 0 : int inodes_per_block = EXT4_SB(sb)->s_inodes_per_block;
649 : : int offset, ret = 0, recentcy = RECENTCY_MIN;
650 : :
651 : 0 : gdp = ext4_get_group_desc(sb, group, NULL);
652 [ # # ]: 0 : if (unlikely(!gdp))
653 : : return 0;
654 : :
655 : 0 : bh = sb_getblk(sb, ext4_inode_table(sb, gdp) +
656 : 0 : (ino / inodes_per_block));
657 [ # # ][ # # ]: 0 : if (unlikely(!bh) || !buffer_uptodate(bh))
658 : : /*
659 : : * If the block is not in the buffer cache, then it
660 : : * must have been written out.
661 : : */
662 : : goto out;
663 : :
664 : 0 : offset = (ino % inodes_per_block) * EXT4_INODE_SIZE(sb);
665 : 0 : raw_inode = (struct ext4_inode *) (bh->b_data + offset);
666 : 0 : dtime = le32_to_cpu(raw_inode->i_dtime);
667 : 0 : now = get_seconds();
668 [ # # ]: 0 : if (buffer_dirty(bh))
669 : : recentcy += RECENTCY_DIRTY;
670 : :
671 [ # # ][ # # ]: 0 : if (dtime && (dtime < now) && (now < dtime + recentcy))
672 : : ret = 1;
673 : : out:
674 : : brelse(bh);
675 : 0 : return ret;
676 : : }
677 : :
678 : : /*
679 : : * There are two policies for allocating an inode. If the new inode is
680 : : * a directory, then a forward search is made for a block group with both
681 : : * free space and a low directory-to-inode ratio; if that fails, then of
682 : : * the groups with above-average free space, that group with the fewest
683 : : * directories already is chosen.
684 : : *
685 : : * For other inodes, search forward from the parent directory's block
686 : : * group to find a free inode.
687 : : */
688 : 0 : struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
689 : : umode_t mode, const struct qstr *qstr,
690 : : __u32 goal, uid_t *owner, int handle_type,
691 : : unsigned int line_no, int nblocks)
692 : : {
693 : 4204885 : struct super_block *sb;
694 : : struct buffer_head *inode_bitmap_bh = NULL;
695 : : struct buffer_head *group_desc_bh;
696 : 465416 : ext4_group_t ngroups, group = 0;
697 : : unsigned long ino = 0;
698 : 465417 : struct inode *inode;
699 : : struct ext4_group_desc *gdp = NULL;
700 : : struct ext4_inode_info *ei;
701 : 0 : struct ext4_sb_info *sbi;
702 : : int ret2, err = 0;
703 : : struct inode *ret;
704 : : ext4_group_t i;
705 : : ext4_group_t flex_group;
706 : : struct ext4_group_info *grp;
707 : :
708 : : /* Cannot create files in a deleted directory */
709 [ + - ][ + - ]: 465416 : if (!dir || !dir->i_nlink)
710 : : return ERR_PTR(-EPERM);
711 : :
712 : 465416 : sb = dir->i_sb;
713 : : ngroups = ext4_get_groups_count(sb);
714 : 465416 : trace_ext4_request_inode(dir, mode);
715 : 465416 : inode = new_inode(sb);
716 [ + - ]: 465417 : if (!inode)
717 : : return ERR_PTR(-ENOMEM);
718 : : ei = EXT4_I(inode);
719 : : sbi = EXT4_SB(sb);
720 : :
721 : : /*
722 : : * Initalize owners and quota early so that we don't have to account
723 : : * for quota initialization worst case in standard inode creating
724 : : * transaction
725 : : */
726 [ - + ]: 465417 : if (owner) {
727 : 0 : inode->i_mode = mode;
728 : 0 : i_uid_write(inode, owner[0]);
729 : 0 : i_gid_write(inode, owner[1]);
730 [ - + ]: 465417 : } else if (test_opt(sb, GRPID)) {
731 : 0 : inode->i_mode = mode;
732 : 0 : inode->i_uid = current_fsuid();
733 : 0 : inode->i_gid = dir->i_gid;
734 : : } else
735 : 465417 : inode_init_owner(inode, dir, mode);
736 : 465417 : dquot_initialize(inode);
737 : :
738 [ + - ]: 465417 : if (!goal)
739 : 465417 : goal = sbi->s_inode_goal;
740 : :
741 [ - + ][ # # ]: 465417 : if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) {
742 : 0 : group = (goal - 1) / EXT4_INODES_PER_GROUP(sb);
743 : 0 : ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb);
744 : : ret2 = 0;
745 : 0 : goto got_group;
746 : : }
747 : :
748 [ + + ]: 465417 : if (S_ISDIR(mode))
749 : 41886 : ret2 = find_group_orlov(sb, dir, &group, mode, qstr);
750 : : else
751 : 423531 : ret2 = find_group_other(sb, dir, &group, mode);
752 : :
753 : : got_group:
754 : 465417 : EXT4_I(dir)->i_last_alloc_group = group;
755 : : err = -ENOSPC;
756 [ + - ]: 465417 : if (ret2 == -1)
757 : : goto out;
758 : :
759 : : /*
760 : : * Normally we will only go through one pass of this loop,
761 : : * unless we get unlucky and it turns out the group we selected
762 : : * had its last inode grabbed by someone else.
763 : : */
764 [ + - ]: 465417 : for (i = 0; i < ngroups; i++, ino = 0) {
765 : : err = -EIO;
766 : :
767 : 465417 : gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
768 [ + - ]: 465414 : if (!gdp)
769 : : goto out;
770 : :
771 : : /*
772 : : * Check free inodes count before loading bitmap.
773 : : */
774 [ - + ]: 465414 : if (ext4_free_inodes_count(sb, gdp) == 0) {
775 [ # # ]: 0 : if (++group == ngroups)
776 : 0 : group = 0;
777 : 0 : continue;
778 : : }
779 : :
780 : 465416 : grp = ext4_get_group_info(sb, group);
781 : : /* Skip groups with already-known suspicious inode tables */
782 [ - + ]: 465416 : if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
783 [ # # ]: 0 : if (++group == ngroups)
784 : 0 : group = 0;
785 : 0 : continue;
786 : : }
787 : :
788 : : brelse(inode_bitmap_bh);
789 : 465416 : inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
790 : : /* Skip groups with suspicious inode tables */
791 [ + - ][ - + ]: 465417 : if (EXT4_MB_GRP_IBITMAP_CORRUPT(grp) || !inode_bitmap_bh) {
792 [ # # ]: 0 : if (++group == ngroups)
793 : 0 : group = 0;
794 : 465417 : continue;
795 : : }
796 : :
797 : : repeat_in_this_group:
798 : 465477 : ino = ext4_find_next_zero_bit((unsigned long *)
799 : 465477 : inode_bitmap_bh->b_data,
800 : : EXT4_INODES_PER_GROUP(sb), ino);
801 [ + ]: 465476 : if (ino >= EXT4_INODES_PER_GROUP(sb))
802 : : goto next_group;
803 [ + + ][ - + ]: 465477 : if (group == 0 && (ino+1) < EXT4_FIRST_INO(sb)) {
804 : 0 : ext4_error(sb, "reserved inode found cleared - "
805 : : "inode=%lu", ino + 1);
806 : 0 : continue;
807 : : }
808 [ - + # # ]: 465477 : if ((EXT4_SB(sb)->s_journal == NULL) &&
809 : 0 : recently_deleted(sb, group, ino)) {
810 : 0 : ino++;
811 : 0 : goto next_inode;
812 : : }
813 [ + + ]: 465477 : if (!handle) {
814 [ - + ]: 465417 : BUG_ON(nblocks <= 0);
815 : 465417 : handle = __ext4_journal_start_sb(dir->i_sb, line_no,
816 : : handle_type, nblocks,
817 : : 0);
818 [ - + ]: 465416 : if (IS_ERR(handle)) {
819 : : err = PTR_ERR(handle);
820 [ # # ]: 0 : ext4_std_error(sb, err);
821 : : goto out;
822 : : }
823 : : }
824 : : BUFFER_TRACE(inode_bitmap_bh, "get_write_access");
825 : 465476 : err = ext4_journal_get_write_access(handle, inode_bitmap_bh);
826 [ - + ]: 465477 : if (err) {
827 [ # # ]: 0 : ext4_std_error(sb, err);
828 : : goto out;
829 : : }
830 : 465477 : ext4_lock_group(sb, group);
831 : 465477 : ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data);
832 : 465477 : ext4_unlock_group(sb, group);
833 : 465477 : ino++; /* the inode bitmap is zero-based */
834 [ + + ]: 465477 : if (!ret2)
835 : : goto got; /* we grabbed the inode! */
836 : : next_inode:
837 [ + + ]: 61 : if (ino < EXT4_INODES_PER_GROUP(sb))
838 : : goto repeat_in_this_group;
839 : : next_group:
840 [ # # ]: 0 : if (++group == ngroups)
841 : 0 : group = 0;
842 : : }
843 : : err = -ENOSPC;
844 : : goto out;
845 : :
846 : : got:
847 : : BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata");
848 : 465416 : err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh);
849 [ - + ]: 465415 : if (err) {
850 [ # # ]: 0 : ext4_std_error(sb, err);
851 : : goto out;
852 : : }
853 : :
854 : : /* We may have to initialize the block bitmap if it isn't already */
855 [ + ][ - + ]: 465415 : if (ext4_has_group_desc_csum(sb) &&
856 : 465416 : gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
857 : : struct buffer_head *block_bitmap_bh;
858 : :
859 : 0 : block_bitmap_bh = ext4_read_block_bitmap(sb, group);
860 : : BUFFER_TRACE(block_bitmap_bh, "get block bitmap access");
861 : 0 : err = ext4_journal_get_write_access(handle, block_bitmap_bh);
862 [ # # ]: 0 : if (err) {
863 : : brelse(block_bitmap_bh);
864 [ # # ]: 0 : ext4_std_error(sb, err);
865 : : goto out;
866 : : }
867 : :
868 : : BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap");
869 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh);
870 : :
871 : : /* recheck and clear flag under lock if we still need to */
872 : 0 : ext4_lock_group(sb, group);
873 [ # # ]: 0 : if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
874 : 0 : gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
875 : 0 : ext4_free_group_clusters_set(sb, gdp,
876 : : ext4_free_clusters_after_init(sb, group, gdp));
877 : 0 : ext4_block_bitmap_csum_set(sb, group, gdp,
878 : : block_bitmap_bh);
879 : 0 : ext4_group_desc_csum_set(sb, group, gdp);
880 : : }
881 : 0 : ext4_unlock_group(sb, group);
882 : : brelse(block_bitmap_bh);
883 : :
884 [ # # ]: 0 : if (err) {
885 [ # # ]: 0 : ext4_std_error(sb, err);
886 : : goto out;
887 : : }
888 : : }
889 : :
890 : : BUFFER_TRACE(group_desc_bh, "get_write_access");
891 : 465415 : err = ext4_journal_get_write_access(handle, group_desc_bh);
892 [ - + ]: 465417 : if (err) {
893 [ # # ]: 0 : ext4_std_error(sb, err);
894 : : goto out;
895 : : }
896 : :
897 : : /* Update the relevant bg descriptor fields */
898 [ + - ]: 465417 : if (ext4_has_group_desc_csum(sb)) {
899 : : int free;
900 : 465417 : struct ext4_group_info *grp = ext4_get_group_info(sb, group);
901 : :
902 : 465417 : down_read(&grp->alloc_sem); /* protect vs itable lazyinit */
903 : 465415 : ext4_lock_group(sb, group); /* while we modify the bg desc */
904 : 930834 : free = EXT4_INODES_PER_GROUP(sb) -
905 : 465417 : ext4_itable_unused_count(sb, gdp);
906 [ + + ]: 465417 : if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
907 : 4 : gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);
908 : : free = 0;
909 : : }
910 : : /*
911 : : * Check the relative inode number against the last used
912 : : * relative inode number in this group. if it is greater
913 : : * we need to update the bg_itable_unused count
914 : : */
915 [ + + ]: 465417 : if (ino > free)
916 : 15952 : ext4_itable_unused_set(sb, gdp,
917 : 15952 : (EXT4_INODES_PER_GROUP(sb) - ino));
918 : 465417 : up_read(&grp->alloc_sem);
919 : : } else {
920 : 0 : ext4_lock_group(sb, group);
921 : : }
922 : :
923 : 465417 : ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1);
924 [ + + ]: 465416 : if (S_ISDIR(mode)) {
925 : 41886 : ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1);
926 [ + - ]: 41886 : if (sbi->s_log_groups_per_flex) {
927 : 41886 : ext4_group_t f = ext4_flex_group(sbi, group);
928 : :
929 : 41886 : atomic_inc(&sbi->s_flex_groups[f].used_dirs);
930 : : }
931 : : }
932 [ + - ]: 465416 : if (ext4_has_group_desc_csum(sb)) {
933 : 465416 : ext4_inode_bitmap_csum_set(sb, group, gdp, inode_bitmap_bh,
934 : 465416 : EXT4_INODES_PER_GROUP(sb) / 8);
935 : 465417 : ext4_group_desc_csum_set(sb, group, gdp);
936 : : }
937 : 465414 : ext4_unlock_group(sb, group);
938 : :
939 : : BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata");
940 : 465414 : err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh);
941 [ - + ]: 465417 : if (err) {
942 [ # # ]: 0 : ext4_std_error(sb, err);
943 : : goto out;
944 : : }
945 : :
946 : 465417 : percpu_counter_dec(&sbi->s_freeinodes_counter);
947 [ + + ]: 465417 : if (S_ISDIR(mode))
948 : 41886 : percpu_counter_inc(&sbi->s_dirs_counter);
949 : :
950 [ + - ]: 465417 : if (sbi->s_log_groups_per_flex) {
951 : 465417 : flex_group = ext4_flex_group(sbi, group);
952 : 465417 : atomic_dec(&sbi->s_flex_groups[flex_group].free_inodes);
953 : : }
954 : :
955 : 465417 : inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb);
956 : : /* This is the optimal IO size (for stat), not the fs block size */
957 : 465417 : inode->i_blocks = 0;
958 : 465417 : inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime =
959 : : ext4_current_time(inode);
960 : :
961 : 465417 : memset(ei->i_data, 0, sizeof(ei->i_data));
962 : 465415 : ei->i_dir_start_lookup = 0;
963 : 465415 : ei->i_disksize = 0;
964 : :
965 : : /* Don't inherit extent flag from directory, amongst others. */
966 : 465415 : ei->i_flags =
967 : 465415 : ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED);
968 : 465415 : ei->i_file_acl = 0;
969 : 465415 : ei->i_dtime = 0;
970 : 465415 : ei->i_block_group = group;
971 : 465415 : ei->i_last_alloc_group = ~0;
972 : :
973 : 465415 : ext4_set_inode_flags(inode);
974 [ + + ][ + ]: 465417 : if (IS_DIRSYNC(inode))
975 : : ext4_handle_sync(handle);
976 [ - + ]: 465417 : if (insert_inode_locked(inode) < 0) {
977 : : /*
978 : : * Likely a bitmap corruption causing inode to be allocated
979 : : * twice.
980 : : */
981 : : err = -EIO;
982 : 0 : ext4_error(sb, "failed to insert inode %lu: doubly allocated?",
983 : : inode->i_ino);
984 : 0 : goto out;
985 : : }
986 : : spin_lock(&sbi->s_next_gen_lock);
987 : 465417 : inode->i_generation = sbi->s_next_generation++;
988 : : spin_unlock(&sbi->s_next_gen_lock);
989 : :
990 : : /* Precompute checksum seed for inode metadata */
991 [ - + ]: 465417 : if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
992 : : EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
993 : : __u32 csum;
994 : 0 : __le32 inum = cpu_to_le32(inode->i_ino);
995 : 0 : __le32 gen = cpu_to_le32(inode->i_generation);
996 : 0 : csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum,
997 : : sizeof(inum));
998 : 0 : ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen,
999 : : sizeof(gen));
1000 : : }
1001 : :
1002 : : ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */
1003 : : ext4_set_inode_state(inode, EXT4_STATE_NEW);
1004 : :
1005 : 465417 : ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize;
1006 : :
1007 : 465417 : ei->i_inline_off = 0;
1008 [ - + ]: 465417 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_INLINE_DATA))
1009 : : ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1010 : :
1011 : : ret = inode;
1012 : 465417 : err = dquot_alloc_inode(inode);
1013 [ + - ]: 465417 : if (err)
1014 : : goto fail_drop;
1015 : :
1016 : : err = ext4_init_acl(handle, inode, dir);
1017 : : if (err)
1018 : : goto fail_free_drop;
1019 : :
1020 : : err = ext4_init_security(handle, inode, dir, qstr);
1021 : : if (err)
1022 : : goto fail_free_drop;
1023 : :
1024 [ + - ]: 465417 : if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1025 : : /* set extent flag only for directory, file and normal symlink*/
1026 [ + + ][ + + ]: 465417 : if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) {
1027 : : ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
1028 : 379995 : ext4_ext_tree_init(handle, inode);
1029 : : }
1030 : : }
1031 : :
1032 [ + - ]: 465417 : if (ext4_handle_valid(handle)) {
1033 : 465417 : ei->i_sync_tid = handle->h_transaction->t_tid;
1034 : 465417 : ei->i_datasync_tid = handle->h_transaction->t_tid;
1035 : : }
1036 : :
1037 : 465417 : err = ext4_mark_inode_dirty(handle, inode);
1038 [ - + ]: 465417 : if (err) {
1039 [ # # ]: 0 : ext4_std_error(sb, err);
1040 : : goto fail_free_drop;
1041 : : }
1042 : :
1043 : : ext4_debug("allocating inode %lu\n", inode->i_ino);
1044 : : trace_ext4_allocate_inode(inode, dir, mode);
1045 : : brelse(inode_bitmap_bh);
1046 : 465417 : return ret;
1047 : :
1048 : : fail_free_drop:
1049 : 0 : dquot_free_inode(inode);
1050 : : fail_drop:
1051 : 0 : clear_nlink(inode);
1052 : 0 : unlock_new_inode(inode);
1053 : : out:
1054 : 0 : dquot_drop(inode);
1055 : 0 : inode->i_flags |= S_NOQUOTA;
1056 : 0 : iput(inode);
1057 : : brelse(inode_bitmap_bh);
1058 : 0 : return ERR_PTR(err);
1059 : : }
1060 : :
1061 : : /* Verify that we are loading a valid orphan from disk */
1062 : 0 : struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
1063 : : {
1064 : 0 : unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
1065 : : ext4_group_t block_group;
1066 : : int bit;
1067 : : struct buffer_head *bitmap_bh;
1068 : : struct inode *inode = NULL;
1069 : : long err = -EIO;
1070 : :
1071 : : /* Error cases - e2fsck has already cleaned up for us */
1072 [ # # ]: 0 : if (ino > max_ino) {
1073 : 0 : ext4_warning(sb, "bad orphan ino %lu! e2fsck was run?", ino);
1074 : 0 : goto error;
1075 : : }
1076 : :
1077 : 0 : block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
1078 : 0 : bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb);
1079 : 0 : bitmap_bh = ext4_read_inode_bitmap(sb, block_group);
1080 [ # # ]: 0 : if (!bitmap_bh) {
1081 : 0 : ext4_warning(sb, "inode bitmap error for orphan %lu", ino);
1082 : 0 : goto error;
1083 : : }
1084 : :
1085 : : /* Having the inode bit set should be a 100% indicator that this
1086 : : * is a valid orphan (no e2fsck run on fs). Orphans also include
1087 : : * inodes that were being truncated, so we can't check i_nlink==0.
1088 : : */
1089 [ # # ]: 0 : if (!ext4_test_bit(bit, bitmap_bh->b_data))
1090 : : goto bad_orphan;
1091 : :
1092 : 0 : inode = ext4_iget(sb, ino);
1093 [ # # ]: 0 : if (IS_ERR(inode))
1094 : : goto iget_failed;
1095 : :
1096 : : /*
1097 : : * If the orphans has i_nlinks > 0 then it should be able to be
1098 : : * truncated, otherwise it won't be removed from the orphan list
1099 : : * during processing and an infinite loop will result.
1100 : : */
1101 [ # # ][ # # ]: 0 : if (inode->i_nlink && !ext4_can_truncate(inode))
1102 : : goto bad_orphan;
1103 : :
1104 [ # # ]: 0 : if (NEXT_ORPHAN(inode) > max_ino)
1105 : : goto bad_orphan;
1106 : : brelse(bitmap_bh);
1107 : 0 : return inode;
1108 : :
1109 : : iget_failed:
1110 : : err = PTR_ERR(inode);
1111 : : inode = NULL;
1112 : : bad_orphan:
1113 : 0 : ext4_warning(sb, "bad orphan inode %lu! e2fsck was run?", ino);
1114 : 0 : printk(KERN_WARNING "ext4_test_bit(bit=%d, block=%llu) = %d\n",
1115 : : bit, (unsigned long long)bitmap_bh->b_blocknr,
1116 : 0 : ext4_test_bit(bit, bitmap_bh->b_data));
1117 : 0 : printk(KERN_WARNING "inode=%p\n", inode);
1118 [ # # ]: 0 : if (inode) {
1119 : 0 : printk(KERN_WARNING "is_bad_inode(inode)=%d\n",
1120 : : is_bad_inode(inode));
1121 : 0 : printk(KERN_WARNING "NEXT_ORPHAN(inode)=%u\n",
1122 : : NEXT_ORPHAN(inode));
1123 : 0 : printk(KERN_WARNING "max_ino=%lu\n", max_ino);
1124 : 0 : printk(KERN_WARNING "i_nlink=%u\n", inode->i_nlink);
1125 : : /* Avoid freeing blocks if we got a bad deleted inode */
1126 [ # # ]: 0 : if (inode->i_nlink == 0)
1127 : 0 : inode->i_blocks = 0;
1128 : 0 : iput(inode);
1129 : : }
1130 : : brelse(bitmap_bh);
1131 : : error:
1132 : 0 : return ERR_PTR(err);
1133 : : }
1134 : :
1135 : 0 : unsigned long ext4_count_free_inodes(struct super_block *sb)
1136 : : {
1137 : : unsigned long desc_count;
1138 : : struct ext4_group_desc *gdp;
1139 : : ext4_group_t i, ngroups = ext4_get_groups_count(sb);
1140 : : #ifdef EXT4FS_DEBUG
1141 : : struct ext4_super_block *es;
1142 : : unsigned long bitmap_count, x;
1143 : : struct buffer_head *bitmap_bh = NULL;
1144 : :
1145 : : es = EXT4_SB(sb)->s_es;
1146 : : desc_count = 0;
1147 : : bitmap_count = 0;
1148 : : gdp = NULL;
1149 : : for (i = 0; i < ngroups; i++) {
1150 : : gdp = ext4_get_group_desc(sb, i, NULL);
1151 : : if (!gdp)
1152 : : continue;
1153 : : desc_count += ext4_free_inodes_count(sb, gdp);
1154 : : brelse(bitmap_bh);
1155 : : bitmap_bh = ext4_read_inode_bitmap(sb, i);
1156 : : if (!bitmap_bh)
1157 : : continue;
1158 : :
1159 : : x = ext4_count_free(bitmap_bh->b_data,
1160 : : EXT4_INODES_PER_GROUP(sb) / 8);
1161 : : printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n",
1162 : : (unsigned long) i, ext4_free_inodes_count(sb, gdp), x);
1163 : : bitmap_count += x;
1164 : : }
1165 : : brelse(bitmap_bh);
1166 : : printk(KERN_DEBUG "ext4_count_free_inodes: "
1167 : : "stored = %u, computed = %lu, %lu\n",
1168 : : le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count);
1169 : : return desc_count;
1170 : : #else
1171 : : desc_count = 0;
1172 [ # # ]: 0 : for (i = 0; i < ngroups; i++) {
1173 : 0 : gdp = ext4_get_group_desc(sb, i, NULL);
1174 [ # # ]: 0 : if (!gdp)
1175 : 0 : continue;
1176 : 0 : desc_count += ext4_free_inodes_count(sb, gdp);
1177 : 0 : cond_resched();
1178 : : }
1179 : 0 : return desc_count;
1180 : : #endif
1181 : : }
1182 : :
1183 : : /* Called at mount-time, super-block is locked */
1184 : 0 : unsigned long ext4_count_dirs(struct super_block * sb)
1185 : : {
1186 : : unsigned long count = 0;
1187 : : ext4_group_t i, ngroups = ext4_get_groups_count(sb);
1188 : :
1189 [ # # ]: 0 : for (i = 0; i < ngroups; i++) {
1190 : 0 : struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1191 [ # # ]: 0 : if (!gdp)
1192 : 0 : continue;
1193 : 0 : count += ext4_used_dirs_count(sb, gdp);
1194 : : }
1195 : 0 : return count;
1196 : : }
1197 : :
1198 : : /*
1199 : : * Zeroes not yet zeroed inode table - just write zeroes through the whole
1200 : : * inode table. Must be called without any spinlock held. The only place
1201 : : * where it is called from on active part of filesystem is ext4lazyinit
1202 : : * thread, so we do not need any special locks, however we have to prevent
1203 : : * inode allocation from the current group, so we take alloc_sem lock, to
1204 : : * block ext4_new_inode() until we are finished.
1205 : : */
1206 : 0 : int ext4_init_inode_table(struct super_block *sb, ext4_group_t group,
1207 : : int barrier)
1208 : : {
1209 : : struct ext4_group_info *grp = ext4_get_group_info(sb, group);
1210 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1211 : : struct ext4_group_desc *gdp = NULL;
1212 : : struct buffer_head *group_desc_bh;
1213 : : handle_t *handle;
1214 : : ext4_fsblk_t blk;
1215 : : int num, ret = 0, used_blks = 0;
1216 : :
1217 : : /* This should not happen, but just to be sure check this */
1218 [ # # ]: 0 : if (sb->s_flags & MS_RDONLY) {
1219 : : ret = 1;
1220 : : goto out;
1221 : : }
1222 : :
1223 : 0 : gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
1224 [ # # ]: 0 : if (!gdp)
1225 : : goto out;
1226 : :
1227 : : /*
1228 : : * We do not need to lock this, because we are the only one
1229 : : * handling this flag.
1230 : : */
1231 [ # # ]: 0 : if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))
1232 : : goto out;
1233 : :
1234 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1235 [ # # ]: 0 : if (IS_ERR(handle)) {
1236 : : ret = PTR_ERR(handle);
1237 : 0 : goto out;
1238 : : }
1239 : :
1240 : 0 : down_write(&grp->alloc_sem);
1241 : : /*
1242 : : * If inode bitmap was already initialized there may be some
1243 : : * used inodes so we need to skip blocks with used inodes in
1244 : : * inode table.
1245 : : */
1246 [ # # ]: 0 : if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)))
1247 : 0 : used_blks = DIV_ROUND_UP((EXT4_INODES_PER_GROUP(sb) -
1248 : : ext4_itable_unused_count(sb, gdp)),
1249 : : sbi->s_inodes_per_block);
1250 : :
1251 [ # # ][ # # ]: 0 : if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) {
1252 : 0 : ext4_error(sb, "Something is wrong with group %u: "
1253 : : "used itable blocks: %d; "
1254 : : "itable unused count: %u",
1255 : : group, used_blks,
1256 : : ext4_itable_unused_count(sb, gdp));
1257 : : ret = 1;
1258 : 0 : goto err_out;
1259 : : }
1260 : :
1261 : 0 : blk = ext4_inode_table(sb, gdp) + used_blks;
1262 : 0 : num = sbi->s_itb_per_group - used_blks;
1263 : :
1264 : : BUFFER_TRACE(group_desc_bh, "get_write_access");
1265 : 0 : ret = ext4_journal_get_write_access(handle,
1266 : : group_desc_bh);
1267 [ # # ]: 0 : if (ret)
1268 : : goto err_out;
1269 : :
1270 : : /*
1271 : : * Skip zeroout if the inode table is full. But we set the ZEROED
1272 : : * flag anyway, because obviously, when it is full it does not need
1273 : : * further zeroing.
1274 : : */
1275 [ # # ]: 0 : if (unlikely(num == 0))
1276 : : goto skip_zeroout;
1277 : :
1278 : : ext4_debug("going to zero out inode table in group %d\n",
1279 : : group);
1280 : 0 : ret = sb_issue_zeroout(sb, blk, num, GFP_NOFS);
1281 [ # # ]: 0 : if (ret < 0)
1282 : : goto err_out;
1283 [ # # ]: 0 : if (barrier)
1284 : 0 : blkdev_issue_flush(sb->s_bdev, GFP_NOFS, NULL);
1285 : :
1286 : : skip_zeroout:
1287 : : ext4_lock_group(sb, group);
1288 : 0 : gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED);
1289 : 0 : ext4_group_desc_csum_set(sb, group, gdp);
1290 : : ext4_unlock_group(sb, group);
1291 : :
1292 : : BUFFER_TRACE(group_desc_bh,
1293 : : "call ext4_handle_dirty_metadata");
1294 : 0 : ret = ext4_handle_dirty_metadata(handle, NULL,
1295 : : group_desc_bh);
1296 : :
1297 : : err_out:
1298 : 0 : up_write(&grp->alloc_sem);
1299 : 0 : ext4_journal_stop(handle);
1300 : : out:
1301 : 0 : return ret;
1302 : : }
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