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1 : : /*
2 : : * Written by Stephen C. Tweedie <sct@redhat.com>, 1999
3 : : *
4 : : * Copyright 1998--1999 Red Hat corp --- All Rights Reserved
5 : : *
6 : : * This file is part of the Linux kernel and is made available under
7 : : * the terms of the GNU General Public License, version 2, or at your
8 : : * option, any later version, incorporated herein by reference.
9 : : *
10 : : * Copyright (C) 1992, 1993, 1994, 1995
11 : : * Remy Card (card@masi.ibp.fr)
12 : : * Laboratoire MASI - Institut Blaise Pascal
13 : : * Universite Pierre et Marie Curie (Paris VI)
14 : : *
15 : : * from
16 : : *
17 : : * linux/include/linux/minix_fs.h
18 : : *
19 : : * Copyright (C) 1991, 1992 Linus Torvalds
20 : : */
21 : :
22 : : #include <linux/fs.h>
23 : : #include <linux/jbd.h>
24 : : #include <linux/magic.h>
25 : : #include <linux/bug.h>
26 : : #include <linux/blockgroup_lock.h>
27 : :
28 : : /*
29 : : * The second extended filesystem constants/structures
30 : : */
31 : :
32 : : /*
33 : : * Define EXT3FS_DEBUG to produce debug messages
34 : : */
35 : : #undef EXT3FS_DEBUG
36 : :
37 : : /*
38 : : * Define EXT3_RESERVATION to reserve data blocks for expanding files
39 : : */
40 : : #define EXT3_DEFAULT_RESERVE_BLOCKS 8
41 : : /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
42 : : #define EXT3_MAX_RESERVE_BLOCKS 1027
43 : : #define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
44 : :
45 : : /*
46 : : * Debug code
47 : : */
48 : : #ifdef EXT3FS_DEBUG
49 : : #define ext3_debug(f, a...) \
50 : : do { \
51 : : printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \
52 : : __FILE__, __LINE__, __func__); \
53 : : printk (KERN_DEBUG f, ## a); \
54 : : } while (0)
55 : : #else
56 : : #define ext3_debug(f, a...) do {} while (0)
57 : : #endif
58 : :
59 : : /*
60 : : * Special inodes numbers
61 : : */
62 : : #define EXT3_BAD_INO 1 /* Bad blocks inode */
63 : : #define EXT3_ROOT_INO 2 /* Root inode */
64 : : #define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */
65 : : #define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */
66 : : #define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */
67 : : #define EXT3_JOURNAL_INO 8 /* Journal inode */
68 : :
69 : : /* First non-reserved inode for old ext3 filesystems */
70 : : #define EXT3_GOOD_OLD_FIRST_INO 11
71 : :
72 : : /*
73 : : * Maximal count of links to a file
74 : : */
75 : : #define EXT3_LINK_MAX 32000
76 : :
77 : : /*
78 : : * Macro-instructions used to manage several block sizes
79 : : */
80 : : #define EXT3_MIN_BLOCK_SIZE 1024
81 : : #define EXT3_MAX_BLOCK_SIZE 65536
82 : : #define EXT3_MIN_BLOCK_LOG_SIZE 10
83 : : #define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize)
84 : : #define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
85 : : #define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
86 : : #define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits)
87 : : #define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size)
88 : : #define EXT3_FIRST_INO(s) (EXT3_SB(s)->s_first_ino)
89 : :
90 : : /*
91 : : * Macro-instructions used to manage fragments
92 : : */
93 : : #define EXT3_MIN_FRAG_SIZE 1024
94 : : #define EXT3_MAX_FRAG_SIZE 4096
95 : : #define EXT3_MIN_FRAG_LOG_SIZE 10
96 : : #define EXT3_FRAG_SIZE(s) (EXT3_SB(s)->s_frag_size)
97 : : #define EXT3_FRAGS_PER_BLOCK(s) (EXT3_SB(s)->s_frags_per_block)
98 : :
99 : : /*
100 : : * Structure of a blocks group descriptor
101 : : */
102 : : struct ext3_group_desc
103 : : {
104 : : __le32 bg_block_bitmap; /* Blocks bitmap block */
105 : : __le32 bg_inode_bitmap; /* Inodes bitmap block */
106 : : __le32 bg_inode_table; /* Inodes table block */
107 : : __le16 bg_free_blocks_count; /* Free blocks count */
108 : : __le16 bg_free_inodes_count; /* Free inodes count */
109 : : __le16 bg_used_dirs_count; /* Directories count */
110 : : __u16 bg_pad;
111 : : __le32 bg_reserved[3];
112 : : };
113 : :
114 : : /*
115 : : * Macro-instructions used to manage group descriptors
116 : : */
117 : : #define EXT3_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group)
118 : : #define EXT3_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block)
119 : : #define EXT3_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group)
120 : : #define EXT3_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits)
121 : :
122 : : /*
123 : : * Constants relative to the data blocks
124 : : */
125 : : #define EXT3_NDIR_BLOCKS 12
126 : : #define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS
127 : : #define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1)
128 : : #define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1)
129 : : #define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1)
130 : :
131 : : /*
132 : : * Inode flags
133 : : */
134 : : #define EXT3_SECRM_FL 0x00000001 /* Secure deletion */
135 : : #define EXT3_UNRM_FL 0x00000002 /* Undelete */
136 : : #define EXT3_COMPR_FL 0x00000004 /* Compress file */
137 : : #define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */
138 : : #define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */
139 : : #define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */
140 : : #define EXT3_NODUMP_FL 0x00000040 /* do not dump file */
141 : : #define EXT3_NOATIME_FL 0x00000080 /* do not update atime */
142 : : /* Reserved for compression usage... */
143 : : #define EXT3_DIRTY_FL 0x00000100
144 : : #define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
145 : : #define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */
146 : : #define EXT3_ECOMPR_FL 0x00000800 /* Compression error */
147 : : /* End compression flags --- maybe not all used */
148 : : #define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */
149 : : #define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */
150 : : #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
151 : : #define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */
152 : : #define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
153 : : #define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
154 : : #define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */
155 : :
156 : : #define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
157 : : #define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
158 : :
159 : : /* Flags that should be inherited by new inodes from their parent. */
160 : : #define EXT3_FL_INHERITED (EXT3_SECRM_FL | EXT3_UNRM_FL | EXT3_COMPR_FL |\
161 : : EXT3_SYNC_FL | EXT3_NODUMP_FL |\
162 : : EXT3_NOATIME_FL | EXT3_COMPRBLK_FL |\
163 : : EXT3_NOCOMPR_FL | EXT3_JOURNAL_DATA_FL |\
164 : : EXT3_NOTAIL_FL | EXT3_DIRSYNC_FL)
165 : :
166 : : /* Flags that are appropriate for regular files (all but dir-specific ones). */
167 : : #define EXT3_REG_FLMASK (~(EXT3_DIRSYNC_FL | EXT3_TOPDIR_FL))
168 : :
169 : : /* Flags that are appropriate for non-directories/regular files. */
170 : : #define EXT3_OTHER_FLMASK (EXT3_NODUMP_FL | EXT3_NOATIME_FL)
171 : :
172 : : /* Mask out flags that are inappropriate for the given type of inode. */
173 : : static inline __u32 ext3_mask_flags(umode_t mode, __u32 flags)
174 : : {
175 [ # # ][ # # ]: 0 : if (S_ISDIR(mode))
176 : : return flags;
177 [ # # ]: 0 : else if (S_ISREG(mode))
178 : 0 : return flags & EXT3_REG_FLMASK;
179 : : else
180 : 0 : return flags & EXT3_OTHER_FLMASK;
181 : : }
182 : :
183 : : /* Used to pass group descriptor data when online resize is done */
184 : : struct ext3_new_group_input {
185 : : __u32 group; /* Group number for this data */
186 : : __u32 block_bitmap; /* Absolute block number of block bitmap */
187 : : __u32 inode_bitmap; /* Absolute block number of inode bitmap */
188 : : __u32 inode_table; /* Absolute block number of inode table start */
189 : : __u32 blocks_count; /* Total number of blocks in this group */
190 : : __u16 reserved_blocks; /* Number of reserved blocks in this group */
191 : : __u16 unused;
192 : : };
193 : :
194 : : /* The struct ext3_new_group_input in kernel space, with free_blocks_count */
195 : : struct ext3_new_group_data {
196 : : __u32 group;
197 : : __u32 block_bitmap;
198 : : __u32 inode_bitmap;
199 : : __u32 inode_table;
200 : : __u32 blocks_count;
201 : : __u16 reserved_blocks;
202 : : __u16 unused;
203 : : __u32 free_blocks_count;
204 : : };
205 : :
206 : :
207 : : /*
208 : : * ioctl commands
209 : : */
210 : : #define EXT3_IOC_GETFLAGS FS_IOC_GETFLAGS
211 : : #define EXT3_IOC_SETFLAGS FS_IOC_SETFLAGS
212 : : #define EXT3_IOC_GETVERSION _IOR('f', 3, long)
213 : : #define EXT3_IOC_SETVERSION _IOW('f', 4, long)
214 : : #define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
215 : : #define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input)
216 : : #define EXT3_IOC_GETVERSION_OLD FS_IOC_GETVERSION
217 : : #define EXT3_IOC_SETVERSION_OLD FS_IOC_SETVERSION
218 : : #ifdef CONFIG_JBD_DEBUG
219 : : #define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
220 : : #endif
221 : : #define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
222 : : #define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
223 : :
224 : : /*
225 : : * ioctl commands in 32 bit emulation
226 : : */
227 : : #define EXT3_IOC32_GETFLAGS FS_IOC32_GETFLAGS
228 : : #define EXT3_IOC32_SETFLAGS FS_IOC32_SETFLAGS
229 : : #define EXT3_IOC32_GETVERSION _IOR('f', 3, int)
230 : : #define EXT3_IOC32_SETVERSION _IOW('f', 4, int)
231 : : #define EXT3_IOC32_GETRSVSZ _IOR('f', 5, int)
232 : : #define EXT3_IOC32_SETRSVSZ _IOW('f', 6, int)
233 : : #define EXT3_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
234 : : #ifdef CONFIG_JBD_DEBUG
235 : : #define EXT3_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
236 : : #endif
237 : : #define EXT3_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
238 : : #define EXT3_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
239 : :
240 : :
241 : : /*
242 : : * Mount options
243 : : */
244 : : struct ext3_mount_options {
245 : : unsigned long s_mount_opt;
246 : : kuid_t s_resuid;
247 : : kgid_t s_resgid;
248 : : unsigned long s_commit_interval;
249 : : #ifdef CONFIG_QUOTA
250 : : int s_jquota_fmt;
251 : : char *s_qf_names[MAXQUOTAS];
252 : : #endif
253 : : };
254 : :
255 : : /*
256 : : * Structure of an inode on the disk
257 : : */
258 : : struct ext3_inode {
259 : : __le16 i_mode; /* File mode */
260 : : __le16 i_uid; /* Low 16 bits of Owner Uid */
261 : : __le32 i_size; /* Size in bytes */
262 : : __le32 i_atime; /* Access time */
263 : : __le32 i_ctime; /* Creation time */
264 : : __le32 i_mtime; /* Modification time */
265 : : __le32 i_dtime; /* Deletion Time */
266 : : __le16 i_gid; /* Low 16 bits of Group Id */
267 : : __le16 i_links_count; /* Links count */
268 : : __le32 i_blocks; /* Blocks count */
269 : : __le32 i_flags; /* File flags */
270 : : union {
271 : : struct {
272 : : __u32 l_i_reserved1;
273 : : } linux1;
274 : : struct {
275 : : __u32 h_i_translator;
276 : : } hurd1;
277 : : struct {
278 : : __u32 m_i_reserved1;
279 : : } masix1;
280 : : } osd1; /* OS dependent 1 */
281 : : __le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
282 : : __le32 i_generation; /* File version (for NFS) */
283 : : __le32 i_file_acl; /* File ACL */
284 : : __le32 i_dir_acl; /* Directory ACL */
285 : : __le32 i_faddr; /* Fragment address */
286 : : union {
287 : : struct {
288 : : __u8 l_i_frag; /* Fragment number */
289 : : __u8 l_i_fsize; /* Fragment size */
290 : : __u16 i_pad1;
291 : : __le16 l_i_uid_high; /* these 2 fields */
292 : : __le16 l_i_gid_high; /* were reserved2[0] */
293 : : __u32 l_i_reserved2;
294 : : } linux2;
295 : : struct {
296 : : __u8 h_i_frag; /* Fragment number */
297 : : __u8 h_i_fsize; /* Fragment size */
298 : : __u16 h_i_mode_high;
299 : : __u16 h_i_uid_high;
300 : : __u16 h_i_gid_high;
301 : : __u32 h_i_author;
302 : : } hurd2;
303 : : struct {
304 : : __u8 m_i_frag; /* Fragment number */
305 : : __u8 m_i_fsize; /* Fragment size */
306 : : __u16 m_pad1;
307 : : __u32 m_i_reserved2[2];
308 : : } masix2;
309 : : } osd2; /* OS dependent 2 */
310 : : __le16 i_extra_isize;
311 : : __le16 i_pad1;
312 : : };
313 : :
314 : : #define i_size_high i_dir_acl
315 : :
316 : : #define i_reserved1 osd1.linux1.l_i_reserved1
317 : : #define i_frag osd2.linux2.l_i_frag
318 : : #define i_fsize osd2.linux2.l_i_fsize
319 : : #define i_uid_low i_uid
320 : : #define i_gid_low i_gid
321 : : #define i_uid_high osd2.linux2.l_i_uid_high
322 : : #define i_gid_high osd2.linux2.l_i_gid_high
323 : : #define i_reserved2 osd2.linux2.l_i_reserved2
324 : :
325 : : /*
326 : : * File system states
327 : : */
328 : : #define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
329 : : #define EXT3_ERROR_FS 0x0002 /* Errors detected */
330 : : #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
331 : :
332 : : /*
333 : : * Misc. filesystem flags
334 : : */
335 : : #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
336 : : #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
337 : : #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
338 : :
339 : : /*
340 : : * Mount flags
341 : : */
342 : : #define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */
343 : : /* EXT3_MOUNT_OLDALLOC was there */
344 : : #define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */
345 : : #define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */
346 : : #define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
347 : : #define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
348 : : #define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
349 : : #define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
350 : : #define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
351 : : #define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */
352 : : #define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
353 : : #define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
354 : : #define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
355 : : #define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
356 : : #define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
357 : : #define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
358 : : #define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
359 : : #define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
360 : : #define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
361 : : #define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */
362 : : #define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */
363 : : #define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
364 : : #define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
365 : : #define EXT3_MOUNT_DATA_ERR_ABORT 0x400000 /* Abort on file data write
366 : : * error in ordered mode */
367 : :
368 : : /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
369 : : #ifndef _LINUX_EXT2_FS_H
370 : : #define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
371 : : #define set_opt(o, opt) o |= EXT3_MOUNT_##opt
372 : : #define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
373 : : EXT3_MOUNT_##opt)
374 : : #else
375 : : #define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
376 : : #define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
377 : : #define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
378 : : #endif
379 : :
380 : : #define ext3_set_bit __set_bit_le
381 : : #define ext3_set_bit_atomic ext2_set_bit_atomic
382 : : #define ext3_clear_bit __clear_bit_le
383 : : #define ext3_clear_bit_atomic ext2_clear_bit_atomic
384 : : #define ext3_test_bit test_bit_le
385 : : #define ext3_find_next_zero_bit find_next_zero_bit_le
386 : :
387 : : /*
388 : : * Maximal mount counts between two filesystem checks
389 : : */
390 : : #define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
391 : : #define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
392 : :
393 : : /*
394 : : * Behaviour when detecting errors
395 : : */
396 : : #define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
397 : : #define EXT3_ERRORS_RO 2 /* Remount fs read-only */
398 : : #define EXT3_ERRORS_PANIC 3 /* Panic */
399 : : #define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
400 : :
401 : : /*
402 : : * Structure of the super block
403 : : */
404 : : struct ext3_super_block {
405 : : /*00*/ __le32 s_inodes_count; /* Inodes count */
406 : : __le32 s_blocks_count; /* Blocks count */
407 : : __le32 s_r_blocks_count; /* Reserved blocks count */
408 : : __le32 s_free_blocks_count; /* Free blocks count */
409 : : /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
410 : : __le32 s_first_data_block; /* First Data Block */
411 : : __le32 s_log_block_size; /* Block size */
412 : : __le32 s_log_frag_size; /* Fragment size */
413 : : /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
414 : : __le32 s_frags_per_group; /* # Fragments per group */
415 : : __le32 s_inodes_per_group; /* # Inodes per group */
416 : : __le32 s_mtime; /* Mount time */
417 : : /*30*/ __le32 s_wtime; /* Write time */
418 : : __le16 s_mnt_count; /* Mount count */
419 : : __le16 s_max_mnt_count; /* Maximal mount count */
420 : : __le16 s_magic; /* Magic signature */
421 : : __le16 s_state; /* File system state */
422 : : __le16 s_errors; /* Behaviour when detecting errors */
423 : : __le16 s_minor_rev_level; /* minor revision level */
424 : : /*40*/ __le32 s_lastcheck; /* time of last check */
425 : : __le32 s_checkinterval; /* max. time between checks */
426 : : __le32 s_creator_os; /* OS */
427 : : __le32 s_rev_level; /* Revision level */
428 : : /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
429 : : __le16 s_def_resgid; /* Default gid for reserved blocks */
430 : : /*
431 : : * These fields are for EXT3_DYNAMIC_REV superblocks only.
432 : : *
433 : : * Note: the difference between the compatible feature set and
434 : : * the incompatible feature set is that if there is a bit set
435 : : * in the incompatible feature set that the kernel doesn't
436 : : * know about, it should refuse to mount the filesystem.
437 : : *
438 : : * e2fsck's requirements are more strict; if it doesn't know
439 : : * about a feature in either the compatible or incompatible
440 : : * feature set, it must abort and not try to meddle with
441 : : * things it doesn't understand...
442 : : */
443 : : __le32 s_first_ino; /* First non-reserved inode */
444 : : __le16 s_inode_size; /* size of inode structure */
445 : : __le16 s_block_group_nr; /* block group # of this superblock */
446 : : __le32 s_feature_compat; /* compatible feature set */
447 : : /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
448 : : __le32 s_feature_ro_compat; /* readonly-compatible feature set */
449 : : /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
450 : : /*78*/ char s_volume_name[16]; /* volume name */
451 : : /*88*/ char s_last_mounted[64]; /* directory where last mounted */
452 : : /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
453 : : /*
454 : : * Performance hints. Directory preallocation should only
455 : : * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
456 : : */
457 : : __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
458 : : __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
459 : : __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
460 : : /*
461 : : * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
462 : : */
463 : : /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
464 : : /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
465 : : __le32 s_journal_dev; /* device number of journal file */
466 : : __le32 s_last_orphan; /* start of list of inodes to delete */
467 : : __le32 s_hash_seed[4]; /* HTREE hash seed */
468 : : __u8 s_def_hash_version; /* Default hash version to use */
469 : : __u8 s_reserved_char_pad;
470 : : __u16 s_reserved_word_pad;
471 : : __le32 s_default_mount_opts;
472 : : __le32 s_first_meta_bg; /* First metablock block group */
473 : : __le32 s_mkfs_time; /* When the filesystem was created */
474 : : __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
475 : : /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
476 : : /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
477 : : __le32 s_r_blocks_count_hi; /* Reserved blocks count */
478 : : __le32 s_free_blocks_count_hi; /* Free blocks count */
479 : : __le16 s_min_extra_isize; /* All inodes have at least # bytes */
480 : : __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
481 : : __le32 s_flags; /* Miscellaneous flags */
482 : : __le16 s_raid_stride; /* RAID stride */
483 : : __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
484 : : __le64 s_mmp_block; /* Block for multi-mount protection */
485 : : __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
486 : : __u8 s_log_groups_per_flex; /* FLEX_BG group size */
487 : : __u8 s_reserved_char_pad2;
488 : : __le16 s_reserved_pad;
489 : : __u32 s_reserved[162]; /* Padding to the end of the block */
490 : : };
491 : :
492 : : /* data type for block offset of block group */
493 : : typedef int ext3_grpblk_t;
494 : :
495 : : /* data type for filesystem-wide blocks number */
496 : : typedef unsigned long ext3_fsblk_t;
497 : :
498 : : #define E3FSBLK "%lu"
499 : :
500 : : struct ext3_reserve_window {
501 : : ext3_fsblk_t _rsv_start; /* First byte reserved */
502 : : ext3_fsblk_t _rsv_end; /* Last byte reserved or 0 */
503 : : };
504 : :
505 : : struct ext3_reserve_window_node {
506 : : struct rb_node rsv_node;
507 : : __u32 rsv_goal_size;
508 : : __u32 rsv_alloc_hit;
509 : : struct ext3_reserve_window rsv_window;
510 : : };
511 : :
512 : : struct ext3_block_alloc_info {
513 : : /* information about reservation window */
514 : : struct ext3_reserve_window_node rsv_window_node;
515 : : /*
516 : : * was i_next_alloc_block in ext3_inode_info
517 : : * is the logical (file-relative) number of the
518 : : * most-recently-allocated block in this file.
519 : : * We use this for detecting linearly ascending allocation requests.
520 : : */
521 : : __u32 last_alloc_logical_block;
522 : : /*
523 : : * Was i_next_alloc_goal in ext3_inode_info
524 : : * is the *physical* companion to i_next_alloc_block.
525 : : * it the physical block number of the block which was most-recentl
526 : : * allocated to this file. This give us the goal (target) for the next
527 : : * allocation when we detect linearly ascending requests.
528 : : */
529 : : ext3_fsblk_t last_alloc_physical_block;
530 : : };
531 : :
532 : : #define rsv_start rsv_window._rsv_start
533 : : #define rsv_end rsv_window._rsv_end
534 : :
535 : : /*
536 : : * third extended file system inode data in memory
537 : : */
538 : : struct ext3_inode_info {
539 : : __le32 i_data[15]; /* unconverted */
540 : : __u32 i_flags;
541 : : #ifdef EXT3_FRAGMENTS
542 : : __u32 i_faddr;
543 : : __u8 i_frag_no;
544 : : __u8 i_frag_size;
545 : : #endif
546 : : ext3_fsblk_t i_file_acl;
547 : : __u32 i_dir_acl;
548 : : __u32 i_dtime;
549 : :
550 : : /*
551 : : * i_block_group is the number of the block group which contains
552 : : * this file's inode. Constant across the lifetime of the inode,
553 : : * it is ued for making block allocation decisions - we try to
554 : : * place a file's data blocks near its inode block, and new inodes
555 : : * near to their parent directory's inode.
556 : : */
557 : : __u32 i_block_group;
558 : : unsigned long i_state_flags; /* Dynamic state flags for ext3 */
559 : :
560 : : /* block reservation info */
561 : : struct ext3_block_alloc_info *i_block_alloc_info;
562 : :
563 : : __u32 i_dir_start_lookup;
564 : : #ifdef CONFIG_EXT3_FS_XATTR
565 : : /*
566 : : * Extended attributes can be read independently of the main file
567 : : * data. Taking i_mutex even when reading would cause contention
568 : : * between readers of EAs and writers of regular file data, so
569 : : * instead we synchronize on xattr_sem when reading or changing
570 : : * EAs.
571 : : */
572 : : struct rw_semaphore xattr_sem;
573 : : #endif
574 : :
575 : : struct list_head i_orphan; /* unlinked but open inodes */
576 : :
577 : : /*
578 : : * i_disksize keeps track of what the inode size is ON DISK, not
579 : : * in memory. During truncate, i_size is set to the new size by
580 : : * the VFS prior to calling ext3_truncate(), but the filesystem won't
581 : : * set i_disksize to 0 until the truncate is actually under way.
582 : : *
583 : : * The intent is that i_disksize always represents the blocks which
584 : : * are used by this file. This allows recovery to restart truncate
585 : : * on orphans if we crash during truncate. We actually write i_disksize
586 : : * into the on-disk inode when writing inodes out, instead of i_size.
587 : : *
588 : : * The only time when i_disksize and i_size may be different is when
589 : : * a truncate is in progress. The only things which change i_disksize
590 : : * are ext3_get_block (growth) and ext3_truncate (shrinkth).
591 : : */
592 : : loff_t i_disksize;
593 : :
594 : : /* on-disk additional length */
595 : : __u16 i_extra_isize;
596 : :
597 : : /*
598 : : * truncate_mutex is for serialising ext3_truncate() against
599 : : * ext3_getblock(). In the 2.4 ext2 design, great chunks of inode's
600 : : * data tree are chopped off during truncate. We can't do that in
601 : : * ext3 because whenever we perform intermediate commits during
602 : : * truncate, the inode and all the metadata blocks *must* be in a
603 : : * consistent state which allows truncation of the orphans to restart
604 : : * during recovery. Hence we must fix the get_block-vs-truncate race
605 : : * by other means, so we have truncate_mutex.
606 : : */
607 : : struct mutex truncate_mutex;
608 : :
609 : : /*
610 : : * Transactions that contain inode's metadata needed to complete
611 : : * fsync and fdatasync, respectively.
612 : : */
613 : : atomic_t i_sync_tid;
614 : : atomic_t i_datasync_tid;
615 : :
616 : : struct inode vfs_inode;
617 : : };
618 : :
619 : : /*
620 : : * third extended-fs super-block data in memory
621 : : */
622 : : struct ext3_sb_info {
623 : : unsigned long s_frag_size; /* Size of a fragment in bytes */
624 : : unsigned long s_frags_per_block;/* Number of fragments per block */
625 : : unsigned long s_inodes_per_block;/* Number of inodes per block */
626 : : unsigned long s_frags_per_group;/* Number of fragments in a group */
627 : : unsigned long s_blocks_per_group;/* Number of blocks in a group */
628 : : unsigned long s_inodes_per_group;/* Number of inodes in a group */
629 : : unsigned long s_itb_per_group; /* Number of inode table blocks per group */
630 : : unsigned long s_gdb_count; /* Number of group descriptor blocks */
631 : : unsigned long s_desc_per_block; /* Number of group descriptors per block */
632 : : unsigned long s_groups_count; /* Number of groups in the fs */
633 : : unsigned long s_overhead_last; /* Last calculated overhead */
634 : : unsigned long s_blocks_last; /* Last seen block count */
635 : : struct buffer_head * s_sbh; /* Buffer containing the super block */
636 : : struct ext3_super_block * s_es; /* Pointer to the super block in the buffer */
637 : : struct buffer_head ** s_group_desc;
638 : : unsigned long s_mount_opt;
639 : : ext3_fsblk_t s_sb_block;
640 : : kuid_t s_resuid;
641 : : kgid_t s_resgid;
642 : : unsigned short s_mount_state;
643 : : unsigned short s_pad;
644 : : int s_addr_per_block_bits;
645 : : int s_desc_per_block_bits;
646 : : int s_inode_size;
647 : : int s_first_ino;
648 : : spinlock_t s_next_gen_lock;
649 : : u32 s_next_generation;
650 : : u32 s_hash_seed[4];
651 : : int s_def_hash_version;
652 : : int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
653 : : struct percpu_counter s_freeblocks_counter;
654 : : struct percpu_counter s_freeinodes_counter;
655 : : struct percpu_counter s_dirs_counter;
656 : : struct blockgroup_lock *s_blockgroup_lock;
657 : :
658 : : /* root of the per fs reservation window tree */
659 : : spinlock_t s_rsv_window_lock;
660 : : struct rb_root s_rsv_window_root;
661 : : struct ext3_reserve_window_node s_rsv_window_head;
662 : :
663 : : /* Journaling */
664 : : struct inode * s_journal_inode;
665 : : struct journal_s * s_journal;
666 : : struct list_head s_orphan;
667 : : struct mutex s_orphan_lock;
668 : : struct mutex s_resize_lock;
669 : : unsigned long s_commit_interval;
670 : : struct block_device *journal_bdev;
671 : : #ifdef CONFIG_QUOTA
672 : : char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
673 : : int s_jquota_fmt; /* Format of quota to use */
674 : : #endif
675 : : };
676 : :
677 : : static inline spinlock_t *
678 : : sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group)
679 : : {
680 : : return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
681 : : }
682 : :
683 : : static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
684 : : {
685 : : return sb->s_fs_info;
686 : : }
687 : : static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
688 : : {
689 : : return container_of(inode, struct ext3_inode_info, vfs_inode);
690 : : }
691 : :
692 : 0 : static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
693 : : {
694 : 0 : return ino == EXT3_ROOT_INO ||
695 [ # # ][ # # ]: 0 : ino == EXT3_JOURNAL_INO ||
696 [ # # ][ # # ]: 0 : ino == EXT3_RESIZE_INO ||
[ # # ][ # # ]
697 [ # # ][ # # ]: 0 : (ino >= EXT3_FIRST_INO(sb) &&
698 : 0 : ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
699 : : }
700 : :
701 : : /*
702 : : * Inode dynamic state flags
703 : : */
704 : : enum {
705 : : EXT3_STATE_JDATA, /* journaled data exists */
706 : : EXT3_STATE_NEW, /* inode is newly created */
707 : : EXT3_STATE_XATTR, /* has in-inode xattrs */
708 : : EXT3_STATE_FLUSH_ON_CLOSE, /* flush dirty pages on close */
709 : : };
710 : :
711 : : static inline int ext3_test_inode_state(struct inode *inode, int bit)
712 : : {
713 : : return test_bit(bit, &EXT3_I(inode)->i_state_flags);
714 : : }
715 : :
716 : : static inline void ext3_set_inode_state(struct inode *inode, int bit)
717 : : {
718 : 0 : set_bit(bit, &EXT3_I(inode)->i_state_flags);
719 : : }
720 : :
721 : : static inline void ext3_clear_inode_state(struct inode *inode, int bit)
722 : : {
723 : 0 : clear_bit(bit, &EXT3_I(inode)->i_state_flags);
724 : : }
725 : :
726 : : #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
727 : :
728 : : /*
729 : : * Codes for operating systems
730 : : */
731 : : #define EXT3_OS_LINUX 0
732 : : #define EXT3_OS_HURD 1
733 : : #define EXT3_OS_MASIX 2
734 : : #define EXT3_OS_FREEBSD 3
735 : : #define EXT3_OS_LITES 4
736 : :
737 : : /*
738 : : * Revision levels
739 : : */
740 : : #define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
741 : : #define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
742 : :
743 : : #define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
744 : : #define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
745 : :
746 : : #define EXT3_GOOD_OLD_INODE_SIZE 128
747 : :
748 : : /*
749 : : * Feature set definitions
750 : : */
751 : :
752 : : #define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
753 : : ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
754 : : #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
755 : : ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
756 : : #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
757 : : ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
758 : : #define EXT3_SET_COMPAT_FEATURE(sb,mask) \
759 : : EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
760 : : #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
761 : : EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
762 : : #define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
763 : : EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
764 : : #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
765 : : EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
766 : : #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
767 : : EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
768 : : #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
769 : : EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
770 : :
771 : : #define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
772 : : #define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
773 : : #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
774 : : #define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
775 : : #define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
776 : : #define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
777 : :
778 : : #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
779 : : #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
780 : : #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
781 : :
782 : : #define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
783 : : #define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
784 : : #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
785 : : #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
786 : : #define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
787 : :
788 : : #define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
789 : : #define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \
790 : : EXT3_FEATURE_INCOMPAT_RECOVER| \
791 : : EXT3_FEATURE_INCOMPAT_META_BG)
792 : : #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
793 : : EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
794 : : EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
795 : :
796 : : /*
797 : : * Default values for user and/or group using reserved blocks
798 : : */
799 : : #define EXT3_DEF_RESUID 0
800 : : #define EXT3_DEF_RESGID 0
801 : :
802 : : /*
803 : : * Default mount options
804 : : */
805 : : #define EXT3_DEFM_DEBUG 0x0001
806 : : #define EXT3_DEFM_BSDGROUPS 0x0002
807 : : #define EXT3_DEFM_XATTR_USER 0x0004
808 : : #define EXT3_DEFM_ACL 0x0008
809 : : #define EXT3_DEFM_UID16 0x0010
810 : : #define EXT3_DEFM_JMODE 0x0060
811 : : #define EXT3_DEFM_JMODE_DATA 0x0020
812 : : #define EXT3_DEFM_JMODE_ORDERED 0x0040
813 : : #define EXT3_DEFM_JMODE_WBACK 0x0060
814 : :
815 : : /*
816 : : * Structure of a directory entry
817 : : */
818 : : #define EXT3_NAME_LEN 255
819 : :
820 : : struct ext3_dir_entry {
821 : : __le32 inode; /* Inode number */
822 : : __le16 rec_len; /* Directory entry length */
823 : : __le16 name_len; /* Name length */
824 : : char name[EXT3_NAME_LEN]; /* File name */
825 : : };
826 : :
827 : : /*
828 : : * The new version of the directory entry. Since EXT3 structures are
829 : : * stored in intel byte order, and the name_len field could never be
830 : : * bigger than 255 chars, it's safe to reclaim the extra byte for the
831 : : * file_type field.
832 : : */
833 : : struct ext3_dir_entry_2 {
834 : : __le32 inode; /* Inode number */
835 : : __le16 rec_len; /* Directory entry length */
836 : : __u8 name_len; /* Name length */
837 : : __u8 file_type;
838 : : char name[EXT3_NAME_LEN]; /* File name */
839 : : };
840 : :
841 : : /*
842 : : * Ext3 directory file types. Only the low 3 bits are used. The
843 : : * other bits are reserved for now.
844 : : */
845 : : #define EXT3_FT_UNKNOWN 0
846 : : #define EXT3_FT_REG_FILE 1
847 : : #define EXT3_FT_DIR 2
848 : : #define EXT3_FT_CHRDEV 3
849 : : #define EXT3_FT_BLKDEV 4
850 : : #define EXT3_FT_FIFO 5
851 : : #define EXT3_FT_SOCK 6
852 : : #define EXT3_FT_SYMLINK 7
853 : :
854 : : #define EXT3_FT_MAX 8
855 : :
856 : : /*
857 : : * EXT3_DIR_PAD defines the directory entries boundaries
858 : : *
859 : : * NOTE: It must be a multiple of 4
860 : : */
861 : : #define EXT3_DIR_PAD 4
862 : : #define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
863 : : #define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
864 : : ~EXT3_DIR_ROUND)
865 : : #define EXT3_MAX_REC_LEN ((1<<16)-1)
866 : :
867 : : /*
868 : : * Tests against MAX_REC_LEN etc were put in place for 64k block
869 : : * sizes; if that is not possible on this arch, we can skip
870 : : * those tests and speed things up.
871 : : */
872 : : static inline unsigned ext3_rec_len_from_disk(__le16 dlen)
873 : : {
874 : 0 : unsigned len = le16_to_cpu(dlen);
875 : :
876 : : #if (PAGE_CACHE_SIZE >= 65536)
877 : : if (len == EXT3_MAX_REC_LEN)
878 : : return 1 << 16;
879 : : #endif
880 : : return len;
881 : : }
882 : :
883 : : static inline __le16 ext3_rec_len_to_disk(unsigned len)
884 : : {
885 : : #if (PAGE_CACHE_SIZE >= 65536)
886 : : if (len == (1 << 16))
887 : : return cpu_to_le16(EXT3_MAX_REC_LEN);
888 : : else if (len > (1 << 16))
889 : : BUG();
890 : : #endif
891 : 0 : return cpu_to_le16(len);
892 : : }
893 : :
894 : : /*
895 : : * Hash Tree Directory indexing
896 : : * (c) Daniel Phillips, 2001
897 : : */
898 : :
899 : : #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
900 : : EXT3_FEATURE_COMPAT_DIR_INDEX) && \
901 : : (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
902 : : #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
903 : : #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
904 : :
905 : : /* Legal values for the dx_root hash_version field: */
906 : :
907 : : #define DX_HASH_LEGACY 0
908 : : #define DX_HASH_HALF_MD4 1
909 : : #define DX_HASH_TEA 2
910 : : #define DX_HASH_LEGACY_UNSIGNED 3
911 : : #define DX_HASH_HALF_MD4_UNSIGNED 4
912 : : #define DX_HASH_TEA_UNSIGNED 5
913 : :
914 : : /* hash info structure used by the directory hash */
915 : : struct dx_hash_info
916 : : {
917 : : u32 hash;
918 : : u32 minor_hash;
919 : : int hash_version;
920 : : u32 *seed;
921 : : };
922 : :
923 : :
924 : : /* 32 and 64 bit signed EOF for dx directories */
925 : : #define EXT3_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
926 : : #define EXT3_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
927 : :
928 : :
929 : : /*
930 : : * Control parameters used by ext3_htree_next_block
931 : : */
932 : : #define HASH_NB_ALWAYS 1
933 : :
934 : :
935 : : /*
936 : : * Describe an inode's exact location on disk and in memory
937 : : */
938 : : struct ext3_iloc
939 : : {
940 : : struct buffer_head *bh;
941 : : unsigned long offset;
942 : : unsigned long block_group;
943 : : };
944 : :
945 : : static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
946 : : {
947 : 0 : return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
948 : : }
949 : :
950 : : /*
951 : : * This structure is stuffed into the struct file's private_data field
952 : : * for directories. It is where we put information so that we can do
953 : : * readdir operations in hash tree order.
954 : : */
955 : : struct dir_private_info {
956 : : struct rb_root root;
957 : : struct rb_node *curr_node;
958 : : struct fname *extra_fname;
959 : : loff_t last_pos;
960 : : __u32 curr_hash;
961 : : __u32 curr_minor_hash;
962 : : __u32 next_hash;
963 : : };
964 : :
965 : : /* calculate the first block number of the group */
966 : : static inline ext3_fsblk_t
967 : 0 : ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
968 : : {
969 : 0 : return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
970 : 0 : le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
971 : : }
972 : :
973 : : /*
974 : : * Special error return code only used by dx_probe() and its callers.
975 : : */
976 : : #define ERR_BAD_DX_DIR -75000
977 : :
978 : : /*
979 : : * Function prototypes
980 : : */
981 : :
982 : : /*
983 : : * Ok, these declarations are also in <linux/kernel.h> but none of the
984 : : * ext3 source programs needs to include it so they are duplicated here.
985 : : */
986 : : # define NORET_TYPE /**/
987 : : # define ATTRIB_NORET __attribute__((noreturn))
988 : : # define NORET_AND noreturn,
989 : :
990 : : /* balloc.c */
991 : : extern int ext3_bg_has_super(struct super_block *sb, int group);
992 : : extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
993 : : extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
994 : : ext3_fsblk_t goal, int *errp);
995 : : extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
996 : : ext3_fsblk_t goal, unsigned long *count, int *errp);
997 : : extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
998 : : ext3_fsblk_t block, unsigned long count);
999 : : extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
1000 : : ext3_fsblk_t block, unsigned long count,
1001 : : unsigned long *pdquot_freed_blocks);
1002 : : extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
1003 : : extern void ext3_check_blocks_bitmap (struct super_block *);
1004 : : extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
1005 : : unsigned int block_group,
1006 : : struct buffer_head ** bh);
1007 : : extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
1008 : : extern void ext3_init_block_alloc_info(struct inode *);
1009 : : extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
1010 : : extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range);
1011 : :
1012 : : /* dir.c */
1013 : : extern int ext3_check_dir_entry(const char *, struct inode *,
1014 : : struct ext3_dir_entry_2 *,
1015 : : struct buffer_head *, unsigned long);
1016 : : extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
1017 : : __u32 minor_hash,
1018 : : struct ext3_dir_entry_2 *dirent);
1019 : : extern void ext3_htree_free_dir_info(struct dir_private_info *p);
1020 : :
1021 : : /* fsync.c */
1022 : : extern int ext3_sync_file(struct file *, loff_t, loff_t, int);
1023 : :
1024 : : /* hash.c */
1025 : : extern int ext3fs_dirhash(const char *name, int len, struct
1026 : : dx_hash_info *hinfo);
1027 : :
1028 : : /* ialloc.c */
1029 : : extern struct inode * ext3_new_inode (handle_t *, struct inode *,
1030 : : const struct qstr *, umode_t);
1031 : : extern void ext3_free_inode (handle_t *, struct inode *);
1032 : : extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
1033 : : extern unsigned long ext3_count_free_inodes (struct super_block *);
1034 : : extern unsigned long ext3_count_dirs (struct super_block *);
1035 : : extern void ext3_check_inodes_bitmap (struct super_block *);
1036 : : extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
1037 : :
1038 : :
1039 : : /* inode.c */
1040 : : int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
1041 : : struct buffer_head *bh, ext3_fsblk_t blocknr);
1042 : : struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
1043 : : struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
1044 : : int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
1045 : : sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
1046 : : int create);
1047 : :
1048 : : extern struct inode *ext3_iget(struct super_block *, unsigned long);
1049 : : extern int ext3_write_inode (struct inode *, struct writeback_control *);
1050 : : extern int ext3_setattr (struct dentry *, struct iattr *);
1051 : : extern void ext3_evict_inode (struct inode *);
1052 : : extern int ext3_sync_inode (handle_t *, struct inode *);
1053 : : extern void ext3_discard_reservation (struct inode *);
1054 : : extern void ext3_dirty_inode(struct inode *, int);
1055 : : extern int ext3_change_inode_journal_flag(struct inode *, int);
1056 : : extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
1057 : : extern int ext3_can_truncate(struct inode *inode);
1058 : : extern void ext3_truncate(struct inode *inode);
1059 : : extern void ext3_set_inode_flags(struct inode *);
1060 : : extern void ext3_get_inode_flags(struct ext3_inode_info *);
1061 : : extern void ext3_set_aops(struct inode *inode);
1062 : : extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1063 : : u64 start, u64 len);
1064 : :
1065 : : /* ioctl.c */
1066 : : extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
1067 : : extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
1068 : :
1069 : : /* namei.c */
1070 : : extern int ext3_orphan_add(handle_t *, struct inode *);
1071 : : extern int ext3_orphan_del(handle_t *, struct inode *);
1072 : : extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1073 : : __u32 start_minor_hash, __u32 *next_hash);
1074 : :
1075 : : /* resize.c */
1076 : : extern int ext3_group_add(struct super_block *sb,
1077 : : struct ext3_new_group_data *input);
1078 : : extern int ext3_group_extend(struct super_block *sb,
1079 : : struct ext3_super_block *es,
1080 : : ext3_fsblk_t n_blocks_count);
1081 : :
1082 : : /* super.c */
1083 : : extern __printf(3, 4)
1084 : : void ext3_error(struct super_block *, const char *, const char *, ...);
1085 : : extern void __ext3_std_error (struct super_block *, const char *, int);
1086 : : extern __printf(3, 4)
1087 : : void ext3_abort(struct super_block *, const char *, const char *, ...);
1088 : : extern __printf(3, 4)
1089 : : void ext3_warning(struct super_block *, const char *, const char *, ...);
1090 : : extern __printf(3, 4)
1091 : : void ext3_msg(struct super_block *, const char *, const char *, ...);
1092 : : extern void ext3_update_dynamic_rev (struct super_block *sb);
1093 : :
1094 : : #define ext3_std_error(sb, errno) \
1095 : : do { \
1096 : : if ((errno)) \
1097 : : __ext3_std_error((sb), __func__, (errno)); \
1098 : : } while (0)
1099 : :
1100 : : /*
1101 : : * Inodes and files operations
1102 : : */
1103 : :
1104 : : /* dir.c */
1105 : : extern const struct file_operations ext3_dir_operations;
1106 : :
1107 : : /* file.c */
1108 : : extern const struct inode_operations ext3_file_inode_operations;
1109 : : extern const struct file_operations ext3_file_operations;
1110 : :
1111 : : /* namei.c */
1112 : : extern const struct inode_operations ext3_dir_inode_operations;
1113 : : extern const struct inode_operations ext3_special_inode_operations;
1114 : :
1115 : : /* symlink.c */
1116 : : extern const struct inode_operations ext3_symlink_inode_operations;
1117 : : extern const struct inode_operations ext3_fast_symlink_inode_operations;
1118 : :
1119 : : #define EXT3_JOURNAL(inode) (EXT3_SB((inode)->i_sb)->s_journal)
1120 : :
1121 : : /* Define the number of blocks we need to account to a transaction to
1122 : : * modify one block of data.
1123 : : *
1124 : : * We may have to touch one inode, one bitmap buffer, up to three
1125 : : * indirection blocks, the group and superblock summaries, and the data
1126 : : * block to complete the transaction. */
1127 : :
1128 : : #define EXT3_SINGLEDATA_TRANS_BLOCKS 8U
1129 : :
1130 : : /* Extended attribute operations touch at most two data buffers,
1131 : : * two bitmap buffers, and two group summaries, in addition to the inode
1132 : : * and the superblock, which are already accounted for. */
1133 : :
1134 : : #define EXT3_XATTR_TRANS_BLOCKS 6U
1135 : :
1136 : : /* Define the minimum size for a transaction which modifies data. This
1137 : : * needs to take into account the fact that we may end up modifying two
1138 : : * quota files too (one for the group, one for the user quota). The
1139 : : * superblock only gets updated once, of course, so don't bother
1140 : : * counting that again for the quota updates. */
1141 : :
1142 : : #define EXT3_DATA_TRANS_BLOCKS(sb) (EXT3_SINGLEDATA_TRANS_BLOCKS + \
1143 : : EXT3_XATTR_TRANS_BLOCKS - 2 + \
1144 : : EXT3_MAXQUOTAS_TRANS_BLOCKS(sb))
1145 : :
1146 : : /* Delete operations potentially hit one directory's namespace plus an
1147 : : * entire inode, plus arbitrary amounts of bitmap/indirection data. Be
1148 : : * generous. We can grow the delete transaction later if necessary. */
1149 : :
1150 : : #define EXT3_DELETE_TRANS_BLOCKS(sb) (EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) + 64)
1151 : :
1152 : : /* Define an arbitrary limit for the amount of data we will anticipate
1153 : : * writing to any given transaction. For unbounded transactions such as
1154 : : * write(2) and truncate(2) we can write more than this, but we always
1155 : : * start off at the maximum transaction size and grow the transaction
1156 : : * optimistically as we go. */
1157 : :
1158 : : #define EXT3_MAX_TRANS_DATA 64U
1159 : :
1160 : : /* We break up a large truncate or write transaction once the handle's
1161 : : * buffer credits gets this low, we need either to extend the
1162 : : * transaction or to start a new one. Reserve enough space here for
1163 : : * inode, bitmap, superblock, group and indirection updates for at least
1164 : : * one block, plus two quota updates. Quota allocations are not
1165 : : * needed. */
1166 : :
1167 : : #define EXT3_RESERVE_TRANS_BLOCKS 12U
1168 : :
1169 : : #define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8
1170 : :
1171 : : #ifdef CONFIG_QUOTA
1172 : : /* Amount of blocks needed for quota update - we know that the structure was
1173 : : * allocated so we need to update only inode+data */
1174 : : #define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
1175 : : /* Amount of blocks needed for quota insert/delete - we do some block writes
1176 : : * but inode, sb and group updates are done only once */
1177 : : #define EXT3_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
1178 : : (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
1179 : : #define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
1180 : : (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
1181 : : #else
1182 : : #define EXT3_QUOTA_TRANS_BLOCKS(sb) 0
1183 : : #define EXT3_QUOTA_INIT_BLOCKS(sb) 0
1184 : : #define EXT3_QUOTA_DEL_BLOCKS(sb) 0
1185 : : #endif
1186 : : #define EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_TRANS_BLOCKS(sb))
1187 : : #define EXT3_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_INIT_BLOCKS(sb))
1188 : : #define EXT3_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_DEL_BLOCKS(sb))
1189 : :
1190 : : int
1191 : : ext3_mark_iloc_dirty(handle_t *handle,
1192 : : struct inode *inode,
1193 : : struct ext3_iloc *iloc);
1194 : :
1195 : : /*
1196 : : * On success, We end up with an outstanding reference count against
1197 : : * iloc->bh. This _must_ be cleaned up later.
1198 : : */
1199 : :
1200 : : int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
1201 : : struct ext3_iloc *iloc);
1202 : :
1203 : : int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
1204 : :
1205 : : /*
1206 : : * Wrapper functions with which ext3 calls into JBD. The intent here is
1207 : : * to allow these to be turned into appropriate stubs so ext3 can control
1208 : : * ext2 filesystems, so ext2+ext3 systems only nee one fs. This work hasn't
1209 : : * been done yet.
1210 : : */
1211 : :
1212 : : static inline void ext3_journal_release_buffer(handle_t *handle,
1213 : : struct buffer_head *bh)
1214 : : {
1215 : 0 : journal_release_buffer(handle, bh);
1216 : : }
1217 : :
1218 : : void ext3_journal_abort_handle(const char *caller, const char *err_fn,
1219 : : struct buffer_head *bh, handle_t *handle, int err);
1220 : :
1221 : : int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
1222 : : struct buffer_head *bh);
1223 : :
1224 : : int __ext3_journal_get_write_access(const char *where, handle_t *handle,
1225 : : struct buffer_head *bh);
1226 : :
1227 : : int __ext3_journal_forget(const char *where, handle_t *handle,
1228 : : struct buffer_head *bh);
1229 : :
1230 : : int __ext3_journal_revoke(const char *where, handle_t *handle,
1231 : : unsigned long blocknr, struct buffer_head *bh);
1232 : :
1233 : : int __ext3_journal_get_create_access(const char *where,
1234 : : handle_t *handle, struct buffer_head *bh);
1235 : :
1236 : : int __ext3_journal_dirty_metadata(const char *where,
1237 : : handle_t *handle, struct buffer_head *bh);
1238 : :
1239 : : #define ext3_journal_get_undo_access(handle, bh) \
1240 : : __ext3_journal_get_undo_access(__func__, (handle), (bh))
1241 : : #define ext3_journal_get_write_access(handle, bh) \
1242 : : __ext3_journal_get_write_access(__func__, (handle), (bh))
1243 : : #define ext3_journal_revoke(handle, blocknr, bh) \
1244 : : __ext3_journal_revoke(__func__, (handle), (blocknr), (bh))
1245 : : #define ext3_journal_get_create_access(handle, bh) \
1246 : : __ext3_journal_get_create_access(__func__, (handle), (bh))
1247 : : #define ext3_journal_dirty_metadata(handle, bh) \
1248 : : __ext3_journal_dirty_metadata(__func__, (handle), (bh))
1249 : : #define ext3_journal_forget(handle, bh) \
1250 : : __ext3_journal_forget(__func__, (handle), (bh))
1251 : :
1252 : : int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
1253 : :
1254 : : handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
1255 : : int __ext3_journal_stop(const char *where, handle_t *handle);
1256 : :
1257 : : static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
1258 : : {
1259 : 0 : return ext3_journal_start_sb(inode->i_sb, nblocks);
1260 : : }
1261 : :
1262 : : #define ext3_journal_stop(handle) \
1263 : : __ext3_journal_stop(__func__, (handle))
1264 : :
1265 : : static inline handle_t *ext3_journal_current_handle(void)
1266 : : {
1267 : : return journal_current_handle();
1268 : : }
1269 : :
1270 : : static inline int ext3_journal_extend(handle_t *handle, int nblocks)
1271 : : {
1272 : 0 : return journal_extend(handle, nblocks);
1273 : : }
1274 : :
1275 : : static inline int ext3_journal_restart(handle_t *handle, int nblocks)
1276 : : {
1277 : 0 : return journal_restart(handle, nblocks);
1278 : : }
1279 : :
1280 : : static inline int ext3_journal_blocks_per_page(struct inode *inode)
1281 : : {
1282 : 0 : return journal_blocks_per_page(inode);
1283 : : }
1284 : :
1285 : : static inline int ext3_journal_force_commit(journal_t *journal)
1286 : : {
1287 : 0 : return journal_force_commit(journal);
1288 : : }
1289 : :
1290 : : /* super.c */
1291 : : int ext3_force_commit(struct super_block *sb);
1292 : :
1293 : : static inline int ext3_should_journal_data(struct inode *inode)
1294 : : {
1295 [ # # ]: 0 : if (!S_ISREG(inode->i_mode))
[ # # # # ]
[ # # ][ # # ]
[ # # ]
1296 : : return 1;
1297 [ # # ][ # # ]: 0 : if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
[ # # ][ # # ]
[ # # ][ # # ]
1298 : : return 1;
1299 [ # # ][ # # ]: 0 : if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
[ # # ][ # # ]
[ # # ][ # # ]
1300 : : return 1;
1301 : : return 0;
1302 : : }
1303 : :
1304 : : static inline int ext3_should_order_data(struct inode *inode)
1305 : : {
1306 [ # # ][ # # ]: 0 : if (!S_ISREG(inode->i_mode))
1307 : : return 0;
1308 [ # # ][ # # ]: 0 : if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1309 : : return 0;
1310 [ # # ][ # # ]: 0 : if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
1311 : : return 1;
1312 : : return 0;
1313 : : }
1314 : :
1315 : : static inline int ext3_should_writeback_data(struct inode *inode)
1316 : : {
1317 [ # # ][ # # ]: 0 : if (!S_ISREG(inode->i_mode))
[ # # ]
1318 : : return 0;
1319 [ # # ][ # # ]: 0 : if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
[ # # ]
1320 : : return 0;
1321 [ # # ][ # # ]: 0 : if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
[ # # ]
1322 : : return 1;
1323 : : return 0;
1324 : : }
1325 : :
1326 : : #include <trace/events/ext3.h>
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