Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ext3.h
Go to the documentation of this file.
1 /*
2  * Written by Stephen C. Tweedie <[email protected]>, 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 ([email protected])
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  */
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 */
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  if (S_ISDIR(mode))
176  return flags;
177  else if (S_ISREG(mode))
178  return flags & EXT3_REG_FLMASK;
179  else
180  return flags & EXT3_OTHER_FLMASK;
181 }
182 
183 /* Used to pass group descriptor data when online resize is done */
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 */
192 };
193 
194 /* The struct ext3_new_group_input in kernel space, with 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  */
245  unsigned long s_mount_opt;
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 {
273  } linux1;
274  struct {
276  } hurd1;
277  struct {
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 */
291  __le16 l_i_uid_high; /* these 2 fields */
292  __le16 l_i_gid_high; /* were reserved2[0] */
294  } linux2;
295  struct {
296  __u8 h_i_frag; /* Fragment number */
297  __u8 h_i_fsize; /* Fragment size */
302  } hurd2;
303  struct {
304  __u8 m_i_frag; /* Fragment number */
305  __u8 m_i_fsize; /* Fragment size */
308  } masix2;
309  } osd2; /* OS dependent 2 */
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
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  */
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 */
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 */
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 */
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;
498 #define E3FSBLK "%lu"
501  ext3_fsblk_t _rsv_start; /* First byte reserved */
502  ext3_fsblk_t _rsv_end; /* Last byte reserved or 0 */
503 };
510 };
512 struct ext3_block_alloc_info {
513  /* information about reservation window */
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  */
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  */
530 };
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  */
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
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  */
558  unsigned long i_state_flags; /* Dynamic state flags for ext3 */
559 
560  /* block reservation info */
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
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 */
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  */
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;
642  unsigned short s_mount_state;
643  unsigned short s_pad;
652  int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
657 
658  /* root of the per fs reservation window tree */
662 
663  /* Journaling */
665  struct journal_s * s_journal;
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 static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
693 {
694  return ino == EXT3_ROOT_INO ||
695  ino == EXT3_JOURNAL_INO ||
696  ino == EXT3_RESIZE_INO ||
697  (ino >= EXT3_FIRST_INO(sb) &&
698  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  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  clear_bit(bit, &EXT3_I(inode)->i_state_flags);
724 }
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 */
743 #define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
744 #define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
746 #define EXT3_GOOD_OLD_INODE_SIZE 128
747 
748 /*
749  * Feature set definitions
750  */
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)
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
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
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
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
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  */
834  __le32 inode; /* Inode number */
835  __le16 rec_len; /* Directory entry length */
836  __u8 name_len; /* Name length */
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
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  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))
888  else if (len > (1 << 16))
889  BUG();
890 #endif
891  return cpu_to_le16(len);
892 }
893 
894 /*
895  * Hash Tree Directory indexing
896  * (c) Daniel Phillips, 2001
897  */
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: */
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 {
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  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  */
956  struct rb_root root;
959  loff_t last_pos;
963 };
964 
965 /* calculate the first block number of the group */
966 static inline ext3_fsblk_t
967 ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
968 {
969  return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
970  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);
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);
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;
1114 
1115 /* symlink.c */
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. */
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. */
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. */
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. */
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. */
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. */
1167 #define EXT3_RESERVE_TRANS_BLOCKS 12U
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  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);
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  return ext3_journal_start_sb(inode->i_sb, nblocks);
1260 }
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  return journal_extend(handle, nblocks);
1273 }
1274 
1275 static inline int ext3_journal_restart(handle_t *handle, int nblocks)
1276 {
1277  return journal_restart(handle, nblocks);
1278 }
1279 
1280 static inline int ext3_journal_blocks_per_page(struct inode *inode)
1281 {
1282  return journal_blocks_per_page(inode);
1283 }
1284 
1285 static inline int ext3_journal_force_commit(journal_t *journal)
1286 {
1287  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  if (!S_ISREG(inode->i_mode))
1296  return 1;
1297  if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
1298  return 1;
1299  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  if (!S_ISREG(inode->i_mode))
1307  return 0;
1308  if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1309  return 0;
1310  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  if (!S_ISREG(inode->i_mode))
1318  return 0;
1319  if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1320  return 0;
1321  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>