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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 */
102struct 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. */
173static 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 */
184struct 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 */
195struct 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 */
244struct 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 */
258struct 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 */
404struct 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 */
493typedef int ext3_grpblk_t;
494
495/* data type for filesystem-wide blocks number */
496typedef unsigned long ext3_fsblk_t;
497
498#define E3FSBLK "%lu"
499
500struct 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
505struct 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
512struct 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 */
538struct 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 */
622struct 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
677static inline spinlock_t *
678sb_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
683static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
684{
685 return sb->s_fs_info;
686}
687static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
688{
689 return container_of(inode, struct ext3_inode_info, vfs_inode);
690}
691
692static 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 */
704enum {
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
711static 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
716static inline void ext3_set_inode_state(struct inode *inode, int bit)
717{
718 set_bit(bit, &EXT3_I(inode)->i_state_flags);
719}
720
721static inline void ext3_clear_inode_state(struct inode *inode, int bit)
722{
723 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
820struct 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 */
833struct 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 */
872static 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
883static 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 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 */
915struct 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 */
938struct ext3_iloc
939{
940 struct buffer_head *bh;
941 unsigned long offset;
942 unsigned long block_group;
943};
944
945static 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 */
955struct 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 */
966static inline ext3_fsblk_t
967ext3_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 */
991extern int ext3_bg_has_super(struct super_block *sb, int group);
992extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
993extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
994 ext3_fsblk_t goal, int *errp);
995extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
996 ext3_fsblk_t goal, unsigned long *count, int *errp);
997extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
998 ext3_fsblk_t block, unsigned long count);
999extern 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);
1002extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
1003extern void ext3_check_blocks_bitmap (struct super_block *);
1004extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
1005 unsigned int block_group,
1006 struct buffer_head ** bh);
1007extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
1008extern void ext3_init_block_alloc_info(struct inode *);
1009extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
1010extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range);
1011
1012/* dir.c */
1013extern int ext3_check_dir_entry(const char *, struct inode *,
1014 struct ext3_dir_entry_2 *,
1015 struct buffer_head *, unsigned long);
1016extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
1017 __u32 minor_hash,
1018 struct ext3_dir_entry_2 *dirent);
1019extern void ext3_htree_free_dir_info(struct dir_private_info *p);
1020
1021/* fsync.c */
1022extern int ext3_sync_file(struct file *, loff_t, loff_t, int);
1023
1024/* hash.c */
1025extern int ext3fs_dirhash(const char *name, int len, struct
1026 dx_hash_info *hinfo);
1027
1028/* ialloc.c */
1029extern struct inode * ext3_new_inode (handle_t *, struct inode *,
1030 const struct qstr *, umode_t);
1031extern void ext3_free_inode (handle_t *, struct inode *);
1032extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
1033extern unsigned long ext3_count_free_inodes (struct super_block *);
1034extern unsigned long ext3_count_dirs (struct super_block *);
1035extern void ext3_check_inodes_bitmap (struct super_block *);
1036extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
1037
1038
1039/* inode.c */
1040int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
1041 struct buffer_head *bh, ext3_fsblk_t blocknr);
1042struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
1043struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
1044int 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
1048extern struct inode *ext3_iget(struct super_block *, unsigned long);
1049extern int ext3_write_inode (struct inode *, struct writeback_control *);
1050extern int ext3_setattr (struct dentry *, struct iattr *);
1051extern void ext3_evict_inode (struct inode *);
1052extern int ext3_sync_inode (handle_t *, struct inode *);
1053extern void ext3_discard_reservation (struct inode *);
1054extern void ext3_dirty_inode(struct inode *, int);
1055extern int ext3_change_inode_journal_flag(struct inode *, int);
1056extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
1057extern int ext3_can_truncate(struct inode *inode);
1058extern void ext3_truncate(struct inode *inode);
1059extern void ext3_set_inode_flags(struct inode *);
1060extern void ext3_get_inode_flags(struct ext3_inode_info *);
1061extern void ext3_set_aops(struct inode *inode);
1062extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1063 u64 start, u64 len);
1064
1065/* ioctl.c */
1066extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
1067extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
1068
1069/* namei.c */
1070extern int ext3_orphan_add(handle_t *, struct inode *);
1071extern int ext3_orphan_del(handle_t *, struct inode *);
1072extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1073 __u32 start_minor_hash, __u32 *next_hash);
1074
1075/* resize.c */
1076extern int ext3_group_add(struct super_block *sb,
1077 struct ext3_new_group_data *input);
1078extern 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 */
1083extern __printf(3, 4)
1084void ext3_error(struct super_block *, const char *, const char *, ...);
1085extern void __ext3_std_error (struct super_block *, const char *, int);
1086extern __printf(3, 4)
1087void ext3_abort(struct super_block *, const char *, const char *, ...);
1088extern __printf(3, 4)
1089void ext3_warning(struct super_block *, const char *, const char *, ...);
1090extern __printf(3, 4)
1091void ext3_msg(struct super_block *, const char *, const char *, ...);
1092extern void ext3_update_dynamic_rev (struct super_block *sb);
1093
1094#define ext3_std_error(sb, errno) \
1095do { \
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 */
1105extern const struct file_operations ext3_dir_operations;
1106
1107/* file.c */
1108extern const struct inode_operations ext3_file_inode_operations;
1109extern const struct file_operations ext3_file_operations;
1110
1111/* namei.c */
1112extern const struct inode_operations ext3_dir_inode_operations;
1113extern const struct inode_operations ext3_special_inode_operations;
1114
1115/* symlink.c */
1116extern const struct inode_operations ext3_symlink_inode_operations;
1117extern 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
1190int
1191ext3_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
1200int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
1201 struct ext3_iloc *iloc);
1202
1203int 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
1212static inline void ext3_journal_release_buffer(handle_t *handle,
1213 struct buffer_head *bh)
1214{
1215 journal_release_buffer(handle, bh);
1216}
1217
1218void ext3_journal_abort_handle(const char *caller, const char *err_fn,
1219 struct buffer_head *bh, handle_t *handle, int err);
1220
1221int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
1222 struct buffer_head *bh);
1223
1224int __ext3_journal_get_write_access(const char *where, handle_t *handle,
1225 struct buffer_head *bh);
1226
1227int __ext3_journal_forget(const char *where, handle_t *handle,
1228 struct buffer_head *bh);
1229
1230int __ext3_journal_revoke(const char *where, handle_t *handle,
1231 unsigned long blocknr, struct buffer_head *bh);
1232
1233int __ext3_journal_get_create_access(const char *where,
1234 handle_t *handle, struct buffer_head *bh);
1235
1236int __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
1252int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
1253
1254handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
1255int __ext3_journal_stop(const char *where, handle_t *handle);
1256
1257static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
1258{
1259 return ext3_journal_start_sb(inode->i_sb, nblocks);
1260}
1261
1262#define ext3_journal_stop(handle) \
1263 __ext3_journal_stop(__func__, (handle))
1264
1265static inline handle_t *ext3_journal_current_handle(void)
1266{
1267 return journal_current_handle();
1268}
1269
1270static inline int ext3_journal_extend(handle_t *handle, int nblocks)
1271{
1272 return journal_extend(handle, nblocks);
1273}
1274
1275static inline int ext3_journal_restart(handle_t *handle, int nblocks)
1276{
1277 return journal_restart(handle, nblocks);
1278}
1279
1280static inline int ext3_journal_blocks_per_page(struct inode *inode)
1281{
1282 return journal_blocks_per_page(inode);
1283}
1284
1285static inline int ext3_journal_force_commit(journal_t *journal)
1286{
1287 return journal_force_commit(journal);
1288}
1289
1290/* super.c */
1291int ext3_force_commit(struct super_block *sb);
1292
1293static 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
1304static 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
1315static 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>