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Merge tag 'master-2014-11-11' of git://git.kernel.org/pub/scm/linux/kernel/git/linvil...
[deliverable/linux.git] / fs / ext3 / ext3.h
CommitLineData
1da177e4 1/*
4613ad18
AV		 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.
1da177e4
LT		 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
4613ad18
AV		 22#include <linux/fs.h>
23#include <linux/jbd.h>
e18fa700 24#include <linux/magic.h>
187f1882 25#include <linux/bug.h>
4613ad18 26#include <linux/blockgroup_lock.h>
1da177e4
LT		 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
b54e41ec
MC		 41/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
42#define EXT3_MAX_RESERVE_BLOCKS 1027
1da177e4 43#define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
1da177e4
LT		 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:", \
d5c003b4 52 __FILE__, __LINE__, __func__); \
1da177e4
LT		 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
1da177e4
LT		 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
0f0a89eb
TS		 81#define EXT3_MAX_BLOCK_SIZE 65536
82#define EXT3_MIN_BLOCK_LOG_SIZE 10
4613ad18 83#define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize)
1da177e4 84#define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
4613ad18 85#define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
1da177e4
LT		 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)
1da177e4
LT		 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
4613ad18
AV		 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)
1da177e4
LT		 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 */
4613ad18
AV		 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)
1da177e4
LT		 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
2e8671cb
DG		 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 |\
1cd9f097
TT		 161 EXT3_SYNC_FL | EXT3_NODUMP_FL |\
162 EXT3_NOATIME_FL | EXT3_COMPRBLK_FL |\
2e8671cb
DG		 163 EXT3_NOCOMPR_FL | EXT3_JOURNAL_DATA_FL |\
164 EXT3_NOTAIL_FL | EXT3_DIRSYNC_FL)
165
04143e2f
DG		 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
1da177e4
LT		 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 */
36695673
DH		 210#define EXT3_IOC_GETFLAGS FS_IOC_GETFLAGS
211#define EXT3_IOC_SETFLAGS FS_IOC_SETFLAGS
1da177e4
LT		 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)
36695673
DH		 216#define EXT3_IOC_GETVERSION_OLD FS_IOC_GETVERSION
217#define EXT3_IOC_SETVERSION_OLD FS_IOC_SETVERSION
1da177e4
LT		 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
36695673
DH		 224/*
225 * ioctl commands in 32 bit emulation
226 */
52a700c5
DH		 227#define EXT3_IOC32_GETFLAGS FS_IOC32_GETFLAGS
228#define EXT3_IOC32_SETFLAGS FS_IOC32_SETFLAGS
36695673
DH		 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
52a700c5
DH		 237#define EXT3_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
238#define EXT3_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
239
a93114e4
JK		 240/* Number of supported quota types */
241#define EXT3_MAXQUOTAS 2
36695673 242
08c6a96f
JK		 243/*
244 * Mount options
245 */
246struct ext3_mount_options {
247 unsigned long s_mount_opt;
1523299d
EB		 248 kuid_t s_resuid;
249 kgid_t s_resgid;
08c6a96f
JK		 250 unsigned long s_commit_interval;
251#ifdef CONFIG_QUOTA
252 int s_jquota_fmt;
a93114e4 253 char *s_qf_names[EXT3_MAXQUOTAS];
08c6a96f
JK		 254#endif
255};
256
1da177e4
LT		 257/*
258 * Structure of an inode on the disk
259 */
260struct ext3_inode {
261 __le16 i_mode; /* File mode */
262 __le16 i_uid; /* Low 16 bits of Owner Uid */
263 __le32 i_size; /* Size in bytes */
264 __le32 i_atime; /* Access time */
265 __le32 i_ctime; /* Creation time */
266 __le32 i_mtime; /* Modification time */
267 __le32 i_dtime; /* Deletion Time */
268 __le16 i_gid; /* Low 16 bits of Group Id */
269 __le16 i_links_count; /* Links count */
270 __le32 i_blocks; /* Blocks count */
271 __le32 i_flags; /* File flags */
272 union {
273 struct {
274 __u32 l_i_reserved1;
275 } linux1;
276 struct {
277 __u32 h_i_translator;
278 } hurd1;
279 struct {
280 __u32 m_i_reserved1;
281 } masix1;
282 } osd1; /* OS dependent 1 */
283 __le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
284 __le32 i_generation; /* File version (for NFS) */
285 __le32 i_file_acl; /* File ACL */
286 __le32 i_dir_acl; /* Directory ACL */
287 __le32 i_faddr; /* Fragment address */
288 union {
289 struct {
290 __u8 l_i_frag; /* Fragment number */
291 __u8 l_i_fsize; /* Fragment size */
292 __u16 i_pad1;
293 __le16 l_i_uid_high; /* these 2 fields */
294 __le16 l_i_gid_high; /* were reserved2[0] */
295 __u32 l_i_reserved2;
296 } linux2;
297 struct {
298 __u8 h_i_frag; /* Fragment number */
299 __u8 h_i_fsize; /* Fragment size */
300 __u16 h_i_mode_high;
301 __u16 h_i_uid_high;
302 __u16 h_i_gid_high;
303 __u32 h_i_author;
304 } hurd2;
305 struct {
306 __u8 m_i_frag; /* Fragment number */
307 __u8 m_i_fsize; /* Fragment size */
308 __u16 m_pad1;
309 __u32 m_i_reserved2[2];
310 } masix2;
311 } osd2; /* OS dependent 2 */
312 __le16 i_extra_isize;
313 __le16 i_pad1;
314};
315
316#define i_size_high i_dir_acl
317
1da177e4
LT		 318#define i_reserved1 osd1.linux1.l_i_reserved1
319#define i_frag osd2.linux2.l_i_frag
320#define i_fsize osd2.linux2.l_i_fsize
321#define i_uid_low i_uid
322#define i_gid_low i_gid
323#define i_uid_high osd2.linux2.l_i_uid_high
324#define i_gid_high osd2.linux2.l_i_gid_high
325#define i_reserved2 osd2.linux2.l_i_reserved2
326
1da177e4
LT		 327/*
328 * File system states
329 */
330#define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
331#define EXT3_ERROR_FS 0x0002 /* Errors detected */
332#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
333
5e1f8c9e
TT		 334/*
335 * Misc. filesystem flags
336 */
337#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
338#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
339#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
340
1da177e4
LT		 341/*
342 * Mount flags
343 */
344#define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */
fbc85402 345/* EXT3_MOUNT_OLDALLOC was there */
1da177e4
LT		 346#define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */
347#define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */
348#define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
349#define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
350#define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
351#define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
352#define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
353#define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */
354#define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
355#define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
356#define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
357#define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
358#define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
359#define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
360#define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
361#define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
362#define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
363#define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */
1f54587b 364#define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */
8fc2751b
MB		 365#define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
366#define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
0e4fb5e2
HK		 367#define EXT3_MOUNT_DATA_ERR_ABORT 0x400000 /* Abort on file data write
368 * error in ordered mode */
1da177e4
LT		 369
370/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
371#ifndef _LINUX_EXT2_FS_H
372#define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
373#define set_opt(o, opt) o |= EXT3_MOUNT_##opt
374#define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
375 EXT3_MOUNT_##opt)
376#else
377#define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
378#define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
379#define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
380#endif
381
90085930 382#define ext3_set_bit __set_bit_le
1da177e4 383#define ext3_set_bit_atomic ext2_set_bit_atomic
90085930 384#define ext3_clear_bit __clear_bit_le
1da177e4 385#define ext3_clear_bit_atomic ext2_clear_bit_atomic
0795ccea 386#define ext3_test_bit test_bit_le
0795ccea 387#define ext3_find_next_zero_bit find_next_zero_bit_le
1da177e4
LT		 388
389/*
390 * Maximal mount counts between two filesystem checks
391 */
392#define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
393#define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
394
395/*
396 * Behaviour when detecting errors
397 */
398#define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
399#define EXT3_ERRORS_RO 2 /* Remount fs read-only */
400#define EXT3_ERRORS_PANIC 3 /* Panic */
401#define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
402
403/*
404 * Structure of the super block
405 */
406struct ext3_super_block {
407/*00*/ __le32 s_inodes_count; /* Inodes count */
408 __le32 s_blocks_count; /* Blocks count */
409 __le32 s_r_blocks_count; /* Reserved blocks count */
410 __le32 s_free_blocks_count; /* Free blocks count */
411/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
412 __le32 s_first_data_block; /* First Data Block */
413 __le32 s_log_block_size; /* Block size */
414 __le32 s_log_frag_size; /* Fragment size */
415/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
416 __le32 s_frags_per_group; /* # Fragments per group */
417 __le32 s_inodes_per_group; /* # Inodes per group */
418 __le32 s_mtime; /* Mount time */
419/*30*/ __le32 s_wtime; /* Write time */
420 __le16 s_mnt_count; /* Mount count */
421 __le16 s_max_mnt_count; /* Maximal mount count */
422 __le16 s_magic; /* Magic signature */
423 __le16 s_state; /* File system state */
424 __le16 s_errors; /* Behaviour when detecting errors */
425 __le16 s_minor_rev_level; /* minor revision level */
426/*40*/ __le32 s_lastcheck; /* time of last check */
427 __le32 s_checkinterval; /* max. time between checks */
428 __le32 s_creator_os; /* OS */
429 __le32 s_rev_level; /* Revision level */
430/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
431 __le16 s_def_resgid; /* Default gid for reserved blocks */
432 /*
433 * These fields are for EXT3_DYNAMIC_REV superblocks only.
434 *
435 * Note: the difference between the compatible feature set and
436 * the incompatible feature set is that if there is a bit set
437 * in the incompatible feature set that the kernel doesn't
438 * know about, it should refuse to mount the filesystem.
439 *
440 * e2fsck's requirements are more strict; if it doesn't know
441 * about a feature in either the compatible or incompatible
442 * feature set, it must abort and not try to meddle with
443 * things it doesn't understand...
444 */
445 __le32 s_first_ino; /* First non-reserved inode */
446 __le16 s_inode_size; /* size of inode structure */
447 __le16 s_block_group_nr; /* block group # of this superblock */
448 __le32 s_feature_compat; /* compatible feature set */
449/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
450 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
451/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
452/*78*/ char s_volume_name[16]; /* volume name */
453/*88*/ char s_last_mounted[64]; /* directory where last mounted */
454/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
455 /*
456 * Performance hints. Directory preallocation should only
457 * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
458 */
459 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
460 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
a4e4de36 461 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1da177e4
LT		 462 /*
463 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
464 */
465/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
466/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
467 __le32 s_journal_dev; /* device number of journal file */
468 __le32 s_last_orphan; /* start of list of inodes to delete */
469 __le32 s_hash_seed[4]; /* HTREE hash seed */
470 __u8 s_def_hash_version; /* Default hash version to use */
471 __u8 s_reserved_char_pad;
472 __u16 s_reserved_word_pad;
473 __le32 s_default_mount_opts;
e9ad5620 474 __le32 s_first_meta_bg; /* First metablock block group */
5e1f8c9e
TT		 475 __le32 s_mkfs_time; /* When the filesystem was created */
476 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
477 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
478/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
479 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
480 __le32 s_free_blocks_count_hi; /* Free blocks count */
481 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
482 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
483 __le32 s_flags; /* Miscellaneous flags */
484 __le16 s_raid_stride; /* RAID stride */
485 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
486 __le64 s_mmp_block; /* Block for multi-mount protection */
487 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
488 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
489 __u8 s_reserved_char_pad2;
490 __le16 s_reserved_pad;
491 __u32 s_reserved[162]; /* Padding to the end of the block */
1da177e4
LT		 492};
493
4613ad18
AV		 494/* data type for block offset of block group */
495typedef int ext3_grpblk_t;
496
497/* data type for filesystem-wide blocks number */
498typedef unsigned long ext3_fsblk_t;
499
500#define E3FSBLK "%lu"
501
502struct ext3_reserve_window {
503 ext3_fsblk_t _rsv_start; /* First byte reserved */
504 ext3_fsblk_t _rsv_end; /* Last byte reserved or 0 */
505};
506
507struct ext3_reserve_window_node {
508 struct rb_node rsv_node;
509 __u32 rsv_goal_size;
510 __u32 rsv_alloc_hit;
511 struct ext3_reserve_window rsv_window;
512};
513
514struct ext3_block_alloc_info {
515 /* information about reservation window */
516 struct ext3_reserve_window_node rsv_window_node;
517 /*
518 * was i_next_alloc_block in ext3_inode_info
519 * is the logical (file-relative) number of the
520 * most-recently-allocated block in this file.
521 * We use this for detecting linearly ascending allocation requests.
522 */
523 __u32 last_alloc_logical_block;
524 /*
525 * Was i_next_alloc_goal in ext3_inode_info
526 * is the *physical* companion to i_next_alloc_block.
527 * it the physical block number of the block which was most-recentl
528 * allocated to this file. This give us the goal (target) for the next
529 * allocation when we detect linearly ascending requests.
530 */
531 ext3_fsblk_t last_alloc_physical_block;
532};
533
534#define rsv_start rsv_window._rsv_start
535#define rsv_end rsv_window._rsv_end
536
537/*
538 * third extended file system inode data in memory
539 */
540struct ext3_inode_info {
541 __le32 i_data[15]; /* unconverted */
542 __u32 i_flags;
543#ifdef EXT3_FRAGMENTS
544 __u32 i_faddr;
545 __u8 i_frag_no;
546 __u8 i_frag_size;
547#endif
548 ext3_fsblk_t i_file_acl;
549 __u32 i_dir_acl;
550 __u32 i_dtime;
551
552 /*
553 * i_block_group is the number of the block group which contains
554 * this file's inode. Constant across the lifetime of the inode,
555 * it is ued for making block allocation decisions - we try to
556 * place a file's data blocks near its inode block, and new inodes
557 * near to their parent directory's inode.
558 */
559 __u32 i_block_group;
560 unsigned long i_state_flags; /* Dynamic state flags for ext3 */
561
562 /* block reservation info */
563 struct ext3_block_alloc_info *i_block_alloc_info;
564
565 __u32 i_dir_start_lookup;
566#ifdef CONFIG_EXT3_FS_XATTR
567 /*
568 * Extended attributes can be read independently of the main file
569 * data. Taking i_mutex even when reading would cause contention
570 * between readers of EAs and writers of regular file data, so
571 * instead we synchronize on xattr_sem when reading or changing
572 * EAs.
573 */
574 struct rw_semaphore xattr_sem;
575#endif
576
577 struct list_head i_orphan; /* unlinked but open inodes */
578
579 /*
580 * i_disksize keeps track of what the inode size is ON DISK, not
581 * in memory. During truncate, i_size is set to the new size by
582 * the VFS prior to calling ext3_truncate(), but the filesystem won't
583 * set i_disksize to 0 until the truncate is actually under way.
584 *
585 * The intent is that i_disksize always represents the blocks which
586 * are used by this file. This allows recovery to restart truncate
587 * on orphans if we crash during truncate. We actually write i_disksize
588 * into the on-disk inode when writing inodes out, instead of i_size.
589 *
590 * The only time when i_disksize and i_size may be different is when
591 * a truncate is in progress. The only things which change i_disksize
592 * are ext3_get_block (growth) and ext3_truncate (shrinkth).
593 */
594 loff_t i_disksize;
595
596 /* on-disk additional length */
597 __u16 i_extra_isize;
598
599 /*
600 * truncate_mutex is for serialising ext3_truncate() against
601 * ext3_getblock(). In the 2.4 ext2 design, great chunks of inode's
602 * data tree are chopped off during truncate. We can't do that in
603 * ext3 because whenever we perform intermediate commits during
604 * truncate, the inode and all the metadata blocks *must* be in a
605 * consistent state which allows truncation of the orphans to restart
606 * during recovery. Hence we must fix the get_block-vs-truncate race
607 * by other means, so we have truncate_mutex.
608 */
609 struct mutex truncate_mutex;
610
611 /*
612 * Transactions that contain inode's metadata needed to complete
613 * fsync and fdatasync, respectively.
614 */
615 atomic_t i_sync_tid;
616 atomic_t i_datasync_tid;
617
618 struct inode vfs_inode;
619};
620
621/*
622 * third extended-fs super-block data in memory
623 */
624struct ext3_sb_info {
625 unsigned long s_frag_size; /* Size of a fragment in bytes */
626 unsigned long s_frags_per_block;/* Number of fragments per block */
627 unsigned long s_inodes_per_block;/* Number of inodes per block */
628 unsigned long s_frags_per_group;/* Number of fragments in a group */
629 unsigned long s_blocks_per_group;/* Number of blocks in a group */
630 unsigned long s_inodes_per_group;/* Number of inodes in a group */
631 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
632 unsigned long s_gdb_count; /* Number of group descriptor blocks */
633 unsigned long s_desc_per_block; /* Number of group descriptors per block */
634 unsigned long s_groups_count; /* Number of groups in the fs */
635 unsigned long s_overhead_last; /* Last calculated overhead */
636 unsigned long s_blocks_last; /* Last seen block count */
637 struct buffer_head * s_sbh; /* Buffer containing the super block */
638 struct ext3_super_block * s_es; /* Pointer to the super block in the buffer */
639 struct buffer_head ** s_group_desc;
640 unsigned long s_mount_opt;
641 ext3_fsblk_t s_sb_block;
1523299d
EB		 642 kuid_t s_resuid;
643 kgid_t s_resgid;
4613ad18
AV		 644 unsigned short s_mount_state;
645 unsigned short s_pad;
646 int s_addr_per_block_bits;
647 int s_desc_per_block_bits;
648 int s_inode_size;
649 int s_first_ino;
650 spinlock_t s_next_gen_lock;
651 u32 s_next_generation;
652 u32 s_hash_seed[4];
653 int s_def_hash_version;
654 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
655 struct percpu_counter s_freeblocks_counter;
656 struct percpu_counter s_freeinodes_counter;
657 struct percpu_counter s_dirs_counter;
658 struct blockgroup_lock *s_blockgroup_lock;
659
660 /* root of the per fs reservation window tree */
661 spinlock_t s_rsv_window_lock;
662 struct rb_root s_rsv_window_root;
663 struct ext3_reserve_window_node s_rsv_window_head;
664
665 /* Journaling */
666 struct inode * s_journal_inode;
667 struct journal_s * s_journal;
668 struct list_head s_orphan;
669 struct mutex s_orphan_lock;
670 struct mutex s_resize_lock;
671 unsigned long s_commit_interval;
672 struct block_device *journal_bdev;
673#ifdef CONFIG_QUOTA
a93114e4 674 char *s_qf_names[EXT3_MAXQUOTAS]; /* Names of quota files with journalled quota */
4613ad18
AV		 675 int s_jquota_fmt; /* Format of quota to use */
676#endif
677};
678
679static inline spinlock_t *
680sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group)
681{
682 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
683}
684
1da177e4
LT		 685static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
686{
687 return sb->s_fs_info;
688}
689static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
690{
691 return container_of(inode, struct ext3_inode_info, vfs_inode);
692}
2ccb48eb
NB		 693
694static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
695{
696 return ino == EXT3_ROOT_INO ||
697 ino == EXT3_JOURNAL_INO ||
698 ino == EXT3_RESIZE_INO ||
699 (ino >= EXT3_FIRST_INO(sb) &&
700 ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
701}
9df93939
JK		 702
703/*
704 * Inode dynamic state flags
705 */
706enum {
707 EXT3_STATE_JDATA, /* journaled data exists */
708 EXT3_STATE_NEW, /* inode is newly created */
709 EXT3_STATE_XATTR, /* has in-inode xattrs */
710 EXT3_STATE_FLUSH_ON_CLOSE, /* flush dirty pages on close */
711};
712
713static inline int ext3_test_inode_state(struct inode *inode, int bit)
714{
de329820 715 return test_bit(bit, &EXT3_I(inode)->i_state_flags);
9df93939
JK		 716}
717
718static inline void ext3_set_inode_state(struct inode *inode, int bit)
719{
de329820 720 set_bit(bit, &EXT3_I(inode)->i_state_flags);
9df93939
JK		 721}
722
723static inline void ext3_clear_inode_state(struct inode *inode, int bit)
724{
de329820 725 clear_bit(bit, &EXT3_I(inode)->i_state_flags);
9df93939 726}
1da177e4
LT		 727
728#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
729
730/*
731 * Codes for operating systems
732 */
733#define EXT3_OS_LINUX 0
734#define EXT3_OS_HURD 1
735#define EXT3_OS_MASIX 2
736#define EXT3_OS_FREEBSD 3
737#define EXT3_OS_LITES 4
738
739/*
740 * Revision levels
741 */
742#define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
743#define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
744
745#define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
746#define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
747
748#define EXT3_GOOD_OLD_INODE_SIZE 128
749
750/*
751 * Feature set definitions
752 */
753
754#define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
755 ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
756#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
757 ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
758#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
759 ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
760#define EXT3_SET_COMPAT_FEATURE(sb,mask) \
761 EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
762#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
763 EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
764#define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
765 EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
766#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
767 EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
768#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
769 EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
770#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
771 EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
772
773#define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
774#define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
775#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
776#define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
777#define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
778#define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
779
780#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
781#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
782#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
783
784#define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
785#define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
786#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
787#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
788#define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
789
790#define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
791#define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \
792 EXT3_FEATURE_INCOMPAT_RECOVER| \
793 EXT3_FEATURE_INCOMPAT_META_BG)
794#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
795 EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
796 EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
797
798/*
799 * Default values for user and/or group using reserved blocks
800 */
801#define EXT3_DEF_RESUID 0
802#define EXT3_DEF_RESGID 0
803
804/*
805 * Default mount options
806 */
807#define EXT3_DEFM_DEBUG 0x0001
808#define EXT3_DEFM_BSDGROUPS 0x0002
809#define EXT3_DEFM_XATTR_USER 0x0004
810#define EXT3_DEFM_ACL 0x0008
811#define EXT3_DEFM_UID16 0x0010
812#define EXT3_DEFM_JMODE 0x0060
813#define EXT3_DEFM_JMODE_DATA 0x0020
814#define EXT3_DEFM_JMODE_ORDERED 0x0040
815#define EXT3_DEFM_JMODE_WBACK 0x0060
816
817/*
818 * Structure of a directory entry
819 */
820#define EXT3_NAME_LEN 255
821
822struct ext3_dir_entry {
823 __le32 inode; /* Inode number */
824 __le16 rec_len; /* Directory entry length */
825 __le16 name_len; /* Name length */
826 char name[EXT3_NAME_LEN]; /* File name */
827};
828
829/*
830 * The new version of the directory entry. Since EXT3 structures are
831 * stored in intel byte order, and the name_len field could never be
832 * bigger than 255 chars, it's safe to reclaim the extra byte for the
833 * file_type field.
834 */
835struct ext3_dir_entry_2 {
836 __le32 inode; /* Inode number */
837 __le16 rec_len; /* Directory entry length */
838 __u8 name_len; /* Name length */
839 __u8 file_type;
840 char name[EXT3_NAME_LEN]; /* File name */
841};
842
843/*
844 * Ext3 directory file types. Only the low 3 bits are used. The
845 * other bits are reserved for now.
846 */
847#define EXT3_FT_UNKNOWN 0
848#define EXT3_FT_REG_FILE 1
849#define EXT3_FT_DIR 2
850#define EXT3_FT_CHRDEV 3
851#define EXT3_FT_BLKDEV 4
852#define EXT3_FT_FIFO 5
853#define EXT3_FT_SOCK 6
854#define EXT3_FT_SYMLINK 7
855
856#define EXT3_FT_MAX 8
857
858/*
859 * EXT3_DIR_PAD defines the directory entries boundaries
860 *
861 * NOTE: It must be a multiple of 4
862 */
863#define EXT3_DIR_PAD 4
864#define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
865#define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
866 ~EXT3_DIR_ROUND)
7c06a8dc
JK		 867#define EXT3_MAX_REC_LEN ((1<<16)-1)
868
a4ae3094
ES		 869/*
870 * Tests against MAX_REC_LEN etc were put in place for 64k block
871 * sizes; if that is not possible on this arch, we can skip
872 * those tests and speed things up.
873 */
7c06a8dc
JK		 874static inline unsigned ext3_rec_len_from_disk(__le16 dlen)
875{
876 unsigned len = le16_to_cpu(dlen);
877
a4ae3094 878#if (PAGE_CACHE_SIZE >= 65536)
7c06a8dc
JK		 879 if (len == EXT3_MAX_REC_LEN)
880 return 1 << 16;
a4ae3094 881#endif
7c06a8dc
JK		 882 return len;
883}
884
885static inline __le16 ext3_rec_len_to_disk(unsigned len)
886{
a4ae3094 887#if (PAGE_CACHE_SIZE >= 65536)
7c06a8dc
JK		 888 if (len == (1 << 16))
889 return cpu_to_le16(EXT3_MAX_REC_LEN);
890 else if (len > (1 << 16))
891 BUG();
a4ae3094 892#endif
7c06a8dc
JK		 893 return cpu_to_le16(len);
894}
895
1da177e4
LT		 896/*
897 * Hash Tree Directory indexing
898 * (c) Daniel Phillips, 2001
899 */
900
059590f4
ES		 901#define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
902 EXT3_FEATURE_COMPAT_DIR_INDEX) && \
1da177e4
LT		 903 (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
904#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
905#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1da177e4
LT		 906
907/* Legal values for the dx_root hash_version field: */
908
909#define DX_HASH_LEGACY 0
910#define DX_HASH_HALF_MD4 1
911#define DX_HASH_TEA 2
5e1f8c9e
TT		 912#define DX_HASH_LEGACY_UNSIGNED 3
913#define DX_HASH_HALF_MD4_UNSIGNED 4
914#define DX_HASH_TEA_UNSIGNED 5
1da177e4
LT		 915
916/* hash info structure used by the directory hash */
917struct dx_hash_info
918{
919 u32 hash;
920 u32 minor_hash;
921 int hash_version;
922 u32 *seed;
923};
924
d7dab39b
ES		 925
926/* 32 and 64 bit signed EOF for dx directories */
927#define EXT3_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
928#define EXT3_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
929
1da177e4 930
1da177e4
LT		 931/*
932 * Control parameters used by ext3_htree_next_block
933 */
934#define HASH_NB_ALWAYS 1
935
936
937/*
938 * Describe an inode's exact location on disk and in memory
939 */
940struct ext3_iloc
941{
942 struct buffer_head *bh;
943 unsigned long offset;
944 unsigned long block_group;
945};
946
947static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
948{
949 return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
950}
951
952/*
953 * This structure is stuffed into the struct file's private_data field
954 * for directories. It is where we put information so that we can do
955 * readdir operations in hash tree order.
956 */
957struct dir_private_info {
958 struct rb_root root;
959 struct rb_node *curr_node;
960 struct fname *extra_fname;
961 loff_t last_pos;
962 __u32 curr_hash;
963 __u32 curr_minor_hash;
964 __u32 next_hash;
965};
966
43d23f90
MC		 967/* calculate the first block number of the group */
968static inline ext3_fsblk_t
969ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
970{
971 return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
972 le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
973}
974
1da177e4
LT		 975/*
976 * Special error return code only used by dx_probe() and its callers.
977 */
978#define ERR_BAD_DX_DIR -75000
979
980/*
981 * Function prototypes
982 */
983
984/*
985 * Ok, these declarations are also in <linux/kernel.h> but none of the
986 * ext3 source programs needs to include it so they are duplicated here.
987 */
988# define NORET_TYPE /**/
989# define ATTRIB_NORET __attribute__((noreturn))
990# define NORET_AND noreturn,
991
992/* balloc.c */
993extern int ext3_bg_has_super(struct super_block *sb, int group);
994extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
1c2bf374
MC		 995extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
996 ext3_fsblk_t goal, int *errp);
997extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
998 ext3_fsblk_t goal, unsigned long *count, int *errp);
999extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
1000 ext3_fsblk_t block, unsigned long count);
1001extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
1002 ext3_fsblk_t block, unsigned long count,
1003 unsigned long *pdquot_freed_blocks);
43d23f90 1004extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
1da177e4
LT		 1005extern void ext3_check_blocks_bitmap (struct super_block *);
1006extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
1007 unsigned int block_group,
1008 struct buffer_head ** bh);
1009extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
1010extern void ext3_init_block_alloc_info(struct inode *);
1011extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
b853b96b 1012extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range);
1da177e4
LT		 1013
1014/* dir.c */
1015extern int ext3_check_dir_entry(const char *, struct inode *,
1016 struct ext3_dir_entry_2 *,
1017 struct buffer_head *, unsigned long);
1018extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
1019 __u32 minor_hash,
1020 struct ext3_dir_entry_2 *dirent);
1021extern void ext3_htree_free_dir_info(struct dir_private_info *p);
1022
1023/* fsync.c */
02c24a82 1024extern int ext3_sync_file(struct file *, loff_t, loff_t, int);
1da177e4
LT		 1025
1026/* hash.c */
1027extern int ext3fs_dirhash(const char *name, int len, struct
1028 dx_hash_info *hinfo);
1029
1030/* ialloc.c */
2a7dba39 1031extern struct inode * ext3_new_inode (handle_t *, struct inode *,
69b34f3a 1032 const struct qstr *, umode_t);
1da177e4
LT		 1033extern void ext3_free_inode (handle_t *, struct inode *);
1034extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
1035extern unsigned long ext3_count_free_inodes (struct super_block *);
1036extern unsigned long ext3_count_dirs (struct super_block *);
1037extern void ext3_check_inodes_bitmap (struct super_block *);
1038extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
1039
1040
1041/* inode.c */
1c2bf374
MC		 1042int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
1043 struct buffer_head *bh, ext3_fsblk_t blocknr);
d8733c29
AM		 1044struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
1045struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
89747d36
MC		 1046int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
1047 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
43237b54 1048 int create);
1da177e4 1049
473043dc 1050extern struct inode *ext3_iget(struct super_block *, unsigned long);
a9185b41 1051extern int ext3_write_inode (struct inode *, struct writeback_control *);
1da177e4 1052extern int ext3_setattr (struct dentry *, struct iattr *);
ac14a95b 1053extern void ext3_evict_inode (struct inode *);
1da177e4
LT		 1054extern int ext3_sync_inode (handle_t *, struct inode *);
1055extern void ext3_discard_reservation (struct inode *);
aa385729 1056extern void ext3_dirty_inode(struct inode *, int);
1da177e4
LT		 1057extern int ext3_change_inode_journal_flag(struct inode *, int);
1058extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
ae76dd9a 1059extern int ext3_can_truncate(struct inode *inode);
40680f2f 1060extern void ext3_truncate(struct inode *inode);
1da177e4 1061extern void ext3_set_inode_flags(struct inode *);
28be5abb 1062extern void ext3_get_inode_flags(struct ext3_inode_info *);
1da177e4 1063extern void ext3_set_aops(struct inode *inode);
68c9d702
JB		 1064extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1065 u64 start, u64 len);
1da177e4
LT		 1066
1067/* ioctl.c */
039fd8ce
CM		 1068extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
1069extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
1da177e4
LT		 1070
1071/* namei.c */
1072extern int ext3_orphan_add(handle_t *, struct inode *);
1073extern int ext3_orphan_del(handle_t *, struct inode *);
1074extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1075 __u32 start_minor_hash, __u32 *next_hash);
1076
1077/* resize.c */
1078extern int ext3_group_add(struct super_block *sb,
1079 struct ext3_new_group_data *input);
1080extern int ext3_group_extend(struct super_block *sb,
1081 struct ext3_super_block *es,
43d23f90 1082 ext3_fsblk_t n_blocks_count);
1da177e4
LT		 1083
1084/* super.c */
b9075fa9
JP		 1085extern __printf(3, 4)
1086void ext3_error(struct super_block *, const char *, const char *, ...);
1da177e4 1087extern void __ext3_std_error (struct super_block *, const char *, int);
b9075fa9
JP		 1088extern __printf(3, 4)
1089void ext3_abort(struct super_block *, const char *, const char *, ...);
1090extern __printf(3, 4)
1091void ext3_warning(struct super_block *, const char *, const char *, ...);
1092extern __printf(3, 4)
1093void ext3_msg(struct super_block *, const char *, const char *, ...);
1da177e4
LT		 1094extern void ext3_update_dynamic_rev (struct super_block *sb);
1095
1096#define ext3_std_error(sb, errno) \
1097do { \
1098 if ((errno)) \
d5c003b4 1099 __ext3_std_error((sb), __func__, (errno)); \
1da177e4
LT		 1100} while (0)
1101
1102/*
1103 * Inodes and files operations
1104 */
1105
1106/* dir.c */
4b6f5d20 1107extern const struct file_operations ext3_dir_operations;
1da177e4
LT		 1108
1109/* file.c */
c5ef1c42 1110extern const struct inode_operations ext3_file_inode_operations;
4b6f5d20 1111extern const struct file_operations ext3_file_operations;
1da177e4
LT		 1112
1113/* namei.c */
c5ef1c42
AV		 1114extern const struct inode_operations ext3_dir_inode_operations;
1115extern const struct inode_operations ext3_special_inode_operations;
1da177e4
LT		 1116
1117/* symlink.c */
c5ef1c42
AV		 1118extern const struct inode_operations ext3_symlink_inode_operations;
1119extern const struct inode_operations ext3_fast_symlink_inode_operations;
1da177e4 1120
4613ad18
AV		 1121#define EXT3_JOURNAL(inode) (EXT3_SB((inode)->i_sb)->s_journal)
1122
1123/* Define the number of blocks we need to account to a transaction to
1124 * modify one block of data.
1125 *
1126 * We may have to touch one inode, one bitmap buffer, up to three
1127 * indirection blocks, the group and superblock summaries, and the data
1128 * block to complete the transaction. */
1129
1130#define EXT3_SINGLEDATA_TRANS_BLOCKS 8U
1131
1132/* Extended attribute operations touch at most two data buffers,
1133 * two bitmap buffers, and two group summaries, in addition to the inode
1134 * and the superblock, which are already accounted for. */
1135
1136#define EXT3_XATTR_TRANS_BLOCKS 6U
1137
1138/* Define the minimum size for a transaction which modifies data. This
1139 * needs to take into account the fact that we may end up modifying two
1140 * quota files too (one for the group, one for the user quota). The
1141 * superblock only gets updated once, of course, so don't bother
1142 * counting that again for the quota updates. */
1143
1144#define EXT3_DATA_TRANS_BLOCKS(sb) (EXT3_SINGLEDATA_TRANS_BLOCKS + \
1145 EXT3_XATTR_TRANS_BLOCKS - 2 + \
1146 EXT3_MAXQUOTAS_TRANS_BLOCKS(sb))
1147
1148/* Delete operations potentially hit one directory's namespace plus an
1149 * entire inode, plus arbitrary amounts of bitmap/indirection data. Be
1150 * generous. We can grow the delete transaction later if necessary. */
1151
1152#define EXT3_DELETE_TRANS_BLOCKS(sb) (EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) + 64)
1153
1154/* Define an arbitrary limit for the amount of data we will anticipate
1155 * writing to any given transaction. For unbounded transactions such as
1156 * write(2) and truncate(2) we can write more than this, but we always
1157 * start off at the maximum transaction size and grow the transaction
1158 * optimistically as we go. */
1159
1160#define EXT3_MAX_TRANS_DATA 64U
1161
1162/* We break up a large truncate or write transaction once the handle's
1163 * buffer credits gets this low, we need either to extend the
1164 * transaction or to start a new one. Reserve enough space here for
1165 * inode, bitmap, superblock, group and indirection updates for at least
1166 * one block, plus two quota updates. Quota allocations are not
1167 * needed. */
1168
1169#define EXT3_RESERVE_TRANS_BLOCKS 12U
1170
1171#define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8
1172
1173#ifdef CONFIG_QUOTA
1174/* Amount of blocks needed for quota update - we know that the structure was
1175 * allocated so we need to update only inode+data */
1176#define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
1177/* Amount of blocks needed for quota insert/delete - we do some block writes
1178 * but inode, sb and group updates are done only once */
1179#define EXT3_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
1180 (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
1181#define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
1182 (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
1183#else
1184#define EXT3_QUOTA_TRANS_BLOCKS(sb) 0
1185#define EXT3_QUOTA_INIT_BLOCKS(sb) 0
1186#define EXT3_QUOTA_DEL_BLOCKS(sb) 0
1187#endif
a93114e4
JK		 1188#define EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_TRANS_BLOCKS(sb))
1189#define EXT3_MAXQUOTAS_INIT_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_INIT_BLOCKS(sb))
1190#define EXT3_MAXQUOTAS_DEL_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_DEL_BLOCKS(sb))
4613ad18
AV		 1191
1192int
1193ext3_mark_iloc_dirty(handle_t *handle,
1194 struct inode *inode,
1195 struct ext3_iloc *iloc);
1196
1197/*
1198 * On success, We end up with an outstanding reference count against
1199 * iloc->bh. This _must_ be cleaned up later.
1200 */
1201
1202int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
1203 struct ext3_iloc *iloc);
1204
1205int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
1206
1207/*
1208 * Wrapper functions with which ext3 calls into JBD. The intent here is
1209 * to allow these to be turned into appropriate stubs so ext3 can control
1210 * ext2 filesystems, so ext2+ext3 systems only nee one fs. This work hasn't
1211 * been done yet.
1212 */
1213
1214static inline void ext3_journal_release_buffer(handle_t *handle,
1215 struct buffer_head *bh)
1216{
1217 journal_release_buffer(handle, bh);
1218}
1219
1220void ext3_journal_abort_handle(const char *caller, const char *err_fn,
1221 struct buffer_head *bh, handle_t *handle, int err);
1222
1223int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
1224 struct buffer_head *bh);
1225
1226int __ext3_journal_get_write_access(const char *where, handle_t *handle,
1227 struct buffer_head *bh);
1228
1229int __ext3_journal_forget(const char *where, handle_t *handle,
1230 struct buffer_head *bh);
1da177e4 1231
4613ad18
AV		 1232int __ext3_journal_revoke(const char *where, handle_t *handle,
1233 unsigned long blocknr, struct buffer_head *bh);
1234
1235int __ext3_journal_get_create_access(const char *where,
1236 handle_t *handle, struct buffer_head *bh);
1237
1238int __ext3_journal_dirty_metadata(const char *where,
1239 handle_t *handle, struct buffer_head *bh);
1240
1241#define ext3_journal_get_undo_access(handle, bh) \
1242 __ext3_journal_get_undo_access(__func__, (handle), (bh))
1243#define ext3_journal_get_write_access(handle, bh) \
1244 __ext3_journal_get_write_access(__func__, (handle), (bh))
1245#define ext3_journal_revoke(handle, blocknr, bh) \
1246 __ext3_journal_revoke(__func__, (handle), (blocknr), (bh))
1247#define ext3_journal_get_create_access(handle, bh) \
1248 __ext3_journal_get_create_access(__func__, (handle), (bh))
1249#define ext3_journal_dirty_metadata(handle, bh) \
1250 __ext3_journal_dirty_metadata(__func__, (handle), (bh))
1251#define ext3_journal_forget(handle, bh) \
1252 __ext3_journal_forget(__func__, (handle), (bh))
1253
1254int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
1255
1256handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
1257int __ext3_journal_stop(const char *where, handle_t *handle);
1258
1259static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
1260{
1261 return ext3_journal_start_sb(inode->i_sb, nblocks);
1262}
1263
1264#define ext3_journal_stop(handle) \
1265 __ext3_journal_stop(__func__, (handle))
1266
1267static inline handle_t *ext3_journal_current_handle(void)
1268{
1269 return journal_current_handle();
1270}
1271
1272static inline int ext3_journal_extend(handle_t *handle, int nblocks)
1273{
1274 return journal_extend(handle, nblocks);
1275}
1276
1277static inline int ext3_journal_restart(handle_t *handle, int nblocks)
1278{
1279 return journal_restart(handle, nblocks);
1280}
1281
1282static inline int ext3_journal_blocks_per_page(struct inode *inode)
1283{
1284 return journal_blocks_per_page(inode);
1285}
1286
1287static inline int ext3_journal_force_commit(journal_t *journal)
1288{
1289 return journal_force_commit(journal);
1290}
1291
1292/* super.c */
1293int ext3_force_commit(struct super_block *sb);
1294
1295static inline int ext3_should_journal_data(struct inode *inode)
1296{
1297 if (!S_ISREG(inode->i_mode))
1298 return 1;
1299 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
1300 return 1;
1301 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1302 return 1;
1303 return 0;
1304}
1305
1306static inline int ext3_should_order_data(struct inode *inode)
1307{
1308 if (!S_ISREG(inode->i_mode))
1309 return 0;
1310 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1311 return 0;
1312 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
1313 return 1;
1314 return 0;
1315}
1316
1317static inline int ext3_should_writeback_data(struct inode *inode)
1318{
1319 if (!S_ISREG(inode->i_mode))
1320 return 0;
1321 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
1322 return 0;
1323 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
1324 return 1;
1325 return 0;
1326}
1da177e4 1327
4613ad18 1328#include <trace/events/ext3.h>
Linux kernel - Deliverables
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