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/* Number of supported quota types */ 241#define EXT3_MAXQUOTAS 2 242 243/* 244 * Mount options 245 */ 246struct ext3_mount_options { 247 unsigned long s_mount_opt; 248 kuid_t s_resuid; 249 kgid_t s_resgid; 250 unsigned long s_commit_interval; 251#ifdef CONFIG_QUOTA 252 int s_jquota_fmt; 253 char *s_qf_names[EXT3_MAXQUOTAS]; 254#endif 255}; 256 257/* 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 317 318#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 326 327/* 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 */ 333 334/* 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 */ 340 341/* 342 * Mount flags 343 */ 344#define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */ 345/* EXT3_MOUNT_OLDALLOC was there */ 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 */ 364#define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */ 365#define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 366#define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 367#define EXT3_MOUNT_DATA_ERR_ABORT 0x400000 /* Abort on file data write 368 * error in ordered mode */ 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 381 382#define ext3_set_bit __set_bit_le 383#define ext3_set_bit_atomic ext2_set_bit_atomic 384#define ext3_clear_bit __clear_bit_le 385#define ext3_clear_bit_atomic ext2_clear_bit_atomic 386#define ext3_test_bit test_bit_le 387#define ext3_find_next_zero_bit find_next_zero_bit_le 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 */ 461 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 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; 474 __le32 s_first_meta_bg; /* First metablock block group */ 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 */ 492}; 493 494/* 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#ifdef CONFIG_QUOTA 619 struct dquot *i_dquot[MAXQUOTAS]; 620#endif 621 622 struct inode vfs_inode; 623}; 624 625/* 626 * third extended-fs super-block data in memory 627 */ 628struct ext3_sb_info { 629 unsigned long s_frag_size; /* Size of a fragment in bytes */ 630 unsigned long s_frags_per_block;/* Number of fragments per block */ 631 unsigned long s_inodes_per_block;/* Number of inodes per block */ 632 unsigned long s_frags_per_group;/* Number of fragments in a group */ 633 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 634 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 635 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 636 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 637 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 638 unsigned long s_groups_count; /* Number of groups in the fs */ 639 unsigned long s_overhead_last; /* Last calculated overhead */ 640 unsigned long s_blocks_last; /* Last seen block count */ 641 struct buffer_head * s_sbh; /* Buffer containing the super block */ 642 struct ext3_super_block * s_es; /* Pointer to the super block in the buffer */ 643 struct buffer_head ** s_group_desc; 644 unsigned long s_mount_opt; 645 ext3_fsblk_t s_sb_block; 646 kuid_t s_resuid; 647 kgid_t s_resgid; 648 unsigned short s_mount_state; 649 unsigned short s_pad; 650 int s_addr_per_block_bits; 651 int s_desc_per_block_bits; 652 int s_inode_size; 653 int s_first_ino; 654 spinlock_t s_next_gen_lock; 655 u32 s_next_generation; 656 u32 s_hash_seed[4]; 657 int s_def_hash_version; 658 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 659 struct percpu_counter s_freeblocks_counter; 660 struct percpu_counter s_freeinodes_counter; 661 struct percpu_counter s_dirs_counter; 662 struct blockgroup_lock *s_blockgroup_lock; 663 664 /* root of the per fs reservation window tree */ 665 spinlock_t s_rsv_window_lock; 666 struct rb_root s_rsv_window_root; 667 struct ext3_reserve_window_node s_rsv_window_head; 668 669 /* Journaling */ 670 struct inode * s_journal_inode; 671 struct journal_s * s_journal; 672 struct list_head s_orphan; 673 struct mutex s_orphan_lock; 674 struct mutex s_resize_lock; 675 unsigned long s_commit_interval; 676 struct block_device *journal_bdev; 677#ifdef CONFIG_QUOTA 678 char *s_qf_names[EXT3_MAXQUOTAS]; /* Names of quota files with journalled quota */ 679 int s_jquota_fmt; /* Format of quota to use */ 680#endif 681}; 682 683static inline spinlock_t * 684sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group) 685{ 686 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); 687} 688 689static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb) 690{ 691 return sb->s_fs_info; 692} 693static inline struct ext3_inode_info *EXT3_I(struct inode *inode) 694{ 695 return container_of(inode, struct ext3_inode_info, vfs_inode); 696} 697 698static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino) 699{ 700 return ino == EXT3_ROOT_INO || 701 ino == EXT3_JOURNAL_INO || 702 ino == EXT3_RESIZE_INO || 703 (ino >= EXT3_FIRST_INO(sb) && 704 ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count)); 705} 706 707/* 708 * Inode dynamic state flags 709 */ 710enum { 711 EXT3_STATE_JDATA, /* journaled data exists */ 712 EXT3_STATE_NEW, /* inode is newly created */ 713 EXT3_STATE_XATTR, /* has in-inode xattrs */ 714 EXT3_STATE_FLUSH_ON_CLOSE, /* flush dirty pages on close */ 715}; 716 717static inline int ext3_test_inode_state(struct inode *inode, int bit) 718{ 719 return test_bit(bit, &EXT3_I(inode)->i_state_flags); 720} 721 722static inline void ext3_set_inode_state(struct inode *inode, int bit) 723{ 724 set_bit(bit, &EXT3_I(inode)->i_state_flags); 725} 726 727static inline void ext3_clear_inode_state(struct inode *inode, int bit) 728{ 729 clear_bit(bit, &EXT3_I(inode)->i_state_flags); 730} 731 732#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime 733 734/* 735 * Codes for operating systems 736 */ 737#define EXT3_OS_LINUX 0 738#define EXT3_OS_HURD 1 739#define EXT3_OS_MASIX 2 740#define EXT3_OS_FREEBSD 3 741#define EXT3_OS_LITES 4 742 743/* 744 * Revision levels 745 */ 746#define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */ 747#define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 748 749#define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV 750#define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV 751 752#define EXT3_GOOD_OLD_INODE_SIZE 128 753 754/* 755 * Feature set definitions 756 */ 757 758#define EXT3_HAS_COMPAT_FEATURE(sb,mask) \ 759 ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 760#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \ 761 ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 762#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \ 763 ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 764#define EXT3_SET_COMPAT_FEATURE(sb,mask) \ 765 EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 766#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \ 767 EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 768#define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \ 769 EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 770#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \ 771 EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 772#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 773 EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 774#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 775 EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 776 777#define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001 778#define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002 779#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 780#define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008 781#define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010 782#define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020 783 784#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 785#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 786#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 787 788#define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001 789#define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002 790#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 791#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 792#define EXT3_FEATURE_INCOMPAT_META_BG 0x0010 793 794#define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 795#define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \ 796 EXT3_FEATURE_INCOMPAT_RECOVER| \ 797 EXT3_FEATURE_INCOMPAT_META_BG) 798#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 799 EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \ 800 EXT3_FEATURE_RO_COMPAT_BTREE_DIR) 801 802/* 803 * Default values for user and/or group using reserved blocks 804 */ 805#define EXT3_DEF_RESUID 0 806#define EXT3_DEF_RESGID 0 807 808/* 809 * Default mount options 810 */ 811#define EXT3_DEFM_DEBUG 0x0001 812#define EXT3_DEFM_BSDGROUPS 0x0002 813#define EXT3_DEFM_XATTR_USER 0x0004 814#define EXT3_DEFM_ACL 0x0008 815#define EXT3_DEFM_UID16 0x0010 816#define EXT3_DEFM_JMODE 0x0060 817#define EXT3_DEFM_JMODE_DATA 0x0020 818#define EXT3_DEFM_JMODE_ORDERED 0x0040 819#define EXT3_DEFM_JMODE_WBACK 0x0060 820 821/* 822 * Structure of a directory entry 823 */ 824#define EXT3_NAME_LEN 255 825 826struct ext3_dir_entry { 827 __le32 inode; /* Inode number */ 828 __le16 rec_len; /* Directory entry length */ 829 __le16 name_len; /* Name length */ 830 char name[EXT3_NAME_LEN]; /* File name */ 831}; 832 833/* 834 * The new version of the directory entry. Since EXT3 structures are 835 * stored in intel byte order, and the name_len field could never be 836 * bigger than 255 chars, it's safe to reclaim the extra byte for the 837 * file_type field. 838 */ 839struct ext3_dir_entry_2 { 840 __le32 inode; /* Inode number */ 841 __le16 rec_len; /* Directory entry length */ 842 __u8 name_len; /* Name length */ 843 __u8 file_type; 844 char name[EXT3_NAME_LEN]; /* File name */ 845}; 846 847/* 848 * Ext3 directory file types. Only the low 3 bits are used. The 849 * other bits are reserved for now. 850 */ 851#define EXT3_FT_UNKNOWN 0 852#define EXT3_FT_REG_FILE 1 853#define EXT3_FT_DIR 2 854#define EXT3_FT_CHRDEV 3 855#define EXT3_FT_BLKDEV 4 856#define EXT3_FT_FIFO 5 857#define EXT3_FT_SOCK 6 858#define EXT3_FT_SYMLINK 7 859 860#define EXT3_FT_MAX 8 861 862/* 863 * EXT3_DIR_PAD defines the directory entries boundaries 864 * 865 * NOTE: It must be a multiple of 4 866 */ 867#define EXT3_DIR_PAD 4 868#define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1) 869#define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \ 870 ~EXT3_DIR_ROUND) 871#define EXT3_MAX_REC_LEN ((1<<16)-1) 872 873/* 874 * Tests against MAX_REC_LEN etc were put in place for 64k block 875 * sizes; if that is not possible on this arch, we can skip 876 * those tests and speed things up. 877 */ 878static inline unsigned ext3_rec_len_from_disk(__le16 dlen) 879{ 880 unsigned len = le16_to_cpu(dlen); 881 882#if (PAGE_CACHE_SIZE >= 65536) 883 if (len == EXT3_MAX_REC_LEN) 884 return 1 << 16; 885#endif 886 return len; 887} 888 889static inline __le16 ext3_rec_len_to_disk(unsigned len) 890{ 891#if (PAGE_CACHE_SIZE >= 65536) 892 if (len == (1 << 16)) 893 return cpu_to_le16(EXT3_MAX_REC_LEN); 894 else if (len > (1 << 16)) 895 BUG(); 896#endif 897 return cpu_to_le16(len); 898} 899 900/* 901 * Hash Tree Directory indexing 902 * (c) Daniel Phillips, 2001 903 */ 904 905#define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \ 906 EXT3_FEATURE_COMPAT_DIR_INDEX) && \ 907 (EXT3_I(dir)->i_flags & EXT3_INDEX_FL)) 908#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX) 909#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 910 911/* Legal values for the dx_root hash_version field: */ 912 913#define DX_HASH_LEGACY 0 914#define DX_HASH_HALF_MD4 1 915#define DX_HASH_TEA 2 916#define DX_HASH_LEGACY_UNSIGNED 3 917#define DX_HASH_HALF_MD4_UNSIGNED 4 918#define DX_HASH_TEA_UNSIGNED 5 919 920/* hash info structure used by the directory hash */ 921struct dx_hash_info 922{ 923 u32 hash; 924 u32 minor_hash; 925 int hash_version; 926 u32 *seed; 927}; 928 929 930/* 32 and 64 bit signed EOF for dx directories */ 931#define EXT3_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1) 932#define EXT3_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1) 933 934 935/* 936 * Control parameters used by ext3_htree_next_block 937 */ 938#define HASH_NB_ALWAYS 1 939 940 941/* 942 * Describe an inode's exact location on disk and in memory 943 */ 944struct ext3_iloc 945{ 946 struct buffer_head *bh; 947 unsigned long offset; 948 unsigned long block_group; 949}; 950 951static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc) 952{ 953 return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset); 954} 955 956/* 957 * This structure is stuffed into the struct file's private_data field 958 * for directories. It is where we put information so that we can do 959 * readdir operations in hash tree order. 960 */ 961struct dir_private_info { 962 struct rb_root root; 963 struct rb_node *curr_node; 964 struct fname *extra_fname; 965 loff_t last_pos; 966 __u32 curr_hash; 967 __u32 curr_minor_hash; 968 __u32 next_hash; 969}; 970 971/* calculate the first block number of the group */ 972static inline ext3_fsblk_t 973ext3_group_first_block_no(struct super_block *sb, unsigned long group_no) 974{ 975 return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) + 976 le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block); 977} 978 979/* 980 * Special error return code only used by dx_probe() and its callers. 981 */ 982#define ERR_BAD_DX_DIR -75000 983 984/* 985 * Function prototypes 986 */ 987 988/* 989 * Ok, these declarations are also in <linux/kernel.h> but none of the 990 * ext3 source programs needs to include it so they are duplicated here. 991 */ 992# define NORET_TYPE /**/ 993# define ATTRIB_NORET __attribute__((noreturn)) 994# define NORET_AND noreturn, 995 996/* balloc.c */ 997extern int ext3_bg_has_super(struct super_block *sb, int group); 998extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group); 999extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode, 1000 ext3_fsblk_t goal, int *errp); 1001extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode, 1002 ext3_fsblk_t goal, unsigned long *count, int *errp); 1003extern void ext3_free_blocks (handle_t *handle, struct inode *inode, 1004 ext3_fsblk_t block, unsigned long count); 1005extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb, 1006 ext3_fsblk_t block, unsigned long count, 1007 unsigned long *pdquot_freed_blocks); 1008extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *); 1009extern void ext3_check_blocks_bitmap (struct super_block *); 1010extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb, 1011 unsigned int block_group, 1012 struct buffer_head ** bh); 1013extern int ext3_should_retry_alloc(struct super_block *sb, int *retries); 1014extern void ext3_init_block_alloc_info(struct inode *); 1015extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv); 1016extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range); 1017 1018/* dir.c */ 1019extern int ext3_check_dir_entry(const char *, struct inode *, 1020 struct ext3_dir_entry_2 *, 1021 struct buffer_head *, unsigned long); 1022extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash, 1023 __u32 minor_hash, 1024 struct ext3_dir_entry_2 *dirent); 1025extern void ext3_htree_free_dir_info(struct dir_private_info *p); 1026 1027/* fsync.c */ 1028extern int ext3_sync_file(struct file *, loff_t, loff_t, int); 1029 1030/* hash.c */ 1031extern int ext3fs_dirhash(const char *name, int len, struct 1032 dx_hash_info *hinfo); 1033 1034/* ialloc.c */ 1035extern struct inode * ext3_new_inode (handle_t *, struct inode *, 1036 const struct qstr *, umode_t); 1037extern void ext3_free_inode (handle_t *, struct inode *); 1038extern struct inode * ext3_orphan_get (struct super_block *, unsigned long); 1039extern unsigned long ext3_count_free_inodes (struct super_block *); 1040extern unsigned long ext3_count_dirs (struct super_block *); 1041extern void ext3_check_inodes_bitmap (struct super_block *); 1042extern unsigned long ext3_count_free (struct buffer_head *, unsigned); 1043 1044 1045/* inode.c */ 1046int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode, 1047 struct buffer_head *bh, ext3_fsblk_t blocknr); 1048struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *); 1049struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *); 1050int ext3_get_blocks_handle(handle_t *handle, struct inode *inode, 1051 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result, 1052 int create); 1053 1054extern struct inode *ext3_iget(struct super_block *, unsigned long); 1055extern int ext3_write_inode (struct inode *, struct writeback_control *); 1056extern int ext3_setattr (struct dentry *, struct iattr *); 1057extern void ext3_evict_inode (struct inode *); 1058extern int ext3_sync_inode (handle_t *, struct inode *); 1059extern void ext3_discard_reservation (struct inode *); 1060extern void ext3_dirty_inode(struct inode *, int); 1061extern int ext3_change_inode_journal_flag(struct inode *, int); 1062extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *); 1063extern int ext3_can_truncate(struct inode *inode); 1064extern void ext3_truncate(struct inode *inode); 1065extern void ext3_set_inode_flags(struct inode *); 1066extern void ext3_get_inode_flags(struct ext3_inode_info *); 1067extern void ext3_set_aops(struct inode *inode); 1068extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1069 u64 start, u64 len); 1070 1071/* ioctl.c */ 1072extern long ext3_ioctl(struct file *, unsigned int, unsigned long); 1073extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long); 1074 1075/* namei.c */ 1076extern int ext3_orphan_add(handle_t *, struct inode *); 1077extern int ext3_orphan_del(handle_t *, struct inode *); 1078extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1079 __u32 start_minor_hash, __u32 *next_hash); 1080 1081/* resize.c */ 1082extern int ext3_group_add(struct super_block *sb, 1083 struct ext3_new_group_data *input); 1084extern int ext3_group_extend(struct super_block *sb, 1085 struct ext3_super_block *es, 1086 ext3_fsblk_t n_blocks_count); 1087 1088/* super.c */ 1089extern __printf(3, 4) 1090void ext3_error(struct super_block *, const char *, const char *, ...); 1091extern void __ext3_std_error (struct super_block *, const char *, int); 1092extern __printf(3, 4) 1093void ext3_abort(struct super_block *, const char *, const char *, ...); 1094extern __printf(3, 4) 1095void ext3_warning(struct super_block *, const char *, const char *, ...); 1096extern __printf(3, 4) 1097void ext3_msg(struct super_block *, const char *, const char *, ...); 1098extern void ext3_update_dynamic_rev (struct super_block *sb); 1099 1100#define ext3_std_error(sb, errno) \ 1101do { \ 1102 if ((errno)) \ 1103 __ext3_std_error((sb), __func__, (errno)); \ 1104} while (0) 1105 1106/* 1107 * Inodes and files operations 1108 */ 1109 1110/* dir.c */ 1111extern const struct file_operations ext3_dir_operations; 1112 1113/* file.c */ 1114extern const struct inode_operations ext3_file_inode_operations; 1115extern const struct file_operations ext3_file_operations; 1116 1117/* namei.c */ 1118extern const struct inode_operations ext3_dir_inode_operations; 1119extern const struct inode_operations ext3_special_inode_operations; 1120 1121/* symlink.c */ 1122extern const struct inode_operations ext3_symlink_inode_operations; 1123extern const struct inode_operations ext3_fast_symlink_inode_operations; 1124 1125#define EXT3_JOURNAL(inode) (EXT3_SB((inode)->i_sb)->s_journal) 1126 1127/* Define the number of blocks we need to account to a transaction to 1128 * modify one block of data. 1129 * 1130 * We may have to touch one inode, one bitmap buffer, up to three 1131 * indirection blocks, the group and superblock summaries, and the data 1132 * block to complete the transaction. */ 1133 1134#define EXT3_SINGLEDATA_TRANS_BLOCKS 8U 1135 1136/* Extended attribute operations touch at most two data buffers, 1137 * two bitmap buffers, and two group summaries, in addition to the inode 1138 * and the superblock, which are already accounted for. */ 1139 1140#define EXT3_XATTR_TRANS_BLOCKS 6U 1141 1142/* Define the minimum size for a transaction which modifies data. This 1143 * needs to take into account the fact that we may end up modifying two 1144 * quota files too (one for the group, one for the user quota). The 1145 * superblock only gets updated once, of course, so don't bother 1146 * counting that again for the quota updates. */ 1147 1148#define EXT3_DATA_TRANS_BLOCKS(sb) (EXT3_SINGLEDATA_TRANS_BLOCKS + \ 1149 EXT3_XATTR_TRANS_BLOCKS - 2 + \ 1150 EXT3_MAXQUOTAS_TRANS_BLOCKS(sb)) 1151 1152/* Delete operations potentially hit one directory's namespace plus an 1153 * entire inode, plus arbitrary amounts of bitmap/indirection data. Be 1154 * generous. We can grow the delete transaction later if necessary. */ 1155 1156#define EXT3_DELETE_TRANS_BLOCKS(sb) (EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) + 64) 1157 1158/* Define an arbitrary limit for the amount of data we will anticipate 1159 * writing to any given transaction. For unbounded transactions such as 1160 * write(2) and truncate(2) we can write more than this, but we always 1161 * start off at the maximum transaction size and grow the transaction 1162 * optimistically as we go. */ 1163 1164#define EXT3_MAX_TRANS_DATA 64U 1165 1166/* We break up a large truncate or write transaction once the handle's 1167 * buffer credits gets this low, we need either to extend the 1168 * transaction or to start a new one. Reserve enough space here for 1169 * inode, bitmap, superblock, group and indirection updates for at least 1170 * one block, plus two quota updates. Quota allocations are not 1171 * needed. */ 1172 1173#define EXT3_RESERVE_TRANS_BLOCKS 12U 1174 1175#define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8 1176 1177#ifdef CONFIG_QUOTA 1178/* Amount of blocks needed for quota update - we know that the structure was 1179 * allocated so we need to update only inode+data */ 1180#define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0) 1181/* Amount of blocks needed for quota insert/delete - we do some block writes 1182 * but inode, sb and group updates are done only once */ 1183#define EXT3_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\ 1184 (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0) 1185#define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\ 1186 (EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0) 1187#else 1188#define EXT3_QUOTA_TRANS_BLOCKS(sb) 0 1189#define EXT3_QUOTA_INIT_BLOCKS(sb) 0 1190#define EXT3_QUOTA_DEL_BLOCKS(sb) 0 1191#endif 1192#define EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_TRANS_BLOCKS(sb)) 1193#define EXT3_MAXQUOTAS_INIT_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_INIT_BLOCKS(sb)) 1194#define EXT3_MAXQUOTAS_DEL_BLOCKS(sb) (EXT3_MAXQUOTAS*EXT3_QUOTA_DEL_BLOCKS(sb)) 1195 1196int 1197ext3_mark_iloc_dirty(handle_t *handle, 1198 struct inode *inode, 1199 struct ext3_iloc *iloc); 1200 1201/* 1202 * On success, We end up with an outstanding reference count against 1203 * iloc->bh. This _must_ be cleaned up later. 1204 */ 1205 1206int ext3_reserve_inode_write(handle_t *handle, struct inode *inode, 1207 struct ext3_iloc *iloc); 1208 1209int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode); 1210 1211/* 1212 * Wrapper functions with which ext3 calls into JBD. The intent here is 1213 * to allow these to be turned into appropriate stubs so ext3 can control 1214 * ext2 filesystems, so ext2+ext3 systems only nee one fs. This work hasn't 1215 * been done yet. 1216 */ 1217 1218static inline void ext3_journal_release_buffer(handle_t *handle, 1219 struct buffer_head *bh) 1220{ 1221 journal_release_buffer(handle, bh); 1222} 1223 1224void ext3_journal_abort_handle(const char *caller, const char *err_fn, 1225 struct buffer_head *bh, handle_t *handle, int err); 1226 1227int __ext3_journal_get_undo_access(const char *where, handle_t *handle, 1228 struct buffer_head *bh); 1229 1230int __ext3_journal_get_write_access(const char *where, handle_t *handle, 1231 struct buffer_head *bh); 1232 1233int __ext3_journal_forget(const char *where, handle_t *handle, 1234 struct buffer_head *bh); 1235 1236int __ext3_journal_revoke(const char *where, handle_t *handle, 1237 unsigned long blocknr, struct buffer_head *bh); 1238 1239int __ext3_journal_get_create_access(const char *where, 1240 handle_t *handle, struct buffer_head *bh); 1241 1242int __ext3_journal_dirty_metadata(const char *where, 1243 handle_t *handle, struct buffer_head *bh); 1244 1245#define ext3_journal_get_undo_access(handle, bh) \ 1246 __ext3_journal_get_undo_access(__func__, (handle), (bh)) 1247#define ext3_journal_get_write_access(handle, bh) \ 1248 __ext3_journal_get_write_access(__func__, (handle), (bh)) 1249#define ext3_journal_revoke(handle, blocknr, bh) \ 1250 __ext3_journal_revoke(__func__, (handle), (blocknr), (bh)) 1251#define ext3_journal_get_create_access(handle, bh) \ 1252 __ext3_journal_get_create_access(__func__, (handle), (bh)) 1253#define ext3_journal_dirty_metadata(handle, bh) \ 1254 __ext3_journal_dirty_metadata(__func__, (handle), (bh)) 1255#define ext3_journal_forget(handle, bh) \ 1256 __ext3_journal_forget(__func__, (handle), (bh)) 1257 1258int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh); 1259 1260handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks); 1261int __ext3_journal_stop(const char *where, handle_t *handle); 1262 1263static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks) 1264{ 1265 return ext3_journal_start_sb(inode->i_sb, nblocks); 1266} 1267 1268#define ext3_journal_stop(handle) \ 1269 __ext3_journal_stop(__func__, (handle)) 1270 1271static inline handle_t *ext3_journal_current_handle(void) 1272{ 1273 return journal_current_handle(); 1274} 1275 1276static inline int ext3_journal_extend(handle_t *handle, int nblocks) 1277{ 1278 return journal_extend(handle, nblocks); 1279} 1280 1281static inline int ext3_journal_restart(handle_t *handle, int nblocks) 1282{ 1283 return journal_restart(handle, nblocks); 1284} 1285 1286static inline int ext3_journal_blocks_per_page(struct inode *inode) 1287{ 1288 return journal_blocks_per_page(inode); 1289} 1290 1291static inline int ext3_journal_force_commit(journal_t *journal) 1292{ 1293 return journal_force_commit(journal); 1294} 1295 1296/* super.c */ 1297int ext3_force_commit(struct super_block *sb); 1298 1299static inline int ext3_should_journal_data(struct inode *inode) 1300{ 1301 if (!S_ISREG(inode->i_mode)) 1302 return 1; 1303 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA) 1304 return 1; 1305 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL) 1306 return 1; 1307 return 0; 1308} 1309 1310static inline int ext3_should_order_data(struct inode *inode) 1311{ 1312 if (!S_ISREG(inode->i_mode)) 1313 return 0; 1314 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL) 1315 return 0; 1316 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA) 1317 return 1; 1318 return 0; 1319} 1320 1321static inline int ext3_should_writeback_data(struct inode *inode) 1322{ 1323 if (!S_ISREG(inode->i_mode)) 1324 return 0; 1325 if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL) 1326 return 0; 1327 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA) 1328 return 1; 1329 return 0; 1330} 1331 1332#include <trace/events/ext3.h> 1333