1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include "ext4_i.h" 25 26 /* 27 * The fourth extended filesystem constants/structures 28 */ 29 30 /* 31 * Define EXT4FS_DEBUG to produce debug messages 32 */ 33 #undef EXT4FS_DEBUG 34 35 /* 36 * Define EXT4_RESERVATION to reserve data blocks for expanding files 37 */ 38 #define EXT4_DEFAULT_RESERVE_BLOCKS 8 39 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 40 #define EXT4_MAX_RESERVE_BLOCKS 1027 41 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0 42 43 /* 44 * Debug code 45 */ 46 #ifdef EXT4FS_DEBUG 47 #define ext4_debug(f, a...) \ 48 do { \ 49 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 50 __FILE__, __LINE__, __func__); \ 51 printk(KERN_DEBUG f, ## a); \ 52 } while (0) 53 #else 54 #define ext4_debug(f, a...) do {} while (0) 55 #endif 56 57 #define EXT4_MULTIBLOCK_ALLOCATOR 1 58 59 /* prefer goal again. length */ 60 #define EXT4_MB_HINT_MERGE 1 61 /* blocks already reserved */ 62 #define EXT4_MB_HINT_RESERVED 2 63 /* metadata is being allocated */ 64 #define EXT4_MB_HINT_METADATA 4 65 /* first blocks in the file */ 66 #define EXT4_MB_HINT_FIRST 8 67 /* search for the best chunk */ 68 #define EXT4_MB_HINT_BEST 16 69 /* data is being allocated */ 70 #define EXT4_MB_HINT_DATA 32 71 /* don't preallocate (for tails) */ 72 #define EXT4_MB_HINT_NOPREALLOC 64 73 /* allocate for locality group */ 74 #define EXT4_MB_HINT_GROUP_ALLOC 128 75 /* allocate goal blocks or none */ 76 #define EXT4_MB_HINT_GOAL_ONLY 256 77 /* goal is meaningful */ 78 #define EXT4_MB_HINT_TRY_GOAL 512 79 /* blocks already pre-reserved by delayed allocation */ 80 #define EXT4_MB_DELALLOC_RESERVED 1024 81 82 83 struct ext4_allocation_request { 84 /* target inode for block we're allocating */ 85 struct inode *inode; 86 /* logical block in target inode */ 87 ext4_lblk_t logical; 88 /* phys. target (a hint) */ 89 ext4_fsblk_t goal; 90 /* the closest logical allocated block to the left */ 91 ext4_lblk_t lleft; 92 /* phys. block for ^^^ */ 93 ext4_fsblk_t pleft; 94 /* the closest logical allocated block to the right */ 95 ext4_lblk_t lright; 96 /* phys. block for ^^^ */ 97 ext4_fsblk_t pright; 98 /* how many blocks we want to allocate */ 99 unsigned int len; 100 /* flags. see above EXT4_MB_HINT_* */ 101 unsigned int flags; 102 }; 103 104 /* 105 * Special inodes numbers 106 */ 107 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 108 #define EXT4_ROOT_INO 2 /* Root inode */ 109 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 110 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 111 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 112 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 113 114 /* First non-reserved inode for old ext4 filesystems */ 115 #define EXT4_GOOD_OLD_FIRST_INO 11 116 117 /* 118 * Maximal count of links to a file 119 */ 120 #define EXT4_LINK_MAX 65000 121 122 /* 123 * Macro-instructions used to manage several block sizes 124 */ 125 #define EXT4_MIN_BLOCK_SIZE 1024 126 #define EXT4_MAX_BLOCK_SIZE 65536 127 #define EXT4_MIN_BLOCK_LOG_SIZE 10 128 #ifdef __KERNEL__ 129 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 130 #else 131 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 132 #endif 133 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 134 #ifdef __KERNEL__ 135 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 136 #else 137 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 138 #endif 139 #ifdef __KERNEL__ 140 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 141 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 142 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 143 #else 144 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 145 EXT4_GOOD_OLD_INODE_SIZE : \ 146 (s)->s_inode_size) 147 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 148 EXT4_GOOD_OLD_FIRST_INO : \ 149 (s)->s_first_ino) 150 #endif 151 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 152 153 /* 154 * Structure of a blocks group descriptor 155 */ 156 struct ext4_group_desc 157 { 158 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 159 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 160 __le32 bg_inode_table_lo; /* Inodes table block */ 161 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 162 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 163 __le16 bg_used_dirs_count_lo; /* Directories count */ 164 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 165 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 166 __le16 bg_itable_unused_lo; /* Unused inodes count */ 167 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 168 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 169 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 170 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 171 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 172 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 173 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 174 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 175 __u32 bg_reserved2[3]; 176 }; 177 178 /* 179 * Structure of a flex block group info 180 */ 181 182 struct flex_groups { 183 __u32 free_inodes; 184 __u32 free_blocks; 185 }; 186 187 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 188 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 189 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 190 191 #ifdef __KERNEL__ 192 #include "ext4_sb.h" 193 #endif 194 /* 195 * Macro-instructions used to manage group descriptors 196 */ 197 #define EXT4_MIN_DESC_SIZE 32 198 #define EXT4_MIN_DESC_SIZE_64BIT 64 199 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 200 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 201 #ifdef __KERNEL__ 202 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 203 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 204 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 205 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 206 #else 207 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 208 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 209 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 210 #endif 211 212 /* 213 * Constants relative to the data blocks 214 */ 215 #define EXT4_NDIR_BLOCKS 12 216 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 217 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 218 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 219 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 220 221 /* 222 * Inode flags 223 */ 224 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 225 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 226 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 227 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 228 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 229 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 230 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 231 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 232 /* Reserved for compression usage... */ 233 #define EXT4_DIRTY_FL 0x00000100 234 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 235 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 236 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 237 /* End compression flags --- maybe not all used */ 238 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 239 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 240 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 241 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 242 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 243 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 244 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 245 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 246 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ 247 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 248 249 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 250 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ 251 252 /* 253 * Inode dynamic state flags 254 */ 255 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 256 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 257 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 258 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 259 260 /* Used to pass group descriptor data when online resize is done */ 261 struct ext4_new_group_input { 262 __u32 group; /* Group number for this data */ 263 __u64 block_bitmap; /* Absolute block number of block bitmap */ 264 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 265 __u64 inode_table; /* Absolute block number of inode table start */ 266 __u32 blocks_count; /* Total number of blocks in this group */ 267 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 268 __u16 unused; 269 }; 270 271 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 272 struct ext4_new_group_data { 273 __u32 group; 274 __u64 block_bitmap; 275 __u64 inode_bitmap; 276 __u64 inode_table; 277 __u32 blocks_count; 278 __u16 reserved_blocks; 279 __u16 unused; 280 __u32 free_blocks_count; 281 }; 282 283 /* 284 * Following is used by preallocation code to tell get_blocks() that we 285 * want uninitialzed extents. 286 */ 287 #define EXT4_CREATE_UNINITIALIZED_EXT 2 288 289 /* 290 * ioctl commands 291 */ 292 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 293 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 294 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 295 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 296 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 297 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 298 #ifdef CONFIG_JBD2_DEBUG 299 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 300 #endif 301 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 302 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 303 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 304 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 305 #define EXT4_IOC_MIGRATE _IO('f', 9) 306 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 307 308 /* 309 * ioctl commands in 32 bit emulation 310 */ 311 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 312 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 313 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 314 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 315 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 316 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 317 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 318 #ifdef CONFIG_JBD2_DEBUG 319 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 320 #endif 321 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 322 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 323 324 325 /* 326 * Mount options 327 */ 328 struct ext4_mount_options { 329 unsigned long s_mount_opt; 330 uid_t s_resuid; 331 gid_t s_resgid; 332 unsigned long s_commit_interval; 333 u32 s_min_batch_time, s_max_batch_time; 334 #ifdef CONFIG_QUOTA 335 int s_jquota_fmt; 336 char *s_qf_names[MAXQUOTAS]; 337 #endif 338 }; 339 340 /* 341 * Structure of an inode on the disk 342 */ 343 struct ext4_inode { 344 __le16 i_mode; /* File mode */ 345 __le16 i_uid; /* Low 16 bits of Owner Uid */ 346 __le32 i_size_lo; /* Size in bytes */ 347 __le32 i_atime; /* Access time */ 348 __le32 i_ctime; /* Inode Change time */ 349 __le32 i_mtime; /* Modification time */ 350 __le32 i_dtime; /* Deletion Time */ 351 __le16 i_gid; /* Low 16 bits of Group Id */ 352 __le16 i_links_count; /* Links count */ 353 __le32 i_blocks_lo; /* Blocks count */ 354 __le32 i_flags; /* File flags */ 355 union { 356 struct { 357 __le32 l_i_version; 358 } linux1; 359 struct { 360 __u32 h_i_translator; 361 } hurd1; 362 struct { 363 __u32 m_i_reserved1; 364 } masix1; 365 } osd1; /* OS dependent 1 */ 366 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 367 __le32 i_generation; /* File version (for NFS) */ 368 __le32 i_file_acl_lo; /* File ACL */ 369 __le32 i_size_high; 370 __le32 i_obso_faddr; /* Obsoleted fragment address */ 371 union { 372 struct { 373 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 374 __le16 l_i_file_acl_high; 375 __le16 l_i_uid_high; /* these 2 fields */ 376 __le16 l_i_gid_high; /* were reserved2[0] */ 377 __u32 l_i_reserved2; 378 } linux2; 379 struct { 380 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 381 __u16 h_i_mode_high; 382 __u16 h_i_uid_high; 383 __u16 h_i_gid_high; 384 __u32 h_i_author; 385 } hurd2; 386 struct { 387 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 388 __le16 m_i_file_acl_high; 389 __u32 m_i_reserved2[2]; 390 } masix2; 391 } osd2; /* OS dependent 2 */ 392 __le16 i_extra_isize; 393 __le16 i_pad1; 394 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 395 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 396 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 397 __le32 i_crtime; /* File Creation time */ 398 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 399 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 400 }; 401 402 403 #define EXT4_EPOCH_BITS 2 404 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 405 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 406 407 /* 408 * Extended fields will fit into an inode if the filesystem was formatted 409 * with large inodes (-I 256 or larger) and there are not currently any EAs 410 * consuming all of the available space. For new inodes we always reserve 411 * enough space for the kernel's known extended fields, but for inodes 412 * created with an old kernel this might not have been the case. None of 413 * the extended inode fields is critical for correct filesystem operation. 414 * This macro checks if a certain field fits in the inode. Note that 415 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 416 */ 417 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 418 ((offsetof(typeof(*ext4_inode), field) + \ 419 sizeof((ext4_inode)->field)) \ 420 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 421 (einode)->i_extra_isize)) \ 422 423 static inline __le32 ext4_encode_extra_time(struct timespec *time) 424 { 425 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 426 time->tv_sec >> 32 : 0) | 427 ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 428 } 429 430 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 431 { 432 if (sizeof(time->tv_sec) > 4) 433 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 434 << 32; 435 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 436 } 437 438 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 439 do { \ 440 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 441 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 442 (raw_inode)->xtime ## _extra = \ 443 ext4_encode_extra_time(&(inode)->xtime); \ 444 } while (0) 445 446 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 447 do { \ 448 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 449 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 450 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 451 (raw_inode)->xtime ## _extra = \ 452 ext4_encode_extra_time(&(einode)->xtime); \ 453 } while (0) 454 455 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 456 do { \ 457 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 458 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 459 ext4_decode_extra_time(&(inode)->xtime, \ 460 raw_inode->xtime ## _extra); \ 461 } while (0) 462 463 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 464 do { \ 465 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 466 (einode)->xtime.tv_sec = \ 467 (signed)le32_to_cpu((raw_inode)->xtime); \ 468 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 469 ext4_decode_extra_time(&(einode)->xtime, \ 470 raw_inode->xtime ## _extra); \ 471 } while (0) 472 473 #define i_disk_version osd1.linux1.l_i_version 474 475 #if defined(__KERNEL__) || defined(__linux__) 476 #define i_reserved1 osd1.linux1.l_i_reserved1 477 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 478 #define i_blocks_high osd2.linux2.l_i_blocks_high 479 #define i_uid_low i_uid 480 #define i_gid_low i_gid 481 #define i_uid_high osd2.linux2.l_i_uid_high 482 #define i_gid_high osd2.linux2.l_i_gid_high 483 #define i_reserved2 osd2.linux2.l_i_reserved2 484 485 #elif defined(__GNU__) 486 487 #define i_translator osd1.hurd1.h_i_translator 488 #define i_uid_high osd2.hurd2.h_i_uid_high 489 #define i_gid_high osd2.hurd2.h_i_gid_high 490 #define i_author osd2.hurd2.h_i_author 491 492 #elif defined(__masix__) 493 494 #define i_reserved1 osd1.masix1.m_i_reserved1 495 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 496 #define i_reserved2 osd2.masix2.m_i_reserved2 497 498 #endif /* defined(__KERNEL__) || defined(__linux__) */ 499 500 /* 501 * File system states 502 */ 503 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 504 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 505 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 506 507 /* 508 * Misc. filesystem flags 509 */ 510 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 511 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 512 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 513 514 /* 515 * Mount flags 516 */ 517 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 518 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 519 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 520 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 521 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 522 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 523 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 524 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 525 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ 526 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 527 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 528 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 529 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 530 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 531 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 532 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 533 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 534 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */ 535 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 536 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 537 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 538 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 539 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 540 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 541 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 542 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 543 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 544 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 545 546 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ 547 #ifndef _LINUX_EXT2_FS_H 548 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 549 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 550 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 551 EXT4_MOUNT_##opt) 552 #else 553 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD 554 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT 555 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS 556 #endif 557 558 #define ext4_set_bit ext2_set_bit 559 #define ext4_set_bit_atomic ext2_set_bit_atomic 560 #define ext4_clear_bit ext2_clear_bit 561 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 562 #define ext4_test_bit ext2_test_bit 563 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 564 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 565 #define ext4_find_next_bit ext2_find_next_bit 566 567 /* 568 * Maximal mount counts between two filesystem checks 569 */ 570 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 571 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 572 573 /* 574 * Behaviour when detecting errors 575 */ 576 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 577 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 578 #define EXT4_ERRORS_PANIC 3 /* Panic */ 579 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 580 581 /* 582 * Structure of the super block 583 */ 584 struct ext4_super_block { 585 /*00*/ __le32 s_inodes_count; /* Inodes count */ 586 __le32 s_blocks_count_lo; /* Blocks count */ 587 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 588 __le32 s_free_blocks_count_lo; /* Free blocks count */ 589 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 590 __le32 s_first_data_block; /* First Data Block */ 591 __le32 s_log_block_size; /* Block size */ 592 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 593 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 594 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 595 __le32 s_inodes_per_group; /* # Inodes per group */ 596 __le32 s_mtime; /* Mount time */ 597 /*30*/ __le32 s_wtime; /* Write time */ 598 __le16 s_mnt_count; /* Mount count */ 599 __le16 s_max_mnt_count; /* Maximal mount count */ 600 __le16 s_magic; /* Magic signature */ 601 __le16 s_state; /* File system state */ 602 __le16 s_errors; /* Behaviour when detecting errors */ 603 __le16 s_minor_rev_level; /* minor revision level */ 604 /*40*/ __le32 s_lastcheck; /* time of last check */ 605 __le32 s_checkinterval; /* max. time between checks */ 606 __le32 s_creator_os; /* OS */ 607 __le32 s_rev_level; /* Revision level */ 608 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 609 __le16 s_def_resgid; /* Default gid for reserved blocks */ 610 /* 611 * These fields are for EXT4_DYNAMIC_REV superblocks only. 612 * 613 * Note: the difference between the compatible feature set and 614 * the incompatible feature set is that if there is a bit set 615 * in the incompatible feature set that the kernel doesn't 616 * know about, it should refuse to mount the filesystem. 617 * 618 * e2fsck's requirements are more strict; if it doesn't know 619 * about a feature in either the compatible or incompatible 620 * feature set, it must abort and not try to meddle with 621 * things it doesn't understand... 622 */ 623 __le32 s_first_ino; /* First non-reserved inode */ 624 __le16 s_inode_size; /* size of inode structure */ 625 __le16 s_block_group_nr; /* block group # of this superblock */ 626 __le32 s_feature_compat; /* compatible feature set */ 627 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 628 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 629 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 630 /*78*/ char s_volume_name[16]; /* volume name */ 631 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 632 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 633 /* 634 * Performance hints. Directory preallocation should only 635 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 636 */ 637 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 638 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 639 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 640 /* 641 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 642 */ 643 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 644 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 645 __le32 s_journal_dev; /* device number of journal file */ 646 __le32 s_last_orphan; /* start of list of inodes to delete */ 647 __le32 s_hash_seed[4]; /* HTREE hash seed */ 648 __u8 s_def_hash_version; /* Default hash version to use */ 649 __u8 s_reserved_char_pad; 650 __le16 s_desc_size; /* size of group descriptor */ 651 /*100*/ __le32 s_default_mount_opts; 652 __le32 s_first_meta_bg; /* First metablock block group */ 653 __le32 s_mkfs_time; /* When the filesystem was created */ 654 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 655 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 656 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 657 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 658 __le32 s_free_blocks_count_hi; /* Free blocks count */ 659 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 660 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 661 __le32 s_flags; /* Miscellaneous flags */ 662 __le16 s_raid_stride; /* RAID stride */ 663 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 664 __le64 s_mmp_block; /* Block for multi-mount protection */ 665 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 666 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 667 __u8 s_reserved_char_pad2; 668 __le16 s_reserved_pad; 669 __u32 s_reserved[162]; /* Padding to the end of the block */ 670 }; 671 672 #ifdef __KERNEL__ 673 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 674 { 675 return sb->s_fs_info; 676 } 677 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 678 { 679 return container_of(inode, struct ext4_inode_info, vfs_inode); 680 } 681 682 static inline struct timespec ext4_current_time(struct inode *inode) 683 { 684 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 685 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 686 } 687 688 689 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 690 { 691 return ino == EXT4_ROOT_INO || 692 ino == EXT4_JOURNAL_INO || 693 ino == EXT4_RESIZE_INO || 694 (ino >= EXT4_FIRST_INO(sb) && 695 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 696 } 697 #else 698 /* Assume that user mode programs are passing in an ext4fs superblock, not 699 * a kernel struct super_block. This will allow us to call the feature-test 700 * macros from user land. */ 701 #define EXT4_SB(sb) (sb) 702 #endif 703 704 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 705 706 /* 707 * Codes for operating systems 708 */ 709 #define EXT4_OS_LINUX 0 710 #define EXT4_OS_HURD 1 711 #define EXT4_OS_MASIX 2 712 #define EXT4_OS_FREEBSD 3 713 #define EXT4_OS_LITES 4 714 715 /* 716 * Revision levels 717 */ 718 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 719 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 720 721 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 722 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 723 724 #define EXT4_GOOD_OLD_INODE_SIZE 128 725 726 /* 727 * Feature set definitions 728 */ 729 730 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 731 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 732 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 733 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 734 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 735 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 736 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 737 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 738 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 739 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 740 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 741 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 742 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 743 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 744 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 745 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 746 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 747 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 748 749 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 750 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 751 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 752 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 753 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 754 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 755 756 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 757 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 758 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 759 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 760 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 761 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 762 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 763 764 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 765 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 766 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 767 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 768 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 769 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 770 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 771 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 772 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 773 774 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 775 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 776 EXT4_FEATURE_INCOMPAT_RECOVER| \ 777 EXT4_FEATURE_INCOMPAT_META_BG| \ 778 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 779 EXT4_FEATURE_INCOMPAT_64BIT| \ 780 EXT4_FEATURE_INCOMPAT_FLEX_BG) 781 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 782 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 783 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 784 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 785 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 786 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 787 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 788 789 /* 790 * Default values for user and/or group using reserved blocks 791 */ 792 #define EXT4_DEF_RESUID 0 793 #define EXT4_DEF_RESGID 0 794 795 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 796 797 /* 798 * Default mount options 799 */ 800 #define EXT4_DEFM_DEBUG 0x0001 801 #define EXT4_DEFM_BSDGROUPS 0x0002 802 #define EXT4_DEFM_XATTR_USER 0x0004 803 #define EXT4_DEFM_ACL 0x0008 804 #define EXT4_DEFM_UID16 0x0010 805 #define EXT4_DEFM_JMODE 0x0060 806 #define EXT4_DEFM_JMODE_DATA 0x0020 807 #define EXT4_DEFM_JMODE_ORDERED 0x0040 808 #define EXT4_DEFM_JMODE_WBACK 0x0060 809 810 /* 811 * Default journal batch times 812 */ 813 #define EXT4_DEF_MIN_BATCH_TIME 0 814 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 815 816 /* 817 * Structure of a directory entry 818 */ 819 #define EXT4_NAME_LEN 255 820 821 struct ext4_dir_entry { 822 __le32 inode; /* Inode number */ 823 __le16 rec_len; /* Directory entry length */ 824 __le16 name_len; /* Name length */ 825 char name[EXT4_NAME_LEN]; /* File name */ 826 }; 827 828 /* 829 * The new version of the directory entry. Since EXT4 structures are 830 * stored in intel byte order, and the name_len field could never be 831 * bigger than 255 chars, it's safe to reclaim the extra byte for the 832 * file_type field. 833 */ 834 struct ext4_dir_entry_2 { 835 __le32 inode; /* Inode number */ 836 __le16 rec_len; /* Directory entry length */ 837 __u8 name_len; /* Name length */ 838 __u8 file_type; 839 char name[EXT4_NAME_LEN]; /* File name */ 840 }; 841 842 /* 843 * Ext4 directory file types. Only the low 3 bits are used. The 844 * other bits are reserved for now. 845 */ 846 #define EXT4_FT_UNKNOWN 0 847 #define EXT4_FT_REG_FILE 1 848 #define EXT4_FT_DIR 2 849 #define EXT4_FT_CHRDEV 3 850 #define EXT4_FT_BLKDEV 4 851 #define EXT4_FT_FIFO 5 852 #define EXT4_FT_SOCK 6 853 #define EXT4_FT_SYMLINK 7 854 855 #define EXT4_FT_MAX 8 856 857 /* 858 * EXT4_DIR_PAD defines the directory entries boundaries 859 * 860 * NOTE: It must be a multiple of 4 861 */ 862 #define EXT4_DIR_PAD 4 863 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 864 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 865 ~EXT4_DIR_ROUND) 866 #define EXT4_MAX_REC_LEN ((1<<16)-1) 867 868 static inline unsigned ext4_rec_len_from_disk(__le16 dlen) 869 { 870 unsigned len = le16_to_cpu(dlen); 871 872 if (len == EXT4_MAX_REC_LEN || len == 0) 873 return 1 << 16; 874 return len; 875 } 876 877 static inline __le16 ext4_rec_len_to_disk(unsigned len) 878 { 879 if (len == (1 << 16)) 880 return cpu_to_le16(EXT4_MAX_REC_LEN); 881 else if (len > (1 << 16)) 882 BUG(); 883 return cpu_to_le16(len); 884 } 885 886 /* 887 * Hash Tree Directory indexing 888 * (c) Daniel Phillips, 2001 889 */ 890 891 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 892 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 893 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 894 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 895 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 896 897 /* Legal values for the dx_root hash_version field: */ 898 899 #define DX_HASH_LEGACY 0 900 #define DX_HASH_HALF_MD4 1 901 #define DX_HASH_TEA 2 902 #define DX_HASH_LEGACY_UNSIGNED 3 903 #define DX_HASH_HALF_MD4_UNSIGNED 4 904 #define DX_HASH_TEA_UNSIGNED 5 905 906 #ifdef __KERNEL__ 907 908 /* hash info structure used by the directory hash */ 909 struct dx_hash_info 910 { 911 u32 hash; 912 u32 minor_hash; 913 int hash_version; 914 u32 *seed; 915 }; 916 917 #define EXT4_HTREE_EOF 0x7fffffff 918 919 /* 920 * Control parameters used by ext4_htree_next_block 921 */ 922 #define HASH_NB_ALWAYS 1 923 924 925 /* 926 * Describe an inode's exact location on disk and in memory 927 */ 928 struct ext4_iloc 929 { 930 struct buffer_head *bh; 931 unsigned long offset; 932 ext4_group_t block_group; 933 }; 934 935 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 936 { 937 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 938 } 939 940 /* 941 * This structure is stuffed into the struct file's private_data field 942 * for directories. It is where we put information so that we can do 943 * readdir operations in hash tree order. 944 */ 945 struct dir_private_info { 946 struct rb_root root; 947 struct rb_node *curr_node; 948 struct fname *extra_fname; 949 loff_t last_pos; 950 __u32 curr_hash; 951 __u32 curr_minor_hash; 952 __u32 next_hash; 953 }; 954 955 /* calculate the first block number of the group */ 956 static inline ext4_fsblk_t 957 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 958 { 959 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 960 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 961 } 962 963 /* 964 * Special error return code only used by dx_probe() and its callers. 965 */ 966 #define ERR_BAD_DX_DIR -75000 967 968 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 969 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 970 971 extern struct proc_dir_entry *ext4_proc_root; 972 973 #ifdef CONFIG_PROC_FS 974 extern const struct file_operations ext4_ui_proc_fops; 975 976 #define EXT4_PROC_HANDLER(name, var) \ 977 do { \ 978 proc = proc_create_data(name, mode, sbi->s_proc, \ 979 &ext4_ui_proc_fops, &sbi->s_##var); \ 980 if (proc == NULL) { \ 981 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \ 982 goto err_out; \ 983 } \ 984 } while (0) 985 #else 986 #define EXT4_PROC_HANDLER(name, var) 987 #endif 988 989 /* 990 * Function prototypes 991 */ 992 993 /* 994 * Ok, these declarations are also in <linux/kernel.h> but none of the 995 * ext4 source programs needs to include it so they are duplicated here. 996 */ 997 # define NORET_TYPE /**/ 998 # define ATTRIB_NORET __attribute__((noreturn)) 999 # define NORET_AND noreturn, 1000 1001 /* bitmap.c */ 1002 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1003 1004 /* balloc.c */ 1005 extern unsigned int ext4_block_group(struct super_block *sb, 1006 ext4_fsblk_t blocknr); 1007 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1008 ext4_fsblk_t blocknr); 1009 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1010 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1011 ext4_group_t group); 1012 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1013 ext4_fsblk_t goal, unsigned long *count, int *errp); 1014 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1015 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1016 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1017 ext4_fsblk_t block, unsigned long count, int metadata); 1018 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1019 ext4_fsblk_t block, unsigned long count); 1020 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1021 extern void ext4_check_blocks_bitmap(struct super_block *); 1022 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1023 ext4_group_t block_group, 1024 struct buffer_head ** bh); 1025 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1026 1027 /* dir.c */ 1028 extern int ext4_check_dir_entry(const char *, struct inode *, 1029 struct ext4_dir_entry_2 *, 1030 struct buffer_head *, unsigned int); 1031 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1032 __u32 minor_hash, 1033 struct ext4_dir_entry_2 *dirent); 1034 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1035 1036 /* fsync.c */ 1037 extern int ext4_sync_file(struct file *, struct dentry *, int); 1038 1039 /* hash.c */ 1040 extern int ext4fs_dirhash(const char *name, int len, struct 1041 dx_hash_info *hinfo); 1042 1043 /* ialloc.c */ 1044 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int); 1045 extern void ext4_free_inode(handle_t *, struct inode *); 1046 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1047 extern unsigned long ext4_count_free_inodes(struct super_block *); 1048 extern unsigned long ext4_count_dirs(struct super_block *); 1049 extern void ext4_check_inodes_bitmap(struct super_block *); 1050 1051 /* mballoc.c */ 1052 extern long ext4_mb_stats; 1053 extern long ext4_mb_max_to_scan; 1054 extern int ext4_mb_init(struct super_block *, int); 1055 extern int ext4_mb_release(struct super_block *); 1056 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1057 struct ext4_allocation_request *, int *); 1058 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1059 extern void ext4_discard_preallocations(struct inode *); 1060 extern int __init init_ext4_mballoc(void); 1061 extern void exit_ext4_mballoc(void); 1062 extern void ext4_mb_free_blocks(handle_t *, struct inode *, 1063 unsigned long, unsigned long, int, unsigned long *); 1064 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1065 ext4_group_t i, struct ext4_group_desc *desc); 1066 extern void ext4_mb_update_group_info(struct ext4_group_info *grp, 1067 ext4_grpblk_t add); 1068 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1069 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1070 ext4_group_t, int); 1071 /* inode.c */ 1072 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 1073 struct buffer_head *bh, ext4_fsblk_t blocknr); 1074 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1075 ext4_lblk_t, int, int *); 1076 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1077 ext4_lblk_t, int, int *); 1078 int ext4_get_block(struct inode *inode, sector_t iblock, 1079 struct buffer_head *bh_result, int create); 1080 1081 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1082 extern int ext4_write_inode(struct inode *, int); 1083 extern int ext4_setattr(struct dentry *, struct iattr *); 1084 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1085 struct kstat *stat); 1086 extern void ext4_delete_inode(struct inode *); 1087 extern int ext4_sync_inode(handle_t *, struct inode *); 1088 extern void ext4_dirty_inode(struct inode *); 1089 extern int ext4_change_inode_journal_flag(struct inode *, int); 1090 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1091 extern int ext4_can_truncate(struct inode *inode); 1092 extern void ext4_truncate(struct inode *); 1093 extern void ext4_set_inode_flags(struct inode *); 1094 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1095 extern void ext4_set_aops(struct inode *inode); 1096 extern int ext4_writepage_trans_blocks(struct inode *); 1097 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1098 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1099 extern int ext4_block_truncate_page(handle_t *handle, 1100 struct address_space *mapping, loff_t from); 1101 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page); 1102 extern qsize_t ext4_get_reserved_space(struct inode *inode); 1103 1104 /* ioctl.c */ 1105 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1106 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1107 1108 /* migrate.c */ 1109 extern int ext4_ext_migrate(struct inode *); 1110 /* namei.c */ 1111 extern int ext4_orphan_add(handle_t *, struct inode *); 1112 extern int ext4_orphan_del(handle_t *, struct inode *); 1113 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1114 __u32 start_minor_hash, __u32 *next_hash); 1115 1116 /* resize.c */ 1117 extern int ext4_group_add(struct super_block *sb, 1118 struct ext4_new_group_data *input); 1119 extern int ext4_group_extend(struct super_block *sb, 1120 struct ext4_super_block *es, 1121 ext4_fsblk_t n_blocks_count); 1122 1123 /* super.c */ 1124 extern void ext4_error(struct super_block *, const char *, const char *, ...) 1125 __attribute__ ((format (printf, 3, 4))); 1126 extern void __ext4_std_error(struct super_block *, const char *, int); 1127 extern void ext4_abort(struct super_block *, const char *, const char *, ...) 1128 __attribute__ ((format (printf, 3, 4))); 1129 extern void ext4_warning(struct super_block *, const char *, const char *, ...) 1130 __attribute__ ((format (printf, 3, 4))); 1131 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 1132 const char *, const char *, ...) 1133 __attribute__ ((format (printf, 4, 5))); 1134 extern void ext4_update_dynamic_rev(struct super_block *sb); 1135 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1136 __u32 compat); 1137 extern int ext4_update_rocompat_feature(handle_t *handle, 1138 struct super_block *sb, __u32 rocompat); 1139 extern int ext4_update_incompat_feature(handle_t *handle, 1140 struct super_block *sb, __u32 incompat); 1141 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1142 struct ext4_group_desc *bg); 1143 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1144 struct ext4_group_desc *bg); 1145 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1146 struct ext4_group_desc *bg); 1147 extern __u32 ext4_free_blks_count(struct super_block *sb, 1148 struct ext4_group_desc *bg); 1149 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1150 struct ext4_group_desc *bg); 1151 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1152 struct ext4_group_desc *bg); 1153 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1154 struct ext4_group_desc *bg); 1155 extern void ext4_block_bitmap_set(struct super_block *sb, 1156 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1157 extern void ext4_inode_bitmap_set(struct super_block *sb, 1158 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1159 extern void ext4_inode_table_set(struct super_block *sb, 1160 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1161 extern void ext4_free_blks_set(struct super_block *sb, 1162 struct ext4_group_desc *bg, __u32 count); 1163 extern void ext4_free_inodes_set(struct super_block *sb, 1164 struct ext4_group_desc *bg, __u32 count); 1165 extern void ext4_used_dirs_set(struct super_block *sb, 1166 struct ext4_group_desc *bg, __u32 count); 1167 extern void ext4_itable_unused_set(struct super_block *sb, 1168 struct ext4_group_desc *bg, __u32 count); 1169 1170 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1171 { 1172 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1173 le32_to_cpu(es->s_blocks_count_lo); 1174 } 1175 1176 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1177 { 1178 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1179 le32_to_cpu(es->s_r_blocks_count_lo); 1180 } 1181 1182 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1183 { 1184 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1185 le32_to_cpu(es->s_free_blocks_count_lo); 1186 } 1187 1188 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1189 ext4_fsblk_t blk) 1190 { 1191 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1192 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1193 } 1194 1195 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1196 ext4_fsblk_t blk) 1197 { 1198 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1199 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1200 } 1201 1202 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1203 ext4_fsblk_t blk) 1204 { 1205 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1206 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1207 } 1208 1209 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1210 { 1211 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1212 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1213 le32_to_cpu(raw_inode->i_size_lo); 1214 else 1215 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1216 } 1217 1218 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1219 { 1220 raw_inode->i_size_lo = cpu_to_le32(i_size); 1221 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1222 } 1223 1224 static inline 1225 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1226 ext4_group_t group) 1227 { 1228 struct ext4_group_info ***grp_info; 1229 long indexv, indexh; 1230 grp_info = EXT4_SB(sb)->s_group_info; 1231 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1232 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1233 return grp_info[indexv][indexh]; 1234 } 1235 1236 1237 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1238 ext4_group_t block_group) 1239 { 1240 return block_group >> sbi->s_log_groups_per_flex; 1241 } 1242 1243 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1244 { 1245 return 1 << sbi->s_log_groups_per_flex; 1246 } 1247 1248 #define ext4_std_error(sb, errno) \ 1249 do { \ 1250 if ((errno)) \ 1251 __ext4_std_error((sb), __func__, (errno)); \ 1252 } while (0) 1253 1254 #ifdef CONFIG_SMP 1255 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1256 * counters. So we need to make sure we have free blocks more 1257 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1258 */ 1259 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1260 #else 1261 #define EXT4_FREEBLOCKS_WATERMARK 0 1262 #endif 1263 1264 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1265 { 1266 /* 1267 * XXX: replace with spinlock if seen contended -bzzz 1268 */ 1269 down_write(&EXT4_I(inode)->i_data_sem); 1270 if (newsize > EXT4_I(inode)->i_disksize) 1271 EXT4_I(inode)->i_disksize = newsize; 1272 up_write(&EXT4_I(inode)->i_data_sem); 1273 return ; 1274 } 1275 1276 struct ext4_group_info { 1277 unsigned long bb_state; 1278 struct rb_root bb_free_root; 1279 unsigned short bb_first_free; 1280 unsigned short bb_free; 1281 unsigned short bb_fragments; 1282 struct list_head bb_prealloc_list; 1283 #ifdef DOUBLE_CHECK 1284 void *bb_bitmap; 1285 #endif 1286 struct rw_semaphore alloc_sem; 1287 unsigned short bb_counters[]; 1288 }; 1289 1290 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1291 #define EXT4_GROUP_INFO_LOCKED_BIT 1 1292 1293 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1294 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1295 1296 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1297 { 1298 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1299 1300 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); 1301 } 1302 1303 static inline void ext4_unlock_group(struct super_block *sb, 1304 ext4_group_t group) 1305 { 1306 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1307 1308 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); 1309 } 1310 1311 static inline int ext4_is_group_locked(struct super_block *sb, 1312 ext4_group_t group) 1313 { 1314 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1315 1316 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT, 1317 &(grinfo->bb_state)); 1318 } 1319 1320 /* 1321 * Inodes and files operations 1322 */ 1323 1324 /* dir.c */ 1325 extern const struct file_operations ext4_dir_operations; 1326 1327 /* file.c */ 1328 extern const struct inode_operations ext4_file_inode_operations; 1329 extern const struct file_operations ext4_file_operations; 1330 1331 /* namei.c */ 1332 extern const struct inode_operations ext4_dir_inode_operations; 1333 extern const struct inode_operations ext4_special_inode_operations; 1334 1335 /* symlink.c */ 1336 extern const struct inode_operations ext4_symlink_inode_operations; 1337 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1338 1339 /* extents.c */ 1340 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1341 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1342 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1343 int chunk); 1344 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1345 ext4_lblk_t iblock, unsigned int max_blocks, 1346 struct buffer_head *bh_result, 1347 int create, int extend_disksize); 1348 extern void ext4_ext_truncate(struct inode *); 1349 extern void ext4_ext_init(struct super_block *); 1350 extern void ext4_ext_release(struct super_block *); 1351 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1352 loff_t len); 1353 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, 1354 sector_t block, unsigned int max_blocks, 1355 struct buffer_head *bh, int create, 1356 int extend_disksize, int flag); 1357 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1358 __u64 start, __u64 len); 1359 1360 /* 1361 * Add new method to test wether block and inode bitmaps are properly 1362 * initialized. With uninit_bg reading the block from disk is not enough 1363 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1364 */ 1365 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1366 1367 static inline int bitmap_uptodate(struct buffer_head *bh) 1368 { 1369 return (buffer_uptodate(bh) && 1370 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1371 } 1372 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1373 { 1374 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1375 } 1376 1377 #endif /* __KERNEL__ */ 1378 1379 #endif /* _EXT4_H */ 1380