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 "ext4_i.h" 23 24 /* 25 * The second extended filesystem constants/structures 26 */ 27 28 /* 29 * Define EXT4FS_DEBUG to produce debug messages 30 */ 31 #undef EXT4FS_DEBUG 32 33 /* 34 * Define EXT4_RESERVATION to reserve data blocks for expanding files 35 */ 36 #define EXT4_DEFAULT_RESERVE_BLOCKS 8 37 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 38 #define EXT4_MAX_RESERVE_BLOCKS 1027 39 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0 40 41 /* 42 * Debug code 43 */ 44 #ifdef EXT4FS_DEBUG 45 #define ext4_debug(f, a...) \ 46 do { \ 47 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 48 __FILE__, __LINE__, __FUNCTION__); \ 49 printk (KERN_DEBUG f, ## a); \ 50 } while (0) 51 #else 52 #define ext4_debug(f, a...) do {} while (0) 53 #endif 54 55 #define EXT4_MULTIBLOCK_ALLOCATOR 1 56 57 /* prefer goal again. length */ 58 #define EXT4_MB_HINT_MERGE 1 59 /* blocks already reserved */ 60 #define EXT4_MB_HINT_RESERVED 2 61 /* metadata is being allocated */ 62 #define EXT4_MB_HINT_METADATA 4 63 /* first blocks in the file */ 64 #define EXT4_MB_HINT_FIRST 8 65 /* search for the best chunk */ 66 #define EXT4_MB_HINT_BEST 16 67 /* data is being allocated */ 68 #define EXT4_MB_HINT_DATA 32 69 /* don't preallocate (for tails) */ 70 #define EXT4_MB_HINT_NOPREALLOC 64 71 /* allocate for locality group */ 72 #define EXT4_MB_HINT_GROUP_ALLOC 128 73 /* allocate goal blocks or none */ 74 #define EXT4_MB_HINT_GOAL_ONLY 256 75 /* goal is meaningful */ 76 #define EXT4_MB_HINT_TRY_GOAL 512 77 78 struct ext4_allocation_request { 79 /* target inode for block we're allocating */ 80 struct inode *inode; 81 /* logical block in target inode */ 82 ext4_lblk_t logical; 83 /* phys. target (a hint) */ 84 ext4_fsblk_t goal; 85 /* the closest logical allocated block to the left */ 86 ext4_lblk_t lleft; 87 /* phys. block for ^^^ */ 88 ext4_fsblk_t pleft; 89 /* the closest logical allocated block to the right */ 90 ext4_lblk_t lright; 91 /* phys. block for ^^^ */ 92 ext4_fsblk_t pright; 93 /* how many blocks we want to allocate */ 94 unsigned long len; 95 /* flags. see above EXT4_MB_HINT_* */ 96 unsigned long flags; 97 }; 98 99 /* 100 * Special inodes numbers 101 */ 102 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 103 #define EXT4_ROOT_INO 2 /* Root inode */ 104 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 105 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 106 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 107 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 108 109 /* First non-reserved inode for old ext4 filesystems */ 110 #define EXT4_GOOD_OLD_FIRST_INO 11 111 112 /* 113 * Maximal count of links to a file 114 */ 115 #define EXT4_LINK_MAX 65000 116 117 /* 118 * Macro-instructions used to manage several block sizes 119 */ 120 #define EXT4_MIN_BLOCK_SIZE 1024 121 #define EXT4_MAX_BLOCK_SIZE 65536 122 #define EXT4_MIN_BLOCK_LOG_SIZE 10 123 #ifdef __KERNEL__ 124 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 125 #else 126 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 127 #endif 128 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32)) 129 #ifdef __KERNEL__ 130 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 131 #else 132 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 133 #endif 134 #ifdef __KERNEL__ 135 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 136 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 137 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 138 #else 139 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 140 EXT4_GOOD_OLD_INODE_SIZE : \ 141 (s)->s_inode_size) 142 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 143 EXT4_GOOD_OLD_FIRST_INO : \ 144 (s)->s_first_ino) 145 #endif 146 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 147 148 /* 149 * Structure of a blocks group descriptor 150 */ 151 struct ext4_group_desc 152 { 153 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 154 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 155 __le32 bg_inode_table_lo; /* Inodes table block */ 156 __le16 bg_free_blocks_count; /* Free blocks count */ 157 __le16 bg_free_inodes_count; /* Free inodes count */ 158 __le16 bg_used_dirs_count; /* Directories count */ 159 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 160 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 161 __le16 bg_itable_unused; /* Unused inodes count */ 162 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 163 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 164 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 165 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 166 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 167 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 168 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 169 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 170 __u32 bg_reserved2[3]; 171 }; 172 173 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 174 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 175 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 176 177 #ifdef __KERNEL__ 178 #include "ext4_sb.h" 179 #endif 180 /* 181 * Macro-instructions used to manage group descriptors 182 */ 183 #define EXT4_MIN_DESC_SIZE 32 184 #define EXT4_MIN_DESC_SIZE_64BIT 64 185 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 186 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 187 #ifdef __KERNEL__ 188 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 189 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 190 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 191 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 192 #else 193 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 194 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 195 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 196 #endif 197 198 /* 199 * Constants relative to the data blocks 200 */ 201 #define EXT4_NDIR_BLOCKS 12 202 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 203 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 204 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 205 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 206 207 /* 208 * Inode flags 209 */ 210 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 211 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 212 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 213 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 214 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 215 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 216 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 217 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 218 /* Reserved for compression usage... */ 219 #define EXT4_DIRTY_FL 0x00000100 220 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 221 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 222 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 223 /* End compression flags --- maybe not all used */ 224 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 225 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 226 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 227 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 228 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 229 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 230 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 231 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 232 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ 233 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 234 235 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 236 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 237 238 /* 239 * Inode dynamic state flags 240 */ 241 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 242 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 243 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 244 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 245 246 /* Used to pass group descriptor data when online resize is done */ 247 struct ext4_new_group_input { 248 __u32 group; /* Group number for this data */ 249 __u64 block_bitmap; /* Absolute block number of block bitmap */ 250 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 251 __u64 inode_table; /* Absolute block number of inode table start */ 252 __u32 blocks_count; /* Total number of blocks in this group */ 253 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 254 __u16 unused; 255 }; 256 257 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 258 struct ext4_new_group_data { 259 __u32 group; 260 __u64 block_bitmap; 261 __u64 inode_bitmap; 262 __u64 inode_table; 263 __u32 blocks_count; 264 __u16 reserved_blocks; 265 __u16 unused; 266 __u32 free_blocks_count; 267 }; 268 269 /* 270 * Following is used by preallocation code to tell get_blocks() that we 271 * want uninitialzed extents. 272 */ 273 #define EXT4_CREATE_UNINITIALIZED_EXT 2 274 275 /* 276 * ioctl commands 277 */ 278 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 279 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 280 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 281 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 282 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 283 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 284 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 285 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 286 #ifdef CONFIG_JBD2_DEBUG 287 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 288 #endif 289 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 290 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 291 #define EXT4_IOC_MIGRATE _IO('f', 7) 292 293 /* 294 * ioctl commands in 32 bit emulation 295 */ 296 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 297 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 298 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 299 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 300 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 301 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 302 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 303 #ifdef CONFIG_JBD2_DEBUG 304 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 305 #endif 306 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 307 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 308 309 310 /* 311 * Mount options 312 */ 313 struct ext4_mount_options { 314 unsigned long s_mount_opt; 315 uid_t s_resuid; 316 gid_t s_resgid; 317 unsigned long s_commit_interval; 318 #ifdef CONFIG_QUOTA 319 int s_jquota_fmt; 320 char *s_qf_names[MAXQUOTAS]; 321 #endif 322 }; 323 324 /* 325 * Structure of an inode on the disk 326 */ 327 struct ext4_inode { 328 __le16 i_mode; /* File mode */ 329 __le16 i_uid; /* Low 16 bits of Owner Uid */ 330 __le32 i_size_lo; /* Size in bytes */ 331 __le32 i_atime; /* Access time */ 332 __le32 i_ctime; /* Inode Change time */ 333 __le32 i_mtime; /* Modification time */ 334 __le32 i_dtime; /* Deletion Time */ 335 __le16 i_gid; /* Low 16 bits of Group Id */ 336 __le16 i_links_count; /* Links count */ 337 __le32 i_blocks_lo; /* Blocks count */ 338 __le32 i_flags; /* File flags */ 339 union { 340 struct { 341 __le32 l_i_version; 342 } linux1; 343 struct { 344 __u32 h_i_translator; 345 } hurd1; 346 struct { 347 __u32 m_i_reserved1; 348 } masix1; 349 } osd1; /* OS dependent 1 */ 350 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 351 __le32 i_generation; /* File version (for NFS) */ 352 __le32 i_file_acl_lo; /* File ACL */ 353 __le32 i_size_high; 354 __le32 i_obso_faddr; /* Obsoleted fragment address */ 355 union { 356 struct { 357 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 358 __le16 l_i_file_acl_high; 359 __le16 l_i_uid_high; /* these 2 fields */ 360 __le16 l_i_gid_high; /* were reserved2[0] */ 361 __u32 l_i_reserved2; 362 } linux2; 363 struct { 364 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 365 __u16 h_i_mode_high; 366 __u16 h_i_uid_high; 367 __u16 h_i_gid_high; 368 __u32 h_i_author; 369 } hurd2; 370 struct { 371 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 372 __le16 m_i_file_acl_high; 373 __u32 m_i_reserved2[2]; 374 } masix2; 375 } osd2; /* OS dependent 2 */ 376 __le16 i_extra_isize; 377 __le16 i_pad1; 378 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 379 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 380 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 381 __le32 i_crtime; /* File Creation time */ 382 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 383 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 384 }; 385 386 387 #define EXT4_EPOCH_BITS 2 388 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 389 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 390 391 /* 392 * Extended fields will fit into an inode if the filesystem was formatted 393 * with large inodes (-I 256 or larger) and there are not currently any EAs 394 * consuming all of the available space. For new inodes we always reserve 395 * enough space for the kernel's known extended fields, but for inodes 396 * created with an old kernel this might not have been the case. None of 397 * the extended inode fields is critical for correct filesystem operation. 398 * This macro checks if a certain field fits in the inode. Note that 399 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 400 */ 401 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 402 ((offsetof(typeof(*ext4_inode), field) + \ 403 sizeof((ext4_inode)->field)) \ 404 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 405 (einode)->i_extra_isize)) \ 406 407 static inline __le32 ext4_encode_extra_time(struct timespec *time) 408 { 409 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 410 time->tv_sec >> 32 : 0) | 411 ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 412 } 413 414 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 415 { 416 if (sizeof(time->tv_sec) > 4) 417 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 418 << 32; 419 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 420 } 421 422 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 423 do { \ 424 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 425 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 426 (raw_inode)->xtime ## _extra = \ 427 ext4_encode_extra_time(&(inode)->xtime); \ 428 } while (0) 429 430 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 431 do { \ 432 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 433 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 434 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 435 (raw_inode)->xtime ## _extra = \ 436 ext4_encode_extra_time(&(einode)->xtime); \ 437 } while (0) 438 439 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 440 do { \ 441 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 442 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 443 ext4_decode_extra_time(&(inode)->xtime, \ 444 raw_inode->xtime ## _extra); \ 445 } while (0) 446 447 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 448 do { \ 449 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 450 (einode)->xtime.tv_sec = \ 451 (signed)le32_to_cpu((raw_inode)->xtime); \ 452 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 453 ext4_decode_extra_time(&(einode)->xtime, \ 454 raw_inode->xtime ## _extra); \ 455 } while (0) 456 457 #define i_disk_version osd1.linux1.l_i_version 458 459 #if defined(__KERNEL__) || defined(__linux__) 460 #define i_reserved1 osd1.linux1.l_i_reserved1 461 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 462 #define i_blocks_high osd2.linux2.l_i_blocks_high 463 #define i_uid_low i_uid 464 #define i_gid_low i_gid 465 #define i_uid_high osd2.linux2.l_i_uid_high 466 #define i_gid_high osd2.linux2.l_i_gid_high 467 #define i_reserved2 osd2.linux2.l_i_reserved2 468 469 #elif defined(__GNU__) 470 471 #define i_translator osd1.hurd1.h_i_translator 472 #define i_uid_high osd2.hurd2.h_i_uid_high 473 #define i_gid_high osd2.hurd2.h_i_gid_high 474 #define i_author osd2.hurd2.h_i_author 475 476 #elif defined(__masix__) 477 478 #define i_reserved1 osd1.masix1.m_i_reserved1 479 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 480 #define i_reserved2 osd2.masix2.m_i_reserved2 481 482 #endif /* defined(__KERNEL__) || defined(__linux__) */ 483 484 /* 485 * File system states 486 */ 487 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 488 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 489 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 490 491 /* 492 * Misc. filesystem flags 493 */ 494 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 495 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 496 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 497 498 /* 499 * Mount flags 500 */ 501 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */ 502 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 503 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 504 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 505 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 506 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 507 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 508 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 509 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 510 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ 511 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 512 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 513 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 514 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 515 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 516 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 517 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 518 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 519 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */ 520 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 521 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 522 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 523 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 524 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 525 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */ 526 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 527 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 528 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 529 #define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */ 530 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ 531 #ifndef _LINUX_EXT2_FS_H 532 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 533 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 534 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 535 EXT4_MOUNT_##opt) 536 #else 537 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD 538 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT 539 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS 540 #endif 541 542 #define ext4_set_bit ext2_set_bit 543 #define ext4_set_bit_atomic ext2_set_bit_atomic 544 #define ext4_clear_bit ext2_clear_bit 545 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 546 #define ext4_test_bit ext2_test_bit 547 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 548 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 549 #define ext4_find_next_bit ext2_find_next_bit 550 551 /* 552 * Maximal mount counts between two filesystem checks 553 */ 554 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 555 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 556 557 /* 558 * Behaviour when detecting errors 559 */ 560 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 561 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 562 #define EXT4_ERRORS_PANIC 3 /* Panic */ 563 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 564 565 /* 566 * Structure of the super block 567 */ 568 struct ext4_super_block { 569 /*00*/ __le32 s_inodes_count; /* Inodes count */ 570 __le32 s_blocks_count_lo; /* Blocks count */ 571 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 572 __le32 s_free_blocks_count_lo; /* Free blocks count */ 573 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 574 __le32 s_first_data_block; /* First Data Block */ 575 __le32 s_log_block_size; /* Block size */ 576 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 577 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 578 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 579 __le32 s_inodes_per_group; /* # Inodes per group */ 580 __le32 s_mtime; /* Mount time */ 581 /*30*/ __le32 s_wtime; /* Write time */ 582 __le16 s_mnt_count; /* Mount count */ 583 __le16 s_max_mnt_count; /* Maximal mount count */ 584 __le16 s_magic; /* Magic signature */ 585 __le16 s_state; /* File system state */ 586 __le16 s_errors; /* Behaviour when detecting errors */ 587 __le16 s_minor_rev_level; /* minor revision level */ 588 /*40*/ __le32 s_lastcheck; /* time of last check */ 589 __le32 s_checkinterval; /* max. time between checks */ 590 __le32 s_creator_os; /* OS */ 591 __le32 s_rev_level; /* Revision level */ 592 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 593 __le16 s_def_resgid; /* Default gid for reserved blocks */ 594 /* 595 * These fields are for EXT4_DYNAMIC_REV superblocks only. 596 * 597 * Note: the difference between the compatible feature set and 598 * the incompatible feature set is that if there is a bit set 599 * in the incompatible feature set that the kernel doesn't 600 * know about, it should refuse to mount the filesystem. 601 * 602 * e2fsck's requirements are more strict; if it doesn't know 603 * about a feature in either the compatible or incompatible 604 * feature set, it must abort and not try to meddle with 605 * things it doesn't understand... 606 */ 607 __le32 s_first_ino; /* First non-reserved inode */ 608 __le16 s_inode_size; /* size of inode structure */ 609 __le16 s_block_group_nr; /* block group # of this superblock */ 610 __le32 s_feature_compat; /* compatible feature set */ 611 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 612 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 613 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 614 /*78*/ char s_volume_name[16]; /* volume name */ 615 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 616 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 617 /* 618 * Performance hints. Directory preallocation should only 619 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 620 */ 621 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 622 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 623 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 624 /* 625 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 626 */ 627 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 628 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 629 __le32 s_journal_dev; /* device number of journal file */ 630 __le32 s_last_orphan; /* start of list of inodes to delete */ 631 __le32 s_hash_seed[4]; /* HTREE hash seed */ 632 __u8 s_def_hash_version; /* Default hash version to use */ 633 __u8 s_reserved_char_pad; 634 __le16 s_desc_size; /* size of group descriptor */ 635 /*100*/ __le32 s_default_mount_opts; 636 __le32 s_first_meta_bg; /* First metablock block group */ 637 __le32 s_mkfs_time; /* When the filesystem was created */ 638 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 639 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 640 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 641 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 642 __le32 s_free_blocks_count_hi; /* Free blocks count */ 643 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 644 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 645 __le32 s_flags; /* Miscellaneous flags */ 646 __le16 s_raid_stride; /* RAID stride */ 647 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 648 __le64 s_mmp_block; /* Block for multi-mount protection */ 649 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 650 __u32 s_reserved[163]; /* Padding to the end of the block */ 651 }; 652 653 #ifdef __KERNEL__ 654 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb) 655 { 656 return sb->s_fs_info; 657 } 658 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 659 { 660 return container_of(inode, struct ext4_inode_info, vfs_inode); 661 } 662 663 static inline struct timespec ext4_current_time(struct inode *inode) 664 { 665 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 666 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 667 } 668 669 670 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 671 { 672 return ino == EXT4_ROOT_INO || 673 ino == EXT4_JOURNAL_INO || 674 ino == EXT4_RESIZE_INO || 675 (ino >= EXT4_FIRST_INO(sb) && 676 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 677 } 678 #else 679 /* Assume that user mode programs are passing in an ext4fs superblock, not 680 * a kernel struct super_block. This will allow us to call the feature-test 681 * macros from user land. */ 682 #define EXT4_SB(sb) (sb) 683 #endif 684 685 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 686 687 /* 688 * Codes for operating systems 689 */ 690 #define EXT4_OS_LINUX 0 691 #define EXT4_OS_HURD 1 692 #define EXT4_OS_MASIX 2 693 #define EXT4_OS_FREEBSD 3 694 #define EXT4_OS_LITES 4 695 696 /* 697 * Revision levels 698 */ 699 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 700 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 701 702 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 703 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 704 705 #define EXT4_GOOD_OLD_INODE_SIZE 128 706 707 /* 708 * Feature set definitions 709 */ 710 711 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 712 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 713 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 714 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 715 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 716 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 717 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 718 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 719 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 720 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 721 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 722 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 723 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 724 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 725 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 726 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 727 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 728 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 729 730 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 731 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 732 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 733 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 734 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 735 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 736 737 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 738 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 739 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 740 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 741 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 742 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 743 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 744 745 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 746 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 747 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 748 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 749 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 750 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 751 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 752 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 753 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 754 755 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 756 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 757 EXT4_FEATURE_INCOMPAT_RECOVER| \ 758 EXT4_FEATURE_INCOMPAT_META_BG| \ 759 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 760 EXT4_FEATURE_INCOMPAT_64BIT| \ 761 EXT4_FEATURE_INCOMPAT_FLEX_BG) 762 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 763 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 764 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 765 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 766 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 767 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 768 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 769 770 /* 771 * Default values for user and/or group using reserved blocks 772 */ 773 #define EXT4_DEF_RESUID 0 774 #define EXT4_DEF_RESGID 0 775 776 /* 777 * Default mount options 778 */ 779 #define EXT4_DEFM_DEBUG 0x0001 780 #define EXT4_DEFM_BSDGROUPS 0x0002 781 #define EXT4_DEFM_XATTR_USER 0x0004 782 #define EXT4_DEFM_ACL 0x0008 783 #define EXT4_DEFM_UID16 0x0010 784 #define EXT4_DEFM_JMODE 0x0060 785 #define EXT4_DEFM_JMODE_DATA 0x0020 786 #define EXT4_DEFM_JMODE_ORDERED 0x0040 787 #define EXT4_DEFM_JMODE_WBACK 0x0060 788 789 /* 790 * Structure of a directory entry 791 */ 792 #define EXT4_NAME_LEN 255 793 794 struct ext4_dir_entry { 795 __le32 inode; /* Inode number */ 796 __le16 rec_len; /* Directory entry length */ 797 __le16 name_len; /* Name length */ 798 char name[EXT4_NAME_LEN]; /* File name */ 799 }; 800 801 /* 802 * The new version of the directory entry. Since EXT4 structures are 803 * stored in intel byte order, and the name_len field could never be 804 * bigger than 255 chars, it's safe to reclaim the extra byte for the 805 * file_type field. 806 */ 807 struct ext4_dir_entry_2 { 808 __le32 inode; /* Inode number */ 809 __le16 rec_len; /* Directory entry length */ 810 __u8 name_len; /* Name length */ 811 __u8 file_type; 812 char name[EXT4_NAME_LEN]; /* File name */ 813 }; 814 815 /* 816 * Ext4 directory file types. Only the low 3 bits are used. The 817 * other bits are reserved for now. 818 */ 819 #define EXT4_FT_UNKNOWN 0 820 #define EXT4_FT_REG_FILE 1 821 #define EXT4_FT_DIR 2 822 #define EXT4_FT_CHRDEV 3 823 #define EXT4_FT_BLKDEV 4 824 #define EXT4_FT_FIFO 5 825 #define EXT4_FT_SOCK 6 826 #define EXT4_FT_SYMLINK 7 827 828 #define EXT4_FT_MAX 8 829 830 /* 831 * EXT4_DIR_PAD defines the directory entries boundaries 832 * 833 * NOTE: It must be a multiple of 4 834 */ 835 #define EXT4_DIR_PAD 4 836 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 837 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 838 ~EXT4_DIR_ROUND) 839 #define EXT4_MAX_REC_LEN ((1<<16)-1) 840 841 static inline unsigned ext4_rec_len_from_disk(__le16 dlen) 842 { 843 unsigned len = le16_to_cpu(dlen); 844 845 if (len == EXT4_MAX_REC_LEN) 846 return 1 << 16; 847 return len; 848 } 849 850 static inline __le16 ext4_rec_len_to_disk(unsigned len) 851 { 852 if (len == (1 << 16)) 853 return cpu_to_le16(EXT4_MAX_REC_LEN); 854 else if (len > (1 << 16)) 855 BUG(); 856 return cpu_to_le16(len); 857 } 858 859 /* 860 * Hash Tree Directory indexing 861 * (c) Daniel Phillips, 2001 862 */ 863 864 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 865 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 866 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 867 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 868 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 869 870 /* Legal values for the dx_root hash_version field: */ 871 872 #define DX_HASH_LEGACY 0 873 #define DX_HASH_HALF_MD4 1 874 #define DX_HASH_TEA 2 875 876 #ifdef __KERNEL__ 877 878 /* hash info structure used by the directory hash */ 879 struct dx_hash_info 880 { 881 u32 hash; 882 u32 minor_hash; 883 int hash_version; 884 u32 *seed; 885 }; 886 887 #define EXT4_HTREE_EOF 0x7fffffff 888 889 /* 890 * Control parameters used by ext4_htree_next_block 891 */ 892 #define HASH_NB_ALWAYS 1 893 894 895 /* 896 * Describe an inode's exact location on disk and in memory 897 */ 898 struct ext4_iloc 899 { 900 struct buffer_head *bh; 901 unsigned long offset; 902 ext4_group_t block_group; 903 }; 904 905 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 906 { 907 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 908 } 909 910 /* 911 * This structure is stuffed into the struct file's private_data field 912 * for directories. It is where we put information so that we can do 913 * readdir operations in hash tree order. 914 */ 915 struct dir_private_info { 916 struct rb_root root; 917 struct rb_node *curr_node; 918 struct fname *extra_fname; 919 loff_t last_pos; 920 __u32 curr_hash; 921 __u32 curr_minor_hash; 922 __u32 next_hash; 923 }; 924 925 /* calculate the first block number of the group */ 926 static inline ext4_fsblk_t 927 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 928 { 929 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 930 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 931 } 932 933 /* 934 * Special error return code only used by dx_probe() and its callers. 935 */ 936 #define ERR_BAD_DX_DIR -75000 937 938 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 939 unsigned long *blockgrpp, ext4_grpblk_t *offsetp); 940 941 /* 942 * Function prototypes 943 */ 944 945 /* 946 * Ok, these declarations are also in <linux/kernel.h> but none of the 947 * ext4 source programs needs to include it so they are duplicated here. 948 */ 949 # define NORET_TYPE /**/ 950 # define ATTRIB_NORET __attribute__((noreturn)) 951 # define NORET_AND noreturn, 952 953 /* balloc.c */ 954 extern unsigned int ext4_block_group(struct super_block *sb, 955 ext4_fsblk_t blocknr); 956 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 957 ext4_fsblk_t blocknr); 958 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 959 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 960 ext4_group_t group); 961 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode, 962 ext4_fsblk_t goal, int *errp); 963 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode, 964 ext4_fsblk_t goal, unsigned long *count, int *errp); 965 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode, 966 ext4_fsblk_t goal, unsigned long *count, int *errp); 967 extern void ext4_free_blocks (handle_t *handle, struct inode *inode, 968 ext4_fsblk_t block, unsigned long count, int metadata); 969 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb, 970 ext4_fsblk_t block, unsigned long count, 971 unsigned long *pdquot_freed_blocks); 972 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *); 973 extern void ext4_check_blocks_bitmap (struct super_block *); 974 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 975 ext4_group_t block_group, 976 struct buffer_head ** bh); 977 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 978 extern void ext4_init_block_alloc_info(struct inode *); 979 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv); 980 981 /* dir.c */ 982 extern int ext4_check_dir_entry(const char *, struct inode *, 983 struct ext4_dir_entry_2 *, 984 struct buffer_head *, unsigned long); 985 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 986 __u32 minor_hash, 987 struct ext4_dir_entry_2 *dirent); 988 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 989 990 /* fsync.c */ 991 extern int ext4_sync_file (struct file *, struct dentry *, int); 992 993 /* hash.c */ 994 extern int ext4fs_dirhash(const char *name, int len, struct 995 dx_hash_info *hinfo); 996 997 /* ialloc.c */ 998 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int); 999 extern void ext4_free_inode (handle_t *, struct inode *); 1000 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long); 1001 extern unsigned long ext4_count_free_inodes (struct super_block *); 1002 extern unsigned long ext4_count_dirs (struct super_block *); 1003 extern void ext4_check_inodes_bitmap (struct super_block *); 1004 extern unsigned long ext4_count_free (struct buffer_head *, unsigned); 1005 1006 /* mballoc.c */ 1007 extern long ext4_mb_stats; 1008 extern long ext4_mb_max_to_scan; 1009 extern int ext4_mb_init(struct super_block *, int); 1010 extern int ext4_mb_release(struct super_block *); 1011 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1012 struct ext4_allocation_request *, int *); 1013 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1014 extern void ext4_mb_discard_inode_preallocations(struct inode *); 1015 extern int __init init_ext4_mballoc(void); 1016 extern void exit_ext4_mballoc(void); 1017 extern void ext4_mb_free_blocks(handle_t *, struct inode *, 1018 unsigned long, unsigned long, int, unsigned long *); 1019 1020 1021 /* inode.c */ 1022 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 1023 struct buffer_head *bh, ext4_fsblk_t blocknr); 1024 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1025 ext4_lblk_t, int, int *); 1026 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1027 ext4_lblk_t, int, int *); 1028 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode, 1029 ext4_lblk_t iblock, unsigned long maxblocks, 1030 struct buffer_head *bh_result, 1031 int create, int extend_disksize); 1032 1033 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1034 extern int ext4_write_inode (struct inode *, int); 1035 extern int ext4_setattr (struct dentry *, struct iattr *); 1036 extern void ext4_delete_inode (struct inode *); 1037 extern int ext4_sync_inode (handle_t *, struct inode *); 1038 extern void ext4_discard_reservation (struct inode *); 1039 extern void ext4_dirty_inode(struct inode *); 1040 extern int ext4_change_inode_journal_flag(struct inode *, int); 1041 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1042 extern int ext4_can_truncate(struct inode *inode); 1043 extern void ext4_truncate (struct inode *); 1044 extern void ext4_set_inode_flags(struct inode *); 1045 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1046 extern void ext4_set_aops(struct inode *inode); 1047 extern int ext4_writepage_trans_blocks(struct inode *); 1048 extern int ext4_block_truncate_page(handle_t *handle, struct page *page, 1049 struct address_space *mapping, loff_t from); 1050 1051 /* ioctl.c */ 1052 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1053 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long); 1054 1055 /* migrate.c */ 1056 extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int, 1057 unsigned long); 1058 /* namei.c */ 1059 extern int ext4_orphan_add(handle_t *, struct inode *); 1060 extern int ext4_orphan_del(handle_t *, struct inode *); 1061 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1062 __u32 start_minor_hash, __u32 *next_hash); 1063 1064 /* resize.c */ 1065 extern int ext4_group_add(struct super_block *sb, 1066 struct ext4_new_group_data *input); 1067 extern int ext4_group_extend(struct super_block *sb, 1068 struct ext4_super_block *es, 1069 ext4_fsblk_t n_blocks_count); 1070 1071 /* super.c */ 1072 extern void ext4_error (struct super_block *, const char *, const char *, ...) 1073 __attribute__ ((format (printf, 3, 4))); 1074 extern void __ext4_std_error (struct super_block *, const char *, int); 1075 extern void ext4_abort (struct super_block *, const char *, const char *, ...) 1076 __attribute__ ((format (printf, 3, 4))); 1077 extern void ext4_warning (struct super_block *, const char *, const char *, ...) 1078 __attribute__ ((format (printf, 3, 4))); 1079 extern void ext4_update_dynamic_rev (struct super_block *sb); 1080 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1081 __u32 compat); 1082 extern int ext4_update_rocompat_feature(handle_t *handle, 1083 struct super_block *sb, __u32 rocompat); 1084 extern int ext4_update_incompat_feature(handle_t *handle, 1085 struct super_block *sb, __u32 incompat); 1086 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1087 struct ext4_group_desc *bg); 1088 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1089 struct ext4_group_desc *bg); 1090 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1091 struct ext4_group_desc *bg); 1092 extern void ext4_block_bitmap_set(struct super_block *sb, 1093 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1094 extern void ext4_inode_bitmap_set(struct super_block *sb, 1095 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1096 extern void ext4_inode_table_set(struct super_block *sb, 1097 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1098 1099 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1100 { 1101 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1102 le32_to_cpu(es->s_blocks_count_lo); 1103 } 1104 1105 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1106 { 1107 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1108 le32_to_cpu(es->s_r_blocks_count_lo); 1109 } 1110 1111 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1112 { 1113 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1114 le32_to_cpu(es->s_free_blocks_count_lo); 1115 } 1116 1117 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1118 ext4_fsblk_t blk) 1119 { 1120 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1121 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1122 } 1123 1124 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1125 ext4_fsblk_t blk) 1126 { 1127 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1128 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1129 } 1130 1131 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1132 ext4_fsblk_t blk) 1133 { 1134 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1135 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1136 } 1137 1138 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1139 { 1140 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1141 le32_to_cpu(raw_inode->i_size_lo); 1142 } 1143 1144 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1145 { 1146 raw_inode->i_size_lo = cpu_to_le32(i_size); 1147 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1148 } 1149 1150 static inline 1151 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1152 ext4_group_t group) 1153 { 1154 struct ext4_group_info ***grp_info; 1155 long indexv, indexh; 1156 grp_info = EXT4_SB(sb)->s_group_info; 1157 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1158 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1159 return grp_info[indexv][indexh]; 1160 } 1161 1162 1163 #define ext4_std_error(sb, errno) \ 1164 do { \ 1165 if ((errno)) \ 1166 __ext4_std_error((sb), __FUNCTION__, (errno)); \ 1167 } while (0) 1168 1169 /* 1170 * Inodes and files operations 1171 */ 1172 1173 /* dir.c */ 1174 extern const struct file_operations ext4_dir_operations; 1175 1176 /* file.c */ 1177 extern const struct inode_operations ext4_file_inode_operations; 1178 extern const struct file_operations ext4_file_operations; 1179 1180 /* namei.c */ 1181 extern const struct inode_operations ext4_dir_inode_operations; 1182 extern const struct inode_operations ext4_special_inode_operations; 1183 1184 /* symlink.c */ 1185 extern const struct inode_operations ext4_symlink_inode_operations; 1186 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1187 1188 /* extents.c */ 1189 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1190 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1191 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1192 ext4_lblk_t iblock, 1193 unsigned long max_blocks, struct buffer_head *bh_result, 1194 int create, int extend_disksize); 1195 extern void ext4_ext_truncate(struct inode *, struct page *); 1196 extern void ext4_ext_init(struct super_block *); 1197 extern void ext4_ext_release(struct super_block *); 1198 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1199 loff_t len); 1200 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, 1201 sector_t block, unsigned long max_blocks, 1202 struct buffer_head *bh, int create, 1203 int extend_disksize); 1204 #endif /* __KERNEL__ */ 1205 1206 #endif /* _EXT4_H */ 1207