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 fourth 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__, __func__); \ 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 /* 174 * Structure of a flex block group info 175 */ 176 177 struct flex_groups { 178 __u32 free_inodes; 179 __u32 free_blocks; 180 }; 181 182 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 183 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 184 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 185 186 #ifdef __KERNEL__ 187 #include "ext4_sb.h" 188 #endif 189 /* 190 * Macro-instructions used to manage group descriptors 191 */ 192 #define EXT4_MIN_DESC_SIZE 32 193 #define EXT4_MIN_DESC_SIZE_64BIT 64 194 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 195 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 196 #ifdef __KERNEL__ 197 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 198 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 199 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 200 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 201 #else 202 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 203 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 204 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 205 #endif 206 207 /* 208 * Constants relative to the data blocks 209 */ 210 #define EXT4_NDIR_BLOCKS 12 211 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 212 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 213 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 214 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 215 216 /* 217 * Inode flags 218 */ 219 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 220 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 221 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 222 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 223 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 224 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 225 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 226 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 227 /* Reserved for compression usage... */ 228 #define EXT4_DIRTY_FL 0x00000100 229 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 230 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 231 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 232 /* End compression flags --- maybe not all used */ 233 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 234 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 235 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 236 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 237 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 238 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 239 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 240 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 241 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ 242 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 243 244 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 245 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 246 247 /* 248 * Inode dynamic state flags 249 */ 250 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 251 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 252 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 253 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 254 255 /* Used to pass group descriptor data when online resize is done */ 256 struct ext4_new_group_input { 257 __u32 group; /* Group number for this data */ 258 __u64 block_bitmap; /* Absolute block number of block bitmap */ 259 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 260 __u64 inode_table; /* Absolute block number of inode table start */ 261 __u32 blocks_count; /* Total number of blocks in this group */ 262 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 263 __u16 unused; 264 }; 265 266 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 267 struct ext4_new_group_data { 268 __u32 group; 269 __u64 block_bitmap; 270 __u64 inode_bitmap; 271 __u64 inode_table; 272 __u32 blocks_count; 273 __u16 reserved_blocks; 274 __u16 unused; 275 __u32 free_blocks_count; 276 }; 277 278 /* 279 * Following is used by preallocation code to tell get_blocks() that we 280 * want uninitialzed extents. 281 */ 282 #define EXT4_CREATE_UNINITIALIZED_EXT 2 283 284 /* 285 * ioctl commands 286 */ 287 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 288 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 289 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 290 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 291 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 292 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input) 293 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 294 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 295 #ifdef CONFIG_JBD2_DEBUG 296 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 297 #endif 298 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 299 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 300 #define EXT4_IOC_MIGRATE _IO('f', 7) 301 302 /* 303 * ioctl commands in 32 bit emulation 304 */ 305 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 306 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 307 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 308 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 309 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 310 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 311 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 312 #ifdef CONFIG_JBD2_DEBUG 313 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 314 #endif 315 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 316 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 317 318 319 /* 320 * Mount options 321 */ 322 struct ext4_mount_options { 323 unsigned long s_mount_opt; 324 uid_t s_resuid; 325 gid_t s_resgid; 326 unsigned long s_commit_interval; 327 #ifdef CONFIG_QUOTA 328 int s_jquota_fmt; 329 char *s_qf_names[MAXQUOTAS]; 330 #endif 331 }; 332 333 /* 334 * Structure of an inode on the disk 335 */ 336 struct ext4_inode { 337 __le16 i_mode; /* File mode */ 338 __le16 i_uid; /* Low 16 bits of Owner Uid */ 339 __le32 i_size_lo; /* Size in bytes */ 340 __le32 i_atime; /* Access time */ 341 __le32 i_ctime; /* Inode Change time */ 342 __le32 i_mtime; /* Modification time */ 343 __le32 i_dtime; /* Deletion Time */ 344 __le16 i_gid; /* Low 16 bits of Group Id */ 345 __le16 i_links_count; /* Links count */ 346 __le32 i_blocks_lo; /* Blocks count */ 347 __le32 i_flags; /* File flags */ 348 union { 349 struct { 350 __le32 l_i_version; 351 } linux1; 352 struct { 353 __u32 h_i_translator; 354 } hurd1; 355 struct { 356 __u32 m_i_reserved1; 357 } masix1; 358 } osd1; /* OS dependent 1 */ 359 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 360 __le32 i_generation; /* File version (for NFS) */ 361 __le32 i_file_acl_lo; /* File ACL */ 362 __le32 i_size_high; 363 __le32 i_obso_faddr; /* Obsoleted fragment address */ 364 union { 365 struct { 366 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 367 __le16 l_i_file_acl_high; 368 __le16 l_i_uid_high; /* these 2 fields */ 369 __le16 l_i_gid_high; /* were reserved2[0] */ 370 __u32 l_i_reserved2; 371 } linux2; 372 struct { 373 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 374 __u16 h_i_mode_high; 375 __u16 h_i_uid_high; 376 __u16 h_i_gid_high; 377 __u32 h_i_author; 378 } hurd2; 379 struct { 380 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 381 __le16 m_i_file_acl_high; 382 __u32 m_i_reserved2[2]; 383 } masix2; 384 } osd2; /* OS dependent 2 */ 385 __le16 i_extra_isize; 386 __le16 i_pad1; 387 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 388 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 389 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 390 __le32 i_crtime; /* File Creation time */ 391 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 392 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 393 }; 394 395 396 #define EXT4_EPOCH_BITS 2 397 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 398 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 399 400 /* 401 * Extended fields will fit into an inode if the filesystem was formatted 402 * with large inodes (-I 256 or larger) and there are not currently any EAs 403 * consuming all of the available space. For new inodes we always reserve 404 * enough space for the kernel's known extended fields, but for inodes 405 * created with an old kernel this might not have been the case. None of 406 * the extended inode fields is critical for correct filesystem operation. 407 * This macro checks if a certain field fits in the inode. Note that 408 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 409 */ 410 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 411 ((offsetof(typeof(*ext4_inode), field) + \ 412 sizeof((ext4_inode)->field)) \ 413 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 414 (einode)->i_extra_isize)) \ 415 416 static inline __le32 ext4_encode_extra_time(struct timespec *time) 417 { 418 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 419 time->tv_sec >> 32 : 0) | 420 ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 421 } 422 423 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 424 { 425 if (sizeof(time->tv_sec) > 4) 426 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 427 << 32; 428 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 429 } 430 431 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 432 do { \ 433 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 434 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 435 (raw_inode)->xtime ## _extra = \ 436 ext4_encode_extra_time(&(inode)->xtime); \ 437 } while (0) 438 439 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 440 do { \ 441 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 442 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 443 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 444 (raw_inode)->xtime ## _extra = \ 445 ext4_encode_extra_time(&(einode)->xtime); \ 446 } while (0) 447 448 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 449 do { \ 450 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 451 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 452 ext4_decode_extra_time(&(inode)->xtime, \ 453 raw_inode->xtime ## _extra); \ 454 } while (0) 455 456 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 457 do { \ 458 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 459 (einode)->xtime.tv_sec = \ 460 (signed)le32_to_cpu((raw_inode)->xtime); \ 461 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 462 ext4_decode_extra_time(&(einode)->xtime, \ 463 raw_inode->xtime ## _extra); \ 464 } while (0) 465 466 #define i_disk_version osd1.linux1.l_i_version 467 468 #if defined(__KERNEL__) || defined(__linux__) 469 #define i_reserved1 osd1.linux1.l_i_reserved1 470 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 471 #define i_blocks_high osd2.linux2.l_i_blocks_high 472 #define i_uid_low i_uid 473 #define i_gid_low i_gid 474 #define i_uid_high osd2.linux2.l_i_uid_high 475 #define i_gid_high osd2.linux2.l_i_gid_high 476 #define i_reserved2 osd2.linux2.l_i_reserved2 477 478 #elif defined(__GNU__) 479 480 #define i_translator osd1.hurd1.h_i_translator 481 #define i_uid_high osd2.hurd2.h_i_uid_high 482 #define i_gid_high osd2.hurd2.h_i_gid_high 483 #define i_author osd2.hurd2.h_i_author 484 485 #elif defined(__masix__) 486 487 #define i_reserved1 osd1.masix1.m_i_reserved1 488 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 489 #define i_reserved2 osd2.masix2.m_i_reserved2 490 491 #endif /* defined(__KERNEL__) || defined(__linux__) */ 492 493 /* 494 * File system states 495 */ 496 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 497 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 498 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 499 500 /* 501 * Misc. filesystem flags 502 */ 503 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 504 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 505 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 506 507 /* 508 * Mount flags 509 */ 510 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */ 511 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 512 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 513 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 514 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 515 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 516 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 517 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 518 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 519 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ 520 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 521 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 522 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 523 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 524 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 525 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 526 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 527 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 528 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */ 529 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 530 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 531 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 532 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 533 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 534 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */ 535 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 536 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 537 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 538 #define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */ 539 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ 540 #ifndef _LINUX_EXT2_FS_H 541 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 542 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 543 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 544 EXT4_MOUNT_##opt) 545 #else 546 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD 547 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT 548 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS 549 #endif 550 551 #define ext4_set_bit ext2_set_bit 552 #define ext4_set_bit_atomic ext2_set_bit_atomic 553 #define ext4_clear_bit ext2_clear_bit 554 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 555 #define ext4_test_bit ext2_test_bit 556 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 557 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 558 #define ext4_find_next_bit ext2_find_next_bit 559 560 /* 561 * Maximal mount counts between two filesystem checks 562 */ 563 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 564 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 565 566 /* 567 * Behaviour when detecting errors 568 */ 569 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 570 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 571 #define EXT4_ERRORS_PANIC 3 /* Panic */ 572 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 573 574 /* 575 * Structure of the super block 576 */ 577 struct ext4_super_block { 578 /*00*/ __le32 s_inodes_count; /* Inodes count */ 579 __le32 s_blocks_count_lo; /* Blocks count */ 580 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 581 __le32 s_free_blocks_count_lo; /* Free blocks count */ 582 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 583 __le32 s_first_data_block; /* First Data Block */ 584 __le32 s_log_block_size; /* Block size */ 585 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 586 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 587 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 588 __le32 s_inodes_per_group; /* # Inodes per group */ 589 __le32 s_mtime; /* Mount time */ 590 /*30*/ __le32 s_wtime; /* Write time */ 591 __le16 s_mnt_count; /* Mount count */ 592 __le16 s_max_mnt_count; /* Maximal mount count */ 593 __le16 s_magic; /* Magic signature */ 594 __le16 s_state; /* File system state */ 595 __le16 s_errors; /* Behaviour when detecting errors */ 596 __le16 s_minor_rev_level; /* minor revision level */ 597 /*40*/ __le32 s_lastcheck; /* time of last check */ 598 __le32 s_checkinterval; /* max. time between checks */ 599 __le32 s_creator_os; /* OS */ 600 __le32 s_rev_level; /* Revision level */ 601 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 602 __le16 s_def_resgid; /* Default gid for reserved blocks */ 603 /* 604 * These fields are for EXT4_DYNAMIC_REV superblocks only. 605 * 606 * Note: the difference between the compatible feature set and 607 * the incompatible feature set is that if there is a bit set 608 * in the incompatible feature set that the kernel doesn't 609 * know about, it should refuse to mount the filesystem. 610 * 611 * e2fsck's requirements are more strict; if it doesn't know 612 * about a feature in either the compatible or incompatible 613 * feature set, it must abort and not try to meddle with 614 * things it doesn't understand... 615 */ 616 __le32 s_first_ino; /* First non-reserved inode */ 617 __le16 s_inode_size; /* size of inode structure */ 618 __le16 s_block_group_nr; /* block group # of this superblock */ 619 __le32 s_feature_compat; /* compatible feature set */ 620 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 621 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 622 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 623 /*78*/ char s_volume_name[16]; /* volume name */ 624 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 625 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 626 /* 627 * Performance hints. Directory preallocation should only 628 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 629 */ 630 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 631 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 632 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 633 /* 634 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 635 */ 636 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 637 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 638 __le32 s_journal_dev; /* device number of journal file */ 639 __le32 s_last_orphan; /* start of list of inodes to delete */ 640 __le32 s_hash_seed[4]; /* HTREE hash seed */ 641 __u8 s_def_hash_version; /* Default hash version to use */ 642 __u8 s_reserved_char_pad; 643 __le16 s_desc_size; /* size of group descriptor */ 644 /*100*/ __le32 s_default_mount_opts; 645 __le32 s_first_meta_bg; /* First metablock block group */ 646 __le32 s_mkfs_time; /* When the filesystem was created */ 647 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 648 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 649 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 650 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 651 __le32 s_free_blocks_count_hi; /* Free blocks count */ 652 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 653 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 654 __le32 s_flags; /* Miscellaneous flags */ 655 __le16 s_raid_stride; /* RAID stride */ 656 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 657 __le64 s_mmp_block; /* Block for multi-mount protection */ 658 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 659 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 660 __u8 s_reserved_char_pad2; 661 __le16 s_reserved_pad; 662 __u32 s_reserved[162]; /* Padding to the end of the block */ 663 }; 664 665 #ifdef __KERNEL__ 666 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb) 667 { 668 return sb->s_fs_info; 669 } 670 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 671 { 672 return container_of(inode, struct ext4_inode_info, vfs_inode); 673 } 674 675 static inline struct timespec ext4_current_time(struct inode *inode) 676 { 677 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 678 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 679 } 680 681 682 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 683 { 684 return ino == EXT4_ROOT_INO || 685 ino == EXT4_JOURNAL_INO || 686 ino == EXT4_RESIZE_INO || 687 (ino >= EXT4_FIRST_INO(sb) && 688 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 689 } 690 #else 691 /* Assume that user mode programs are passing in an ext4fs superblock, not 692 * a kernel struct super_block. This will allow us to call the feature-test 693 * macros from user land. */ 694 #define EXT4_SB(sb) (sb) 695 #endif 696 697 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 698 699 /* 700 * Codes for operating systems 701 */ 702 #define EXT4_OS_LINUX 0 703 #define EXT4_OS_HURD 1 704 #define EXT4_OS_MASIX 2 705 #define EXT4_OS_FREEBSD 3 706 #define EXT4_OS_LITES 4 707 708 /* 709 * Revision levels 710 */ 711 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 712 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 713 714 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 715 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 716 717 #define EXT4_GOOD_OLD_INODE_SIZE 128 718 719 /* 720 * Feature set definitions 721 */ 722 723 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 724 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 725 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 726 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 727 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 728 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 729 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 730 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 731 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 732 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 733 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 734 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 735 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 736 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 737 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 738 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 739 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 740 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 741 742 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 743 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 744 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 745 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 746 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 747 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 748 749 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 750 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 751 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 752 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 753 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 754 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 755 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 756 757 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 758 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 759 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 760 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 761 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 762 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 763 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 764 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 765 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 766 767 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 768 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 769 EXT4_FEATURE_INCOMPAT_RECOVER| \ 770 EXT4_FEATURE_INCOMPAT_META_BG| \ 771 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 772 EXT4_FEATURE_INCOMPAT_64BIT| \ 773 EXT4_FEATURE_INCOMPAT_FLEX_BG) 774 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 775 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 776 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 777 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 778 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 779 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 780 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 781 782 /* 783 * Default values for user and/or group using reserved blocks 784 */ 785 #define EXT4_DEF_RESUID 0 786 #define EXT4_DEF_RESGID 0 787 788 /* 789 * Default mount options 790 */ 791 #define EXT4_DEFM_DEBUG 0x0001 792 #define EXT4_DEFM_BSDGROUPS 0x0002 793 #define EXT4_DEFM_XATTR_USER 0x0004 794 #define EXT4_DEFM_ACL 0x0008 795 #define EXT4_DEFM_UID16 0x0010 796 #define EXT4_DEFM_JMODE 0x0060 797 #define EXT4_DEFM_JMODE_DATA 0x0020 798 #define EXT4_DEFM_JMODE_ORDERED 0x0040 799 #define EXT4_DEFM_JMODE_WBACK 0x0060 800 801 /* 802 * Structure of a directory entry 803 */ 804 #define EXT4_NAME_LEN 255 805 806 struct ext4_dir_entry { 807 __le32 inode; /* Inode number */ 808 __le16 rec_len; /* Directory entry length */ 809 __le16 name_len; /* Name length */ 810 char name[EXT4_NAME_LEN]; /* File name */ 811 }; 812 813 /* 814 * The new version of the directory entry. Since EXT4 structures are 815 * stored in intel byte order, and the name_len field could never be 816 * bigger than 255 chars, it's safe to reclaim the extra byte for the 817 * file_type field. 818 */ 819 struct ext4_dir_entry_2 { 820 __le32 inode; /* Inode number */ 821 __le16 rec_len; /* Directory entry length */ 822 __u8 name_len; /* Name length */ 823 __u8 file_type; 824 char name[EXT4_NAME_LEN]; /* File name */ 825 }; 826 827 /* 828 * Ext4 directory file types. Only the low 3 bits are used. The 829 * other bits are reserved for now. 830 */ 831 #define EXT4_FT_UNKNOWN 0 832 #define EXT4_FT_REG_FILE 1 833 #define EXT4_FT_DIR 2 834 #define EXT4_FT_CHRDEV 3 835 #define EXT4_FT_BLKDEV 4 836 #define EXT4_FT_FIFO 5 837 #define EXT4_FT_SOCK 6 838 #define EXT4_FT_SYMLINK 7 839 840 #define EXT4_FT_MAX 8 841 842 /* 843 * EXT4_DIR_PAD defines the directory entries boundaries 844 * 845 * NOTE: It must be a multiple of 4 846 */ 847 #define EXT4_DIR_PAD 4 848 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 849 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 850 ~EXT4_DIR_ROUND) 851 #define EXT4_MAX_REC_LEN ((1<<16)-1) 852 853 static inline unsigned ext4_rec_len_from_disk(__le16 dlen) 854 { 855 unsigned len = le16_to_cpu(dlen); 856 857 if (len == EXT4_MAX_REC_LEN) 858 return 1 << 16; 859 return len; 860 } 861 862 static inline __le16 ext4_rec_len_to_disk(unsigned len) 863 { 864 if (len == (1 << 16)) 865 return cpu_to_le16(EXT4_MAX_REC_LEN); 866 else if (len > (1 << 16)) 867 BUG(); 868 return cpu_to_le16(len); 869 } 870 871 /* 872 * Hash Tree Directory indexing 873 * (c) Daniel Phillips, 2001 874 */ 875 876 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 877 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 878 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 879 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 880 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 881 882 /* Legal values for the dx_root hash_version field: */ 883 884 #define DX_HASH_LEGACY 0 885 #define DX_HASH_HALF_MD4 1 886 #define DX_HASH_TEA 2 887 888 #ifdef __KERNEL__ 889 890 /* hash info structure used by the directory hash */ 891 struct dx_hash_info 892 { 893 u32 hash; 894 u32 minor_hash; 895 int hash_version; 896 u32 *seed; 897 }; 898 899 #define EXT4_HTREE_EOF 0x7fffffff 900 901 /* 902 * Control parameters used by ext4_htree_next_block 903 */ 904 #define HASH_NB_ALWAYS 1 905 906 907 /* 908 * Describe an inode's exact location on disk and in memory 909 */ 910 struct ext4_iloc 911 { 912 struct buffer_head *bh; 913 unsigned long offset; 914 ext4_group_t block_group; 915 }; 916 917 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 918 { 919 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 920 } 921 922 /* 923 * This structure is stuffed into the struct file's private_data field 924 * for directories. It is where we put information so that we can do 925 * readdir operations in hash tree order. 926 */ 927 struct dir_private_info { 928 struct rb_root root; 929 struct rb_node *curr_node; 930 struct fname *extra_fname; 931 loff_t last_pos; 932 __u32 curr_hash; 933 __u32 curr_minor_hash; 934 __u32 next_hash; 935 }; 936 937 /* calculate the first block number of the group */ 938 static inline ext4_fsblk_t 939 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 940 { 941 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 942 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 943 } 944 945 /* 946 * Special error return code only used by dx_probe() and its callers. 947 */ 948 #define ERR_BAD_DX_DIR -75000 949 950 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 951 unsigned long *blockgrpp, ext4_grpblk_t *offsetp); 952 953 /* 954 * Function prototypes 955 */ 956 957 /* 958 * Ok, these declarations are also in <linux/kernel.h> but none of the 959 * ext4 source programs needs to include it so they are duplicated here. 960 */ 961 # define NORET_TYPE /**/ 962 # define ATTRIB_NORET __attribute__((noreturn)) 963 # define NORET_AND noreturn, 964 965 /* balloc.c */ 966 extern unsigned int ext4_block_group(struct super_block *sb, 967 ext4_fsblk_t blocknr); 968 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 969 ext4_fsblk_t blocknr); 970 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 971 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 972 ext4_group_t group); 973 extern ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode, 974 ext4_fsblk_t goal, int *errp); 975 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 976 ext4_fsblk_t goal, unsigned long *count, int *errp); 977 extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode, 978 ext4_lblk_t iblock, ext4_fsblk_t goal, 979 unsigned long *count, int *errp); 980 extern ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode, 981 ext4_fsblk_t goal, unsigned long *count, int *errp); 982 extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi, 983 ext4_fsblk_t nblocks); 984 extern void ext4_free_blocks (handle_t *handle, struct inode *inode, 985 ext4_fsblk_t block, unsigned long count, int metadata); 986 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb, 987 ext4_fsblk_t block, unsigned long count, 988 unsigned long *pdquot_freed_blocks); 989 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *); 990 extern void ext4_check_blocks_bitmap (struct super_block *); 991 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 992 ext4_group_t block_group, 993 struct buffer_head ** bh); 994 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 995 extern void ext4_init_block_alloc_info(struct inode *); 996 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv); 997 998 /* dir.c */ 999 extern int ext4_check_dir_entry(const char *, struct inode *, 1000 struct ext4_dir_entry_2 *, 1001 struct buffer_head *, unsigned long); 1002 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1003 __u32 minor_hash, 1004 struct ext4_dir_entry_2 *dirent); 1005 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1006 1007 /* fsync.c */ 1008 extern int ext4_sync_file (struct file *, struct dentry *, int); 1009 1010 /* hash.c */ 1011 extern int ext4fs_dirhash(const char *name, int len, struct 1012 dx_hash_info *hinfo); 1013 1014 /* ialloc.c */ 1015 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int); 1016 extern void ext4_free_inode (handle_t *, struct inode *); 1017 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long); 1018 extern unsigned long ext4_count_free_inodes (struct super_block *); 1019 extern unsigned long ext4_count_dirs (struct super_block *); 1020 extern void ext4_check_inodes_bitmap (struct super_block *); 1021 extern unsigned long ext4_count_free (struct buffer_head *, unsigned); 1022 1023 /* mballoc.c */ 1024 extern long ext4_mb_stats; 1025 extern long ext4_mb_max_to_scan; 1026 extern int ext4_mb_init(struct super_block *, int); 1027 extern int ext4_mb_release(struct super_block *); 1028 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1029 struct ext4_allocation_request *, int *); 1030 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1031 extern void ext4_mb_discard_inode_preallocations(struct inode *); 1032 extern int __init init_ext4_mballoc(void); 1033 extern void exit_ext4_mballoc(void); 1034 extern void ext4_mb_free_blocks(handle_t *, struct inode *, 1035 unsigned long, unsigned long, int, unsigned long *); 1036 extern int ext4_mb_add_more_groupinfo(struct super_block *sb, 1037 ext4_group_t i, struct ext4_group_desc *desc); 1038 extern void ext4_mb_update_group_info(struct ext4_group_info *grp, 1039 ext4_grpblk_t add); 1040 1041 1042 /* inode.c */ 1043 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 1044 struct buffer_head *bh, ext4_fsblk_t blocknr); 1045 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1046 ext4_lblk_t, int, int *); 1047 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1048 ext4_lblk_t, int, int *); 1049 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode, 1050 ext4_lblk_t iblock, unsigned long maxblocks, 1051 struct buffer_head *bh_result, 1052 int create, int extend_disksize); 1053 1054 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1055 extern int ext4_write_inode (struct inode *, int); 1056 extern int ext4_setattr (struct dentry *, struct iattr *); 1057 extern void ext4_delete_inode (struct inode *); 1058 extern int ext4_sync_inode (handle_t *, struct inode *); 1059 extern void ext4_discard_reservation (struct inode *); 1060 extern void ext4_dirty_inode(struct inode *); 1061 extern int ext4_change_inode_journal_flag(struct inode *, int); 1062 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1063 extern int ext4_can_truncate(struct inode *inode); 1064 extern void ext4_truncate (struct inode *); 1065 extern void ext4_set_inode_flags(struct inode *); 1066 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1067 extern void ext4_set_aops(struct inode *inode); 1068 extern int ext4_writepage_trans_blocks(struct inode *); 1069 extern int ext4_block_truncate_page(handle_t *handle, 1070 struct address_space *mapping, loff_t from); 1071 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page); 1072 1073 /* ioctl.c */ 1074 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1075 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long); 1076 1077 /* migrate.c */ 1078 extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int, 1079 unsigned long); 1080 /* namei.c */ 1081 extern int ext4_orphan_add(handle_t *, struct inode *); 1082 extern int ext4_orphan_del(handle_t *, struct inode *); 1083 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1084 __u32 start_minor_hash, __u32 *next_hash); 1085 1086 /* resize.c */ 1087 extern int ext4_group_add(struct super_block *sb, 1088 struct ext4_new_group_data *input); 1089 extern int ext4_group_extend(struct super_block *sb, 1090 struct ext4_super_block *es, 1091 ext4_fsblk_t n_blocks_count); 1092 1093 /* super.c */ 1094 extern void ext4_error (struct super_block *, const char *, const char *, ...) 1095 __attribute__ ((format (printf, 3, 4))); 1096 extern void __ext4_std_error (struct super_block *, const char *, int); 1097 extern void ext4_abort (struct super_block *, const char *, const char *, ...) 1098 __attribute__ ((format (printf, 3, 4))); 1099 extern void ext4_warning (struct super_block *, const char *, const char *, ...) 1100 __attribute__ ((format (printf, 3, 4))); 1101 extern void ext4_update_dynamic_rev (struct super_block *sb); 1102 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1103 __u32 compat); 1104 extern int ext4_update_rocompat_feature(handle_t *handle, 1105 struct super_block *sb, __u32 rocompat); 1106 extern int ext4_update_incompat_feature(handle_t *handle, 1107 struct super_block *sb, __u32 incompat); 1108 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1109 struct ext4_group_desc *bg); 1110 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1111 struct ext4_group_desc *bg); 1112 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1113 struct ext4_group_desc *bg); 1114 extern void ext4_block_bitmap_set(struct super_block *sb, 1115 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1116 extern void ext4_inode_bitmap_set(struct super_block *sb, 1117 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1118 extern void ext4_inode_table_set(struct super_block *sb, 1119 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1120 1121 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1122 { 1123 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1124 le32_to_cpu(es->s_blocks_count_lo); 1125 } 1126 1127 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1128 { 1129 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1130 le32_to_cpu(es->s_r_blocks_count_lo); 1131 } 1132 1133 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1134 { 1135 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1136 le32_to_cpu(es->s_free_blocks_count_lo); 1137 } 1138 1139 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1140 ext4_fsblk_t blk) 1141 { 1142 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1143 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1144 } 1145 1146 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1147 ext4_fsblk_t blk) 1148 { 1149 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1150 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1151 } 1152 1153 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1154 ext4_fsblk_t blk) 1155 { 1156 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1157 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1158 } 1159 1160 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1161 { 1162 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1163 le32_to_cpu(raw_inode->i_size_lo); 1164 } 1165 1166 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1167 { 1168 raw_inode->i_size_lo = cpu_to_le32(i_size); 1169 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1170 } 1171 1172 static inline 1173 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1174 ext4_group_t group) 1175 { 1176 struct ext4_group_info ***grp_info; 1177 long indexv, indexh; 1178 grp_info = EXT4_SB(sb)->s_group_info; 1179 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1180 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1181 return grp_info[indexv][indexh]; 1182 } 1183 1184 1185 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1186 ext4_group_t block_group) 1187 { 1188 return block_group >> sbi->s_log_groups_per_flex; 1189 } 1190 1191 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1192 { 1193 return 1 << sbi->s_log_groups_per_flex; 1194 } 1195 1196 #define ext4_std_error(sb, errno) \ 1197 do { \ 1198 if ((errno)) \ 1199 __ext4_std_error((sb), __func__, (errno)); \ 1200 } while (0) 1201 1202 /* 1203 * Inodes and files operations 1204 */ 1205 1206 /* dir.c */ 1207 extern const struct file_operations ext4_dir_operations; 1208 1209 /* file.c */ 1210 extern const struct inode_operations ext4_file_inode_operations; 1211 extern const struct file_operations ext4_file_operations; 1212 1213 /* namei.c */ 1214 extern const struct inode_operations ext4_dir_inode_operations; 1215 extern const struct inode_operations ext4_special_inode_operations; 1216 1217 /* symlink.c */ 1218 extern const struct inode_operations ext4_symlink_inode_operations; 1219 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1220 1221 /* extents.c */ 1222 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1223 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1224 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1225 ext4_lblk_t iblock, 1226 unsigned long max_blocks, struct buffer_head *bh_result, 1227 int create, int extend_disksize); 1228 extern void ext4_ext_truncate(struct inode *); 1229 extern void ext4_ext_init(struct super_block *); 1230 extern void ext4_ext_release(struct super_block *); 1231 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1232 loff_t len); 1233 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, 1234 sector_t block, unsigned long max_blocks, 1235 struct buffer_head *bh, int create, 1236 int extend_disksize); 1237 #endif /* __KERNEL__ */ 1238 1239 #endif /* _EXT4_H */ 1240