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 /* blocks already pre-reserved by delayed allocation */ 78 #define EXT4_MB_DELALLOC_RESERVED 1024 79 80 81 struct ext4_allocation_request { 82 /* target inode for block we're allocating */ 83 struct inode *inode; 84 /* logical block in target inode */ 85 ext4_lblk_t logical; 86 /* phys. target (a hint) */ 87 ext4_fsblk_t goal; 88 /* the closest logical allocated block to the left */ 89 ext4_lblk_t lleft; 90 /* phys. block for ^^^ */ 91 ext4_fsblk_t pleft; 92 /* the closest logical allocated block to the right */ 93 ext4_lblk_t lright; 94 /* phys. block for ^^^ */ 95 ext4_fsblk_t pright; 96 /* how many blocks we want to allocate */ 97 unsigned long len; 98 /* flags. see above EXT4_MB_HINT_* */ 99 unsigned long flags; 100 }; 101 102 /* 103 * Special inodes numbers 104 */ 105 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 106 #define EXT4_ROOT_INO 2 /* Root inode */ 107 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 108 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 109 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 110 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 111 112 /* First non-reserved inode for old ext4 filesystems */ 113 #define EXT4_GOOD_OLD_FIRST_INO 11 114 115 /* 116 * Maximal count of links to a file 117 */ 118 #define EXT4_LINK_MAX 65000 119 120 /* 121 * Macro-instructions used to manage several block sizes 122 */ 123 #define EXT4_MIN_BLOCK_SIZE 1024 124 #define EXT4_MAX_BLOCK_SIZE 65536 125 #define EXT4_MIN_BLOCK_LOG_SIZE 10 126 #ifdef __KERNEL__ 127 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 128 #else 129 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 130 #endif 131 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 132 #ifdef __KERNEL__ 133 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 134 #else 135 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 136 #endif 137 #ifdef __KERNEL__ 138 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 139 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 140 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 141 #else 142 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 143 EXT4_GOOD_OLD_INODE_SIZE : \ 144 (s)->s_inode_size) 145 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 146 EXT4_GOOD_OLD_FIRST_INO : \ 147 (s)->s_first_ino) 148 #endif 149 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 150 151 /* 152 * Structure of a blocks group descriptor 153 */ 154 struct ext4_group_desc 155 { 156 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 157 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 158 __le32 bg_inode_table_lo; /* Inodes table block */ 159 __le16 bg_free_blocks_count; /* Free blocks count */ 160 __le16 bg_free_inodes_count; /* Free inodes count */ 161 __le16 bg_used_dirs_count; /* Directories count */ 162 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 163 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 164 __le16 bg_itable_unused; /* Unused inodes count */ 165 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 166 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 167 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 168 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 169 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 170 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 171 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 172 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 173 __u32 bg_reserved2[3]; 174 }; 175 176 /* 177 * Structure of a flex block group info 178 */ 179 180 struct flex_groups { 181 __u32 free_inodes; 182 __u32 free_blocks; 183 }; 184 185 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 186 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 187 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 188 189 #ifdef __KERNEL__ 190 #include "ext4_sb.h" 191 #endif 192 /* 193 * Macro-instructions used to manage group descriptors 194 */ 195 #define EXT4_MIN_DESC_SIZE 32 196 #define EXT4_MIN_DESC_SIZE_64BIT 64 197 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 198 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 199 #ifdef __KERNEL__ 200 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 201 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 202 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 203 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 204 #else 205 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 206 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 207 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 208 #endif 209 210 /* 211 * Constants relative to the data blocks 212 */ 213 #define EXT4_NDIR_BLOCKS 12 214 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 215 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 216 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 217 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 218 219 /* 220 * Inode flags 221 */ 222 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 223 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 224 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 225 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 226 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 227 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 228 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 229 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 230 /* Reserved for compression usage... */ 231 #define EXT4_DIRTY_FL 0x00000100 232 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 233 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 234 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 235 /* End compression flags --- maybe not all used */ 236 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 237 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 238 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 239 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 240 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 241 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 242 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 243 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 244 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ 245 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 246 247 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 248 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ 249 250 /* 251 * Inode dynamic state flags 252 */ 253 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 254 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 255 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 256 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 257 258 /* Used to pass group descriptor data when online resize is done */ 259 struct ext4_new_group_input { 260 __u32 group; /* Group number for this data */ 261 __u64 block_bitmap; /* Absolute block number of block bitmap */ 262 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 263 __u64 inode_table; /* Absolute block number of inode table start */ 264 __u32 blocks_count; /* Total number of blocks in this group */ 265 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 266 __u16 unused; 267 }; 268 269 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 270 struct ext4_new_group_data { 271 __u32 group; 272 __u64 block_bitmap; 273 __u64 inode_bitmap; 274 __u64 inode_table; 275 __u32 blocks_count; 276 __u16 reserved_blocks; 277 __u16 unused; 278 __u32 free_blocks_count; 279 }; 280 281 /* 282 * Following is used by preallocation code to tell get_blocks() that we 283 * want uninitialzed extents. 284 */ 285 #define EXT4_CREATE_UNINITIALIZED_EXT 2 286 287 /* 288 * ioctl commands 289 */ 290 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 291 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 292 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 293 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 294 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 295 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 296 #ifdef CONFIG_JBD2_DEBUG 297 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 298 #endif 299 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 300 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 301 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 302 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 303 #define EXT4_IOC_MIGRATE _IO('f', 9) 304 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 305 306 /* 307 * ioctl commands in 32 bit emulation 308 */ 309 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 310 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 311 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 312 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 313 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 314 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 315 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 316 #ifdef CONFIG_JBD2_DEBUG 317 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 318 #endif 319 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 320 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 321 322 323 /* 324 * Mount options 325 */ 326 struct ext4_mount_options { 327 unsigned long s_mount_opt; 328 uid_t s_resuid; 329 gid_t s_resgid; 330 unsigned long s_commit_interval; 331 #ifdef CONFIG_QUOTA 332 int s_jquota_fmt; 333 char *s_qf_names[MAXQUOTAS]; 334 #endif 335 }; 336 337 /* 338 * Structure of an inode on the disk 339 */ 340 struct ext4_inode { 341 __le16 i_mode; /* File mode */ 342 __le16 i_uid; /* Low 16 bits of Owner Uid */ 343 __le32 i_size_lo; /* Size in bytes */ 344 __le32 i_atime; /* Access time */ 345 __le32 i_ctime; /* Inode Change time */ 346 __le32 i_mtime; /* Modification time */ 347 __le32 i_dtime; /* Deletion Time */ 348 __le16 i_gid; /* Low 16 bits of Group Id */ 349 __le16 i_links_count; /* Links count */ 350 __le32 i_blocks_lo; /* Blocks count */ 351 __le32 i_flags; /* File flags */ 352 union { 353 struct { 354 __le32 l_i_version; 355 } linux1; 356 struct { 357 __u32 h_i_translator; 358 } hurd1; 359 struct { 360 __u32 m_i_reserved1; 361 } masix1; 362 } osd1; /* OS dependent 1 */ 363 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 364 __le32 i_generation; /* File version (for NFS) */ 365 __le32 i_file_acl_lo; /* File ACL */ 366 __le32 i_size_high; 367 __le32 i_obso_faddr; /* Obsoleted fragment address */ 368 union { 369 struct { 370 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 371 __le16 l_i_file_acl_high; 372 __le16 l_i_uid_high; /* these 2 fields */ 373 __le16 l_i_gid_high; /* were reserved2[0] */ 374 __u32 l_i_reserved2; 375 } linux2; 376 struct { 377 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 378 __u16 h_i_mode_high; 379 __u16 h_i_uid_high; 380 __u16 h_i_gid_high; 381 __u32 h_i_author; 382 } hurd2; 383 struct { 384 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 385 __le16 m_i_file_acl_high; 386 __u32 m_i_reserved2[2]; 387 } masix2; 388 } osd2; /* OS dependent 2 */ 389 __le16 i_extra_isize; 390 __le16 i_pad1; 391 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 392 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 393 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 394 __le32 i_crtime; /* File Creation time */ 395 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 396 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 397 }; 398 399 400 #define EXT4_EPOCH_BITS 2 401 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 402 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 403 404 /* 405 * Extended fields will fit into an inode if the filesystem was formatted 406 * with large inodes (-I 256 or larger) and there are not currently any EAs 407 * consuming all of the available space. For new inodes we always reserve 408 * enough space for the kernel's known extended fields, but for inodes 409 * created with an old kernel this might not have been the case. None of 410 * the extended inode fields is critical for correct filesystem operation. 411 * This macro checks if a certain field fits in the inode. Note that 412 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 413 */ 414 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 415 ((offsetof(typeof(*ext4_inode), field) + \ 416 sizeof((ext4_inode)->field)) \ 417 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 418 (einode)->i_extra_isize)) \ 419 420 static inline __le32 ext4_encode_extra_time(struct timespec *time) 421 { 422 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 423 time->tv_sec >> 32 : 0) | 424 ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 425 } 426 427 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 428 { 429 if (sizeof(time->tv_sec) > 4) 430 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 431 << 32; 432 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 433 } 434 435 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 436 do { \ 437 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 438 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 439 (raw_inode)->xtime ## _extra = \ 440 ext4_encode_extra_time(&(inode)->xtime); \ 441 } while (0) 442 443 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 444 do { \ 445 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 446 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 447 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 448 (raw_inode)->xtime ## _extra = \ 449 ext4_encode_extra_time(&(einode)->xtime); \ 450 } while (0) 451 452 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 453 do { \ 454 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 455 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 456 ext4_decode_extra_time(&(inode)->xtime, \ 457 raw_inode->xtime ## _extra); \ 458 } while (0) 459 460 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 461 do { \ 462 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 463 (einode)->xtime.tv_sec = \ 464 (signed)le32_to_cpu((raw_inode)->xtime); \ 465 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 466 ext4_decode_extra_time(&(einode)->xtime, \ 467 raw_inode->xtime ## _extra); \ 468 } while (0) 469 470 #define i_disk_version osd1.linux1.l_i_version 471 472 #if defined(__KERNEL__) || defined(__linux__) 473 #define i_reserved1 osd1.linux1.l_i_reserved1 474 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 475 #define i_blocks_high osd2.linux2.l_i_blocks_high 476 #define i_uid_low i_uid 477 #define i_gid_low i_gid 478 #define i_uid_high osd2.linux2.l_i_uid_high 479 #define i_gid_high osd2.linux2.l_i_gid_high 480 #define i_reserved2 osd2.linux2.l_i_reserved2 481 482 #elif defined(__GNU__) 483 484 #define i_translator osd1.hurd1.h_i_translator 485 #define i_uid_high osd2.hurd2.h_i_uid_high 486 #define i_gid_high osd2.hurd2.h_i_gid_high 487 #define i_author osd2.hurd2.h_i_author 488 489 #elif defined(__masix__) 490 491 #define i_reserved1 osd1.masix1.m_i_reserved1 492 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 493 #define i_reserved2 osd2.masix2.m_i_reserved2 494 495 #endif /* defined(__KERNEL__) || defined(__linux__) */ 496 497 /* 498 * File system states 499 */ 500 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 501 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 502 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 503 504 /* 505 * Misc. filesystem flags 506 */ 507 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 508 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 509 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 510 511 /* 512 * Mount flags 513 */ 514 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 515 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 516 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 517 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 518 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 519 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 520 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 521 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 522 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ 523 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 524 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 525 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 526 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 527 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 528 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 529 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 530 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 531 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */ 532 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 533 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 534 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 535 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 536 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 537 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */ 538 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 539 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 540 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 541 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 542 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 543 544 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ 545 #ifndef _LINUX_EXT2_FS_H 546 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 547 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 548 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 549 EXT4_MOUNT_##opt) 550 #else 551 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD 552 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT 553 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS 554 #endif 555 556 #define ext4_set_bit ext2_set_bit 557 #define ext4_set_bit_atomic ext2_set_bit_atomic 558 #define ext4_clear_bit ext2_clear_bit 559 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 560 #define ext4_test_bit ext2_test_bit 561 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 562 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 563 #define ext4_find_next_bit ext2_find_next_bit 564 565 /* 566 * Maximal mount counts between two filesystem checks 567 */ 568 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 569 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 570 571 /* 572 * Behaviour when detecting errors 573 */ 574 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 575 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 576 #define EXT4_ERRORS_PANIC 3 /* Panic */ 577 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 578 579 /* 580 * Structure of the super block 581 */ 582 struct ext4_super_block { 583 /*00*/ __le32 s_inodes_count; /* Inodes count */ 584 __le32 s_blocks_count_lo; /* Blocks count */ 585 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 586 __le32 s_free_blocks_count_lo; /* Free blocks count */ 587 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 588 __le32 s_first_data_block; /* First Data Block */ 589 __le32 s_log_block_size; /* Block size */ 590 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 591 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 592 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 593 __le32 s_inodes_per_group; /* # Inodes per group */ 594 __le32 s_mtime; /* Mount time */ 595 /*30*/ __le32 s_wtime; /* Write time */ 596 __le16 s_mnt_count; /* Mount count */ 597 __le16 s_max_mnt_count; /* Maximal mount count */ 598 __le16 s_magic; /* Magic signature */ 599 __le16 s_state; /* File system state */ 600 __le16 s_errors; /* Behaviour when detecting errors */ 601 __le16 s_minor_rev_level; /* minor revision level */ 602 /*40*/ __le32 s_lastcheck; /* time of last check */ 603 __le32 s_checkinterval; /* max. time between checks */ 604 __le32 s_creator_os; /* OS */ 605 __le32 s_rev_level; /* Revision level */ 606 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 607 __le16 s_def_resgid; /* Default gid for reserved blocks */ 608 /* 609 * These fields are for EXT4_DYNAMIC_REV superblocks only. 610 * 611 * Note: the difference between the compatible feature set and 612 * the incompatible feature set is that if there is a bit set 613 * in the incompatible feature set that the kernel doesn't 614 * know about, it should refuse to mount the filesystem. 615 * 616 * e2fsck's requirements are more strict; if it doesn't know 617 * about a feature in either the compatible or incompatible 618 * feature set, it must abort and not try to meddle with 619 * things it doesn't understand... 620 */ 621 __le32 s_first_ino; /* First non-reserved inode */ 622 __le16 s_inode_size; /* size of inode structure */ 623 __le16 s_block_group_nr; /* block group # of this superblock */ 624 __le32 s_feature_compat; /* compatible feature set */ 625 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 626 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 627 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 628 /*78*/ char s_volume_name[16]; /* volume name */ 629 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 630 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 631 /* 632 * Performance hints. Directory preallocation should only 633 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 634 */ 635 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 636 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 637 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 638 /* 639 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 640 */ 641 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 642 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 643 __le32 s_journal_dev; /* device number of journal file */ 644 __le32 s_last_orphan; /* start of list of inodes to delete */ 645 __le32 s_hash_seed[4]; /* HTREE hash seed */ 646 __u8 s_def_hash_version; /* Default hash version to use */ 647 __u8 s_reserved_char_pad; 648 __le16 s_desc_size; /* size of group descriptor */ 649 /*100*/ __le32 s_default_mount_opts; 650 __le32 s_first_meta_bg; /* First metablock block group */ 651 __le32 s_mkfs_time; /* When the filesystem was created */ 652 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 653 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 654 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 655 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 656 __le32 s_free_blocks_count_hi; /* Free blocks count */ 657 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 658 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 659 __le32 s_flags; /* Miscellaneous flags */ 660 __le16 s_raid_stride; /* RAID stride */ 661 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 662 __le64 s_mmp_block; /* Block for multi-mount protection */ 663 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 664 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 665 __u8 s_reserved_char_pad2; 666 __le16 s_reserved_pad; 667 __u32 s_reserved[162]; /* Padding to the end of the block */ 668 }; 669 670 #ifdef __KERNEL__ 671 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 672 { 673 return sb->s_fs_info; 674 } 675 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 676 { 677 return container_of(inode, struct ext4_inode_info, vfs_inode); 678 } 679 680 static inline struct timespec ext4_current_time(struct inode *inode) 681 { 682 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 683 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 684 } 685 686 687 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 688 { 689 return ino == EXT4_ROOT_INO || 690 ino == EXT4_JOURNAL_INO || 691 ino == EXT4_RESIZE_INO || 692 (ino >= EXT4_FIRST_INO(sb) && 693 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 694 } 695 #else 696 /* Assume that user mode programs are passing in an ext4fs superblock, not 697 * a kernel struct super_block. This will allow us to call the feature-test 698 * macros from user land. */ 699 #define EXT4_SB(sb) (sb) 700 #endif 701 702 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 703 704 /* 705 * Codes for operating systems 706 */ 707 #define EXT4_OS_LINUX 0 708 #define EXT4_OS_HURD 1 709 #define EXT4_OS_MASIX 2 710 #define EXT4_OS_FREEBSD 3 711 #define EXT4_OS_LITES 4 712 713 /* 714 * Revision levels 715 */ 716 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 717 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 718 719 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 720 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 721 722 #define EXT4_GOOD_OLD_INODE_SIZE 128 723 724 /* 725 * Feature set definitions 726 */ 727 728 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 729 (EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) 730 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 731 (EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) 732 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 733 (EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) 734 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 735 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 736 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 737 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 738 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 739 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 740 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 741 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 742 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 743 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 744 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 745 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 746 747 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 748 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 749 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 750 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 751 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 752 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 753 754 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 755 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 756 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 757 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 758 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 759 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 760 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 761 762 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 763 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 764 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 765 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 766 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 767 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 768 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 769 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 770 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 771 772 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 773 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 774 EXT4_FEATURE_INCOMPAT_RECOVER| \ 775 EXT4_FEATURE_INCOMPAT_META_BG| \ 776 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 777 EXT4_FEATURE_INCOMPAT_64BIT| \ 778 EXT4_FEATURE_INCOMPAT_FLEX_BG) 779 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 780 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 781 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 782 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 783 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 784 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 785 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 786 787 /* 788 * Default values for user and/or group using reserved blocks 789 */ 790 #define EXT4_DEF_RESUID 0 791 #define EXT4_DEF_RESGID 0 792 793 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 794 795 /* 796 * Default mount options 797 */ 798 #define EXT4_DEFM_DEBUG 0x0001 799 #define EXT4_DEFM_BSDGROUPS 0x0002 800 #define EXT4_DEFM_XATTR_USER 0x0004 801 #define EXT4_DEFM_ACL 0x0008 802 #define EXT4_DEFM_UID16 0x0010 803 #define EXT4_DEFM_JMODE 0x0060 804 #define EXT4_DEFM_JMODE_DATA 0x0020 805 #define EXT4_DEFM_JMODE_ORDERED 0x0040 806 #define EXT4_DEFM_JMODE_WBACK 0x0060 807 808 /* 809 * Structure of a directory entry 810 */ 811 #define EXT4_NAME_LEN 255 812 813 struct ext4_dir_entry { 814 __le32 inode; /* Inode number */ 815 __le16 rec_len; /* Directory entry length */ 816 __le16 name_len; /* Name length */ 817 char name[EXT4_NAME_LEN]; /* File name */ 818 }; 819 820 /* 821 * The new version of the directory entry. Since EXT4 structures are 822 * stored in intel byte order, and the name_len field could never be 823 * bigger than 255 chars, it's safe to reclaim the extra byte for the 824 * file_type field. 825 */ 826 struct ext4_dir_entry_2 { 827 __le32 inode; /* Inode number */ 828 __le16 rec_len; /* Directory entry length */ 829 __u8 name_len; /* Name length */ 830 __u8 file_type; 831 char name[EXT4_NAME_LEN]; /* File name */ 832 }; 833 834 /* 835 * Ext4 directory file types. Only the low 3 bits are used. The 836 * other bits are reserved for now. 837 */ 838 #define EXT4_FT_UNKNOWN 0 839 #define EXT4_FT_REG_FILE 1 840 #define EXT4_FT_DIR 2 841 #define EXT4_FT_CHRDEV 3 842 #define EXT4_FT_BLKDEV 4 843 #define EXT4_FT_FIFO 5 844 #define EXT4_FT_SOCK 6 845 #define EXT4_FT_SYMLINK 7 846 847 #define EXT4_FT_MAX 8 848 849 /* 850 * EXT4_DIR_PAD defines the directory entries boundaries 851 * 852 * NOTE: It must be a multiple of 4 853 */ 854 #define EXT4_DIR_PAD 4 855 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 856 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 857 ~EXT4_DIR_ROUND) 858 #define EXT4_MAX_REC_LEN ((1<<16)-1) 859 860 static inline unsigned ext4_rec_len_from_disk(__le16 dlen) 861 { 862 unsigned len = le16_to_cpu(dlen); 863 864 if (len == EXT4_MAX_REC_LEN) 865 return 1 << 16; 866 return len; 867 } 868 869 static inline __le16 ext4_rec_len_to_disk(unsigned len) 870 { 871 if (len == (1 << 16)) 872 return cpu_to_le16(EXT4_MAX_REC_LEN); 873 else if (len > (1 << 16)) 874 BUG(); 875 return cpu_to_le16(len); 876 } 877 878 /* 879 * Hash Tree Directory indexing 880 * (c) Daniel Phillips, 2001 881 */ 882 883 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 884 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 885 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 886 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 887 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 888 889 /* Legal values for the dx_root hash_version field: */ 890 891 #define DX_HASH_LEGACY 0 892 #define DX_HASH_HALF_MD4 1 893 #define DX_HASH_TEA 2 894 895 #ifdef __KERNEL__ 896 897 /* hash info structure used by the directory hash */ 898 struct dx_hash_info 899 { 900 u32 hash; 901 u32 minor_hash; 902 int hash_version; 903 u32 *seed; 904 }; 905 906 #define EXT4_HTREE_EOF 0x7fffffff 907 908 /* 909 * Control parameters used by ext4_htree_next_block 910 */ 911 #define HASH_NB_ALWAYS 1 912 913 914 /* 915 * Describe an inode's exact location on disk and in memory 916 */ 917 struct ext4_iloc 918 { 919 struct buffer_head *bh; 920 unsigned long offset; 921 ext4_group_t block_group; 922 }; 923 924 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 925 { 926 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 927 } 928 929 /* 930 * This structure is stuffed into the struct file's private_data field 931 * for directories. It is where we put information so that we can do 932 * readdir operations in hash tree order. 933 */ 934 struct dir_private_info { 935 struct rb_root root; 936 struct rb_node *curr_node; 937 struct fname *extra_fname; 938 loff_t last_pos; 939 __u32 curr_hash; 940 __u32 curr_minor_hash; 941 __u32 next_hash; 942 }; 943 944 /* calculate the first block number of the group */ 945 static inline ext4_fsblk_t 946 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 947 { 948 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 949 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 950 } 951 952 /* 953 * Special error return code only used by dx_probe() and its callers. 954 */ 955 #define ERR_BAD_DX_DIR -75000 956 957 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 958 unsigned long *blockgrpp, ext4_grpblk_t *offsetp); 959 960 extern struct proc_dir_entry *ext4_proc_root; 961 962 #ifdef CONFIG_PROC_FS 963 extern const struct file_operations ext4_ui_proc_fops; 964 965 #define EXT4_PROC_HANDLER(name, var) \ 966 do { \ 967 proc = proc_create_data(name, mode, sbi->s_proc, \ 968 &ext4_ui_proc_fops, &sbi->s_##var); \ 969 if (proc == NULL) { \ 970 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \ 971 goto err_out; \ 972 } \ 973 } while (0) 974 #else 975 #define EXT4_PROC_HANDLER(name, var) 976 #endif 977 978 /* 979 * Function prototypes 980 */ 981 982 /* 983 * Ok, these declarations are also in <linux/kernel.h> but none of the 984 * ext4 source programs needs to include it so they are duplicated here. 985 */ 986 # define NORET_TYPE /**/ 987 # define ATTRIB_NORET __attribute__((noreturn)) 988 # define NORET_AND noreturn, 989 990 /* balloc.c */ 991 extern unsigned int ext4_block_group(struct super_block *sb, 992 ext4_fsblk_t blocknr); 993 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 994 ext4_fsblk_t blocknr); 995 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 996 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 997 ext4_group_t group); 998 extern ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode, 999 ext4_fsblk_t goal, int *errp); 1000 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1001 ext4_fsblk_t goal, unsigned long *count, int *errp); 1002 extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode, 1003 ext4_lblk_t iblock, ext4_fsblk_t goal, 1004 unsigned long *count, int *errp); 1005 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1006 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1007 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1008 ext4_fsblk_t block, unsigned long count, int metadata); 1009 extern void ext4_free_blocks_sb(handle_t *handle, struct super_block *sb, 1010 ext4_fsblk_t block, unsigned long count, 1011 unsigned long *pdquot_freed_blocks); 1012 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1013 extern void ext4_check_blocks_bitmap(struct super_block *); 1014 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1015 ext4_group_t block_group, 1016 struct buffer_head ** bh); 1017 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1018 1019 /* dir.c */ 1020 extern int ext4_check_dir_entry(const char *, struct inode *, 1021 struct ext4_dir_entry_2 *, 1022 struct buffer_head *, unsigned long); 1023 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1024 __u32 minor_hash, 1025 struct ext4_dir_entry_2 *dirent); 1026 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1027 1028 /* fsync.c */ 1029 extern int ext4_sync_file(struct file *, struct dentry *, int); 1030 1031 /* hash.c */ 1032 extern int ext4fs_dirhash(const char *name, int len, struct 1033 dx_hash_info *hinfo); 1034 1035 /* ialloc.c */ 1036 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int); 1037 extern void ext4_free_inode(handle_t *, struct inode *); 1038 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1039 extern unsigned long ext4_count_free_inodes(struct super_block *); 1040 extern unsigned long ext4_count_dirs(struct super_block *); 1041 extern void ext4_check_inodes_bitmap(struct super_block *); 1042 extern unsigned long ext4_count_free(struct buffer_head *, unsigned); 1043 1044 /* mballoc.c */ 1045 extern long ext4_mb_stats; 1046 extern long ext4_mb_max_to_scan; 1047 extern int ext4_mb_init(struct super_block *, int); 1048 extern int ext4_mb_release(struct super_block *); 1049 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1050 struct ext4_allocation_request *, int *); 1051 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1052 extern void ext4_discard_preallocations(struct inode *); 1053 extern int __init init_ext4_mballoc(void); 1054 extern void exit_ext4_mballoc(void); 1055 extern void ext4_mb_free_blocks(handle_t *, struct inode *, 1056 unsigned long, unsigned long, int, unsigned long *); 1057 extern int ext4_mb_add_more_groupinfo(struct super_block *sb, 1058 ext4_group_t i, struct ext4_group_desc *desc); 1059 extern void ext4_mb_update_group_info(struct ext4_group_info *grp, 1060 ext4_grpblk_t add); 1061 1062 1063 /* inode.c */ 1064 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 1065 struct buffer_head *bh, ext4_fsblk_t blocknr); 1066 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1067 ext4_lblk_t, int, int *); 1068 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1069 ext4_lblk_t, int, int *); 1070 int ext4_get_block(struct inode *inode, sector_t iblock, 1071 struct buffer_head *bh_result, int create); 1072 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode, 1073 ext4_lblk_t iblock, unsigned long maxblocks, 1074 struct buffer_head *bh_result, 1075 int create, int extend_disksize); 1076 1077 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1078 extern int ext4_write_inode(struct inode *, int); 1079 extern int ext4_setattr(struct dentry *, struct iattr *); 1080 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1081 struct kstat *stat); 1082 extern void ext4_delete_inode(struct inode *); 1083 extern int ext4_sync_inode(handle_t *, struct inode *); 1084 extern void ext4_dirty_inode(struct inode *); 1085 extern int ext4_change_inode_journal_flag(struct inode *, int); 1086 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1087 extern int ext4_can_truncate(struct inode *inode); 1088 extern void ext4_truncate(struct inode *); 1089 extern void ext4_set_inode_flags(struct inode *); 1090 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1091 extern void ext4_set_aops(struct inode *inode); 1092 extern int ext4_writepage_trans_blocks(struct inode *); 1093 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1094 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1095 extern int ext4_block_truncate_page(handle_t *handle, 1096 struct address_space *mapping, loff_t from); 1097 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page); 1098 1099 /* ioctl.c */ 1100 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1101 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1102 1103 /* migrate.c */ 1104 extern int ext4_ext_migrate(struct inode *); 1105 /* namei.c */ 1106 extern int ext4_orphan_add(handle_t *, struct inode *); 1107 extern int ext4_orphan_del(handle_t *, struct inode *); 1108 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1109 __u32 start_minor_hash, __u32 *next_hash); 1110 1111 /* resize.c */ 1112 extern int ext4_group_add(struct super_block *sb, 1113 struct ext4_new_group_data *input); 1114 extern int ext4_group_extend(struct super_block *sb, 1115 struct ext4_super_block *es, 1116 ext4_fsblk_t n_blocks_count); 1117 1118 /* super.c */ 1119 extern void ext4_error(struct super_block *, const char *, const char *, ...) 1120 __attribute__ ((format (printf, 3, 4))); 1121 extern void __ext4_std_error(struct super_block *, const char *, int); 1122 extern void ext4_abort(struct super_block *, const char *, const char *, ...) 1123 __attribute__ ((format (printf, 3, 4))); 1124 extern void ext4_warning(struct super_block *, const char *, const char *, ...) 1125 __attribute__ ((format (printf, 3, 4))); 1126 extern void ext4_update_dynamic_rev(struct super_block *sb); 1127 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1128 __u32 compat); 1129 extern int ext4_update_rocompat_feature(handle_t *handle, 1130 struct super_block *sb, __u32 rocompat); 1131 extern int ext4_update_incompat_feature(handle_t *handle, 1132 struct super_block *sb, __u32 incompat); 1133 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1134 struct ext4_group_desc *bg); 1135 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1136 struct ext4_group_desc *bg); 1137 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1138 struct ext4_group_desc *bg); 1139 extern void ext4_block_bitmap_set(struct super_block *sb, 1140 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1141 extern void ext4_inode_bitmap_set(struct super_block *sb, 1142 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1143 extern void ext4_inode_table_set(struct super_block *sb, 1144 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1145 1146 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1147 { 1148 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1149 le32_to_cpu(es->s_blocks_count_lo); 1150 } 1151 1152 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1153 { 1154 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1155 le32_to_cpu(es->s_r_blocks_count_lo); 1156 } 1157 1158 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1159 { 1160 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1161 le32_to_cpu(es->s_free_blocks_count_lo); 1162 } 1163 1164 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1165 ext4_fsblk_t blk) 1166 { 1167 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1168 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1169 } 1170 1171 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1172 ext4_fsblk_t blk) 1173 { 1174 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1175 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1176 } 1177 1178 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1179 ext4_fsblk_t blk) 1180 { 1181 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1182 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1183 } 1184 1185 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1186 { 1187 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1188 le32_to_cpu(raw_inode->i_size_lo); 1189 } 1190 1191 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1192 { 1193 raw_inode->i_size_lo = cpu_to_le32(i_size); 1194 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1195 } 1196 1197 static inline 1198 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1199 ext4_group_t group) 1200 { 1201 struct ext4_group_info ***grp_info; 1202 long indexv, indexh; 1203 grp_info = EXT4_SB(sb)->s_group_info; 1204 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1205 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1206 return grp_info[indexv][indexh]; 1207 } 1208 1209 1210 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1211 ext4_group_t block_group) 1212 { 1213 return block_group >> sbi->s_log_groups_per_flex; 1214 } 1215 1216 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1217 { 1218 return 1 << sbi->s_log_groups_per_flex; 1219 } 1220 1221 #define ext4_std_error(sb, errno) \ 1222 do { \ 1223 if ((errno)) \ 1224 __ext4_std_error((sb), __func__, (errno)); \ 1225 } while (0) 1226 1227 #ifdef CONFIG_SMP 1228 /* Each CPU can accumulate FBC_BATCH blocks in their local 1229 * counters. So we need to make sure we have free blocks more 1230 * than FBC_BATCH * nr_cpu_ids. Also add a window of 4 times. 1231 */ 1232 #define EXT4_FREEBLOCKS_WATERMARK (4 * (FBC_BATCH * nr_cpu_ids)) 1233 #else 1234 #define EXT4_FREEBLOCKS_WATERMARK 0 1235 #endif 1236 1237 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1238 { 1239 /* 1240 * XXX: replace with spinlock if seen contended -bzzz 1241 */ 1242 down_write(&EXT4_I(inode)->i_data_sem); 1243 if (newsize > EXT4_I(inode)->i_disksize) 1244 EXT4_I(inode)->i_disksize = newsize; 1245 up_write(&EXT4_I(inode)->i_data_sem); 1246 return ; 1247 } 1248 1249 /* 1250 * Inodes and files operations 1251 */ 1252 1253 /* dir.c */ 1254 extern const struct file_operations ext4_dir_operations; 1255 1256 /* file.c */ 1257 extern const struct inode_operations ext4_file_inode_operations; 1258 extern const struct file_operations ext4_file_operations; 1259 1260 /* namei.c */ 1261 extern const struct inode_operations ext4_dir_inode_operations; 1262 extern const struct inode_operations ext4_special_inode_operations; 1263 1264 /* symlink.c */ 1265 extern const struct inode_operations ext4_symlink_inode_operations; 1266 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1267 1268 /* extents.c */ 1269 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1270 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1271 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1272 int chunk); 1273 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1274 ext4_lblk_t iblock, 1275 unsigned long max_blocks, struct buffer_head *bh_result, 1276 int create, int extend_disksize); 1277 extern void ext4_ext_truncate(struct inode *); 1278 extern void ext4_ext_init(struct super_block *); 1279 extern void ext4_ext_release(struct super_block *); 1280 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1281 loff_t len); 1282 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, 1283 sector_t block, unsigned long max_blocks, 1284 struct buffer_head *bh, int create, 1285 int extend_disksize, int flag); 1286 #endif /* __KERNEL__ */ 1287 1288 #endif /* _EXT4_H */ 1289