1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include "ext4_i.h" 25 26 /* 27 * The fourth extended filesystem constants/structures 28 */ 29 30 /* 31 * Define EXT4FS_DEBUG to produce debug messages 32 */ 33 #undef EXT4FS_DEBUG 34 35 /* 36 * Debug code 37 */ 38 #ifdef EXT4FS_DEBUG 39 #define ext4_debug(f, a...) \ 40 do { \ 41 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 42 __FILE__, __LINE__, __func__); \ 43 printk(KERN_DEBUG f, ## a); \ 44 } while (0) 45 #else 46 #define ext4_debug(f, a...) do {} while (0) 47 #endif 48 49 /* prefer goal again. length */ 50 #define EXT4_MB_HINT_MERGE 1 51 /* blocks already reserved */ 52 #define EXT4_MB_HINT_RESERVED 2 53 /* metadata is being allocated */ 54 #define EXT4_MB_HINT_METADATA 4 55 /* first blocks in the file */ 56 #define EXT4_MB_HINT_FIRST 8 57 /* search for the best chunk */ 58 #define EXT4_MB_HINT_BEST 16 59 /* data is being allocated */ 60 #define EXT4_MB_HINT_DATA 32 61 /* don't preallocate (for tails) */ 62 #define EXT4_MB_HINT_NOPREALLOC 64 63 /* allocate for locality group */ 64 #define EXT4_MB_HINT_GROUP_ALLOC 128 65 /* allocate goal blocks or none */ 66 #define EXT4_MB_HINT_GOAL_ONLY 256 67 /* goal is meaningful */ 68 #define EXT4_MB_HINT_TRY_GOAL 512 69 /* blocks already pre-reserved by delayed allocation */ 70 #define EXT4_MB_DELALLOC_RESERVED 1024 71 72 73 struct ext4_allocation_request { 74 /* target inode for block we're allocating */ 75 struct inode *inode; 76 /* logical block in target inode */ 77 ext4_lblk_t logical; 78 /* phys. target (a hint) */ 79 ext4_fsblk_t goal; 80 /* the closest logical allocated block to the left */ 81 ext4_lblk_t lleft; 82 /* phys. block for ^^^ */ 83 ext4_fsblk_t pleft; 84 /* the closest logical allocated block to the right */ 85 ext4_lblk_t lright; 86 /* phys. block for ^^^ */ 87 ext4_fsblk_t pright; 88 /* how many blocks we want to allocate */ 89 unsigned int len; 90 /* flags. see above EXT4_MB_HINT_* */ 91 unsigned int flags; 92 }; 93 94 /* 95 * Special inodes numbers 96 */ 97 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 98 #define EXT4_ROOT_INO 2 /* Root inode */ 99 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 100 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 101 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 102 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 103 104 /* First non-reserved inode for old ext4 filesystems */ 105 #define EXT4_GOOD_OLD_FIRST_INO 11 106 107 /* 108 * Maximal count of links to a file 109 */ 110 #define EXT4_LINK_MAX 65000 111 112 /* 113 * Macro-instructions used to manage several block sizes 114 */ 115 #define EXT4_MIN_BLOCK_SIZE 1024 116 #define EXT4_MAX_BLOCK_SIZE 65536 117 #define EXT4_MIN_BLOCK_LOG_SIZE 10 118 #ifdef __KERNEL__ 119 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 120 #else 121 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 122 #endif 123 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 124 #ifdef __KERNEL__ 125 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 126 #else 127 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 128 #endif 129 #ifdef __KERNEL__ 130 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 131 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 132 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 133 #else 134 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 135 EXT4_GOOD_OLD_INODE_SIZE : \ 136 (s)->s_inode_size) 137 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 138 EXT4_GOOD_OLD_FIRST_INO : \ 139 (s)->s_first_ino) 140 #endif 141 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 142 143 /* 144 * Structure of a blocks group descriptor 145 */ 146 struct ext4_group_desc 147 { 148 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 149 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 150 __le32 bg_inode_table_lo; /* Inodes table block */ 151 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 152 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 153 __le16 bg_used_dirs_count_lo; /* Directories count */ 154 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 155 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 156 __le16 bg_itable_unused_lo; /* Unused inodes count */ 157 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 158 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 159 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 160 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 161 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 162 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 163 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 164 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 165 __u32 bg_reserved2[3]; 166 }; 167 168 /* 169 * Structure of a flex block group info 170 */ 171 172 struct flex_groups { 173 atomic_t free_inodes; 174 atomic_t free_blocks; 175 atomic_t used_dirs; 176 }; 177 178 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 179 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 180 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 181 182 #ifdef __KERNEL__ 183 #include "ext4_sb.h" 184 #endif 185 /* 186 * Macro-instructions used to manage group descriptors 187 */ 188 #define EXT4_MIN_DESC_SIZE 32 189 #define EXT4_MIN_DESC_SIZE_64BIT 64 190 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 191 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 192 #ifdef __KERNEL__ 193 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 194 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 195 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 196 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 197 #else 198 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 199 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 200 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 201 #endif 202 203 /* 204 * Constants relative to the data blocks 205 */ 206 #define EXT4_NDIR_BLOCKS 12 207 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 208 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 209 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 210 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 211 212 /* 213 * Inode flags 214 */ 215 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 216 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 217 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 218 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 219 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 220 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 221 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 222 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 223 /* Reserved for compression usage... */ 224 #define EXT4_DIRTY_FL 0x00000100 225 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 226 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 227 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 228 /* End compression flags --- maybe not all used */ 229 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 230 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 231 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 232 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 233 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 234 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 235 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 236 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 237 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ 238 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 239 240 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 241 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ 242 243 /* Flags that should be inherited by new inodes from their parent. */ 244 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 245 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 246 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 247 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 248 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 249 250 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 251 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 252 253 /* Flags that are appropriate for non-directories/regular files. */ 254 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 255 256 /* Mask out flags that are inappropriate for the given type of inode. */ 257 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 258 { 259 if (S_ISDIR(mode)) 260 return flags; 261 else if (S_ISREG(mode)) 262 return flags & EXT4_REG_FLMASK; 263 else 264 return flags & EXT4_OTHER_FLMASK; 265 } 266 267 /* 268 * Inode dynamic state flags 269 */ 270 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 271 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 272 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 273 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 274 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ 275 276 /* Used to pass group descriptor data when online resize is done */ 277 struct ext4_new_group_input { 278 __u32 group; /* Group number for this data */ 279 __u64 block_bitmap; /* Absolute block number of block bitmap */ 280 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 281 __u64 inode_table; /* Absolute block number of inode table start */ 282 __u32 blocks_count; /* Total number of blocks in this group */ 283 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 284 __u16 unused; 285 }; 286 287 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 288 struct ext4_new_group_data { 289 __u32 group; 290 __u64 block_bitmap; 291 __u64 inode_bitmap; 292 __u64 inode_table; 293 __u32 blocks_count; 294 __u16 reserved_blocks; 295 __u16 unused; 296 __u32 free_blocks_count; 297 }; 298 299 /* 300 * Following is used by preallocation code to tell get_blocks() that we 301 * want uninitialzed extents. 302 */ 303 #define EXT4_CREATE_UNINITIALIZED_EXT 2 304 305 /* 306 * ioctl commands 307 */ 308 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 309 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 310 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 311 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 312 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 313 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 314 #ifdef CONFIG_JBD2_DEBUG 315 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 316 #endif 317 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 318 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 319 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 320 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 321 #define EXT4_IOC_MIGRATE _IO('f', 9) 322 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 323 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 324 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 325 326 /* 327 * ioctl commands in 32 bit emulation 328 */ 329 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 330 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 331 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 332 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 333 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 334 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 335 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 336 #ifdef CONFIG_JBD2_DEBUG 337 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 338 #endif 339 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 340 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 341 342 343 /* 344 * Mount options 345 */ 346 struct ext4_mount_options { 347 unsigned long s_mount_opt; 348 uid_t s_resuid; 349 gid_t s_resgid; 350 unsigned long s_commit_interval; 351 u32 s_min_batch_time, s_max_batch_time; 352 #ifdef CONFIG_QUOTA 353 int s_jquota_fmt; 354 char *s_qf_names[MAXQUOTAS]; 355 #endif 356 }; 357 358 /* 359 * Structure of an inode on the disk 360 */ 361 struct ext4_inode { 362 __le16 i_mode; /* File mode */ 363 __le16 i_uid; /* Low 16 bits of Owner Uid */ 364 __le32 i_size_lo; /* Size in bytes */ 365 __le32 i_atime; /* Access time */ 366 __le32 i_ctime; /* Inode Change time */ 367 __le32 i_mtime; /* Modification time */ 368 __le32 i_dtime; /* Deletion Time */ 369 __le16 i_gid; /* Low 16 bits of Group Id */ 370 __le16 i_links_count; /* Links count */ 371 __le32 i_blocks_lo; /* Blocks count */ 372 __le32 i_flags; /* File flags */ 373 union { 374 struct { 375 __le32 l_i_version; 376 } linux1; 377 struct { 378 __u32 h_i_translator; 379 } hurd1; 380 struct { 381 __u32 m_i_reserved1; 382 } masix1; 383 } osd1; /* OS dependent 1 */ 384 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 385 __le32 i_generation; /* File version (for NFS) */ 386 __le32 i_file_acl_lo; /* File ACL */ 387 __le32 i_size_high; 388 __le32 i_obso_faddr; /* Obsoleted fragment address */ 389 union { 390 struct { 391 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 392 __le16 l_i_file_acl_high; 393 __le16 l_i_uid_high; /* these 2 fields */ 394 __le16 l_i_gid_high; /* were reserved2[0] */ 395 __u32 l_i_reserved2; 396 } linux2; 397 struct { 398 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 399 __u16 h_i_mode_high; 400 __u16 h_i_uid_high; 401 __u16 h_i_gid_high; 402 __u32 h_i_author; 403 } hurd2; 404 struct { 405 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 406 __le16 m_i_file_acl_high; 407 __u32 m_i_reserved2[2]; 408 } masix2; 409 } osd2; /* OS dependent 2 */ 410 __le16 i_extra_isize; 411 __le16 i_pad1; 412 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 413 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 414 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 415 __le32 i_crtime; /* File Creation time */ 416 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 417 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 418 }; 419 420 421 #define EXT4_EPOCH_BITS 2 422 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 423 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 424 425 /* 426 * Extended fields will fit into an inode if the filesystem was formatted 427 * with large inodes (-I 256 or larger) and there are not currently any EAs 428 * consuming all of the available space. For new inodes we always reserve 429 * enough space for the kernel's known extended fields, but for inodes 430 * created with an old kernel this might not have been the case. None of 431 * the extended inode fields is critical for correct filesystem operation. 432 * This macro checks if a certain field fits in the inode. Note that 433 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 434 */ 435 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 436 ((offsetof(typeof(*ext4_inode), field) + \ 437 sizeof((ext4_inode)->field)) \ 438 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 439 (einode)->i_extra_isize)) \ 440 441 static inline __le32 ext4_encode_extra_time(struct timespec *time) 442 { 443 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 444 time->tv_sec >> 32 : 0) | 445 ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 446 } 447 448 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 449 { 450 if (sizeof(time->tv_sec) > 4) 451 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 452 << 32; 453 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 454 } 455 456 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 457 do { \ 458 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 459 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 460 (raw_inode)->xtime ## _extra = \ 461 ext4_encode_extra_time(&(inode)->xtime); \ 462 } while (0) 463 464 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 465 do { \ 466 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 467 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 468 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 469 (raw_inode)->xtime ## _extra = \ 470 ext4_encode_extra_time(&(einode)->xtime); \ 471 } while (0) 472 473 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 474 do { \ 475 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 476 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 477 ext4_decode_extra_time(&(inode)->xtime, \ 478 raw_inode->xtime ## _extra); \ 479 } while (0) 480 481 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 482 do { \ 483 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 484 (einode)->xtime.tv_sec = \ 485 (signed)le32_to_cpu((raw_inode)->xtime); \ 486 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 487 ext4_decode_extra_time(&(einode)->xtime, \ 488 raw_inode->xtime ## _extra); \ 489 } while (0) 490 491 #define i_disk_version osd1.linux1.l_i_version 492 493 #if defined(__KERNEL__) || defined(__linux__) 494 #define i_reserved1 osd1.linux1.l_i_reserved1 495 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 496 #define i_blocks_high osd2.linux2.l_i_blocks_high 497 #define i_uid_low i_uid 498 #define i_gid_low i_gid 499 #define i_uid_high osd2.linux2.l_i_uid_high 500 #define i_gid_high osd2.linux2.l_i_gid_high 501 #define i_reserved2 osd2.linux2.l_i_reserved2 502 503 #elif defined(__GNU__) 504 505 #define i_translator osd1.hurd1.h_i_translator 506 #define i_uid_high osd2.hurd2.h_i_uid_high 507 #define i_gid_high osd2.hurd2.h_i_gid_high 508 #define i_author osd2.hurd2.h_i_author 509 510 #elif defined(__masix__) 511 512 #define i_reserved1 osd1.masix1.m_i_reserved1 513 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 514 #define i_reserved2 osd2.masix2.m_i_reserved2 515 516 #endif /* defined(__KERNEL__) || defined(__linux__) */ 517 518 /* 519 * File system states 520 */ 521 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 522 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 523 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 524 525 /* 526 * Misc. filesystem flags 527 */ 528 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 529 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 530 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 531 532 /* 533 * Mount flags 534 */ 535 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 536 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 537 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 538 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 539 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 540 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 541 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 542 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 543 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ 544 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 545 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 546 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 547 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 548 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 549 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 550 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 551 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 552 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 553 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 554 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 555 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 556 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 557 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 558 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 559 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 560 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 561 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 562 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 563 564 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ 565 #ifndef _LINUX_EXT2_FS_H 566 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 567 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 568 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 569 EXT4_MOUNT_##opt) 570 #else 571 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD 572 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT 573 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS 574 #endif 575 576 #define ext4_set_bit ext2_set_bit 577 #define ext4_set_bit_atomic ext2_set_bit_atomic 578 #define ext4_clear_bit ext2_clear_bit 579 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 580 #define ext4_test_bit ext2_test_bit 581 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 582 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 583 #define ext4_find_next_bit ext2_find_next_bit 584 585 /* 586 * Maximal mount counts between two filesystem checks 587 */ 588 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 589 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 590 591 /* 592 * Behaviour when detecting errors 593 */ 594 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 595 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 596 #define EXT4_ERRORS_PANIC 3 /* Panic */ 597 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 598 599 /* 600 * Structure of the super block 601 */ 602 struct ext4_super_block { 603 /*00*/ __le32 s_inodes_count; /* Inodes count */ 604 __le32 s_blocks_count_lo; /* Blocks count */ 605 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 606 __le32 s_free_blocks_count_lo; /* Free blocks count */ 607 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 608 __le32 s_first_data_block; /* First Data Block */ 609 __le32 s_log_block_size; /* Block size */ 610 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 611 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 612 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 613 __le32 s_inodes_per_group; /* # Inodes per group */ 614 __le32 s_mtime; /* Mount time */ 615 /*30*/ __le32 s_wtime; /* Write time */ 616 __le16 s_mnt_count; /* Mount count */ 617 __le16 s_max_mnt_count; /* Maximal mount count */ 618 __le16 s_magic; /* Magic signature */ 619 __le16 s_state; /* File system state */ 620 __le16 s_errors; /* Behaviour when detecting errors */ 621 __le16 s_minor_rev_level; /* minor revision level */ 622 /*40*/ __le32 s_lastcheck; /* time of last check */ 623 __le32 s_checkinterval; /* max. time between checks */ 624 __le32 s_creator_os; /* OS */ 625 __le32 s_rev_level; /* Revision level */ 626 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 627 __le16 s_def_resgid; /* Default gid for reserved blocks */ 628 /* 629 * These fields are for EXT4_DYNAMIC_REV superblocks only. 630 * 631 * Note: the difference between the compatible feature set and 632 * the incompatible feature set is that if there is a bit set 633 * in the incompatible feature set that the kernel doesn't 634 * know about, it should refuse to mount the filesystem. 635 * 636 * e2fsck's requirements are more strict; if it doesn't know 637 * about a feature in either the compatible or incompatible 638 * feature set, it must abort and not try to meddle with 639 * things it doesn't understand... 640 */ 641 __le32 s_first_ino; /* First non-reserved inode */ 642 __le16 s_inode_size; /* size of inode structure */ 643 __le16 s_block_group_nr; /* block group # of this superblock */ 644 __le32 s_feature_compat; /* compatible feature set */ 645 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 646 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 647 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 648 /*78*/ char s_volume_name[16]; /* volume name */ 649 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 650 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 651 /* 652 * Performance hints. Directory preallocation should only 653 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 654 */ 655 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 656 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 657 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 658 /* 659 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 660 */ 661 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 662 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 663 __le32 s_journal_dev; /* device number of journal file */ 664 __le32 s_last_orphan; /* start of list of inodes to delete */ 665 __le32 s_hash_seed[4]; /* HTREE hash seed */ 666 __u8 s_def_hash_version; /* Default hash version to use */ 667 __u8 s_reserved_char_pad; 668 __le16 s_desc_size; /* size of group descriptor */ 669 /*100*/ __le32 s_default_mount_opts; 670 __le32 s_first_meta_bg; /* First metablock block group */ 671 __le32 s_mkfs_time; /* When the filesystem was created */ 672 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 673 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 674 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 675 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 676 __le32 s_free_blocks_count_hi; /* Free blocks count */ 677 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 678 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 679 __le32 s_flags; /* Miscellaneous flags */ 680 __le16 s_raid_stride; /* RAID stride */ 681 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 682 __le64 s_mmp_block; /* Block for multi-mount protection */ 683 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 684 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 685 __u8 s_reserved_char_pad2; 686 __le16 s_reserved_pad; 687 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 688 __u32 s_reserved[160]; /* Padding to the end of the block */ 689 }; 690 691 #ifdef __KERNEL__ 692 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 693 { 694 return sb->s_fs_info; 695 } 696 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 697 { 698 return container_of(inode, struct ext4_inode_info, vfs_inode); 699 } 700 701 static inline struct timespec ext4_current_time(struct inode *inode) 702 { 703 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 704 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 705 } 706 707 708 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 709 { 710 return ino == EXT4_ROOT_INO || 711 ino == EXT4_JOURNAL_INO || 712 ino == EXT4_RESIZE_INO || 713 (ino >= EXT4_FIRST_INO(sb) && 714 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 715 } 716 #else 717 /* Assume that user mode programs are passing in an ext4fs superblock, not 718 * a kernel struct super_block. This will allow us to call the feature-test 719 * macros from user land. */ 720 #define EXT4_SB(sb) (sb) 721 #endif 722 723 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 724 725 /* 726 * Codes for operating systems 727 */ 728 #define EXT4_OS_LINUX 0 729 #define EXT4_OS_HURD 1 730 #define EXT4_OS_MASIX 2 731 #define EXT4_OS_FREEBSD 3 732 #define EXT4_OS_LITES 4 733 734 /* 735 * Revision levels 736 */ 737 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 738 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 739 740 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 741 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 742 743 #define EXT4_GOOD_OLD_INODE_SIZE 128 744 745 /* 746 * Feature set definitions 747 */ 748 749 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 750 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 751 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 752 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 753 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 754 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 755 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 756 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 757 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 758 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 759 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 760 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 761 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 762 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 763 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 764 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 765 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 766 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 767 768 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 769 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 770 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 771 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 772 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 773 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 774 775 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 776 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 777 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 778 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 779 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 780 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 781 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 782 783 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 784 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 785 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 786 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 787 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 788 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 789 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 790 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 791 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 792 793 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 794 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 795 EXT4_FEATURE_INCOMPAT_RECOVER| \ 796 EXT4_FEATURE_INCOMPAT_META_BG| \ 797 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 798 EXT4_FEATURE_INCOMPAT_64BIT| \ 799 EXT4_FEATURE_INCOMPAT_FLEX_BG) 800 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 801 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 802 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 803 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 804 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 805 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 806 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 807 808 /* 809 * Default values for user and/or group using reserved blocks 810 */ 811 #define EXT4_DEF_RESUID 0 812 #define EXT4_DEF_RESGID 0 813 814 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 815 816 /* 817 * Default mount options 818 */ 819 #define EXT4_DEFM_DEBUG 0x0001 820 #define EXT4_DEFM_BSDGROUPS 0x0002 821 #define EXT4_DEFM_XATTR_USER 0x0004 822 #define EXT4_DEFM_ACL 0x0008 823 #define EXT4_DEFM_UID16 0x0010 824 #define EXT4_DEFM_JMODE 0x0060 825 #define EXT4_DEFM_JMODE_DATA 0x0020 826 #define EXT4_DEFM_JMODE_ORDERED 0x0040 827 #define EXT4_DEFM_JMODE_WBACK 0x0060 828 829 /* 830 * Default journal batch times 831 */ 832 #define EXT4_DEF_MIN_BATCH_TIME 0 833 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 834 835 /* 836 * Minimum number of groups in a flexgroup before we separate out 837 * directories into the first block group of a flexgroup 838 */ 839 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 840 841 /* 842 * Structure of a directory entry 843 */ 844 #define EXT4_NAME_LEN 255 845 846 struct ext4_dir_entry { 847 __le32 inode; /* Inode number */ 848 __le16 rec_len; /* Directory entry length */ 849 __le16 name_len; /* Name length */ 850 char name[EXT4_NAME_LEN]; /* File name */ 851 }; 852 853 /* 854 * The new version of the directory entry. Since EXT4 structures are 855 * stored in intel byte order, and the name_len field could never be 856 * bigger than 255 chars, it's safe to reclaim the extra byte for the 857 * file_type field. 858 */ 859 struct ext4_dir_entry_2 { 860 __le32 inode; /* Inode number */ 861 __le16 rec_len; /* Directory entry length */ 862 __u8 name_len; /* Name length */ 863 __u8 file_type; 864 char name[EXT4_NAME_LEN]; /* File name */ 865 }; 866 867 /* 868 * Ext4 directory file types. Only the low 3 bits are used. The 869 * other bits are reserved for now. 870 */ 871 #define EXT4_FT_UNKNOWN 0 872 #define EXT4_FT_REG_FILE 1 873 #define EXT4_FT_DIR 2 874 #define EXT4_FT_CHRDEV 3 875 #define EXT4_FT_BLKDEV 4 876 #define EXT4_FT_FIFO 5 877 #define EXT4_FT_SOCK 6 878 #define EXT4_FT_SYMLINK 7 879 880 #define EXT4_FT_MAX 8 881 882 /* 883 * EXT4_DIR_PAD defines the directory entries boundaries 884 * 885 * NOTE: It must be a multiple of 4 886 */ 887 #define EXT4_DIR_PAD 4 888 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 889 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 890 ~EXT4_DIR_ROUND) 891 #define EXT4_MAX_REC_LEN ((1<<16)-1) 892 893 /* 894 * Hash Tree Directory indexing 895 * (c) Daniel Phillips, 2001 896 */ 897 898 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 899 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 900 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 901 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 902 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 903 904 /* Legal values for the dx_root hash_version field: */ 905 906 #define DX_HASH_LEGACY 0 907 #define DX_HASH_HALF_MD4 1 908 #define DX_HASH_TEA 2 909 #define DX_HASH_LEGACY_UNSIGNED 3 910 #define DX_HASH_HALF_MD4_UNSIGNED 4 911 #define DX_HASH_TEA_UNSIGNED 5 912 913 #ifdef __KERNEL__ 914 915 /* hash info structure used by the directory hash */ 916 struct dx_hash_info 917 { 918 u32 hash; 919 u32 minor_hash; 920 int hash_version; 921 u32 *seed; 922 }; 923 924 #define EXT4_HTREE_EOF 0x7fffffff 925 926 /* 927 * Control parameters used by ext4_htree_next_block 928 */ 929 #define HASH_NB_ALWAYS 1 930 931 932 /* 933 * Describe an inode's exact location on disk and in memory 934 */ 935 struct ext4_iloc 936 { 937 struct buffer_head *bh; 938 unsigned long offset; 939 ext4_group_t block_group; 940 }; 941 942 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 943 { 944 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 945 } 946 947 /* 948 * This structure is stuffed into the struct file's private_data field 949 * for directories. It is where we put information so that we can do 950 * readdir operations in hash tree order. 951 */ 952 struct dir_private_info { 953 struct rb_root root; 954 struct rb_node *curr_node; 955 struct fname *extra_fname; 956 loff_t last_pos; 957 __u32 curr_hash; 958 __u32 curr_minor_hash; 959 __u32 next_hash; 960 }; 961 962 /* calculate the first block number of the group */ 963 static inline ext4_fsblk_t 964 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 965 { 966 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 967 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 968 } 969 970 /* 971 * Special error return code only used by dx_probe() and its callers. 972 */ 973 #define ERR_BAD_DX_DIR -75000 974 975 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 976 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 977 978 extern struct proc_dir_entry *ext4_proc_root; 979 980 /* 981 * Function prototypes 982 */ 983 984 /* 985 * Ok, these declarations are also in <linux/kernel.h> but none of the 986 * ext4 source programs needs to include it so they are duplicated here. 987 */ 988 # define NORET_TYPE /**/ 989 # define ATTRIB_NORET __attribute__((noreturn)) 990 # define NORET_AND noreturn, 991 992 /* bitmap.c */ 993 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 994 995 /* balloc.c */ 996 extern unsigned int ext4_block_group(struct super_block *sb, 997 ext4_fsblk_t blocknr); 998 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 999 ext4_fsblk_t blocknr); 1000 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1001 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1002 ext4_group_t group); 1003 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1004 ext4_fsblk_t goal, 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_add_groupblocks(handle_t *handle, struct super_block *sb, 1010 ext4_fsblk_t block, unsigned long count); 1011 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1012 extern void ext4_check_blocks_bitmap(struct super_block *); 1013 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1014 ext4_group_t block_group, 1015 struct buffer_head ** bh); 1016 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1017 1018 /* dir.c */ 1019 extern int ext4_check_dir_entry(const char *, struct inode *, 1020 struct ext4_dir_entry_2 *, 1021 struct buffer_head *, unsigned int); 1022 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1023 __u32 minor_hash, 1024 struct ext4_dir_entry_2 *dirent); 1025 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1026 1027 /* fsync.c */ 1028 extern int ext4_sync_file(struct file *, struct dentry *, int); 1029 1030 /* hash.c */ 1031 extern int ext4fs_dirhash(const char *name, int len, struct 1032 dx_hash_info *hinfo); 1033 1034 /* ialloc.c */ 1035 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int); 1036 extern void ext4_free_inode(handle_t *, struct inode *); 1037 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1038 extern unsigned long ext4_count_free_inodes(struct super_block *); 1039 extern unsigned long ext4_count_dirs(struct super_block *); 1040 extern void ext4_check_inodes_bitmap(struct super_block *); 1041 1042 /* mballoc.c */ 1043 extern long ext4_mb_stats; 1044 extern long ext4_mb_max_to_scan; 1045 extern int ext4_mb_init(struct super_block *, int); 1046 extern int ext4_mb_release(struct super_block *); 1047 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1048 struct ext4_allocation_request *, int *); 1049 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1050 extern void ext4_discard_preallocations(struct inode *); 1051 extern int __init init_ext4_mballoc(void); 1052 extern void exit_ext4_mballoc(void); 1053 extern void ext4_mb_free_blocks(handle_t *, struct inode *, 1054 unsigned long, unsigned long, int, unsigned long *); 1055 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1056 ext4_group_t i, struct ext4_group_desc *desc); 1057 extern void ext4_mb_update_group_info(struct ext4_group_info *grp, 1058 ext4_grpblk_t add); 1059 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1060 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1061 ext4_group_t, int); 1062 /* inode.c */ 1063 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 1064 struct buffer_head *bh, ext4_fsblk_t blocknr); 1065 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1066 ext4_lblk_t, int, int *); 1067 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1068 ext4_lblk_t, int, int *); 1069 int ext4_get_block(struct inode *inode, sector_t iblock, 1070 struct buffer_head *bh_result, int create); 1071 1072 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1073 extern int ext4_write_inode(struct inode *, int); 1074 extern int ext4_setattr(struct dentry *, struct iattr *); 1075 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1076 struct kstat *stat); 1077 extern void ext4_delete_inode(struct inode *); 1078 extern int ext4_sync_inode(handle_t *, struct inode *); 1079 extern void ext4_dirty_inode(struct inode *); 1080 extern int ext4_change_inode_journal_flag(struct inode *, int); 1081 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1082 extern int ext4_can_truncate(struct inode *inode); 1083 extern void ext4_truncate(struct inode *); 1084 extern void ext4_set_inode_flags(struct inode *); 1085 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1086 extern int ext4_alloc_da_blocks(struct inode *inode); 1087 extern void ext4_set_aops(struct inode *inode); 1088 extern int ext4_writepage_trans_blocks(struct inode *); 1089 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1090 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1091 extern int ext4_block_truncate_page(handle_t *handle, 1092 struct address_space *mapping, loff_t from); 1093 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1094 extern qsize_t ext4_get_reserved_space(struct inode *inode); 1095 1096 /* ioctl.c */ 1097 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1098 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1099 1100 /* migrate.c */ 1101 extern int ext4_ext_migrate(struct inode *); 1102 1103 /* namei.c */ 1104 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 1105 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 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_grp_locked_error(struct super_block *, ext4_group_t, 1127 const char *, const char *, ...) 1128 __attribute__ ((format (printf, 4, 5))); 1129 extern void ext4_update_dynamic_rev(struct super_block *sb); 1130 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1131 __u32 compat); 1132 extern int ext4_update_rocompat_feature(handle_t *handle, 1133 struct super_block *sb, __u32 rocompat); 1134 extern int ext4_update_incompat_feature(handle_t *handle, 1135 struct super_block *sb, __u32 incompat); 1136 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1137 struct ext4_group_desc *bg); 1138 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1139 struct ext4_group_desc *bg); 1140 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1141 struct ext4_group_desc *bg); 1142 extern __u32 ext4_free_blks_count(struct super_block *sb, 1143 struct ext4_group_desc *bg); 1144 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1145 struct ext4_group_desc *bg); 1146 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1147 struct ext4_group_desc *bg); 1148 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1149 struct ext4_group_desc *bg); 1150 extern void ext4_block_bitmap_set(struct super_block *sb, 1151 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1152 extern void ext4_inode_bitmap_set(struct super_block *sb, 1153 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1154 extern void ext4_inode_table_set(struct super_block *sb, 1155 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1156 extern void ext4_free_blks_set(struct super_block *sb, 1157 struct ext4_group_desc *bg, __u32 count); 1158 extern void ext4_free_inodes_set(struct super_block *sb, 1159 struct ext4_group_desc *bg, __u32 count); 1160 extern void ext4_used_dirs_set(struct super_block *sb, 1161 struct ext4_group_desc *bg, __u32 count); 1162 extern void ext4_itable_unused_set(struct super_block *sb, 1163 struct ext4_group_desc *bg, __u32 count); 1164 1165 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1166 { 1167 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1168 le32_to_cpu(es->s_blocks_count_lo); 1169 } 1170 1171 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1172 { 1173 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1174 le32_to_cpu(es->s_r_blocks_count_lo); 1175 } 1176 1177 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1178 { 1179 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1180 le32_to_cpu(es->s_free_blocks_count_lo); 1181 } 1182 1183 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1184 ext4_fsblk_t blk) 1185 { 1186 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1187 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1188 } 1189 1190 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1191 ext4_fsblk_t blk) 1192 { 1193 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1194 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1195 } 1196 1197 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1198 ext4_fsblk_t blk) 1199 { 1200 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1201 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1202 } 1203 1204 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1205 { 1206 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1207 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1208 le32_to_cpu(raw_inode->i_size_lo); 1209 else 1210 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1211 } 1212 1213 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1214 { 1215 raw_inode->i_size_lo = cpu_to_le32(i_size); 1216 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1217 } 1218 1219 static inline 1220 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1221 ext4_group_t group) 1222 { 1223 struct ext4_group_info ***grp_info; 1224 long indexv, indexh; 1225 grp_info = EXT4_SB(sb)->s_group_info; 1226 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1227 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1228 return grp_info[indexv][indexh]; 1229 } 1230 1231 1232 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1233 ext4_group_t block_group) 1234 { 1235 return block_group >> sbi->s_log_groups_per_flex; 1236 } 1237 1238 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1239 { 1240 return 1 << sbi->s_log_groups_per_flex; 1241 } 1242 1243 #define ext4_std_error(sb, errno) \ 1244 do { \ 1245 if ((errno)) \ 1246 __ext4_std_error((sb), __func__, (errno)); \ 1247 } while (0) 1248 1249 #ifdef CONFIG_SMP 1250 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1251 * counters. So we need to make sure we have free blocks more 1252 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1253 */ 1254 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1255 #else 1256 #define EXT4_FREEBLOCKS_WATERMARK 0 1257 #endif 1258 1259 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1260 { 1261 /* 1262 * XXX: replace with spinlock if seen contended -bzzz 1263 */ 1264 down_write(&EXT4_I(inode)->i_data_sem); 1265 if (newsize > EXT4_I(inode)->i_disksize) 1266 EXT4_I(inode)->i_disksize = newsize; 1267 up_write(&EXT4_I(inode)->i_data_sem); 1268 return ; 1269 } 1270 1271 struct ext4_group_info { 1272 unsigned long bb_state; 1273 struct rb_root bb_free_root; 1274 unsigned short bb_first_free; 1275 unsigned short bb_free; 1276 unsigned short bb_fragments; 1277 struct list_head bb_prealloc_list; 1278 #ifdef DOUBLE_CHECK 1279 void *bb_bitmap; 1280 #endif 1281 struct rw_semaphore alloc_sem; 1282 unsigned short bb_counters[]; 1283 }; 1284 1285 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1286 #define EXT4_GROUP_INFO_LOCKED_BIT 1 1287 1288 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1289 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1290 1291 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1292 { 1293 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1294 1295 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); 1296 } 1297 1298 static inline void ext4_unlock_group(struct super_block *sb, 1299 ext4_group_t group) 1300 { 1301 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1302 1303 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); 1304 } 1305 1306 static inline int ext4_is_group_locked(struct super_block *sb, 1307 ext4_group_t group) 1308 { 1309 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1310 1311 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT, 1312 &(grinfo->bb_state)); 1313 } 1314 1315 /* 1316 * Inodes and files operations 1317 */ 1318 1319 /* dir.c */ 1320 extern const struct file_operations ext4_dir_operations; 1321 1322 /* file.c */ 1323 extern const struct inode_operations ext4_file_inode_operations; 1324 extern const struct file_operations ext4_file_operations; 1325 1326 /* namei.c */ 1327 extern const struct inode_operations ext4_dir_inode_operations; 1328 extern const struct inode_operations ext4_special_inode_operations; 1329 1330 /* symlink.c */ 1331 extern const struct inode_operations ext4_symlink_inode_operations; 1332 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1333 1334 /* extents.c */ 1335 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1336 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1337 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1338 int chunk); 1339 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1340 ext4_lblk_t iblock, unsigned int max_blocks, 1341 struct buffer_head *bh_result, 1342 int create, int extend_disksize); 1343 extern void ext4_ext_truncate(struct inode *); 1344 extern void ext4_ext_init(struct super_block *); 1345 extern void ext4_ext_release(struct super_block *); 1346 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1347 loff_t len); 1348 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, 1349 sector_t block, unsigned int max_blocks, 1350 struct buffer_head *bh, int create, 1351 int extend_disksize, int flag); 1352 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1353 __u64 start, __u64 len); 1354 1355 /* 1356 * Add new method to test wether block and inode bitmaps are properly 1357 * initialized. With uninit_bg reading the block from disk is not enough 1358 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1359 */ 1360 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1361 1362 static inline int bitmap_uptodate(struct buffer_head *bh) 1363 { 1364 return (buffer_uptodate(bh) && 1365 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1366 } 1367 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1368 { 1369 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1370 } 1371 1372 #endif /* __KERNEL__ */ 1373 1374 #endif /* _EXT4_H */ 1375