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 <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 29 /* 30 * The fourth extended filesystem constants/structures 31 */ 32 33 /* 34 * Define EXT4FS_DEBUG to produce debug messages 35 */ 36 #undef EXT4FS_DEBUG 37 38 /* 39 * Debug code 40 */ 41 #ifdef EXT4FS_DEBUG 42 #define ext4_debug(f, a...) \ 43 do { \ 44 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 45 __FILE__, __LINE__, __func__); \ 46 printk(KERN_DEBUG f, ## a); \ 47 } while (0) 48 #else 49 #define ext4_debug(f, a...) do {} while (0) 50 #endif 51 52 /* data type for block offset of block group */ 53 typedef int ext4_grpblk_t; 54 55 /* data type for filesystem-wide blocks number */ 56 typedef unsigned long long ext4_fsblk_t; 57 58 /* data type for file logical block number */ 59 typedef __u32 ext4_lblk_t; 60 61 /* data type for block group number */ 62 typedef unsigned int ext4_group_t; 63 64 65 /* prefer goal again. length */ 66 #define EXT4_MB_HINT_MERGE 1 67 /* blocks already reserved */ 68 #define EXT4_MB_HINT_RESERVED 2 69 /* metadata is being allocated */ 70 #define EXT4_MB_HINT_METADATA 4 71 /* first blocks in the file */ 72 #define EXT4_MB_HINT_FIRST 8 73 /* search for the best chunk */ 74 #define EXT4_MB_HINT_BEST 16 75 /* data is being allocated */ 76 #define EXT4_MB_HINT_DATA 32 77 /* don't preallocate (for tails) */ 78 #define EXT4_MB_HINT_NOPREALLOC 64 79 /* allocate for locality group */ 80 #define EXT4_MB_HINT_GROUP_ALLOC 128 81 /* allocate goal blocks or none */ 82 #define EXT4_MB_HINT_GOAL_ONLY 256 83 /* goal is meaningful */ 84 #define EXT4_MB_HINT_TRY_GOAL 512 85 /* blocks already pre-reserved by delayed allocation */ 86 #define EXT4_MB_DELALLOC_RESERVED 1024 87 88 89 struct ext4_allocation_request { 90 /* target inode for block we're allocating */ 91 struct inode *inode; 92 /* logical block in target inode */ 93 ext4_lblk_t logical; 94 /* phys. target (a hint) */ 95 ext4_fsblk_t goal; 96 /* the closest logical allocated block to the left */ 97 ext4_lblk_t lleft; 98 /* phys. block for ^^^ */ 99 ext4_fsblk_t pleft; 100 /* the closest logical allocated block to the right */ 101 ext4_lblk_t lright; 102 /* phys. block for ^^^ */ 103 ext4_fsblk_t pright; 104 /* how many blocks we want to allocate */ 105 unsigned int len; 106 /* flags. see above EXT4_MB_HINT_* */ 107 unsigned int flags; 108 }; 109 110 /* 111 * Special inodes numbers 112 */ 113 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 114 #define EXT4_ROOT_INO 2 /* Root inode */ 115 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 116 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 117 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 118 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 119 120 /* First non-reserved inode for old ext4 filesystems */ 121 #define EXT4_GOOD_OLD_FIRST_INO 11 122 123 /* 124 * Maximal count of links to a file 125 */ 126 #define EXT4_LINK_MAX 65000 127 128 /* 129 * Macro-instructions used to manage several block sizes 130 */ 131 #define EXT4_MIN_BLOCK_SIZE 1024 132 #define EXT4_MAX_BLOCK_SIZE 65536 133 #define EXT4_MIN_BLOCK_LOG_SIZE 10 134 #ifdef __KERNEL__ 135 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 136 #else 137 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 138 #endif 139 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 140 #ifdef __KERNEL__ 141 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 142 #else 143 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 144 #endif 145 #ifdef __KERNEL__ 146 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 147 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 148 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 149 #else 150 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 151 EXT4_GOOD_OLD_INODE_SIZE : \ 152 (s)->s_inode_size) 153 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 154 EXT4_GOOD_OLD_FIRST_INO : \ 155 (s)->s_first_ino) 156 #endif 157 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 158 159 /* 160 * Structure of a blocks group descriptor 161 */ 162 struct ext4_group_desc 163 { 164 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 165 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 166 __le32 bg_inode_table_lo; /* Inodes table block */ 167 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 168 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 169 __le16 bg_used_dirs_count_lo; /* Directories count */ 170 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 171 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 172 __le16 bg_itable_unused_lo; /* Unused inodes count */ 173 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 174 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 175 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 176 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 177 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 178 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 179 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 180 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 181 __u32 bg_reserved2[3]; 182 }; 183 184 /* 185 * Structure of a flex block group info 186 */ 187 188 struct flex_groups { 189 atomic_t free_inodes; 190 atomic_t free_blocks; 191 atomic_t used_dirs; 192 }; 193 194 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 195 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 196 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 197 198 #ifdef __KERNEL__ 199 #include "ext4_sb.h" 200 #endif 201 /* 202 * Macro-instructions used to manage group descriptors 203 */ 204 #define EXT4_MIN_DESC_SIZE 32 205 #define EXT4_MIN_DESC_SIZE_64BIT 64 206 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 207 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 208 #ifdef __KERNEL__ 209 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 210 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 211 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 212 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 213 #else 214 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 215 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 216 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 217 #endif 218 219 /* 220 * Constants relative to the data blocks 221 */ 222 #define EXT4_NDIR_BLOCKS 12 223 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 224 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 225 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 226 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 227 228 /* 229 * Inode flags 230 */ 231 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 232 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 233 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 234 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 235 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 236 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 237 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 238 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 239 /* Reserved for compression usage... */ 240 #define EXT4_DIRTY_FL 0x00000100 241 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 242 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 243 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 244 /* End compression flags --- maybe not all used */ 245 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 246 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 247 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 248 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 249 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 250 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 251 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 252 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 253 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ 254 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 255 256 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 257 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ 258 259 /* Flags that should be inherited by new inodes from their parent. */ 260 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 261 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 262 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 263 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 264 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 265 266 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 267 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 268 269 /* Flags that are appropriate for non-directories/regular files. */ 270 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 271 272 /* Mask out flags that are inappropriate for the given type of inode. */ 273 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 274 { 275 if (S_ISDIR(mode)) 276 return flags; 277 else if (S_ISREG(mode)) 278 return flags & EXT4_REG_FLMASK; 279 else 280 return flags & EXT4_OTHER_FLMASK; 281 } 282 283 /* 284 * Inode dynamic state flags 285 */ 286 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 287 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 288 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 289 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 290 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ 291 292 /* Used to pass group descriptor data when online resize is done */ 293 struct ext4_new_group_input { 294 __u32 group; /* Group number for this data */ 295 __u64 block_bitmap; /* Absolute block number of block bitmap */ 296 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 297 __u64 inode_table; /* Absolute block number of inode table start */ 298 __u32 blocks_count; /* Total number of blocks in this group */ 299 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 300 __u16 unused; 301 }; 302 303 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 304 struct ext4_new_group_data { 305 __u32 group; 306 __u64 block_bitmap; 307 __u64 inode_bitmap; 308 __u64 inode_table; 309 __u32 blocks_count; 310 __u16 reserved_blocks; 311 __u16 unused; 312 __u32 free_blocks_count; 313 }; 314 315 /* 316 * Following is used by preallocation code to tell get_blocks() that we 317 * want uninitialzed extents. 318 */ 319 #define EXT4_CREATE_UNINITIALIZED_EXT 2 320 321 /* 322 * ioctl commands 323 */ 324 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 325 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 326 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 327 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 328 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 329 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 330 #ifdef CONFIG_JBD2_DEBUG 331 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 332 #endif 333 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 334 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 335 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 336 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 337 #define EXT4_IOC_MIGRATE _IO('f', 9) 338 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 339 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 340 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 341 342 /* 343 * ioctl commands in 32 bit emulation 344 */ 345 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 346 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 347 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 348 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 349 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 350 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 351 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 352 #ifdef CONFIG_JBD2_DEBUG 353 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 354 #endif 355 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 356 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 357 358 359 /* 360 * Mount options 361 */ 362 struct ext4_mount_options { 363 unsigned long s_mount_opt; 364 uid_t s_resuid; 365 gid_t s_resgid; 366 unsigned long s_commit_interval; 367 u32 s_min_batch_time, s_max_batch_time; 368 #ifdef CONFIG_QUOTA 369 int s_jquota_fmt; 370 char *s_qf_names[MAXQUOTAS]; 371 #endif 372 }; 373 374 /* 375 * Structure of an inode on the disk 376 */ 377 struct ext4_inode { 378 __le16 i_mode; /* File mode */ 379 __le16 i_uid; /* Low 16 bits of Owner Uid */ 380 __le32 i_size_lo; /* Size in bytes */ 381 __le32 i_atime; /* Access time */ 382 __le32 i_ctime; /* Inode Change time */ 383 __le32 i_mtime; /* Modification time */ 384 __le32 i_dtime; /* Deletion Time */ 385 __le16 i_gid; /* Low 16 bits of Group Id */ 386 __le16 i_links_count; /* Links count */ 387 __le32 i_blocks_lo; /* Blocks count */ 388 __le32 i_flags; /* File flags */ 389 union { 390 struct { 391 __le32 l_i_version; 392 } linux1; 393 struct { 394 __u32 h_i_translator; 395 } hurd1; 396 struct { 397 __u32 m_i_reserved1; 398 } masix1; 399 } osd1; /* OS dependent 1 */ 400 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 401 __le32 i_generation; /* File version (for NFS) */ 402 __le32 i_file_acl_lo; /* File ACL */ 403 __le32 i_size_high; 404 __le32 i_obso_faddr; /* Obsoleted fragment address */ 405 union { 406 struct { 407 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 408 __le16 l_i_file_acl_high; 409 __le16 l_i_uid_high; /* these 2 fields */ 410 __le16 l_i_gid_high; /* were reserved2[0] */ 411 __u32 l_i_reserved2; 412 } linux2; 413 struct { 414 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 415 __u16 h_i_mode_high; 416 __u16 h_i_uid_high; 417 __u16 h_i_gid_high; 418 __u32 h_i_author; 419 } hurd2; 420 struct { 421 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 422 __le16 m_i_file_acl_high; 423 __u32 m_i_reserved2[2]; 424 } masix2; 425 } osd2; /* OS dependent 2 */ 426 __le16 i_extra_isize; 427 __le16 i_pad1; 428 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 429 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 430 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 431 __le32 i_crtime; /* File Creation time */ 432 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 433 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 434 }; 435 436 437 #define EXT4_EPOCH_BITS 2 438 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 439 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 440 441 /* 442 * Extended fields will fit into an inode if the filesystem was formatted 443 * with large inodes (-I 256 or larger) and there are not currently any EAs 444 * consuming all of the available space. For new inodes we always reserve 445 * enough space for the kernel's known extended fields, but for inodes 446 * created with an old kernel this might not have been the case. None of 447 * the extended inode fields is critical for correct filesystem operation. 448 * This macro checks if a certain field fits in the inode. Note that 449 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 450 */ 451 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 452 ((offsetof(typeof(*ext4_inode), field) + \ 453 sizeof((ext4_inode)->field)) \ 454 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 455 (einode)->i_extra_isize)) \ 456 457 static inline __le32 ext4_encode_extra_time(struct timespec *time) 458 { 459 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 460 time->tv_sec >> 32 : 0) | 461 ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 462 } 463 464 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 465 { 466 if (sizeof(time->tv_sec) > 4) 467 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 468 << 32; 469 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 470 } 471 472 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 473 do { \ 474 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 475 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 476 (raw_inode)->xtime ## _extra = \ 477 ext4_encode_extra_time(&(inode)->xtime); \ 478 } while (0) 479 480 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 481 do { \ 482 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 483 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 484 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 485 (raw_inode)->xtime ## _extra = \ 486 ext4_encode_extra_time(&(einode)->xtime); \ 487 } while (0) 488 489 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 490 do { \ 491 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 492 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 493 ext4_decode_extra_time(&(inode)->xtime, \ 494 raw_inode->xtime ## _extra); \ 495 } while (0) 496 497 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 498 do { \ 499 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 500 (einode)->xtime.tv_sec = \ 501 (signed)le32_to_cpu((raw_inode)->xtime); \ 502 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 503 ext4_decode_extra_time(&(einode)->xtime, \ 504 raw_inode->xtime ## _extra); \ 505 } while (0) 506 507 #define i_disk_version osd1.linux1.l_i_version 508 509 #if defined(__KERNEL__) || defined(__linux__) 510 #define i_reserved1 osd1.linux1.l_i_reserved1 511 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 512 #define i_blocks_high osd2.linux2.l_i_blocks_high 513 #define i_uid_low i_uid 514 #define i_gid_low i_gid 515 #define i_uid_high osd2.linux2.l_i_uid_high 516 #define i_gid_high osd2.linux2.l_i_gid_high 517 #define i_reserved2 osd2.linux2.l_i_reserved2 518 519 #elif defined(__GNU__) 520 521 #define i_translator osd1.hurd1.h_i_translator 522 #define i_uid_high osd2.hurd2.h_i_uid_high 523 #define i_gid_high osd2.hurd2.h_i_gid_high 524 #define i_author osd2.hurd2.h_i_author 525 526 #elif defined(__masix__) 527 528 #define i_reserved1 osd1.masix1.m_i_reserved1 529 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 530 #define i_reserved2 osd2.masix2.m_i_reserved2 531 532 #endif /* defined(__KERNEL__) || defined(__linux__) */ 533 534 /* 535 * storage for cached extent 536 */ 537 struct ext4_ext_cache { 538 ext4_fsblk_t ec_start; 539 ext4_lblk_t ec_block; 540 __u32 ec_len; /* must be 32bit to return holes */ 541 __u32 ec_type; 542 }; 543 544 /* 545 * fourth extended file system inode data in memory 546 */ 547 struct ext4_inode_info { 548 __le32 i_data[15]; /* unconverted */ 549 __u32 i_flags; 550 ext4_fsblk_t i_file_acl; 551 __u32 i_dtime; 552 553 /* 554 * i_block_group is the number of the block group which contains 555 * this file's inode. Constant across the lifetime of the inode, 556 * it is ued for making block allocation decisions - we try to 557 * place a file's data blocks near its inode block, and new inodes 558 * near to their parent directory's inode. 559 */ 560 ext4_group_t i_block_group; 561 __u32 i_state; /* Dynamic state flags for ext4 */ 562 563 ext4_lblk_t i_dir_start_lookup; 564 #ifdef CONFIG_EXT4_FS_XATTR 565 /* 566 * Extended attributes can be read independently of the main file 567 * data. Taking i_mutex even when reading would cause contention 568 * between readers of EAs and writers of regular file data, so 569 * instead we synchronize on xattr_sem when reading or changing 570 * EAs. 571 */ 572 struct rw_semaphore xattr_sem; 573 #endif 574 #ifdef CONFIG_EXT4_FS_POSIX_ACL 575 struct posix_acl *i_acl; 576 struct posix_acl *i_default_acl; 577 #endif 578 579 struct list_head i_orphan; /* unlinked but open inodes */ 580 581 /* 582 * i_disksize keeps track of what the inode size is ON DISK, not 583 * in memory. During truncate, i_size is set to the new size by 584 * the VFS prior to calling ext4_truncate(), but the filesystem won't 585 * set i_disksize to 0 until the truncate is actually under way. 586 * 587 * The intent is that i_disksize always represents the blocks which 588 * are used by this file. This allows recovery to restart truncate 589 * on orphans if we crash during truncate. We actually write i_disksize 590 * into the on-disk inode when writing inodes out, instead of i_size. 591 * 592 * The only time when i_disksize and i_size may be different is when 593 * a truncate is in progress. The only things which change i_disksize 594 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 595 */ 596 loff_t i_disksize; 597 598 /* 599 * i_data_sem is for serialising ext4_truncate() against 600 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 601 * data tree are chopped off during truncate. We can't do that in 602 * ext4 because whenever we perform intermediate commits during 603 * truncate, the inode and all the metadata blocks *must* be in a 604 * consistent state which allows truncation of the orphans to restart 605 * during recovery. Hence we must fix the get_block-vs-truncate race 606 * by other means, so we have i_data_sem. 607 */ 608 struct rw_semaphore i_data_sem; 609 struct inode vfs_inode; 610 struct jbd2_inode jinode; 611 612 struct ext4_ext_cache i_cached_extent; 613 /* 614 * File creation time. Its function is same as that of 615 * struct timespec i_{a,c,m}time in the generic inode. 616 */ 617 struct timespec i_crtime; 618 619 /* mballoc */ 620 struct list_head i_prealloc_list; 621 spinlock_t i_prealloc_lock; 622 623 /* ialloc */ 624 ext4_group_t i_last_alloc_group; 625 626 /* allocation reservation info for delalloc */ 627 unsigned int i_reserved_data_blocks; 628 unsigned int i_reserved_meta_blocks; 629 unsigned int i_allocated_meta_blocks; 630 unsigned short i_delalloc_reserved_flag; 631 632 /* on-disk additional length */ 633 __u16 i_extra_isize; 634 635 spinlock_t i_block_reservation_lock; 636 }; 637 638 /* 639 * File system states 640 */ 641 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 642 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 643 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 644 645 /* 646 * Misc. filesystem flags 647 */ 648 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 649 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 650 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 651 652 /* 653 * Mount flags 654 */ 655 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 656 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 657 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 658 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 659 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 660 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 661 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 662 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 663 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ 664 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 665 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 666 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 667 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 668 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 669 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 670 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 671 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 672 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 673 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 674 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 675 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 676 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 677 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 678 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 679 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 680 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 681 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 682 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 683 684 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ 685 #ifndef _LINUX_EXT2_FS_H 686 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 687 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 688 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 689 EXT4_MOUNT_##opt) 690 #else 691 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD 692 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT 693 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS 694 #endif 695 696 #define ext4_set_bit ext2_set_bit 697 #define ext4_set_bit_atomic ext2_set_bit_atomic 698 #define ext4_clear_bit ext2_clear_bit 699 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 700 #define ext4_test_bit ext2_test_bit 701 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 702 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 703 #define ext4_find_next_bit ext2_find_next_bit 704 705 /* 706 * Maximal mount counts between two filesystem checks 707 */ 708 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 709 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 710 711 /* 712 * Behaviour when detecting errors 713 */ 714 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 715 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 716 #define EXT4_ERRORS_PANIC 3 /* Panic */ 717 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 718 719 /* 720 * Structure of the super block 721 */ 722 struct ext4_super_block { 723 /*00*/ __le32 s_inodes_count; /* Inodes count */ 724 __le32 s_blocks_count_lo; /* Blocks count */ 725 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 726 __le32 s_free_blocks_count_lo; /* Free blocks count */ 727 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 728 __le32 s_first_data_block; /* First Data Block */ 729 __le32 s_log_block_size; /* Block size */ 730 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 731 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 732 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 733 __le32 s_inodes_per_group; /* # Inodes per group */ 734 __le32 s_mtime; /* Mount time */ 735 /*30*/ __le32 s_wtime; /* Write time */ 736 __le16 s_mnt_count; /* Mount count */ 737 __le16 s_max_mnt_count; /* Maximal mount count */ 738 __le16 s_magic; /* Magic signature */ 739 __le16 s_state; /* File system state */ 740 __le16 s_errors; /* Behaviour when detecting errors */ 741 __le16 s_minor_rev_level; /* minor revision level */ 742 /*40*/ __le32 s_lastcheck; /* time of last check */ 743 __le32 s_checkinterval; /* max. time between checks */ 744 __le32 s_creator_os; /* OS */ 745 __le32 s_rev_level; /* Revision level */ 746 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 747 __le16 s_def_resgid; /* Default gid for reserved blocks */ 748 /* 749 * These fields are for EXT4_DYNAMIC_REV superblocks only. 750 * 751 * Note: the difference between the compatible feature set and 752 * the incompatible feature set is that if there is a bit set 753 * in the incompatible feature set that the kernel doesn't 754 * know about, it should refuse to mount the filesystem. 755 * 756 * e2fsck's requirements are more strict; if it doesn't know 757 * about a feature in either the compatible or incompatible 758 * feature set, it must abort and not try to meddle with 759 * things it doesn't understand... 760 */ 761 __le32 s_first_ino; /* First non-reserved inode */ 762 __le16 s_inode_size; /* size of inode structure */ 763 __le16 s_block_group_nr; /* block group # of this superblock */ 764 __le32 s_feature_compat; /* compatible feature set */ 765 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 766 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 767 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 768 /*78*/ char s_volume_name[16]; /* volume name */ 769 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 770 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 771 /* 772 * Performance hints. Directory preallocation should only 773 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 774 */ 775 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 776 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 777 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 778 /* 779 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 780 */ 781 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 782 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 783 __le32 s_journal_dev; /* device number of journal file */ 784 __le32 s_last_orphan; /* start of list of inodes to delete */ 785 __le32 s_hash_seed[4]; /* HTREE hash seed */ 786 __u8 s_def_hash_version; /* Default hash version to use */ 787 __u8 s_reserved_char_pad; 788 __le16 s_desc_size; /* size of group descriptor */ 789 /*100*/ __le32 s_default_mount_opts; 790 __le32 s_first_meta_bg; /* First metablock block group */ 791 __le32 s_mkfs_time; /* When the filesystem was created */ 792 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 793 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 794 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 795 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 796 __le32 s_free_blocks_count_hi; /* Free blocks count */ 797 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 798 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 799 __le32 s_flags; /* Miscellaneous flags */ 800 __le16 s_raid_stride; /* RAID stride */ 801 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 802 __le64 s_mmp_block; /* Block for multi-mount protection */ 803 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 804 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 805 __u8 s_reserved_char_pad2; 806 __le16 s_reserved_pad; 807 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 808 __u32 s_reserved[160]; /* Padding to the end of the block */ 809 }; 810 811 #ifdef __KERNEL__ 812 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 813 { 814 return sb->s_fs_info; 815 } 816 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 817 { 818 return container_of(inode, struct ext4_inode_info, vfs_inode); 819 } 820 821 static inline struct timespec ext4_current_time(struct inode *inode) 822 { 823 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 824 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 825 } 826 827 828 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 829 { 830 return ino == EXT4_ROOT_INO || 831 ino == EXT4_JOURNAL_INO || 832 ino == EXT4_RESIZE_INO || 833 (ino >= EXT4_FIRST_INO(sb) && 834 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 835 } 836 #else 837 /* Assume that user mode programs are passing in an ext4fs superblock, not 838 * a kernel struct super_block. This will allow us to call the feature-test 839 * macros from user land. */ 840 #define EXT4_SB(sb) (sb) 841 #endif 842 843 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 844 845 /* 846 * Codes for operating systems 847 */ 848 #define EXT4_OS_LINUX 0 849 #define EXT4_OS_HURD 1 850 #define EXT4_OS_MASIX 2 851 #define EXT4_OS_FREEBSD 3 852 #define EXT4_OS_LITES 4 853 854 /* 855 * Revision levels 856 */ 857 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 858 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 859 860 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 861 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 862 863 #define EXT4_GOOD_OLD_INODE_SIZE 128 864 865 /* 866 * Feature set definitions 867 */ 868 869 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 870 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 871 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 872 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 873 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 874 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 875 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 876 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 877 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 878 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 879 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 880 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 881 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 882 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 883 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 884 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 885 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 886 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 887 888 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 889 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 890 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 891 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 892 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 893 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 894 895 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 896 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 897 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 898 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 899 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 900 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 901 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 902 903 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 904 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 905 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 906 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 907 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 908 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 909 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 910 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 911 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 912 913 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 914 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 915 EXT4_FEATURE_INCOMPAT_RECOVER| \ 916 EXT4_FEATURE_INCOMPAT_META_BG| \ 917 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 918 EXT4_FEATURE_INCOMPAT_64BIT| \ 919 EXT4_FEATURE_INCOMPAT_FLEX_BG) 920 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 921 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 922 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 923 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 924 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 925 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 926 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 927 928 /* 929 * Default values for user and/or group using reserved blocks 930 */ 931 #define EXT4_DEF_RESUID 0 932 #define EXT4_DEF_RESGID 0 933 934 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 935 936 /* 937 * Default mount options 938 */ 939 #define EXT4_DEFM_DEBUG 0x0001 940 #define EXT4_DEFM_BSDGROUPS 0x0002 941 #define EXT4_DEFM_XATTR_USER 0x0004 942 #define EXT4_DEFM_ACL 0x0008 943 #define EXT4_DEFM_UID16 0x0010 944 #define EXT4_DEFM_JMODE 0x0060 945 #define EXT4_DEFM_JMODE_DATA 0x0020 946 #define EXT4_DEFM_JMODE_ORDERED 0x0040 947 #define EXT4_DEFM_JMODE_WBACK 0x0060 948 949 /* 950 * Default journal batch times 951 */ 952 #define EXT4_DEF_MIN_BATCH_TIME 0 953 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 954 955 /* 956 * Minimum number of groups in a flexgroup before we separate out 957 * directories into the first block group of a flexgroup 958 */ 959 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 960 961 /* 962 * Structure of a directory entry 963 */ 964 #define EXT4_NAME_LEN 255 965 966 struct ext4_dir_entry { 967 __le32 inode; /* Inode number */ 968 __le16 rec_len; /* Directory entry length */ 969 __le16 name_len; /* Name length */ 970 char name[EXT4_NAME_LEN]; /* File name */ 971 }; 972 973 /* 974 * The new version of the directory entry. Since EXT4 structures are 975 * stored in intel byte order, and the name_len field could never be 976 * bigger than 255 chars, it's safe to reclaim the extra byte for the 977 * file_type field. 978 */ 979 struct ext4_dir_entry_2 { 980 __le32 inode; /* Inode number */ 981 __le16 rec_len; /* Directory entry length */ 982 __u8 name_len; /* Name length */ 983 __u8 file_type; 984 char name[EXT4_NAME_LEN]; /* File name */ 985 }; 986 987 /* 988 * Ext4 directory file types. Only the low 3 bits are used. The 989 * other bits are reserved for now. 990 */ 991 #define EXT4_FT_UNKNOWN 0 992 #define EXT4_FT_REG_FILE 1 993 #define EXT4_FT_DIR 2 994 #define EXT4_FT_CHRDEV 3 995 #define EXT4_FT_BLKDEV 4 996 #define EXT4_FT_FIFO 5 997 #define EXT4_FT_SOCK 6 998 #define EXT4_FT_SYMLINK 7 999 1000 #define EXT4_FT_MAX 8 1001 1002 /* 1003 * EXT4_DIR_PAD defines the directory entries boundaries 1004 * 1005 * NOTE: It must be a multiple of 4 1006 */ 1007 #define EXT4_DIR_PAD 4 1008 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1009 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1010 ~EXT4_DIR_ROUND) 1011 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1012 1013 /* 1014 * Hash Tree Directory indexing 1015 * (c) Daniel Phillips, 2001 1016 */ 1017 1018 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1019 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1020 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 1021 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1022 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1023 1024 /* Legal values for the dx_root hash_version field: */ 1025 1026 #define DX_HASH_LEGACY 0 1027 #define DX_HASH_HALF_MD4 1 1028 #define DX_HASH_TEA 2 1029 #define DX_HASH_LEGACY_UNSIGNED 3 1030 #define DX_HASH_HALF_MD4_UNSIGNED 4 1031 #define DX_HASH_TEA_UNSIGNED 5 1032 1033 #ifdef __KERNEL__ 1034 1035 /* hash info structure used by the directory hash */ 1036 struct dx_hash_info 1037 { 1038 u32 hash; 1039 u32 minor_hash; 1040 int hash_version; 1041 u32 *seed; 1042 }; 1043 1044 #define EXT4_HTREE_EOF 0x7fffffff 1045 1046 /* 1047 * Control parameters used by ext4_htree_next_block 1048 */ 1049 #define HASH_NB_ALWAYS 1 1050 1051 1052 /* 1053 * Describe an inode's exact location on disk and in memory 1054 */ 1055 struct ext4_iloc 1056 { 1057 struct buffer_head *bh; 1058 unsigned long offset; 1059 ext4_group_t block_group; 1060 }; 1061 1062 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1063 { 1064 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1065 } 1066 1067 /* 1068 * This structure is stuffed into the struct file's private_data field 1069 * for directories. It is where we put information so that we can do 1070 * readdir operations in hash tree order. 1071 */ 1072 struct dir_private_info { 1073 struct rb_root root; 1074 struct rb_node *curr_node; 1075 struct fname *extra_fname; 1076 loff_t last_pos; 1077 __u32 curr_hash; 1078 __u32 curr_minor_hash; 1079 __u32 next_hash; 1080 }; 1081 1082 /* calculate the first block number of the group */ 1083 static inline ext4_fsblk_t 1084 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1085 { 1086 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1087 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1088 } 1089 1090 /* 1091 * Special error return code only used by dx_probe() and its callers. 1092 */ 1093 #define ERR_BAD_DX_DIR -75000 1094 1095 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1096 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1097 1098 extern struct proc_dir_entry *ext4_proc_root; 1099 1100 /* 1101 * Function prototypes 1102 */ 1103 1104 /* 1105 * Ok, these declarations are also in <linux/kernel.h> but none of the 1106 * ext4 source programs needs to include it so they are duplicated here. 1107 */ 1108 # define NORET_TYPE /**/ 1109 # define ATTRIB_NORET __attribute__((noreturn)) 1110 # define NORET_AND noreturn, 1111 1112 /* bitmap.c */ 1113 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1114 1115 /* balloc.c */ 1116 extern unsigned int ext4_block_group(struct super_block *sb, 1117 ext4_fsblk_t blocknr); 1118 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1119 ext4_fsblk_t blocknr); 1120 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1121 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1122 ext4_group_t group); 1123 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1124 ext4_fsblk_t goal, unsigned long *count, int *errp); 1125 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1126 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1127 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1128 ext4_fsblk_t block, unsigned long count, int metadata); 1129 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1130 ext4_fsblk_t block, unsigned long count); 1131 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1132 extern void ext4_check_blocks_bitmap(struct super_block *); 1133 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1134 ext4_group_t block_group, 1135 struct buffer_head ** bh); 1136 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1137 1138 /* dir.c */ 1139 extern int ext4_check_dir_entry(const char *, struct inode *, 1140 struct ext4_dir_entry_2 *, 1141 struct buffer_head *, unsigned int); 1142 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1143 __u32 minor_hash, 1144 struct ext4_dir_entry_2 *dirent); 1145 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1146 1147 /* fsync.c */ 1148 extern int ext4_sync_file(struct file *, struct dentry *, int); 1149 1150 /* hash.c */ 1151 extern int ext4fs_dirhash(const char *name, int len, struct 1152 dx_hash_info *hinfo); 1153 1154 /* ialloc.c */ 1155 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int); 1156 extern void ext4_free_inode(handle_t *, struct inode *); 1157 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1158 extern unsigned long ext4_count_free_inodes(struct super_block *); 1159 extern unsigned long ext4_count_dirs(struct super_block *); 1160 extern void ext4_check_inodes_bitmap(struct super_block *); 1161 1162 /* mballoc.c */ 1163 extern long ext4_mb_stats; 1164 extern long ext4_mb_max_to_scan; 1165 extern int ext4_mb_init(struct super_block *, int); 1166 extern int ext4_mb_release(struct super_block *); 1167 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1168 struct ext4_allocation_request *, int *); 1169 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1170 extern void ext4_discard_preallocations(struct inode *); 1171 extern int __init init_ext4_mballoc(void); 1172 extern void exit_ext4_mballoc(void); 1173 extern void ext4_mb_free_blocks(handle_t *, struct inode *, 1174 unsigned long, unsigned long, int, unsigned long *); 1175 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1176 ext4_group_t i, struct ext4_group_desc *desc); 1177 extern void ext4_mb_update_group_info(struct ext4_group_info *grp, 1178 ext4_grpblk_t add); 1179 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1180 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1181 ext4_group_t, int); 1182 /* inode.c */ 1183 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 1184 struct buffer_head *bh, ext4_fsblk_t blocknr); 1185 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1186 ext4_lblk_t, int, int *); 1187 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1188 ext4_lblk_t, int, int *); 1189 int ext4_get_block(struct inode *inode, sector_t iblock, 1190 struct buffer_head *bh_result, int create); 1191 1192 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1193 extern int ext4_write_inode(struct inode *, int); 1194 extern int ext4_setattr(struct dentry *, struct iattr *); 1195 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1196 struct kstat *stat); 1197 extern void ext4_delete_inode(struct inode *); 1198 extern int ext4_sync_inode(handle_t *, struct inode *); 1199 extern void ext4_dirty_inode(struct inode *); 1200 extern int ext4_change_inode_journal_flag(struct inode *, int); 1201 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1202 extern int ext4_can_truncate(struct inode *inode); 1203 extern void ext4_truncate(struct inode *); 1204 extern void ext4_set_inode_flags(struct inode *); 1205 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1206 extern int ext4_alloc_da_blocks(struct inode *inode); 1207 extern void ext4_set_aops(struct inode *inode); 1208 extern int ext4_writepage_trans_blocks(struct inode *); 1209 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1210 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1211 extern int ext4_block_truncate_page(handle_t *handle, 1212 struct address_space *mapping, loff_t from); 1213 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1214 extern qsize_t ext4_get_reserved_space(struct inode *inode); 1215 1216 /* ioctl.c */ 1217 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1218 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1219 1220 /* migrate.c */ 1221 extern int ext4_ext_migrate(struct inode *); 1222 1223 /* namei.c */ 1224 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 1225 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 1226 extern int ext4_orphan_add(handle_t *, struct inode *); 1227 extern int ext4_orphan_del(handle_t *, struct inode *); 1228 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1229 __u32 start_minor_hash, __u32 *next_hash); 1230 1231 /* resize.c */ 1232 extern int ext4_group_add(struct super_block *sb, 1233 struct ext4_new_group_data *input); 1234 extern int ext4_group_extend(struct super_block *sb, 1235 struct ext4_super_block *es, 1236 ext4_fsblk_t n_blocks_count); 1237 1238 /* super.c */ 1239 extern void ext4_error(struct super_block *, const char *, const char *, ...) 1240 __attribute__ ((format (printf, 3, 4))); 1241 extern void __ext4_std_error(struct super_block *, const char *, int); 1242 extern void ext4_abort(struct super_block *, const char *, const char *, ...) 1243 __attribute__ ((format (printf, 3, 4))); 1244 extern void ext4_warning(struct super_block *, const char *, const char *, ...) 1245 __attribute__ ((format (printf, 3, 4))); 1246 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 1247 const char *, const char *, ...) 1248 __attribute__ ((format (printf, 4, 5))); 1249 extern void ext4_update_dynamic_rev(struct super_block *sb); 1250 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1251 __u32 compat); 1252 extern int ext4_update_rocompat_feature(handle_t *handle, 1253 struct super_block *sb, __u32 rocompat); 1254 extern int ext4_update_incompat_feature(handle_t *handle, 1255 struct super_block *sb, __u32 incompat); 1256 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1257 struct ext4_group_desc *bg); 1258 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1259 struct ext4_group_desc *bg); 1260 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1261 struct ext4_group_desc *bg); 1262 extern __u32 ext4_free_blks_count(struct super_block *sb, 1263 struct ext4_group_desc *bg); 1264 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1265 struct ext4_group_desc *bg); 1266 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1267 struct ext4_group_desc *bg); 1268 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1269 struct ext4_group_desc *bg); 1270 extern void ext4_block_bitmap_set(struct super_block *sb, 1271 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1272 extern void ext4_inode_bitmap_set(struct super_block *sb, 1273 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1274 extern void ext4_inode_table_set(struct super_block *sb, 1275 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1276 extern void ext4_free_blks_set(struct super_block *sb, 1277 struct ext4_group_desc *bg, __u32 count); 1278 extern void ext4_free_inodes_set(struct super_block *sb, 1279 struct ext4_group_desc *bg, __u32 count); 1280 extern void ext4_used_dirs_set(struct super_block *sb, 1281 struct ext4_group_desc *bg, __u32 count); 1282 extern void ext4_itable_unused_set(struct super_block *sb, 1283 struct ext4_group_desc *bg, __u32 count); 1284 1285 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1286 { 1287 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1288 le32_to_cpu(es->s_blocks_count_lo); 1289 } 1290 1291 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1292 { 1293 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1294 le32_to_cpu(es->s_r_blocks_count_lo); 1295 } 1296 1297 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1298 { 1299 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1300 le32_to_cpu(es->s_free_blocks_count_lo); 1301 } 1302 1303 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1304 ext4_fsblk_t blk) 1305 { 1306 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1307 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1308 } 1309 1310 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1311 ext4_fsblk_t blk) 1312 { 1313 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1314 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1315 } 1316 1317 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1318 ext4_fsblk_t blk) 1319 { 1320 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1321 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1322 } 1323 1324 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1325 { 1326 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1327 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1328 le32_to_cpu(raw_inode->i_size_lo); 1329 else 1330 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1331 } 1332 1333 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1334 { 1335 raw_inode->i_size_lo = cpu_to_le32(i_size); 1336 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1337 } 1338 1339 static inline 1340 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1341 ext4_group_t group) 1342 { 1343 struct ext4_group_info ***grp_info; 1344 long indexv, indexh; 1345 grp_info = EXT4_SB(sb)->s_group_info; 1346 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1347 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1348 return grp_info[indexv][indexh]; 1349 } 1350 1351 /* 1352 * Reading s_groups_count requires using smp_rmb() afterwards. See 1353 * the locking protocol documented in the comments of ext4_group_add() 1354 * in resize.c 1355 */ 1356 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1357 { 1358 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1359 1360 smp_rmb(); 1361 return ngroups; 1362 } 1363 1364 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1365 ext4_group_t block_group) 1366 { 1367 return block_group >> sbi->s_log_groups_per_flex; 1368 } 1369 1370 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1371 { 1372 return 1 << sbi->s_log_groups_per_flex; 1373 } 1374 1375 #define ext4_std_error(sb, errno) \ 1376 do { \ 1377 if ((errno)) \ 1378 __ext4_std_error((sb), __func__, (errno)); \ 1379 } while (0) 1380 1381 #ifdef CONFIG_SMP 1382 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1383 * counters. So we need to make sure we have free blocks more 1384 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1385 */ 1386 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1387 #else 1388 #define EXT4_FREEBLOCKS_WATERMARK 0 1389 #endif 1390 1391 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1392 { 1393 /* 1394 * XXX: replace with spinlock if seen contended -bzzz 1395 */ 1396 down_write(&EXT4_I(inode)->i_data_sem); 1397 if (newsize > EXT4_I(inode)->i_disksize) 1398 EXT4_I(inode)->i_disksize = newsize; 1399 up_write(&EXT4_I(inode)->i_data_sem); 1400 return ; 1401 } 1402 1403 struct ext4_group_info { 1404 unsigned long bb_state; 1405 struct rb_root bb_free_root; 1406 unsigned short bb_first_free; 1407 unsigned short bb_free; 1408 unsigned short bb_fragments; 1409 struct list_head bb_prealloc_list; 1410 #ifdef DOUBLE_CHECK 1411 void *bb_bitmap; 1412 #endif 1413 struct rw_semaphore alloc_sem; 1414 unsigned short bb_counters[]; 1415 }; 1416 1417 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1418 #define EXT4_GROUP_INFO_LOCKED_BIT 1 1419 1420 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1421 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1422 1423 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1424 { 1425 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1426 1427 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); 1428 } 1429 1430 static inline void ext4_unlock_group(struct super_block *sb, 1431 ext4_group_t group) 1432 { 1433 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1434 1435 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); 1436 } 1437 1438 static inline int ext4_is_group_locked(struct super_block *sb, 1439 ext4_group_t group) 1440 { 1441 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1442 1443 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT, 1444 &(grinfo->bb_state)); 1445 } 1446 1447 /* 1448 * Inodes and files operations 1449 */ 1450 1451 /* dir.c */ 1452 extern const struct file_operations ext4_dir_operations; 1453 1454 /* file.c */ 1455 extern const struct inode_operations ext4_file_inode_operations; 1456 extern const struct file_operations ext4_file_operations; 1457 1458 /* namei.c */ 1459 extern const struct inode_operations ext4_dir_inode_operations; 1460 extern const struct inode_operations ext4_special_inode_operations; 1461 1462 /* symlink.c */ 1463 extern const struct inode_operations ext4_symlink_inode_operations; 1464 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1465 1466 /* extents.c */ 1467 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1468 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1469 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1470 int chunk); 1471 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1472 ext4_lblk_t iblock, unsigned int max_blocks, 1473 struct buffer_head *bh_result, 1474 int create, int extend_disksize); 1475 extern void ext4_ext_truncate(struct inode *); 1476 extern void ext4_ext_init(struct super_block *); 1477 extern void ext4_ext_release(struct super_block *); 1478 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1479 loff_t len); 1480 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, 1481 sector_t block, unsigned int max_blocks, 1482 struct buffer_head *bh, int create, 1483 int extend_disksize, int flag); 1484 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1485 __u64 start, __u64 len); 1486 1487 /* 1488 * Add new method to test wether block and inode bitmaps are properly 1489 * initialized. With uninit_bg reading the block from disk is not enough 1490 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1491 */ 1492 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1493 1494 static inline int bitmap_uptodate(struct buffer_head *bh) 1495 { 1496 return (buffer_uptodate(bh) && 1497 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1498 } 1499 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1500 { 1501 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1502 } 1503 1504 #endif /* __KERNEL__ */ 1505 1506 #endif /* _EXT4_H */ 1507