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 #include <linux/timer.h> 29 #include <linux/wait.h> 30 #include <linux/blockgroup_lock.h> 31 #include <linux/percpu_counter.h> 32 33 /* 34 * The fourth extended filesystem constants/structures 35 */ 36 37 /* 38 * Define EXT4FS_DEBUG to produce debug messages 39 */ 40 #undef EXT4FS_DEBUG 41 42 /* 43 * Debug code 44 */ 45 #ifdef EXT4FS_DEBUG 46 #define ext4_debug(f, a...) \ 47 do { \ 48 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 49 __FILE__, __LINE__, __func__); \ 50 printk(KERN_DEBUG f, ## a); \ 51 } while (0) 52 #else 53 #define ext4_debug(f, a...) do {} while (0) 54 #endif 55 56 /* data type for block offset of block group */ 57 typedef int ext4_grpblk_t; 58 59 /* data type for filesystem-wide blocks number */ 60 typedef unsigned long long ext4_fsblk_t; 61 62 /* data type for file logical block number */ 63 typedef __u32 ext4_lblk_t; 64 65 /* data type for block group number */ 66 typedef unsigned int ext4_group_t; 67 68 69 /* prefer goal again. length */ 70 #define EXT4_MB_HINT_MERGE 1 71 /* blocks already reserved */ 72 #define EXT4_MB_HINT_RESERVED 2 73 /* metadata is being allocated */ 74 #define EXT4_MB_HINT_METADATA 4 75 /* first blocks in the file */ 76 #define EXT4_MB_HINT_FIRST 8 77 /* search for the best chunk */ 78 #define EXT4_MB_HINT_BEST 16 79 /* data is being allocated */ 80 #define EXT4_MB_HINT_DATA 32 81 /* don't preallocate (for tails) */ 82 #define EXT4_MB_HINT_NOPREALLOC 64 83 /* allocate for locality group */ 84 #define EXT4_MB_HINT_GROUP_ALLOC 128 85 /* allocate goal blocks or none */ 86 #define EXT4_MB_HINT_GOAL_ONLY 256 87 /* goal is meaningful */ 88 #define EXT4_MB_HINT_TRY_GOAL 512 89 /* blocks already pre-reserved by delayed allocation */ 90 #define EXT4_MB_DELALLOC_RESERVED 1024 91 92 93 struct ext4_allocation_request { 94 /* target inode for block we're allocating */ 95 struct inode *inode; 96 /* logical block in target inode */ 97 ext4_lblk_t logical; 98 /* phys. target (a hint) */ 99 ext4_fsblk_t goal; 100 /* the closest logical allocated block to the left */ 101 ext4_lblk_t lleft; 102 /* phys. block for ^^^ */ 103 ext4_fsblk_t pleft; 104 /* the closest logical allocated block to the right */ 105 ext4_lblk_t lright; 106 /* phys. block for ^^^ */ 107 ext4_fsblk_t pright; 108 /* how many blocks we want to allocate */ 109 unsigned int len; 110 /* flags. see above EXT4_MB_HINT_* */ 111 unsigned int flags; 112 }; 113 114 /* 115 * Special inodes numbers 116 */ 117 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 118 #define EXT4_ROOT_INO 2 /* Root inode */ 119 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 120 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 121 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 122 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 123 124 /* First non-reserved inode for old ext4 filesystems */ 125 #define EXT4_GOOD_OLD_FIRST_INO 11 126 127 /* 128 * Maximal count of links to a file 129 */ 130 #define EXT4_LINK_MAX 65000 131 132 /* 133 * Macro-instructions used to manage several block sizes 134 */ 135 #define EXT4_MIN_BLOCK_SIZE 1024 136 #define EXT4_MAX_BLOCK_SIZE 65536 137 #define EXT4_MIN_BLOCK_LOG_SIZE 10 138 #ifdef __KERNEL__ 139 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 140 #else 141 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 142 #endif 143 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 144 #ifdef __KERNEL__ 145 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 146 #else 147 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 148 #endif 149 #ifdef __KERNEL__ 150 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 151 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 152 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 153 #else 154 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 155 EXT4_GOOD_OLD_INODE_SIZE : \ 156 (s)->s_inode_size) 157 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 158 EXT4_GOOD_OLD_FIRST_INO : \ 159 (s)->s_first_ino) 160 #endif 161 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 162 163 /* 164 * Structure of a blocks group descriptor 165 */ 166 struct ext4_group_desc 167 { 168 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 169 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 170 __le32 bg_inode_table_lo; /* Inodes table block */ 171 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 172 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 173 __le16 bg_used_dirs_count_lo; /* Directories count */ 174 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 175 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 176 __le16 bg_itable_unused_lo; /* Unused inodes count */ 177 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 178 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 179 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 180 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 181 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 182 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 183 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 184 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 185 __u32 bg_reserved2[3]; 186 }; 187 188 /* 189 * Structure of a flex block group info 190 */ 191 192 struct flex_groups { 193 atomic_t free_inodes; 194 atomic_t free_blocks; 195 atomic_t used_dirs; 196 }; 197 198 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 199 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 200 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 201 202 /* 203 * Macro-instructions used to manage group descriptors 204 */ 205 #define EXT4_MIN_DESC_SIZE 32 206 #define EXT4_MIN_DESC_SIZE_64BIT 64 207 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 208 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 209 #ifdef __KERNEL__ 210 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 211 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 212 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 213 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 214 #else 215 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 216 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 217 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 218 #endif 219 220 /* 221 * Constants relative to the data blocks 222 */ 223 #define EXT4_NDIR_BLOCKS 12 224 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 225 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 226 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 227 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 228 229 /* 230 * Inode flags 231 */ 232 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 233 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 234 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 235 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 236 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 237 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 238 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 239 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 240 /* Reserved for compression usage... */ 241 #define EXT4_DIRTY_FL 0x00000100 242 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 243 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 244 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 245 /* End compression flags --- maybe not all used */ 246 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 247 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 248 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 249 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 250 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 251 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 252 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 253 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 254 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ 255 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 256 257 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 258 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ 259 260 /* Flags that should be inherited by new inodes from their parent. */ 261 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 262 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 263 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 264 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 265 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 266 267 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 268 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 269 270 /* Flags that are appropriate for non-directories/regular files. */ 271 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 272 273 /* Mask out flags that are inappropriate for the given type of inode. */ 274 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 275 { 276 if (S_ISDIR(mode)) 277 return flags; 278 else if (S_ISREG(mode)) 279 return flags & EXT4_REG_FLMASK; 280 else 281 return flags & EXT4_OTHER_FLMASK; 282 } 283 284 /* 285 * Inode dynamic state flags 286 */ 287 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 288 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 289 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 290 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 291 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ 292 293 /* Used to pass group descriptor data when online resize is done */ 294 struct ext4_new_group_input { 295 __u32 group; /* Group number for this data */ 296 __u64 block_bitmap; /* Absolute block number of block bitmap */ 297 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 298 __u64 inode_table; /* Absolute block number of inode table start */ 299 __u32 blocks_count; /* Total number of blocks in this group */ 300 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 301 __u16 unused; 302 }; 303 304 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 305 struct ext4_new_group_data { 306 __u32 group; 307 __u64 block_bitmap; 308 __u64 inode_bitmap; 309 __u64 inode_table; 310 __u32 blocks_count; 311 __u16 reserved_blocks; 312 __u16 unused; 313 __u32 free_blocks_count; 314 }; 315 316 /* 317 * Flags used by ext4_get_blocks() 318 */ 319 /* Allocate any needed blocks and/or convert an unitialized 320 extent to be an initialized ext4 */ 321 #define EXT4_GET_BLOCKS_CREATE 0x0001 322 /* Request the creation of an unitialized extent */ 323 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 324 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 325 EXT4_GET_BLOCKS_CREATE) 326 /* Update the ext4_inode_info i_disksize field */ 327 #define EXT4_GET_BLOCKS_EXTEND_DISKSIZE 0x0004 328 /* Caller is from the delayed allocation writeout path, 329 so set the magic i_delalloc_reserve_flag after taking the 330 inode allocation semaphore for */ 331 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0008 332 /* Call ext4_da_update_reserve_space() after successfully 333 allocating the blocks */ 334 #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0010 335 336 337 /* 338 * ioctl commands 339 */ 340 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 341 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 342 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 343 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 344 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 345 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 346 #ifdef CONFIG_JBD2_DEBUG 347 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 348 #endif 349 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 350 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 351 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 352 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 353 #define EXT4_IOC_MIGRATE _IO('f', 9) 354 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 355 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 356 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 357 358 /* 359 * ioctl commands in 32 bit emulation 360 */ 361 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 362 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 363 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 364 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 365 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 366 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 367 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 368 #ifdef CONFIG_JBD2_DEBUG 369 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 370 #endif 371 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 372 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 373 374 375 /* 376 * Mount options 377 */ 378 struct ext4_mount_options { 379 unsigned long s_mount_opt; 380 uid_t s_resuid; 381 gid_t s_resgid; 382 unsigned long s_commit_interval; 383 u32 s_min_batch_time, s_max_batch_time; 384 #ifdef CONFIG_QUOTA 385 int s_jquota_fmt; 386 char *s_qf_names[MAXQUOTAS]; 387 #endif 388 }; 389 390 /* 391 * Structure of an inode on the disk 392 */ 393 struct ext4_inode { 394 __le16 i_mode; /* File mode */ 395 __le16 i_uid; /* Low 16 bits of Owner Uid */ 396 __le32 i_size_lo; /* Size in bytes */ 397 __le32 i_atime; /* Access time */ 398 __le32 i_ctime; /* Inode Change time */ 399 __le32 i_mtime; /* Modification time */ 400 __le32 i_dtime; /* Deletion Time */ 401 __le16 i_gid; /* Low 16 bits of Group Id */ 402 __le16 i_links_count; /* Links count */ 403 __le32 i_blocks_lo; /* Blocks count */ 404 __le32 i_flags; /* File flags */ 405 union { 406 struct { 407 __le32 l_i_version; 408 } linux1; 409 struct { 410 __u32 h_i_translator; 411 } hurd1; 412 struct { 413 __u32 m_i_reserved1; 414 } masix1; 415 } osd1; /* OS dependent 1 */ 416 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 417 __le32 i_generation; /* File version (for NFS) */ 418 __le32 i_file_acl_lo; /* File ACL */ 419 __le32 i_size_high; 420 __le32 i_obso_faddr; /* Obsoleted fragment address */ 421 union { 422 struct { 423 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 424 __le16 l_i_file_acl_high; 425 __le16 l_i_uid_high; /* these 2 fields */ 426 __le16 l_i_gid_high; /* were reserved2[0] */ 427 __u32 l_i_reserved2; 428 } linux2; 429 struct { 430 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 431 __u16 h_i_mode_high; 432 __u16 h_i_uid_high; 433 __u16 h_i_gid_high; 434 __u32 h_i_author; 435 } hurd2; 436 struct { 437 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 438 __le16 m_i_file_acl_high; 439 __u32 m_i_reserved2[2]; 440 } masix2; 441 } osd2; /* OS dependent 2 */ 442 __le16 i_extra_isize; 443 __le16 i_pad1; 444 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 445 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 446 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 447 __le32 i_crtime; /* File Creation time */ 448 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 449 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 450 }; 451 452 453 #define EXT4_EPOCH_BITS 2 454 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 455 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 456 457 /* 458 * Extended fields will fit into an inode if the filesystem was formatted 459 * with large inodes (-I 256 or larger) and there are not currently any EAs 460 * consuming all of the available space. For new inodes we always reserve 461 * enough space for the kernel's known extended fields, but for inodes 462 * created with an old kernel this might not have been the case. None of 463 * the extended inode fields is critical for correct filesystem operation. 464 * This macro checks if a certain field fits in the inode. Note that 465 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 466 */ 467 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 468 ((offsetof(typeof(*ext4_inode), field) + \ 469 sizeof((ext4_inode)->field)) \ 470 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 471 (einode)->i_extra_isize)) \ 472 473 static inline __le32 ext4_encode_extra_time(struct timespec *time) 474 { 475 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 476 time->tv_sec >> 32 : 0) | 477 ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 478 } 479 480 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 481 { 482 if (sizeof(time->tv_sec) > 4) 483 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 484 << 32; 485 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 486 } 487 488 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 489 do { \ 490 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 491 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 492 (raw_inode)->xtime ## _extra = \ 493 ext4_encode_extra_time(&(inode)->xtime); \ 494 } while (0) 495 496 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 497 do { \ 498 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 499 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 500 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 501 (raw_inode)->xtime ## _extra = \ 502 ext4_encode_extra_time(&(einode)->xtime); \ 503 } while (0) 504 505 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 506 do { \ 507 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 508 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 509 ext4_decode_extra_time(&(inode)->xtime, \ 510 raw_inode->xtime ## _extra); \ 511 } while (0) 512 513 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 514 do { \ 515 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 516 (einode)->xtime.tv_sec = \ 517 (signed)le32_to_cpu((raw_inode)->xtime); \ 518 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 519 ext4_decode_extra_time(&(einode)->xtime, \ 520 raw_inode->xtime ## _extra); \ 521 } while (0) 522 523 #define i_disk_version osd1.linux1.l_i_version 524 525 #if defined(__KERNEL__) || defined(__linux__) 526 #define i_reserved1 osd1.linux1.l_i_reserved1 527 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 528 #define i_blocks_high osd2.linux2.l_i_blocks_high 529 #define i_uid_low i_uid 530 #define i_gid_low i_gid 531 #define i_uid_high osd2.linux2.l_i_uid_high 532 #define i_gid_high osd2.linux2.l_i_gid_high 533 #define i_reserved2 osd2.linux2.l_i_reserved2 534 535 #elif defined(__GNU__) 536 537 #define i_translator osd1.hurd1.h_i_translator 538 #define i_uid_high osd2.hurd2.h_i_uid_high 539 #define i_gid_high osd2.hurd2.h_i_gid_high 540 #define i_author osd2.hurd2.h_i_author 541 542 #elif defined(__masix__) 543 544 #define i_reserved1 osd1.masix1.m_i_reserved1 545 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 546 #define i_reserved2 osd2.masix2.m_i_reserved2 547 548 #endif /* defined(__KERNEL__) || defined(__linux__) */ 549 550 /* 551 * storage for cached extent 552 */ 553 struct ext4_ext_cache { 554 ext4_fsblk_t ec_start; 555 ext4_lblk_t ec_block; 556 __u32 ec_len; /* must be 32bit to return holes */ 557 __u32 ec_type; 558 }; 559 560 /* 561 * fourth extended file system inode data in memory 562 */ 563 struct ext4_inode_info { 564 __le32 i_data[15]; /* unconverted */ 565 __u32 i_flags; 566 ext4_fsblk_t i_file_acl; 567 __u32 i_dtime; 568 569 /* 570 * i_block_group is the number of the block group which contains 571 * this file's inode. Constant across the lifetime of the inode, 572 * it is ued for making block allocation decisions - we try to 573 * place a file's data blocks near its inode block, and new inodes 574 * near to their parent directory's inode. 575 */ 576 ext4_group_t i_block_group; 577 __u32 i_state; /* Dynamic state flags for ext4 */ 578 579 ext4_lblk_t i_dir_start_lookup; 580 #ifdef CONFIG_EXT4_FS_XATTR 581 /* 582 * Extended attributes can be read independently of the main file 583 * data. Taking i_mutex even when reading would cause contention 584 * between readers of EAs and writers of regular file data, so 585 * instead we synchronize on xattr_sem when reading or changing 586 * EAs. 587 */ 588 struct rw_semaphore xattr_sem; 589 #endif 590 #ifdef CONFIG_EXT4_FS_POSIX_ACL 591 struct posix_acl *i_acl; 592 struct posix_acl *i_default_acl; 593 #endif 594 595 struct list_head i_orphan; /* unlinked but open inodes */ 596 597 /* 598 * i_disksize keeps track of what the inode size is ON DISK, not 599 * in memory. During truncate, i_size is set to the new size by 600 * the VFS prior to calling ext4_truncate(), but the filesystem won't 601 * set i_disksize to 0 until the truncate is actually under way. 602 * 603 * The intent is that i_disksize always represents the blocks which 604 * are used by this file. This allows recovery to restart truncate 605 * on orphans if we crash during truncate. We actually write i_disksize 606 * into the on-disk inode when writing inodes out, instead of i_size. 607 * 608 * The only time when i_disksize and i_size may be different is when 609 * a truncate is in progress. The only things which change i_disksize 610 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 611 */ 612 loff_t i_disksize; 613 614 /* 615 * i_data_sem is for serialising ext4_truncate() against 616 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 617 * data tree are chopped off during truncate. We can't do that in 618 * ext4 because whenever we perform intermediate commits during 619 * truncate, the inode and all the metadata blocks *must* be in a 620 * consistent state which allows truncation of the orphans to restart 621 * during recovery. Hence we must fix the get_block-vs-truncate race 622 * by other means, so we have i_data_sem. 623 */ 624 struct rw_semaphore i_data_sem; 625 struct inode vfs_inode; 626 struct jbd2_inode jinode; 627 628 struct ext4_ext_cache i_cached_extent; 629 /* 630 * File creation time. Its function is same as that of 631 * struct timespec i_{a,c,m}time in the generic inode. 632 */ 633 struct timespec i_crtime; 634 635 /* mballoc */ 636 struct list_head i_prealloc_list; 637 spinlock_t i_prealloc_lock; 638 639 /* ialloc */ 640 ext4_group_t i_last_alloc_group; 641 642 /* allocation reservation info for delalloc */ 643 unsigned int i_reserved_data_blocks; 644 unsigned int i_reserved_meta_blocks; 645 unsigned int i_allocated_meta_blocks; 646 unsigned short i_delalloc_reserved_flag; 647 648 /* on-disk additional length */ 649 __u16 i_extra_isize; 650 651 spinlock_t i_block_reservation_lock; 652 }; 653 654 /* 655 * File system states 656 */ 657 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 658 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 659 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 660 661 /* 662 * Misc. filesystem flags 663 */ 664 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 665 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 666 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 667 668 /* 669 * Mount flags 670 */ 671 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 672 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 673 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 674 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 675 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 676 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 677 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 678 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 679 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ 680 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 681 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 682 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 683 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 684 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 685 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 686 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 687 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 688 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 689 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 690 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 691 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 692 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 693 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 694 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 695 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 696 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 697 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 698 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 699 700 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ 701 #ifndef _LINUX_EXT2_FS_H 702 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 703 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 704 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 705 EXT4_MOUNT_##opt) 706 #else 707 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD 708 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT 709 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS 710 #endif 711 712 #define ext4_set_bit ext2_set_bit 713 #define ext4_set_bit_atomic ext2_set_bit_atomic 714 #define ext4_clear_bit ext2_clear_bit 715 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 716 #define ext4_test_bit ext2_test_bit 717 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 718 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 719 #define ext4_find_next_bit ext2_find_next_bit 720 721 /* 722 * Maximal mount counts between two filesystem checks 723 */ 724 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 725 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 726 727 /* 728 * Behaviour when detecting errors 729 */ 730 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 731 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 732 #define EXT4_ERRORS_PANIC 3 /* Panic */ 733 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 734 735 /* 736 * Structure of the super block 737 */ 738 struct ext4_super_block { 739 /*00*/ __le32 s_inodes_count; /* Inodes count */ 740 __le32 s_blocks_count_lo; /* Blocks count */ 741 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 742 __le32 s_free_blocks_count_lo; /* Free blocks count */ 743 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 744 __le32 s_first_data_block; /* First Data Block */ 745 __le32 s_log_block_size; /* Block size */ 746 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 747 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 748 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 749 __le32 s_inodes_per_group; /* # Inodes per group */ 750 __le32 s_mtime; /* Mount time */ 751 /*30*/ __le32 s_wtime; /* Write time */ 752 __le16 s_mnt_count; /* Mount count */ 753 __le16 s_max_mnt_count; /* Maximal mount count */ 754 __le16 s_magic; /* Magic signature */ 755 __le16 s_state; /* File system state */ 756 __le16 s_errors; /* Behaviour when detecting errors */ 757 __le16 s_minor_rev_level; /* minor revision level */ 758 /*40*/ __le32 s_lastcheck; /* time of last check */ 759 __le32 s_checkinterval; /* max. time between checks */ 760 __le32 s_creator_os; /* OS */ 761 __le32 s_rev_level; /* Revision level */ 762 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 763 __le16 s_def_resgid; /* Default gid for reserved blocks */ 764 /* 765 * These fields are for EXT4_DYNAMIC_REV superblocks only. 766 * 767 * Note: the difference between the compatible feature set and 768 * the incompatible feature set is that if there is a bit set 769 * in the incompatible feature set that the kernel doesn't 770 * know about, it should refuse to mount the filesystem. 771 * 772 * e2fsck's requirements are more strict; if it doesn't know 773 * about a feature in either the compatible or incompatible 774 * feature set, it must abort and not try to meddle with 775 * things it doesn't understand... 776 */ 777 __le32 s_first_ino; /* First non-reserved inode */ 778 __le16 s_inode_size; /* size of inode structure */ 779 __le16 s_block_group_nr; /* block group # of this superblock */ 780 __le32 s_feature_compat; /* compatible feature set */ 781 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 782 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 783 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 784 /*78*/ char s_volume_name[16]; /* volume name */ 785 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 786 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 787 /* 788 * Performance hints. Directory preallocation should only 789 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 790 */ 791 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 792 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 793 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 794 /* 795 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 796 */ 797 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 798 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 799 __le32 s_journal_dev; /* device number of journal file */ 800 __le32 s_last_orphan; /* start of list of inodes to delete */ 801 __le32 s_hash_seed[4]; /* HTREE hash seed */ 802 __u8 s_def_hash_version; /* Default hash version to use */ 803 __u8 s_reserved_char_pad; 804 __le16 s_desc_size; /* size of group descriptor */ 805 /*100*/ __le32 s_default_mount_opts; 806 __le32 s_first_meta_bg; /* First metablock block group */ 807 __le32 s_mkfs_time; /* When the filesystem was created */ 808 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 809 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 810 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 811 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 812 __le32 s_free_blocks_count_hi; /* Free blocks count */ 813 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 814 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 815 __le32 s_flags; /* Miscellaneous flags */ 816 __le16 s_raid_stride; /* RAID stride */ 817 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 818 __le64 s_mmp_block; /* Block for multi-mount protection */ 819 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 820 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 821 __u8 s_reserved_char_pad2; 822 __le16 s_reserved_pad; 823 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 824 __u32 s_reserved[160]; /* Padding to the end of the block */ 825 }; 826 827 #ifdef __KERNEL__ 828 /* 829 * fourth extended-fs super-block data in memory 830 */ 831 struct ext4_sb_info { 832 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 833 unsigned long s_inodes_per_block;/* Number of inodes per block */ 834 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 835 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 836 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 837 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 838 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 839 ext4_group_t s_groups_count; /* Number of groups in the fs */ 840 unsigned long s_overhead_last; /* Last calculated overhead */ 841 unsigned long s_blocks_last; /* Last seen block count */ 842 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 843 struct buffer_head * s_sbh; /* Buffer containing the super block */ 844 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 845 struct buffer_head **s_group_desc; 846 unsigned long s_mount_opt; 847 ext4_fsblk_t s_sb_block; 848 uid_t s_resuid; 849 gid_t s_resgid; 850 unsigned short s_mount_state; 851 unsigned short s_pad; 852 int s_addr_per_block_bits; 853 int s_desc_per_block_bits; 854 int s_inode_size; 855 int s_first_ino; 856 unsigned int s_inode_readahead_blks; 857 spinlock_t s_next_gen_lock; 858 u32 s_next_generation; 859 u32 s_hash_seed[4]; 860 int s_def_hash_version; 861 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 862 struct percpu_counter s_freeblocks_counter; 863 struct percpu_counter s_freeinodes_counter; 864 struct percpu_counter s_dirs_counter; 865 struct percpu_counter s_dirtyblocks_counter; 866 struct blockgroup_lock *s_blockgroup_lock; 867 struct proc_dir_entry *s_proc; 868 struct kobject s_kobj; 869 struct completion s_kobj_unregister; 870 871 /* Journaling */ 872 struct inode *s_journal_inode; 873 struct journal_s *s_journal; 874 struct list_head s_orphan; 875 struct mutex s_orphan_lock; 876 struct mutex s_resize_lock; 877 unsigned long s_commit_interval; 878 u32 s_max_batch_time; 879 u32 s_min_batch_time; 880 struct block_device *journal_bdev; 881 #ifdef CONFIG_JBD2_DEBUG 882 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 883 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 884 #endif 885 #ifdef CONFIG_QUOTA 886 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 887 int s_jquota_fmt; /* Format of quota to use */ 888 #endif 889 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 890 891 #ifdef EXTENTS_STATS 892 /* ext4 extents stats */ 893 unsigned long s_ext_min; 894 unsigned long s_ext_max; 895 unsigned long s_depth_max; 896 spinlock_t s_ext_stats_lock; 897 unsigned long s_ext_blocks; 898 unsigned long s_ext_extents; 899 #endif 900 901 /* for buddy allocator */ 902 struct ext4_group_info ***s_group_info; 903 struct inode *s_buddy_cache; 904 long s_blocks_reserved; 905 spinlock_t s_reserve_lock; 906 spinlock_t s_md_lock; 907 tid_t s_last_transaction; 908 unsigned short *s_mb_offsets; 909 unsigned int *s_mb_maxs; 910 911 /* tunables */ 912 unsigned long s_stripe; 913 unsigned int s_mb_stream_request; 914 unsigned int s_mb_max_to_scan; 915 unsigned int s_mb_min_to_scan; 916 unsigned int s_mb_stats; 917 unsigned int s_mb_order2_reqs; 918 unsigned int s_mb_group_prealloc; 919 /* where last allocation was done - for stream allocation */ 920 unsigned long s_mb_last_group; 921 unsigned long s_mb_last_start; 922 923 /* history to debug policy */ 924 struct ext4_mb_history *s_mb_history; 925 int s_mb_history_cur; 926 int s_mb_history_max; 927 int s_mb_history_num; 928 spinlock_t s_mb_history_lock; 929 int s_mb_history_filter; 930 931 /* stats for buddy allocator */ 932 spinlock_t s_mb_pa_lock; 933 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 934 atomic_t s_bal_success; /* we found long enough chunks */ 935 atomic_t s_bal_allocated; /* in blocks */ 936 atomic_t s_bal_ex_scanned; /* total extents scanned */ 937 atomic_t s_bal_goals; /* goal hits */ 938 atomic_t s_bal_breaks; /* too long searches */ 939 atomic_t s_bal_2orders; /* 2^order hits */ 940 spinlock_t s_bal_lock; 941 unsigned long s_mb_buddies_generated; 942 unsigned long long s_mb_generation_time; 943 atomic_t s_mb_lost_chunks; 944 atomic_t s_mb_preallocated; 945 atomic_t s_mb_discarded; 946 947 /* locality groups */ 948 struct ext4_locality_group *s_locality_groups; 949 950 /* for write statistics */ 951 unsigned long s_sectors_written_start; 952 u64 s_kbytes_written; 953 954 unsigned int s_log_groups_per_flex; 955 struct flex_groups *s_flex_groups; 956 }; 957 958 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 959 { 960 return sb->s_fs_info; 961 } 962 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 963 { 964 return container_of(inode, struct ext4_inode_info, vfs_inode); 965 } 966 967 static inline struct timespec ext4_current_time(struct inode *inode) 968 { 969 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 970 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 971 } 972 973 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 974 { 975 return ino == EXT4_ROOT_INO || 976 ino == EXT4_JOURNAL_INO || 977 ino == EXT4_RESIZE_INO || 978 (ino >= EXT4_FIRST_INO(sb) && 979 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 980 } 981 #else 982 /* Assume that user mode programs are passing in an ext4fs superblock, not 983 * a kernel struct super_block. This will allow us to call the feature-test 984 * macros from user land. */ 985 #define EXT4_SB(sb) (sb) 986 #endif 987 988 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 989 990 /* 991 * Codes for operating systems 992 */ 993 #define EXT4_OS_LINUX 0 994 #define EXT4_OS_HURD 1 995 #define EXT4_OS_MASIX 2 996 #define EXT4_OS_FREEBSD 3 997 #define EXT4_OS_LITES 4 998 999 /* 1000 * Revision levels 1001 */ 1002 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1003 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1004 1005 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1006 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1007 1008 #define EXT4_GOOD_OLD_INODE_SIZE 128 1009 1010 /* 1011 * Feature set definitions 1012 */ 1013 1014 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1015 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1016 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1017 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1018 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1019 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1020 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1021 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1022 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1023 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1024 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1025 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1026 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1027 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1028 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1029 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1030 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1031 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1032 1033 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1034 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1035 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1036 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1037 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1038 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1039 1040 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1041 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1042 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1043 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1044 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1045 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1046 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1047 1048 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1049 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1050 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1051 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1052 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1053 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1054 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1055 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1056 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1057 1058 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1059 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1060 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1061 EXT4_FEATURE_INCOMPAT_META_BG| \ 1062 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1063 EXT4_FEATURE_INCOMPAT_64BIT| \ 1064 EXT4_FEATURE_INCOMPAT_FLEX_BG) 1065 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1066 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1067 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1068 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1069 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1070 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1071 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1072 1073 /* 1074 * Default values for user and/or group using reserved blocks 1075 */ 1076 #define EXT4_DEF_RESUID 0 1077 #define EXT4_DEF_RESGID 0 1078 1079 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1080 1081 /* 1082 * Default mount options 1083 */ 1084 #define EXT4_DEFM_DEBUG 0x0001 1085 #define EXT4_DEFM_BSDGROUPS 0x0002 1086 #define EXT4_DEFM_XATTR_USER 0x0004 1087 #define EXT4_DEFM_ACL 0x0008 1088 #define EXT4_DEFM_UID16 0x0010 1089 #define EXT4_DEFM_JMODE 0x0060 1090 #define EXT4_DEFM_JMODE_DATA 0x0020 1091 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1092 #define EXT4_DEFM_JMODE_WBACK 0x0060 1093 1094 /* 1095 * Default journal batch times 1096 */ 1097 #define EXT4_DEF_MIN_BATCH_TIME 0 1098 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1099 1100 /* 1101 * Minimum number of groups in a flexgroup before we separate out 1102 * directories into the first block group of a flexgroup 1103 */ 1104 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1105 1106 /* 1107 * Structure of a directory entry 1108 */ 1109 #define EXT4_NAME_LEN 255 1110 1111 struct ext4_dir_entry { 1112 __le32 inode; /* Inode number */ 1113 __le16 rec_len; /* Directory entry length */ 1114 __le16 name_len; /* Name length */ 1115 char name[EXT4_NAME_LEN]; /* File name */ 1116 }; 1117 1118 /* 1119 * The new version of the directory entry. Since EXT4 structures are 1120 * stored in intel byte order, and the name_len field could never be 1121 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1122 * file_type field. 1123 */ 1124 struct ext4_dir_entry_2 { 1125 __le32 inode; /* Inode number */ 1126 __le16 rec_len; /* Directory entry length */ 1127 __u8 name_len; /* Name length */ 1128 __u8 file_type; 1129 char name[EXT4_NAME_LEN]; /* File name */ 1130 }; 1131 1132 /* 1133 * Ext4 directory file types. Only the low 3 bits are used. The 1134 * other bits are reserved for now. 1135 */ 1136 #define EXT4_FT_UNKNOWN 0 1137 #define EXT4_FT_REG_FILE 1 1138 #define EXT4_FT_DIR 2 1139 #define EXT4_FT_CHRDEV 3 1140 #define EXT4_FT_BLKDEV 4 1141 #define EXT4_FT_FIFO 5 1142 #define EXT4_FT_SOCK 6 1143 #define EXT4_FT_SYMLINK 7 1144 1145 #define EXT4_FT_MAX 8 1146 1147 /* 1148 * EXT4_DIR_PAD defines the directory entries boundaries 1149 * 1150 * NOTE: It must be a multiple of 4 1151 */ 1152 #define EXT4_DIR_PAD 4 1153 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1154 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1155 ~EXT4_DIR_ROUND) 1156 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1157 1158 /* 1159 * Hash Tree Directory indexing 1160 * (c) Daniel Phillips, 2001 1161 */ 1162 1163 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1164 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1165 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 1166 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1167 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1168 1169 /* Legal values for the dx_root hash_version field: */ 1170 1171 #define DX_HASH_LEGACY 0 1172 #define DX_HASH_HALF_MD4 1 1173 #define DX_HASH_TEA 2 1174 #define DX_HASH_LEGACY_UNSIGNED 3 1175 #define DX_HASH_HALF_MD4_UNSIGNED 4 1176 #define DX_HASH_TEA_UNSIGNED 5 1177 1178 #ifdef __KERNEL__ 1179 1180 /* hash info structure used by the directory hash */ 1181 struct dx_hash_info 1182 { 1183 u32 hash; 1184 u32 minor_hash; 1185 int hash_version; 1186 u32 *seed; 1187 }; 1188 1189 #define EXT4_HTREE_EOF 0x7fffffff 1190 1191 /* 1192 * Control parameters used by ext4_htree_next_block 1193 */ 1194 #define HASH_NB_ALWAYS 1 1195 1196 1197 /* 1198 * Describe an inode's exact location on disk and in memory 1199 */ 1200 struct ext4_iloc 1201 { 1202 struct buffer_head *bh; 1203 unsigned long offset; 1204 ext4_group_t block_group; 1205 }; 1206 1207 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1208 { 1209 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1210 } 1211 1212 /* 1213 * This structure is stuffed into the struct file's private_data field 1214 * for directories. It is where we put information so that we can do 1215 * readdir operations in hash tree order. 1216 */ 1217 struct dir_private_info { 1218 struct rb_root root; 1219 struct rb_node *curr_node; 1220 struct fname *extra_fname; 1221 loff_t last_pos; 1222 __u32 curr_hash; 1223 __u32 curr_minor_hash; 1224 __u32 next_hash; 1225 }; 1226 1227 /* calculate the first block number of the group */ 1228 static inline ext4_fsblk_t 1229 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1230 { 1231 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1232 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1233 } 1234 1235 /* 1236 * Special error return code only used by dx_probe() and its callers. 1237 */ 1238 #define ERR_BAD_DX_DIR -75000 1239 1240 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1241 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1242 1243 extern struct proc_dir_entry *ext4_proc_root; 1244 1245 /* 1246 * Function prototypes 1247 */ 1248 1249 /* 1250 * Ok, these declarations are also in <linux/kernel.h> but none of the 1251 * ext4 source programs needs to include it so they are duplicated here. 1252 */ 1253 # define NORET_TYPE /**/ 1254 # define ATTRIB_NORET __attribute__((noreturn)) 1255 # define NORET_AND noreturn, 1256 1257 /* bitmap.c */ 1258 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1259 1260 /* balloc.c */ 1261 extern unsigned int ext4_block_group(struct super_block *sb, 1262 ext4_fsblk_t blocknr); 1263 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1264 ext4_fsblk_t blocknr); 1265 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1266 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1267 ext4_group_t group); 1268 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1269 ext4_fsblk_t goal, unsigned long *count, int *errp); 1270 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1271 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1272 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1273 ext4_fsblk_t block, unsigned long count, int metadata); 1274 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1275 ext4_fsblk_t block, unsigned long count); 1276 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1277 extern void ext4_check_blocks_bitmap(struct super_block *); 1278 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1279 ext4_group_t block_group, 1280 struct buffer_head ** bh); 1281 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1282 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1283 ext4_group_t block_group); 1284 extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1285 struct buffer_head *bh, 1286 ext4_group_t group, 1287 struct ext4_group_desc *desc); 1288 #define ext4_free_blocks_after_init(sb, group, desc) \ 1289 ext4_init_block_bitmap(sb, NULL, group, desc) 1290 1291 /* dir.c */ 1292 extern int ext4_check_dir_entry(const char *, struct inode *, 1293 struct ext4_dir_entry_2 *, 1294 struct buffer_head *, unsigned int); 1295 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1296 __u32 minor_hash, 1297 struct ext4_dir_entry_2 *dirent); 1298 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1299 1300 /* fsync.c */ 1301 extern int ext4_sync_file(struct file *, struct dentry *, int); 1302 1303 /* hash.c */ 1304 extern int ext4fs_dirhash(const char *name, int len, struct 1305 dx_hash_info *hinfo); 1306 1307 /* ialloc.c */ 1308 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int); 1309 extern void ext4_free_inode(handle_t *, struct inode *); 1310 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1311 extern unsigned long ext4_count_free_inodes(struct super_block *); 1312 extern unsigned long ext4_count_dirs(struct super_block *); 1313 extern void ext4_check_inodes_bitmap(struct super_block *); 1314 extern unsigned ext4_init_inode_bitmap(struct super_block *sb, 1315 struct buffer_head *bh, 1316 ext4_group_t group, 1317 struct ext4_group_desc *desc); 1318 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1319 1320 /* mballoc.c */ 1321 extern long ext4_mb_stats; 1322 extern long ext4_mb_max_to_scan; 1323 extern int ext4_mb_init(struct super_block *, int); 1324 extern int ext4_mb_release(struct super_block *); 1325 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1326 struct ext4_allocation_request *, int *); 1327 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1328 extern void ext4_discard_preallocations(struct inode *); 1329 extern int __init init_ext4_mballoc(void); 1330 extern void exit_ext4_mballoc(void); 1331 extern void ext4_mb_free_blocks(handle_t *, struct inode *, 1332 unsigned long, unsigned long, int, unsigned long *); 1333 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1334 ext4_group_t i, struct ext4_group_desc *desc); 1335 extern void ext4_mb_update_group_info(struct ext4_group_info *grp, 1336 ext4_grpblk_t add); 1337 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1338 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1339 ext4_group_t, int); 1340 /* inode.c */ 1341 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 1342 struct buffer_head *bh, ext4_fsblk_t blocknr); 1343 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1344 ext4_lblk_t, int, int *); 1345 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1346 ext4_lblk_t, int, int *); 1347 int ext4_get_block(struct inode *inode, sector_t iblock, 1348 struct buffer_head *bh_result, int create); 1349 1350 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1351 extern int ext4_write_inode(struct inode *, int); 1352 extern int ext4_setattr(struct dentry *, struct iattr *); 1353 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1354 struct kstat *stat); 1355 extern void ext4_delete_inode(struct inode *); 1356 extern int ext4_sync_inode(handle_t *, struct inode *); 1357 extern void ext4_dirty_inode(struct inode *); 1358 extern int ext4_change_inode_journal_flag(struct inode *, int); 1359 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1360 extern int ext4_can_truncate(struct inode *inode); 1361 extern void ext4_truncate(struct inode *); 1362 extern void ext4_set_inode_flags(struct inode *); 1363 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1364 extern int ext4_alloc_da_blocks(struct inode *inode); 1365 extern void ext4_set_aops(struct inode *inode); 1366 extern int ext4_writepage_trans_blocks(struct inode *); 1367 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1368 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1369 extern int ext4_block_truncate_page(handle_t *handle, 1370 struct address_space *mapping, loff_t from); 1371 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1372 extern qsize_t ext4_get_reserved_space(struct inode *inode); 1373 1374 /* ioctl.c */ 1375 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1376 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1377 1378 /* migrate.c */ 1379 extern int ext4_ext_migrate(struct inode *); 1380 1381 /* namei.c */ 1382 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 1383 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 1384 extern int ext4_orphan_add(handle_t *, struct inode *); 1385 extern int ext4_orphan_del(handle_t *, struct inode *); 1386 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1387 __u32 start_minor_hash, __u32 *next_hash); 1388 1389 /* resize.c */ 1390 extern int ext4_group_add(struct super_block *sb, 1391 struct ext4_new_group_data *input); 1392 extern int ext4_group_extend(struct super_block *sb, 1393 struct ext4_super_block *es, 1394 ext4_fsblk_t n_blocks_count); 1395 1396 /* super.c */ 1397 extern void ext4_error(struct super_block *, const char *, const char *, ...) 1398 __attribute__ ((format (printf, 3, 4))); 1399 extern void __ext4_std_error(struct super_block *, const char *, int); 1400 extern void ext4_abort(struct super_block *, const char *, const char *, ...) 1401 __attribute__ ((format (printf, 3, 4))); 1402 extern void ext4_warning(struct super_block *, const char *, const char *, ...) 1403 __attribute__ ((format (printf, 3, 4))); 1404 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 1405 const char *, const char *, ...) 1406 __attribute__ ((format (printf, 4, 5))); 1407 extern void ext4_update_dynamic_rev(struct super_block *sb); 1408 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1409 __u32 compat); 1410 extern int ext4_update_rocompat_feature(handle_t *handle, 1411 struct super_block *sb, __u32 rocompat); 1412 extern int ext4_update_incompat_feature(handle_t *handle, 1413 struct super_block *sb, __u32 incompat); 1414 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1415 struct ext4_group_desc *bg); 1416 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1417 struct ext4_group_desc *bg); 1418 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1419 struct ext4_group_desc *bg); 1420 extern __u32 ext4_free_blks_count(struct super_block *sb, 1421 struct ext4_group_desc *bg); 1422 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1423 struct ext4_group_desc *bg); 1424 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1425 struct ext4_group_desc *bg); 1426 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1427 struct ext4_group_desc *bg); 1428 extern void ext4_block_bitmap_set(struct super_block *sb, 1429 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1430 extern void ext4_inode_bitmap_set(struct super_block *sb, 1431 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1432 extern void ext4_inode_table_set(struct super_block *sb, 1433 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1434 extern void ext4_free_blks_set(struct super_block *sb, 1435 struct ext4_group_desc *bg, __u32 count); 1436 extern void ext4_free_inodes_set(struct super_block *sb, 1437 struct ext4_group_desc *bg, __u32 count); 1438 extern void ext4_used_dirs_set(struct super_block *sb, 1439 struct ext4_group_desc *bg, __u32 count); 1440 extern void ext4_itable_unused_set(struct super_block *sb, 1441 struct ext4_group_desc *bg, __u32 count); 1442 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1443 struct ext4_group_desc *gdp); 1444 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1445 struct ext4_group_desc *gdp); 1446 1447 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1448 { 1449 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1450 le32_to_cpu(es->s_blocks_count_lo); 1451 } 1452 1453 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1454 { 1455 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1456 le32_to_cpu(es->s_r_blocks_count_lo); 1457 } 1458 1459 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1460 { 1461 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1462 le32_to_cpu(es->s_free_blocks_count_lo); 1463 } 1464 1465 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1466 ext4_fsblk_t blk) 1467 { 1468 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1469 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1470 } 1471 1472 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1473 ext4_fsblk_t blk) 1474 { 1475 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1476 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1477 } 1478 1479 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1480 ext4_fsblk_t blk) 1481 { 1482 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1483 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1484 } 1485 1486 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1487 { 1488 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1489 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1490 le32_to_cpu(raw_inode->i_size_lo); 1491 else 1492 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1493 } 1494 1495 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1496 { 1497 raw_inode->i_size_lo = cpu_to_le32(i_size); 1498 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1499 } 1500 1501 static inline 1502 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1503 ext4_group_t group) 1504 { 1505 struct ext4_group_info ***grp_info; 1506 long indexv, indexh; 1507 grp_info = EXT4_SB(sb)->s_group_info; 1508 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1509 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1510 return grp_info[indexv][indexh]; 1511 } 1512 1513 /* 1514 * Reading s_groups_count requires using smp_rmb() afterwards. See 1515 * the locking protocol documented in the comments of ext4_group_add() 1516 * in resize.c 1517 */ 1518 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1519 { 1520 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1521 1522 smp_rmb(); 1523 return ngroups; 1524 } 1525 1526 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1527 ext4_group_t block_group) 1528 { 1529 return block_group >> sbi->s_log_groups_per_flex; 1530 } 1531 1532 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1533 { 1534 return 1 << sbi->s_log_groups_per_flex; 1535 } 1536 1537 #define ext4_std_error(sb, errno) \ 1538 do { \ 1539 if ((errno)) \ 1540 __ext4_std_error((sb), __func__, (errno)); \ 1541 } while (0) 1542 1543 #ifdef CONFIG_SMP 1544 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1545 * counters. So we need to make sure we have free blocks more 1546 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1547 */ 1548 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1549 #else 1550 #define EXT4_FREEBLOCKS_WATERMARK 0 1551 #endif 1552 1553 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1554 { 1555 /* 1556 * XXX: replace with spinlock if seen contended -bzzz 1557 */ 1558 down_write(&EXT4_I(inode)->i_data_sem); 1559 if (newsize > EXT4_I(inode)->i_disksize) 1560 EXT4_I(inode)->i_disksize = newsize; 1561 up_write(&EXT4_I(inode)->i_data_sem); 1562 return ; 1563 } 1564 1565 struct ext4_group_info { 1566 unsigned long bb_state; 1567 struct rb_root bb_free_root; 1568 unsigned short bb_first_free; 1569 unsigned short bb_free; 1570 unsigned short bb_fragments; 1571 struct list_head bb_prealloc_list; 1572 #ifdef DOUBLE_CHECK 1573 void *bb_bitmap; 1574 #endif 1575 struct rw_semaphore alloc_sem; 1576 unsigned short bb_counters[]; 1577 }; 1578 1579 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1580 1581 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1582 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1583 1584 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 1585 ext4_group_t group) 1586 { 1587 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 1588 } 1589 1590 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1591 { 1592 spin_lock(ext4_group_lock_ptr(sb, group)); 1593 } 1594 1595 static inline void ext4_unlock_group(struct super_block *sb, 1596 ext4_group_t group) 1597 { 1598 spin_unlock(ext4_group_lock_ptr(sb, group)); 1599 } 1600 1601 /* 1602 * Inodes and files operations 1603 */ 1604 1605 /* dir.c */ 1606 extern const struct file_operations ext4_dir_operations; 1607 1608 /* file.c */ 1609 extern const struct inode_operations ext4_file_inode_operations; 1610 extern const struct file_operations ext4_file_operations; 1611 1612 /* namei.c */ 1613 extern const struct inode_operations ext4_dir_inode_operations; 1614 extern const struct inode_operations ext4_special_inode_operations; 1615 extern struct dentry *ext4_get_parent(struct dentry *child); 1616 1617 /* symlink.c */ 1618 extern const struct inode_operations ext4_symlink_inode_operations; 1619 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1620 1621 /* extents.c */ 1622 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1623 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1624 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1625 int chunk); 1626 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1627 ext4_lblk_t iblock, unsigned int max_blocks, 1628 struct buffer_head *bh_result, int flags); 1629 extern void ext4_ext_truncate(struct inode *); 1630 extern void ext4_ext_init(struct super_block *); 1631 extern void ext4_ext_release(struct super_block *); 1632 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1633 loff_t len); 1634 extern int ext4_get_blocks(handle_t *handle, struct inode *inode, 1635 sector_t block, unsigned int max_blocks, 1636 struct buffer_head *bh, int flags); 1637 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1638 __u64 start, __u64 len); 1639 1640 /* 1641 * Add new method to test wether block and inode bitmaps are properly 1642 * initialized. With uninit_bg reading the block from disk is not enough 1643 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1644 */ 1645 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1646 1647 static inline int bitmap_uptodate(struct buffer_head *bh) 1648 { 1649 return (buffer_uptodate(bh) && 1650 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1651 } 1652 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1653 { 1654 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1655 } 1656 1657 #endif /* __KERNEL__ */ 1658 1659 #endif /* _EXT4_H */ 1660