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 0x0001 71 /* blocks already reserved */ 72 #define EXT4_MB_HINT_RESERVED 0x0002 73 /* metadata is being allocated */ 74 #define EXT4_MB_HINT_METADATA 0x0004 75 /* first blocks in the file */ 76 #define EXT4_MB_HINT_FIRST 0x0008 77 /* search for the best chunk */ 78 #define EXT4_MB_HINT_BEST 0x0010 79 /* data is being allocated */ 80 #define EXT4_MB_HINT_DATA 0x0020 81 /* don't preallocate (for tails) */ 82 #define EXT4_MB_HINT_NOPREALLOC 0x0040 83 /* allocate for locality group */ 84 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 85 /* allocate goal blocks or none */ 86 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 87 /* goal is meaningful */ 88 #define EXT4_MB_HINT_TRY_GOAL 0x0200 89 /* blocks already pre-reserved by delayed allocation */ 90 #define EXT4_MB_DELALLOC_RESERVED 0x0400 91 /* We are doing stream allocation */ 92 #define EXT4_MB_STREAM_ALLOC 0x0800 93 94 95 struct ext4_allocation_request { 96 /* target inode for block we're allocating */ 97 struct inode *inode; 98 /* how many blocks we want to allocate */ 99 unsigned int len; 100 /* logical block in target inode */ 101 ext4_lblk_t logical; 102 /* the closest logical allocated block to the left */ 103 ext4_lblk_t lleft; 104 /* the closest logical allocated block to the right */ 105 ext4_lblk_t lright; 106 /* phys. target (a hint) */ 107 ext4_fsblk_t goal; 108 /* phys. block for the closest logical allocated block to the left */ 109 ext4_fsblk_t pleft; 110 /* phys. block for the closest logical allocated block to the right */ 111 ext4_fsblk_t pright; 112 /* flags. see above EXT4_MB_HINT_* */ 113 unsigned int flags; 114 }; 115 116 /* 117 * For delayed allocation tracking 118 */ 119 struct mpage_da_data { 120 struct inode *inode; 121 sector_t b_blocknr; /* start block number of extent */ 122 size_t b_size; /* size of extent */ 123 unsigned long b_state; /* state of the extent */ 124 unsigned long first_page, next_page; /* extent of pages */ 125 struct writeback_control *wbc; 126 int io_done; 127 int pages_written; 128 int retval; 129 }; 130 131 /* 132 * Special inodes numbers 133 */ 134 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 135 #define EXT4_ROOT_INO 2 /* Root inode */ 136 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 137 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 138 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 139 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 140 141 /* First non-reserved inode for old ext4 filesystems */ 142 #define EXT4_GOOD_OLD_FIRST_INO 11 143 144 /* 145 * Maximal count of links to a file 146 */ 147 #define EXT4_LINK_MAX 65000 148 149 /* 150 * Macro-instructions used to manage several block sizes 151 */ 152 #define EXT4_MIN_BLOCK_SIZE 1024 153 #define EXT4_MAX_BLOCK_SIZE 65536 154 #define EXT4_MIN_BLOCK_LOG_SIZE 10 155 #ifdef __KERNEL__ 156 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 157 #else 158 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 159 #endif 160 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 161 #ifdef __KERNEL__ 162 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 163 #else 164 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 165 #endif 166 #ifdef __KERNEL__ 167 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 168 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 169 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 170 #else 171 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 172 EXT4_GOOD_OLD_INODE_SIZE : \ 173 (s)->s_inode_size) 174 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 175 EXT4_GOOD_OLD_FIRST_INO : \ 176 (s)->s_first_ino) 177 #endif 178 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 179 180 /* 181 * Structure of a blocks group descriptor 182 */ 183 struct ext4_group_desc 184 { 185 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 186 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 187 __le32 bg_inode_table_lo; /* Inodes table block */ 188 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 189 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 190 __le16 bg_used_dirs_count_lo; /* Directories count */ 191 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 192 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 193 __le16 bg_itable_unused_lo; /* Unused inodes count */ 194 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 195 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 196 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 197 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 198 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 199 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 200 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 201 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 202 __u32 bg_reserved2[3]; 203 }; 204 205 /* 206 * Structure of a flex block group info 207 */ 208 209 struct flex_groups { 210 atomic_t free_inodes; 211 atomic_t free_blocks; 212 atomic_t used_dirs; 213 }; 214 215 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 216 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 217 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 218 219 /* 220 * Macro-instructions used to manage group descriptors 221 */ 222 #define EXT4_MIN_DESC_SIZE 32 223 #define EXT4_MIN_DESC_SIZE_64BIT 64 224 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 225 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 226 #ifdef __KERNEL__ 227 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 228 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 229 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 230 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 231 #else 232 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 233 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 234 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 235 #endif 236 237 /* 238 * Constants relative to the data blocks 239 */ 240 #define EXT4_NDIR_BLOCKS 12 241 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 242 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 243 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 244 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 245 246 /* 247 * Inode flags 248 */ 249 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 250 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 251 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 252 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 253 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 254 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 255 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 256 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 257 /* Reserved for compression usage... */ 258 #define EXT4_DIRTY_FL 0x00000100 259 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 260 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 261 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 262 /* End compression flags --- maybe not all used */ 263 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 264 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 265 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 266 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 267 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 268 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 269 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 270 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 271 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 272 273 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 274 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ 275 276 /* Flags that should be inherited by new inodes from their parent. */ 277 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 278 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 279 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 280 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 281 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 282 283 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 284 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 285 286 /* Flags that are appropriate for non-directories/regular files. */ 287 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 288 289 /* Mask out flags that are inappropriate for the given type of inode. */ 290 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 291 { 292 if (S_ISDIR(mode)) 293 return flags; 294 else if (S_ISREG(mode)) 295 return flags & EXT4_REG_FLMASK; 296 else 297 return flags & EXT4_OTHER_FLMASK; 298 } 299 300 /* 301 * Inode dynamic state flags 302 */ 303 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 304 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 305 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 306 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 307 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ 308 #define EXT4_STATE_EXT_MIGRATE 0x00000020 /* Inode is migrating */ 309 310 /* Used to pass group descriptor data when online resize is done */ 311 struct ext4_new_group_input { 312 __u32 group; /* Group number for this data */ 313 __u64 block_bitmap; /* Absolute block number of block bitmap */ 314 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 315 __u64 inode_table; /* Absolute block number of inode table start */ 316 __u32 blocks_count; /* Total number of blocks in this group */ 317 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 318 __u16 unused; 319 }; 320 321 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 322 struct ext4_new_group_data { 323 __u32 group; 324 __u64 block_bitmap; 325 __u64 inode_bitmap; 326 __u64 inode_table; 327 __u32 blocks_count; 328 __u16 reserved_blocks; 329 __u16 unused; 330 __u32 free_blocks_count; 331 }; 332 333 /* 334 * Flags used by ext4_get_blocks() 335 */ 336 /* Allocate any needed blocks and/or convert an unitialized 337 extent to be an initialized ext4 */ 338 #define EXT4_GET_BLOCKS_CREATE 0x0001 339 /* Request the creation of an unitialized extent */ 340 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 341 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 342 EXT4_GET_BLOCKS_CREATE) 343 /* Caller is from the delayed allocation writeout path, 344 so set the magic i_delalloc_reserve_flag after taking the 345 inode allocation semaphore for */ 346 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 347 /* Call ext4_da_update_reserve_space() after successfully 348 allocating the blocks */ 349 #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008 350 351 352 /* 353 * ioctl commands 354 */ 355 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 356 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 357 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 358 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 359 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 360 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 361 #ifdef CONFIG_JBD2_DEBUG 362 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 363 #endif 364 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 365 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 366 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 367 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 368 #define EXT4_IOC_MIGRATE _IO('f', 9) 369 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 370 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 371 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 372 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 373 374 /* 375 * ioctl commands in 32 bit emulation 376 */ 377 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 378 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 379 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 380 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 381 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 382 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 383 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 384 #ifdef CONFIG_JBD2_DEBUG 385 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 386 #endif 387 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 388 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 389 390 391 /* 392 * Mount options 393 */ 394 struct ext4_mount_options { 395 unsigned long s_mount_opt; 396 uid_t s_resuid; 397 gid_t s_resgid; 398 unsigned long s_commit_interval; 399 u32 s_min_batch_time, s_max_batch_time; 400 #ifdef CONFIG_QUOTA 401 int s_jquota_fmt; 402 char *s_qf_names[MAXQUOTAS]; 403 #endif 404 }; 405 406 /* Max physical block we can addres w/o extents */ 407 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 408 409 /* 410 * Structure of an inode on the disk 411 */ 412 struct ext4_inode { 413 __le16 i_mode; /* File mode */ 414 __le16 i_uid; /* Low 16 bits of Owner Uid */ 415 __le32 i_size_lo; /* Size in bytes */ 416 __le32 i_atime; /* Access time */ 417 __le32 i_ctime; /* Inode Change time */ 418 __le32 i_mtime; /* Modification time */ 419 __le32 i_dtime; /* Deletion Time */ 420 __le16 i_gid; /* Low 16 bits of Group Id */ 421 __le16 i_links_count; /* Links count */ 422 __le32 i_blocks_lo; /* Blocks count */ 423 __le32 i_flags; /* File flags */ 424 union { 425 struct { 426 __le32 l_i_version; 427 } linux1; 428 struct { 429 __u32 h_i_translator; 430 } hurd1; 431 struct { 432 __u32 m_i_reserved1; 433 } masix1; 434 } osd1; /* OS dependent 1 */ 435 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 436 __le32 i_generation; /* File version (for NFS) */ 437 __le32 i_file_acl_lo; /* File ACL */ 438 __le32 i_size_high; 439 __le32 i_obso_faddr; /* Obsoleted fragment address */ 440 union { 441 struct { 442 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 443 __le16 l_i_file_acl_high; 444 __le16 l_i_uid_high; /* these 2 fields */ 445 __le16 l_i_gid_high; /* were reserved2[0] */ 446 __u32 l_i_reserved2; 447 } linux2; 448 struct { 449 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 450 __u16 h_i_mode_high; 451 __u16 h_i_uid_high; 452 __u16 h_i_gid_high; 453 __u32 h_i_author; 454 } hurd2; 455 struct { 456 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 457 __le16 m_i_file_acl_high; 458 __u32 m_i_reserved2[2]; 459 } masix2; 460 } osd2; /* OS dependent 2 */ 461 __le16 i_extra_isize; 462 __le16 i_pad1; 463 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 464 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 465 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 466 __le32 i_crtime; /* File Creation time */ 467 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 468 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 469 }; 470 471 struct move_extent { 472 __u32 reserved; /* should be zero */ 473 __u32 donor_fd; /* donor file descriptor */ 474 __u64 orig_start; /* logical start offset in block for orig */ 475 __u64 donor_start; /* logical start offset in block for donor */ 476 __u64 len; /* block length to be moved */ 477 __u64 moved_len; /* moved block length */ 478 }; 479 480 #define EXT4_EPOCH_BITS 2 481 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 482 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 483 484 /* 485 * Extended fields will fit into an inode if the filesystem was formatted 486 * with large inodes (-I 256 or larger) and there are not currently any EAs 487 * consuming all of the available space. For new inodes we always reserve 488 * enough space for the kernel's known extended fields, but for inodes 489 * created with an old kernel this might not have been the case. None of 490 * the extended inode fields is critical for correct filesystem operation. 491 * This macro checks if a certain field fits in the inode. Note that 492 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 493 */ 494 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 495 ((offsetof(typeof(*ext4_inode), field) + \ 496 sizeof((ext4_inode)->field)) \ 497 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 498 (einode)->i_extra_isize)) \ 499 500 static inline __le32 ext4_encode_extra_time(struct timespec *time) 501 { 502 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 503 time->tv_sec >> 32 : 0) | 504 ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 505 } 506 507 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 508 { 509 if (sizeof(time->tv_sec) > 4) 510 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 511 << 32; 512 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 513 } 514 515 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 516 do { \ 517 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 518 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 519 (raw_inode)->xtime ## _extra = \ 520 ext4_encode_extra_time(&(inode)->xtime); \ 521 } while (0) 522 523 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 524 do { \ 525 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 526 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 527 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 528 (raw_inode)->xtime ## _extra = \ 529 ext4_encode_extra_time(&(einode)->xtime); \ 530 } while (0) 531 532 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 533 do { \ 534 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 535 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 536 ext4_decode_extra_time(&(inode)->xtime, \ 537 raw_inode->xtime ## _extra); \ 538 } while (0) 539 540 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 541 do { \ 542 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 543 (einode)->xtime.tv_sec = \ 544 (signed)le32_to_cpu((raw_inode)->xtime); \ 545 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 546 ext4_decode_extra_time(&(einode)->xtime, \ 547 raw_inode->xtime ## _extra); \ 548 } while (0) 549 550 #define i_disk_version osd1.linux1.l_i_version 551 552 #if defined(__KERNEL__) || defined(__linux__) 553 #define i_reserved1 osd1.linux1.l_i_reserved1 554 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 555 #define i_blocks_high osd2.linux2.l_i_blocks_high 556 #define i_uid_low i_uid 557 #define i_gid_low i_gid 558 #define i_uid_high osd2.linux2.l_i_uid_high 559 #define i_gid_high osd2.linux2.l_i_gid_high 560 #define i_reserved2 osd2.linux2.l_i_reserved2 561 562 #elif defined(__GNU__) 563 564 #define i_translator osd1.hurd1.h_i_translator 565 #define i_uid_high osd2.hurd2.h_i_uid_high 566 #define i_gid_high osd2.hurd2.h_i_gid_high 567 #define i_author osd2.hurd2.h_i_author 568 569 #elif defined(__masix__) 570 571 #define i_reserved1 osd1.masix1.m_i_reserved1 572 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 573 #define i_reserved2 osd2.masix2.m_i_reserved2 574 575 #endif /* defined(__KERNEL__) || defined(__linux__) */ 576 577 /* 578 * storage for cached extent 579 */ 580 struct ext4_ext_cache { 581 ext4_fsblk_t ec_start; 582 ext4_lblk_t ec_block; 583 __u32 ec_len; /* must be 32bit to return holes */ 584 __u32 ec_type; 585 }; 586 587 /* 588 * fourth extended file system inode data in memory 589 */ 590 struct ext4_inode_info { 591 __le32 i_data[15]; /* unconverted */ 592 __u32 i_flags; 593 ext4_fsblk_t i_file_acl; 594 __u32 i_dtime; 595 596 /* 597 * i_block_group is the number of the block group which contains 598 * this file's inode. Constant across the lifetime of the inode, 599 * it is ued for making block allocation decisions - we try to 600 * place a file's data blocks near its inode block, and new inodes 601 * near to their parent directory's inode. 602 */ 603 ext4_group_t i_block_group; 604 __u32 i_state; /* Dynamic state flags for ext4 */ 605 606 ext4_lblk_t i_dir_start_lookup; 607 #ifdef CONFIG_EXT4_FS_XATTR 608 /* 609 * Extended attributes can be read independently of the main file 610 * data. Taking i_mutex even when reading would cause contention 611 * between readers of EAs and writers of regular file data, so 612 * instead we synchronize on xattr_sem when reading or changing 613 * EAs. 614 */ 615 struct rw_semaphore xattr_sem; 616 #endif 617 618 struct list_head i_orphan; /* unlinked but open inodes */ 619 620 /* 621 * i_disksize keeps track of what the inode size is ON DISK, not 622 * in memory. During truncate, i_size is set to the new size by 623 * the VFS prior to calling ext4_truncate(), but the filesystem won't 624 * set i_disksize to 0 until the truncate is actually under way. 625 * 626 * The intent is that i_disksize always represents the blocks which 627 * are used by this file. This allows recovery to restart truncate 628 * on orphans if we crash during truncate. We actually write i_disksize 629 * into the on-disk inode when writing inodes out, instead of i_size. 630 * 631 * The only time when i_disksize and i_size may be different is when 632 * a truncate is in progress. The only things which change i_disksize 633 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 634 */ 635 loff_t i_disksize; 636 637 /* 638 * i_data_sem is for serialising ext4_truncate() against 639 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 640 * data tree are chopped off during truncate. We can't do that in 641 * ext4 because whenever we perform intermediate commits during 642 * truncate, the inode and all the metadata blocks *must* be in a 643 * consistent state which allows truncation of the orphans to restart 644 * during recovery. Hence we must fix the get_block-vs-truncate race 645 * by other means, so we have i_data_sem. 646 */ 647 struct rw_semaphore i_data_sem; 648 struct inode vfs_inode; 649 struct jbd2_inode jinode; 650 651 struct ext4_ext_cache i_cached_extent; 652 /* 653 * File creation time. Its function is same as that of 654 * struct timespec i_{a,c,m}time in the generic inode. 655 */ 656 struct timespec i_crtime; 657 658 /* mballoc */ 659 struct list_head i_prealloc_list; 660 spinlock_t i_prealloc_lock; 661 662 /* ialloc */ 663 ext4_group_t i_last_alloc_group; 664 665 /* allocation reservation info for delalloc */ 666 unsigned int i_reserved_data_blocks; 667 unsigned int i_reserved_meta_blocks; 668 unsigned int i_allocated_meta_blocks; 669 unsigned short i_delalloc_reserved_flag; 670 671 /* on-disk additional length */ 672 __u16 i_extra_isize; 673 674 spinlock_t i_block_reservation_lock; 675 }; 676 677 /* 678 * File system states 679 */ 680 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 681 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 682 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 683 684 /* 685 * Misc. filesystem flags 686 */ 687 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 688 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 689 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 690 691 /* 692 * Mount flags 693 */ 694 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 695 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 696 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 697 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 698 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 699 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 700 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 701 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 702 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 703 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 704 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 705 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 706 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 707 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 708 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 709 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 710 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 711 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 712 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 713 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 714 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 715 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 716 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 717 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 718 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 719 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 720 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 721 722 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 723 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 724 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 725 EXT4_MOUNT_##opt) 726 727 #define ext4_set_bit ext2_set_bit 728 #define ext4_set_bit_atomic ext2_set_bit_atomic 729 #define ext4_clear_bit ext2_clear_bit 730 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 731 #define ext4_test_bit ext2_test_bit 732 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 733 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 734 #define ext4_find_next_bit ext2_find_next_bit 735 736 /* 737 * Maximal mount counts between two filesystem checks 738 */ 739 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 740 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 741 742 /* 743 * Behaviour when detecting errors 744 */ 745 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 746 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 747 #define EXT4_ERRORS_PANIC 3 /* Panic */ 748 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 749 750 /* 751 * Structure of the super block 752 */ 753 struct ext4_super_block { 754 /*00*/ __le32 s_inodes_count; /* Inodes count */ 755 __le32 s_blocks_count_lo; /* Blocks count */ 756 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 757 __le32 s_free_blocks_count_lo; /* Free blocks count */ 758 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 759 __le32 s_first_data_block; /* First Data Block */ 760 __le32 s_log_block_size; /* Block size */ 761 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 762 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 763 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 764 __le32 s_inodes_per_group; /* # Inodes per group */ 765 __le32 s_mtime; /* Mount time */ 766 /*30*/ __le32 s_wtime; /* Write time */ 767 __le16 s_mnt_count; /* Mount count */ 768 __le16 s_max_mnt_count; /* Maximal mount count */ 769 __le16 s_magic; /* Magic signature */ 770 __le16 s_state; /* File system state */ 771 __le16 s_errors; /* Behaviour when detecting errors */ 772 __le16 s_minor_rev_level; /* minor revision level */ 773 /*40*/ __le32 s_lastcheck; /* time of last check */ 774 __le32 s_checkinterval; /* max. time between checks */ 775 __le32 s_creator_os; /* OS */ 776 __le32 s_rev_level; /* Revision level */ 777 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 778 __le16 s_def_resgid; /* Default gid for reserved blocks */ 779 /* 780 * These fields are for EXT4_DYNAMIC_REV superblocks only. 781 * 782 * Note: the difference between the compatible feature set and 783 * the incompatible feature set is that if there is a bit set 784 * in the incompatible feature set that the kernel doesn't 785 * know about, it should refuse to mount the filesystem. 786 * 787 * e2fsck's requirements are more strict; if it doesn't know 788 * about a feature in either the compatible or incompatible 789 * feature set, it must abort and not try to meddle with 790 * things it doesn't understand... 791 */ 792 __le32 s_first_ino; /* First non-reserved inode */ 793 __le16 s_inode_size; /* size of inode structure */ 794 __le16 s_block_group_nr; /* block group # of this superblock */ 795 __le32 s_feature_compat; /* compatible feature set */ 796 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 797 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 798 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 799 /*78*/ char s_volume_name[16]; /* volume name */ 800 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 801 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 802 /* 803 * Performance hints. Directory preallocation should only 804 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 805 */ 806 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 807 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 808 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 809 /* 810 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 811 */ 812 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 813 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 814 __le32 s_journal_dev; /* device number of journal file */ 815 __le32 s_last_orphan; /* start of list of inodes to delete */ 816 __le32 s_hash_seed[4]; /* HTREE hash seed */ 817 __u8 s_def_hash_version; /* Default hash version to use */ 818 __u8 s_reserved_char_pad; 819 __le16 s_desc_size; /* size of group descriptor */ 820 /*100*/ __le32 s_default_mount_opts; 821 __le32 s_first_meta_bg; /* First metablock block group */ 822 __le32 s_mkfs_time; /* When the filesystem was created */ 823 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 824 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 825 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 826 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 827 __le32 s_free_blocks_count_hi; /* Free blocks count */ 828 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 829 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 830 __le32 s_flags; /* Miscellaneous flags */ 831 __le16 s_raid_stride; /* RAID stride */ 832 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 833 __le64 s_mmp_block; /* Block for multi-mount protection */ 834 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 835 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 836 __u8 s_reserved_char_pad2; 837 __le16 s_reserved_pad; 838 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 839 __u32 s_reserved[160]; /* Padding to the end of the block */ 840 }; 841 842 #ifdef __KERNEL__ 843 844 /* 845 * run-time mount flags 846 */ 847 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 848 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 849 850 /* 851 * fourth extended-fs super-block data in memory 852 */ 853 struct ext4_sb_info { 854 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 855 unsigned long s_inodes_per_block;/* Number of inodes per block */ 856 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 857 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 858 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 859 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 860 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 861 ext4_group_t s_groups_count; /* Number of groups in the fs */ 862 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 863 unsigned long s_overhead_last; /* Last calculated overhead */ 864 unsigned long s_blocks_last; /* Last seen block count */ 865 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 866 struct buffer_head * s_sbh; /* Buffer containing the super block */ 867 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 868 struct buffer_head **s_group_desc; 869 unsigned int s_mount_opt; 870 unsigned int s_mount_flags; 871 ext4_fsblk_t s_sb_block; 872 uid_t s_resuid; 873 gid_t s_resgid; 874 unsigned short s_mount_state; 875 unsigned short s_pad; 876 int s_addr_per_block_bits; 877 int s_desc_per_block_bits; 878 int s_inode_size; 879 int s_first_ino; 880 unsigned int s_inode_readahead_blks; 881 unsigned int s_inode_goal; 882 spinlock_t s_next_gen_lock; 883 u32 s_next_generation; 884 u32 s_hash_seed[4]; 885 int s_def_hash_version; 886 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 887 struct percpu_counter s_freeblocks_counter; 888 struct percpu_counter s_freeinodes_counter; 889 struct percpu_counter s_dirs_counter; 890 struct percpu_counter s_dirtyblocks_counter; 891 struct blockgroup_lock *s_blockgroup_lock; 892 struct proc_dir_entry *s_proc; 893 struct kobject s_kobj; 894 struct completion s_kobj_unregister; 895 896 /* Journaling */ 897 struct inode *s_journal_inode; 898 struct journal_s *s_journal; 899 struct list_head s_orphan; 900 struct mutex s_orphan_lock; 901 struct mutex s_resize_lock; 902 unsigned long s_commit_interval; 903 u32 s_max_batch_time; 904 u32 s_min_batch_time; 905 struct block_device *journal_bdev; 906 #ifdef CONFIG_JBD2_DEBUG 907 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 908 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 909 #endif 910 #ifdef CONFIG_QUOTA 911 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 912 int s_jquota_fmt; /* Format of quota to use */ 913 #endif 914 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 915 struct rb_root system_blks; 916 917 #ifdef EXTENTS_STATS 918 /* ext4 extents stats */ 919 unsigned long s_ext_min; 920 unsigned long s_ext_max; 921 unsigned long s_depth_max; 922 spinlock_t s_ext_stats_lock; 923 unsigned long s_ext_blocks; 924 unsigned long s_ext_extents; 925 #endif 926 927 /* for buddy allocator */ 928 struct ext4_group_info ***s_group_info; 929 struct inode *s_buddy_cache; 930 long s_blocks_reserved; 931 spinlock_t s_reserve_lock; 932 spinlock_t s_md_lock; 933 tid_t s_last_transaction; 934 unsigned short *s_mb_offsets; 935 unsigned int *s_mb_maxs; 936 937 /* tunables */ 938 unsigned long s_stripe; 939 unsigned int s_mb_stream_request; 940 unsigned int s_mb_max_to_scan; 941 unsigned int s_mb_min_to_scan; 942 unsigned int s_mb_stats; 943 unsigned int s_mb_order2_reqs; 944 unsigned int s_mb_group_prealloc; 945 /* where last allocation was done - for stream allocation */ 946 unsigned long s_mb_last_group; 947 unsigned long s_mb_last_start; 948 949 /* history to debug policy */ 950 struct ext4_mb_history *s_mb_history; 951 int s_mb_history_cur; 952 int s_mb_history_max; 953 int s_mb_history_num; 954 spinlock_t s_mb_history_lock; 955 int s_mb_history_filter; 956 957 /* stats for buddy allocator */ 958 spinlock_t s_mb_pa_lock; 959 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 960 atomic_t s_bal_success; /* we found long enough chunks */ 961 atomic_t s_bal_allocated; /* in blocks */ 962 atomic_t s_bal_ex_scanned; /* total extents scanned */ 963 atomic_t s_bal_goals; /* goal hits */ 964 atomic_t s_bal_breaks; /* too long searches */ 965 atomic_t s_bal_2orders; /* 2^order hits */ 966 spinlock_t s_bal_lock; 967 unsigned long s_mb_buddies_generated; 968 unsigned long long s_mb_generation_time; 969 atomic_t s_mb_lost_chunks; 970 atomic_t s_mb_preallocated; 971 atomic_t s_mb_discarded; 972 atomic_t s_lock_busy; 973 974 /* locality groups */ 975 struct ext4_locality_group *s_locality_groups; 976 977 /* for write statistics */ 978 unsigned long s_sectors_written_start; 979 u64 s_kbytes_written; 980 981 unsigned int s_log_groups_per_flex; 982 struct flex_groups *s_flex_groups; 983 }; 984 985 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 986 { 987 return sb->s_fs_info; 988 } 989 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 990 { 991 return container_of(inode, struct ext4_inode_info, vfs_inode); 992 } 993 994 static inline struct timespec ext4_current_time(struct inode *inode) 995 { 996 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 997 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 998 } 999 1000 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1001 { 1002 return ino == EXT4_ROOT_INO || 1003 ino == EXT4_JOURNAL_INO || 1004 ino == EXT4_RESIZE_INO || 1005 (ino >= EXT4_FIRST_INO(sb) && 1006 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1007 } 1008 #else 1009 /* Assume that user mode programs are passing in an ext4fs superblock, not 1010 * a kernel struct super_block. This will allow us to call the feature-test 1011 * macros from user land. */ 1012 #define EXT4_SB(sb) (sb) 1013 #endif 1014 1015 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1016 1017 /* 1018 * Codes for operating systems 1019 */ 1020 #define EXT4_OS_LINUX 0 1021 #define EXT4_OS_HURD 1 1022 #define EXT4_OS_MASIX 2 1023 #define EXT4_OS_FREEBSD 3 1024 #define EXT4_OS_LITES 4 1025 1026 /* 1027 * Revision levels 1028 */ 1029 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1030 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1031 1032 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1033 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1034 1035 #define EXT4_GOOD_OLD_INODE_SIZE 128 1036 1037 /* 1038 * Feature set definitions 1039 */ 1040 1041 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1042 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1043 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1044 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1045 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1046 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1047 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1048 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1049 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1050 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1051 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1052 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1053 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1054 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1055 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1056 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1057 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1058 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1059 1060 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1061 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1062 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1063 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1064 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1065 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1066 1067 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1068 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1069 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1070 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1071 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1072 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1073 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1074 1075 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1076 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1077 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1078 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1079 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1080 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1081 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1082 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1083 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1084 1085 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1086 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1087 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1088 EXT4_FEATURE_INCOMPAT_META_BG| \ 1089 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1090 EXT4_FEATURE_INCOMPAT_64BIT| \ 1091 EXT4_FEATURE_INCOMPAT_FLEX_BG) 1092 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1093 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1094 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1095 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1096 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1097 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1098 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1099 1100 /* 1101 * Default values for user and/or group using reserved blocks 1102 */ 1103 #define EXT4_DEF_RESUID 0 1104 #define EXT4_DEF_RESGID 0 1105 1106 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1107 1108 /* 1109 * Default mount options 1110 */ 1111 #define EXT4_DEFM_DEBUG 0x0001 1112 #define EXT4_DEFM_BSDGROUPS 0x0002 1113 #define EXT4_DEFM_XATTR_USER 0x0004 1114 #define EXT4_DEFM_ACL 0x0008 1115 #define EXT4_DEFM_UID16 0x0010 1116 #define EXT4_DEFM_JMODE 0x0060 1117 #define EXT4_DEFM_JMODE_DATA 0x0020 1118 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1119 #define EXT4_DEFM_JMODE_WBACK 0x0060 1120 1121 /* 1122 * Default journal batch times 1123 */ 1124 #define EXT4_DEF_MIN_BATCH_TIME 0 1125 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1126 1127 /* 1128 * Minimum number of groups in a flexgroup before we separate out 1129 * directories into the first block group of a flexgroup 1130 */ 1131 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1132 1133 /* 1134 * Structure of a directory entry 1135 */ 1136 #define EXT4_NAME_LEN 255 1137 1138 struct ext4_dir_entry { 1139 __le32 inode; /* Inode number */ 1140 __le16 rec_len; /* Directory entry length */ 1141 __le16 name_len; /* Name length */ 1142 char name[EXT4_NAME_LEN]; /* File name */ 1143 }; 1144 1145 /* 1146 * The new version of the directory entry. Since EXT4 structures are 1147 * stored in intel byte order, and the name_len field could never be 1148 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1149 * file_type field. 1150 */ 1151 struct ext4_dir_entry_2 { 1152 __le32 inode; /* Inode number */ 1153 __le16 rec_len; /* Directory entry length */ 1154 __u8 name_len; /* Name length */ 1155 __u8 file_type; 1156 char name[EXT4_NAME_LEN]; /* File name */ 1157 }; 1158 1159 /* 1160 * Ext4 directory file types. Only the low 3 bits are used. The 1161 * other bits are reserved for now. 1162 */ 1163 #define EXT4_FT_UNKNOWN 0 1164 #define EXT4_FT_REG_FILE 1 1165 #define EXT4_FT_DIR 2 1166 #define EXT4_FT_CHRDEV 3 1167 #define EXT4_FT_BLKDEV 4 1168 #define EXT4_FT_FIFO 5 1169 #define EXT4_FT_SOCK 6 1170 #define EXT4_FT_SYMLINK 7 1171 1172 #define EXT4_FT_MAX 8 1173 1174 /* 1175 * EXT4_DIR_PAD defines the directory entries boundaries 1176 * 1177 * NOTE: It must be a multiple of 4 1178 */ 1179 #define EXT4_DIR_PAD 4 1180 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1181 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1182 ~EXT4_DIR_ROUND) 1183 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1184 1185 /* 1186 * Hash Tree Directory indexing 1187 * (c) Daniel Phillips, 2001 1188 */ 1189 1190 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1191 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1192 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 1193 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1194 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1195 1196 /* Legal values for the dx_root hash_version field: */ 1197 1198 #define DX_HASH_LEGACY 0 1199 #define DX_HASH_HALF_MD4 1 1200 #define DX_HASH_TEA 2 1201 #define DX_HASH_LEGACY_UNSIGNED 3 1202 #define DX_HASH_HALF_MD4_UNSIGNED 4 1203 #define DX_HASH_TEA_UNSIGNED 5 1204 1205 #ifdef __KERNEL__ 1206 1207 /* hash info structure used by the directory hash */ 1208 struct dx_hash_info 1209 { 1210 u32 hash; 1211 u32 minor_hash; 1212 int hash_version; 1213 u32 *seed; 1214 }; 1215 1216 #define EXT4_HTREE_EOF 0x7fffffff 1217 1218 /* 1219 * Control parameters used by ext4_htree_next_block 1220 */ 1221 #define HASH_NB_ALWAYS 1 1222 1223 1224 /* 1225 * Describe an inode's exact location on disk and in memory 1226 */ 1227 struct ext4_iloc 1228 { 1229 struct buffer_head *bh; 1230 unsigned long offset; 1231 ext4_group_t block_group; 1232 }; 1233 1234 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1235 { 1236 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1237 } 1238 1239 /* 1240 * This structure is stuffed into the struct file's private_data field 1241 * for directories. It is where we put information so that we can do 1242 * readdir operations in hash tree order. 1243 */ 1244 struct dir_private_info { 1245 struct rb_root root; 1246 struct rb_node *curr_node; 1247 struct fname *extra_fname; 1248 loff_t last_pos; 1249 __u32 curr_hash; 1250 __u32 curr_minor_hash; 1251 __u32 next_hash; 1252 }; 1253 1254 /* calculate the first block number of the group */ 1255 static inline ext4_fsblk_t 1256 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1257 { 1258 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1259 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1260 } 1261 1262 /* 1263 * Special error return code only used by dx_probe() and its callers. 1264 */ 1265 #define ERR_BAD_DX_DIR -75000 1266 1267 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1268 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1269 1270 extern struct proc_dir_entry *ext4_proc_root; 1271 1272 /* 1273 * Function prototypes 1274 */ 1275 1276 /* 1277 * Ok, these declarations are also in <linux/kernel.h> but none of the 1278 * ext4 source programs needs to include it so they are duplicated here. 1279 */ 1280 # define NORET_TYPE /**/ 1281 # define ATTRIB_NORET __attribute__((noreturn)) 1282 # define NORET_AND noreturn, 1283 1284 /* bitmap.c */ 1285 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1286 1287 /* balloc.c */ 1288 extern unsigned int ext4_block_group(struct super_block *sb, 1289 ext4_fsblk_t blocknr); 1290 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1291 ext4_fsblk_t blocknr); 1292 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1293 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1294 ext4_group_t group); 1295 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1296 ext4_fsblk_t goal, unsigned long *count, int *errp); 1297 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1298 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1299 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1300 ext4_fsblk_t block, unsigned long count, int metadata); 1301 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1302 ext4_fsblk_t block, unsigned long count); 1303 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1304 extern void ext4_check_blocks_bitmap(struct super_block *); 1305 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1306 ext4_group_t block_group, 1307 struct buffer_head ** bh); 1308 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1309 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1310 ext4_group_t block_group); 1311 extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1312 struct buffer_head *bh, 1313 ext4_group_t group, 1314 struct ext4_group_desc *desc); 1315 #define ext4_free_blocks_after_init(sb, group, desc) \ 1316 ext4_init_block_bitmap(sb, NULL, group, desc) 1317 1318 /* dir.c */ 1319 extern int ext4_check_dir_entry(const char *, struct inode *, 1320 struct ext4_dir_entry_2 *, 1321 struct buffer_head *, unsigned int); 1322 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1323 __u32 minor_hash, 1324 struct ext4_dir_entry_2 *dirent); 1325 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1326 1327 /* fsync.c */ 1328 extern int ext4_sync_file(struct file *, struct dentry *, int); 1329 1330 /* hash.c */ 1331 extern int ext4fs_dirhash(const char *name, int len, struct 1332 dx_hash_info *hinfo); 1333 1334 /* ialloc.c */ 1335 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 1336 const struct qstr *qstr, __u32 goal); 1337 extern void ext4_free_inode(handle_t *, struct inode *); 1338 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1339 extern unsigned long ext4_count_free_inodes(struct super_block *); 1340 extern unsigned long ext4_count_dirs(struct super_block *); 1341 extern void ext4_check_inodes_bitmap(struct super_block *); 1342 extern unsigned ext4_init_inode_bitmap(struct super_block *sb, 1343 struct buffer_head *bh, 1344 ext4_group_t group, 1345 struct ext4_group_desc *desc); 1346 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1347 1348 /* mballoc.c */ 1349 extern long ext4_mb_stats; 1350 extern long ext4_mb_max_to_scan; 1351 extern int ext4_mb_init(struct super_block *, int); 1352 extern int ext4_mb_release(struct super_block *); 1353 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1354 struct ext4_allocation_request *, int *); 1355 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1356 extern void ext4_discard_preallocations(struct inode *); 1357 extern int __init init_ext4_mballoc(void); 1358 extern void exit_ext4_mballoc(void); 1359 extern void ext4_mb_free_blocks(handle_t *, struct inode *, 1360 ext4_fsblk_t, unsigned long, int, unsigned long *); 1361 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1362 ext4_group_t i, struct ext4_group_desc *desc); 1363 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1364 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1365 ext4_group_t, int); 1366 /* inode.c */ 1367 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 1368 struct buffer_head *bh, ext4_fsblk_t blocknr); 1369 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1370 ext4_lblk_t, int, int *); 1371 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1372 ext4_lblk_t, int, int *); 1373 int ext4_get_block(struct inode *inode, sector_t iblock, 1374 struct buffer_head *bh_result, int create); 1375 1376 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1377 extern int ext4_write_inode(struct inode *, int); 1378 extern int ext4_setattr(struct dentry *, struct iattr *); 1379 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1380 struct kstat *stat); 1381 extern void ext4_delete_inode(struct inode *); 1382 extern int ext4_sync_inode(handle_t *, struct inode *); 1383 extern void ext4_dirty_inode(struct inode *); 1384 extern int ext4_change_inode_journal_flag(struct inode *, int); 1385 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1386 extern int ext4_can_truncate(struct inode *inode); 1387 extern void ext4_truncate(struct inode *); 1388 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1389 extern void ext4_set_inode_flags(struct inode *); 1390 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1391 extern int ext4_alloc_da_blocks(struct inode *inode); 1392 extern void ext4_set_aops(struct inode *inode); 1393 extern int ext4_writepage_trans_blocks(struct inode *); 1394 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1395 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1396 extern int ext4_block_truncate_page(handle_t *handle, 1397 struct address_space *mapping, loff_t from); 1398 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1399 extern qsize_t ext4_get_reserved_space(struct inode *inode); 1400 1401 /* ioctl.c */ 1402 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1403 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1404 1405 /* migrate.c */ 1406 extern int ext4_ext_migrate(struct inode *); 1407 1408 /* namei.c */ 1409 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 1410 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 1411 extern int ext4_orphan_add(handle_t *, struct inode *); 1412 extern int ext4_orphan_del(handle_t *, struct inode *); 1413 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1414 __u32 start_minor_hash, __u32 *next_hash); 1415 1416 /* resize.c */ 1417 extern int ext4_group_add(struct super_block *sb, 1418 struct ext4_new_group_data *input); 1419 extern int ext4_group_extend(struct super_block *sb, 1420 struct ext4_super_block *es, 1421 ext4_fsblk_t n_blocks_count); 1422 1423 /* super.c */ 1424 extern void ext4_error(struct super_block *, const char *, const char *, ...) 1425 __attribute__ ((format (printf, 3, 4))); 1426 extern void __ext4_std_error(struct super_block *, const char *, int); 1427 extern void ext4_abort(struct super_block *, const char *, const char *, ...) 1428 __attribute__ ((format (printf, 3, 4))); 1429 extern void ext4_warning(struct super_block *, const char *, const char *, ...) 1430 __attribute__ ((format (printf, 3, 4))); 1431 extern void ext4_msg(struct super_block *, const char *, const char *, ...) 1432 __attribute__ ((format (printf, 3, 4))); 1433 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 1434 const char *, const char *, ...) 1435 __attribute__ ((format (printf, 4, 5))); 1436 extern void ext4_update_dynamic_rev(struct super_block *sb); 1437 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1438 __u32 compat); 1439 extern int ext4_update_rocompat_feature(handle_t *handle, 1440 struct super_block *sb, __u32 rocompat); 1441 extern int ext4_update_incompat_feature(handle_t *handle, 1442 struct super_block *sb, __u32 incompat); 1443 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1444 struct ext4_group_desc *bg); 1445 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1446 struct ext4_group_desc *bg); 1447 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1448 struct ext4_group_desc *bg); 1449 extern __u32 ext4_free_blks_count(struct super_block *sb, 1450 struct ext4_group_desc *bg); 1451 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1452 struct ext4_group_desc *bg); 1453 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1454 struct ext4_group_desc *bg); 1455 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1456 struct ext4_group_desc *bg); 1457 extern void ext4_block_bitmap_set(struct super_block *sb, 1458 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1459 extern void ext4_inode_bitmap_set(struct super_block *sb, 1460 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1461 extern void ext4_inode_table_set(struct super_block *sb, 1462 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1463 extern void ext4_free_blks_set(struct super_block *sb, 1464 struct ext4_group_desc *bg, __u32 count); 1465 extern void ext4_free_inodes_set(struct super_block *sb, 1466 struct ext4_group_desc *bg, __u32 count); 1467 extern void ext4_used_dirs_set(struct super_block *sb, 1468 struct ext4_group_desc *bg, __u32 count); 1469 extern void ext4_itable_unused_set(struct super_block *sb, 1470 struct ext4_group_desc *bg, __u32 count); 1471 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1472 struct ext4_group_desc *gdp); 1473 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1474 struct ext4_group_desc *gdp); 1475 1476 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1477 { 1478 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1479 le32_to_cpu(es->s_blocks_count_lo); 1480 } 1481 1482 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1483 { 1484 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1485 le32_to_cpu(es->s_r_blocks_count_lo); 1486 } 1487 1488 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1489 { 1490 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1491 le32_to_cpu(es->s_free_blocks_count_lo); 1492 } 1493 1494 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1495 ext4_fsblk_t blk) 1496 { 1497 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1498 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1499 } 1500 1501 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1502 ext4_fsblk_t blk) 1503 { 1504 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1505 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1506 } 1507 1508 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1509 ext4_fsblk_t blk) 1510 { 1511 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1512 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1513 } 1514 1515 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1516 { 1517 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1518 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1519 le32_to_cpu(raw_inode->i_size_lo); 1520 else 1521 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1522 } 1523 1524 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1525 { 1526 raw_inode->i_size_lo = cpu_to_le32(i_size); 1527 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1528 } 1529 1530 static inline 1531 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1532 ext4_group_t group) 1533 { 1534 struct ext4_group_info ***grp_info; 1535 long indexv, indexh; 1536 grp_info = EXT4_SB(sb)->s_group_info; 1537 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1538 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1539 return grp_info[indexv][indexh]; 1540 } 1541 1542 /* 1543 * Reading s_groups_count requires using smp_rmb() afterwards. See 1544 * the locking protocol documented in the comments of ext4_group_add() 1545 * in resize.c 1546 */ 1547 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1548 { 1549 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1550 1551 smp_rmb(); 1552 return ngroups; 1553 } 1554 1555 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1556 ext4_group_t block_group) 1557 { 1558 return block_group >> sbi->s_log_groups_per_flex; 1559 } 1560 1561 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1562 { 1563 return 1 << sbi->s_log_groups_per_flex; 1564 } 1565 1566 #define ext4_std_error(sb, errno) \ 1567 do { \ 1568 if ((errno)) \ 1569 __ext4_std_error((sb), __func__, (errno)); \ 1570 } while (0) 1571 1572 #ifdef CONFIG_SMP 1573 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1574 * counters. So we need to make sure we have free blocks more 1575 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1576 */ 1577 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1578 #else 1579 #define EXT4_FREEBLOCKS_WATERMARK 0 1580 #endif 1581 1582 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1583 { 1584 /* 1585 * XXX: replace with spinlock if seen contended -bzzz 1586 */ 1587 down_write(&EXT4_I(inode)->i_data_sem); 1588 if (newsize > EXT4_I(inode)->i_disksize) 1589 EXT4_I(inode)->i_disksize = newsize; 1590 up_write(&EXT4_I(inode)->i_data_sem); 1591 return ; 1592 } 1593 1594 struct ext4_group_info { 1595 unsigned long bb_state; 1596 struct rb_root bb_free_root; 1597 ext4_grpblk_t bb_first_free; /* first free block */ 1598 ext4_grpblk_t bb_free; /* total free blocks */ 1599 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 1600 struct list_head bb_prealloc_list; 1601 #ifdef DOUBLE_CHECK 1602 void *bb_bitmap; 1603 #endif 1604 struct rw_semaphore alloc_sem; 1605 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 1606 * regions, index is order. 1607 * bb_counters[3] = 5 means 1608 * 5 free 8-block regions. */ 1609 }; 1610 1611 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1612 1613 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1614 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1615 1616 #define EXT4_MAX_CONTENTION 8 1617 #define EXT4_CONTENTION_THRESHOLD 2 1618 1619 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 1620 ext4_group_t group) 1621 { 1622 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 1623 } 1624 1625 /* 1626 * Returns true if the filesystem is busy enough that attempts to 1627 * access the block group locks has run into contention. 1628 */ 1629 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 1630 { 1631 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 1632 } 1633 1634 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1635 { 1636 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 1637 if (spin_trylock(lock)) 1638 /* 1639 * We're able to grab the lock right away, so drop the 1640 * lock contention counter. 1641 */ 1642 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 1643 else { 1644 /* 1645 * The lock is busy, so bump the contention counter, 1646 * and then wait on the spin lock. 1647 */ 1648 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 1649 EXT4_MAX_CONTENTION); 1650 spin_lock(lock); 1651 } 1652 } 1653 1654 static inline void ext4_unlock_group(struct super_block *sb, 1655 ext4_group_t group) 1656 { 1657 spin_unlock(ext4_group_lock_ptr(sb, group)); 1658 } 1659 1660 /* 1661 * Inodes and files operations 1662 */ 1663 1664 /* dir.c */ 1665 extern const struct file_operations ext4_dir_operations; 1666 1667 /* file.c */ 1668 extern const struct inode_operations ext4_file_inode_operations; 1669 extern const struct file_operations ext4_file_operations; 1670 1671 /* namei.c */ 1672 extern const struct inode_operations ext4_dir_inode_operations; 1673 extern const struct inode_operations ext4_special_inode_operations; 1674 extern struct dentry *ext4_get_parent(struct dentry *child); 1675 1676 /* symlink.c */ 1677 extern const struct inode_operations ext4_symlink_inode_operations; 1678 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1679 1680 /* block_validity */ 1681 extern void ext4_release_system_zone(struct super_block *sb); 1682 extern int ext4_setup_system_zone(struct super_block *sb); 1683 extern int __init init_ext4_system_zone(void); 1684 extern void exit_ext4_system_zone(void); 1685 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 1686 ext4_fsblk_t start_blk, 1687 unsigned int count); 1688 1689 /* extents.c */ 1690 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1691 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1692 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1693 int chunk); 1694 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1695 ext4_lblk_t iblock, unsigned int max_blocks, 1696 struct buffer_head *bh_result, int flags); 1697 extern void ext4_ext_truncate(struct inode *); 1698 extern void ext4_ext_init(struct super_block *); 1699 extern void ext4_ext_release(struct super_block *); 1700 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1701 loff_t len); 1702 extern int ext4_get_blocks(handle_t *handle, struct inode *inode, 1703 sector_t block, unsigned int max_blocks, 1704 struct buffer_head *bh, int flags); 1705 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1706 __u64 start, __u64 len); 1707 /* move_extent.c */ 1708 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 1709 __u64 start_orig, __u64 start_donor, 1710 __u64 len, __u64 *moved_len); 1711 1712 1713 /* 1714 * Add new method to test wether block and inode bitmaps are properly 1715 * initialized. With uninit_bg reading the block from disk is not enough 1716 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1717 */ 1718 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1719 1720 static inline int bitmap_uptodate(struct buffer_head *bh) 1721 { 1722 return (buffer_uptodate(bh) && 1723 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1724 } 1725 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1726 { 1727 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1728 } 1729 1730 #endif /* __KERNEL__ */ 1731 1732 #endif /* _EXT4_H */ 1733