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 #define EXT4_ERROR_INODE(inode, fmt, a...) \ 57 ext4_error_inode(__func__, (inode), (fmt), ## a); 58 59 #define EXT4_ERROR_FILE(file, fmt, a...) \ 60 ext4_error_file(__func__, (file), (fmt), ## a); 61 62 /* data type for block offset of block group */ 63 typedef int ext4_grpblk_t; 64 65 /* data type for filesystem-wide blocks number */ 66 typedef unsigned long long ext4_fsblk_t; 67 68 /* data type for file logical block number */ 69 typedef __u32 ext4_lblk_t; 70 71 /* data type for block group number */ 72 typedef unsigned int ext4_group_t; 73 74 /* 75 * Flags used in mballoc's allocation_context flags field. 76 * 77 * Also used to show what's going on for debugging purposes when the 78 * flag field is exported via the traceport interface 79 */ 80 81 /* prefer goal again. length */ 82 #define EXT4_MB_HINT_MERGE 0x0001 83 /* blocks already reserved */ 84 #define EXT4_MB_HINT_RESERVED 0x0002 85 /* metadata is being allocated */ 86 #define EXT4_MB_HINT_METADATA 0x0004 87 /* first blocks in the file */ 88 #define EXT4_MB_HINT_FIRST 0x0008 89 /* search for the best chunk */ 90 #define EXT4_MB_HINT_BEST 0x0010 91 /* data is being allocated */ 92 #define EXT4_MB_HINT_DATA 0x0020 93 /* don't preallocate (for tails) */ 94 #define EXT4_MB_HINT_NOPREALLOC 0x0040 95 /* allocate for locality group */ 96 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 97 /* allocate goal blocks or none */ 98 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 99 /* goal is meaningful */ 100 #define EXT4_MB_HINT_TRY_GOAL 0x0200 101 /* blocks already pre-reserved by delayed allocation */ 102 #define EXT4_MB_DELALLOC_RESERVED 0x0400 103 /* We are doing stream allocation */ 104 #define EXT4_MB_STREAM_ALLOC 0x0800 105 106 107 struct ext4_allocation_request { 108 /* target inode for block we're allocating */ 109 struct inode *inode; 110 /* how many blocks we want to allocate */ 111 unsigned int len; 112 /* logical block in target inode */ 113 ext4_lblk_t logical; 114 /* the closest logical allocated block to the left */ 115 ext4_lblk_t lleft; 116 /* the closest logical allocated block to the right */ 117 ext4_lblk_t lright; 118 /* phys. target (a hint) */ 119 ext4_fsblk_t goal; 120 /* phys. block for the closest logical allocated block to the left */ 121 ext4_fsblk_t pleft; 122 /* phys. block for the closest logical allocated block to the right */ 123 ext4_fsblk_t pright; 124 /* flags. see above EXT4_MB_HINT_* */ 125 unsigned int flags; 126 }; 127 128 /* 129 * Logical to physical block mapping, used by ext4_map_blocks() 130 * 131 * This structure is used to pass requests into ext4_map_blocks() as 132 * well as to store the information returned by ext4_map_blocks(). It 133 * takes less room on the stack than a struct buffer_head. 134 */ 135 #define EXT4_MAP_NEW (1 << BH_New) 136 #define EXT4_MAP_MAPPED (1 << BH_Mapped) 137 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 138 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 139 #define EXT4_MAP_UNINIT (1 << BH_Uninit) 140 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 141 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 142 EXT4_MAP_UNINIT) 143 144 struct ext4_map_blocks { 145 ext4_fsblk_t m_pblk; 146 ext4_lblk_t m_lblk; 147 unsigned int m_len; 148 unsigned int m_flags; 149 }; 150 151 /* 152 * For delayed allocation tracking 153 */ 154 struct mpage_da_data { 155 struct inode *inode; 156 sector_t b_blocknr; /* start block number of extent */ 157 size_t b_size; /* size of extent */ 158 unsigned long b_state; /* state of the extent */ 159 unsigned long first_page, next_page; /* extent of pages */ 160 struct writeback_control *wbc; 161 int io_done; 162 int pages_written; 163 int retval; 164 }; 165 #define EXT4_IO_UNWRITTEN 0x1 166 typedef struct ext4_io_end { 167 struct list_head list; /* per-file finished AIO list */ 168 struct inode *inode; /* file being written to */ 169 unsigned int flag; /* unwritten or not */ 170 struct page *page; /* page struct for buffer write */ 171 loff_t offset; /* offset in the file */ 172 ssize_t size; /* size of the extent */ 173 struct work_struct work; /* data work queue */ 174 } ext4_io_end_t; 175 176 /* 177 * Special inodes numbers 178 */ 179 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 180 #define EXT4_ROOT_INO 2 /* Root inode */ 181 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 182 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 183 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 184 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 185 186 /* First non-reserved inode for old ext4 filesystems */ 187 #define EXT4_GOOD_OLD_FIRST_INO 11 188 189 /* 190 * Maximal count of links to a file 191 */ 192 #define EXT4_LINK_MAX 65000 193 194 /* 195 * Macro-instructions used to manage several block sizes 196 */ 197 #define EXT4_MIN_BLOCK_SIZE 1024 198 #define EXT4_MAX_BLOCK_SIZE 65536 199 #define EXT4_MIN_BLOCK_LOG_SIZE 10 200 #ifdef __KERNEL__ 201 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 202 #else 203 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 204 #endif 205 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 206 #ifdef __KERNEL__ 207 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 208 #else 209 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 210 #endif 211 #ifdef __KERNEL__ 212 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 213 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 214 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 215 #else 216 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 217 EXT4_GOOD_OLD_INODE_SIZE : \ 218 (s)->s_inode_size) 219 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 220 EXT4_GOOD_OLD_FIRST_INO : \ 221 (s)->s_first_ino) 222 #endif 223 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 224 225 /* 226 * Structure of a blocks group descriptor 227 */ 228 struct ext4_group_desc 229 { 230 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 231 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 232 __le32 bg_inode_table_lo; /* Inodes table block */ 233 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 234 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 235 __le16 bg_used_dirs_count_lo; /* Directories count */ 236 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 237 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 238 __le16 bg_itable_unused_lo; /* Unused inodes count */ 239 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 240 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 241 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 242 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 243 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 244 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 245 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 246 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 247 __u32 bg_reserved2[3]; 248 }; 249 250 /* 251 * Structure of a flex block group info 252 */ 253 254 struct flex_groups { 255 atomic_t free_inodes; 256 atomic_t free_blocks; 257 atomic_t used_dirs; 258 }; 259 260 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 261 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 262 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 263 264 /* 265 * Macro-instructions used to manage group descriptors 266 */ 267 #define EXT4_MIN_DESC_SIZE 32 268 #define EXT4_MIN_DESC_SIZE_64BIT 64 269 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 270 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 271 #ifdef __KERNEL__ 272 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 273 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 274 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 275 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 276 #else 277 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 278 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 279 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 280 #endif 281 282 /* 283 * Constants relative to the data blocks 284 */ 285 #define EXT4_NDIR_BLOCKS 12 286 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 287 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 288 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 289 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 290 291 /* 292 * Inode flags 293 */ 294 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 295 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 296 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 297 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 298 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 299 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 300 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 301 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 302 /* Reserved for compression usage... */ 303 #define EXT4_DIRTY_FL 0x00000100 304 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 305 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 306 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 307 /* End compression flags --- maybe not all used */ 308 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 309 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 310 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 311 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 312 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 313 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 314 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 315 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 316 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 317 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 318 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 319 320 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 321 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 322 323 /* Flags that should be inherited by new inodes from their parent. */ 324 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 325 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 326 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 327 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 328 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 329 330 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 331 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 332 333 /* Flags that are appropriate for non-directories/regular files. */ 334 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 335 336 /* Mask out flags that are inappropriate for the given type of inode. */ 337 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 338 { 339 if (S_ISDIR(mode)) 340 return flags; 341 else if (S_ISREG(mode)) 342 return flags & EXT4_REG_FLMASK; 343 else 344 return flags & EXT4_OTHER_FLMASK; 345 } 346 347 /* Used to pass group descriptor data when online resize is done */ 348 struct ext4_new_group_input { 349 __u32 group; /* Group number for this data */ 350 __u64 block_bitmap; /* Absolute block number of block bitmap */ 351 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 352 __u64 inode_table; /* Absolute block number of inode table start */ 353 __u32 blocks_count; /* Total number of blocks in this group */ 354 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 355 __u16 unused; 356 }; 357 358 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 359 struct ext4_new_group_data { 360 __u32 group; 361 __u64 block_bitmap; 362 __u64 inode_bitmap; 363 __u64 inode_table; 364 __u32 blocks_count; 365 __u16 reserved_blocks; 366 __u16 unused; 367 __u32 free_blocks_count; 368 }; 369 370 /* 371 * Flags used by ext4_get_blocks() 372 */ 373 /* Allocate any needed blocks and/or convert an unitialized 374 extent to be an initialized ext4 */ 375 #define EXT4_GET_BLOCKS_CREATE 0x0001 376 /* Request the creation of an unitialized extent */ 377 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 378 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 379 EXT4_GET_BLOCKS_CREATE) 380 /* Caller is from the delayed allocation writeout path, 381 so set the magic i_delalloc_reserve_flag after taking the 382 inode allocation semaphore for */ 383 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 384 /* caller is from the direct IO path, request to creation of an 385 unitialized extents if not allocated, split the uninitialized 386 extent if blocks has been preallocated already*/ 387 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 388 #define EXT4_GET_BLOCKS_CONVERT 0x0010 389 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 390 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 391 /* Convert extent to initialized after IO complete */ 392 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 393 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 394 395 /* 396 * Flags used by ext4_free_blocks 397 */ 398 #define EXT4_FREE_BLOCKS_METADATA 0x0001 399 #define EXT4_FREE_BLOCKS_FORGET 0x0002 400 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 401 402 /* 403 * ioctl commands 404 */ 405 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 406 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 407 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 408 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 409 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 410 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 411 #ifdef CONFIG_JBD2_DEBUG 412 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 413 #endif 414 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 415 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 416 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 417 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 418 #define EXT4_IOC_MIGRATE _IO('f', 9) 419 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 420 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 421 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 422 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 423 424 /* 425 * ioctl commands in 32 bit emulation 426 */ 427 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 428 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 429 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 430 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 431 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 432 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 433 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 434 #ifdef CONFIG_JBD2_DEBUG 435 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 436 #endif 437 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 438 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 439 440 441 /* 442 * Mount options 443 */ 444 struct ext4_mount_options { 445 unsigned long s_mount_opt; 446 uid_t s_resuid; 447 gid_t s_resgid; 448 unsigned long s_commit_interval; 449 u32 s_min_batch_time, s_max_batch_time; 450 #ifdef CONFIG_QUOTA 451 int s_jquota_fmt; 452 char *s_qf_names[MAXQUOTAS]; 453 #endif 454 }; 455 456 /* Max physical block we can addres w/o extents */ 457 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 458 459 /* 460 * Structure of an inode on the disk 461 */ 462 struct ext4_inode { 463 __le16 i_mode; /* File mode */ 464 __le16 i_uid; /* Low 16 bits of Owner Uid */ 465 __le32 i_size_lo; /* Size in bytes */ 466 __le32 i_atime; /* Access time */ 467 __le32 i_ctime; /* Inode Change time */ 468 __le32 i_mtime; /* Modification time */ 469 __le32 i_dtime; /* Deletion Time */ 470 __le16 i_gid; /* Low 16 bits of Group Id */ 471 __le16 i_links_count; /* Links count */ 472 __le32 i_blocks_lo; /* Blocks count */ 473 __le32 i_flags; /* File flags */ 474 union { 475 struct { 476 __le32 l_i_version; 477 } linux1; 478 struct { 479 __u32 h_i_translator; 480 } hurd1; 481 struct { 482 __u32 m_i_reserved1; 483 } masix1; 484 } osd1; /* OS dependent 1 */ 485 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 486 __le32 i_generation; /* File version (for NFS) */ 487 __le32 i_file_acl_lo; /* File ACL */ 488 __le32 i_size_high; 489 __le32 i_obso_faddr; /* Obsoleted fragment address */ 490 union { 491 struct { 492 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 493 __le16 l_i_file_acl_high; 494 __le16 l_i_uid_high; /* these 2 fields */ 495 __le16 l_i_gid_high; /* were reserved2[0] */ 496 __u32 l_i_reserved2; 497 } linux2; 498 struct { 499 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 500 __u16 h_i_mode_high; 501 __u16 h_i_uid_high; 502 __u16 h_i_gid_high; 503 __u32 h_i_author; 504 } hurd2; 505 struct { 506 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 507 __le16 m_i_file_acl_high; 508 __u32 m_i_reserved2[2]; 509 } masix2; 510 } osd2; /* OS dependent 2 */ 511 __le16 i_extra_isize; 512 __le16 i_pad1; 513 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 514 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 515 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 516 __le32 i_crtime; /* File Creation time */ 517 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 518 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 519 }; 520 521 struct move_extent { 522 __u32 reserved; /* should be zero */ 523 __u32 donor_fd; /* donor file descriptor */ 524 __u64 orig_start; /* logical start offset in block for orig */ 525 __u64 donor_start; /* logical start offset in block for donor */ 526 __u64 len; /* block length to be moved */ 527 __u64 moved_len; /* moved block length */ 528 }; 529 530 #define EXT4_EPOCH_BITS 2 531 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 532 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 533 534 /* 535 * Extended fields will fit into an inode if the filesystem was formatted 536 * with large inodes (-I 256 or larger) and there are not currently any EAs 537 * consuming all of the available space. For new inodes we always reserve 538 * enough space for the kernel's known extended fields, but for inodes 539 * created with an old kernel this might not have been the case. None of 540 * the extended inode fields is critical for correct filesystem operation. 541 * This macro checks if a certain field fits in the inode. Note that 542 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 543 */ 544 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 545 ((offsetof(typeof(*ext4_inode), field) + \ 546 sizeof((ext4_inode)->field)) \ 547 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 548 (einode)->i_extra_isize)) \ 549 550 static inline __le32 ext4_encode_extra_time(struct timespec *time) 551 { 552 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 553 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 554 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 555 } 556 557 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 558 { 559 if (sizeof(time->tv_sec) > 4) 560 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 561 << 32; 562 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 563 } 564 565 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 566 do { \ 567 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 568 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 569 (raw_inode)->xtime ## _extra = \ 570 ext4_encode_extra_time(&(inode)->xtime); \ 571 } while (0) 572 573 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 574 do { \ 575 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 576 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 577 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 578 (raw_inode)->xtime ## _extra = \ 579 ext4_encode_extra_time(&(einode)->xtime); \ 580 } while (0) 581 582 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 583 do { \ 584 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 585 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 586 ext4_decode_extra_time(&(inode)->xtime, \ 587 raw_inode->xtime ## _extra); \ 588 } while (0) 589 590 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 591 do { \ 592 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 593 (einode)->xtime.tv_sec = \ 594 (signed)le32_to_cpu((raw_inode)->xtime); \ 595 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 596 ext4_decode_extra_time(&(einode)->xtime, \ 597 raw_inode->xtime ## _extra); \ 598 } while (0) 599 600 #define i_disk_version osd1.linux1.l_i_version 601 602 #if defined(__KERNEL__) || defined(__linux__) 603 #define i_reserved1 osd1.linux1.l_i_reserved1 604 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 605 #define i_blocks_high osd2.linux2.l_i_blocks_high 606 #define i_uid_low i_uid 607 #define i_gid_low i_gid 608 #define i_uid_high osd2.linux2.l_i_uid_high 609 #define i_gid_high osd2.linux2.l_i_gid_high 610 #define i_reserved2 osd2.linux2.l_i_reserved2 611 612 #elif defined(__GNU__) 613 614 #define i_translator osd1.hurd1.h_i_translator 615 #define i_uid_high osd2.hurd2.h_i_uid_high 616 #define i_gid_high osd2.hurd2.h_i_gid_high 617 #define i_author osd2.hurd2.h_i_author 618 619 #elif defined(__masix__) 620 621 #define i_reserved1 osd1.masix1.m_i_reserved1 622 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 623 #define i_reserved2 osd2.masix2.m_i_reserved2 624 625 #endif /* defined(__KERNEL__) || defined(__linux__) */ 626 627 /* 628 * storage for cached extent 629 */ 630 struct ext4_ext_cache { 631 ext4_fsblk_t ec_start; 632 ext4_lblk_t ec_block; 633 __u32 ec_len; /* must be 32bit to return holes */ 634 __u32 ec_type; 635 }; 636 637 /* 638 * fourth extended file system inode data in memory 639 */ 640 struct ext4_inode_info { 641 __le32 i_data[15]; /* unconverted */ 642 __u32 i_flags; 643 ext4_fsblk_t i_file_acl; 644 __u32 i_dtime; 645 646 /* 647 * i_block_group is the number of the block group which contains 648 * this file's inode. Constant across the lifetime of the inode, 649 * it is ued for making block allocation decisions - we try to 650 * place a file's data blocks near its inode block, and new inodes 651 * near to their parent directory's inode. 652 */ 653 ext4_group_t i_block_group; 654 unsigned long i_state_flags; /* Dynamic state flags */ 655 656 ext4_lblk_t i_dir_start_lookup; 657 #ifdef CONFIG_EXT4_FS_XATTR 658 /* 659 * Extended attributes can be read independently of the main file 660 * data. Taking i_mutex even when reading would cause contention 661 * between readers of EAs and writers of regular file data, so 662 * instead we synchronize on xattr_sem when reading or changing 663 * EAs. 664 */ 665 struct rw_semaphore xattr_sem; 666 #endif 667 668 struct list_head i_orphan; /* unlinked but open inodes */ 669 670 /* 671 * i_disksize keeps track of what the inode size is ON DISK, not 672 * in memory. During truncate, i_size is set to the new size by 673 * the VFS prior to calling ext4_truncate(), but the filesystem won't 674 * set i_disksize to 0 until the truncate is actually under way. 675 * 676 * The intent is that i_disksize always represents the blocks which 677 * are used by this file. This allows recovery to restart truncate 678 * on orphans if we crash during truncate. We actually write i_disksize 679 * into the on-disk inode when writing inodes out, instead of i_size. 680 * 681 * The only time when i_disksize and i_size may be different is when 682 * a truncate is in progress. The only things which change i_disksize 683 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 684 */ 685 loff_t i_disksize; 686 687 /* 688 * i_data_sem is for serialising ext4_truncate() against 689 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 690 * data tree are chopped off during truncate. We can't do that in 691 * ext4 because whenever we perform intermediate commits during 692 * truncate, the inode and all the metadata blocks *must* be in a 693 * consistent state which allows truncation of the orphans to restart 694 * during recovery. Hence we must fix the get_block-vs-truncate race 695 * by other means, so we have i_data_sem. 696 */ 697 struct rw_semaphore i_data_sem; 698 struct inode vfs_inode; 699 struct jbd2_inode jinode; 700 701 struct ext4_ext_cache i_cached_extent; 702 /* 703 * File creation time. Its function is same as that of 704 * struct timespec i_{a,c,m}time in the generic inode. 705 */ 706 struct timespec i_crtime; 707 708 /* mballoc */ 709 struct list_head i_prealloc_list; 710 spinlock_t i_prealloc_lock; 711 712 /* ialloc */ 713 ext4_group_t i_last_alloc_group; 714 715 /* allocation reservation info for delalloc */ 716 unsigned int i_reserved_data_blocks; 717 unsigned int i_reserved_meta_blocks; 718 unsigned int i_allocated_meta_blocks; 719 unsigned short i_delalloc_reserved_flag; 720 sector_t i_da_metadata_calc_last_lblock; 721 int i_da_metadata_calc_len; 722 723 /* on-disk additional length */ 724 __u16 i_extra_isize; 725 726 spinlock_t i_block_reservation_lock; 727 #ifdef CONFIG_QUOTA 728 /* quota space reservation, managed internally by quota code */ 729 qsize_t i_reserved_quota; 730 #endif 731 732 /* completed IOs that might need unwritten extents handling */ 733 struct list_head i_completed_io_list; 734 spinlock_t i_completed_io_lock; 735 /* current io_end structure for async DIO write*/ 736 ext4_io_end_t *cur_aio_dio; 737 738 /* 739 * Transactions that contain inode's metadata needed to complete 740 * fsync and fdatasync, respectively. 741 */ 742 tid_t i_sync_tid; 743 tid_t i_datasync_tid; 744 }; 745 746 /* 747 * File system states 748 */ 749 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 750 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 751 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 752 753 /* 754 * Misc. filesystem flags 755 */ 756 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 757 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 758 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 759 760 /* 761 * Mount flags 762 */ 763 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 764 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 765 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 766 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 767 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 768 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 769 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 770 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 771 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 772 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 773 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 774 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 775 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 776 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 777 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 778 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 779 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 780 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 781 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 782 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 783 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 784 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 785 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 786 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 787 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 788 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 789 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 790 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 791 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 792 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 793 794 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 795 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 796 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 797 EXT4_MOUNT_##opt) 798 799 #define ext4_set_bit ext2_set_bit 800 #define ext4_set_bit_atomic ext2_set_bit_atomic 801 #define ext4_clear_bit ext2_clear_bit 802 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 803 #define ext4_test_bit ext2_test_bit 804 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 805 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 806 #define ext4_find_next_bit ext2_find_next_bit 807 808 /* 809 * Maximal mount counts between two filesystem checks 810 */ 811 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 812 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 813 814 /* 815 * Behaviour when detecting errors 816 */ 817 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 818 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 819 #define EXT4_ERRORS_PANIC 3 /* Panic */ 820 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 821 822 /* 823 * Structure of the super block 824 */ 825 struct ext4_super_block { 826 /*00*/ __le32 s_inodes_count; /* Inodes count */ 827 __le32 s_blocks_count_lo; /* Blocks count */ 828 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 829 __le32 s_free_blocks_count_lo; /* Free blocks count */ 830 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 831 __le32 s_first_data_block; /* First Data Block */ 832 __le32 s_log_block_size; /* Block size */ 833 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 834 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 835 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 836 __le32 s_inodes_per_group; /* # Inodes per group */ 837 __le32 s_mtime; /* Mount time */ 838 /*30*/ __le32 s_wtime; /* Write time */ 839 __le16 s_mnt_count; /* Mount count */ 840 __le16 s_max_mnt_count; /* Maximal mount count */ 841 __le16 s_magic; /* Magic signature */ 842 __le16 s_state; /* File system state */ 843 __le16 s_errors; /* Behaviour when detecting errors */ 844 __le16 s_minor_rev_level; /* minor revision level */ 845 /*40*/ __le32 s_lastcheck; /* time of last check */ 846 __le32 s_checkinterval; /* max. time between checks */ 847 __le32 s_creator_os; /* OS */ 848 __le32 s_rev_level; /* Revision level */ 849 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 850 __le16 s_def_resgid; /* Default gid for reserved blocks */ 851 /* 852 * These fields are for EXT4_DYNAMIC_REV superblocks only. 853 * 854 * Note: the difference between the compatible feature set and 855 * the incompatible feature set is that if there is a bit set 856 * in the incompatible feature set that the kernel doesn't 857 * know about, it should refuse to mount the filesystem. 858 * 859 * e2fsck's requirements are more strict; if it doesn't know 860 * about a feature in either the compatible or incompatible 861 * feature set, it must abort and not try to meddle with 862 * things it doesn't understand... 863 */ 864 __le32 s_first_ino; /* First non-reserved inode */ 865 __le16 s_inode_size; /* size of inode structure */ 866 __le16 s_block_group_nr; /* block group # of this superblock */ 867 __le32 s_feature_compat; /* compatible feature set */ 868 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 869 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 870 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 871 /*78*/ char s_volume_name[16]; /* volume name */ 872 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 873 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 874 /* 875 * Performance hints. Directory preallocation should only 876 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 877 */ 878 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 879 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 880 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 881 /* 882 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 883 */ 884 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 885 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 886 __le32 s_journal_dev; /* device number of journal file */ 887 __le32 s_last_orphan; /* start of list of inodes to delete */ 888 __le32 s_hash_seed[4]; /* HTREE hash seed */ 889 __u8 s_def_hash_version; /* Default hash version to use */ 890 __u8 s_reserved_char_pad; 891 __le16 s_desc_size; /* size of group descriptor */ 892 /*100*/ __le32 s_default_mount_opts; 893 __le32 s_first_meta_bg; /* First metablock block group */ 894 __le32 s_mkfs_time; /* When the filesystem was created */ 895 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 896 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 897 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 898 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 899 __le32 s_free_blocks_count_hi; /* Free blocks count */ 900 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 901 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 902 __le32 s_flags; /* Miscellaneous flags */ 903 __le16 s_raid_stride; /* RAID stride */ 904 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 905 __le64 s_mmp_block; /* Block for multi-mount protection */ 906 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 907 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 908 __u8 s_reserved_char_pad2; 909 __le16 s_reserved_pad; 910 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 911 __u32 s_reserved[160]; /* Padding to the end of the block */ 912 }; 913 914 #ifdef __KERNEL__ 915 916 /* 917 * run-time mount flags 918 */ 919 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 920 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 921 922 /* 923 * fourth extended-fs super-block data in memory 924 */ 925 struct ext4_sb_info { 926 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 927 unsigned long s_inodes_per_block;/* Number of inodes per block */ 928 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 929 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 930 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 931 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 932 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 933 ext4_group_t s_groups_count; /* Number of groups in the fs */ 934 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 935 unsigned long s_overhead_last; /* Last calculated overhead */ 936 unsigned long s_blocks_last; /* Last seen block count */ 937 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 938 struct buffer_head * s_sbh; /* Buffer containing the super block */ 939 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 940 struct buffer_head **s_group_desc; 941 unsigned int s_mount_opt; 942 unsigned int s_mount_flags; 943 ext4_fsblk_t s_sb_block; 944 uid_t s_resuid; 945 gid_t s_resgid; 946 unsigned short s_mount_state; 947 unsigned short s_pad; 948 int s_addr_per_block_bits; 949 int s_desc_per_block_bits; 950 int s_inode_size; 951 int s_first_ino; 952 unsigned int s_inode_readahead_blks; 953 unsigned int s_inode_goal; 954 spinlock_t s_next_gen_lock; 955 u32 s_next_generation; 956 u32 s_hash_seed[4]; 957 int s_def_hash_version; 958 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 959 struct percpu_counter s_freeblocks_counter; 960 struct percpu_counter s_freeinodes_counter; 961 struct percpu_counter s_dirs_counter; 962 struct percpu_counter s_dirtyblocks_counter; 963 struct blockgroup_lock *s_blockgroup_lock; 964 struct proc_dir_entry *s_proc; 965 struct kobject s_kobj; 966 struct completion s_kobj_unregister; 967 968 /* Journaling */ 969 struct inode *s_journal_inode; 970 struct journal_s *s_journal; 971 struct list_head s_orphan; 972 struct mutex s_orphan_lock; 973 struct mutex s_resize_lock; 974 unsigned long s_commit_interval; 975 u32 s_max_batch_time; 976 u32 s_min_batch_time; 977 struct block_device *journal_bdev; 978 #ifdef CONFIG_JBD2_DEBUG 979 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 980 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 981 #endif 982 #ifdef CONFIG_QUOTA 983 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 984 int s_jquota_fmt; /* Format of quota to use */ 985 #endif 986 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 987 struct rb_root system_blks; 988 989 #ifdef EXTENTS_STATS 990 /* ext4 extents stats */ 991 unsigned long s_ext_min; 992 unsigned long s_ext_max; 993 unsigned long s_depth_max; 994 spinlock_t s_ext_stats_lock; 995 unsigned long s_ext_blocks; 996 unsigned long s_ext_extents; 997 #endif 998 999 /* for buddy allocator */ 1000 struct ext4_group_info ***s_group_info; 1001 struct inode *s_buddy_cache; 1002 long s_blocks_reserved; 1003 spinlock_t s_reserve_lock; 1004 spinlock_t s_md_lock; 1005 tid_t s_last_transaction; 1006 unsigned short *s_mb_offsets; 1007 unsigned int *s_mb_maxs; 1008 1009 /* tunables */ 1010 unsigned long s_stripe; 1011 unsigned int s_mb_stream_request; 1012 unsigned int s_mb_max_to_scan; 1013 unsigned int s_mb_min_to_scan; 1014 unsigned int s_mb_stats; 1015 unsigned int s_mb_order2_reqs; 1016 unsigned int s_mb_group_prealloc; 1017 unsigned int s_max_writeback_mb_bump; 1018 /* where last allocation was done - for stream allocation */ 1019 unsigned long s_mb_last_group; 1020 unsigned long s_mb_last_start; 1021 1022 /* stats for buddy allocator */ 1023 spinlock_t s_mb_pa_lock; 1024 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1025 atomic_t s_bal_success; /* we found long enough chunks */ 1026 atomic_t s_bal_allocated; /* in blocks */ 1027 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1028 atomic_t s_bal_goals; /* goal hits */ 1029 atomic_t s_bal_breaks; /* too long searches */ 1030 atomic_t s_bal_2orders; /* 2^order hits */ 1031 spinlock_t s_bal_lock; 1032 unsigned long s_mb_buddies_generated; 1033 unsigned long long s_mb_generation_time; 1034 atomic_t s_mb_lost_chunks; 1035 atomic_t s_mb_preallocated; 1036 atomic_t s_mb_discarded; 1037 atomic_t s_lock_busy; 1038 1039 /* locality groups */ 1040 struct ext4_locality_group __percpu *s_locality_groups; 1041 1042 /* for write statistics */ 1043 unsigned long s_sectors_written_start; 1044 u64 s_kbytes_written; 1045 1046 unsigned int s_log_groups_per_flex; 1047 struct flex_groups *s_flex_groups; 1048 1049 /* workqueue for dio unwritten */ 1050 struct workqueue_struct *dio_unwritten_wq; 1051 }; 1052 1053 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1054 { 1055 return sb->s_fs_info; 1056 } 1057 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1058 { 1059 return container_of(inode, struct ext4_inode_info, vfs_inode); 1060 } 1061 1062 static inline struct timespec ext4_current_time(struct inode *inode) 1063 { 1064 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1065 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1066 } 1067 1068 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1069 { 1070 return ino == EXT4_ROOT_INO || 1071 ino == EXT4_JOURNAL_INO || 1072 ino == EXT4_RESIZE_INO || 1073 (ino >= EXT4_FIRST_INO(sb) && 1074 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1075 } 1076 1077 /* 1078 * Inode dynamic state flags 1079 */ 1080 enum { 1081 EXT4_STATE_JDATA, /* journaled data exists */ 1082 EXT4_STATE_NEW, /* inode is newly created */ 1083 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1084 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1085 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1086 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1087 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1088 }; 1089 1090 static inline int ext4_test_inode_state(struct inode *inode, int bit) 1091 { 1092 return test_bit(bit, &EXT4_I(inode)->i_state_flags); 1093 } 1094 1095 static inline void ext4_set_inode_state(struct inode *inode, int bit) 1096 { 1097 set_bit(bit, &EXT4_I(inode)->i_state_flags); 1098 } 1099 1100 static inline void ext4_clear_inode_state(struct inode *inode, int bit) 1101 { 1102 clear_bit(bit, &EXT4_I(inode)->i_state_flags); 1103 } 1104 #else 1105 /* Assume that user mode programs are passing in an ext4fs superblock, not 1106 * a kernel struct super_block. This will allow us to call the feature-test 1107 * macros from user land. */ 1108 #define EXT4_SB(sb) (sb) 1109 #endif 1110 1111 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1112 1113 /* 1114 * Codes for operating systems 1115 */ 1116 #define EXT4_OS_LINUX 0 1117 #define EXT4_OS_HURD 1 1118 #define EXT4_OS_MASIX 2 1119 #define EXT4_OS_FREEBSD 3 1120 #define EXT4_OS_LITES 4 1121 1122 /* 1123 * Revision levels 1124 */ 1125 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1126 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1127 1128 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1129 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1130 1131 #define EXT4_GOOD_OLD_INODE_SIZE 128 1132 1133 /* 1134 * Feature set definitions 1135 */ 1136 1137 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1138 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1139 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1140 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1141 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1142 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1143 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1144 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1145 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1146 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1147 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1148 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1149 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1150 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1151 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1152 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1153 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1154 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1155 1156 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1157 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1158 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1159 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1160 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1161 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1162 1163 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1164 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1165 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1166 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1167 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1168 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1169 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1170 1171 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1172 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1173 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1174 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1175 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1176 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1177 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1178 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1179 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1180 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1181 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1182 1183 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1184 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1185 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1186 EXT4_FEATURE_INCOMPAT_META_BG| \ 1187 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1188 EXT4_FEATURE_INCOMPAT_64BIT| \ 1189 EXT4_FEATURE_INCOMPAT_FLEX_BG) 1190 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1191 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1192 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1193 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1194 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1195 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1196 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1197 1198 /* 1199 * Default values for user and/or group using reserved blocks 1200 */ 1201 #define EXT4_DEF_RESUID 0 1202 #define EXT4_DEF_RESGID 0 1203 1204 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1205 1206 /* 1207 * Default mount options 1208 */ 1209 #define EXT4_DEFM_DEBUG 0x0001 1210 #define EXT4_DEFM_BSDGROUPS 0x0002 1211 #define EXT4_DEFM_XATTR_USER 0x0004 1212 #define EXT4_DEFM_ACL 0x0008 1213 #define EXT4_DEFM_UID16 0x0010 1214 #define EXT4_DEFM_JMODE 0x0060 1215 #define EXT4_DEFM_JMODE_DATA 0x0020 1216 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1217 #define EXT4_DEFM_JMODE_WBACK 0x0060 1218 1219 /* 1220 * Default journal batch times 1221 */ 1222 #define EXT4_DEF_MIN_BATCH_TIME 0 1223 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1224 1225 /* 1226 * Minimum number of groups in a flexgroup before we separate out 1227 * directories into the first block group of a flexgroup 1228 */ 1229 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1230 1231 /* 1232 * Structure of a directory entry 1233 */ 1234 #define EXT4_NAME_LEN 255 1235 1236 struct ext4_dir_entry { 1237 __le32 inode; /* Inode number */ 1238 __le16 rec_len; /* Directory entry length */ 1239 __le16 name_len; /* Name length */ 1240 char name[EXT4_NAME_LEN]; /* File name */ 1241 }; 1242 1243 /* 1244 * The new version of the directory entry. Since EXT4 structures are 1245 * stored in intel byte order, and the name_len field could never be 1246 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1247 * file_type field. 1248 */ 1249 struct ext4_dir_entry_2 { 1250 __le32 inode; /* Inode number */ 1251 __le16 rec_len; /* Directory entry length */ 1252 __u8 name_len; /* Name length */ 1253 __u8 file_type; 1254 char name[EXT4_NAME_LEN]; /* File name */ 1255 }; 1256 1257 /* 1258 * Ext4 directory file types. Only the low 3 bits are used. The 1259 * other bits are reserved for now. 1260 */ 1261 #define EXT4_FT_UNKNOWN 0 1262 #define EXT4_FT_REG_FILE 1 1263 #define EXT4_FT_DIR 2 1264 #define EXT4_FT_CHRDEV 3 1265 #define EXT4_FT_BLKDEV 4 1266 #define EXT4_FT_FIFO 5 1267 #define EXT4_FT_SOCK 6 1268 #define EXT4_FT_SYMLINK 7 1269 1270 #define EXT4_FT_MAX 8 1271 1272 /* 1273 * EXT4_DIR_PAD defines the directory entries boundaries 1274 * 1275 * NOTE: It must be a multiple of 4 1276 */ 1277 #define EXT4_DIR_PAD 4 1278 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1279 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1280 ~EXT4_DIR_ROUND) 1281 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1282 1283 /* 1284 * Hash Tree Directory indexing 1285 * (c) Daniel Phillips, 2001 1286 */ 1287 1288 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1289 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1290 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 1291 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1292 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1293 1294 /* Legal values for the dx_root hash_version field: */ 1295 1296 #define DX_HASH_LEGACY 0 1297 #define DX_HASH_HALF_MD4 1 1298 #define DX_HASH_TEA 2 1299 #define DX_HASH_LEGACY_UNSIGNED 3 1300 #define DX_HASH_HALF_MD4_UNSIGNED 4 1301 #define DX_HASH_TEA_UNSIGNED 5 1302 1303 #ifdef __KERNEL__ 1304 1305 /* hash info structure used by the directory hash */ 1306 struct dx_hash_info 1307 { 1308 u32 hash; 1309 u32 minor_hash; 1310 int hash_version; 1311 u32 *seed; 1312 }; 1313 1314 #define EXT4_HTREE_EOF 0x7fffffff 1315 1316 /* 1317 * Control parameters used by ext4_htree_next_block 1318 */ 1319 #define HASH_NB_ALWAYS 1 1320 1321 1322 /* 1323 * Describe an inode's exact location on disk and in memory 1324 */ 1325 struct ext4_iloc 1326 { 1327 struct buffer_head *bh; 1328 unsigned long offset; 1329 ext4_group_t block_group; 1330 }; 1331 1332 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1333 { 1334 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1335 } 1336 1337 /* 1338 * This structure is stuffed into the struct file's private_data field 1339 * for directories. It is where we put information so that we can do 1340 * readdir operations in hash tree order. 1341 */ 1342 struct dir_private_info { 1343 struct rb_root root; 1344 struct rb_node *curr_node; 1345 struct fname *extra_fname; 1346 loff_t last_pos; 1347 __u32 curr_hash; 1348 __u32 curr_minor_hash; 1349 __u32 next_hash; 1350 }; 1351 1352 /* calculate the first block number of the group */ 1353 static inline ext4_fsblk_t 1354 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1355 { 1356 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1357 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1358 } 1359 1360 /* 1361 * Special error return code only used by dx_probe() and its callers. 1362 */ 1363 #define ERR_BAD_DX_DIR -75000 1364 1365 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1366 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1367 1368 extern struct proc_dir_entry *ext4_proc_root; 1369 1370 /* 1371 * Function prototypes 1372 */ 1373 1374 /* 1375 * Ok, these declarations are also in <linux/kernel.h> but none of the 1376 * ext4 source programs needs to include it so they are duplicated here. 1377 */ 1378 # define NORET_TYPE /**/ 1379 # define ATTRIB_NORET __attribute__((noreturn)) 1380 # define NORET_AND noreturn, 1381 1382 /* bitmap.c */ 1383 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1384 1385 /* balloc.c */ 1386 extern unsigned int ext4_block_group(struct super_block *sb, 1387 ext4_fsblk_t blocknr); 1388 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1389 ext4_fsblk_t blocknr); 1390 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1391 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1392 ext4_group_t group); 1393 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1394 ext4_fsblk_t goal, unsigned long *count, int *errp); 1395 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1396 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1397 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1398 ext4_fsblk_t block, unsigned long count); 1399 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1400 extern void ext4_check_blocks_bitmap(struct super_block *); 1401 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1402 ext4_group_t block_group, 1403 struct buffer_head ** bh); 1404 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1405 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1406 ext4_group_t block_group); 1407 extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1408 struct buffer_head *bh, 1409 ext4_group_t group, 1410 struct ext4_group_desc *desc); 1411 #define ext4_free_blocks_after_init(sb, group, desc) \ 1412 ext4_init_block_bitmap(sb, NULL, group, desc) 1413 1414 /* dir.c */ 1415 extern int ext4_check_dir_entry(const char *, struct inode *, 1416 struct ext4_dir_entry_2 *, 1417 struct buffer_head *, unsigned int); 1418 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1419 __u32 minor_hash, 1420 struct ext4_dir_entry_2 *dirent); 1421 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1422 1423 /* fsync.c */ 1424 extern int ext4_sync_file(struct file *, struct dentry *, int); 1425 1426 /* hash.c */ 1427 extern int ext4fs_dirhash(const char *name, int len, struct 1428 dx_hash_info *hinfo); 1429 1430 /* ialloc.c */ 1431 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 1432 const struct qstr *qstr, __u32 goal); 1433 extern void ext4_free_inode(handle_t *, struct inode *); 1434 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1435 extern unsigned long ext4_count_free_inodes(struct super_block *); 1436 extern unsigned long ext4_count_dirs(struct super_block *); 1437 extern void ext4_check_inodes_bitmap(struct super_block *); 1438 extern unsigned ext4_init_inode_bitmap(struct super_block *sb, 1439 struct buffer_head *bh, 1440 ext4_group_t group, 1441 struct ext4_group_desc *desc); 1442 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1443 1444 /* mballoc.c */ 1445 extern long ext4_mb_stats; 1446 extern long ext4_mb_max_to_scan; 1447 extern int ext4_mb_init(struct super_block *, int); 1448 extern int ext4_mb_release(struct super_block *); 1449 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1450 struct ext4_allocation_request *, int *); 1451 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1452 extern void ext4_discard_preallocations(struct inode *); 1453 extern int __init init_ext4_mballoc(void); 1454 extern void exit_ext4_mballoc(void); 1455 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1456 struct buffer_head *bh, ext4_fsblk_t block, 1457 unsigned long count, int flags); 1458 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1459 ext4_group_t i, struct ext4_group_desc *desc); 1460 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1461 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1462 ext4_group_t, int); 1463 /* inode.c */ 1464 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1465 ext4_lblk_t, int, int *); 1466 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1467 ext4_lblk_t, int, int *); 1468 int ext4_get_block(struct inode *inode, sector_t iblock, 1469 struct buffer_head *bh_result, int create); 1470 1471 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1472 extern int ext4_write_inode(struct inode *, struct writeback_control *); 1473 extern int ext4_setattr(struct dentry *, struct iattr *); 1474 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1475 struct kstat *stat); 1476 extern void ext4_delete_inode(struct inode *); 1477 extern int ext4_sync_inode(handle_t *, struct inode *); 1478 extern void ext4_dirty_inode(struct inode *); 1479 extern int ext4_change_inode_journal_flag(struct inode *, int); 1480 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1481 extern int ext4_can_truncate(struct inode *inode); 1482 extern void ext4_truncate(struct inode *); 1483 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1484 extern void ext4_set_inode_flags(struct inode *); 1485 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1486 extern int ext4_alloc_da_blocks(struct inode *inode); 1487 extern void ext4_set_aops(struct inode *inode); 1488 extern int ext4_writepage_trans_blocks(struct inode *); 1489 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1490 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1491 extern int ext4_block_truncate_page(handle_t *handle, 1492 struct address_space *mapping, loff_t from); 1493 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1494 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 1495 extern int flush_completed_IO(struct inode *inode); 1496 extern void ext4_da_update_reserve_space(struct inode *inode, 1497 int used, int quota_claim); 1498 /* ioctl.c */ 1499 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1500 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1501 1502 /* migrate.c */ 1503 extern int ext4_ext_migrate(struct inode *); 1504 1505 /* namei.c */ 1506 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 1507 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 1508 extern int ext4_orphan_add(handle_t *, struct inode *); 1509 extern int ext4_orphan_del(handle_t *, struct inode *); 1510 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1511 __u32 start_minor_hash, __u32 *next_hash); 1512 1513 /* resize.c */ 1514 extern int ext4_group_add(struct super_block *sb, 1515 struct ext4_new_group_data *input); 1516 extern int ext4_group_extend(struct super_block *sb, 1517 struct ext4_super_block *es, 1518 ext4_fsblk_t n_blocks_count); 1519 1520 /* super.c */ 1521 extern void __ext4_error(struct super_block *, const char *, const char *, ...) 1522 __attribute__ ((format (printf, 3, 4))); 1523 #define ext4_error(sb, message...) __ext4_error(sb, __func__, ## message) 1524 extern void ext4_error_inode(const char *, struct inode *, const char *, ...) 1525 __attribute__ ((format (printf, 3, 4))); 1526 extern void ext4_error_file(const char *, struct file *, const char *, ...) 1527 __attribute__ ((format (printf, 3, 4))); 1528 extern void __ext4_std_error(struct super_block *, const char *, int); 1529 extern void ext4_abort(struct super_block *, const char *, const char *, ...) 1530 __attribute__ ((format (printf, 3, 4))); 1531 extern void __ext4_warning(struct super_block *, const char *, 1532 const char *, ...) 1533 __attribute__ ((format (printf, 3, 4))); 1534 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, ## message) 1535 extern void ext4_msg(struct super_block *, const char *, const char *, ...) 1536 __attribute__ ((format (printf, 3, 4))); 1537 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 1538 const char *, const char *, ...) 1539 __attribute__ ((format (printf, 4, 5))); 1540 extern void ext4_update_dynamic_rev(struct super_block *sb); 1541 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1542 __u32 compat); 1543 extern int ext4_update_rocompat_feature(handle_t *handle, 1544 struct super_block *sb, __u32 rocompat); 1545 extern int ext4_update_incompat_feature(handle_t *handle, 1546 struct super_block *sb, __u32 incompat); 1547 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1548 struct ext4_group_desc *bg); 1549 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1550 struct ext4_group_desc *bg); 1551 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1552 struct ext4_group_desc *bg); 1553 extern __u32 ext4_free_blks_count(struct super_block *sb, 1554 struct ext4_group_desc *bg); 1555 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1556 struct ext4_group_desc *bg); 1557 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1558 struct ext4_group_desc *bg); 1559 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1560 struct ext4_group_desc *bg); 1561 extern void ext4_block_bitmap_set(struct super_block *sb, 1562 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1563 extern void ext4_inode_bitmap_set(struct super_block *sb, 1564 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1565 extern void ext4_inode_table_set(struct super_block *sb, 1566 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1567 extern void ext4_free_blks_set(struct super_block *sb, 1568 struct ext4_group_desc *bg, __u32 count); 1569 extern void ext4_free_inodes_set(struct super_block *sb, 1570 struct ext4_group_desc *bg, __u32 count); 1571 extern void ext4_used_dirs_set(struct super_block *sb, 1572 struct ext4_group_desc *bg, __u32 count); 1573 extern void ext4_itable_unused_set(struct super_block *sb, 1574 struct ext4_group_desc *bg, __u32 count); 1575 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1576 struct ext4_group_desc *gdp); 1577 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1578 struct ext4_group_desc *gdp); 1579 1580 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1581 { 1582 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1583 le32_to_cpu(es->s_blocks_count_lo); 1584 } 1585 1586 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1587 { 1588 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1589 le32_to_cpu(es->s_r_blocks_count_lo); 1590 } 1591 1592 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1593 { 1594 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1595 le32_to_cpu(es->s_free_blocks_count_lo); 1596 } 1597 1598 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1599 ext4_fsblk_t blk) 1600 { 1601 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1602 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1603 } 1604 1605 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1606 ext4_fsblk_t blk) 1607 { 1608 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1609 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1610 } 1611 1612 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1613 ext4_fsblk_t blk) 1614 { 1615 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1616 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1617 } 1618 1619 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1620 { 1621 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1622 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1623 le32_to_cpu(raw_inode->i_size_lo); 1624 else 1625 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1626 } 1627 1628 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1629 { 1630 raw_inode->i_size_lo = cpu_to_le32(i_size); 1631 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1632 } 1633 1634 static inline 1635 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1636 ext4_group_t group) 1637 { 1638 struct ext4_group_info ***grp_info; 1639 long indexv, indexh; 1640 grp_info = EXT4_SB(sb)->s_group_info; 1641 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1642 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1643 return grp_info[indexv][indexh]; 1644 } 1645 1646 /* 1647 * Reading s_groups_count requires using smp_rmb() afterwards. See 1648 * the locking protocol documented in the comments of ext4_group_add() 1649 * in resize.c 1650 */ 1651 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1652 { 1653 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1654 1655 smp_rmb(); 1656 return ngroups; 1657 } 1658 1659 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1660 ext4_group_t block_group) 1661 { 1662 return block_group >> sbi->s_log_groups_per_flex; 1663 } 1664 1665 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1666 { 1667 return 1 << sbi->s_log_groups_per_flex; 1668 } 1669 1670 #define ext4_std_error(sb, errno) \ 1671 do { \ 1672 if ((errno)) \ 1673 __ext4_std_error((sb), __func__, (errno)); \ 1674 } while (0) 1675 1676 #ifdef CONFIG_SMP 1677 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1678 * counters. So we need to make sure we have free blocks more 1679 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1680 */ 1681 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1682 #else 1683 #define EXT4_FREEBLOCKS_WATERMARK 0 1684 #endif 1685 1686 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1687 { 1688 /* 1689 * XXX: replace with spinlock if seen contended -bzzz 1690 */ 1691 down_write(&EXT4_I(inode)->i_data_sem); 1692 if (newsize > EXT4_I(inode)->i_disksize) 1693 EXT4_I(inode)->i_disksize = newsize; 1694 up_write(&EXT4_I(inode)->i_data_sem); 1695 return ; 1696 } 1697 1698 struct ext4_group_info { 1699 unsigned long bb_state; 1700 struct rb_root bb_free_root; 1701 ext4_grpblk_t bb_first_free; /* first free block */ 1702 ext4_grpblk_t bb_free; /* total free blocks */ 1703 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 1704 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 1705 struct list_head bb_prealloc_list; 1706 #ifdef DOUBLE_CHECK 1707 void *bb_bitmap; 1708 #endif 1709 struct rw_semaphore alloc_sem; 1710 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 1711 * regions, index is order. 1712 * bb_counters[3] = 5 means 1713 * 5 free 8-block regions. */ 1714 }; 1715 1716 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1717 1718 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1719 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1720 1721 #define EXT4_MAX_CONTENTION 8 1722 #define EXT4_CONTENTION_THRESHOLD 2 1723 1724 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 1725 ext4_group_t group) 1726 { 1727 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 1728 } 1729 1730 /* 1731 * Returns true if the filesystem is busy enough that attempts to 1732 * access the block group locks has run into contention. 1733 */ 1734 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 1735 { 1736 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 1737 } 1738 1739 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1740 { 1741 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 1742 if (spin_trylock(lock)) 1743 /* 1744 * We're able to grab the lock right away, so drop the 1745 * lock contention counter. 1746 */ 1747 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 1748 else { 1749 /* 1750 * The lock is busy, so bump the contention counter, 1751 * and then wait on the spin lock. 1752 */ 1753 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 1754 EXT4_MAX_CONTENTION); 1755 spin_lock(lock); 1756 } 1757 } 1758 1759 static inline void ext4_unlock_group(struct super_block *sb, 1760 ext4_group_t group) 1761 { 1762 spin_unlock(ext4_group_lock_ptr(sb, group)); 1763 } 1764 1765 /* 1766 * Inodes and files operations 1767 */ 1768 1769 /* dir.c */ 1770 extern const struct file_operations ext4_dir_operations; 1771 1772 /* file.c */ 1773 extern const struct inode_operations ext4_file_inode_operations; 1774 extern const struct file_operations ext4_file_operations; 1775 1776 /* namei.c */ 1777 extern const struct inode_operations ext4_dir_inode_operations; 1778 extern const struct inode_operations ext4_special_inode_operations; 1779 extern struct dentry *ext4_get_parent(struct dentry *child); 1780 1781 /* symlink.c */ 1782 extern const struct inode_operations ext4_symlink_inode_operations; 1783 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1784 1785 /* block_validity */ 1786 extern void ext4_release_system_zone(struct super_block *sb); 1787 extern int ext4_setup_system_zone(struct super_block *sb); 1788 extern int __init init_ext4_system_zone(void); 1789 extern void exit_ext4_system_zone(void); 1790 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 1791 ext4_fsblk_t start_blk, 1792 unsigned int count); 1793 1794 /* extents.c */ 1795 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1796 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1797 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1798 int chunk); 1799 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 1800 struct ext4_map_blocks *map, int flags); 1801 extern void ext4_ext_truncate(struct inode *); 1802 extern void ext4_ext_init(struct super_block *); 1803 extern void ext4_ext_release(struct super_block *); 1804 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1805 loff_t len); 1806 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 1807 ssize_t len); 1808 extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 1809 struct ext4_map_blocks *map, int flags); 1810 extern int ext4_get_blocks(handle_t *handle, struct inode *inode, 1811 sector_t block, unsigned int max_blocks, 1812 struct buffer_head *bh, int flags); 1813 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1814 __u64 start, __u64 len); 1815 /* move_extent.c */ 1816 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 1817 __u64 start_orig, __u64 start_donor, 1818 __u64 len, __u64 *moved_len); 1819 1820 1821 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 1822 enum ext4_state_bits { 1823 BH_Uninit /* blocks are allocated but uninitialized on disk */ 1824 = BH_JBDPrivateStart, 1825 }; 1826 1827 BUFFER_FNS(Uninit, uninit) 1828 TAS_BUFFER_FNS(Uninit, uninit) 1829 1830 /* 1831 * Add new method to test wether block and inode bitmaps are properly 1832 * initialized. With uninit_bg reading the block from disk is not enough 1833 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1834 */ 1835 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1836 1837 static inline int bitmap_uptodate(struct buffer_head *bh) 1838 { 1839 return (buffer_uptodate(bh) && 1840 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1841 } 1842 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1843 { 1844 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1845 } 1846 1847 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 1848 1849 #endif /* __KERNEL__ */ 1850 1851 #endif /* _EXT4_H */ 1852