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 * Flags used in mballoc's allocation_context flags field. 70 * 71 * Also used to show what's going on for debugging purposes when the 72 * flag field is exported via the traceport interface 73 */ 74 75 /* prefer goal again. length */ 76 #define EXT4_MB_HINT_MERGE 0x0001 77 /* blocks already reserved */ 78 #define EXT4_MB_HINT_RESERVED 0x0002 79 /* metadata is being allocated */ 80 #define EXT4_MB_HINT_METADATA 0x0004 81 /* first blocks in the file */ 82 #define EXT4_MB_HINT_FIRST 0x0008 83 /* search for the best chunk */ 84 #define EXT4_MB_HINT_BEST 0x0010 85 /* data is being allocated */ 86 #define EXT4_MB_HINT_DATA 0x0020 87 /* don't preallocate (for tails) */ 88 #define EXT4_MB_HINT_NOPREALLOC 0x0040 89 /* allocate for locality group */ 90 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080 91 /* allocate goal blocks or none */ 92 #define EXT4_MB_HINT_GOAL_ONLY 0x0100 93 /* goal is meaningful */ 94 #define EXT4_MB_HINT_TRY_GOAL 0x0200 95 /* blocks already pre-reserved by delayed allocation */ 96 #define EXT4_MB_DELALLOC_RESERVED 0x0400 97 /* We are doing stream allocation */ 98 #define EXT4_MB_STREAM_ALLOC 0x0800 99 100 101 struct ext4_allocation_request { 102 /* target inode for block we're allocating */ 103 struct inode *inode; 104 /* how many blocks we want to allocate */ 105 unsigned int len; 106 /* logical block in target inode */ 107 ext4_lblk_t logical; 108 /* the closest logical allocated block to the left */ 109 ext4_lblk_t lleft; 110 /* the closest logical allocated block to the right */ 111 ext4_lblk_t lright; 112 /* phys. target (a hint) */ 113 ext4_fsblk_t goal; 114 /* phys. block for the closest logical allocated block to the left */ 115 ext4_fsblk_t pleft; 116 /* phys. block for the closest logical allocated block to the right */ 117 ext4_fsblk_t pright; 118 /* flags. see above EXT4_MB_HINT_* */ 119 unsigned int flags; 120 }; 121 122 /* 123 * For delayed allocation tracking 124 */ 125 struct mpage_da_data { 126 struct inode *inode; 127 sector_t b_blocknr; /* start block number of extent */ 128 size_t b_size; /* size of extent */ 129 unsigned long b_state; /* state of the extent */ 130 unsigned long first_page, next_page; /* extent of pages */ 131 struct writeback_control *wbc; 132 int io_done; 133 int pages_written; 134 int retval; 135 }; 136 #define DIO_AIO_UNWRITTEN 0x1 137 typedef struct ext4_io_end { 138 struct list_head list; /* per-file finished AIO list */ 139 struct inode *inode; /* file being written to */ 140 unsigned int flag; /* unwritten or not */ 141 int error; /* I/O error code */ 142 ext4_lblk_t offset; /* offset in the file */ 143 size_t size; /* size of the extent */ 144 struct work_struct work; /* data work queue */ 145 } ext4_io_end_t; 146 147 /* 148 * Special inodes numbers 149 */ 150 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 151 #define EXT4_ROOT_INO 2 /* Root inode */ 152 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 153 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 154 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 155 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 156 157 /* First non-reserved inode for old ext4 filesystems */ 158 #define EXT4_GOOD_OLD_FIRST_INO 11 159 160 /* 161 * Maximal count of links to a file 162 */ 163 #define EXT4_LINK_MAX 65000 164 165 /* 166 * Macro-instructions used to manage several block sizes 167 */ 168 #define EXT4_MIN_BLOCK_SIZE 1024 169 #define EXT4_MAX_BLOCK_SIZE 65536 170 #define EXT4_MIN_BLOCK_LOG_SIZE 10 171 #ifdef __KERNEL__ 172 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 173 #else 174 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 175 #endif 176 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 177 #ifdef __KERNEL__ 178 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 179 #else 180 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 181 #endif 182 #ifdef __KERNEL__ 183 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 184 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 185 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 186 #else 187 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 188 EXT4_GOOD_OLD_INODE_SIZE : \ 189 (s)->s_inode_size) 190 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 191 EXT4_GOOD_OLD_FIRST_INO : \ 192 (s)->s_first_ino) 193 #endif 194 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 195 196 /* 197 * Structure of a blocks group descriptor 198 */ 199 struct ext4_group_desc 200 { 201 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 202 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 203 __le32 bg_inode_table_lo; /* Inodes table block */ 204 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 205 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 206 __le16 bg_used_dirs_count_lo; /* Directories count */ 207 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 208 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 209 __le16 bg_itable_unused_lo; /* Unused inodes count */ 210 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 211 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 212 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 213 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 214 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 215 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 216 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 217 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 218 __u32 bg_reserved2[3]; 219 }; 220 221 /* 222 * Structure of a flex block group info 223 */ 224 225 struct flex_groups { 226 atomic_t free_inodes; 227 atomic_t free_blocks; 228 atomic_t used_dirs; 229 }; 230 231 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 232 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 233 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 234 235 /* 236 * Macro-instructions used to manage group descriptors 237 */ 238 #define EXT4_MIN_DESC_SIZE 32 239 #define EXT4_MIN_DESC_SIZE_64BIT 64 240 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 241 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 242 #ifdef __KERNEL__ 243 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 244 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 245 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 246 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 247 #else 248 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 249 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 250 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 251 #endif 252 253 /* 254 * Constants relative to the data blocks 255 */ 256 #define EXT4_NDIR_BLOCKS 12 257 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 258 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 259 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 260 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 261 262 /* 263 * Inode flags 264 */ 265 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 266 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 267 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 268 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 269 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 270 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 271 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 272 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 273 /* Reserved for compression usage... */ 274 #define EXT4_DIRTY_FL 0x00000100 275 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 276 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 277 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 278 /* End compression flags --- maybe not all used */ 279 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 280 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 281 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 282 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 283 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 284 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 285 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 286 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 287 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 288 289 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 290 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ 291 292 /* Flags that should be inherited by new inodes from their parent. */ 293 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 294 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 295 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 296 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 297 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 298 299 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 300 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 301 302 /* Flags that are appropriate for non-directories/regular files. */ 303 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 304 305 /* Mask out flags that are inappropriate for the given type of inode. */ 306 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 307 { 308 if (S_ISDIR(mode)) 309 return flags; 310 else if (S_ISREG(mode)) 311 return flags & EXT4_REG_FLMASK; 312 else 313 return flags & EXT4_OTHER_FLMASK; 314 } 315 316 /* 317 * Inode dynamic state flags 318 */ 319 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 320 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 321 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 322 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 323 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ 324 #define EXT4_STATE_EXT_MIGRATE 0x00000020 /* Inode is migrating */ 325 #define EXT4_STATE_DIO_UNWRITTEN 0x00000040 /* need convert on dio done*/ 326 327 /* Used to pass group descriptor data when online resize is done */ 328 struct ext4_new_group_input { 329 __u32 group; /* Group number for this data */ 330 __u64 block_bitmap; /* Absolute block number of block bitmap */ 331 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 332 __u64 inode_table; /* Absolute block number of inode table start */ 333 __u32 blocks_count; /* Total number of blocks in this group */ 334 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 335 __u16 unused; 336 }; 337 338 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 339 struct ext4_new_group_data { 340 __u32 group; 341 __u64 block_bitmap; 342 __u64 inode_bitmap; 343 __u64 inode_table; 344 __u32 blocks_count; 345 __u16 reserved_blocks; 346 __u16 unused; 347 __u32 free_blocks_count; 348 }; 349 350 /* 351 * Flags used by ext4_get_blocks() 352 */ 353 /* Allocate any needed blocks and/or convert an unitialized 354 extent to be an initialized ext4 */ 355 #define EXT4_GET_BLOCKS_CREATE 0x0001 356 /* Request the creation of an unitialized extent */ 357 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 358 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 359 EXT4_GET_BLOCKS_CREATE) 360 /* Caller is from the delayed allocation writeout path, 361 so set the magic i_delalloc_reserve_flag after taking the 362 inode allocation semaphore for */ 363 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 364 /* Call ext4_da_update_reserve_space() after successfully 365 allocating the blocks */ 366 #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008 367 /* caller is from the direct IO path, request to creation of an 368 unitialized extents if not allocated, split the uninitialized 369 extent if blocks has been preallocated already*/ 370 #define EXT4_GET_BLOCKS_DIO 0x0010 371 #define EXT4_GET_BLOCKS_CONVERT 0x0020 372 #define EXT4_GET_BLOCKS_DIO_CREATE_EXT (EXT4_GET_BLOCKS_DIO|\ 373 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 374 /* Convert extent to initialized after direct IO complete */ 375 #define EXT4_GET_BLOCKS_DIO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 376 EXT4_GET_BLOCKS_DIO_CREATE_EXT) 377 378 /* 379 * ioctl commands 380 */ 381 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 382 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 383 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 384 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 385 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 386 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 387 #ifdef CONFIG_JBD2_DEBUG 388 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 389 #endif 390 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 391 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 392 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 393 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 394 #define EXT4_IOC_MIGRATE _IO('f', 9) 395 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 396 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 397 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 398 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 399 400 /* 401 * ioctl commands in 32 bit emulation 402 */ 403 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 404 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 405 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 406 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 407 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 408 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 409 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 410 #ifdef CONFIG_JBD2_DEBUG 411 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 412 #endif 413 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 414 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 415 416 417 /* 418 * Mount options 419 */ 420 struct ext4_mount_options { 421 unsigned long s_mount_opt; 422 uid_t s_resuid; 423 gid_t s_resgid; 424 unsigned long s_commit_interval; 425 u32 s_min_batch_time, s_max_batch_time; 426 #ifdef CONFIG_QUOTA 427 int s_jquota_fmt; 428 char *s_qf_names[MAXQUOTAS]; 429 #endif 430 }; 431 432 /* Max physical block we can addres w/o extents */ 433 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 434 435 /* 436 * Structure of an inode on the disk 437 */ 438 struct ext4_inode { 439 __le16 i_mode; /* File mode */ 440 __le16 i_uid; /* Low 16 bits of Owner Uid */ 441 __le32 i_size_lo; /* Size in bytes */ 442 __le32 i_atime; /* Access time */ 443 __le32 i_ctime; /* Inode Change time */ 444 __le32 i_mtime; /* Modification time */ 445 __le32 i_dtime; /* Deletion Time */ 446 __le16 i_gid; /* Low 16 bits of Group Id */ 447 __le16 i_links_count; /* Links count */ 448 __le32 i_blocks_lo; /* Blocks count */ 449 __le32 i_flags; /* File flags */ 450 union { 451 struct { 452 __le32 l_i_version; 453 } linux1; 454 struct { 455 __u32 h_i_translator; 456 } hurd1; 457 struct { 458 __u32 m_i_reserved1; 459 } masix1; 460 } osd1; /* OS dependent 1 */ 461 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 462 __le32 i_generation; /* File version (for NFS) */ 463 __le32 i_file_acl_lo; /* File ACL */ 464 __le32 i_size_high; 465 __le32 i_obso_faddr; /* Obsoleted fragment address */ 466 union { 467 struct { 468 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 469 __le16 l_i_file_acl_high; 470 __le16 l_i_uid_high; /* these 2 fields */ 471 __le16 l_i_gid_high; /* were reserved2[0] */ 472 __u32 l_i_reserved2; 473 } linux2; 474 struct { 475 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 476 __u16 h_i_mode_high; 477 __u16 h_i_uid_high; 478 __u16 h_i_gid_high; 479 __u32 h_i_author; 480 } hurd2; 481 struct { 482 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 483 __le16 m_i_file_acl_high; 484 __u32 m_i_reserved2[2]; 485 } masix2; 486 } osd2; /* OS dependent 2 */ 487 __le16 i_extra_isize; 488 __le16 i_pad1; 489 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 490 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 491 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 492 __le32 i_crtime; /* File Creation time */ 493 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 494 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 495 }; 496 497 struct move_extent { 498 __u32 reserved; /* should be zero */ 499 __u32 donor_fd; /* donor file descriptor */ 500 __u64 orig_start; /* logical start offset in block for orig */ 501 __u64 donor_start; /* logical start offset in block for donor */ 502 __u64 len; /* block length to be moved */ 503 __u64 moved_len; /* moved block length */ 504 }; 505 506 #define EXT4_EPOCH_BITS 2 507 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 508 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 509 510 /* 511 * Extended fields will fit into an inode if the filesystem was formatted 512 * with large inodes (-I 256 or larger) and there are not currently any EAs 513 * consuming all of the available space. For new inodes we always reserve 514 * enough space for the kernel's known extended fields, but for inodes 515 * created with an old kernel this might not have been the case. None of 516 * the extended inode fields is critical for correct filesystem operation. 517 * This macro checks if a certain field fits in the inode. Note that 518 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 519 */ 520 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 521 ((offsetof(typeof(*ext4_inode), field) + \ 522 sizeof((ext4_inode)->field)) \ 523 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 524 (einode)->i_extra_isize)) \ 525 526 static inline __le32 ext4_encode_extra_time(struct timespec *time) 527 { 528 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 529 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 530 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 531 } 532 533 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 534 { 535 if (sizeof(time->tv_sec) > 4) 536 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 537 << 32; 538 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 539 } 540 541 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 542 do { \ 543 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 544 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 545 (raw_inode)->xtime ## _extra = \ 546 ext4_encode_extra_time(&(inode)->xtime); \ 547 } while (0) 548 549 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 550 do { \ 551 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 552 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 553 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 554 (raw_inode)->xtime ## _extra = \ 555 ext4_encode_extra_time(&(einode)->xtime); \ 556 } while (0) 557 558 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 559 do { \ 560 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 561 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 562 ext4_decode_extra_time(&(inode)->xtime, \ 563 raw_inode->xtime ## _extra); \ 564 } while (0) 565 566 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 567 do { \ 568 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 569 (einode)->xtime.tv_sec = \ 570 (signed)le32_to_cpu((raw_inode)->xtime); \ 571 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 572 ext4_decode_extra_time(&(einode)->xtime, \ 573 raw_inode->xtime ## _extra); \ 574 } while (0) 575 576 #define i_disk_version osd1.linux1.l_i_version 577 578 #if defined(__KERNEL__) || defined(__linux__) 579 #define i_reserved1 osd1.linux1.l_i_reserved1 580 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 581 #define i_blocks_high osd2.linux2.l_i_blocks_high 582 #define i_uid_low i_uid 583 #define i_gid_low i_gid 584 #define i_uid_high osd2.linux2.l_i_uid_high 585 #define i_gid_high osd2.linux2.l_i_gid_high 586 #define i_reserved2 osd2.linux2.l_i_reserved2 587 588 #elif defined(__GNU__) 589 590 #define i_translator osd1.hurd1.h_i_translator 591 #define i_uid_high osd2.hurd2.h_i_uid_high 592 #define i_gid_high osd2.hurd2.h_i_gid_high 593 #define i_author osd2.hurd2.h_i_author 594 595 #elif defined(__masix__) 596 597 #define i_reserved1 osd1.masix1.m_i_reserved1 598 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 599 #define i_reserved2 osd2.masix2.m_i_reserved2 600 601 #endif /* defined(__KERNEL__) || defined(__linux__) */ 602 603 /* 604 * storage for cached extent 605 */ 606 struct ext4_ext_cache { 607 ext4_fsblk_t ec_start; 608 ext4_lblk_t ec_block; 609 __u32 ec_len; /* must be 32bit to return holes */ 610 __u32 ec_type; 611 }; 612 613 /* 614 * fourth extended file system inode data in memory 615 */ 616 struct ext4_inode_info { 617 __le32 i_data[15]; /* unconverted */ 618 __u32 i_flags; 619 ext4_fsblk_t i_file_acl; 620 __u32 i_dtime; 621 622 /* 623 * i_block_group is the number of the block group which contains 624 * this file's inode. Constant across the lifetime of the inode, 625 * it is ued for making block allocation decisions - we try to 626 * place a file's data blocks near its inode block, and new inodes 627 * near to their parent directory's inode. 628 */ 629 ext4_group_t i_block_group; 630 __u32 i_state; /* Dynamic state flags for ext4 */ 631 632 ext4_lblk_t i_dir_start_lookup; 633 #ifdef CONFIG_EXT4_FS_XATTR 634 /* 635 * Extended attributes can be read independently of the main file 636 * data. Taking i_mutex even when reading would cause contention 637 * between readers of EAs and writers of regular file data, so 638 * instead we synchronize on xattr_sem when reading or changing 639 * EAs. 640 */ 641 struct rw_semaphore xattr_sem; 642 #endif 643 644 struct list_head i_orphan; /* unlinked but open inodes */ 645 646 /* 647 * i_disksize keeps track of what the inode size is ON DISK, not 648 * in memory. During truncate, i_size is set to the new size by 649 * the VFS prior to calling ext4_truncate(), but the filesystem won't 650 * set i_disksize to 0 until the truncate is actually under way. 651 * 652 * The intent is that i_disksize always represents the blocks which 653 * are used by this file. This allows recovery to restart truncate 654 * on orphans if we crash during truncate. We actually write i_disksize 655 * into the on-disk inode when writing inodes out, instead of i_size. 656 * 657 * The only time when i_disksize and i_size may be different is when 658 * a truncate is in progress. The only things which change i_disksize 659 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 660 */ 661 loff_t i_disksize; 662 663 /* 664 * i_data_sem is for serialising ext4_truncate() against 665 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 666 * data tree are chopped off during truncate. We can't do that in 667 * ext4 because whenever we perform intermediate commits during 668 * truncate, the inode and all the metadata blocks *must* be in a 669 * consistent state which allows truncation of the orphans to restart 670 * during recovery. Hence we must fix the get_block-vs-truncate race 671 * by other means, so we have i_data_sem. 672 */ 673 struct rw_semaphore i_data_sem; 674 struct inode vfs_inode; 675 struct jbd2_inode jinode; 676 677 struct ext4_ext_cache i_cached_extent; 678 /* 679 * File creation time. Its function is same as that of 680 * struct timespec i_{a,c,m}time in the generic inode. 681 */ 682 struct timespec i_crtime; 683 684 /* mballoc */ 685 struct list_head i_prealloc_list; 686 spinlock_t i_prealloc_lock; 687 688 /* ialloc */ 689 ext4_group_t i_last_alloc_group; 690 691 /* allocation reservation info for delalloc */ 692 unsigned int i_reserved_data_blocks; 693 unsigned int i_reserved_meta_blocks; 694 unsigned int i_allocated_meta_blocks; 695 unsigned short i_delalloc_reserved_flag; 696 697 /* on-disk additional length */ 698 __u16 i_extra_isize; 699 700 spinlock_t i_block_reservation_lock; 701 702 /* completed async DIOs that might need unwritten extents handling */ 703 struct list_head i_aio_dio_complete_list; 704 /* current io_end structure for async DIO write*/ 705 ext4_io_end_t *cur_aio_dio; 706 }; 707 708 /* 709 * File system states 710 */ 711 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 712 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 713 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 714 715 /* 716 * Misc. filesystem flags 717 */ 718 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 719 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 720 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 721 722 /* 723 * Mount flags 724 */ 725 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 726 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 727 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 728 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 729 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 730 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 731 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 732 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 733 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 734 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 735 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 736 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 737 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 738 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 739 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 740 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 741 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 742 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 743 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 744 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 745 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 746 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 747 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 748 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 749 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 750 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 751 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 752 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 753 754 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 755 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 756 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 757 EXT4_MOUNT_##opt) 758 759 #define ext4_set_bit ext2_set_bit 760 #define ext4_set_bit_atomic ext2_set_bit_atomic 761 #define ext4_clear_bit ext2_clear_bit 762 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 763 #define ext4_test_bit ext2_test_bit 764 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 765 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 766 #define ext4_find_next_bit ext2_find_next_bit 767 768 /* 769 * Maximal mount counts between two filesystem checks 770 */ 771 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 772 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 773 774 /* 775 * Behaviour when detecting errors 776 */ 777 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 778 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 779 #define EXT4_ERRORS_PANIC 3 /* Panic */ 780 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 781 782 /* 783 * Structure of the super block 784 */ 785 struct ext4_super_block { 786 /*00*/ __le32 s_inodes_count; /* Inodes count */ 787 __le32 s_blocks_count_lo; /* Blocks count */ 788 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 789 __le32 s_free_blocks_count_lo; /* Free blocks count */ 790 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 791 __le32 s_first_data_block; /* First Data Block */ 792 __le32 s_log_block_size; /* Block size */ 793 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 794 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 795 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 796 __le32 s_inodes_per_group; /* # Inodes per group */ 797 __le32 s_mtime; /* Mount time */ 798 /*30*/ __le32 s_wtime; /* Write time */ 799 __le16 s_mnt_count; /* Mount count */ 800 __le16 s_max_mnt_count; /* Maximal mount count */ 801 __le16 s_magic; /* Magic signature */ 802 __le16 s_state; /* File system state */ 803 __le16 s_errors; /* Behaviour when detecting errors */ 804 __le16 s_minor_rev_level; /* minor revision level */ 805 /*40*/ __le32 s_lastcheck; /* time of last check */ 806 __le32 s_checkinterval; /* max. time between checks */ 807 __le32 s_creator_os; /* OS */ 808 __le32 s_rev_level; /* Revision level */ 809 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 810 __le16 s_def_resgid; /* Default gid for reserved blocks */ 811 /* 812 * These fields are for EXT4_DYNAMIC_REV superblocks only. 813 * 814 * Note: the difference between the compatible feature set and 815 * the incompatible feature set is that if there is a bit set 816 * in the incompatible feature set that the kernel doesn't 817 * know about, it should refuse to mount the filesystem. 818 * 819 * e2fsck's requirements are more strict; if it doesn't know 820 * about a feature in either the compatible or incompatible 821 * feature set, it must abort and not try to meddle with 822 * things it doesn't understand... 823 */ 824 __le32 s_first_ino; /* First non-reserved inode */ 825 __le16 s_inode_size; /* size of inode structure */ 826 __le16 s_block_group_nr; /* block group # of this superblock */ 827 __le32 s_feature_compat; /* compatible feature set */ 828 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 829 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 830 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 831 /*78*/ char s_volume_name[16]; /* volume name */ 832 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 833 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 834 /* 835 * Performance hints. Directory preallocation should only 836 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 837 */ 838 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 839 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 840 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 841 /* 842 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 843 */ 844 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 845 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 846 __le32 s_journal_dev; /* device number of journal file */ 847 __le32 s_last_orphan; /* start of list of inodes to delete */ 848 __le32 s_hash_seed[4]; /* HTREE hash seed */ 849 __u8 s_def_hash_version; /* Default hash version to use */ 850 __u8 s_reserved_char_pad; 851 __le16 s_desc_size; /* size of group descriptor */ 852 /*100*/ __le32 s_default_mount_opts; 853 __le32 s_first_meta_bg; /* First metablock block group */ 854 __le32 s_mkfs_time; /* When the filesystem was created */ 855 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 856 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 857 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 858 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 859 __le32 s_free_blocks_count_hi; /* Free blocks count */ 860 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 861 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 862 __le32 s_flags; /* Miscellaneous flags */ 863 __le16 s_raid_stride; /* RAID stride */ 864 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 865 __le64 s_mmp_block; /* Block for multi-mount protection */ 866 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 867 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 868 __u8 s_reserved_char_pad2; 869 __le16 s_reserved_pad; 870 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 871 __u32 s_reserved[160]; /* Padding to the end of the block */ 872 }; 873 874 #ifdef __KERNEL__ 875 876 /* 877 * run-time mount flags 878 */ 879 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 880 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 881 882 /* 883 * fourth extended-fs super-block data in memory 884 */ 885 struct ext4_sb_info { 886 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 887 unsigned long s_inodes_per_block;/* Number of inodes per block */ 888 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 889 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 890 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 891 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 892 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 893 ext4_group_t s_groups_count; /* Number of groups in the fs */ 894 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 895 unsigned long s_overhead_last; /* Last calculated overhead */ 896 unsigned long s_blocks_last; /* Last seen block count */ 897 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 898 struct buffer_head * s_sbh; /* Buffer containing the super block */ 899 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 900 struct buffer_head **s_group_desc; 901 unsigned int s_mount_opt; 902 unsigned int s_mount_flags; 903 ext4_fsblk_t s_sb_block; 904 uid_t s_resuid; 905 gid_t s_resgid; 906 unsigned short s_mount_state; 907 unsigned short s_pad; 908 int s_addr_per_block_bits; 909 int s_desc_per_block_bits; 910 int s_inode_size; 911 int s_first_ino; 912 unsigned int s_inode_readahead_blks; 913 unsigned int s_inode_goal; 914 spinlock_t s_next_gen_lock; 915 u32 s_next_generation; 916 u32 s_hash_seed[4]; 917 int s_def_hash_version; 918 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 919 struct percpu_counter s_freeblocks_counter; 920 struct percpu_counter s_freeinodes_counter; 921 struct percpu_counter s_dirs_counter; 922 struct percpu_counter s_dirtyblocks_counter; 923 struct blockgroup_lock *s_blockgroup_lock; 924 struct proc_dir_entry *s_proc; 925 struct kobject s_kobj; 926 struct completion s_kobj_unregister; 927 928 /* Journaling */ 929 struct inode *s_journal_inode; 930 struct journal_s *s_journal; 931 struct list_head s_orphan; 932 struct mutex s_orphan_lock; 933 struct mutex s_resize_lock; 934 unsigned long s_commit_interval; 935 u32 s_max_batch_time; 936 u32 s_min_batch_time; 937 struct block_device *journal_bdev; 938 #ifdef CONFIG_JBD2_DEBUG 939 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 940 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 941 #endif 942 #ifdef CONFIG_QUOTA 943 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 944 int s_jquota_fmt; /* Format of quota to use */ 945 #endif 946 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 947 struct rb_root system_blks; 948 949 #ifdef EXTENTS_STATS 950 /* ext4 extents stats */ 951 unsigned long s_ext_min; 952 unsigned long s_ext_max; 953 unsigned long s_depth_max; 954 spinlock_t s_ext_stats_lock; 955 unsigned long s_ext_blocks; 956 unsigned long s_ext_extents; 957 #endif 958 959 /* for buddy allocator */ 960 struct ext4_group_info ***s_group_info; 961 struct inode *s_buddy_cache; 962 long s_blocks_reserved; 963 spinlock_t s_reserve_lock; 964 spinlock_t s_md_lock; 965 tid_t s_last_transaction; 966 unsigned short *s_mb_offsets; 967 unsigned int *s_mb_maxs; 968 969 /* tunables */ 970 unsigned long s_stripe; 971 unsigned int s_mb_stream_request; 972 unsigned int s_mb_max_to_scan; 973 unsigned int s_mb_min_to_scan; 974 unsigned int s_mb_stats; 975 unsigned int s_mb_order2_reqs; 976 unsigned int s_mb_group_prealloc; 977 unsigned int s_max_writeback_mb_bump; 978 /* where last allocation was done - for stream allocation */ 979 unsigned long s_mb_last_group; 980 unsigned long s_mb_last_start; 981 982 /* stats for buddy allocator */ 983 spinlock_t s_mb_pa_lock; 984 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 985 atomic_t s_bal_success; /* we found long enough chunks */ 986 atomic_t s_bal_allocated; /* in blocks */ 987 atomic_t s_bal_ex_scanned; /* total extents scanned */ 988 atomic_t s_bal_goals; /* goal hits */ 989 atomic_t s_bal_breaks; /* too long searches */ 990 atomic_t s_bal_2orders; /* 2^order hits */ 991 spinlock_t s_bal_lock; 992 unsigned long s_mb_buddies_generated; 993 unsigned long long s_mb_generation_time; 994 atomic_t s_mb_lost_chunks; 995 atomic_t s_mb_preallocated; 996 atomic_t s_mb_discarded; 997 atomic_t s_lock_busy; 998 999 /* locality groups */ 1000 struct ext4_locality_group *s_locality_groups; 1001 1002 /* for write statistics */ 1003 unsigned long s_sectors_written_start; 1004 u64 s_kbytes_written; 1005 1006 unsigned int s_log_groups_per_flex; 1007 struct flex_groups *s_flex_groups; 1008 1009 /* workqueue for dio unwritten */ 1010 struct workqueue_struct *dio_unwritten_wq; 1011 }; 1012 1013 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1014 { 1015 return sb->s_fs_info; 1016 } 1017 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1018 { 1019 return container_of(inode, struct ext4_inode_info, vfs_inode); 1020 } 1021 1022 static inline struct timespec ext4_current_time(struct inode *inode) 1023 { 1024 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1025 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1026 } 1027 1028 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1029 { 1030 return ino == EXT4_ROOT_INO || 1031 ino == EXT4_JOURNAL_INO || 1032 ino == EXT4_RESIZE_INO || 1033 (ino >= EXT4_FIRST_INO(sb) && 1034 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1035 } 1036 #else 1037 /* Assume that user mode programs are passing in an ext4fs superblock, not 1038 * a kernel struct super_block. This will allow us to call the feature-test 1039 * macros from user land. */ 1040 #define EXT4_SB(sb) (sb) 1041 #endif 1042 1043 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1044 1045 /* 1046 * Codes for operating systems 1047 */ 1048 #define EXT4_OS_LINUX 0 1049 #define EXT4_OS_HURD 1 1050 #define EXT4_OS_MASIX 2 1051 #define EXT4_OS_FREEBSD 3 1052 #define EXT4_OS_LITES 4 1053 1054 /* 1055 * Revision levels 1056 */ 1057 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1058 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1059 1060 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1061 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1062 1063 #define EXT4_GOOD_OLD_INODE_SIZE 128 1064 1065 /* 1066 * Feature set definitions 1067 */ 1068 1069 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1070 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1071 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1072 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1073 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1074 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1075 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1076 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1077 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1078 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1079 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1080 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1081 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1082 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1083 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1084 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1085 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1086 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1087 1088 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1089 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1090 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1091 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1092 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1093 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1094 1095 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1096 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1097 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1098 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1099 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1100 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1101 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1102 1103 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1104 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1105 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1106 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1107 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1108 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1109 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1110 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1111 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1112 1113 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1114 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1115 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1116 EXT4_FEATURE_INCOMPAT_META_BG| \ 1117 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1118 EXT4_FEATURE_INCOMPAT_64BIT| \ 1119 EXT4_FEATURE_INCOMPAT_FLEX_BG) 1120 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1121 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1122 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1123 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1124 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1125 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1126 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1127 1128 /* 1129 * Default values for user and/or group using reserved blocks 1130 */ 1131 #define EXT4_DEF_RESUID 0 1132 #define EXT4_DEF_RESGID 0 1133 1134 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1135 1136 /* 1137 * Default mount options 1138 */ 1139 #define EXT4_DEFM_DEBUG 0x0001 1140 #define EXT4_DEFM_BSDGROUPS 0x0002 1141 #define EXT4_DEFM_XATTR_USER 0x0004 1142 #define EXT4_DEFM_ACL 0x0008 1143 #define EXT4_DEFM_UID16 0x0010 1144 #define EXT4_DEFM_JMODE 0x0060 1145 #define EXT4_DEFM_JMODE_DATA 0x0020 1146 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1147 #define EXT4_DEFM_JMODE_WBACK 0x0060 1148 1149 /* 1150 * Default journal batch times 1151 */ 1152 #define EXT4_DEF_MIN_BATCH_TIME 0 1153 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1154 1155 /* 1156 * Minimum number of groups in a flexgroup before we separate out 1157 * directories into the first block group of a flexgroup 1158 */ 1159 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1160 1161 /* 1162 * Structure of a directory entry 1163 */ 1164 #define EXT4_NAME_LEN 255 1165 1166 struct ext4_dir_entry { 1167 __le32 inode; /* Inode number */ 1168 __le16 rec_len; /* Directory entry length */ 1169 __le16 name_len; /* Name length */ 1170 char name[EXT4_NAME_LEN]; /* File name */ 1171 }; 1172 1173 /* 1174 * The new version of the directory entry. Since EXT4 structures are 1175 * stored in intel byte order, and the name_len field could never be 1176 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1177 * file_type field. 1178 */ 1179 struct ext4_dir_entry_2 { 1180 __le32 inode; /* Inode number */ 1181 __le16 rec_len; /* Directory entry length */ 1182 __u8 name_len; /* Name length */ 1183 __u8 file_type; 1184 char name[EXT4_NAME_LEN]; /* File name */ 1185 }; 1186 1187 /* 1188 * Ext4 directory file types. Only the low 3 bits are used. The 1189 * other bits are reserved for now. 1190 */ 1191 #define EXT4_FT_UNKNOWN 0 1192 #define EXT4_FT_REG_FILE 1 1193 #define EXT4_FT_DIR 2 1194 #define EXT4_FT_CHRDEV 3 1195 #define EXT4_FT_BLKDEV 4 1196 #define EXT4_FT_FIFO 5 1197 #define EXT4_FT_SOCK 6 1198 #define EXT4_FT_SYMLINK 7 1199 1200 #define EXT4_FT_MAX 8 1201 1202 /* 1203 * EXT4_DIR_PAD defines the directory entries boundaries 1204 * 1205 * NOTE: It must be a multiple of 4 1206 */ 1207 #define EXT4_DIR_PAD 4 1208 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1209 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1210 ~EXT4_DIR_ROUND) 1211 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1212 1213 /* 1214 * Hash Tree Directory indexing 1215 * (c) Daniel Phillips, 2001 1216 */ 1217 1218 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1219 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1220 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 1221 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1222 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1223 1224 /* Legal values for the dx_root hash_version field: */ 1225 1226 #define DX_HASH_LEGACY 0 1227 #define DX_HASH_HALF_MD4 1 1228 #define DX_HASH_TEA 2 1229 #define DX_HASH_LEGACY_UNSIGNED 3 1230 #define DX_HASH_HALF_MD4_UNSIGNED 4 1231 #define DX_HASH_TEA_UNSIGNED 5 1232 1233 #ifdef __KERNEL__ 1234 1235 /* hash info structure used by the directory hash */ 1236 struct dx_hash_info 1237 { 1238 u32 hash; 1239 u32 minor_hash; 1240 int hash_version; 1241 u32 *seed; 1242 }; 1243 1244 #define EXT4_HTREE_EOF 0x7fffffff 1245 1246 /* 1247 * Control parameters used by ext4_htree_next_block 1248 */ 1249 #define HASH_NB_ALWAYS 1 1250 1251 1252 /* 1253 * Describe an inode's exact location on disk and in memory 1254 */ 1255 struct ext4_iloc 1256 { 1257 struct buffer_head *bh; 1258 unsigned long offset; 1259 ext4_group_t block_group; 1260 }; 1261 1262 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1263 { 1264 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1265 } 1266 1267 /* 1268 * This structure is stuffed into the struct file's private_data field 1269 * for directories. It is where we put information so that we can do 1270 * readdir operations in hash tree order. 1271 */ 1272 struct dir_private_info { 1273 struct rb_root root; 1274 struct rb_node *curr_node; 1275 struct fname *extra_fname; 1276 loff_t last_pos; 1277 __u32 curr_hash; 1278 __u32 curr_minor_hash; 1279 __u32 next_hash; 1280 }; 1281 1282 /* calculate the first block number of the group */ 1283 static inline ext4_fsblk_t 1284 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1285 { 1286 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1287 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1288 } 1289 1290 /* 1291 * Special error return code only used by dx_probe() and its callers. 1292 */ 1293 #define ERR_BAD_DX_DIR -75000 1294 1295 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1296 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1297 1298 extern struct proc_dir_entry *ext4_proc_root; 1299 1300 /* 1301 * Function prototypes 1302 */ 1303 1304 /* 1305 * Ok, these declarations are also in <linux/kernel.h> but none of the 1306 * ext4 source programs needs to include it so they are duplicated here. 1307 */ 1308 # define NORET_TYPE /**/ 1309 # define ATTRIB_NORET __attribute__((noreturn)) 1310 # define NORET_AND noreturn, 1311 1312 /* bitmap.c */ 1313 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1314 1315 /* balloc.c */ 1316 extern unsigned int ext4_block_group(struct super_block *sb, 1317 ext4_fsblk_t blocknr); 1318 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1319 ext4_fsblk_t blocknr); 1320 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1321 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1322 ext4_group_t group); 1323 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1324 ext4_fsblk_t goal, unsigned long *count, int *errp); 1325 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1326 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1327 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1328 ext4_fsblk_t block, unsigned long count, int metadata); 1329 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1330 ext4_fsblk_t block, unsigned long count); 1331 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1332 extern void ext4_check_blocks_bitmap(struct super_block *); 1333 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1334 ext4_group_t block_group, 1335 struct buffer_head ** bh); 1336 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1337 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1338 ext4_group_t block_group); 1339 extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1340 struct buffer_head *bh, 1341 ext4_group_t group, 1342 struct ext4_group_desc *desc); 1343 #define ext4_free_blocks_after_init(sb, group, desc) \ 1344 ext4_init_block_bitmap(sb, NULL, group, desc) 1345 1346 /* dir.c */ 1347 extern int ext4_check_dir_entry(const char *, struct inode *, 1348 struct ext4_dir_entry_2 *, 1349 struct buffer_head *, unsigned int); 1350 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1351 __u32 minor_hash, 1352 struct ext4_dir_entry_2 *dirent); 1353 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1354 1355 /* fsync.c */ 1356 extern int ext4_sync_file(struct file *, struct dentry *, int); 1357 1358 /* hash.c */ 1359 extern int ext4fs_dirhash(const char *name, int len, struct 1360 dx_hash_info *hinfo); 1361 1362 /* ialloc.c */ 1363 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 1364 const struct qstr *qstr, __u32 goal); 1365 extern void ext4_free_inode(handle_t *, struct inode *); 1366 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1367 extern unsigned long ext4_count_free_inodes(struct super_block *); 1368 extern unsigned long ext4_count_dirs(struct super_block *); 1369 extern void ext4_check_inodes_bitmap(struct super_block *); 1370 extern unsigned ext4_init_inode_bitmap(struct super_block *sb, 1371 struct buffer_head *bh, 1372 ext4_group_t group, 1373 struct ext4_group_desc *desc); 1374 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1375 1376 /* mballoc.c */ 1377 extern long ext4_mb_stats; 1378 extern long ext4_mb_max_to_scan; 1379 extern int ext4_mb_init(struct super_block *, int); 1380 extern int ext4_mb_release(struct super_block *); 1381 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1382 struct ext4_allocation_request *, int *); 1383 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1384 extern void ext4_discard_preallocations(struct inode *); 1385 extern int __init init_ext4_mballoc(void); 1386 extern void exit_ext4_mballoc(void); 1387 extern void ext4_mb_free_blocks(handle_t *, struct inode *, 1388 ext4_fsblk_t, unsigned long, int, unsigned long *); 1389 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1390 ext4_group_t i, struct ext4_group_desc *desc); 1391 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1392 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1393 ext4_group_t, int); 1394 /* inode.c */ 1395 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 1396 struct buffer_head *bh, ext4_fsblk_t blocknr); 1397 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1398 ext4_lblk_t, int, int *); 1399 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1400 ext4_lblk_t, int, int *); 1401 int ext4_get_block(struct inode *inode, sector_t iblock, 1402 struct buffer_head *bh_result, int create); 1403 1404 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1405 extern int ext4_write_inode(struct inode *, int); 1406 extern int ext4_setattr(struct dentry *, struct iattr *); 1407 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1408 struct kstat *stat); 1409 extern void ext4_delete_inode(struct inode *); 1410 extern int ext4_sync_inode(handle_t *, struct inode *); 1411 extern void ext4_dirty_inode(struct inode *); 1412 extern int ext4_change_inode_journal_flag(struct inode *, int); 1413 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1414 extern int ext4_can_truncate(struct inode *inode); 1415 extern void ext4_truncate(struct inode *); 1416 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1417 extern void ext4_set_inode_flags(struct inode *); 1418 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1419 extern int ext4_alloc_da_blocks(struct inode *inode); 1420 extern void ext4_set_aops(struct inode *inode); 1421 extern int ext4_writepage_trans_blocks(struct inode *); 1422 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1423 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1424 extern int ext4_block_truncate_page(handle_t *handle, 1425 struct address_space *mapping, loff_t from); 1426 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1427 extern qsize_t ext4_get_reserved_space(struct inode *inode); 1428 extern int flush_aio_dio_completed_IO(struct inode *inode); 1429 /* ioctl.c */ 1430 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1431 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1432 1433 /* migrate.c */ 1434 extern int ext4_ext_migrate(struct inode *); 1435 1436 /* namei.c */ 1437 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 1438 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 1439 extern int ext4_orphan_add(handle_t *, struct inode *); 1440 extern int ext4_orphan_del(handle_t *, struct inode *); 1441 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1442 __u32 start_minor_hash, __u32 *next_hash); 1443 1444 /* resize.c */ 1445 extern int ext4_group_add(struct super_block *sb, 1446 struct ext4_new_group_data *input); 1447 extern int ext4_group_extend(struct super_block *sb, 1448 struct ext4_super_block *es, 1449 ext4_fsblk_t n_blocks_count); 1450 1451 /* super.c */ 1452 extern void ext4_error(struct super_block *, const char *, const char *, ...) 1453 __attribute__ ((format (printf, 3, 4))); 1454 extern void __ext4_std_error(struct super_block *, const char *, int); 1455 extern void ext4_abort(struct super_block *, const char *, const char *, ...) 1456 __attribute__ ((format (printf, 3, 4))); 1457 extern void ext4_warning(struct super_block *, const char *, const char *, ...) 1458 __attribute__ ((format (printf, 3, 4))); 1459 extern void ext4_msg(struct super_block *, const char *, const char *, ...) 1460 __attribute__ ((format (printf, 3, 4))); 1461 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 1462 const char *, const char *, ...) 1463 __attribute__ ((format (printf, 4, 5))); 1464 extern void ext4_update_dynamic_rev(struct super_block *sb); 1465 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1466 __u32 compat); 1467 extern int ext4_update_rocompat_feature(handle_t *handle, 1468 struct super_block *sb, __u32 rocompat); 1469 extern int ext4_update_incompat_feature(handle_t *handle, 1470 struct super_block *sb, __u32 incompat); 1471 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1472 struct ext4_group_desc *bg); 1473 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1474 struct ext4_group_desc *bg); 1475 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1476 struct ext4_group_desc *bg); 1477 extern __u32 ext4_free_blks_count(struct super_block *sb, 1478 struct ext4_group_desc *bg); 1479 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1480 struct ext4_group_desc *bg); 1481 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1482 struct ext4_group_desc *bg); 1483 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1484 struct ext4_group_desc *bg); 1485 extern void ext4_block_bitmap_set(struct super_block *sb, 1486 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1487 extern void ext4_inode_bitmap_set(struct super_block *sb, 1488 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1489 extern void ext4_inode_table_set(struct super_block *sb, 1490 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1491 extern void ext4_free_blks_set(struct super_block *sb, 1492 struct ext4_group_desc *bg, __u32 count); 1493 extern void ext4_free_inodes_set(struct super_block *sb, 1494 struct ext4_group_desc *bg, __u32 count); 1495 extern void ext4_used_dirs_set(struct super_block *sb, 1496 struct ext4_group_desc *bg, __u32 count); 1497 extern void ext4_itable_unused_set(struct super_block *sb, 1498 struct ext4_group_desc *bg, __u32 count); 1499 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1500 struct ext4_group_desc *gdp); 1501 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1502 struct ext4_group_desc *gdp); 1503 1504 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1505 { 1506 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1507 le32_to_cpu(es->s_blocks_count_lo); 1508 } 1509 1510 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1511 { 1512 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1513 le32_to_cpu(es->s_r_blocks_count_lo); 1514 } 1515 1516 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1517 { 1518 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1519 le32_to_cpu(es->s_free_blocks_count_lo); 1520 } 1521 1522 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1523 ext4_fsblk_t blk) 1524 { 1525 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1526 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1527 } 1528 1529 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1530 ext4_fsblk_t blk) 1531 { 1532 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1533 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1534 } 1535 1536 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1537 ext4_fsblk_t blk) 1538 { 1539 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1540 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1541 } 1542 1543 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1544 { 1545 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1546 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1547 le32_to_cpu(raw_inode->i_size_lo); 1548 else 1549 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1550 } 1551 1552 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1553 { 1554 raw_inode->i_size_lo = cpu_to_le32(i_size); 1555 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1556 } 1557 1558 static inline 1559 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1560 ext4_group_t group) 1561 { 1562 struct ext4_group_info ***grp_info; 1563 long indexv, indexh; 1564 grp_info = EXT4_SB(sb)->s_group_info; 1565 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1566 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1567 return grp_info[indexv][indexh]; 1568 } 1569 1570 /* 1571 * Reading s_groups_count requires using smp_rmb() afterwards. See 1572 * the locking protocol documented in the comments of ext4_group_add() 1573 * in resize.c 1574 */ 1575 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1576 { 1577 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1578 1579 smp_rmb(); 1580 return ngroups; 1581 } 1582 1583 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1584 ext4_group_t block_group) 1585 { 1586 return block_group >> sbi->s_log_groups_per_flex; 1587 } 1588 1589 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1590 { 1591 return 1 << sbi->s_log_groups_per_flex; 1592 } 1593 1594 #define ext4_std_error(sb, errno) \ 1595 do { \ 1596 if ((errno)) \ 1597 __ext4_std_error((sb), __func__, (errno)); \ 1598 } while (0) 1599 1600 #ifdef CONFIG_SMP 1601 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1602 * counters. So we need to make sure we have free blocks more 1603 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1604 */ 1605 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1606 #else 1607 #define EXT4_FREEBLOCKS_WATERMARK 0 1608 #endif 1609 1610 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1611 { 1612 /* 1613 * XXX: replace with spinlock if seen contended -bzzz 1614 */ 1615 down_write(&EXT4_I(inode)->i_data_sem); 1616 if (newsize > EXT4_I(inode)->i_disksize) 1617 EXT4_I(inode)->i_disksize = newsize; 1618 up_write(&EXT4_I(inode)->i_data_sem); 1619 return ; 1620 } 1621 1622 struct ext4_group_info { 1623 unsigned long bb_state; 1624 struct rb_root bb_free_root; 1625 ext4_grpblk_t bb_first_free; /* first free block */ 1626 ext4_grpblk_t bb_free; /* total free blocks */ 1627 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 1628 struct list_head bb_prealloc_list; 1629 #ifdef DOUBLE_CHECK 1630 void *bb_bitmap; 1631 #endif 1632 struct rw_semaphore alloc_sem; 1633 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 1634 * regions, index is order. 1635 * bb_counters[3] = 5 means 1636 * 5 free 8-block regions. */ 1637 }; 1638 1639 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1640 1641 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1642 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1643 1644 #define EXT4_MAX_CONTENTION 8 1645 #define EXT4_CONTENTION_THRESHOLD 2 1646 1647 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 1648 ext4_group_t group) 1649 { 1650 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 1651 } 1652 1653 /* 1654 * Returns true if the filesystem is busy enough that attempts to 1655 * access the block group locks has run into contention. 1656 */ 1657 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 1658 { 1659 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 1660 } 1661 1662 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1663 { 1664 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 1665 if (spin_trylock(lock)) 1666 /* 1667 * We're able to grab the lock right away, so drop the 1668 * lock contention counter. 1669 */ 1670 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 1671 else { 1672 /* 1673 * The lock is busy, so bump the contention counter, 1674 * and then wait on the spin lock. 1675 */ 1676 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 1677 EXT4_MAX_CONTENTION); 1678 spin_lock(lock); 1679 } 1680 } 1681 1682 static inline void ext4_unlock_group(struct super_block *sb, 1683 ext4_group_t group) 1684 { 1685 spin_unlock(ext4_group_lock_ptr(sb, group)); 1686 } 1687 1688 /* 1689 * Inodes and files operations 1690 */ 1691 1692 /* dir.c */ 1693 extern const struct file_operations ext4_dir_operations; 1694 1695 /* file.c */ 1696 extern const struct inode_operations ext4_file_inode_operations; 1697 extern const struct file_operations ext4_file_operations; 1698 1699 /* namei.c */ 1700 extern const struct inode_operations ext4_dir_inode_operations; 1701 extern const struct inode_operations ext4_special_inode_operations; 1702 extern struct dentry *ext4_get_parent(struct dentry *child); 1703 1704 /* symlink.c */ 1705 extern const struct inode_operations ext4_symlink_inode_operations; 1706 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1707 1708 /* block_validity */ 1709 extern void ext4_release_system_zone(struct super_block *sb); 1710 extern int ext4_setup_system_zone(struct super_block *sb); 1711 extern int __init init_ext4_system_zone(void); 1712 extern void exit_ext4_system_zone(void); 1713 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 1714 ext4_fsblk_t start_blk, 1715 unsigned int count); 1716 1717 /* extents.c */ 1718 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1719 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1720 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1721 int chunk); 1722 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1723 ext4_lblk_t iblock, unsigned int max_blocks, 1724 struct buffer_head *bh_result, int flags); 1725 extern void ext4_ext_truncate(struct inode *); 1726 extern void ext4_ext_init(struct super_block *); 1727 extern void ext4_ext_release(struct super_block *); 1728 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1729 loff_t len); 1730 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 1731 loff_t len); 1732 extern int ext4_get_blocks(handle_t *handle, struct inode *inode, 1733 sector_t block, unsigned int max_blocks, 1734 struct buffer_head *bh, int flags); 1735 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1736 __u64 start, __u64 len); 1737 /* move_extent.c */ 1738 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 1739 __u64 start_orig, __u64 start_donor, 1740 __u64 len, __u64 *moved_len); 1741 1742 1743 /* 1744 * Add new method to test wether block and inode bitmaps are properly 1745 * initialized. With uninit_bg reading the block from disk is not enough 1746 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1747 */ 1748 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1749 1750 static inline int bitmap_uptodate(struct buffer_head *bh) 1751 { 1752 return (buffer_uptodate(bh) && 1753 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1754 } 1755 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1756 { 1757 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1758 } 1759 1760 #endif /* __KERNEL__ */ 1761 1762 #endif /* _EXT4_H */ 1763