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 * For delayed allocation tracking 130 */ 131 struct mpage_da_data { 132 struct inode *inode; 133 sector_t b_blocknr; /* start block number of extent */ 134 size_t b_size; /* size of extent */ 135 unsigned long b_state; /* state of the extent */ 136 unsigned long first_page, next_page; /* extent of pages */ 137 struct writeback_control *wbc; 138 int io_done; 139 int pages_written; 140 int retval; 141 }; 142 #define EXT4_IO_UNWRITTEN 0x1 143 typedef struct ext4_io_end { 144 struct list_head list; /* per-file finished AIO list */ 145 struct inode *inode; /* file being written to */ 146 unsigned int flag; /* unwritten or not */ 147 struct page *page; /* page struct for buffer write */ 148 loff_t offset; /* offset in the file */ 149 ssize_t size; /* size of the extent */ 150 struct work_struct work; /* data work queue */ 151 } ext4_io_end_t; 152 153 /* 154 * Special inodes numbers 155 */ 156 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 157 #define EXT4_ROOT_INO 2 /* Root inode */ 158 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 159 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 160 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 161 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 162 163 /* First non-reserved inode for old ext4 filesystems */ 164 #define EXT4_GOOD_OLD_FIRST_INO 11 165 166 /* 167 * Maximal count of links to a file 168 */ 169 #define EXT4_LINK_MAX 65000 170 171 /* 172 * Macro-instructions used to manage several block sizes 173 */ 174 #define EXT4_MIN_BLOCK_SIZE 1024 175 #define EXT4_MAX_BLOCK_SIZE 65536 176 #define EXT4_MIN_BLOCK_LOG_SIZE 10 177 #ifdef __KERNEL__ 178 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 179 #else 180 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 181 #endif 182 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 183 #ifdef __KERNEL__ 184 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 185 #else 186 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 187 #endif 188 #ifdef __KERNEL__ 189 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 190 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 191 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 192 #else 193 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 194 EXT4_GOOD_OLD_INODE_SIZE : \ 195 (s)->s_inode_size) 196 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 197 EXT4_GOOD_OLD_FIRST_INO : \ 198 (s)->s_first_ino) 199 #endif 200 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 201 202 /* 203 * Structure of a blocks group descriptor 204 */ 205 struct ext4_group_desc 206 { 207 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 208 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 209 __le32 bg_inode_table_lo; /* Inodes table block */ 210 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 211 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 212 __le16 bg_used_dirs_count_lo; /* Directories count */ 213 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 214 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 215 __le16 bg_itable_unused_lo; /* Unused inodes count */ 216 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 217 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 218 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 219 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 220 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 221 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 222 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 223 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 224 __u32 bg_reserved2[3]; 225 }; 226 227 /* 228 * Structure of a flex block group info 229 */ 230 231 struct flex_groups { 232 atomic_t free_inodes; 233 atomic_t free_blocks; 234 atomic_t used_dirs; 235 }; 236 237 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 238 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 239 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 240 241 /* 242 * Macro-instructions used to manage group descriptors 243 */ 244 #define EXT4_MIN_DESC_SIZE 32 245 #define EXT4_MIN_DESC_SIZE_64BIT 64 246 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 247 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 248 #ifdef __KERNEL__ 249 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 250 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 251 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 252 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 253 #else 254 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 255 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 256 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 257 #endif 258 259 /* 260 * Constants relative to the data blocks 261 */ 262 #define EXT4_NDIR_BLOCKS 12 263 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 264 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 265 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 266 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 267 268 /* 269 * Inode flags 270 */ 271 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 272 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 273 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 274 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 275 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 276 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 277 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 278 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 279 /* Reserved for compression usage... */ 280 #define EXT4_DIRTY_FL 0x00000100 281 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 282 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 283 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 284 /* End compression flags --- maybe not all used */ 285 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 286 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 287 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 288 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 289 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 290 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 291 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 292 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 293 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 294 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 295 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 296 297 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 298 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 299 300 /* Flags that should be inherited by new inodes from their parent. */ 301 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 302 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 303 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 304 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 305 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 306 307 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 308 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 309 310 /* Flags that are appropriate for non-directories/regular files. */ 311 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 312 313 /* Mask out flags that are inappropriate for the given type of inode. */ 314 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 315 { 316 if (S_ISDIR(mode)) 317 return flags; 318 else if (S_ISREG(mode)) 319 return flags & EXT4_REG_FLMASK; 320 else 321 return flags & EXT4_OTHER_FLMASK; 322 } 323 324 /* Used to pass group descriptor data when online resize is done */ 325 struct ext4_new_group_input { 326 __u32 group; /* Group number for this data */ 327 __u64 block_bitmap; /* Absolute block number of block bitmap */ 328 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 329 __u64 inode_table; /* Absolute block number of inode table start */ 330 __u32 blocks_count; /* Total number of blocks in this group */ 331 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 332 __u16 unused; 333 }; 334 335 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 336 struct ext4_new_group_data { 337 __u32 group; 338 __u64 block_bitmap; 339 __u64 inode_bitmap; 340 __u64 inode_table; 341 __u32 blocks_count; 342 __u16 reserved_blocks; 343 __u16 unused; 344 __u32 free_blocks_count; 345 }; 346 347 /* 348 * Flags used by ext4_get_blocks() 349 */ 350 /* Allocate any needed blocks and/or convert an unitialized 351 extent to be an initialized ext4 */ 352 #define EXT4_GET_BLOCKS_CREATE 0x0001 353 /* Request the creation of an unitialized extent */ 354 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 355 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 356 EXT4_GET_BLOCKS_CREATE) 357 /* Caller is from the delayed allocation writeout path, 358 so set the magic i_delalloc_reserve_flag after taking the 359 inode allocation semaphore for */ 360 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 361 /* caller is from the direct IO path, request to creation of an 362 unitialized extents if not allocated, split the uninitialized 363 extent if blocks has been preallocated already*/ 364 #define EXT4_GET_BLOCKS_PRE_IO 0x0008 365 #define EXT4_GET_BLOCKS_CONVERT 0x0010 366 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 367 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 368 /* Convert extent to initialized after IO complete */ 369 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 370 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 371 372 /* 373 * Flags used by ext4_free_blocks 374 */ 375 #define EXT4_FREE_BLOCKS_METADATA 0x0001 376 #define EXT4_FREE_BLOCKS_FORGET 0x0002 377 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004 378 379 /* 380 * ioctl commands 381 */ 382 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 383 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 384 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 385 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 386 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 387 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 388 #ifdef CONFIG_JBD2_DEBUG 389 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 390 #endif 391 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 392 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 393 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 394 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 395 #define EXT4_IOC_MIGRATE _IO('f', 9) 396 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 397 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 398 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 399 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 400 401 /* 402 * ioctl commands in 32 bit emulation 403 */ 404 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 405 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 406 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 407 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 408 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 409 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 410 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 411 #ifdef CONFIG_JBD2_DEBUG 412 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 413 #endif 414 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 415 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 416 417 418 /* 419 * Mount options 420 */ 421 struct ext4_mount_options { 422 unsigned long s_mount_opt; 423 uid_t s_resuid; 424 gid_t s_resgid; 425 unsigned long s_commit_interval; 426 u32 s_min_batch_time, s_max_batch_time; 427 #ifdef CONFIG_QUOTA 428 int s_jquota_fmt; 429 char *s_qf_names[MAXQUOTAS]; 430 #endif 431 }; 432 433 /* Max physical block we can addres w/o extents */ 434 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 435 436 /* 437 * Structure of an inode on the disk 438 */ 439 struct ext4_inode { 440 __le16 i_mode; /* File mode */ 441 __le16 i_uid; /* Low 16 bits of Owner Uid */ 442 __le32 i_size_lo; /* Size in bytes */ 443 __le32 i_atime; /* Access time */ 444 __le32 i_ctime; /* Inode Change time */ 445 __le32 i_mtime; /* Modification time */ 446 __le32 i_dtime; /* Deletion Time */ 447 __le16 i_gid; /* Low 16 bits of Group Id */ 448 __le16 i_links_count; /* Links count */ 449 __le32 i_blocks_lo; /* Blocks count */ 450 __le32 i_flags; /* File flags */ 451 union { 452 struct { 453 __le32 l_i_version; 454 } linux1; 455 struct { 456 __u32 h_i_translator; 457 } hurd1; 458 struct { 459 __u32 m_i_reserved1; 460 } masix1; 461 } osd1; /* OS dependent 1 */ 462 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 463 __le32 i_generation; /* File version (for NFS) */ 464 __le32 i_file_acl_lo; /* File ACL */ 465 __le32 i_size_high; 466 __le32 i_obso_faddr; /* Obsoleted fragment address */ 467 union { 468 struct { 469 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 470 __le16 l_i_file_acl_high; 471 __le16 l_i_uid_high; /* these 2 fields */ 472 __le16 l_i_gid_high; /* were reserved2[0] */ 473 __u32 l_i_reserved2; 474 } linux2; 475 struct { 476 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 477 __u16 h_i_mode_high; 478 __u16 h_i_uid_high; 479 __u16 h_i_gid_high; 480 __u32 h_i_author; 481 } hurd2; 482 struct { 483 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 484 __le16 m_i_file_acl_high; 485 __u32 m_i_reserved2[2]; 486 } masix2; 487 } osd2; /* OS dependent 2 */ 488 __le16 i_extra_isize; 489 __le16 i_pad1; 490 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 491 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 492 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 493 __le32 i_crtime; /* File Creation time */ 494 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 495 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 496 }; 497 498 struct move_extent { 499 __u32 reserved; /* should be zero */ 500 __u32 donor_fd; /* donor file descriptor */ 501 __u64 orig_start; /* logical start offset in block for orig */ 502 __u64 donor_start; /* logical start offset in block for donor */ 503 __u64 len; /* block length to be moved */ 504 __u64 moved_len; /* moved block length */ 505 }; 506 507 #define EXT4_EPOCH_BITS 2 508 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 509 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 510 511 /* 512 * Extended fields will fit into an inode if the filesystem was formatted 513 * with large inodes (-I 256 or larger) and there are not currently any EAs 514 * consuming all of the available space. For new inodes we always reserve 515 * enough space for the kernel's known extended fields, but for inodes 516 * created with an old kernel this might not have been the case. None of 517 * the extended inode fields is critical for correct filesystem operation. 518 * This macro checks if a certain field fits in the inode. Note that 519 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 520 */ 521 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 522 ((offsetof(typeof(*ext4_inode), field) + \ 523 sizeof((ext4_inode)->field)) \ 524 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 525 (einode)->i_extra_isize)) \ 526 527 static inline __le32 ext4_encode_extra_time(struct timespec *time) 528 { 529 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 530 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 531 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 532 } 533 534 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 535 { 536 if (sizeof(time->tv_sec) > 4) 537 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 538 << 32; 539 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 540 } 541 542 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 543 do { \ 544 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 545 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 546 (raw_inode)->xtime ## _extra = \ 547 ext4_encode_extra_time(&(inode)->xtime); \ 548 } while (0) 549 550 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 551 do { \ 552 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 553 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 554 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 555 (raw_inode)->xtime ## _extra = \ 556 ext4_encode_extra_time(&(einode)->xtime); \ 557 } while (0) 558 559 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 560 do { \ 561 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 562 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 563 ext4_decode_extra_time(&(inode)->xtime, \ 564 raw_inode->xtime ## _extra); \ 565 } while (0) 566 567 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 568 do { \ 569 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 570 (einode)->xtime.tv_sec = \ 571 (signed)le32_to_cpu((raw_inode)->xtime); \ 572 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 573 ext4_decode_extra_time(&(einode)->xtime, \ 574 raw_inode->xtime ## _extra); \ 575 } while (0) 576 577 #define i_disk_version osd1.linux1.l_i_version 578 579 #if defined(__KERNEL__) || defined(__linux__) 580 #define i_reserved1 osd1.linux1.l_i_reserved1 581 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 582 #define i_blocks_high osd2.linux2.l_i_blocks_high 583 #define i_uid_low i_uid 584 #define i_gid_low i_gid 585 #define i_uid_high osd2.linux2.l_i_uid_high 586 #define i_gid_high osd2.linux2.l_i_gid_high 587 #define i_reserved2 osd2.linux2.l_i_reserved2 588 589 #elif defined(__GNU__) 590 591 #define i_translator osd1.hurd1.h_i_translator 592 #define i_uid_high osd2.hurd2.h_i_uid_high 593 #define i_gid_high osd2.hurd2.h_i_gid_high 594 #define i_author osd2.hurd2.h_i_author 595 596 #elif defined(__masix__) 597 598 #define i_reserved1 osd1.masix1.m_i_reserved1 599 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 600 #define i_reserved2 osd2.masix2.m_i_reserved2 601 602 #endif /* defined(__KERNEL__) || defined(__linux__) */ 603 604 /* 605 * storage for cached extent 606 */ 607 struct ext4_ext_cache { 608 ext4_fsblk_t ec_start; 609 ext4_lblk_t ec_block; 610 __u32 ec_len; /* must be 32bit to return holes */ 611 __u32 ec_type; 612 }; 613 614 /* 615 * fourth extended file system inode data in memory 616 */ 617 struct ext4_inode_info { 618 __le32 i_data[15]; /* unconverted */ 619 __u32 i_flags; 620 ext4_fsblk_t i_file_acl; 621 __u32 i_dtime; 622 623 /* 624 * i_block_group is the number of the block group which contains 625 * this file's inode. Constant across the lifetime of the inode, 626 * it is ued for making block allocation decisions - we try to 627 * place a file's data blocks near its inode block, and new inodes 628 * near to their parent directory's inode. 629 */ 630 ext4_group_t i_block_group; 631 unsigned long i_state_flags; /* Dynamic state flags */ 632 633 ext4_lblk_t i_dir_start_lookup; 634 #ifdef CONFIG_EXT4_FS_XATTR 635 /* 636 * Extended attributes can be read independently of the main file 637 * data. Taking i_mutex even when reading would cause contention 638 * between readers of EAs and writers of regular file data, so 639 * instead we synchronize on xattr_sem when reading or changing 640 * EAs. 641 */ 642 struct rw_semaphore xattr_sem; 643 #endif 644 645 struct list_head i_orphan; /* unlinked but open inodes */ 646 647 /* 648 * i_disksize keeps track of what the inode size is ON DISK, not 649 * in memory. During truncate, i_size is set to the new size by 650 * the VFS prior to calling ext4_truncate(), but the filesystem won't 651 * set i_disksize to 0 until the truncate is actually under way. 652 * 653 * The intent is that i_disksize always represents the blocks which 654 * are used by this file. This allows recovery to restart truncate 655 * on orphans if we crash during truncate. We actually write i_disksize 656 * into the on-disk inode when writing inodes out, instead of i_size. 657 * 658 * The only time when i_disksize and i_size may be different is when 659 * a truncate is in progress. The only things which change i_disksize 660 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 661 */ 662 loff_t i_disksize; 663 664 /* 665 * i_data_sem is for serialising ext4_truncate() against 666 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 667 * data tree are chopped off during truncate. We can't do that in 668 * ext4 because whenever we perform intermediate commits during 669 * truncate, the inode and all the metadata blocks *must* be in a 670 * consistent state which allows truncation of the orphans to restart 671 * during recovery. Hence we must fix the get_block-vs-truncate race 672 * by other means, so we have i_data_sem. 673 */ 674 struct rw_semaphore i_data_sem; 675 struct inode vfs_inode; 676 struct jbd2_inode jinode; 677 678 struct ext4_ext_cache i_cached_extent; 679 /* 680 * File creation time. Its function is same as that of 681 * struct timespec i_{a,c,m}time in the generic inode. 682 */ 683 struct timespec i_crtime; 684 685 /* mballoc */ 686 struct list_head i_prealloc_list; 687 spinlock_t i_prealloc_lock; 688 689 /* ialloc */ 690 ext4_group_t i_last_alloc_group; 691 692 /* allocation reservation info for delalloc */ 693 unsigned int i_reserved_data_blocks; 694 unsigned int i_reserved_meta_blocks; 695 unsigned int i_allocated_meta_blocks; 696 unsigned short i_delalloc_reserved_flag; 697 sector_t i_da_metadata_calc_last_lblock; 698 int i_da_metadata_calc_len; 699 700 /* on-disk additional length */ 701 __u16 i_extra_isize; 702 703 spinlock_t i_block_reservation_lock; 704 #ifdef CONFIG_QUOTA 705 /* quota space reservation, managed internally by quota code */ 706 qsize_t i_reserved_quota; 707 #endif 708 709 /* completed IOs that might need unwritten extents handling */ 710 struct list_head i_completed_io_list; 711 spinlock_t i_completed_io_lock; 712 /* current io_end structure for async DIO write*/ 713 ext4_io_end_t *cur_aio_dio; 714 715 /* 716 * Transactions that contain inode's metadata needed to complete 717 * fsync and fdatasync, respectively. 718 */ 719 tid_t i_sync_tid; 720 tid_t i_datasync_tid; 721 }; 722 723 /* 724 * File system states 725 */ 726 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 727 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 728 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 729 730 /* 731 * Misc. filesystem flags 732 */ 733 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 734 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 735 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 736 737 /* 738 * Mount flags 739 */ 740 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 741 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 742 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 743 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 744 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 745 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 746 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 747 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 748 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 749 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 750 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 751 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 752 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 753 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 754 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 755 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 756 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 757 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 758 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 759 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 760 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 761 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 762 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 763 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 764 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 765 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 766 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 767 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 768 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 769 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 770 771 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 772 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 773 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 774 EXT4_MOUNT_##opt) 775 776 #define ext4_set_bit ext2_set_bit 777 #define ext4_set_bit_atomic ext2_set_bit_atomic 778 #define ext4_clear_bit ext2_clear_bit 779 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 780 #define ext4_test_bit ext2_test_bit 781 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 782 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 783 #define ext4_find_next_bit ext2_find_next_bit 784 785 /* 786 * Maximal mount counts between two filesystem checks 787 */ 788 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 789 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 790 791 /* 792 * Behaviour when detecting errors 793 */ 794 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 795 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 796 #define EXT4_ERRORS_PANIC 3 /* Panic */ 797 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 798 799 /* 800 * Structure of the super block 801 */ 802 struct ext4_super_block { 803 /*00*/ __le32 s_inodes_count; /* Inodes count */ 804 __le32 s_blocks_count_lo; /* Blocks count */ 805 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 806 __le32 s_free_blocks_count_lo; /* Free blocks count */ 807 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 808 __le32 s_first_data_block; /* First Data Block */ 809 __le32 s_log_block_size; /* Block size */ 810 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 811 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 812 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 813 __le32 s_inodes_per_group; /* # Inodes per group */ 814 __le32 s_mtime; /* Mount time */ 815 /*30*/ __le32 s_wtime; /* Write time */ 816 __le16 s_mnt_count; /* Mount count */ 817 __le16 s_max_mnt_count; /* Maximal mount count */ 818 __le16 s_magic; /* Magic signature */ 819 __le16 s_state; /* File system state */ 820 __le16 s_errors; /* Behaviour when detecting errors */ 821 __le16 s_minor_rev_level; /* minor revision level */ 822 /*40*/ __le32 s_lastcheck; /* time of last check */ 823 __le32 s_checkinterval; /* max. time between checks */ 824 __le32 s_creator_os; /* OS */ 825 __le32 s_rev_level; /* Revision level */ 826 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 827 __le16 s_def_resgid; /* Default gid for reserved blocks */ 828 /* 829 * These fields are for EXT4_DYNAMIC_REV superblocks only. 830 * 831 * Note: the difference between the compatible feature set and 832 * the incompatible feature set is that if there is a bit set 833 * in the incompatible feature set that the kernel doesn't 834 * know about, it should refuse to mount the filesystem. 835 * 836 * e2fsck's requirements are more strict; if it doesn't know 837 * about a feature in either the compatible or incompatible 838 * feature set, it must abort and not try to meddle with 839 * things it doesn't understand... 840 */ 841 __le32 s_first_ino; /* First non-reserved inode */ 842 __le16 s_inode_size; /* size of inode structure */ 843 __le16 s_block_group_nr; /* block group # of this superblock */ 844 __le32 s_feature_compat; /* compatible feature set */ 845 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 846 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 847 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 848 /*78*/ char s_volume_name[16]; /* volume name */ 849 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 850 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 851 /* 852 * Performance hints. Directory preallocation should only 853 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 854 */ 855 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 856 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 857 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 858 /* 859 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 860 */ 861 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 862 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 863 __le32 s_journal_dev; /* device number of journal file */ 864 __le32 s_last_orphan; /* start of list of inodes to delete */ 865 __le32 s_hash_seed[4]; /* HTREE hash seed */ 866 __u8 s_def_hash_version; /* Default hash version to use */ 867 __u8 s_reserved_char_pad; 868 __le16 s_desc_size; /* size of group descriptor */ 869 /*100*/ __le32 s_default_mount_opts; 870 __le32 s_first_meta_bg; /* First metablock block group */ 871 __le32 s_mkfs_time; /* When the filesystem was created */ 872 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 873 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 874 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 875 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 876 __le32 s_free_blocks_count_hi; /* Free blocks count */ 877 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 878 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 879 __le32 s_flags; /* Miscellaneous flags */ 880 __le16 s_raid_stride; /* RAID stride */ 881 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 882 __le64 s_mmp_block; /* Block for multi-mount protection */ 883 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 884 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 885 __u8 s_reserved_char_pad2; 886 __le16 s_reserved_pad; 887 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 888 __u32 s_reserved[160]; /* Padding to the end of the block */ 889 }; 890 891 #ifdef __KERNEL__ 892 893 /* 894 * run-time mount flags 895 */ 896 #define EXT4_MF_MNTDIR_SAMPLED 0x0001 897 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 898 899 /* 900 * fourth extended-fs super-block data in memory 901 */ 902 struct ext4_sb_info { 903 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 904 unsigned long s_inodes_per_block;/* Number of inodes per block */ 905 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 906 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 907 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 908 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 909 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 910 ext4_group_t s_groups_count; /* Number of groups in the fs */ 911 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 912 unsigned long s_overhead_last; /* Last calculated overhead */ 913 unsigned long s_blocks_last; /* Last seen block count */ 914 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 915 struct buffer_head * s_sbh; /* Buffer containing the super block */ 916 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 917 struct buffer_head **s_group_desc; 918 unsigned int s_mount_opt; 919 unsigned int s_mount_flags; 920 ext4_fsblk_t s_sb_block; 921 uid_t s_resuid; 922 gid_t s_resgid; 923 unsigned short s_mount_state; 924 unsigned short s_pad; 925 int s_addr_per_block_bits; 926 int s_desc_per_block_bits; 927 int s_inode_size; 928 int s_first_ino; 929 unsigned int s_inode_readahead_blks; 930 unsigned int s_inode_goal; 931 spinlock_t s_next_gen_lock; 932 u32 s_next_generation; 933 u32 s_hash_seed[4]; 934 int s_def_hash_version; 935 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 936 struct percpu_counter s_freeblocks_counter; 937 struct percpu_counter s_freeinodes_counter; 938 struct percpu_counter s_dirs_counter; 939 struct percpu_counter s_dirtyblocks_counter; 940 struct blockgroup_lock *s_blockgroup_lock; 941 struct proc_dir_entry *s_proc; 942 struct kobject s_kobj; 943 struct completion s_kobj_unregister; 944 945 /* Journaling */ 946 struct inode *s_journal_inode; 947 struct journal_s *s_journal; 948 struct list_head s_orphan; 949 struct mutex s_orphan_lock; 950 struct mutex s_resize_lock; 951 unsigned long s_commit_interval; 952 u32 s_max_batch_time; 953 u32 s_min_batch_time; 954 struct block_device *journal_bdev; 955 #ifdef CONFIG_JBD2_DEBUG 956 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 957 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 958 #endif 959 #ifdef CONFIG_QUOTA 960 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 961 int s_jquota_fmt; /* Format of quota to use */ 962 #endif 963 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 964 struct rb_root system_blks; 965 966 #ifdef EXTENTS_STATS 967 /* ext4 extents stats */ 968 unsigned long s_ext_min; 969 unsigned long s_ext_max; 970 unsigned long s_depth_max; 971 spinlock_t s_ext_stats_lock; 972 unsigned long s_ext_blocks; 973 unsigned long s_ext_extents; 974 #endif 975 976 /* for buddy allocator */ 977 struct ext4_group_info ***s_group_info; 978 struct inode *s_buddy_cache; 979 long s_blocks_reserved; 980 spinlock_t s_reserve_lock; 981 spinlock_t s_md_lock; 982 tid_t s_last_transaction; 983 unsigned short *s_mb_offsets; 984 unsigned int *s_mb_maxs; 985 986 /* tunables */ 987 unsigned long s_stripe; 988 unsigned int s_mb_stream_request; 989 unsigned int s_mb_max_to_scan; 990 unsigned int s_mb_min_to_scan; 991 unsigned int s_mb_stats; 992 unsigned int s_mb_order2_reqs; 993 unsigned int s_mb_group_prealloc; 994 unsigned int s_max_writeback_mb_bump; 995 /* where last allocation was done - for stream allocation */ 996 unsigned long s_mb_last_group; 997 unsigned long s_mb_last_start; 998 999 /* stats for buddy allocator */ 1000 spinlock_t s_mb_pa_lock; 1001 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1002 atomic_t s_bal_success; /* we found long enough chunks */ 1003 atomic_t s_bal_allocated; /* in blocks */ 1004 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1005 atomic_t s_bal_goals; /* goal hits */ 1006 atomic_t s_bal_breaks; /* too long searches */ 1007 atomic_t s_bal_2orders; /* 2^order hits */ 1008 spinlock_t s_bal_lock; 1009 unsigned long s_mb_buddies_generated; 1010 unsigned long long s_mb_generation_time; 1011 atomic_t s_mb_lost_chunks; 1012 atomic_t s_mb_preallocated; 1013 atomic_t s_mb_discarded; 1014 atomic_t s_lock_busy; 1015 1016 /* locality groups */ 1017 struct ext4_locality_group __percpu *s_locality_groups; 1018 1019 /* for write statistics */ 1020 unsigned long s_sectors_written_start; 1021 u64 s_kbytes_written; 1022 1023 unsigned int s_log_groups_per_flex; 1024 struct flex_groups *s_flex_groups; 1025 1026 /* workqueue for dio unwritten */ 1027 struct workqueue_struct *dio_unwritten_wq; 1028 }; 1029 1030 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1031 { 1032 return sb->s_fs_info; 1033 } 1034 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1035 { 1036 return container_of(inode, struct ext4_inode_info, vfs_inode); 1037 } 1038 1039 static inline struct timespec ext4_current_time(struct inode *inode) 1040 { 1041 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1042 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1043 } 1044 1045 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1046 { 1047 return ino == EXT4_ROOT_INO || 1048 ino == EXT4_JOURNAL_INO || 1049 ino == EXT4_RESIZE_INO || 1050 (ino >= EXT4_FIRST_INO(sb) && 1051 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1052 } 1053 1054 /* 1055 * Inode dynamic state flags 1056 */ 1057 enum { 1058 EXT4_STATE_JDATA, /* journaled data exists */ 1059 EXT4_STATE_NEW, /* inode is newly created */ 1060 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1061 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1062 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1063 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1064 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1065 }; 1066 1067 static inline int ext4_test_inode_state(struct inode *inode, int bit) 1068 { 1069 return test_bit(bit, &EXT4_I(inode)->i_state_flags); 1070 } 1071 1072 static inline void ext4_set_inode_state(struct inode *inode, int bit) 1073 { 1074 set_bit(bit, &EXT4_I(inode)->i_state_flags); 1075 } 1076 1077 static inline void ext4_clear_inode_state(struct inode *inode, int bit) 1078 { 1079 clear_bit(bit, &EXT4_I(inode)->i_state_flags); 1080 } 1081 #else 1082 /* Assume that user mode programs are passing in an ext4fs superblock, not 1083 * a kernel struct super_block. This will allow us to call the feature-test 1084 * macros from user land. */ 1085 #define EXT4_SB(sb) (sb) 1086 #endif 1087 1088 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1089 1090 /* 1091 * Codes for operating systems 1092 */ 1093 #define EXT4_OS_LINUX 0 1094 #define EXT4_OS_HURD 1 1095 #define EXT4_OS_MASIX 2 1096 #define EXT4_OS_FREEBSD 3 1097 #define EXT4_OS_LITES 4 1098 1099 /* 1100 * Revision levels 1101 */ 1102 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1103 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1104 1105 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1106 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1107 1108 #define EXT4_GOOD_OLD_INODE_SIZE 128 1109 1110 /* 1111 * Feature set definitions 1112 */ 1113 1114 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1115 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1116 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1117 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1118 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1119 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1120 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1121 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1122 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1123 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1124 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1125 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1126 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1127 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1128 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1129 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1130 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1131 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1132 1133 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1134 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1135 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1136 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1137 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1138 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1139 1140 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1141 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1142 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1143 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1144 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1145 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1146 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1147 1148 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1149 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1150 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1151 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1152 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1153 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1154 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1155 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1156 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1157 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1158 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1159 1160 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1161 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1162 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1163 EXT4_FEATURE_INCOMPAT_META_BG| \ 1164 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1165 EXT4_FEATURE_INCOMPAT_64BIT| \ 1166 EXT4_FEATURE_INCOMPAT_FLEX_BG) 1167 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1168 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1169 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1170 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1171 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1172 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1173 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1174 1175 /* 1176 * Default values for user and/or group using reserved blocks 1177 */ 1178 #define EXT4_DEF_RESUID 0 1179 #define EXT4_DEF_RESGID 0 1180 1181 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1182 1183 /* 1184 * Default mount options 1185 */ 1186 #define EXT4_DEFM_DEBUG 0x0001 1187 #define EXT4_DEFM_BSDGROUPS 0x0002 1188 #define EXT4_DEFM_XATTR_USER 0x0004 1189 #define EXT4_DEFM_ACL 0x0008 1190 #define EXT4_DEFM_UID16 0x0010 1191 #define EXT4_DEFM_JMODE 0x0060 1192 #define EXT4_DEFM_JMODE_DATA 0x0020 1193 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1194 #define EXT4_DEFM_JMODE_WBACK 0x0060 1195 1196 /* 1197 * Default journal batch times 1198 */ 1199 #define EXT4_DEF_MIN_BATCH_TIME 0 1200 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1201 1202 /* 1203 * Minimum number of groups in a flexgroup before we separate out 1204 * directories into the first block group of a flexgroup 1205 */ 1206 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1207 1208 /* 1209 * Structure of a directory entry 1210 */ 1211 #define EXT4_NAME_LEN 255 1212 1213 struct ext4_dir_entry { 1214 __le32 inode; /* Inode number */ 1215 __le16 rec_len; /* Directory entry length */ 1216 __le16 name_len; /* Name length */ 1217 char name[EXT4_NAME_LEN]; /* File name */ 1218 }; 1219 1220 /* 1221 * The new version of the directory entry. Since EXT4 structures are 1222 * stored in intel byte order, and the name_len field could never be 1223 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1224 * file_type field. 1225 */ 1226 struct ext4_dir_entry_2 { 1227 __le32 inode; /* Inode number */ 1228 __le16 rec_len; /* Directory entry length */ 1229 __u8 name_len; /* Name length */ 1230 __u8 file_type; 1231 char name[EXT4_NAME_LEN]; /* File name */ 1232 }; 1233 1234 /* 1235 * Ext4 directory file types. Only the low 3 bits are used. The 1236 * other bits are reserved for now. 1237 */ 1238 #define EXT4_FT_UNKNOWN 0 1239 #define EXT4_FT_REG_FILE 1 1240 #define EXT4_FT_DIR 2 1241 #define EXT4_FT_CHRDEV 3 1242 #define EXT4_FT_BLKDEV 4 1243 #define EXT4_FT_FIFO 5 1244 #define EXT4_FT_SOCK 6 1245 #define EXT4_FT_SYMLINK 7 1246 1247 #define EXT4_FT_MAX 8 1248 1249 /* 1250 * EXT4_DIR_PAD defines the directory entries boundaries 1251 * 1252 * NOTE: It must be a multiple of 4 1253 */ 1254 #define EXT4_DIR_PAD 4 1255 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1256 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1257 ~EXT4_DIR_ROUND) 1258 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1259 1260 /* 1261 * Hash Tree Directory indexing 1262 * (c) Daniel Phillips, 2001 1263 */ 1264 1265 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1266 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1267 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 1268 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1269 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1270 1271 /* Legal values for the dx_root hash_version field: */ 1272 1273 #define DX_HASH_LEGACY 0 1274 #define DX_HASH_HALF_MD4 1 1275 #define DX_HASH_TEA 2 1276 #define DX_HASH_LEGACY_UNSIGNED 3 1277 #define DX_HASH_HALF_MD4_UNSIGNED 4 1278 #define DX_HASH_TEA_UNSIGNED 5 1279 1280 #ifdef __KERNEL__ 1281 1282 /* hash info structure used by the directory hash */ 1283 struct dx_hash_info 1284 { 1285 u32 hash; 1286 u32 minor_hash; 1287 int hash_version; 1288 u32 *seed; 1289 }; 1290 1291 #define EXT4_HTREE_EOF 0x7fffffff 1292 1293 /* 1294 * Control parameters used by ext4_htree_next_block 1295 */ 1296 #define HASH_NB_ALWAYS 1 1297 1298 1299 /* 1300 * Describe an inode's exact location on disk and in memory 1301 */ 1302 struct ext4_iloc 1303 { 1304 struct buffer_head *bh; 1305 unsigned long offset; 1306 ext4_group_t block_group; 1307 }; 1308 1309 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1310 { 1311 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1312 } 1313 1314 /* 1315 * This structure is stuffed into the struct file's private_data field 1316 * for directories. It is where we put information so that we can do 1317 * readdir operations in hash tree order. 1318 */ 1319 struct dir_private_info { 1320 struct rb_root root; 1321 struct rb_node *curr_node; 1322 struct fname *extra_fname; 1323 loff_t last_pos; 1324 __u32 curr_hash; 1325 __u32 curr_minor_hash; 1326 __u32 next_hash; 1327 }; 1328 1329 /* calculate the first block number of the group */ 1330 static inline ext4_fsblk_t 1331 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1332 { 1333 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1334 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1335 } 1336 1337 /* 1338 * Special error return code only used by dx_probe() and its callers. 1339 */ 1340 #define ERR_BAD_DX_DIR -75000 1341 1342 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1343 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1344 1345 extern struct proc_dir_entry *ext4_proc_root; 1346 1347 /* 1348 * Function prototypes 1349 */ 1350 1351 /* 1352 * Ok, these declarations are also in <linux/kernel.h> but none of the 1353 * ext4 source programs needs to include it so they are duplicated here. 1354 */ 1355 # define NORET_TYPE /**/ 1356 # define ATTRIB_NORET __attribute__((noreturn)) 1357 # define NORET_AND noreturn, 1358 1359 /* bitmap.c */ 1360 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1361 1362 /* balloc.c */ 1363 extern unsigned int ext4_block_group(struct super_block *sb, 1364 ext4_fsblk_t blocknr); 1365 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1366 ext4_fsblk_t blocknr); 1367 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1368 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1369 ext4_group_t group); 1370 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1371 ext4_fsblk_t goal, unsigned long *count, int *errp); 1372 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1373 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1374 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1375 ext4_fsblk_t block, unsigned long count); 1376 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1377 extern void ext4_check_blocks_bitmap(struct super_block *); 1378 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1379 ext4_group_t block_group, 1380 struct buffer_head ** bh); 1381 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1382 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1383 ext4_group_t block_group); 1384 extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1385 struct buffer_head *bh, 1386 ext4_group_t group, 1387 struct ext4_group_desc *desc); 1388 #define ext4_free_blocks_after_init(sb, group, desc) \ 1389 ext4_init_block_bitmap(sb, NULL, group, desc) 1390 1391 /* dir.c */ 1392 extern int ext4_check_dir_entry(const char *, struct inode *, 1393 struct ext4_dir_entry_2 *, 1394 struct buffer_head *, unsigned int); 1395 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1396 __u32 minor_hash, 1397 struct ext4_dir_entry_2 *dirent); 1398 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1399 1400 /* fsync.c */ 1401 extern int ext4_sync_file(struct file *, struct dentry *, int); 1402 1403 /* hash.c */ 1404 extern int ext4fs_dirhash(const char *name, int len, struct 1405 dx_hash_info *hinfo); 1406 1407 /* ialloc.c */ 1408 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 1409 const struct qstr *qstr, __u32 goal); 1410 extern void ext4_free_inode(handle_t *, struct inode *); 1411 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1412 extern unsigned long ext4_count_free_inodes(struct super_block *); 1413 extern unsigned long ext4_count_dirs(struct super_block *); 1414 extern void ext4_check_inodes_bitmap(struct super_block *); 1415 extern unsigned ext4_init_inode_bitmap(struct super_block *sb, 1416 struct buffer_head *bh, 1417 ext4_group_t group, 1418 struct ext4_group_desc *desc); 1419 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1420 1421 /* mballoc.c */ 1422 extern long ext4_mb_stats; 1423 extern long ext4_mb_max_to_scan; 1424 extern int ext4_mb_init(struct super_block *, int); 1425 extern int ext4_mb_release(struct super_block *); 1426 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1427 struct ext4_allocation_request *, int *); 1428 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1429 extern void ext4_discard_preallocations(struct inode *); 1430 extern int __init init_ext4_mballoc(void); 1431 extern void exit_ext4_mballoc(void); 1432 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1433 struct buffer_head *bh, ext4_fsblk_t block, 1434 unsigned long count, int flags); 1435 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1436 ext4_group_t i, struct ext4_group_desc *desc); 1437 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1438 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1439 ext4_group_t, int); 1440 /* inode.c */ 1441 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1442 ext4_lblk_t, int, int *); 1443 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1444 ext4_lblk_t, int, int *); 1445 int ext4_get_block(struct inode *inode, sector_t iblock, 1446 struct buffer_head *bh_result, int create); 1447 1448 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1449 extern int ext4_write_inode(struct inode *, struct writeback_control *); 1450 extern int ext4_setattr(struct dentry *, struct iattr *); 1451 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1452 struct kstat *stat); 1453 extern void ext4_delete_inode(struct inode *); 1454 extern int ext4_sync_inode(handle_t *, struct inode *); 1455 extern void ext4_dirty_inode(struct inode *); 1456 extern int ext4_change_inode_journal_flag(struct inode *, int); 1457 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1458 extern int ext4_can_truncate(struct inode *inode); 1459 extern void ext4_truncate(struct inode *); 1460 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1461 extern void ext4_set_inode_flags(struct inode *); 1462 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1463 extern int ext4_alloc_da_blocks(struct inode *inode); 1464 extern void ext4_set_aops(struct inode *inode); 1465 extern int ext4_writepage_trans_blocks(struct inode *); 1466 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1467 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1468 extern int ext4_block_truncate_page(handle_t *handle, 1469 struct address_space *mapping, loff_t from); 1470 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1471 extern qsize_t *ext4_get_reserved_space(struct inode *inode); 1472 extern int flush_completed_IO(struct inode *inode); 1473 extern void ext4_da_update_reserve_space(struct inode *inode, 1474 int used, int quota_claim); 1475 /* ioctl.c */ 1476 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1477 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1478 1479 /* migrate.c */ 1480 extern int ext4_ext_migrate(struct inode *); 1481 1482 /* namei.c */ 1483 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 1484 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 1485 extern int ext4_orphan_add(handle_t *, struct inode *); 1486 extern int ext4_orphan_del(handle_t *, struct inode *); 1487 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1488 __u32 start_minor_hash, __u32 *next_hash); 1489 1490 /* resize.c */ 1491 extern int ext4_group_add(struct super_block *sb, 1492 struct ext4_new_group_data *input); 1493 extern int ext4_group_extend(struct super_block *sb, 1494 struct ext4_super_block *es, 1495 ext4_fsblk_t n_blocks_count); 1496 1497 /* super.c */ 1498 extern void __ext4_error(struct super_block *, const char *, const char *, ...) 1499 __attribute__ ((format (printf, 3, 4))); 1500 #define ext4_error(sb, message...) __ext4_error(sb, __func__, ## message) 1501 extern void ext4_error_inode(const char *, struct inode *, const char *, ...) 1502 __attribute__ ((format (printf, 3, 4))); 1503 extern void ext4_error_file(const char *, struct file *, const char *, ...) 1504 __attribute__ ((format (printf, 3, 4))); 1505 extern void __ext4_std_error(struct super_block *, const char *, int); 1506 extern void ext4_abort(struct super_block *, const char *, const char *, ...) 1507 __attribute__ ((format (printf, 3, 4))); 1508 extern void __ext4_warning(struct super_block *, const char *, 1509 const char *, ...) 1510 __attribute__ ((format (printf, 3, 4))); 1511 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, ## message) 1512 extern void ext4_msg(struct super_block *, const char *, const char *, ...) 1513 __attribute__ ((format (printf, 3, 4))); 1514 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 1515 const char *, const char *, ...) 1516 __attribute__ ((format (printf, 4, 5))); 1517 extern void ext4_update_dynamic_rev(struct super_block *sb); 1518 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1519 __u32 compat); 1520 extern int ext4_update_rocompat_feature(handle_t *handle, 1521 struct super_block *sb, __u32 rocompat); 1522 extern int ext4_update_incompat_feature(handle_t *handle, 1523 struct super_block *sb, __u32 incompat); 1524 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1525 struct ext4_group_desc *bg); 1526 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1527 struct ext4_group_desc *bg); 1528 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1529 struct ext4_group_desc *bg); 1530 extern __u32 ext4_free_blks_count(struct super_block *sb, 1531 struct ext4_group_desc *bg); 1532 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1533 struct ext4_group_desc *bg); 1534 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1535 struct ext4_group_desc *bg); 1536 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1537 struct ext4_group_desc *bg); 1538 extern void ext4_block_bitmap_set(struct super_block *sb, 1539 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1540 extern void ext4_inode_bitmap_set(struct super_block *sb, 1541 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1542 extern void ext4_inode_table_set(struct super_block *sb, 1543 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1544 extern void ext4_free_blks_set(struct super_block *sb, 1545 struct ext4_group_desc *bg, __u32 count); 1546 extern void ext4_free_inodes_set(struct super_block *sb, 1547 struct ext4_group_desc *bg, __u32 count); 1548 extern void ext4_used_dirs_set(struct super_block *sb, 1549 struct ext4_group_desc *bg, __u32 count); 1550 extern void ext4_itable_unused_set(struct super_block *sb, 1551 struct ext4_group_desc *bg, __u32 count); 1552 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1553 struct ext4_group_desc *gdp); 1554 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1555 struct ext4_group_desc *gdp); 1556 1557 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1558 { 1559 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1560 le32_to_cpu(es->s_blocks_count_lo); 1561 } 1562 1563 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1564 { 1565 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1566 le32_to_cpu(es->s_r_blocks_count_lo); 1567 } 1568 1569 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1570 { 1571 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1572 le32_to_cpu(es->s_free_blocks_count_lo); 1573 } 1574 1575 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1576 ext4_fsblk_t blk) 1577 { 1578 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1579 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1580 } 1581 1582 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1583 ext4_fsblk_t blk) 1584 { 1585 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1586 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1587 } 1588 1589 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1590 ext4_fsblk_t blk) 1591 { 1592 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1593 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1594 } 1595 1596 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1597 { 1598 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1599 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1600 le32_to_cpu(raw_inode->i_size_lo); 1601 else 1602 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1603 } 1604 1605 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1606 { 1607 raw_inode->i_size_lo = cpu_to_le32(i_size); 1608 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1609 } 1610 1611 static inline 1612 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1613 ext4_group_t group) 1614 { 1615 struct ext4_group_info ***grp_info; 1616 long indexv, indexh; 1617 grp_info = EXT4_SB(sb)->s_group_info; 1618 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1619 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1620 return grp_info[indexv][indexh]; 1621 } 1622 1623 /* 1624 * Reading s_groups_count requires using smp_rmb() afterwards. See 1625 * the locking protocol documented in the comments of ext4_group_add() 1626 * in resize.c 1627 */ 1628 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1629 { 1630 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1631 1632 smp_rmb(); 1633 return ngroups; 1634 } 1635 1636 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1637 ext4_group_t block_group) 1638 { 1639 return block_group >> sbi->s_log_groups_per_flex; 1640 } 1641 1642 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1643 { 1644 return 1 << sbi->s_log_groups_per_flex; 1645 } 1646 1647 #define ext4_std_error(sb, errno) \ 1648 do { \ 1649 if ((errno)) \ 1650 __ext4_std_error((sb), __func__, (errno)); \ 1651 } while (0) 1652 1653 #ifdef CONFIG_SMP 1654 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1655 * counters. So we need to make sure we have free blocks more 1656 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1657 */ 1658 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1659 #else 1660 #define EXT4_FREEBLOCKS_WATERMARK 0 1661 #endif 1662 1663 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1664 { 1665 /* 1666 * XXX: replace with spinlock if seen contended -bzzz 1667 */ 1668 down_write(&EXT4_I(inode)->i_data_sem); 1669 if (newsize > EXT4_I(inode)->i_disksize) 1670 EXT4_I(inode)->i_disksize = newsize; 1671 up_write(&EXT4_I(inode)->i_data_sem); 1672 return ; 1673 } 1674 1675 struct ext4_group_info { 1676 unsigned long bb_state; 1677 struct rb_root bb_free_root; 1678 ext4_grpblk_t bb_first_free; /* first free block */ 1679 ext4_grpblk_t bb_free; /* total free blocks */ 1680 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 1681 struct list_head bb_prealloc_list; 1682 #ifdef DOUBLE_CHECK 1683 void *bb_bitmap; 1684 #endif 1685 struct rw_semaphore alloc_sem; 1686 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 1687 * regions, index is order. 1688 * bb_counters[3] = 5 means 1689 * 5 free 8-block regions. */ 1690 }; 1691 1692 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1693 1694 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1695 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1696 1697 #define EXT4_MAX_CONTENTION 8 1698 #define EXT4_CONTENTION_THRESHOLD 2 1699 1700 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 1701 ext4_group_t group) 1702 { 1703 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 1704 } 1705 1706 /* 1707 * Returns true if the filesystem is busy enough that attempts to 1708 * access the block group locks has run into contention. 1709 */ 1710 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 1711 { 1712 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 1713 } 1714 1715 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1716 { 1717 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 1718 if (spin_trylock(lock)) 1719 /* 1720 * We're able to grab the lock right away, so drop the 1721 * lock contention counter. 1722 */ 1723 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 1724 else { 1725 /* 1726 * The lock is busy, so bump the contention counter, 1727 * and then wait on the spin lock. 1728 */ 1729 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 1730 EXT4_MAX_CONTENTION); 1731 spin_lock(lock); 1732 } 1733 } 1734 1735 static inline void ext4_unlock_group(struct super_block *sb, 1736 ext4_group_t group) 1737 { 1738 spin_unlock(ext4_group_lock_ptr(sb, group)); 1739 } 1740 1741 /* 1742 * Inodes and files operations 1743 */ 1744 1745 /* dir.c */ 1746 extern const struct file_operations ext4_dir_operations; 1747 1748 /* file.c */ 1749 extern const struct inode_operations ext4_file_inode_operations; 1750 extern const struct file_operations ext4_file_operations; 1751 1752 /* namei.c */ 1753 extern const struct inode_operations ext4_dir_inode_operations; 1754 extern const struct inode_operations ext4_special_inode_operations; 1755 extern struct dentry *ext4_get_parent(struct dentry *child); 1756 1757 /* symlink.c */ 1758 extern const struct inode_operations ext4_symlink_inode_operations; 1759 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1760 1761 /* block_validity */ 1762 extern void ext4_release_system_zone(struct super_block *sb); 1763 extern int ext4_setup_system_zone(struct super_block *sb); 1764 extern int __init init_ext4_system_zone(void); 1765 extern void exit_ext4_system_zone(void); 1766 extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 1767 ext4_fsblk_t start_blk, 1768 unsigned int count); 1769 1770 /* extents.c */ 1771 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1772 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1773 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1774 int chunk); 1775 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1776 ext4_lblk_t iblock, unsigned int max_blocks, 1777 struct buffer_head *bh_result, int flags); 1778 extern void ext4_ext_truncate(struct inode *); 1779 extern void ext4_ext_init(struct super_block *); 1780 extern void ext4_ext_release(struct super_block *); 1781 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1782 loff_t len); 1783 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 1784 ssize_t len); 1785 extern int ext4_get_blocks(handle_t *handle, struct inode *inode, 1786 sector_t block, unsigned int max_blocks, 1787 struct buffer_head *bh, int flags); 1788 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1789 __u64 start, __u64 len); 1790 /* move_extent.c */ 1791 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 1792 __u64 start_orig, __u64 start_donor, 1793 __u64 len, __u64 *moved_len); 1794 1795 1796 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 1797 enum ext4_state_bits { 1798 BH_Uninit /* blocks are allocated but uninitialized on disk */ 1799 = BH_JBDPrivateStart, 1800 }; 1801 1802 BUFFER_FNS(Uninit, uninit) 1803 TAS_BUFFER_FNS(Uninit, uninit) 1804 1805 /* 1806 * Add new method to test wether block and inode bitmaps are properly 1807 * initialized. With uninit_bg reading the block from disk is not enough 1808 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1809 */ 1810 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1811 1812 static inline int bitmap_uptodate(struct buffer_head *bh) 1813 { 1814 return (buffer_uptodate(bh) && 1815 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1816 } 1817 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1818 { 1819 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1820 } 1821 1822 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 1823 1824 #endif /* __KERNEL__ */ 1825 1826 #endif /* _EXT4_H */ 1827