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#ifdef __KERNEL__ 33#include <linux/compat.h> 34#endif 35 36/* 37 * The fourth extended filesystem constants/structures 38 */ 39 40/* 41 * Define EXT4FS_DEBUG to produce debug messages 42 */ 43#undef EXT4FS_DEBUG 44 45/* 46 * Debug code 47 */ 48#ifdef EXT4FS_DEBUG 49#define ext4_debug(f, a...) \ 50 do { \ 51 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 52 __FILE__, __LINE__, __func__); \ 53 printk(KERN_DEBUG f, ## a); \ 54 } while (0) 55#else 56#define ext4_debug(f, a...) do {} while (0) 57#endif 58 59#define EXT4_ERROR_INODE(inode, fmt, a...) \ 60 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a) 61 62#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \ 63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a) 64 65#define EXT4_ERROR_FILE(file, fmt, a...) \ 66 ext4_error_file(__func__, __LINE__, (file), (fmt), ## a) 67 68/* data type for block offset of block group */ 69typedef int ext4_grpblk_t; 70 71/* data type for filesystem-wide blocks number */ 72typedef unsigned long long ext4_fsblk_t; 73 74/* data type for file logical block number */ 75typedef __u32 ext4_lblk_t; 76 77/* data type for block group number */ 78typedef unsigned int ext4_group_t; 79 80/* 81 * Flags used in mballoc's allocation_context flags field. 82 * 83 * Also used to show what's going on for debugging purposes when the 84 * flag field is exported via the traceport interface 85 */ 86 87/* prefer goal again. length */ 88#define EXT4_MB_HINT_MERGE 0x0001 89/* blocks already reserved */ 90#define EXT4_MB_HINT_RESERVED 0x0002 91/* metadata is being allocated */ 92#define EXT4_MB_HINT_METADATA 0x0004 93/* first blocks in the file */ 94#define EXT4_MB_HINT_FIRST 0x0008 95/* search for the best chunk */ 96#define EXT4_MB_HINT_BEST 0x0010 97/* data is being allocated */ 98#define EXT4_MB_HINT_DATA 0x0020 99/* don't preallocate (for tails) */ 100#define EXT4_MB_HINT_NOPREALLOC 0x0040 101/* allocate for locality group */ 102#define EXT4_MB_HINT_GROUP_ALLOC 0x0080 103/* allocate goal blocks or none */ 104#define EXT4_MB_HINT_GOAL_ONLY 0x0100 105/* goal is meaningful */ 106#define EXT4_MB_HINT_TRY_GOAL 0x0200 107/* blocks already pre-reserved by delayed allocation */ 108#define EXT4_MB_DELALLOC_RESERVED 0x0400 109/* We are doing stream allocation */ 110#define EXT4_MB_STREAM_ALLOC 0x0800 111 112 113struct ext4_allocation_request { 114 /* target inode for block we're allocating */ 115 struct inode *inode; 116 /* how many blocks we want to allocate */ 117 unsigned int len; 118 /* logical block in target inode */ 119 ext4_lblk_t logical; 120 /* the closest logical allocated block to the left */ 121 ext4_lblk_t lleft; 122 /* the closest logical allocated block to the right */ 123 ext4_lblk_t lright; 124 /* phys. target (a hint) */ 125 ext4_fsblk_t goal; 126 /* phys. block for the closest logical allocated block to the left */ 127 ext4_fsblk_t pleft; 128 /* phys. block for the closest logical allocated block to the right */ 129 ext4_fsblk_t pright; 130 /* flags. see above EXT4_MB_HINT_* */ 131 unsigned int flags; 132}; 133 134/* 135 * Logical to physical block mapping, used by ext4_map_blocks() 136 * 137 * This structure is used to pass requests into ext4_map_blocks() as 138 * well as to store the information returned by ext4_map_blocks(). It 139 * takes less room on the stack than a struct buffer_head. 140 */ 141#define EXT4_MAP_NEW (1 << BH_New) 142#define EXT4_MAP_MAPPED (1 << BH_Mapped) 143#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten) 144#define EXT4_MAP_BOUNDARY (1 << BH_Boundary) 145#define EXT4_MAP_UNINIT (1 << BH_Uninit) 146#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\ 147 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\ 148 EXT4_MAP_UNINIT) 149 150struct ext4_map_blocks { 151 ext4_fsblk_t m_pblk; 152 ext4_lblk_t m_lblk; 153 unsigned int m_len; 154 unsigned int m_flags; 155}; 156 157/* 158 * For delayed allocation tracking 159 */ 160struct mpage_da_data { 161 struct inode *inode; 162 sector_t b_blocknr; /* start block number of extent */ 163 size_t b_size; /* size of extent */ 164 unsigned long b_state; /* state of the extent */ 165 unsigned long first_page, next_page; /* extent of pages */ 166 struct writeback_control *wbc; 167 int io_done; 168 int pages_written; 169 int retval; 170}; 171#define EXT4_IO_UNWRITTEN 0x1 172typedef struct ext4_io_end { 173 struct list_head list; /* per-file finished IO list */ 174 struct inode *inode; /* file being written to */ 175 unsigned int flag; /* unwritten or not */ 176 struct page *page; /* page struct for buffer write */ 177 loff_t offset; /* offset in the file */ 178 ssize_t size; /* size of the extent */ 179 struct work_struct work; /* data work queue */ 180 struct kiocb *iocb; /* iocb struct for AIO */ 181 int result; /* error value for AIO */ 182} ext4_io_end_t; 183 184/* 185 * Special inodes numbers 186 */ 187#define EXT4_BAD_INO 1 /* Bad blocks inode */ 188#define EXT4_ROOT_INO 2 /* Root inode */ 189#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 190#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 191#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 192#define EXT4_JOURNAL_INO 8 /* Journal inode */ 193 194/* First non-reserved inode for old ext4 filesystems */ 195#define EXT4_GOOD_OLD_FIRST_INO 11 196 197/* 198 * Maximal count of links to a file 199 */ 200#define EXT4_LINK_MAX 65000 201 202/* 203 * Macro-instructions used to manage several block sizes 204 */ 205#define EXT4_MIN_BLOCK_SIZE 1024 206#define EXT4_MAX_BLOCK_SIZE 65536 207#define EXT4_MIN_BLOCK_LOG_SIZE 10 208#ifdef __KERNEL__ 209# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 210#else 211# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 212#endif 213#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 214#ifdef __KERNEL__ 215# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 216#else 217# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 218#endif 219#ifdef __KERNEL__ 220#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 221#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 222#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 223#else 224#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 225 EXT4_GOOD_OLD_INODE_SIZE : \ 226 (s)->s_inode_size) 227#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 228 EXT4_GOOD_OLD_FIRST_INO : \ 229 (s)->s_first_ino) 230#endif 231#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 232 233/* 234 * Structure of a blocks group descriptor 235 */ 236struct ext4_group_desc 237{ 238 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 239 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 240 __le32 bg_inode_table_lo; /* Inodes table block */ 241 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 242 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 243 __le16 bg_used_dirs_count_lo; /* Directories count */ 244 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 245 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 246 __le16 bg_itable_unused_lo; /* Unused inodes count */ 247 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 248 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 249 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 250 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 251 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 252 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 253 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 254 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 255 __u32 bg_reserved2[3]; 256}; 257 258/* 259 * Structure of a flex block group info 260 */ 261 262struct flex_groups { 263 atomic_t free_inodes; 264 atomic_t free_blocks; 265 atomic_t used_dirs; 266}; 267 268#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 269#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 270#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 271 272/* 273 * Macro-instructions used to manage group descriptors 274 */ 275#define EXT4_MIN_DESC_SIZE 32 276#define EXT4_MIN_DESC_SIZE_64BIT 64 277#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 278#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 279#ifdef __KERNEL__ 280# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 281# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 282# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 283# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 284#else 285# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 286# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 287# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 288#endif 289 290/* 291 * Constants relative to the data blocks 292 */ 293#define EXT4_NDIR_BLOCKS 12 294#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 295#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 296#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 297#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 298 299/* 300 * Inode flags 301 */ 302#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 303#define EXT4_UNRM_FL 0x00000002 /* Undelete */ 304#define EXT4_COMPR_FL 0x00000004 /* Compress file */ 305#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 306#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 307#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 308#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 309#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 310/* Reserved for compression usage... */ 311#define EXT4_DIRTY_FL 0x00000100 312#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 313#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 314#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 315/* End compression flags --- maybe not all used */ 316#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 317#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 318#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 319#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 320#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 321#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 322#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 323#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 324#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */ 325#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */ 326#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 327 328#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */ 329#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */ 330 331/* Flags that should be inherited by new inodes from their parent. */ 332#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 333 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 334 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 335 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 336 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 337 338/* Flags that are appropriate for regular files (all but dir-specific ones). */ 339#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 340 341/* Flags that are appropriate for non-directories/regular files. */ 342#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 343 344/* Mask out flags that are inappropriate for the given type of inode. */ 345static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 346{ 347 if (S_ISDIR(mode)) 348 return flags; 349 else if (S_ISREG(mode)) 350 return flags & EXT4_REG_FLMASK; 351 else 352 return flags & EXT4_OTHER_FLMASK; 353} 354 355/* 356 * Inode flags used for atomic set/get 357 */ 358enum { 359 EXT4_INODE_SECRM = 0, /* Secure deletion */ 360 EXT4_INODE_UNRM = 1, /* Undelete */ 361 EXT4_INODE_COMPR = 2, /* Compress file */ 362 EXT4_INODE_SYNC = 3, /* Synchronous updates */ 363 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */ 364 EXT4_INODE_APPEND = 5, /* writes to file may only append */ 365 EXT4_INODE_NODUMP = 6, /* do not dump file */ 366 EXT4_INODE_NOATIME = 7, /* do not update atime */ 367/* Reserved for compression usage... */ 368 EXT4_INODE_DIRTY = 8, 369 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */ 370 EXT4_INODE_NOCOMPR = 10, /* Don't compress */ 371 EXT4_INODE_ECOMPR = 11, /* Compression error */ 372/* End compression flags --- maybe not all used */ 373 EXT4_INODE_INDEX = 12, /* hash-indexed directory */ 374 EXT4_INODE_IMAGIC = 13, /* AFS directory */ 375 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */ 376 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */ 377 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */ 378 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/ 379 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */ 380 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */ 381 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */ 382 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */ 383 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */ 384}; 385 386#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG)) 387#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \ 388 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \ 389 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); } 390 391/* 392 * Since it's pretty easy to mix up bit numbers and hex values, and we 393 * can't do a compile-time test for ENUM values, we use a run-time 394 * test to make sure that EXT4_XXX_FL is consistent with respect to 395 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop 396 * out so it won't cost any extra space in the compiled kernel image. 397 * But it's important that these values are the same, since we are 398 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL 399 * must be consistent with the values of FS_XXX_FL defined in 400 * include/linux/fs.h and the on-disk values found in ext2, ext3, and 401 * ext4 filesystems, and of course the values defined in e2fsprogs. 402 * 403 * It's not paranoia if the Murphy's Law really *is* out to get you. :-) 404 */ 405static inline void ext4_check_flag_values(void) 406{ 407 CHECK_FLAG_VALUE(SECRM); 408 CHECK_FLAG_VALUE(UNRM); 409 CHECK_FLAG_VALUE(COMPR); 410 CHECK_FLAG_VALUE(SYNC); 411 CHECK_FLAG_VALUE(IMMUTABLE); 412 CHECK_FLAG_VALUE(APPEND); 413 CHECK_FLAG_VALUE(NODUMP); 414 CHECK_FLAG_VALUE(NOATIME); 415 CHECK_FLAG_VALUE(DIRTY); 416 CHECK_FLAG_VALUE(COMPRBLK); 417 CHECK_FLAG_VALUE(NOCOMPR); 418 CHECK_FLAG_VALUE(ECOMPR); 419 CHECK_FLAG_VALUE(INDEX); 420 CHECK_FLAG_VALUE(IMAGIC); 421 CHECK_FLAG_VALUE(JOURNAL_DATA); 422 CHECK_FLAG_VALUE(NOTAIL); 423 CHECK_FLAG_VALUE(DIRSYNC); 424 CHECK_FLAG_VALUE(TOPDIR); 425 CHECK_FLAG_VALUE(HUGE_FILE); 426 CHECK_FLAG_VALUE(EXTENTS); 427 CHECK_FLAG_VALUE(EA_INODE); 428 CHECK_FLAG_VALUE(EOFBLOCKS); 429 CHECK_FLAG_VALUE(RESERVED); 430} 431 432/* Used to pass group descriptor data when online resize is done */ 433struct ext4_new_group_input { 434 __u32 group; /* Group number for this data */ 435 __u64 block_bitmap; /* Absolute block number of block bitmap */ 436 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 437 __u64 inode_table; /* Absolute block number of inode table start */ 438 __u32 blocks_count; /* Total number of blocks in this group */ 439 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 440 __u16 unused; 441}; 442 443#if defined(__KERNEL__) && defined(CONFIG_COMPAT) 444struct compat_ext4_new_group_input { 445 u32 group; 446 compat_u64 block_bitmap; 447 compat_u64 inode_bitmap; 448 compat_u64 inode_table; 449 u32 blocks_count; 450 u16 reserved_blocks; 451 u16 unused; 452}; 453#endif 454 455/* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 456struct ext4_new_group_data { 457 __u32 group; 458 __u64 block_bitmap; 459 __u64 inode_bitmap; 460 __u64 inode_table; 461 __u32 blocks_count; 462 __u16 reserved_blocks; 463 __u16 unused; 464 __u32 free_blocks_count; 465}; 466 467/* 468 * Flags used by ext4_map_blocks() 469 */ 470 /* Allocate any needed blocks and/or convert an unitialized 471 extent to be an initialized ext4 */ 472#define EXT4_GET_BLOCKS_CREATE 0x0001 473 /* Request the creation of an unitialized extent */ 474#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002 475#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\ 476 EXT4_GET_BLOCKS_CREATE) 477 /* Caller is from the delayed allocation writeout path, 478 so set the magic i_delalloc_reserve_flag after taking the 479 inode allocation semaphore for */ 480#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004 481 /* caller is from the direct IO path, request to creation of an 482 unitialized extents if not allocated, split the uninitialized 483 extent if blocks has been preallocated already*/ 484#define EXT4_GET_BLOCKS_PRE_IO 0x0008 485#define EXT4_GET_BLOCKS_CONVERT 0x0010 486#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\ 487 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 488 /* Convert extent to initialized after IO complete */ 489#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\ 490 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT) 491 492/* 493 * Flags used by ext4_free_blocks 494 */ 495#define EXT4_FREE_BLOCKS_METADATA 0x0001 496#define EXT4_FREE_BLOCKS_FORGET 0x0002 497#define EXT4_FREE_BLOCKS_VALIDATED 0x0004 498 499/* 500 * ioctl commands 501 */ 502#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 503#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 504#define EXT4_IOC_GETVERSION _IOR('f', 3, long) 505#define EXT4_IOC_SETVERSION _IOW('f', 4, long) 506#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 507#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 508#ifdef CONFIG_JBD2_DEBUG 509#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 510#endif 511#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 512#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 513#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 514#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 515#define EXT4_IOC_MIGRATE _IO('f', 9) 516 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 517 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 518#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 519#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) 520 521#if defined(__KERNEL__) && defined(CONFIG_COMPAT) 522/* 523 * ioctl commands in 32 bit emulation 524 */ 525#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 526#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 527#define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 528#define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 529#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 530#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 531#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 532#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input) 533#ifdef CONFIG_JBD2_DEBUG 534#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 535#endif 536#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 537#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 538#endif 539 540 541/* 542 * Mount options 543 */ 544struct ext4_mount_options { 545 unsigned long s_mount_opt; 546 uid_t s_resuid; 547 gid_t s_resgid; 548 unsigned long s_commit_interval; 549 u32 s_min_batch_time, s_max_batch_time; 550#ifdef CONFIG_QUOTA 551 int s_jquota_fmt; 552 char *s_qf_names[MAXQUOTAS]; 553#endif 554}; 555 556/* Max physical block we can addres w/o extents */ 557#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF 558 559/* 560 * Structure of an inode on the disk 561 */ 562struct ext4_inode { 563 __le16 i_mode; /* File mode */ 564 __le16 i_uid; /* Low 16 bits of Owner Uid */ 565 __le32 i_size_lo; /* Size in bytes */ 566 __le32 i_atime; /* Access time */ 567 __le32 i_ctime; /* Inode Change time */ 568 __le32 i_mtime; /* Modification time */ 569 __le32 i_dtime; /* Deletion Time */ 570 __le16 i_gid; /* Low 16 bits of Group Id */ 571 __le16 i_links_count; /* Links count */ 572 __le32 i_blocks_lo; /* Blocks count */ 573 __le32 i_flags; /* File flags */ 574 union { 575 struct { 576 __le32 l_i_version; 577 } linux1; 578 struct { 579 __u32 h_i_translator; 580 } hurd1; 581 struct { 582 __u32 m_i_reserved1; 583 } masix1; 584 } osd1; /* OS dependent 1 */ 585 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 586 __le32 i_generation; /* File version (for NFS) */ 587 __le32 i_file_acl_lo; /* File ACL */ 588 __le32 i_size_high; 589 __le32 i_obso_faddr; /* Obsoleted fragment address */ 590 union { 591 struct { 592 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 593 __le16 l_i_file_acl_high; 594 __le16 l_i_uid_high; /* these 2 fields */ 595 __le16 l_i_gid_high; /* were reserved2[0] */ 596 __u32 l_i_reserved2; 597 } linux2; 598 struct { 599 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 600 __u16 h_i_mode_high; 601 __u16 h_i_uid_high; 602 __u16 h_i_gid_high; 603 __u32 h_i_author; 604 } hurd2; 605 struct { 606 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 607 __le16 m_i_file_acl_high; 608 __u32 m_i_reserved2[2]; 609 } masix2; 610 } osd2; /* OS dependent 2 */ 611 __le16 i_extra_isize; 612 __le16 i_pad1; 613 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 614 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 615 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 616 __le32 i_crtime; /* File Creation time */ 617 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 618 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 619}; 620 621struct move_extent { 622 __u32 reserved; /* should be zero */ 623 __u32 donor_fd; /* donor file descriptor */ 624 __u64 orig_start; /* logical start offset in block for orig */ 625 __u64 donor_start; /* logical start offset in block for donor */ 626 __u64 len; /* block length to be moved */ 627 __u64 moved_len; /* moved block length */ 628}; 629 630#define EXT4_EPOCH_BITS 2 631#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 632#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 633 634/* 635 * Extended fields will fit into an inode if the filesystem was formatted 636 * with large inodes (-I 256 or larger) and there are not currently any EAs 637 * consuming all of the available space. For new inodes we always reserve 638 * enough space for the kernel's known extended fields, but for inodes 639 * created with an old kernel this might not have been the case. None of 640 * the extended inode fields is critical for correct filesystem operation. 641 * This macro checks if a certain field fits in the inode. Note that 642 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 643 */ 644#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 645 ((offsetof(typeof(*ext4_inode), field) + \ 646 sizeof((ext4_inode)->field)) \ 647 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 648 (einode)->i_extra_isize)) \ 649 650static inline __le32 ext4_encode_extra_time(struct timespec *time) 651{ 652 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 653 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) | 654 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK)); 655} 656 657static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 658{ 659 if (sizeof(time->tv_sec) > 4) 660 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 661 << 32; 662 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS; 663} 664 665#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 666do { \ 667 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 668 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 669 (raw_inode)->xtime ## _extra = \ 670 ext4_encode_extra_time(&(inode)->xtime); \ 671} while (0) 672 673#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 674do { \ 675 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 676 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 677 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 678 (raw_inode)->xtime ## _extra = \ 679 ext4_encode_extra_time(&(einode)->xtime); \ 680} while (0) 681 682#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 683do { \ 684 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 685 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 686 ext4_decode_extra_time(&(inode)->xtime, \ 687 raw_inode->xtime ## _extra); \ 688} while (0) 689 690#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 691do { \ 692 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 693 (einode)->xtime.tv_sec = \ 694 (signed)le32_to_cpu((raw_inode)->xtime); \ 695 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 696 ext4_decode_extra_time(&(einode)->xtime, \ 697 raw_inode->xtime ## _extra); \ 698} while (0) 699 700#define i_disk_version osd1.linux1.l_i_version 701 702#if defined(__KERNEL__) || defined(__linux__) 703#define i_reserved1 osd1.linux1.l_i_reserved1 704#define i_file_acl_high osd2.linux2.l_i_file_acl_high 705#define i_blocks_high osd2.linux2.l_i_blocks_high 706#define i_uid_low i_uid 707#define i_gid_low i_gid 708#define i_uid_high osd2.linux2.l_i_uid_high 709#define i_gid_high osd2.linux2.l_i_gid_high 710#define i_reserved2 osd2.linux2.l_i_reserved2 711 712#elif defined(__GNU__) 713 714#define i_translator osd1.hurd1.h_i_translator 715#define i_uid_high osd2.hurd2.h_i_uid_high 716#define i_gid_high osd2.hurd2.h_i_gid_high 717#define i_author osd2.hurd2.h_i_author 718 719#elif defined(__masix__) 720 721#define i_reserved1 osd1.masix1.m_i_reserved1 722#define i_file_acl_high osd2.masix2.m_i_file_acl_high 723#define i_reserved2 osd2.masix2.m_i_reserved2 724 725#endif /* defined(__KERNEL__) || defined(__linux__) */ 726 727/* 728 * storage for cached extent 729 */ 730struct ext4_ext_cache { 731 ext4_fsblk_t ec_start; 732 ext4_lblk_t ec_block; 733 __u32 ec_len; /* must be 32bit to return holes */ 734 __u32 ec_type; 735}; 736 737/* 738 * fourth extended file system inode data in memory 739 */ 740struct ext4_inode_info { 741 __le32 i_data[15]; /* unconverted */ 742 __u32 i_dtime; 743 ext4_fsblk_t i_file_acl; 744 745 /* 746 * i_block_group is the number of the block group which contains 747 * this file's inode. Constant across the lifetime of the inode, 748 * it is ued for making block allocation decisions - we try to 749 * place a file's data blocks near its inode block, and new inodes 750 * near to their parent directory's inode. 751 */ 752 ext4_group_t i_block_group; 753 unsigned long i_state_flags; /* Dynamic state flags */ 754 unsigned long i_flags; 755 756 ext4_lblk_t i_dir_start_lookup; 757#ifdef CONFIG_EXT4_FS_XATTR 758 /* 759 * Extended attributes can be read independently of the main file 760 * data. Taking i_mutex even when reading would cause contention 761 * between readers of EAs and writers of regular file data, so 762 * instead we synchronize on xattr_sem when reading or changing 763 * EAs. 764 */ 765 struct rw_semaphore xattr_sem; 766#endif 767 768 struct list_head i_orphan; /* unlinked but open inodes */ 769 770 /* 771 * i_disksize keeps track of what the inode size is ON DISK, not 772 * in memory. During truncate, i_size is set to the new size by 773 * the VFS prior to calling ext4_truncate(), but the filesystem won't 774 * set i_disksize to 0 until the truncate is actually under way. 775 * 776 * The intent is that i_disksize always represents the blocks which 777 * are used by this file. This allows recovery to restart truncate 778 * on orphans if we crash during truncate. We actually write i_disksize 779 * into the on-disk inode when writing inodes out, instead of i_size. 780 * 781 * The only time when i_disksize and i_size may be different is when 782 * a truncate is in progress. The only things which change i_disksize 783 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 784 */ 785 loff_t i_disksize; 786 787 /* 788 * i_data_sem is for serialising ext4_truncate() against 789 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 790 * data tree are chopped off during truncate. We can't do that in 791 * ext4 because whenever we perform intermediate commits during 792 * truncate, the inode and all the metadata blocks *must* be in a 793 * consistent state which allows truncation of the orphans to restart 794 * during recovery. Hence we must fix the get_block-vs-truncate race 795 * by other means, so we have i_data_sem. 796 */ 797 struct rw_semaphore i_data_sem; 798 struct inode vfs_inode; 799 struct jbd2_inode jinode; 800 801 struct ext4_ext_cache i_cached_extent; 802 /* 803 * File creation time. Its function is same as that of 804 * struct timespec i_{a,c,m}time in the generic inode. 805 */ 806 struct timespec i_crtime; 807 808 /* mballoc */ 809 struct list_head i_prealloc_list; 810 spinlock_t i_prealloc_lock; 811 812 /* ialloc */ 813 ext4_group_t i_last_alloc_group; 814 815 /* allocation reservation info for delalloc */ 816 unsigned int i_reserved_data_blocks; 817 unsigned int i_reserved_meta_blocks; 818 unsigned int i_allocated_meta_blocks; 819 unsigned short i_delalloc_reserved_flag; 820 sector_t i_da_metadata_calc_last_lblock; 821 int i_da_metadata_calc_len; 822 823 /* on-disk additional length */ 824 __u16 i_extra_isize; 825 826 spinlock_t i_block_reservation_lock; 827#ifdef CONFIG_QUOTA 828 /* quota space reservation, managed internally by quota code */ 829 qsize_t i_reserved_quota; 830#endif 831 832 /* completed IOs that might need unwritten extents handling */ 833 struct list_head i_completed_io_list; 834 spinlock_t i_completed_io_lock; 835 /* current io_end structure for async DIO write*/ 836 ext4_io_end_t *cur_aio_dio; 837 838 /* 839 * Transactions that contain inode's metadata needed to complete 840 * fsync and fdatasync, respectively. 841 */ 842 tid_t i_sync_tid; 843 tid_t i_datasync_tid; 844}; 845 846/* 847 * File system states 848 */ 849#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 850#define EXT4_ERROR_FS 0x0002 /* Errors detected */ 851#define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 852 853/* 854 * Misc. filesystem flags 855 */ 856#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 857#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 858#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 859 860/* 861 * Mount flags 862 */ 863#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 864#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 865#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 866#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 867#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 868#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 869#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 870#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 871#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 872#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 873#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 874#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 875#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 876#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 877#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 878#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 879#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 880#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 881#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 882#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 883#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 884#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */ 885#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 886#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 887#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 888#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 889#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 890#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */ 891#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */ 892 893#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 894#define set_opt(o, opt) o |= EXT4_MOUNT_##opt 895#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 896 EXT4_MOUNT_##opt) 897 898#define ext4_set_bit ext2_set_bit 899#define ext4_set_bit_atomic ext2_set_bit_atomic 900#define ext4_clear_bit ext2_clear_bit 901#define ext4_clear_bit_atomic ext2_clear_bit_atomic 902#define ext4_test_bit ext2_test_bit 903#define ext4_find_first_zero_bit ext2_find_first_zero_bit 904#define ext4_find_next_zero_bit ext2_find_next_zero_bit 905#define ext4_find_next_bit ext2_find_next_bit 906 907/* 908 * Maximal mount counts between two filesystem checks 909 */ 910#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 911#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 912 913/* 914 * Behaviour when detecting errors 915 */ 916#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 917#define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 918#define EXT4_ERRORS_PANIC 3 /* Panic */ 919#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 920 921/* 922 * Structure of the super block 923 */ 924struct ext4_super_block { 925/*00*/ __le32 s_inodes_count; /* Inodes count */ 926 __le32 s_blocks_count_lo; /* Blocks count */ 927 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 928 __le32 s_free_blocks_count_lo; /* Free blocks count */ 929/*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 930 __le32 s_first_data_block; /* First Data Block */ 931 __le32 s_log_block_size; /* Block size */ 932 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 933/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 934 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 935 __le32 s_inodes_per_group; /* # Inodes per group */ 936 __le32 s_mtime; /* Mount time */ 937/*30*/ __le32 s_wtime; /* Write time */ 938 __le16 s_mnt_count; /* Mount count */ 939 __le16 s_max_mnt_count; /* Maximal mount count */ 940 __le16 s_magic; /* Magic signature */ 941 __le16 s_state; /* File system state */ 942 __le16 s_errors; /* Behaviour when detecting errors */ 943 __le16 s_minor_rev_level; /* minor revision level */ 944/*40*/ __le32 s_lastcheck; /* time of last check */ 945 __le32 s_checkinterval; /* max. time between checks */ 946 __le32 s_creator_os; /* OS */ 947 __le32 s_rev_level; /* Revision level */ 948/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 949 __le16 s_def_resgid; /* Default gid for reserved blocks */ 950 /* 951 * These fields are for EXT4_DYNAMIC_REV superblocks only. 952 * 953 * Note: the difference between the compatible feature set and 954 * the incompatible feature set is that if there is a bit set 955 * in the incompatible feature set that the kernel doesn't 956 * know about, it should refuse to mount the filesystem. 957 * 958 * e2fsck's requirements are more strict; if it doesn't know 959 * about a feature in either the compatible or incompatible 960 * feature set, it must abort and not try to meddle with 961 * things it doesn't understand... 962 */ 963 __le32 s_first_ino; /* First non-reserved inode */ 964 __le16 s_inode_size; /* size of inode structure */ 965 __le16 s_block_group_nr; /* block group # of this superblock */ 966 __le32 s_feature_compat; /* compatible feature set */ 967/*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 968 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 969/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 970/*78*/ char s_volume_name[16]; /* volume name */ 971/*88*/ char s_last_mounted[64]; /* directory where last mounted */ 972/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 973 /* 974 * Performance hints. Directory preallocation should only 975 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 976 */ 977 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 978 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 979 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 980 /* 981 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 982 */ 983/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 984/*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 985 __le32 s_journal_dev; /* device number of journal file */ 986 __le32 s_last_orphan; /* start of list of inodes to delete */ 987 __le32 s_hash_seed[4]; /* HTREE hash seed */ 988 __u8 s_def_hash_version; /* Default hash version to use */ 989 __u8 s_jnl_backup_type; 990 __le16 s_desc_size; /* size of group descriptor */ 991/*100*/ __le32 s_default_mount_opts; 992 __le32 s_first_meta_bg; /* First metablock block group */ 993 __le32 s_mkfs_time; /* When the filesystem was created */ 994 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 995 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 996/*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 997 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 998 __le32 s_free_blocks_count_hi; /* Free blocks count */ 999 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 1000 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 1001 __le32 s_flags; /* Miscellaneous flags */ 1002 __le16 s_raid_stride; /* RAID stride */ 1003 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 1004 __le64 s_mmp_block; /* Block for multi-mount protection */ 1005 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 1006 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 1007 __u8 s_reserved_char_pad; 1008 __le16 s_reserved_pad; 1009 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 1010 __le32 s_snapshot_inum; /* Inode number of active snapshot */ 1011 __le32 s_snapshot_id; /* sequential ID of active snapshot */ 1012 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active 1013 snapshot's future use */ 1014 __le32 s_snapshot_list; /* inode number of the head of the 1015 on-disk snapshot list */ 1016#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count) 1017 __le32 s_error_count; /* number of fs errors */ 1018 __le32 s_first_error_time; /* first time an error happened */ 1019 __le32 s_first_error_ino; /* inode involved in first error */ 1020 __le64 s_first_error_block; /* block involved of first error */ 1021 __u8 s_first_error_func[32]; /* function where the error happened */ 1022 __le32 s_first_error_line; /* line number where error happened */ 1023 __le32 s_last_error_time; /* most recent time of an error */ 1024 __le32 s_last_error_ino; /* inode involved in last error */ 1025 __le32 s_last_error_line; /* line number where error happened */ 1026 __le64 s_last_error_block; /* block involved of last error */ 1027 __u8 s_last_error_func[32]; /* function where the error happened */ 1028#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts) 1029 __u8 s_mount_opts[64]; 1030 __le32 s_reserved[112]; /* Padding to the end of the block */ 1031}; 1032 1033#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START) 1034 1035#ifdef __KERNEL__ 1036 1037/* 1038 * run-time mount flags 1039 */ 1040#define EXT4_MF_MNTDIR_SAMPLED 0x0001 1041#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */ 1042 1043/* 1044 * fourth extended-fs super-block data in memory 1045 */ 1046struct ext4_sb_info { 1047 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 1048 unsigned long s_inodes_per_block;/* Number of inodes per block */ 1049 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 1050 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 1051 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 1052 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 1053 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 1054 ext4_group_t s_groups_count; /* Number of groups in the fs */ 1055 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */ 1056 unsigned long s_overhead_last; /* Last calculated overhead */ 1057 unsigned long s_blocks_last; /* Last seen block count */ 1058 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 1059 struct buffer_head * s_sbh; /* Buffer containing the super block */ 1060 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 1061 struct buffer_head **s_group_desc; 1062 unsigned int s_mount_opt; 1063 unsigned int s_mount_flags; 1064 ext4_fsblk_t s_sb_block; 1065 uid_t s_resuid; 1066 gid_t s_resgid; 1067 unsigned short s_mount_state; 1068 unsigned short s_pad; 1069 int s_addr_per_block_bits; 1070 int s_desc_per_block_bits; 1071 int s_inode_size; 1072 int s_first_ino; 1073 unsigned int s_inode_readahead_blks; 1074 unsigned int s_inode_goal; 1075 spinlock_t s_next_gen_lock; 1076 u32 s_next_generation; 1077 u32 s_hash_seed[4]; 1078 int s_def_hash_version; 1079 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 1080 struct percpu_counter s_freeblocks_counter; 1081 struct percpu_counter s_freeinodes_counter; 1082 struct percpu_counter s_dirs_counter; 1083 struct percpu_counter s_dirtyblocks_counter; 1084 struct blockgroup_lock *s_blockgroup_lock; 1085 struct proc_dir_entry *s_proc; 1086 struct kobject s_kobj; 1087 struct completion s_kobj_unregister; 1088 1089 /* Journaling */ 1090 struct inode *s_journal_inode; 1091 struct journal_s *s_journal; 1092 struct list_head s_orphan; 1093 struct mutex s_orphan_lock; 1094 struct mutex s_resize_lock; 1095 unsigned long s_commit_interval; 1096 u32 s_max_batch_time; 1097 u32 s_min_batch_time; 1098 struct block_device *journal_bdev; 1099#ifdef CONFIG_JBD2_DEBUG 1100 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 1101 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 1102#endif 1103#ifdef CONFIG_QUOTA 1104 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 1105 int s_jquota_fmt; /* Format of quota to use */ 1106#endif 1107 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 1108 struct rb_root system_blks; 1109 1110#ifdef EXTENTS_STATS 1111 /* ext4 extents stats */ 1112 unsigned long s_ext_min; 1113 unsigned long s_ext_max; 1114 unsigned long s_depth_max; 1115 spinlock_t s_ext_stats_lock; 1116 unsigned long s_ext_blocks; 1117 unsigned long s_ext_extents; 1118#endif 1119 1120 /* for buddy allocator */ 1121 struct ext4_group_info ***s_group_info; 1122 struct inode *s_buddy_cache; 1123 long s_blocks_reserved; 1124 spinlock_t s_reserve_lock; 1125 spinlock_t s_md_lock; 1126 tid_t s_last_transaction; 1127 unsigned short *s_mb_offsets; 1128 unsigned int *s_mb_maxs; 1129 1130 /* tunables */ 1131 unsigned long s_stripe; 1132 unsigned int s_mb_stream_request; 1133 unsigned int s_mb_max_to_scan; 1134 unsigned int s_mb_min_to_scan; 1135 unsigned int s_mb_stats; 1136 unsigned int s_mb_order2_reqs; 1137 unsigned int s_mb_group_prealloc; 1138 unsigned int s_max_writeback_mb_bump; 1139 /* where last allocation was done - for stream allocation */ 1140 unsigned long s_mb_last_group; 1141 unsigned long s_mb_last_start; 1142 1143 /* stats for buddy allocator */ 1144 spinlock_t s_mb_pa_lock; 1145 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 1146 atomic_t s_bal_success; /* we found long enough chunks */ 1147 atomic_t s_bal_allocated; /* in blocks */ 1148 atomic_t s_bal_ex_scanned; /* total extents scanned */ 1149 atomic_t s_bal_goals; /* goal hits */ 1150 atomic_t s_bal_breaks; /* too long searches */ 1151 atomic_t s_bal_2orders; /* 2^order hits */ 1152 spinlock_t s_bal_lock; 1153 unsigned long s_mb_buddies_generated; 1154 unsigned long long s_mb_generation_time; 1155 atomic_t s_mb_lost_chunks; 1156 atomic_t s_mb_preallocated; 1157 atomic_t s_mb_discarded; 1158 atomic_t s_lock_busy; 1159 1160 /* locality groups */ 1161 struct ext4_locality_group __percpu *s_locality_groups; 1162 1163 /* for write statistics */ 1164 unsigned long s_sectors_written_start; 1165 u64 s_kbytes_written; 1166 1167 unsigned int s_log_groups_per_flex; 1168 struct flex_groups *s_flex_groups; 1169 1170 /* workqueue for dio unwritten */ 1171 struct workqueue_struct *dio_unwritten_wq; 1172 1173 /* timer for periodic error stats printing */ 1174 struct timer_list s_err_report; 1175}; 1176 1177static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 1178{ 1179 return sb->s_fs_info; 1180} 1181static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 1182{ 1183 return container_of(inode, struct ext4_inode_info, vfs_inode); 1184} 1185 1186static inline struct timespec ext4_current_time(struct inode *inode) 1187{ 1188 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 1189 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 1190} 1191 1192static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 1193{ 1194 return ino == EXT4_ROOT_INO || 1195 ino == EXT4_JOURNAL_INO || 1196 ino == EXT4_RESIZE_INO || 1197 (ino >= EXT4_FIRST_INO(sb) && 1198 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 1199} 1200 1201/* 1202 * Inode dynamic state flags 1203 */ 1204enum { 1205 EXT4_STATE_JDATA, /* journaled data exists */ 1206 EXT4_STATE_NEW, /* inode is newly created */ 1207 EXT4_STATE_XATTR, /* has in-inode xattrs */ 1208 EXT4_STATE_NO_EXPAND, /* No space for expansion */ 1209 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */ 1210 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */ 1211 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/ 1212 EXT4_STATE_NEWENTRY, /* File just added to dir */ 1213}; 1214 1215#define EXT4_INODE_BIT_FNS(name, field) \ 1216static inline int ext4_test_inode_##name(struct inode *inode, int bit) \ 1217{ \ 1218 return test_bit(bit, &EXT4_I(inode)->i_##field); \ 1219} \ 1220static inline void ext4_set_inode_##name(struct inode *inode, int bit) \ 1221{ \ 1222 set_bit(bit, &EXT4_I(inode)->i_##field); \ 1223} \ 1224static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \ 1225{ \ 1226 clear_bit(bit, &EXT4_I(inode)->i_##field); \ 1227} 1228 1229EXT4_INODE_BIT_FNS(flag, flags) 1230EXT4_INODE_BIT_FNS(state, state_flags) 1231#else 1232/* Assume that user mode programs are passing in an ext4fs superblock, not 1233 * a kernel struct super_block. This will allow us to call the feature-test 1234 * macros from user land. */ 1235#define EXT4_SB(sb) (sb) 1236#endif 1237 1238#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 1239 1240/* 1241 * Codes for operating systems 1242 */ 1243#define EXT4_OS_LINUX 0 1244#define EXT4_OS_HURD 1 1245#define EXT4_OS_MASIX 2 1246#define EXT4_OS_FREEBSD 3 1247#define EXT4_OS_LITES 4 1248 1249/* 1250 * Revision levels 1251 */ 1252#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 1253#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 1254 1255#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 1256#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 1257 1258#define EXT4_GOOD_OLD_INODE_SIZE 128 1259 1260/* 1261 * Feature set definitions 1262 */ 1263 1264#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1265 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1266#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1267 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1268#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1269 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1270#define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1271 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1272#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1273 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1274#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1275 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1276#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1277 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1278#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1279 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1280#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1281 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1282 1283#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1284#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1285#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1286#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1287#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1288#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1289 1290#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1291#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1292#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1293#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1294#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1295#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1296#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1297 1298#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1299#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1300#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1301#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1302#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1303#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1304#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1305#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1306#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1307#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */ 1308#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */ 1309 1310#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1311#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1312 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1313 EXT4_FEATURE_INCOMPAT_META_BG| \ 1314 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1315 EXT4_FEATURE_INCOMPAT_64BIT| \ 1316 EXT4_FEATURE_INCOMPAT_FLEX_BG) 1317#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1318 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1319 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1320 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1321 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1322 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1323 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1324 1325/* 1326 * Default values for user and/or group using reserved blocks 1327 */ 1328#define EXT4_DEF_RESUID 0 1329#define EXT4_DEF_RESGID 0 1330 1331#define EXT4_DEF_INODE_READAHEAD_BLKS 32 1332 1333/* 1334 * Default mount options 1335 */ 1336#define EXT4_DEFM_DEBUG 0x0001 1337#define EXT4_DEFM_BSDGROUPS 0x0002 1338#define EXT4_DEFM_XATTR_USER 0x0004 1339#define EXT4_DEFM_ACL 0x0008 1340#define EXT4_DEFM_UID16 0x0010 1341#define EXT4_DEFM_JMODE 0x0060 1342#define EXT4_DEFM_JMODE_DATA 0x0020 1343#define EXT4_DEFM_JMODE_ORDERED 0x0040 1344#define EXT4_DEFM_JMODE_WBACK 0x0060 1345#define EXT4_DEFM_NOBARRIER 0x0100 1346#define EXT4_DEFM_BLOCK_VALIDITY 0x0200 1347#define EXT4_DEFM_DISCARD 0x0400 1348#define EXT4_DEFM_NODELALLOC 0x0800 1349 1350/* 1351 * Default journal batch times 1352 */ 1353#define EXT4_DEF_MIN_BATCH_TIME 0 1354#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1355 1356/* 1357 * Minimum number of groups in a flexgroup before we separate out 1358 * directories into the first block group of a flexgroup 1359 */ 1360#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1361 1362/* 1363 * Structure of a directory entry 1364 */ 1365#define EXT4_NAME_LEN 255 1366 1367struct ext4_dir_entry { 1368 __le32 inode; /* Inode number */ 1369 __le16 rec_len; /* Directory entry length */ 1370 __le16 name_len; /* Name length */ 1371 char name[EXT4_NAME_LEN]; /* File name */ 1372}; 1373 1374/* 1375 * The new version of the directory entry. Since EXT4 structures are 1376 * stored in intel byte order, and the name_len field could never be 1377 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1378 * file_type field. 1379 */ 1380struct ext4_dir_entry_2 { 1381 __le32 inode; /* Inode number */ 1382 __le16 rec_len; /* Directory entry length */ 1383 __u8 name_len; /* Name length */ 1384 __u8 file_type; 1385 char name[EXT4_NAME_LEN]; /* File name */ 1386}; 1387 1388/* 1389 * Ext4 directory file types. Only the low 3 bits are used. The 1390 * other bits are reserved for now. 1391 */ 1392#define EXT4_FT_UNKNOWN 0 1393#define EXT4_FT_REG_FILE 1 1394#define EXT4_FT_DIR 2 1395#define EXT4_FT_CHRDEV 3 1396#define EXT4_FT_BLKDEV 4 1397#define EXT4_FT_FIFO 5 1398#define EXT4_FT_SOCK 6 1399#define EXT4_FT_SYMLINK 7 1400 1401#define EXT4_FT_MAX 8 1402 1403/* 1404 * EXT4_DIR_PAD defines the directory entries boundaries 1405 * 1406 * NOTE: It must be a multiple of 4 1407 */ 1408#define EXT4_DIR_PAD 4 1409#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1410#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1411 ~EXT4_DIR_ROUND) 1412#define EXT4_MAX_REC_LEN ((1<<16)-1) 1413 1414/* 1415 * If we ever get support for fs block sizes > page_size, we'll need 1416 * to remove the #if statements in the next two functions... 1417 */ 1418static inline unsigned int 1419ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) 1420{ 1421 unsigned len = le16_to_cpu(dlen); 1422 1423#if (PAGE_CACHE_SIZE >= 65536) 1424 if (len == EXT4_MAX_REC_LEN || len == 0) 1425 return blocksize; 1426 return (len & 65532) | ((len & 3) << 16); 1427#else 1428 return len; 1429#endif 1430} 1431 1432static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) 1433{ 1434 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)) 1435 BUG(); 1436#if (PAGE_CACHE_SIZE >= 65536) 1437 if (len < 65536) 1438 return cpu_to_le16(len); 1439 if (len == blocksize) { 1440 if (blocksize == 65536) 1441 return cpu_to_le16(EXT4_MAX_REC_LEN); 1442 else 1443 return cpu_to_le16(0); 1444 } 1445 return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); 1446#else 1447 return cpu_to_le16(len); 1448#endif 1449} 1450 1451/* 1452 * Hash Tree Directory indexing 1453 * (c) Daniel Phillips, 2001 1454 */ 1455 1456#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1457 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1458 ext4_test_inode_flag((dir), EXT4_INODE_INDEX)) 1459#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1460#define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1461 1462/* Legal values for the dx_root hash_version field: */ 1463 1464#define DX_HASH_LEGACY 0 1465#define DX_HASH_HALF_MD4 1 1466#define DX_HASH_TEA 2 1467#define DX_HASH_LEGACY_UNSIGNED 3 1468#define DX_HASH_HALF_MD4_UNSIGNED 4 1469#define DX_HASH_TEA_UNSIGNED 5 1470 1471#ifdef __KERNEL__ 1472 1473/* hash info structure used by the directory hash */ 1474struct dx_hash_info 1475{ 1476 u32 hash; 1477 u32 minor_hash; 1478 int hash_version; 1479 u32 *seed; 1480}; 1481 1482#define EXT4_HTREE_EOF 0x7fffffff 1483 1484/* 1485 * Control parameters used by ext4_htree_next_block 1486 */ 1487#define HASH_NB_ALWAYS 1 1488 1489 1490/* 1491 * Describe an inode's exact location on disk and in memory 1492 */ 1493struct ext4_iloc 1494{ 1495 struct buffer_head *bh; 1496 unsigned long offset; 1497 ext4_group_t block_group; 1498}; 1499 1500static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1501{ 1502 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1503} 1504 1505/* 1506 * This structure is stuffed into the struct file's private_data field 1507 * for directories. It is where we put information so that we can do 1508 * readdir operations in hash tree order. 1509 */ 1510struct dir_private_info { 1511 struct rb_root root; 1512 struct rb_node *curr_node; 1513 struct fname *extra_fname; 1514 loff_t last_pos; 1515 __u32 curr_hash; 1516 __u32 curr_minor_hash; 1517 __u32 next_hash; 1518}; 1519 1520/* calculate the first block number of the group */ 1521static inline ext4_fsblk_t 1522ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1523{ 1524 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1525 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1526} 1527 1528/* 1529 * Special error return code only used by dx_probe() and its callers. 1530 */ 1531#define ERR_BAD_DX_DIR -75000 1532 1533void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1534 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1535 1536extern struct proc_dir_entry *ext4_proc_root; 1537 1538/* 1539 * Function prototypes 1540 */ 1541 1542/* 1543 * Ok, these declarations are also in <linux/kernel.h> but none of the 1544 * ext4 source programs needs to include it so they are duplicated here. 1545 */ 1546# define NORET_TYPE /**/ 1547# define ATTRIB_NORET __attribute__((noreturn)) 1548# define NORET_AND noreturn, 1549 1550/* bitmap.c */ 1551extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1552 1553/* balloc.c */ 1554extern unsigned int ext4_block_group(struct super_block *sb, 1555 ext4_fsblk_t blocknr); 1556extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1557 ext4_fsblk_t blocknr); 1558extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1559extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1560 ext4_group_t group); 1561extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1562 ext4_fsblk_t goal, unsigned long *count, int *errp); 1563extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1564extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1565extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1566 ext4_fsblk_t block, unsigned long count); 1567extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1568extern void ext4_check_blocks_bitmap(struct super_block *); 1569extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1570 ext4_group_t block_group, 1571 struct buffer_head ** bh); 1572extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1573struct buffer_head *ext4_read_block_bitmap(struct super_block *sb, 1574 ext4_group_t block_group); 1575extern unsigned ext4_init_block_bitmap(struct super_block *sb, 1576 struct buffer_head *bh, 1577 ext4_group_t group, 1578 struct ext4_group_desc *desc); 1579#define ext4_free_blocks_after_init(sb, group, desc) \ 1580 ext4_init_block_bitmap(sb, NULL, group, desc) 1581 1582/* dir.c */ 1583extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *, 1584 struct ext4_dir_entry_2 *, 1585 struct buffer_head *, unsigned int); 1586#define ext4_check_dir_entry(dir, de, bh, offset) \ 1587 __ext4_check_dir_entry(__func__, __LINE__, (dir), (de), (bh), (offset)) 1588extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1589 __u32 minor_hash, 1590 struct ext4_dir_entry_2 *dirent); 1591extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1592 1593/* fsync.c */ 1594extern int ext4_sync_file(struct file *, int); 1595 1596/* hash.c */ 1597extern int ext4fs_dirhash(const char *name, int len, struct 1598 dx_hash_info *hinfo); 1599 1600/* ialloc.c */ 1601extern struct inode *ext4_new_inode(handle_t *, struct inode *, int, 1602 const struct qstr *qstr, __u32 goal); 1603extern void ext4_free_inode(handle_t *, struct inode *); 1604extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1605extern unsigned long ext4_count_free_inodes(struct super_block *); 1606extern unsigned long ext4_count_dirs(struct super_block *); 1607extern void ext4_check_inodes_bitmap(struct super_block *); 1608extern unsigned ext4_init_inode_bitmap(struct super_block *sb, 1609 struct buffer_head *bh, 1610 ext4_group_t group, 1611 struct ext4_group_desc *desc); 1612extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap); 1613 1614/* mballoc.c */ 1615extern long ext4_mb_stats; 1616extern long ext4_mb_max_to_scan; 1617extern int ext4_mb_init(struct super_block *, int); 1618extern int ext4_mb_release(struct super_block *); 1619extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1620 struct ext4_allocation_request *, int *); 1621extern int ext4_mb_reserve_blocks(struct super_block *, int); 1622extern void ext4_discard_preallocations(struct inode *); 1623extern int __init init_ext4_mballoc(void); 1624extern void exit_ext4_mballoc(void); 1625extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1626 struct buffer_head *bh, ext4_fsblk_t block, 1627 unsigned long count, int flags); 1628extern int ext4_mb_add_groupinfo(struct super_block *sb, 1629 ext4_group_t i, struct ext4_group_desc *desc); 1630extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1631extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1632 ext4_group_t, int); 1633/* inode.c */ 1634struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1635 ext4_lblk_t, int, int *); 1636struct buffer_head *ext4_bread(handle_t *, struct inode *, 1637 ext4_lblk_t, int, int *); 1638int ext4_get_block(struct inode *inode, sector_t iblock, 1639 struct buffer_head *bh_result, int create); 1640 1641extern struct inode *ext4_iget(struct super_block *, unsigned long); 1642extern int ext4_write_inode(struct inode *, struct writeback_control *); 1643extern int ext4_setattr(struct dentry *, struct iattr *); 1644extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1645 struct kstat *stat); 1646extern void ext4_evict_inode(struct inode *); 1647extern void ext4_clear_inode(struct inode *); 1648extern int ext4_sync_inode(handle_t *, struct inode *); 1649extern void ext4_dirty_inode(struct inode *); 1650extern int ext4_change_inode_journal_flag(struct inode *, int); 1651extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1652extern int ext4_can_truncate(struct inode *inode); 1653extern void ext4_truncate(struct inode *); 1654extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); 1655extern void ext4_set_inode_flags(struct inode *); 1656extern void ext4_get_inode_flags(struct ext4_inode_info *); 1657extern int ext4_alloc_da_blocks(struct inode *inode); 1658extern void ext4_set_aops(struct inode *inode); 1659extern int ext4_writepage_trans_blocks(struct inode *); 1660extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1661extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1662extern int ext4_block_truncate_page(handle_t *handle, 1663 struct address_space *mapping, loff_t from); 1664extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1665extern qsize_t *ext4_get_reserved_space(struct inode *inode); 1666extern int flush_completed_IO(struct inode *inode); 1667extern void ext4_da_update_reserve_space(struct inode *inode, 1668 int used, int quota_claim); 1669/* ioctl.c */ 1670extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1671extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1672 1673/* migrate.c */ 1674extern int ext4_ext_migrate(struct inode *); 1675 1676/* namei.c */ 1677extern int ext4_orphan_add(handle_t *, struct inode *); 1678extern int ext4_orphan_del(handle_t *, struct inode *); 1679extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1680 __u32 start_minor_hash, __u32 *next_hash); 1681 1682/* resize.c */ 1683extern int ext4_group_add(struct super_block *sb, 1684 struct ext4_new_group_data *input); 1685extern int ext4_group_extend(struct super_block *sb, 1686 struct ext4_super_block *es, 1687 ext4_fsblk_t n_blocks_count); 1688 1689/* super.c */ 1690extern void __ext4_error(struct super_block *, const char *, unsigned int, 1691 const char *, ...) 1692 __attribute__ ((format (printf, 4, 5))); 1693#define ext4_error(sb, message...) __ext4_error(sb, __func__, \ 1694 __LINE__, ## message) 1695extern void ext4_error_inode(struct inode *, const char *, unsigned int, 1696 ext4_fsblk_t, const char *, ...) 1697 __attribute__ ((format (printf, 5, 6))); 1698extern void ext4_error_file(struct file *, const char *, unsigned int, 1699 const char *, ...) 1700 __attribute__ ((format (printf, 4, 5))); 1701extern void __ext4_std_error(struct super_block *, const char *, 1702 unsigned int, int); 1703extern void __ext4_abort(struct super_block *, const char *, unsigned int, 1704 const char *, ...) 1705 __attribute__ ((format (printf, 4, 5))); 1706#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \ 1707 __LINE__, ## message) 1708extern void __ext4_warning(struct super_block *, const char *, unsigned int, 1709 const char *, ...) 1710 __attribute__ ((format (printf, 4, 5))); 1711#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \ 1712 __LINE__, ## message) 1713extern void ext4_msg(struct super_block *, const char *, const char *, ...) 1714 __attribute__ ((format (printf, 3, 4))); 1715extern void __ext4_grp_locked_error(const char *, unsigned int, \ 1716 struct super_block *, ext4_group_t, \ 1717 unsigned long, ext4_fsblk_t, \ 1718 const char *, ...) 1719 __attribute__ ((format (printf, 7, 8))); 1720#define ext4_grp_locked_error(sb, grp, message...) \ 1721 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message) 1722extern void ext4_update_dynamic_rev(struct super_block *sb); 1723extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1724 __u32 compat); 1725extern int ext4_update_rocompat_feature(handle_t *handle, 1726 struct super_block *sb, __u32 rocompat); 1727extern int ext4_update_incompat_feature(handle_t *handle, 1728 struct super_block *sb, __u32 incompat); 1729extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1730 struct ext4_group_desc *bg); 1731extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1732 struct ext4_group_desc *bg); 1733extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1734 struct ext4_group_desc *bg); 1735extern __u32 ext4_free_blks_count(struct super_block *sb, 1736 struct ext4_group_desc *bg); 1737extern __u32 ext4_free_inodes_count(struct super_block *sb, 1738 struct ext4_group_desc *bg); 1739extern __u32 ext4_used_dirs_count(struct super_block *sb, 1740 struct ext4_group_desc *bg); 1741extern __u32 ext4_itable_unused_count(struct super_block *sb, 1742 struct ext4_group_desc *bg); 1743extern void ext4_block_bitmap_set(struct super_block *sb, 1744 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1745extern void ext4_inode_bitmap_set(struct super_block *sb, 1746 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1747extern void ext4_inode_table_set(struct super_block *sb, 1748 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1749extern void ext4_free_blks_set(struct super_block *sb, 1750 struct ext4_group_desc *bg, __u32 count); 1751extern void ext4_free_inodes_set(struct super_block *sb, 1752 struct ext4_group_desc *bg, __u32 count); 1753extern void ext4_used_dirs_set(struct super_block *sb, 1754 struct ext4_group_desc *bg, __u32 count); 1755extern void ext4_itable_unused_set(struct super_block *sb, 1756 struct ext4_group_desc *bg, __u32 count); 1757extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group, 1758 struct ext4_group_desc *gdp); 1759extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group, 1760 struct ext4_group_desc *gdp); 1761 1762static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1763{ 1764 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1765 le32_to_cpu(es->s_blocks_count_lo); 1766} 1767 1768static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1769{ 1770 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1771 le32_to_cpu(es->s_r_blocks_count_lo); 1772} 1773 1774static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1775{ 1776 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1777 le32_to_cpu(es->s_free_blocks_count_lo); 1778} 1779 1780static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1781 ext4_fsblk_t blk) 1782{ 1783 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1784 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1785} 1786 1787static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1788 ext4_fsblk_t blk) 1789{ 1790 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1791 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1792} 1793 1794static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1795 ext4_fsblk_t blk) 1796{ 1797 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1798 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1799} 1800 1801static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1802{ 1803 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1804 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1805 le32_to_cpu(raw_inode->i_size_lo); 1806 else 1807 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1808} 1809 1810static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1811{ 1812 raw_inode->i_size_lo = cpu_to_le32(i_size); 1813 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1814} 1815 1816static inline 1817struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1818 ext4_group_t group) 1819{ 1820 struct ext4_group_info ***grp_info; 1821 long indexv, indexh; 1822 grp_info = EXT4_SB(sb)->s_group_info; 1823 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1824 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1825 return grp_info[indexv][indexh]; 1826} 1827 1828/* 1829 * Reading s_groups_count requires using smp_rmb() afterwards. See 1830 * the locking protocol documented in the comments of ext4_group_add() 1831 * in resize.c 1832 */ 1833static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1834{ 1835 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1836 1837 smp_rmb(); 1838 return ngroups; 1839} 1840 1841static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1842 ext4_group_t block_group) 1843{ 1844 return block_group >> sbi->s_log_groups_per_flex; 1845} 1846 1847static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1848{ 1849 return 1 << sbi->s_log_groups_per_flex; 1850} 1851 1852#define ext4_std_error(sb, errno) \ 1853do { \ 1854 if ((errno)) \ 1855 __ext4_std_error((sb), __func__, __LINE__, (errno)); \ 1856} while (0) 1857 1858#ifdef CONFIG_SMP 1859/* Each CPU can accumulate percpu_counter_batch blocks in their local 1860 * counters. So we need to make sure we have free blocks more 1861 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1862 */ 1863#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1864#else 1865#define EXT4_FREEBLOCKS_WATERMARK 0 1866#endif 1867 1868static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1869{ 1870 down_write(&EXT4_I(inode)->i_data_sem); 1871 if (newsize > EXT4_I(inode)->i_disksize) 1872 EXT4_I(inode)->i_disksize = newsize; 1873 up_write(&EXT4_I(inode)->i_data_sem); 1874 return ; 1875} 1876 1877struct ext4_group_info { 1878 unsigned long bb_state; 1879 struct rb_root bb_free_root; 1880 ext4_grpblk_t bb_first_free; /* first free block */ 1881 ext4_grpblk_t bb_free; /* total free blocks */ 1882 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */ 1883 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */ 1884 struct list_head bb_prealloc_list; 1885#ifdef DOUBLE_CHECK 1886 void *bb_bitmap; 1887#endif 1888 struct rw_semaphore alloc_sem; 1889 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block 1890 * regions, index is order. 1891 * bb_counters[3] = 5 means 1892 * 5 free 8-block regions. */ 1893}; 1894 1895#define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1896 1897#define EXT4_MB_GRP_NEED_INIT(grp) \ 1898 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1899 1900#define EXT4_MAX_CONTENTION 8 1901#define EXT4_CONTENTION_THRESHOLD 2 1902 1903static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb, 1904 ext4_group_t group) 1905{ 1906 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group); 1907} 1908 1909/* 1910 * Returns true if the filesystem is busy enough that attempts to 1911 * access the block group locks has run into contention. 1912 */ 1913static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi) 1914{ 1915 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD); 1916} 1917 1918static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1919{ 1920 spinlock_t *lock = ext4_group_lock_ptr(sb, group); 1921 if (spin_trylock(lock)) 1922 /* 1923 * We're able to grab the lock right away, so drop the 1924 * lock contention counter. 1925 */ 1926 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0); 1927 else { 1928 /* 1929 * The lock is busy, so bump the contention counter, 1930 * and then wait on the spin lock. 1931 */ 1932 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1, 1933 EXT4_MAX_CONTENTION); 1934 spin_lock(lock); 1935 } 1936} 1937 1938static inline void ext4_unlock_group(struct super_block *sb, 1939 ext4_group_t group) 1940{ 1941 spin_unlock(ext4_group_lock_ptr(sb, group)); 1942} 1943 1944static inline void ext4_mark_super_dirty(struct super_block *sb) 1945{ 1946 if (EXT4_SB(sb)->s_journal == NULL) 1947 sb->s_dirt =1; 1948} 1949 1950/* 1951 * Inodes and files operations 1952 */ 1953 1954/* dir.c */ 1955extern const struct file_operations ext4_dir_operations; 1956 1957/* file.c */ 1958extern const struct inode_operations ext4_file_inode_operations; 1959extern const struct file_operations ext4_file_operations; 1960 1961/* namei.c */ 1962extern const struct inode_operations ext4_dir_inode_operations; 1963extern const struct inode_operations ext4_special_inode_operations; 1964extern struct dentry *ext4_get_parent(struct dentry *child); 1965 1966/* symlink.c */ 1967extern const struct inode_operations ext4_symlink_inode_operations; 1968extern const struct inode_operations ext4_fast_symlink_inode_operations; 1969 1970/* block_validity */ 1971extern void ext4_release_system_zone(struct super_block *sb); 1972extern int ext4_setup_system_zone(struct super_block *sb); 1973extern int __init init_ext4_system_zone(void); 1974extern void exit_ext4_system_zone(void); 1975extern int ext4_data_block_valid(struct ext4_sb_info *sbi, 1976 ext4_fsblk_t start_blk, 1977 unsigned int count); 1978 1979/* extents.c */ 1980extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1981extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1982extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1983 int chunk); 1984extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, 1985 struct ext4_map_blocks *map, int flags); 1986extern void ext4_ext_truncate(struct inode *); 1987extern void ext4_ext_init(struct super_block *); 1988extern void ext4_ext_release(struct super_block *); 1989extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1990 loff_t len); 1991extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset, 1992 ssize_t len); 1993extern int ext4_map_blocks(handle_t *handle, struct inode *inode, 1994 struct ext4_map_blocks *map, int flags); 1995extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1996 __u64 start, __u64 len); 1997/* move_extent.c */ 1998extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, 1999 __u64 start_orig, __u64 start_donor, 2000 __u64 len, __u64 *moved_len); 2001 2002 2003/* BH_Uninit flag: blocks are allocated but uninitialized on disk */ 2004enum ext4_state_bits { 2005 BH_Uninit /* blocks are allocated but uninitialized on disk */ 2006 = BH_JBDPrivateStart, 2007}; 2008 2009BUFFER_FNS(Uninit, uninit) 2010TAS_BUFFER_FNS(Uninit, uninit) 2011 2012/* 2013 * Add new method to test wether block and inode bitmaps are properly 2014 * initialized. With uninit_bg reading the block from disk is not enough 2015 * to mark the bitmap uptodate. We need to also zero-out the bitmap 2016 */ 2017#define BH_BITMAP_UPTODATE BH_JBDPrivateStart 2018 2019static inline int bitmap_uptodate(struct buffer_head *bh) 2020{ 2021 return (buffer_uptodate(bh) && 2022 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 2023} 2024static inline void set_bitmap_uptodate(struct buffer_head *bh) 2025{ 2026 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 2027} 2028 2029#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1) 2030 2031#endif /* __KERNEL__ */ 2032 2033#endif /* _EXT4_H */ 2034