1 /* 2 * ext4.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _EXT4_H 17 #define _EXT4_H 18 19 #include <linux/types.h> 20 #include <linux/blkdev.h> 21 #include <linux/magic.h> 22 #include <linux/jbd2.h> 23 #include <linux/quota.h> 24 #include <linux/rwsem.h> 25 #include <linux/rbtree.h> 26 #include <linux/seqlock.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/wait.h> 30 #include <linux/blockgroup_lock.h> 31 #include <linux/percpu_counter.h> 32 33 /* 34 * The fourth extended filesystem constants/structures 35 */ 36 37 /* 38 * Define EXT4FS_DEBUG to produce debug messages 39 */ 40 #undef EXT4FS_DEBUG 41 42 /* 43 * Debug code 44 */ 45 #ifdef EXT4FS_DEBUG 46 #define ext4_debug(f, a...) \ 47 do { \ 48 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ 49 __FILE__, __LINE__, __func__); \ 50 printk(KERN_DEBUG f, ## a); \ 51 } while (0) 52 #else 53 #define ext4_debug(f, a...) do {} while (0) 54 #endif 55 56 /* data type for block offset of block group */ 57 typedef int ext4_grpblk_t; 58 59 /* data type for filesystem-wide blocks number */ 60 typedef unsigned long long ext4_fsblk_t; 61 62 /* data type for file logical block number */ 63 typedef __u32 ext4_lblk_t; 64 65 /* data type for block group number */ 66 typedef unsigned int ext4_group_t; 67 68 69 /* prefer goal again. length */ 70 #define EXT4_MB_HINT_MERGE 1 71 /* blocks already reserved */ 72 #define EXT4_MB_HINT_RESERVED 2 73 /* metadata is being allocated */ 74 #define EXT4_MB_HINT_METADATA 4 75 /* first blocks in the file */ 76 #define EXT4_MB_HINT_FIRST 8 77 /* search for the best chunk */ 78 #define EXT4_MB_HINT_BEST 16 79 /* data is being allocated */ 80 #define EXT4_MB_HINT_DATA 32 81 /* don't preallocate (for tails) */ 82 #define EXT4_MB_HINT_NOPREALLOC 64 83 /* allocate for locality group */ 84 #define EXT4_MB_HINT_GROUP_ALLOC 128 85 /* allocate goal blocks or none */ 86 #define EXT4_MB_HINT_GOAL_ONLY 256 87 /* goal is meaningful */ 88 #define EXT4_MB_HINT_TRY_GOAL 512 89 /* blocks already pre-reserved by delayed allocation */ 90 #define EXT4_MB_DELALLOC_RESERVED 1024 91 92 93 struct ext4_allocation_request { 94 /* target inode for block we're allocating */ 95 struct inode *inode; 96 /* logical block in target inode */ 97 ext4_lblk_t logical; 98 /* phys. target (a hint) */ 99 ext4_fsblk_t goal; 100 /* the closest logical allocated block to the left */ 101 ext4_lblk_t lleft; 102 /* phys. block for ^^^ */ 103 ext4_fsblk_t pleft; 104 /* the closest logical allocated block to the right */ 105 ext4_lblk_t lright; 106 /* phys. block for ^^^ */ 107 ext4_fsblk_t pright; 108 /* how many blocks we want to allocate */ 109 unsigned int len; 110 /* flags. see above EXT4_MB_HINT_* */ 111 unsigned int flags; 112 }; 113 114 /* 115 * Special inodes numbers 116 */ 117 #define EXT4_BAD_INO 1 /* Bad blocks inode */ 118 #define EXT4_ROOT_INO 2 /* Root inode */ 119 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ 120 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ 121 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ 122 #define EXT4_JOURNAL_INO 8 /* Journal inode */ 123 124 /* First non-reserved inode for old ext4 filesystems */ 125 #define EXT4_GOOD_OLD_FIRST_INO 11 126 127 /* 128 * Maximal count of links to a file 129 */ 130 #define EXT4_LINK_MAX 65000 131 132 /* 133 * Macro-instructions used to manage several block sizes 134 */ 135 #define EXT4_MIN_BLOCK_SIZE 1024 136 #define EXT4_MAX_BLOCK_SIZE 65536 137 #define EXT4_MIN_BLOCK_LOG_SIZE 10 138 #ifdef __KERNEL__ 139 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) 140 #else 141 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) 142 #endif 143 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) 144 #ifdef __KERNEL__ 145 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 146 #else 147 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 148 #endif 149 #ifdef __KERNEL__ 150 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) 151 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) 152 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) 153 #else 154 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 155 EXT4_GOOD_OLD_INODE_SIZE : \ 156 (s)->s_inode_size) 157 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ 158 EXT4_GOOD_OLD_FIRST_INO : \ 159 (s)->s_first_ino) 160 #endif 161 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) 162 163 /* 164 * Structure of a blocks group descriptor 165 */ 166 struct ext4_group_desc 167 { 168 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ 169 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ 170 __le32 bg_inode_table_lo; /* Inodes table block */ 171 __le16 bg_free_blocks_count_lo;/* Free blocks count */ 172 __le16 bg_free_inodes_count_lo;/* Free inodes count */ 173 __le16 bg_used_dirs_count_lo; /* Directories count */ 174 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ 175 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ 176 __le16 bg_itable_unused_lo; /* Unused inodes count */ 177 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ 178 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ 179 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ 180 __le32 bg_inode_table_hi; /* Inodes table block MSB */ 181 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ 182 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ 183 __le16 bg_used_dirs_count_hi; /* Directories count MSB */ 184 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ 185 __u32 bg_reserved2[3]; 186 }; 187 188 /* 189 * Structure of a flex block group info 190 */ 191 192 struct flex_groups { 193 atomic_t free_inodes; 194 atomic_t free_blocks; 195 atomic_t used_dirs; 196 }; 197 198 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ 199 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ 200 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ 201 202 /* 203 * Macro-instructions used to manage group descriptors 204 */ 205 #define EXT4_MIN_DESC_SIZE 32 206 #define EXT4_MIN_DESC_SIZE_64BIT 64 207 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE 208 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) 209 #ifdef __KERNEL__ 210 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) 211 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) 212 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) 213 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) 214 #else 215 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 216 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) 217 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 218 #endif 219 220 /* 221 * Constants relative to the data blocks 222 */ 223 #define EXT4_NDIR_BLOCKS 12 224 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS 225 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) 226 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) 227 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) 228 229 /* 230 * Inode flags 231 */ 232 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ 233 #define EXT4_UNRM_FL 0x00000002 /* Undelete */ 234 #define EXT4_COMPR_FL 0x00000004 /* Compress file */ 235 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ 236 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ 237 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ 238 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ 239 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ 240 /* Reserved for compression usage... */ 241 #define EXT4_DIRTY_FL 0x00000100 242 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 243 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ 244 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ 245 /* End compression flags --- maybe not all used */ 246 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ 247 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ 248 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 249 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 250 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 251 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 252 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ 253 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 254 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ 255 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ 256 257 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 258 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ 259 260 /* Flags that should be inherited by new inodes from their parent. */ 261 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ 262 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ 263 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ 264 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ 265 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) 266 267 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 268 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) 269 270 /* Flags that are appropriate for non-directories/regular files. */ 271 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) 272 273 /* Mask out flags that are inappropriate for the given type of inode. */ 274 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) 275 { 276 if (S_ISDIR(mode)) 277 return flags; 278 else if (S_ISREG(mode)) 279 return flags & EXT4_REG_FLMASK; 280 else 281 return flags & EXT4_OTHER_FLMASK; 282 } 283 284 /* 285 * Inode dynamic state flags 286 */ 287 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ 288 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ 289 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ 290 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ 291 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ 292 293 /* Used to pass group descriptor data when online resize is done */ 294 struct ext4_new_group_input { 295 __u32 group; /* Group number for this data */ 296 __u64 block_bitmap; /* Absolute block number of block bitmap */ 297 __u64 inode_bitmap; /* Absolute block number of inode bitmap */ 298 __u64 inode_table; /* Absolute block number of inode table start */ 299 __u32 blocks_count; /* Total number of blocks in this group */ 300 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 301 __u16 unused; 302 }; 303 304 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */ 305 struct ext4_new_group_data { 306 __u32 group; 307 __u64 block_bitmap; 308 __u64 inode_bitmap; 309 __u64 inode_table; 310 __u32 blocks_count; 311 __u16 reserved_blocks; 312 __u16 unused; 313 __u32 free_blocks_count; 314 }; 315 316 /* 317 * Following is used by preallocation code to tell get_blocks() that we 318 * want uninitialzed extents. 319 */ 320 #define EXT4_CREATE_UNINITIALIZED_EXT 2 321 322 /* 323 * ioctl commands 324 */ 325 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS 326 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS 327 #define EXT4_IOC_GETVERSION _IOR('f', 3, long) 328 #define EXT4_IOC_SETVERSION _IOW('f', 4, long) 329 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION 330 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION 331 #ifdef CONFIG_JBD2_DEBUG 332 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long) 333 #endif 334 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long) 335 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long) 336 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 337 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input) 338 #define EXT4_IOC_MIGRATE _IO('f', 9) 339 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */ 340 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */ 341 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12) 342 343 /* 344 * ioctl commands in 32 bit emulation 345 */ 346 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS 347 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS 348 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int) 349 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int) 350 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int) 351 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int) 352 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int) 353 #ifdef CONFIG_JBD2_DEBUG 354 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int) 355 #endif 356 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION 357 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION 358 359 360 /* 361 * Mount options 362 */ 363 struct ext4_mount_options { 364 unsigned long s_mount_opt; 365 uid_t s_resuid; 366 gid_t s_resgid; 367 unsigned long s_commit_interval; 368 u32 s_min_batch_time, s_max_batch_time; 369 #ifdef CONFIG_QUOTA 370 int s_jquota_fmt; 371 char *s_qf_names[MAXQUOTAS]; 372 #endif 373 }; 374 375 /* 376 * Structure of an inode on the disk 377 */ 378 struct ext4_inode { 379 __le16 i_mode; /* File mode */ 380 __le16 i_uid; /* Low 16 bits of Owner Uid */ 381 __le32 i_size_lo; /* Size in bytes */ 382 __le32 i_atime; /* Access time */ 383 __le32 i_ctime; /* Inode Change time */ 384 __le32 i_mtime; /* Modification time */ 385 __le32 i_dtime; /* Deletion Time */ 386 __le16 i_gid; /* Low 16 bits of Group Id */ 387 __le16 i_links_count; /* Links count */ 388 __le32 i_blocks_lo; /* Blocks count */ 389 __le32 i_flags; /* File flags */ 390 union { 391 struct { 392 __le32 l_i_version; 393 } linux1; 394 struct { 395 __u32 h_i_translator; 396 } hurd1; 397 struct { 398 __u32 m_i_reserved1; 399 } masix1; 400 } osd1; /* OS dependent 1 */ 401 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */ 402 __le32 i_generation; /* File version (for NFS) */ 403 __le32 i_file_acl_lo; /* File ACL */ 404 __le32 i_size_high; 405 __le32 i_obso_faddr; /* Obsoleted fragment address */ 406 union { 407 struct { 408 __le16 l_i_blocks_high; /* were l_i_reserved1 */ 409 __le16 l_i_file_acl_high; 410 __le16 l_i_uid_high; /* these 2 fields */ 411 __le16 l_i_gid_high; /* were reserved2[0] */ 412 __u32 l_i_reserved2; 413 } linux2; 414 struct { 415 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 416 __u16 h_i_mode_high; 417 __u16 h_i_uid_high; 418 __u16 h_i_gid_high; 419 __u32 h_i_author; 420 } hurd2; 421 struct { 422 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */ 423 __le16 m_i_file_acl_high; 424 __u32 m_i_reserved2[2]; 425 } masix2; 426 } osd2; /* OS dependent 2 */ 427 __le16 i_extra_isize; 428 __le16 i_pad1; 429 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */ 430 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */ 431 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */ 432 __le32 i_crtime; /* File Creation time */ 433 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */ 434 __le32 i_version_hi; /* high 32 bits for 64-bit version */ 435 }; 436 437 438 #define EXT4_EPOCH_BITS 2 439 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1) 440 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS) 441 442 /* 443 * Extended fields will fit into an inode if the filesystem was formatted 444 * with large inodes (-I 256 or larger) and there are not currently any EAs 445 * consuming all of the available space. For new inodes we always reserve 446 * enough space for the kernel's known extended fields, but for inodes 447 * created with an old kernel this might not have been the case. None of 448 * the extended inode fields is critical for correct filesystem operation. 449 * This macro checks if a certain field fits in the inode. Note that 450 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize 451 */ 452 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \ 453 ((offsetof(typeof(*ext4_inode), field) + \ 454 sizeof((ext4_inode)->field)) \ 455 <= (EXT4_GOOD_OLD_INODE_SIZE + \ 456 (einode)->i_extra_isize)) \ 457 458 static inline __le32 ext4_encode_extra_time(struct timespec *time) 459 { 460 return cpu_to_le32((sizeof(time->tv_sec) > 4 ? 461 time->tv_sec >> 32 : 0) | 462 ((time->tv_nsec << 2) & EXT4_NSEC_MASK)); 463 } 464 465 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra) 466 { 467 if (sizeof(time->tv_sec) > 4) 468 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) 469 << 32; 470 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2; 471 } 472 473 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \ 474 do { \ 475 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \ 476 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 477 (raw_inode)->xtime ## _extra = \ 478 ext4_encode_extra_time(&(inode)->xtime); \ 479 } while (0) 480 481 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \ 482 do { \ 483 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 484 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \ 485 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 486 (raw_inode)->xtime ## _extra = \ 487 ext4_encode_extra_time(&(einode)->xtime); \ 488 } while (0) 489 490 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \ 491 do { \ 492 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \ 493 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \ 494 ext4_decode_extra_time(&(inode)->xtime, \ 495 raw_inode->xtime ## _extra); \ 496 } while (0) 497 498 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \ 499 do { \ 500 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \ 501 (einode)->xtime.tv_sec = \ 502 (signed)le32_to_cpu((raw_inode)->xtime); \ 503 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \ 504 ext4_decode_extra_time(&(einode)->xtime, \ 505 raw_inode->xtime ## _extra); \ 506 } while (0) 507 508 #define i_disk_version osd1.linux1.l_i_version 509 510 #if defined(__KERNEL__) || defined(__linux__) 511 #define i_reserved1 osd1.linux1.l_i_reserved1 512 #define i_file_acl_high osd2.linux2.l_i_file_acl_high 513 #define i_blocks_high osd2.linux2.l_i_blocks_high 514 #define i_uid_low i_uid 515 #define i_gid_low i_gid 516 #define i_uid_high osd2.linux2.l_i_uid_high 517 #define i_gid_high osd2.linux2.l_i_gid_high 518 #define i_reserved2 osd2.linux2.l_i_reserved2 519 520 #elif defined(__GNU__) 521 522 #define i_translator osd1.hurd1.h_i_translator 523 #define i_uid_high osd2.hurd2.h_i_uid_high 524 #define i_gid_high osd2.hurd2.h_i_gid_high 525 #define i_author osd2.hurd2.h_i_author 526 527 #elif defined(__masix__) 528 529 #define i_reserved1 osd1.masix1.m_i_reserved1 530 #define i_file_acl_high osd2.masix2.m_i_file_acl_high 531 #define i_reserved2 osd2.masix2.m_i_reserved2 532 533 #endif /* defined(__KERNEL__) || defined(__linux__) */ 534 535 /* 536 * storage for cached extent 537 */ 538 struct ext4_ext_cache { 539 ext4_fsblk_t ec_start; 540 ext4_lblk_t ec_block; 541 __u32 ec_len; /* must be 32bit to return holes */ 542 __u32 ec_type; 543 }; 544 545 /* 546 * fourth extended file system inode data in memory 547 */ 548 struct ext4_inode_info { 549 __le32 i_data[15]; /* unconverted */ 550 __u32 i_flags; 551 ext4_fsblk_t i_file_acl; 552 __u32 i_dtime; 553 554 /* 555 * i_block_group is the number of the block group which contains 556 * this file's inode. Constant across the lifetime of the inode, 557 * it is ued for making block allocation decisions - we try to 558 * place a file's data blocks near its inode block, and new inodes 559 * near to their parent directory's inode. 560 */ 561 ext4_group_t i_block_group; 562 __u32 i_state; /* Dynamic state flags for ext4 */ 563 564 ext4_lblk_t i_dir_start_lookup; 565 #ifdef CONFIG_EXT4_FS_XATTR 566 /* 567 * Extended attributes can be read independently of the main file 568 * data. Taking i_mutex even when reading would cause contention 569 * between readers of EAs and writers of regular file data, so 570 * instead we synchronize on xattr_sem when reading or changing 571 * EAs. 572 */ 573 struct rw_semaphore xattr_sem; 574 #endif 575 #ifdef CONFIG_EXT4_FS_POSIX_ACL 576 struct posix_acl *i_acl; 577 struct posix_acl *i_default_acl; 578 #endif 579 580 struct list_head i_orphan; /* unlinked but open inodes */ 581 582 /* 583 * i_disksize keeps track of what the inode size is ON DISK, not 584 * in memory. During truncate, i_size is set to the new size by 585 * the VFS prior to calling ext4_truncate(), but the filesystem won't 586 * set i_disksize to 0 until the truncate is actually under way. 587 * 588 * The intent is that i_disksize always represents the blocks which 589 * are used by this file. This allows recovery to restart truncate 590 * on orphans if we crash during truncate. We actually write i_disksize 591 * into the on-disk inode when writing inodes out, instead of i_size. 592 * 593 * The only time when i_disksize and i_size may be different is when 594 * a truncate is in progress. The only things which change i_disksize 595 * are ext4_get_block (growth) and ext4_truncate (shrinkth). 596 */ 597 loff_t i_disksize; 598 599 /* 600 * i_data_sem is for serialising ext4_truncate() against 601 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's 602 * data tree are chopped off during truncate. We can't do that in 603 * ext4 because whenever we perform intermediate commits during 604 * truncate, the inode and all the metadata blocks *must* be in a 605 * consistent state which allows truncation of the orphans to restart 606 * during recovery. Hence we must fix the get_block-vs-truncate race 607 * by other means, so we have i_data_sem. 608 */ 609 struct rw_semaphore i_data_sem; 610 struct inode vfs_inode; 611 struct jbd2_inode jinode; 612 613 struct ext4_ext_cache i_cached_extent; 614 /* 615 * File creation time. Its function is same as that of 616 * struct timespec i_{a,c,m}time in the generic inode. 617 */ 618 struct timespec i_crtime; 619 620 /* mballoc */ 621 struct list_head i_prealloc_list; 622 spinlock_t i_prealloc_lock; 623 624 /* ialloc */ 625 ext4_group_t i_last_alloc_group; 626 627 /* allocation reservation info for delalloc */ 628 unsigned int i_reserved_data_blocks; 629 unsigned int i_reserved_meta_blocks; 630 unsigned int i_allocated_meta_blocks; 631 unsigned short i_delalloc_reserved_flag; 632 633 /* on-disk additional length */ 634 __u16 i_extra_isize; 635 636 spinlock_t i_block_reservation_lock; 637 }; 638 639 /* 640 * File system states 641 */ 642 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */ 643 #define EXT4_ERROR_FS 0x0002 /* Errors detected */ 644 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */ 645 646 /* 647 * Misc. filesystem flags 648 */ 649 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */ 650 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */ 651 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */ 652 653 /* 654 * Mount flags 655 */ 656 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */ 657 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */ 658 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */ 659 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */ 660 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */ 661 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */ 662 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */ 663 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/ 664 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */ 665 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */ 666 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */ 667 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */ 668 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */ 669 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */ 670 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */ 671 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */ 672 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */ 673 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */ 674 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */ 675 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */ 676 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */ 677 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */ 678 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */ 679 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */ 680 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */ 681 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */ 682 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */ 683 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ 684 685 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ 686 #ifndef _LINUX_EXT2_FS_H 687 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt 688 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt 689 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ 690 EXT4_MOUNT_##opt) 691 #else 692 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD 693 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT 694 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS 695 #endif 696 697 #define ext4_set_bit ext2_set_bit 698 #define ext4_set_bit_atomic ext2_set_bit_atomic 699 #define ext4_clear_bit ext2_clear_bit 700 #define ext4_clear_bit_atomic ext2_clear_bit_atomic 701 #define ext4_test_bit ext2_test_bit 702 #define ext4_find_first_zero_bit ext2_find_first_zero_bit 703 #define ext4_find_next_zero_bit ext2_find_next_zero_bit 704 #define ext4_find_next_bit ext2_find_next_bit 705 706 /* 707 * Maximal mount counts between two filesystem checks 708 */ 709 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 710 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 711 712 /* 713 * Behaviour when detecting errors 714 */ 715 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */ 716 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */ 717 #define EXT4_ERRORS_PANIC 3 /* Panic */ 718 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE 719 720 /* 721 * Structure of the super block 722 */ 723 struct ext4_super_block { 724 /*00*/ __le32 s_inodes_count; /* Inodes count */ 725 __le32 s_blocks_count_lo; /* Blocks count */ 726 __le32 s_r_blocks_count_lo; /* Reserved blocks count */ 727 __le32 s_free_blocks_count_lo; /* Free blocks count */ 728 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */ 729 __le32 s_first_data_block; /* First Data Block */ 730 __le32 s_log_block_size; /* Block size */ 731 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */ 732 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */ 733 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */ 734 __le32 s_inodes_per_group; /* # Inodes per group */ 735 __le32 s_mtime; /* Mount time */ 736 /*30*/ __le32 s_wtime; /* Write time */ 737 __le16 s_mnt_count; /* Mount count */ 738 __le16 s_max_mnt_count; /* Maximal mount count */ 739 __le16 s_magic; /* Magic signature */ 740 __le16 s_state; /* File system state */ 741 __le16 s_errors; /* Behaviour when detecting errors */ 742 __le16 s_minor_rev_level; /* minor revision level */ 743 /*40*/ __le32 s_lastcheck; /* time of last check */ 744 __le32 s_checkinterval; /* max. time between checks */ 745 __le32 s_creator_os; /* OS */ 746 __le32 s_rev_level; /* Revision level */ 747 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */ 748 __le16 s_def_resgid; /* Default gid for reserved blocks */ 749 /* 750 * These fields are for EXT4_DYNAMIC_REV superblocks only. 751 * 752 * Note: the difference between the compatible feature set and 753 * the incompatible feature set is that if there is a bit set 754 * in the incompatible feature set that the kernel doesn't 755 * know about, it should refuse to mount the filesystem. 756 * 757 * e2fsck's requirements are more strict; if it doesn't know 758 * about a feature in either the compatible or incompatible 759 * feature set, it must abort and not try to meddle with 760 * things it doesn't understand... 761 */ 762 __le32 s_first_ino; /* First non-reserved inode */ 763 __le16 s_inode_size; /* size of inode structure */ 764 __le16 s_block_group_nr; /* block group # of this superblock */ 765 __le32 s_feature_compat; /* compatible feature set */ 766 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */ 767 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 768 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 769 /*78*/ char s_volume_name[16]; /* volume name */ 770 /*88*/ char s_last_mounted[64]; /* directory where last mounted */ 771 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */ 772 /* 773 * Performance hints. Directory preallocation should only 774 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on. 775 */ 776 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 777 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 778 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */ 779 /* 780 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set. 781 */ 782 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 783 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */ 784 __le32 s_journal_dev; /* device number of journal file */ 785 __le32 s_last_orphan; /* start of list of inodes to delete */ 786 __le32 s_hash_seed[4]; /* HTREE hash seed */ 787 __u8 s_def_hash_version; /* Default hash version to use */ 788 __u8 s_reserved_char_pad; 789 __le16 s_desc_size; /* size of group descriptor */ 790 /*100*/ __le32 s_default_mount_opts; 791 __le32 s_first_meta_bg; /* First metablock block group */ 792 __le32 s_mkfs_time; /* When the filesystem was created */ 793 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */ 794 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 795 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */ 796 __le32 s_r_blocks_count_hi; /* Reserved blocks count */ 797 __le32 s_free_blocks_count_hi; /* Free blocks count */ 798 __le16 s_min_extra_isize; /* All inodes have at least # bytes */ 799 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */ 800 __le32 s_flags; /* Miscellaneous flags */ 801 __le16 s_raid_stride; /* RAID stride */ 802 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */ 803 __le64 s_mmp_block; /* Block for multi-mount protection */ 804 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 805 __u8 s_log_groups_per_flex; /* FLEX_BG group size */ 806 __u8 s_reserved_char_pad2; 807 __le16 s_reserved_pad; 808 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ 809 __u32 s_reserved[160]; /* Padding to the end of the block */ 810 }; 811 812 #ifdef __KERNEL__ 813 /* 814 * fourth extended-fs super-block data in memory 815 */ 816 struct ext4_sb_info { 817 unsigned long s_desc_size; /* Size of a group descriptor in bytes */ 818 unsigned long s_inodes_per_block;/* Number of inodes per block */ 819 unsigned long s_blocks_per_group;/* Number of blocks in a group */ 820 unsigned long s_inodes_per_group;/* Number of inodes in a group */ 821 unsigned long s_itb_per_group; /* Number of inode table blocks per group */ 822 unsigned long s_gdb_count; /* Number of group descriptor blocks */ 823 unsigned long s_desc_per_block; /* Number of group descriptors per block */ 824 ext4_group_t s_groups_count; /* Number of groups in the fs */ 825 unsigned long s_overhead_last; /* Last calculated overhead */ 826 unsigned long s_blocks_last; /* Last seen block count */ 827 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */ 828 struct buffer_head * s_sbh; /* Buffer containing the super block */ 829 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */ 830 struct buffer_head **s_group_desc; 831 unsigned long s_mount_opt; 832 ext4_fsblk_t s_sb_block; 833 uid_t s_resuid; 834 gid_t s_resgid; 835 unsigned short s_mount_state; 836 unsigned short s_pad; 837 int s_addr_per_block_bits; 838 int s_desc_per_block_bits; 839 int s_inode_size; 840 int s_first_ino; 841 unsigned int s_inode_readahead_blks; 842 spinlock_t s_next_gen_lock; 843 u32 s_next_generation; 844 u32 s_hash_seed[4]; 845 int s_def_hash_version; 846 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */ 847 struct percpu_counter s_freeblocks_counter; 848 struct percpu_counter s_freeinodes_counter; 849 struct percpu_counter s_dirs_counter; 850 struct percpu_counter s_dirtyblocks_counter; 851 struct blockgroup_lock *s_blockgroup_lock; 852 struct proc_dir_entry *s_proc; 853 struct kobject s_kobj; 854 struct completion s_kobj_unregister; 855 856 /* Journaling */ 857 struct inode *s_journal_inode; 858 struct journal_s *s_journal; 859 struct list_head s_orphan; 860 struct mutex s_orphan_lock; 861 struct mutex s_resize_lock; 862 unsigned long s_commit_interval; 863 u32 s_max_batch_time; 864 u32 s_min_batch_time; 865 struct block_device *journal_bdev; 866 #ifdef CONFIG_JBD2_DEBUG 867 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */ 868 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */ 869 #endif 870 #ifdef CONFIG_QUOTA 871 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */ 872 int s_jquota_fmt; /* Format of quota to use */ 873 #endif 874 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */ 875 876 #ifdef EXTENTS_STATS 877 /* ext4 extents stats */ 878 unsigned long s_ext_min; 879 unsigned long s_ext_max; 880 unsigned long s_depth_max; 881 spinlock_t s_ext_stats_lock; 882 unsigned long s_ext_blocks; 883 unsigned long s_ext_extents; 884 #endif 885 886 /* for buddy allocator */ 887 struct ext4_group_info ***s_group_info; 888 struct inode *s_buddy_cache; 889 long s_blocks_reserved; 890 spinlock_t s_reserve_lock; 891 spinlock_t s_md_lock; 892 tid_t s_last_transaction; 893 unsigned short *s_mb_offsets; 894 unsigned int *s_mb_maxs; 895 896 /* tunables */ 897 unsigned long s_stripe; 898 unsigned int s_mb_stream_request; 899 unsigned int s_mb_max_to_scan; 900 unsigned int s_mb_min_to_scan; 901 unsigned int s_mb_stats; 902 unsigned int s_mb_order2_reqs; 903 unsigned int s_mb_group_prealloc; 904 /* where last allocation was done - for stream allocation */ 905 unsigned long s_mb_last_group; 906 unsigned long s_mb_last_start; 907 908 /* history to debug policy */ 909 struct ext4_mb_history *s_mb_history; 910 int s_mb_history_cur; 911 int s_mb_history_max; 912 int s_mb_history_num; 913 spinlock_t s_mb_history_lock; 914 int s_mb_history_filter; 915 916 /* stats for buddy allocator */ 917 spinlock_t s_mb_pa_lock; 918 atomic_t s_bal_reqs; /* number of reqs with len > 1 */ 919 atomic_t s_bal_success; /* we found long enough chunks */ 920 atomic_t s_bal_allocated; /* in blocks */ 921 atomic_t s_bal_ex_scanned; /* total extents scanned */ 922 atomic_t s_bal_goals; /* goal hits */ 923 atomic_t s_bal_breaks; /* too long searches */ 924 atomic_t s_bal_2orders; /* 2^order hits */ 925 spinlock_t s_bal_lock; 926 unsigned long s_mb_buddies_generated; 927 unsigned long long s_mb_generation_time; 928 atomic_t s_mb_lost_chunks; 929 atomic_t s_mb_preallocated; 930 atomic_t s_mb_discarded; 931 932 /* locality groups */ 933 struct ext4_locality_group *s_locality_groups; 934 935 /* for write statistics */ 936 unsigned long s_sectors_written_start; 937 u64 s_kbytes_written; 938 939 unsigned int s_log_groups_per_flex; 940 struct flex_groups *s_flex_groups; 941 }; 942 943 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb) 944 { 945 return sb->s_fs_info; 946 } 947 static inline struct ext4_inode_info *EXT4_I(struct inode *inode) 948 { 949 return container_of(inode, struct ext4_inode_info, vfs_inode); 950 } 951 952 static inline struct timespec ext4_current_time(struct inode *inode) 953 { 954 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ? 955 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 956 } 957 958 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino) 959 { 960 return ino == EXT4_ROOT_INO || 961 ino == EXT4_JOURNAL_INO || 962 ino == EXT4_RESIZE_INO || 963 (ino >= EXT4_FIRST_INO(sb) && 964 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)); 965 } 966 967 static inline spinlock_t * 968 sb_bgl_lock(struct ext4_sb_info *sbi, unsigned int block_group) 969 { 970 return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); 971 } 972 #else 973 /* Assume that user mode programs are passing in an ext4fs superblock, not 974 * a kernel struct super_block. This will allow us to call the feature-test 975 * macros from user land. */ 976 #define EXT4_SB(sb) (sb) 977 #endif 978 979 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime 980 981 /* 982 * Codes for operating systems 983 */ 984 #define EXT4_OS_LINUX 0 985 #define EXT4_OS_HURD 1 986 #define EXT4_OS_MASIX 2 987 #define EXT4_OS_FREEBSD 3 988 #define EXT4_OS_LITES 4 989 990 /* 991 * Revision levels 992 */ 993 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */ 994 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 995 996 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV 997 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV 998 999 #define EXT4_GOOD_OLD_INODE_SIZE 128 1000 1001 /* 1002 * Feature set definitions 1003 */ 1004 1005 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \ 1006 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0) 1007 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \ 1008 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0) 1009 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \ 1010 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0) 1011 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \ 1012 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 1013 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \ 1014 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 1015 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \ 1016 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 1017 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \ 1018 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 1019 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 1020 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 1021 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 1022 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 1023 1024 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001 1025 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002 1026 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004 1027 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008 1028 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010 1029 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020 1030 1031 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 1032 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 1033 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 1034 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 1035 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 1036 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 1037 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 1038 1039 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001 1040 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002 1041 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 1042 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 1043 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010 1044 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 1045 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 1046 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 1047 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 1048 1049 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 1050 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \ 1051 EXT4_FEATURE_INCOMPAT_RECOVER| \ 1052 EXT4_FEATURE_INCOMPAT_META_BG| \ 1053 EXT4_FEATURE_INCOMPAT_EXTENTS| \ 1054 EXT4_FEATURE_INCOMPAT_64BIT| \ 1055 EXT4_FEATURE_INCOMPAT_FLEX_BG) 1056 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 1057 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \ 1058 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \ 1059 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \ 1060 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \ 1061 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\ 1062 EXT4_FEATURE_RO_COMPAT_HUGE_FILE) 1063 1064 /* 1065 * Default values for user and/or group using reserved blocks 1066 */ 1067 #define EXT4_DEF_RESUID 0 1068 #define EXT4_DEF_RESGID 0 1069 1070 #define EXT4_DEF_INODE_READAHEAD_BLKS 32 1071 1072 /* 1073 * Default mount options 1074 */ 1075 #define EXT4_DEFM_DEBUG 0x0001 1076 #define EXT4_DEFM_BSDGROUPS 0x0002 1077 #define EXT4_DEFM_XATTR_USER 0x0004 1078 #define EXT4_DEFM_ACL 0x0008 1079 #define EXT4_DEFM_UID16 0x0010 1080 #define EXT4_DEFM_JMODE 0x0060 1081 #define EXT4_DEFM_JMODE_DATA 0x0020 1082 #define EXT4_DEFM_JMODE_ORDERED 0x0040 1083 #define EXT4_DEFM_JMODE_WBACK 0x0060 1084 1085 /* 1086 * Default journal batch times 1087 */ 1088 #define EXT4_DEF_MIN_BATCH_TIME 0 1089 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */ 1090 1091 /* 1092 * Minimum number of groups in a flexgroup before we separate out 1093 * directories into the first block group of a flexgroup 1094 */ 1095 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4 1096 1097 /* 1098 * Structure of a directory entry 1099 */ 1100 #define EXT4_NAME_LEN 255 1101 1102 struct ext4_dir_entry { 1103 __le32 inode; /* Inode number */ 1104 __le16 rec_len; /* Directory entry length */ 1105 __le16 name_len; /* Name length */ 1106 char name[EXT4_NAME_LEN]; /* File name */ 1107 }; 1108 1109 /* 1110 * The new version of the directory entry. Since EXT4 structures are 1111 * stored in intel byte order, and the name_len field could never be 1112 * bigger than 255 chars, it's safe to reclaim the extra byte for the 1113 * file_type field. 1114 */ 1115 struct ext4_dir_entry_2 { 1116 __le32 inode; /* Inode number */ 1117 __le16 rec_len; /* Directory entry length */ 1118 __u8 name_len; /* Name length */ 1119 __u8 file_type; 1120 char name[EXT4_NAME_LEN]; /* File name */ 1121 }; 1122 1123 /* 1124 * Ext4 directory file types. Only the low 3 bits are used. The 1125 * other bits are reserved for now. 1126 */ 1127 #define EXT4_FT_UNKNOWN 0 1128 #define EXT4_FT_REG_FILE 1 1129 #define EXT4_FT_DIR 2 1130 #define EXT4_FT_CHRDEV 3 1131 #define EXT4_FT_BLKDEV 4 1132 #define EXT4_FT_FIFO 5 1133 #define EXT4_FT_SOCK 6 1134 #define EXT4_FT_SYMLINK 7 1135 1136 #define EXT4_FT_MAX 8 1137 1138 /* 1139 * EXT4_DIR_PAD defines the directory entries boundaries 1140 * 1141 * NOTE: It must be a multiple of 4 1142 */ 1143 #define EXT4_DIR_PAD 4 1144 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1) 1145 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \ 1146 ~EXT4_DIR_ROUND) 1147 #define EXT4_MAX_REC_LEN ((1<<16)-1) 1148 1149 /* 1150 * Hash Tree Directory indexing 1151 * (c) Daniel Phillips, 2001 1152 */ 1153 1154 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \ 1155 EXT4_FEATURE_COMPAT_DIR_INDEX) && \ 1156 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL)) 1157 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX) 1158 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1) 1159 1160 /* Legal values for the dx_root hash_version field: */ 1161 1162 #define DX_HASH_LEGACY 0 1163 #define DX_HASH_HALF_MD4 1 1164 #define DX_HASH_TEA 2 1165 #define DX_HASH_LEGACY_UNSIGNED 3 1166 #define DX_HASH_HALF_MD4_UNSIGNED 4 1167 #define DX_HASH_TEA_UNSIGNED 5 1168 1169 #ifdef __KERNEL__ 1170 1171 /* hash info structure used by the directory hash */ 1172 struct dx_hash_info 1173 { 1174 u32 hash; 1175 u32 minor_hash; 1176 int hash_version; 1177 u32 *seed; 1178 }; 1179 1180 #define EXT4_HTREE_EOF 0x7fffffff 1181 1182 /* 1183 * Control parameters used by ext4_htree_next_block 1184 */ 1185 #define HASH_NB_ALWAYS 1 1186 1187 1188 /* 1189 * Describe an inode's exact location on disk and in memory 1190 */ 1191 struct ext4_iloc 1192 { 1193 struct buffer_head *bh; 1194 unsigned long offset; 1195 ext4_group_t block_group; 1196 }; 1197 1198 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc) 1199 { 1200 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset); 1201 } 1202 1203 /* 1204 * This structure is stuffed into the struct file's private_data field 1205 * for directories. It is where we put information so that we can do 1206 * readdir operations in hash tree order. 1207 */ 1208 struct dir_private_info { 1209 struct rb_root root; 1210 struct rb_node *curr_node; 1211 struct fname *extra_fname; 1212 loff_t last_pos; 1213 __u32 curr_hash; 1214 __u32 curr_minor_hash; 1215 __u32 next_hash; 1216 }; 1217 1218 /* calculate the first block number of the group */ 1219 static inline ext4_fsblk_t 1220 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no) 1221 { 1222 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) + 1223 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block); 1224 } 1225 1226 /* 1227 * Special error return code only used by dx_probe() and its callers. 1228 */ 1229 #define ERR_BAD_DX_DIR -75000 1230 1231 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, 1232 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp); 1233 1234 extern struct proc_dir_entry *ext4_proc_root; 1235 1236 /* 1237 * Function prototypes 1238 */ 1239 1240 /* 1241 * Ok, these declarations are also in <linux/kernel.h> but none of the 1242 * ext4 source programs needs to include it so they are duplicated here. 1243 */ 1244 # define NORET_TYPE /**/ 1245 # define ATTRIB_NORET __attribute__((noreturn)) 1246 # define NORET_AND noreturn, 1247 1248 /* bitmap.c */ 1249 extern unsigned int ext4_count_free(struct buffer_head *, unsigned); 1250 1251 /* balloc.c */ 1252 extern unsigned int ext4_block_group(struct super_block *sb, 1253 ext4_fsblk_t blocknr); 1254 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb, 1255 ext4_fsblk_t blocknr); 1256 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group); 1257 extern unsigned long ext4_bg_num_gdb(struct super_block *sb, 1258 ext4_group_t group); 1259 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode, 1260 ext4_fsblk_t goal, unsigned long *count, int *errp); 1261 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1262 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); 1263 extern void ext4_free_blocks(handle_t *handle, struct inode *inode, 1264 ext4_fsblk_t block, unsigned long count, int metadata); 1265 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, 1266 ext4_fsblk_t block, unsigned long count); 1267 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *); 1268 extern void ext4_check_blocks_bitmap(struct super_block *); 1269 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb, 1270 ext4_group_t block_group, 1271 struct buffer_head ** bh); 1272 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries); 1273 1274 /* dir.c */ 1275 extern int ext4_check_dir_entry(const char *, struct inode *, 1276 struct ext4_dir_entry_2 *, 1277 struct buffer_head *, unsigned int); 1278 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, 1279 __u32 minor_hash, 1280 struct ext4_dir_entry_2 *dirent); 1281 extern void ext4_htree_free_dir_info(struct dir_private_info *p); 1282 1283 /* fsync.c */ 1284 extern int ext4_sync_file(struct file *, struct dentry *, int); 1285 1286 /* hash.c */ 1287 extern int ext4fs_dirhash(const char *name, int len, struct 1288 dx_hash_info *hinfo); 1289 1290 /* ialloc.c */ 1291 extern struct inode * ext4_new_inode(handle_t *, struct inode *, int); 1292 extern void ext4_free_inode(handle_t *, struct inode *); 1293 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long); 1294 extern unsigned long ext4_count_free_inodes(struct super_block *); 1295 extern unsigned long ext4_count_dirs(struct super_block *); 1296 extern void ext4_check_inodes_bitmap(struct super_block *); 1297 1298 /* mballoc.c */ 1299 extern long ext4_mb_stats; 1300 extern long ext4_mb_max_to_scan; 1301 extern int ext4_mb_init(struct super_block *, int); 1302 extern int ext4_mb_release(struct super_block *); 1303 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *, 1304 struct ext4_allocation_request *, int *); 1305 extern int ext4_mb_reserve_blocks(struct super_block *, int); 1306 extern void ext4_discard_preallocations(struct inode *); 1307 extern int __init init_ext4_mballoc(void); 1308 extern void exit_ext4_mballoc(void); 1309 extern void ext4_mb_free_blocks(handle_t *, struct inode *, 1310 unsigned long, unsigned long, int, unsigned long *); 1311 extern int ext4_mb_add_groupinfo(struct super_block *sb, 1312 ext4_group_t i, struct ext4_group_desc *desc); 1313 extern void ext4_mb_update_group_info(struct ext4_group_info *grp, 1314 ext4_grpblk_t add); 1315 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); 1316 extern void ext4_mb_put_buddy_cache_lock(struct super_block *, 1317 ext4_group_t, int); 1318 /* inode.c */ 1319 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, 1320 struct buffer_head *bh, ext4_fsblk_t blocknr); 1321 struct buffer_head *ext4_getblk(handle_t *, struct inode *, 1322 ext4_lblk_t, int, int *); 1323 struct buffer_head *ext4_bread(handle_t *, struct inode *, 1324 ext4_lblk_t, int, int *); 1325 int ext4_get_block(struct inode *inode, sector_t iblock, 1326 struct buffer_head *bh_result, int create); 1327 1328 extern struct inode *ext4_iget(struct super_block *, unsigned long); 1329 extern int ext4_write_inode(struct inode *, int); 1330 extern int ext4_setattr(struct dentry *, struct iattr *); 1331 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, 1332 struct kstat *stat); 1333 extern void ext4_delete_inode(struct inode *); 1334 extern int ext4_sync_inode(handle_t *, struct inode *); 1335 extern void ext4_dirty_inode(struct inode *); 1336 extern int ext4_change_inode_journal_flag(struct inode *, int); 1337 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); 1338 extern int ext4_can_truncate(struct inode *inode); 1339 extern void ext4_truncate(struct inode *); 1340 extern void ext4_set_inode_flags(struct inode *); 1341 extern void ext4_get_inode_flags(struct ext4_inode_info *); 1342 extern int ext4_alloc_da_blocks(struct inode *inode); 1343 extern void ext4_set_aops(struct inode *inode); 1344 extern int ext4_writepage_trans_blocks(struct inode *); 1345 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); 1346 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks); 1347 extern int ext4_block_truncate_page(handle_t *handle, 1348 struct address_space *mapping, loff_t from); 1349 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 1350 extern qsize_t ext4_get_reserved_space(struct inode *inode); 1351 1352 /* ioctl.c */ 1353 extern long ext4_ioctl(struct file *, unsigned int, unsigned long); 1354 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long); 1355 1356 /* migrate.c */ 1357 extern int ext4_ext_migrate(struct inode *); 1358 1359 /* namei.c */ 1360 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); 1361 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); 1362 extern int ext4_orphan_add(handle_t *, struct inode *); 1363 extern int ext4_orphan_del(handle_t *, struct inode *); 1364 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash, 1365 __u32 start_minor_hash, __u32 *next_hash); 1366 1367 /* resize.c */ 1368 extern int ext4_group_add(struct super_block *sb, 1369 struct ext4_new_group_data *input); 1370 extern int ext4_group_extend(struct super_block *sb, 1371 struct ext4_super_block *es, 1372 ext4_fsblk_t n_blocks_count); 1373 1374 /* super.c */ 1375 extern void ext4_error(struct super_block *, const char *, const char *, ...) 1376 __attribute__ ((format (printf, 3, 4))); 1377 extern void __ext4_std_error(struct super_block *, const char *, int); 1378 extern void ext4_abort(struct super_block *, const char *, const char *, ...) 1379 __attribute__ ((format (printf, 3, 4))); 1380 extern void ext4_warning(struct super_block *, const char *, const char *, ...) 1381 __attribute__ ((format (printf, 3, 4))); 1382 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, 1383 const char *, const char *, ...) 1384 __attribute__ ((format (printf, 4, 5))); 1385 extern void ext4_update_dynamic_rev(struct super_block *sb); 1386 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb, 1387 __u32 compat); 1388 extern int ext4_update_rocompat_feature(handle_t *handle, 1389 struct super_block *sb, __u32 rocompat); 1390 extern int ext4_update_incompat_feature(handle_t *handle, 1391 struct super_block *sb, __u32 incompat); 1392 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1393 struct ext4_group_desc *bg); 1394 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1395 struct ext4_group_desc *bg); 1396 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1397 struct ext4_group_desc *bg); 1398 extern __u32 ext4_free_blks_count(struct super_block *sb, 1399 struct ext4_group_desc *bg); 1400 extern __u32 ext4_free_inodes_count(struct super_block *sb, 1401 struct ext4_group_desc *bg); 1402 extern __u32 ext4_used_dirs_count(struct super_block *sb, 1403 struct ext4_group_desc *bg); 1404 extern __u32 ext4_itable_unused_count(struct super_block *sb, 1405 struct ext4_group_desc *bg); 1406 extern void ext4_block_bitmap_set(struct super_block *sb, 1407 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1408 extern void ext4_inode_bitmap_set(struct super_block *sb, 1409 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1410 extern void ext4_inode_table_set(struct super_block *sb, 1411 struct ext4_group_desc *bg, ext4_fsblk_t blk); 1412 extern void ext4_free_blks_set(struct super_block *sb, 1413 struct ext4_group_desc *bg, __u32 count); 1414 extern void ext4_free_inodes_set(struct super_block *sb, 1415 struct ext4_group_desc *bg, __u32 count); 1416 extern void ext4_used_dirs_set(struct super_block *sb, 1417 struct ext4_group_desc *bg, __u32 count); 1418 extern void ext4_itable_unused_set(struct super_block *sb, 1419 struct ext4_group_desc *bg, __u32 count); 1420 1421 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es) 1422 { 1423 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) | 1424 le32_to_cpu(es->s_blocks_count_lo); 1425 } 1426 1427 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es) 1428 { 1429 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) | 1430 le32_to_cpu(es->s_r_blocks_count_lo); 1431 } 1432 1433 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es) 1434 { 1435 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) | 1436 le32_to_cpu(es->s_free_blocks_count_lo); 1437 } 1438 1439 static inline void ext4_blocks_count_set(struct ext4_super_block *es, 1440 ext4_fsblk_t blk) 1441 { 1442 es->s_blocks_count_lo = cpu_to_le32((u32)blk); 1443 es->s_blocks_count_hi = cpu_to_le32(blk >> 32); 1444 } 1445 1446 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es, 1447 ext4_fsblk_t blk) 1448 { 1449 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk); 1450 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32); 1451 } 1452 1453 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es, 1454 ext4_fsblk_t blk) 1455 { 1456 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk); 1457 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32); 1458 } 1459 1460 static inline loff_t ext4_isize(struct ext4_inode *raw_inode) 1461 { 1462 if (S_ISREG(le16_to_cpu(raw_inode->i_mode))) 1463 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) | 1464 le32_to_cpu(raw_inode->i_size_lo); 1465 else 1466 return (loff_t) le32_to_cpu(raw_inode->i_size_lo); 1467 } 1468 1469 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size) 1470 { 1471 raw_inode->i_size_lo = cpu_to_le32(i_size); 1472 raw_inode->i_size_high = cpu_to_le32(i_size >> 32); 1473 } 1474 1475 static inline 1476 struct ext4_group_info *ext4_get_group_info(struct super_block *sb, 1477 ext4_group_t group) 1478 { 1479 struct ext4_group_info ***grp_info; 1480 long indexv, indexh; 1481 grp_info = EXT4_SB(sb)->s_group_info; 1482 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); 1483 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); 1484 return grp_info[indexv][indexh]; 1485 } 1486 1487 /* 1488 * Reading s_groups_count requires using smp_rmb() afterwards. See 1489 * the locking protocol documented in the comments of ext4_group_add() 1490 * in resize.c 1491 */ 1492 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb) 1493 { 1494 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 1495 1496 smp_rmb(); 1497 return ngroups; 1498 } 1499 1500 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi, 1501 ext4_group_t block_group) 1502 { 1503 return block_group >> sbi->s_log_groups_per_flex; 1504 } 1505 1506 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi) 1507 { 1508 return 1 << sbi->s_log_groups_per_flex; 1509 } 1510 1511 #define ext4_std_error(sb, errno) \ 1512 do { \ 1513 if ((errno)) \ 1514 __ext4_std_error((sb), __func__, (errno)); \ 1515 } while (0) 1516 1517 #ifdef CONFIG_SMP 1518 /* Each CPU can accumulate percpu_counter_batch blocks in their local 1519 * counters. So we need to make sure we have free blocks more 1520 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times. 1521 */ 1522 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids)) 1523 #else 1524 #define EXT4_FREEBLOCKS_WATERMARK 0 1525 #endif 1526 1527 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) 1528 { 1529 /* 1530 * XXX: replace with spinlock if seen contended -bzzz 1531 */ 1532 down_write(&EXT4_I(inode)->i_data_sem); 1533 if (newsize > EXT4_I(inode)->i_disksize) 1534 EXT4_I(inode)->i_disksize = newsize; 1535 up_write(&EXT4_I(inode)->i_data_sem); 1536 return ; 1537 } 1538 1539 struct ext4_group_info { 1540 unsigned long bb_state; 1541 struct rb_root bb_free_root; 1542 unsigned short bb_first_free; 1543 unsigned short bb_free; 1544 unsigned short bb_fragments; 1545 struct list_head bb_prealloc_list; 1546 #ifdef DOUBLE_CHECK 1547 void *bb_bitmap; 1548 #endif 1549 struct rw_semaphore alloc_sem; 1550 unsigned short bb_counters[]; 1551 }; 1552 1553 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 1554 #define EXT4_GROUP_INFO_LOCKED_BIT 1 1555 1556 #define EXT4_MB_GRP_NEED_INIT(grp) \ 1557 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) 1558 1559 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) 1560 { 1561 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1562 1563 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); 1564 } 1565 1566 static inline void ext4_unlock_group(struct super_block *sb, 1567 ext4_group_t group) 1568 { 1569 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1570 1571 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); 1572 } 1573 1574 static inline int ext4_is_group_locked(struct super_block *sb, 1575 ext4_group_t group) 1576 { 1577 struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); 1578 1579 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT, 1580 &(grinfo->bb_state)); 1581 } 1582 1583 /* 1584 * Inodes and files operations 1585 */ 1586 1587 /* dir.c */ 1588 extern const struct file_operations ext4_dir_operations; 1589 1590 /* file.c */ 1591 extern const struct inode_operations ext4_file_inode_operations; 1592 extern const struct file_operations ext4_file_operations; 1593 1594 /* namei.c */ 1595 extern const struct inode_operations ext4_dir_inode_operations; 1596 extern const struct inode_operations ext4_special_inode_operations; 1597 1598 /* symlink.c */ 1599 extern const struct inode_operations ext4_symlink_inode_operations; 1600 extern const struct inode_operations ext4_fast_symlink_inode_operations; 1601 1602 /* extents.c */ 1603 extern int ext4_ext_tree_init(handle_t *handle, struct inode *); 1604 extern int ext4_ext_writepage_trans_blocks(struct inode *, int); 1605 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks, 1606 int chunk); 1607 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, 1608 ext4_lblk_t iblock, unsigned int max_blocks, 1609 struct buffer_head *bh_result, 1610 int create, int extend_disksize); 1611 extern void ext4_ext_truncate(struct inode *); 1612 extern void ext4_ext_init(struct super_block *); 1613 extern void ext4_ext_release(struct super_block *); 1614 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset, 1615 loff_t len); 1616 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, 1617 sector_t block, unsigned int max_blocks, 1618 struct buffer_head *bh, int create, 1619 int extend_disksize, int flag); 1620 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 1621 __u64 start, __u64 len); 1622 1623 /* 1624 * Add new method to test wether block and inode bitmaps are properly 1625 * initialized. With uninit_bg reading the block from disk is not enough 1626 * to mark the bitmap uptodate. We need to also zero-out the bitmap 1627 */ 1628 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart 1629 1630 static inline int bitmap_uptodate(struct buffer_head *bh) 1631 { 1632 return (buffer_uptodate(bh) && 1633 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); 1634 } 1635 static inline void set_bitmap_uptodate(struct buffer_head *bh) 1636 { 1637 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); 1638 } 1639 1640 #endif /* __KERNEL__ */ 1641 1642 #endif /* _EXT4_H */ 1643