| 1 | |
| 2 | |
| 3 | * ext4.h
|
| 4 | *
|
| 5 | * Copyright (C) 1992, 1993, 1994, 1995
|
| 6 | * Remy Card ([email protected])
|
| 7 | * Laboratoire MASI - Institut Blaise Pascal
|
| 8 | * Universite Pierre et Marie Curie (Paris VI)
|
| 9 | *
|
| 10 | * from
|
| 11 | *
|
| 12 | * linux/include/linux/minix_fs.h
|
| 13 | *
|
| 14 | * Copyright (C) 1991, 1992 Linus Torvalds
|
| 15 |
|
| 16 |
|
| 17 | #ifndef _EXT4_H
|
| 18 | #define _EXT4_H
|
| 19 |
|
| 20 | #include <linux/refcount.h>
|
| 21 | #include <linux/types.h>
|
| 22 | #include <linux/blkdev.h>
|
| 23 | #include <linux/magic.h>
|
| 24 | #include <linux/jbd2.h>
|
| 25 | #include <linux/quota.h>
|
| 26 | #include <linux/rwsem.h>
|
| 27 | #include <linux/rbtree.h>
|
| 28 | #include <linux/seqlock.h>
|
| 29 | #include <linux/mutex.h>
|
| 30 | #include <linux/timer.h>
|
| 31 | #include <linux/sched/signal.h>
|
| 32 | #include <linux/blockgroup_lock.h>
|
| 33 | #include <linux/percpu_counter.h>
|
| 34 | #include <linux/ratelimit.h>
|
| 35 | #include <linux/crc32c.h>
|
| 36 | #include <linux/falloc.h>
|
| 37 | #include <linux/percpu-rwsem.h>
|
| 38 | #include <linux/fiemap.h>
|
| 39 | #ifdef __KERNEL__
|
| 40 | #include <linux/compat.h>
|
| 41 | #endif
|
| 42 | #include <uapi/linux/ext4.h>
|
| 43 |
|
| 44 | #include <linux/fscrypt.h>
|
| 45 | #include <linux/fsverity.h>
|
| 46 |
|
| 47 | #include <linux/compiler.h>
|
| 48 |
|
| 49 | |
| 50 | * The fourth extended filesystem constants/structures
|
| 51 |
|
| 52 |
|
| 53 | |
| 54 | * with AGGRESSIVE_CHECK allocator runs consistency checks over
|
| 55 | * structures. these checks slow things down a lot
|
| 56 |
|
| 57 | #define AGGRESSIVE_CHECK__
|
| 58 |
|
| 59 | |
| 60 | * with DOUBLE_CHECK defined mballoc creates persistent in-core
|
| 61 | * bitmaps, maintains and uses them to check for double allocations
|
| 62 |
|
| 63 | #define DOUBLE_CHECK__
|
| 64 |
|
| 65 | |
| 66 | * Define EXT4FS_DEBUG to produce debug messages
|
| 67 |
|
| 68 | #undef EXT4FS_DEBUG
|
| 69 |
|
| 70 | |
| 71 | * Debug code
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| 72 |
|
| 73 | #ifdef EXT4FS_DEBUG
|
| 74 | #define ext4_debug(f, a...) \
|
| 75 | do { \
|
| 76 | printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
|
| 77 | __FILE__, __LINE__, __func__); \
|
| 78 | printk(KERN_DEBUG f, ## a); \
|
| 79 | } while (0)
|
| 80 | #else
|
| 81 | #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
|
| 82 | #endif
|
| 83 |
|
| 84 | |
| 85 | * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
|
| 86 |
|
| 87 | #define EXT_DEBUG__
|
| 88 |
|
| 89 | |
| 90 | * Dynamic printk for controlled extents debugging.
|
| 91 |
|
| 92 | #ifdef CONFIG_EXT4_DEBUG
|
| 93 | #define ext_debug(ino, fmt, ...) \
|
| 94 | pr_debug("[%s/%d] EXT4-fs (%s): ino %llu: (%s, %d): %s:" fmt, \
|
| 95 | current->comm, task_pid_nr(current), \
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| 96 | ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
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| 97 | __func__, ##__VA_ARGS__)
|
| 98 | #else
|
| 99 | #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
|
| 100 | #endif
|
| 101 |
|
| 102 | #define ASSERT(assert) \
|
| 103 | do { \
|
| 104 | if (unlikely(!(assert))) { \
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| 105 | printk(KERN_EMERG \
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| 106 | "Assertion failure in %s() at %s:%d: '%s'\n", \
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| 107 | __func__, __FILE__, __LINE__, #assert); \
|
| 108 | BUG(); \
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| 109 | } \
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| 110 | } while (0)
|
| 111 |
|
| 112 |
|
| 113 | typedef int ext4_grpblk_t;
|
| 114 |
|
| 115 |
|
| 116 | typedef unsigned long long ext4_fsblk_t;
|
| 117 |
|
| 118 |
|
| 119 | typedef __u32 ext4_lblk_t;
|
| 120 |
|
| 121 |
|
| 122 | typedef unsigned int ext4_group_t;
|
| 123 |
|
| 124 | enum SHIFT_DIRECTION {
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| 125 | SHIFT_LEFT = 0,
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| 126 | SHIFT_RIGHT,
|
| 127 | };
|
| 128 |
|
| 129 | |
| 130 | * For each criteria, mballoc has slightly different way of finding
|
| 131 | * the required blocks nad usually, higher the criteria the slower the
|
| 132 | * allocation. We start at lower criterias and keep falling back to
|
| 133 | * higher ones if we are not able to find any blocks. Lower (earlier)
|
| 134 | * criteria are faster.
|
| 135 |
|
| 136 | enum criteria {
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| 137 | |
| 138 | * Used when number of blocks needed is a power of 2. This
|
| 139 | * doesn't trigger any disk IO except prefetch and is the
|
| 140 | * fastest criteria.
|
| 141 |
|
| 142 | CR_POWER2_ALIGNED,
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| 143 |
|
| 144 | |
| 145 | * Tries to lookup in-memory data structures to find the most
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| 146 | * suitable group that satisfies goal request. No disk IO
|
| 147 | * except block prefetch.
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| 148 |
|
| 149 | CR_GOAL_LEN_FAST,
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| 150 |
|
| 151 | |
| 152 | * Same as CR_GOAL_LEN_FAST but is allowed to reduce the goal
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| 153 | * length to the best available length for faster allocation.
|
| 154 |
|
| 155 | CR_BEST_AVAIL_LEN,
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| 156 |
|
| 157 | |
| 158 | * Reads each block group sequentially, performing disk IO if
|
| 159 | * necessary, to find suitable block group. Tries to
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| 160 | * allocate goal length but might trim the request if nothing
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| 161 | * is found after enough tries.
|
| 162 |
|
| 163 | CR_GOAL_LEN_SLOW,
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| 164 |
|
| 165 | |
| 166 | * Finds the first free set of blocks and allocates
|
| 167 | * those. This is only used in rare cases when
|
| 168 | * CR_GOAL_LEN_SLOW also fails to allocate anything.
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| 169 |
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| 170 | CR_ANY_FREE,
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| 171 |
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| 172 | |
| 173 | * Number of criterias defined.
|
| 174 |
|
| 175 | EXT4_MB_NUM_CRS
|
| 176 | };
|
| 177 |
|
| 178 | |
| 179 | * Flags used in mballoc's allocation_context flags field.
|
| 180 | *
|
| 181 | * Also used to show what's going on for debugging purposes when the
|
| 182 | * flag field is exported via the traceport interface
|
| 183 |
|
| 184 |
|
| 185 |
|
| 186 | #define EXT4_MB_HINT_MERGE 0x0001
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| 187 |
|
| 188 | #define EXT4_MB_HINT_FIRST 0x0008
|
| 189 |
|
| 190 | #define EXT4_MB_HINT_DATA 0x0020
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| 191 |
|
| 192 | #define EXT4_MB_HINT_NOPREALLOC 0x0040
|
| 193 |
|
| 194 | #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
|
| 195 |
|
| 196 | #define EXT4_MB_HINT_GOAL_ONLY 0x0100
|
| 197 |
|
| 198 | #define EXT4_MB_HINT_TRY_GOAL 0x0200
|
| 199 |
|
| 200 | #define EXT4_MB_DELALLOC_RESERVED 0x0400
|
| 201 |
|
| 202 | #define EXT4_MB_STREAM_ALLOC 0x0800
|
| 203 |
|
| 204 | #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
|
| 205 |
|
| 206 | #define EXT4_MB_USE_RESERVED 0x2000
|
| 207 |
|
| 208 | #define EXT4_MB_STRICT_CHECK 0x4000
|
| 209 |
|
| 210 | struct ext4_allocation_request {
|
| 211 |
|
| 212 | struct inode *inode;
|
| 213 |
|
| 214 | unsigned int len;
|
| 215 |
|
| 216 | ext4_lblk_t logical;
|
| 217 |
|
| 218 | ext4_lblk_t lleft;
|
| 219 |
|
| 220 | ext4_lblk_t lright;
|
| 221 |
|
| 222 | ext4_fsblk_t goal;
|
| 223 |
|
| 224 | ext4_fsblk_t pleft;
|
| 225 |
|
| 226 | ext4_fsblk_t pright;
|
| 227 |
|
| 228 | unsigned int flags;
|
| 229 | };
|
| 230 |
|
| 231 | |
| 232 | * Logical to physical block mapping, used by ext4_map_blocks()
|
| 233 | *
|
| 234 | * This structure is used to pass requests into ext4_map_blocks() as
|
| 235 | * well as to store the information returned by ext4_map_blocks(). It
|
| 236 | * takes less room on the stack than a struct buffer_head.
|
| 237 |
|
| 238 | #define EXT4_MAP_NEW BIT(BH_New)
|
| 239 | #define EXT4_MAP_MAPPED BIT(BH_Mapped)
|
| 240 | #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
|
| 241 | #define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
|
| 242 | #define EXT4_MAP_DELAYED BIT(BH_Delay)
|
| 243 | |
| 244 | * This is for use in ext4_map_query_blocks() for a special case where we can
|
| 245 | * have a physically and logically contiguous blocks split across two leaf
|
| 246 | * nodes instead of a single extent. This is required in case of atomic writes
|
| 247 | * to know whether the returned extent is last in leaf. If yes, then lookup for
|
| 248 | * next in leaf block in ext4_map_query_blocks_next_in_leaf().
|
| 249 | * - This is never going to be added to any buffer head state.
|
| 250 | * - We use the next available bit after BH_BITMAP_UPTODATE.
|
| 251 |
|
| 252 | #define EXT4_MAP_QUERY_LAST_IN_LEAF BIT(BH_BITMAP_UPTODATE + 1)
|
| 253 | #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
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| 254 | EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
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| 255 | EXT4_MAP_DELAYED | EXT4_MAP_QUERY_LAST_IN_LEAF)
|
| 256 |
|
| 257 | struct ext4_map_blocks {
|
| 258 | ext4_fsblk_t m_pblk;
|
| 259 | ext4_lblk_t m_lblk;
|
| 260 | unsigned int m_len;
|
| 261 | unsigned int m_flags;
|
| 262 | u64 m_seq;
|
| 263 | };
|
| 264 |
|
| 265 | |
| 266 | * Block validity checking, system zone rbtree.
|
| 267 |
|
| 268 | struct ext4_system_blocks {
|
| 269 | struct rb_root root;
|
| 270 | struct rcu_head rcu;
|
| 271 | };
|
| 272 |
|
| 273 | |
| 274 | * Flags for ext4_io_end->flags
|
| 275 |
|
| 276 | #define EXT4_IO_END_UNWRITTEN 0x0001
|
| 277 | #define EXT4_IO_END_FAILED 0x0002
|
| 278 |
|
| 279 | #define EXT4_IO_END_DEFER_COMPLETION (EXT4_IO_END_UNWRITTEN | EXT4_IO_END_FAILED)
|
| 280 |
|
| 281 | struct ext4_io_end_vec {
|
| 282 | struct list_head list;
|
| 283 | loff_t offset;
|
| 284 | ssize_t size;
|
| 285 | };
|
| 286 |
|
| 287 | |
| 288 | * For converting unwritten extents on a work queue. 'handle' is used for
|
| 289 | * buffered writeback.
|
| 290 |
|
| 291 | typedef struct ext4_io_end {
|
| 292 | struct list_head list;
|
| 293 | handle_t *handle; |
| 294 | * conversion
|
| 295 | struct inode *inode;
|
| 296 | struct bio *bio; |
| 297 | * bios covering the extent
|
| 298 | unsigned int flag;
|
| 299 | refcount_t count;
|
| 300 | struct list_head list_vec;
|
| 301 | } ext4_io_end_t;
|
| 302 |
|
| 303 | struct ext4_io_submit {
|
| 304 | struct writeback_control *io_wbc;
|
| 305 | struct bio *io_bio;
|
| 306 | ext4_io_end_t *io_end;
|
| 307 | sector_t io_next_block;
|
| 308 | };
|
| 309 |
|
| 310 | |
| 311 | * Special inodes numbers
|
| 312 |
|
| 313 | #define EXT4_BAD_INO 1
|
| 314 | #define EXT4_ROOT_INO 2
|
| 315 | #define EXT4_USR_QUOTA_INO 3
|
| 316 | #define EXT4_GRP_QUOTA_INO 4
|
| 317 | #define EXT4_BOOT_LOADER_INO 5
|
| 318 | #define EXT4_UNDEL_DIR_INO 6
|
| 319 | #define EXT4_RESIZE_INO 7
|
| 320 | #define EXT4_JOURNAL_INO 8
|
| 321 |
|
| 322 |
|
| 323 | #define EXT4_GOOD_OLD_FIRST_INO 11
|
| 324 |
|
| 325 | |
| 326 | * Maximal count of links to a file
|
| 327 |
|
| 328 | #define EXT4_LINK_MAX 65000
|
| 329 |
|
| 330 | |
| 331 | * Macro-instructions used to manage several block sizes
|
| 332 |
|
| 333 | #define EXT4_MIN_BLOCK_SIZE 1024
|
| 334 | #define EXT4_MAX_BLOCK_SIZE 65536
|
| 335 | #define EXT4_MIN_BLOCK_LOG_SIZE 10
|
| 336 | #define EXT4_MAX_BLOCK_LOG_SIZE 16
|
| 337 | #define EXT4_MAX_CLUSTER_LOG_SIZE 28
|
| 338 | #ifdef __KERNEL__
|
| 339 | # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
|
| 340 | #else
|
| 341 | # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
|
| 342 | #endif
|
| 343 | #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
|
| 344 | #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
|
| 345 | EXT4_SB(s)->s_cluster_bits)
|
| 346 | #ifdef __KERNEL__
|
| 347 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
|
| 348 | # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
|
| 349 | #else
|
| 350 | # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
|
| 351 | #endif
|
| 352 | #ifdef __KERNEL__
|
| 353 | #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
|
| 354 | #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
|
| 355 | #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
|
| 356 | #else
|
| 357 | #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
|
| 358 | EXT4_GOOD_OLD_INODE_SIZE : \
|
| 359 | (s)->s_inode_size)
|
| 360 | #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
|
| 361 | EXT4_GOOD_OLD_FIRST_INO : \
|
| 362 | (s)->s_first_ino)
|
| 363 | #endif
|
| 364 | #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
|
| 365 | #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
|
| 366 | ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
|
| 367 | blkbits))
|
| 368 | #define EXT4_B_TO_LBLK(inode, offset) \
|
| 369 | (round_up((offset), i_blocksize(inode)) >> (inode)->i_blkbits)
|
| 370 | #define EXT4_LBLK_TO_B(inode, lblk) ((loff_t)(lblk) << (inode)->i_blkbits)
|
| 371 |
|
| 372 |
|
| 373 | #define EXT4_LBLK_TO_PG(inode, lblk) (EXT4_LBLK_TO_B((inode), (lblk)) >> \
|
| 374 | PAGE_SHIFT)
|
| 375 |
|
| 376 | #define EXT4_PG_TO_LBLK(inode, pnum) (((loff_t)(pnum) << PAGE_SHIFT) >> \
|
| 377 | (inode)->i_blkbits)
|
| 378 |
|
| 379 | #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
|
| 380 |
|
| 381 | #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
|
| 382 |
|
| 383 | #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
|
| 384 | (sbi)->s_cluster_bits)
|
| 385 |
|
| 386 | #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
|
| 387 | ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
|
| 388 | #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
|
| 389 | ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
|
| 390 |
|
| 391 | #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
|
| 392 | ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
|
| 393 |
|
| 394 | #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
|
| 395 | ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
|
| 396 | #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
|
| 397 | ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
|
| 398 |
|
| 399 | |
| 400 | * Structure of a blocks group descriptor
|
| 401 |
|
| 402 | struct ext4_group_desc
|
| 403 | {
|
| 404 | __le32 bg_block_bitmap_lo;
|
| 405 | __le32 bg_inode_bitmap_lo;
|
| 406 | __le32 bg_inode_table_lo;
|
| 407 | __le16 bg_free_blocks_count_lo;
|
| 408 | __le16 bg_free_inodes_count_lo;
|
| 409 | __le16 bg_used_dirs_count_lo;
|
| 410 | __le16 bg_flags;
|
| 411 | __le32 bg_exclude_bitmap_lo;
|
| 412 | __le16 bg_block_bitmap_csum_lo;
|
| 413 | __le16 bg_inode_bitmap_csum_lo;
|
| 414 | __le16 bg_itable_unused_lo;
|
| 415 | __le16 bg_checksum;
|
| 416 | __le32 bg_block_bitmap_hi;
|
| 417 | __le32 bg_inode_bitmap_hi;
|
| 418 | __le32 bg_inode_table_hi;
|
| 419 | __le16 bg_free_blocks_count_hi;
|
| 420 | __le16 bg_free_inodes_count_hi;
|
| 421 | __le16 bg_used_dirs_count_hi;
|
| 422 | __le16 bg_itable_unused_hi;
|
| 423 | __le32 bg_exclude_bitmap_hi;
|
| 424 | __le16 bg_block_bitmap_csum_hi;
|
| 425 | __le16 bg_inode_bitmap_csum_hi;
|
| 426 | __u32 bg_reserved;
|
| 427 | };
|
| 428 |
|
| 429 | #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
|
| 430 | (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
|
| 431 | sizeof(__le16))
|
| 432 | #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
|
| 433 | (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
|
| 434 | sizeof(__le16))
|
| 435 |
|
| 436 | |
| 437 | * Structure of a flex block group info
|
| 438 |
|
| 439 |
|
| 440 | struct flex_groups {
|
| 441 | atomic64_t free_clusters;
|
| 442 | atomic_t free_inodes;
|
| 443 | atomic_t used_dirs;
|
| 444 | };
|
| 445 |
|
| 446 | #define EXT4_BG_INODE_UNINIT 0x0001
|
| 447 | #define EXT4_BG_BLOCK_UNINIT 0x0002
|
| 448 | #define EXT4_BG_INODE_ZEROED 0x0004
|
| 449 |
|
| 450 | |
| 451 | * Macro-instructions used to manage group descriptors
|
| 452 |
|
| 453 | #define EXT4_MIN_DESC_SIZE 32
|
| 454 | #define EXT4_MIN_DESC_SIZE_64BIT 64
|
| 455 | #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
|
| 456 | #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
|
| 457 | #ifdef __KERNEL__
|
| 458 | # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
|
| 459 | # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
|
| 460 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
|
| 461 | # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
|
| 462 | # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
|
| 463 | #else
|
| 464 | # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
|
| 465 | # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
|
| 466 | # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
|
| 467 | #endif
|
| 468 |
|
| 469 | |
| 470 | * Constants relative to the data blocks
|
| 471 |
|
| 472 | #define EXT4_NDIR_BLOCKS 12
|
| 473 | #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
|
| 474 | #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
|
| 475 | #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
|
| 476 | #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
|
| 477 |
|
| 478 | |
| 479 | * Inode flags
|
| 480 |
|
| 481 | #define EXT4_SECRM_FL 0x00000001
|
| 482 | #define EXT4_UNRM_FL 0x00000002
|
| 483 | #define EXT4_COMPR_FL 0x00000004
|
| 484 | #define EXT4_SYNC_FL 0x00000008
|
| 485 | #define EXT4_IMMUTABLE_FL 0x00000010
|
| 486 | #define EXT4_APPEND_FL 0x00000020
|
| 487 | #define EXT4_NODUMP_FL 0x00000040
|
| 488 | #define EXT4_NOATIME_FL 0x00000080
|
| 489 |
|
| 490 | #define EXT4_DIRTY_FL 0x00000100
|
| 491 | #define EXT4_COMPRBLK_FL 0x00000200
|
| 492 | #define EXT4_NOCOMPR_FL 0x00000400
|
| 493 |
|
| 494 | #define EXT4_ENCRYPT_FL 0x00000800
|
| 495 |
|
| 496 | #define EXT4_INDEX_FL 0x00001000
|
| 497 | #define EXT4_IMAGIC_FL 0x00002000
|
| 498 | #define EXT4_JOURNAL_DATA_FL 0x00004000
|
| 499 | #define EXT4_NOTAIL_FL 0x00008000
|
| 500 | #define EXT4_DIRSYNC_FL 0x00010000
|
| 501 | #define EXT4_TOPDIR_FL 0x00020000
|
| 502 | #define EXT4_HUGE_FILE_FL 0x00040000
|
| 503 | #define EXT4_EXTENTS_FL 0x00080000
|
| 504 | #define EXT4_VERITY_FL 0x00100000
|
| 505 | #define EXT4_EA_INODE_FL 0x00200000
|
| 506 |
|
| 507 |
|
| 508 | #define EXT4_DAX_FL 0x02000000
|
| 509 |
|
| 510 | #define EXT4_INLINE_DATA_FL 0x10000000
|
| 511 | #define EXT4_PROJINHERIT_FL 0x20000000
|
| 512 | #define EXT4_CASEFOLD_FL 0x40000000
|
| 513 | #define EXT4_RESERVED_FL 0x80000000
|
| 514 |
|
| 515 |
|
| 516 | #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
|
| 517 | EXT4_UNRM_FL | \
|
| 518 | EXT4_COMPR_FL | \
|
| 519 | EXT4_SYNC_FL | \
|
| 520 | EXT4_IMMUTABLE_FL | \
|
| 521 | EXT4_APPEND_FL | \
|
| 522 | EXT4_NODUMP_FL | \
|
| 523 | EXT4_NOATIME_FL | \
|
| 524 | EXT4_JOURNAL_DATA_FL | \
|
| 525 | EXT4_NOTAIL_FL | \
|
| 526 | EXT4_DIRSYNC_FL | \
|
| 527 | EXT4_TOPDIR_FL | \
|
| 528 | EXT4_EXTENTS_FL | \
|
| 529 | 0x00400000 | \
|
| 530 | EXT4_DAX_FL | \
|
| 531 | EXT4_PROJINHERIT_FL | \
|
| 532 | EXT4_CASEFOLD_FL)
|
| 533 |
|
| 534 |
|
| 535 | #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
|
| 536 | EXT4_DIRTY_FL | \
|
| 537 | EXT4_COMPRBLK_FL | \
|
| 538 | EXT4_NOCOMPR_FL | \
|
| 539 | EXT4_ENCRYPT_FL | \
|
| 540 | EXT4_INDEX_FL | \
|
| 541 | EXT4_VERITY_FL | \
|
| 542 | EXT4_INLINE_DATA_FL)
|
| 543 |
|
| 544 |
|
| 545 | #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
|
| 546 | EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
|
| 547 | EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
|
| 548 | EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
|
| 549 | EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
|
| 550 | EXT4_DAX_FL)
|
| 551 |
|
| 552 |
|
| 553 | #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
|
| 554 | EXT4_PROJINHERIT_FL))
|
| 555 |
|
| 556 |
|
| 557 | #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
|
| 558 |
|
| 559 |
|
| 560 | #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
|
| 561 |
|
| 562 |
|
| 563 | #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
|
| 564 | EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
|
| 565 |
|
| 566 |
|
| 567 | static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
|
| 568 | {
|
| 569 | if (S_ISDIR(mode))
|
| 570 | return flags;
|
| 571 | else if (S_ISREG(mode))
|
| 572 | return flags & EXT4_REG_FLMASK;
|
| 573 | else
|
| 574 | return flags & EXT4_OTHER_FLMASK;
|
| 575 | }
|
| 576 |
|
| 577 | |
| 578 | * Inode flags used for atomic set/get
|
| 579 |
|
| 580 | enum {
|
| 581 | EXT4_INODE_SECRM = 0,
|
| 582 | EXT4_INODE_UNRM = 1,
|
| 583 | EXT4_INODE_COMPR = 2,
|
| 584 | EXT4_INODE_SYNC = 3,
|
| 585 | EXT4_INODE_IMMUTABLE = 4,
|
| 586 | EXT4_INODE_APPEND = 5,
|
| 587 | EXT4_INODE_NODUMP = 6,
|
| 588 | EXT4_INODE_NOATIME = 7,
|
| 589 |
|
| 590 | EXT4_INODE_DIRTY = 8,
|
| 591 | EXT4_INODE_COMPRBLK = 9,
|
| 592 | EXT4_INODE_NOCOMPR = 10,
|
| 593 | EXT4_INODE_ENCRYPT = 11,
|
| 594 |
|
| 595 | EXT4_INODE_INDEX = 12,
|
| 596 | EXT4_INODE_IMAGIC = 13,
|
| 597 | EXT4_INODE_JOURNAL_DATA = 14,
|
| 598 | EXT4_INODE_NOTAIL = 15,
|
| 599 | EXT4_INODE_DIRSYNC = 16,
|
| 600 | EXT4_INODE_TOPDIR = 17,
|
| 601 | EXT4_INODE_HUGE_FILE = 18,
|
| 602 | EXT4_INODE_EXTENTS = 19,
|
| 603 | EXT4_INODE_VERITY = 20,
|
| 604 | EXT4_INODE_EA_INODE = 21,
|
| 605 |
|
| 606 | EXT4_INODE_DAX = 25,
|
| 607 | EXT4_INODE_INLINE_DATA = 28,
|
| 608 | EXT4_INODE_PROJINHERIT = 29,
|
| 609 | EXT4_INODE_CASEFOLD = 30,
|
| 610 | EXT4_INODE_RESERVED = 31,
|
| 611 | };
|
| 612 |
|
| 613 | |
| 614 | * Since it's pretty easy to mix up bit numbers and hex values, we use a
|
| 615 | * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
|
| 616 | * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
|
| 617 | * any extra space in the compiled kernel image, otherwise, the build will fail.
|
| 618 | * It's important that these values are the same, since we are using
|
| 619 | * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
|
| 620 | * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
|
| 621 | * values found in ext2, ext3 and ext4 filesystems, and of course the values
|
| 622 | * defined in e2fsprogs.
|
| 623 | *
|
| 624 | * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
|
| 625 |
|
| 626 | #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1U << EXT4_INODE_##FLAG))
|
| 627 | #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
|
| 628 |
|
| 629 | static inline void ext4_check_flag_values(void)
|
| 630 | {
|
| 631 | CHECK_FLAG_VALUE(SECRM);
|
| 632 | CHECK_FLAG_VALUE(UNRM);
|
| 633 | CHECK_FLAG_VALUE(COMPR);
|
| 634 | CHECK_FLAG_VALUE(SYNC);
|
| 635 | CHECK_FLAG_VALUE(IMMUTABLE);
|
| 636 | CHECK_FLAG_VALUE(APPEND);
|
| 637 | CHECK_FLAG_VALUE(NODUMP);
|
| 638 | CHECK_FLAG_VALUE(NOATIME);
|
| 639 | CHECK_FLAG_VALUE(DIRTY);
|
| 640 | CHECK_FLAG_VALUE(COMPRBLK);
|
| 641 | CHECK_FLAG_VALUE(NOCOMPR);
|
| 642 | CHECK_FLAG_VALUE(ENCRYPT);
|
| 643 | CHECK_FLAG_VALUE(INDEX);
|
| 644 | CHECK_FLAG_VALUE(IMAGIC);
|
| 645 | CHECK_FLAG_VALUE(JOURNAL_DATA);
|
| 646 | CHECK_FLAG_VALUE(NOTAIL);
|
| 647 | CHECK_FLAG_VALUE(DIRSYNC);
|
| 648 | CHECK_FLAG_VALUE(TOPDIR);
|
| 649 | CHECK_FLAG_VALUE(HUGE_FILE);
|
| 650 | CHECK_FLAG_VALUE(EXTENTS);
|
| 651 | CHECK_FLAG_VALUE(VERITY);
|
| 652 | CHECK_FLAG_VALUE(EA_INODE);
|
| 653 | CHECK_FLAG_VALUE(INLINE_DATA);
|
| 654 | CHECK_FLAG_VALUE(PROJINHERIT);
|
| 655 | CHECK_FLAG_VALUE(CASEFOLD);
|
| 656 | CHECK_FLAG_VALUE(RESERVED);
|
| 657 | }
|
| 658 |
|
| 659 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
|
| 660 | struct compat_ext4_new_group_input {
|
| 661 | u32 group;
|
| 662 | compat_u64 block_bitmap;
|
| 663 | compat_u64 inode_bitmap;
|
| 664 | compat_u64 inode_table;
|
| 665 | u32 blocks_count;
|
| 666 | u16 reserved_blocks;
|
| 667 | u16 unused;
|
| 668 | };
|
| 669 | #endif
|
| 670 |
|
| 671 |
|
| 672 | struct ext4_new_group_data {
|
| 673 | __u32 group;
|
| 674 | __u64 block_bitmap;
|
| 675 | __u64 inode_bitmap;
|
| 676 | __u64 inode_table;
|
| 677 | __u32 blocks_count;
|
| 678 | __u16 reserved_blocks;
|
| 679 | __u16 mdata_blocks;
|
| 680 | __u32 free_clusters_count;
|
| 681 | };
|
| 682 |
|
| 683 |
|
| 684 | enum {
|
| 685 | BLOCK_BITMAP = 0,
|
| 686 | INODE_BITMAP,
|
| 687 | INODE_TABLE,
|
| 688 | GROUP_TABLE_COUNT,
|
| 689 | };
|
| 690 |
|
| 691 | |
| 692 | * Flags used by ext4_map_blocks()
|
| 693 |
|
| 694 | |
| 695 | extent to be an initialized ext4
|
| 696 | #define EXT4_GET_BLOCKS_CREATE 0x0001
|
| 697 |
|
| 698 | #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
|
| 699 | #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
|
| 700 | EXT4_GET_BLOCKS_CREATE)
|
| 701 | |
| 702 | * finally doing the actual allocation of delayed blocks
|
| 703 | #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
|
| 704 | |
| 705 | * This means that we cannot merge newly allocated extents, and if we
|
| 706 | * found an unwritten extent, we need to split it.
|
| 707 |
|
| 708 | #define EXT4_GET_BLOCKS_SPLIT_NOMERGE 0x0008
|
| 709 |
|
| 710 | #define EXT4_GET_BLOCKS_CONVERT 0x0010
|
| 711 | |
| 712 | * should not fail, so try to use reserved blocks for that.
|
| 713 | #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
|
| 714 |
|
| 715 | #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
|
| 716 |
|
| 717 | #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
|
| 718 |
|
| 719 | #define EXT4_GET_BLOCKS_ZERO 0x0200
|
| 720 | #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
|
| 721 | EXT4_GET_BLOCKS_ZERO)
|
| 722 | |
| 723 | * fsync, etc. Especially, in the generic writeback path, caller will
|
| 724 | * submit data before dropping transaction handle. This allows jbd2
|
| 725 | * to avoid submitting data before commit.
|
| 726 | #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
|
| 727 |
|
| 728 | #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT |\
|
| 729 | EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT |\
|
| 730 | EXT4_GET_BLOCKS_IO_SUBMIT)
|
| 731 |
|
| 732 | #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800
|
| 733 | |
| 734 | * Atomic write caller needs this to query in the slow path of mixed mapping
|
| 735 | * case, when a contiguous extent can be split across two adjacent leaf nodes.
|
| 736 | * Look EXT4_MAP_QUERY_LAST_IN_LEAF.
|
| 737 |
|
| 738 | #define EXT4_GET_BLOCKS_QUERY_LAST_IN_LEAF 0x1000
|
| 739 |
|
| 740 | |
| 741 | * The bit position of these flags must not overlap with any of the
|
| 742 | * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
|
| 743 | * read_extent_tree_block(), ext4_split_extent_at(),
|
| 744 | * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
|
| 745 | * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
|
| 746 | * caching the extents when reading from the extent tree while a
|
| 747 | * truncate or punch hole operation is in progress.
|
| 748 |
|
| 749 | #define EXT4_EX_NOCACHE 0x40000000
|
| 750 | #define EXT4_EX_FORCE_CACHE 0x20000000
|
| 751 | #define EXT4_EX_NOFAIL 0x10000000
|
| 752 | |
| 753 | * ext4_map_query_blocks() uses this filter mask to filter the flags needed to
|
| 754 | * pass while lookup/querying of on disk extent tree.
|
| 755 |
|
| 756 | #define EXT4_EX_QUERY_FILTER (EXT4_EX_NOCACHE | EXT4_EX_FORCE_CACHE |\
|
| 757 | EXT4_EX_NOFAIL |\
|
| 758 | EXT4_GET_BLOCKS_QUERY_LAST_IN_LEAF)
|
| 759 |
|
| 760 | |
| 761 | * Flags used by ext4_free_blocks
|
| 762 |
|
| 763 | #define EXT4_FREE_BLOCKS_METADATA 0x0001
|
| 764 | #define EXT4_FREE_BLOCKS_FORGET 0x0002
|
| 765 | #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
|
| 766 | #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
|
| 767 | #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
|
| 768 | #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
|
| 769 | #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
|
| 770 |
|
| 771 | #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
|
| 772 | |
| 773 | * ioctl commands in 32 bit emulation
|
| 774 |
|
| 775 | #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
|
| 776 | #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
|
| 777 | #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
|
| 778 | #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
|
| 779 | #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
|
| 780 | #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
|
| 781 | #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
|
| 782 | #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
|
| 783 | #endif
|
| 784 |
|
| 785 |
|
| 786 | #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
|
| 787 |
|
| 788 |
|
| 789 | #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
|
| 790 |
|
| 791 | |
| 792 | * Structure of an inode on the disk
|
| 793 |
|
| 794 | struct ext4_inode {
|
| 795 | __le16 i_mode;
|
| 796 | __le16 i_uid;
|
| 797 | __le32 i_size_lo;
|
| 798 | __le32 i_atime;
|
| 799 | __le32 i_ctime;
|
| 800 | __le32 i_mtime;
|
| 801 | __le32 i_dtime;
|
| 802 | __le16 i_gid;
|
| 803 | __le16 i_links_count;
|
| 804 | __le32 i_blocks_lo;
|
| 805 | __le32 i_flags;
|
| 806 | union {
|
| 807 | struct {
|
| 808 | __le32 l_i_version;
|
| 809 | } linux1;
|
| 810 | struct {
|
| 811 | __u32 h_i_translator;
|
| 812 | } hurd1;
|
| 813 | struct {
|
| 814 | __u32 m_i_reserved1;
|
| 815 | } masix1;
|
| 816 | } osd1;
|
| 817 | __le32 i_block[EXT4_N_BLOCKS];
|
| 818 | __le32 i_generation;
|
| 819 | __le32 i_file_acl_lo;
|
| 820 | __le32 i_size_high;
|
| 821 | __le32 i_obso_faddr;
|
| 822 | union {
|
| 823 | struct {
|
| 824 | __le16 l_i_blocks_high;
|
| 825 | __le16 l_i_file_acl_high;
|
| 826 | __le16 l_i_uid_high;
|
| 827 | __le16 l_i_gid_high;
|
| 828 | __le16 l_i_checksum_lo;
|
| 829 | __le16 l_i_reserved;
|
| 830 | } linux2;
|
| 831 | struct {
|
| 832 | __le16 h_i_reserved1;
|
| 833 | __u16 h_i_mode_high;
|
| 834 | __u16 h_i_uid_high;
|
| 835 | __u16 h_i_gid_high;
|
| 836 | __u32 h_i_author;
|
| 837 | } hurd2;
|
| 838 | struct {
|
| 839 | __le16 h_i_reserved1;
|
| 840 | __le16 m_i_file_acl_high;
|
| 841 | __u32 m_i_reserved2[2];
|
| 842 | } masix2;
|
| 843 | } osd2;
|
| 844 | __le16 i_extra_isize;
|
| 845 | __le16 i_checksum_hi;
|
| 846 | __le32 i_ctime_extra;
|
| 847 | __le32 i_mtime_extra;
|
| 848 | __le32 i_atime_extra;
|
| 849 | __le32 i_crtime;
|
| 850 | __le32 i_crtime_extra;
|
| 851 | __le32 i_version_hi;
|
| 852 | __le32 i_projid;
|
| 853 | };
|
| 854 |
|
| 855 | #define EXT4_EPOCH_BITS 2
|
| 856 | #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
|
| 857 | #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
|
| 858 |
|
| 859 | |
| 860 | * Extended fields will fit into an inode if the filesystem was formatted
|
| 861 | * with large inodes (-I 256 or larger) and there are not currently any EAs
|
| 862 | * consuming all of the available space. For new inodes we always reserve
|
| 863 | * enough space for the kernel's known extended fields, but for inodes
|
| 864 | * created with an old kernel this might not have been the case. None of
|
| 865 | * the extended inode fields is critical for correct filesystem operation.
|
| 866 | * This macro checks if a certain field fits in the inode. Note that
|
| 867 | * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
|
| 868 |
|
| 869 | #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
|
| 870 | ((offsetof(typeof(*ext4_inode), field) + \
|
| 871 | sizeof((ext4_inode)->field)) \
|
| 872 | <= (EXT4_GOOD_OLD_INODE_SIZE + \
|
| 873 | (einode)->i_extra_isize)) \
|
| 874 |
|
| 875 | |
| 876 | * We use an encoding that preserves the times for extra epoch "00":
|
| 877 | *
|
| 878 | * extra msb of adjust for signed
|
| 879 | * epoch 32-bit 32-bit tv_sec to
|
| 880 | * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
|
| 881 | * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
|
| 882 | * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
|
| 883 | * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
|
| 884 | * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
|
| 885 | * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
|
| 886 | * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
|
| 887 | * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
|
| 888 | * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
|
| 889 | *
|
| 890 | * Note that previous versions of the kernel on 64-bit systems would
|
| 891 | * incorrectly use extra epoch bits 1,1 for dates between 1901 and
|
| 892 | * 1970. e2fsck will correct this, assuming that it is run on the
|
| 893 | * affected filesystem before 2242.
|
| 894 |
|
| 895 |
|
| 896 | static inline __le32 ext4_encode_extra_time(struct timespec64 ts)
|
| 897 | {
|
| 898 | u32 extra = ((ts.tv_sec - (s32)ts.tv_sec) >> 32) & EXT4_EPOCH_MASK;
|
| 899 | return cpu_to_le32(extra | (ts.tv_nsec << EXT4_EPOCH_BITS));
|
| 900 | }
|
| 901 |
|
| 902 | static inline struct timespec64 ext4_decode_extra_time(__le32 base,
|
| 903 | __le32 extra)
|
| 904 | {
|
| 905 | struct timespec64 ts = { .tv_sec = (signed)le32_to_cpu(base) };
|
| 906 |
|
| 907 | if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
|
| 908 | ts.tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
|
| 909 | ts.tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
|
| 910 | return ts;
|
| 911 | }
|
| 912 |
|
| 913 | #define EXT4_INODE_SET_XTIME_VAL(xtime, inode, raw_inode, ts) \
|
| 914 | do { \
|
| 915 | if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
|
| 916 | (raw_inode)->xtime = cpu_to_le32((ts).tv_sec); \
|
| 917 | (raw_inode)->xtime ## _extra = ext4_encode_extra_time(ts); \
|
| 918 | } else \
|
| 919 | (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (ts).tv_sec, S32_MIN, S32_MAX)); \
|
| 920 | } while (0)
|
| 921 |
|
| 922 | #define EXT4_INODE_SET_ATIME(inode, raw_inode) \
|
| 923 | EXT4_INODE_SET_XTIME_VAL(i_atime, inode, raw_inode, inode_get_atime(inode))
|
| 924 |
|
| 925 | #define EXT4_INODE_SET_MTIME(inode, raw_inode) \
|
| 926 | EXT4_INODE_SET_XTIME_VAL(i_mtime, inode, raw_inode, inode_get_mtime(inode))
|
| 927 |
|
| 928 | #define EXT4_INODE_SET_CTIME(inode, raw_inode) \
|
| 929 | EXT4_INODE_SET_XTIME_VAL(i_ctime, inode, raw_inode, inode_get_ctime(inode))
|
| 930 |
|
| 931 | #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
|
| 932 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
|
| 933 | EXT4_INODE_SET_XTIME_VAL(xtime, &((einode)->vfs_inode), \
|
| 934 | raw_inode, (einode)->xtime)
|
| 935 |
|
| 936 | #define EXT4_INODE_GET_XTIME_VAL(xtime, inode, raw_inode) \
|
| 937 | (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra) ? \
|
| 938 | ext4_decode_extra_time((raw_inode)->xtime, \
|
| 939 | (raw_inode)->xtime ## _extra) : \
|
| 940 | (struct timespec64) { \
|
| 941 | .tv_sec = (signed)le32_to_cpu((raw_inode)->xtime) \
|
| 942 | })
|
| 943 |
|
| 944 | #define EXT4_INODE_GET_ATIME(inode, raw_inode) \
|
| 945 | do { \
|
| 946 | inode_set_atime_to_ts(inode, \
|
| 947 | EXT4_INODE_GET_XTIME_VAL(i_atime, inode, raw_inode)); \
|
| 948 | } while (0)
|
| 949 |
|
| 950 | #define EXT4_INODE_GET_MTIME(inode, raw_inode) \
|
| 951 | do { \
|
| 952 | inode_set_mtime_to_ts(inode, \
|
| 953 | EXT4_INODE_GET_XTIME_VAL(i_mtime, inode, raw_inode)); \
|
| 954 | } while (0)
|
| 955 |
|
| 956 | #define EXT4_INODE_GET_CTIME(inode, raw_inode) \
|
| 957 | do { \
|
| 958 | inode_set_ctime_to_ts(inode, \
|
| 959 | EXT4_INODE_GET_XTIME_VAL(i_ctime, inode, raw_inode)); \
|
| 960 | } while (0)
|
| 961 |
|
| 962 | #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
|
| 963 | do { \
|
| 964 | if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
|
| 965 | (einode)->xtime = \
|
| 966 | EXT4_INODE_GET_XTIME_VAL(xtime, &(einode->vfs_inode), \
|
| 967 | raw_inode); \
|
| 968 | else \
|
| 969 | (einode)->xtime = (struct timespec64){0, 0}; \
|
| 970 | } while (0)
|
| 971 |
|
| 972 | #define i_disk_version osd1.linux1.l_i_version
|
| 973 |
|
| 974 | #if defined(__KERNEL__) || defined(__linux__)
|
| 975 | #define i_reserved1 osd1.linux1.l_i_reserved1
|
| 976 | #define i_file_acl_high osd2.linux2.l_i_file_acl_high
|
| 977 | #define i_blocks_high osd2.linux2.l_i_blocks_high
|
| 978 | #define i_uid_low i_uid
|
| 979 | #define i_gid_low i_gid
|
| 980 | #define i_uid_high osd2.linux2.l_i_uid_high
|
| 981 | #define i_gid_high osd2.linux2.l_i_gid_high
|
| 982 | #define i_checksum_lo osd2.linux2.l_i_checksum_lo
|
| 983 |
|
| 984 | #elif defined(__GNU__)
|
| 985 |
|
| 986 | #define i_translator osd1.hurd1.h_i_translator
|
| 987 | #define i_uid_high osd2.hurd2.h_i_uid_high
|
| 988 | #define i_gid_high osd2.hurd2.h_i_gid_high
|
| 989 | #define i_author osd2.hurd2.h_i_author
|
| 990 |
|
| 991 | #elif defined(__masix__)
|
| 992 |
|
| 993 | #define i_reserved1 osd1.masix1.m_i_reserved1
|
| 994 | #define i_file_acl_high osd2.masix2.m_i_file_acl_high
|
| 995 | #define i_reserved2 osd2.masix2.m_i_reserved2
|
| 996 |
|
| 997 | #endif
|
| 998 |
|
| 999 | #include "extents_status.h"
|
| 1000 | #include "fast_commit.h"
|
| 1001 |
|
| 1002 | |
| 1003 | * Lock subclasses for i_data_sem in the ext4_inode_info structure.
|
| 1004 | *
|
| 1005 | * These are needed to avoid lockdep false positives when we need to
|
| 1006 | * allocate blocks to the quota inode during ext4_map_blocks(), while
|
| 1007 | * holding i_data_sem for a normal (non-quota) inode. Since we don't
|
| 1008 | * do quota tracking for the quota inode, this avoids deadlock (as
|
| 1009 | * well as infinite recursion, since it isn't turtles all the way
|
| 1010 | * down...)
|
| 1011 | *
|
| 1012 | * I_DATA_SEM_NORMAL - Used for most inodes
|
| 1013 | * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
|
| 1014 | * where the second inode has larger inode number
|
| 1015 | * than the first
|
| 1016 | * I_DATA_SEM_QUOTA - Used for quota inodes only
|
| 1017 | * I_DATA_SEM_EA - Used for ea_inodes only
|
| 1018 | * I_DATA_SEM_JOURNAL - Used for journal inode only
|
| 1019 |
|
| 1020 | enum {
|
| 1021 | I_DATA_SEM_NORMAL = 0,
|
| 1022 | I_DATA_SEM_OTHER,
|
| 1023 | I_DATA_SEM_QUOTA,
|
| 1024 | I_DATA_SEM_EA,
|
| 1025 | I_DATA_SEM_JOURNAL
|
| 1026 | };
|
| 1027 |
|
| 1028 | struct ext4_fc_inode_snap;
|
| 1029 |
|
| 1030 | |
| 1031 | * Snapshot failure reasons for ext4_fc_lock_updates tracepoint.
|
| 1032 | * Keep these stable for tooling.
|
| 1033 |
|
| 1034 | enum ext4_fc_snap_err {
|
| 1035 | EXT4_FC_SNAP_ERR_NONE = 0,
|
| 1036 | EXT4_FC_SNAP_ERR_ES_MISS,
|
| 1037 | EXT4_FC_SNAP_ERR_ES_DELAYED,
|
| 1038 | EXT4_FC_SNAP_ERR_ES_OTHER,
|
| 1039 | EXT4_FC_SNAP_ERR_INODES_CAP,
|
| 1040 | EXT4_FC_SNAP_ERR_RANGES_CAP,
|
| 1041 | EXT4_FC_SNAP_ERR_NOMEM,
|
| 1042 | EXT4_FC_SNAP_ERR_INODE_LOC,
|
| 1043 | };
|
| 1044 |
|
| 1045 | |
| 1046 | * fourth extended file system inode data in memory
|
| 1047 |
|
| 1048 | struct ext4_inode_info {
|
| 1049 | __le32 i_data[15];
|
| 1050 | __u32 i_dtime;
|
| 1051 | ext4_fsblk_t i_file_acl;
|
| 1052 |
|
| 1053 | |
| 1054 | * i_block_group is the number of the block group which contains
|
| 1055 | * this file's inode. Constant across the lifetime of the inode,
|
| 1056 | * it is used for making block allocation decisions - we try to
|
| 1057 | * place a file's data blocks near its inode block, and new inodes
|
| 1058 | * near to their parent directory's inode.
|
| 1059 |
|
| 1060 | ext4_group_t i_block_group;
|
| 1061 | ext4_lblk_t i_dir_start_lookup;
|
| 1062 | #if (BITS_PER_LONG < 64)
|
| 1063 | unsigned long i_state_flags;
|
| 1064 | #endif
|
| 1065 | unsigned long i_flags;
|
| 1066 |
|
| 1067 | |
| 1068 | * Extended attributes can be read independently of the main file
|
| 1069 | * data. Taking i_rwsem even when reading would cause contention
|
| 1070 | * between readers of EAs and writers of regular file data, so
|
| 1071 | * instead we synchronize on xattr_sem when reading or changing
|
| 1072 | * EAs.
|
| 1073 | *
|
| 1074 | * EA inodes (EXT4_EA_INODE_FL) do not use xattr_sem; they reuse
|
| 1075 | * the space for deferred iput linkage.
|
| 1076 |
|
| 1077 | union {
|
| 1078 | struct rw_semaphore xattr_sem;
|
| 1079 | struct llist_node i_ea_iput_node;
|
| 1080 | };
|
| 1081 |
|
| 1082 | |
| 1083 | * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
|
| 1084 | * i_orphan is used.
|
| 1085 |
|
| 1086 | union {
|
| 1087 | struct list_head i_orphan;
|
| 1088 | unsigned int i_orphan_idx;
|
| 1089 | };
|
| 1090 |
|
| 1091 |
|
| 1092 |
|
| 1093 |
|
| 1094 | struct list_head i_fc_dilist;
|
| 1095 | struct list_head i_fc_list; |
| 1096 | * inodes that need fast commit
|
| 1097 | * protected by sbi->s_fc_lock.
|
| 1098 |
|
| 1099 |
|
| 1100 |
|
| 1101 | ext4_lblk_t i_fc_lblk_start;
|
| 1102 |
|
| 1103 |
|
| 1104 | ext4_lblk_t i_fc_lblk_len;
|
| 1105 |
|
| 1106 | |
| 1107 | * Commit-time fast commit snapshots.
|
| 1108 | *
|
| 1109 | * i_fc_snap is installed and freed under sbi->s_fc_lock. The fast
|
| 1110 | * commit log writing path reads the snapshot under sbi->s_fc_lock while
|
| 1111 | * serializing fast commit TLVs.
|
| 1112 | *
|
| 1113 | * The snapshot lifetime is bounded by EXT4_STATE_FC_COMMITTING and the
|
| 1114 | * corresponding cleanup / eviction paths.
|
| 1115 | *
|
| 1116 | * i_fc_snap points to per-inode snapshot data for fast commit:
|
| 1117 | * - a raw inode snapshot for EXT4_FC_TAG_INODE
|
| 1118 | * - data range records for EXT4_FC_TAG_{ADD,DEL}_RANGE
|
| 1119 |
|
| 1120 | struct ext4_fc_inode_snap *i_fc_snap;
|
| 1121 |
|
| 1122 | spinlock_t i_raw_lock;
|
| 1123 |
|
| 1124 | |
| 1125 | * Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len
|
| 1126 | * and inode's EXT4_FC_STATE_COMMITTING state bit.
|
| 1127 |
|
| 1128 | spinlock_t i_fc_lock;
|
| 1129 |
|
| 1130 | |
| 1131 | * i_disksize keeps track of what the inode size is ON DISK, not
|
| 1132 | * in memory. During truncate, i_size is set to the new size by
|
| 1133 | * the VFS prior to calling ext4_truncate(), but the filesystem won't
|
| 1134 | * set i_disksize to 0 until the truncate is actually under way.
|
| 1135 | *
|
| 1136 | * The intent is that i_disksize always represents the blocks which
|
| 1137 | * are used by this file. This allows recovery to restart truncate
|
| 1138 | * on orphans if we crash during truncate. We actually write i_disksize
|
| 1139 | * into the on-disk inode when writing inodes out, instead of i_size.
|
| 1140 | *
|
| 1141 | * The only time when i_disksize and i_size may be different is when
|
| 1142 | * a truncate is in progress. The only things which change i_disksize
|
| 1143 | * are ext4_get_block (growth) and ext4_truncate (shrinkth).
|
| 1144 |
|
| 1145 | loff_t i_disksize;
|
| 1146 |
|
| 1147 | |
| 1148 | * i_data_sem is for serialising ext4_truncate() against
|
| 1149 | * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
|
| 1150 | * data tree are chopped off during truncate. We can't do that in
|
| 1151 | * ext4 because whenever we perform intermediate commits during
|
| 1152 | * truncate, the inode and all the metadata blocks *must* be in a
|
| 1153 | * consistent state which allows truncation of the orphans to restart
|
| 1154 | * during recovery. Hence we must fix the get_block-vs-truncate race
|
| 1155 | * by other means, so we have i_data_sem.
|
| 1156 |
|
| 1157 | struct rw_semaphore i_data_sem;
|
| 1158 | struct inode vfs_inode;
|
| 1159 | struct jbd2_inode *jinode;
|
| 1160 | struct mapping_metadata_bhs *i_metadata_bhs;
|
| 1161 |
|
| 1162 | |
| 1163 | * File creation time. Its function is same as that of
|
| 1164 | * struct timespec64 i_{a,c,m}time in the generic inode.
|
| 1165 |
|
| 1166 | struct timespec64 i_crtime;
|
| 1167 |
|
| 1168 |
|
| 1169 | atomic_t i_prealloc_active;
|
| 1170 |
|
| 1171 |
|
| 1172 |
|
| 1173 | unsigned int i_reserved_data_blocks;
|
| 1174 | struct rb_root i_prealloc_node;
|
| 1175 | rwlock_t i_prealloc_lock;
|
| 1176 |
|
| 1177 |
|
| 1178 | struct ext4_es_tree i_es_tree;
|
| 1179 | rwlock_t i_es_lock;
|
| 1180 | struct list_head i_es_list;
|
| 1181 | unsigned int i_es_all_nr;
|
| 1182 | unsigned int i_es_shk_nr;
|
| 1183 | ext4_lblk_t i_es_shrink_lblk; |
| 1184 | extents to shrink. Protected by
|
| 1185 | i_es_lock
|
| 1186 | u64 i_es_seq; |
| 1187 | Protected by i_es_lock
|
| 1188 |
|
| 1189 |
|
| 1190 | ext4_group_t i_last_alloc_group;
|
| 1191 |
|
| 1192 |
|
| 1193 | struct ext4_pending_tree i_pending_tree;
|
| 1194 |
|
| 1195 |
|
| 1196 | __u16 i_extra_isize;
|
| 1197 |
|
| 1198 |
|
| 1199 | u16 i_inline_off;
|
| 1200 | u16 i_inline_size;
|
| 1201 |
|
| 1202 | #ifdef CONFIG_QUOTA
|
| 1203 |
|
| 1204 | qsize_t i_reserved_quota;
|
| 1205 | #endif
|
| 1206 | spinlock_t i_block_reservation_lock;
|
| 1207 |
|
| 1208 |
|
| 1209 | spinlock_t i_completed_io_lock;
|
| 1210 | |
| 1211 | * Completed IOs that need unwritten extents handling and have
|
| 1212 | * transaction reserved
|
| 1213 |
|
| 1214 | struct list_head i_rsv_conversion_list;
|
| 1215 | struct work_struct i_rsv_conversion_work;
|
| 1216 |
|
| 1217 | |
| 1218 | * Transactions that contain inode's metadata needed to complete
|
| 1219 | * fsync and fdatasync, respectively.
|
| 1220 |
|
| 1221 | tid_t i_sync_tid;
|
| 1222 | tid_t i_datasync_tid;
|
| 1223 |
|
| 1224 | #ifdef CONFIG_QUOTA
|
| 1225 | struct dquot __rcu *i_dquot[MAXQUOTAS];
|
| 1226 | #endif
|
| 1227 |
|
| 1228 |
|
| 1229 | __u32 i_csum_seed;
|
| 1230 |
|
| 1231 | kprojid_t i_projid;
|
| 1232 |
|
| 1233 | #ifdef CONFIG_FS_ENCRYPTION
|
| 1234 | struct fscrypt_inode_info *i_crypt_info;
|
| 1235 | #endif
|
| 1236 | };
|
| 1237 |
|
| 1238 | |
| 1239 | * File system states
|
| 1240 |
|
| 1241 | #define EXT4_VALID_FS 0x0001
|
| 1242 | #define EXT4_ERROR_FS 0x0002
|
| 1243 | #define EXT4_ORPHAN_FS 0x0004
|
| 1244 | #define EXT4_FC_REPLAY 0x0020
|
| 1245 |
|
| 1246 | |
| 1247 | * Misc. filesystem flags
|
| 1248 |
|
| 1249 | #define EXT2_FLAGS_SIGNED_HASH 0x0001
|
| 1250 | #define EXT2_FLAGS_UNSIGNED_HASH 0x0002
|
| 1251 | #define EXT2_FLAGS_TEST_FILESYS 0x0004
|
| 1252 |
|
| 1253 | |
| 1254 | * Mount flags set via mount options or defaults
|
| 1255 |
|
| 1256 | #define EXT4_MOUNT_NO_MBCACHE 0x00001
|
| 1257 | #define EXT4_MOUNT_GRPID 0x00004
|
| 1258 | #define EXT4_MOUNT_DEBUG 0x00008
|
| 1259 | #define EXT4_MOUNT_ERRORS_CONT 0x00010
|
| 1260 | #define EXT4_MOUNT_ERRORS_RO 0x00020
|
| 1261 | #define EXT4_MOUNT_ERRORS_PANIC 0x00040
|
| 1262 | #define EXT4_MOUNT_ERRORS_MASK 0x00070
|
| 1263 | #define EXT4_MOUNT_MINIX_DF 0x00080
|
| 1264 | #define EXT4_MOUNT_NOLOAD 0x00100
|
| 1265 | #ifdef CONFIG_FS_DAX
|
| 1266 | #define EXT4_MOUNT_DAX_ALWAYS 0x00200
|
| 1267 | #else
|
| 1268 | #define EXT4_MOUNT_DAX_ALWAYS 0
|
| 1269 | #endif
|
| 1270 | #define EXT4_MOUNT_DATA_FLAGS 0x00C00
|
| 1271 | #define EXT4_MOUNT_JOURNAL_DATA 0x00400
|
| 1272 | #define EXT4_MOUNT_ORDERED_DATA 0x00800
|
| 1273 | #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00
|
| 1274 | #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000
|
| 1275 | #define EXT4_MOUNT_NO_UID32 0x02000
|
| 1276 | #define EXT4_MOUNT_XATTR_USER 0x04000
|
| 1277 | #define EXT4_MOUNT_POSIX_ACL 0x08000
|
| 1278 | #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000
|
| 1279 | #define EXT4_MOUNT_BARRIER 0x20000
|
| 1280 | #define EXT4_MOUNT_QUOTA 0x40000
|
| 1281 | #define EXT4_MOUNT_USRQUOTA 0x80000 |
| 1282 | * enable enforcement for hidden
|
| 1283 | * quota files
|
| 1284 | #define EXT4_MOUNT_GRPQUOTA 0x100000 |
| 1285 | * enforcement for hidden quota
|
| 1286 | * files
|
| 1287 | #define EXT4_MOUNT_PRJQUOTA 0x200000 |
| 1288 | * enforcement
|
| 1289 | #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000
|
| 1290 | #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000
|
| 1291 | #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000
|
| 1292 | #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000
|
| 1293 | #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
|
| 1294 | #define EXT4_MOUNT_DELALLOC 0x8000000
|
| 1295 | #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000
|
| 1296 | #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000
|
| 1297 | #define EXT4_MOUNT_DISCARD 0x40000000
|
| 1298 | #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000
|
| 1299 |
|
| 1300 | |
| 1301 | * Mount flags set either automatically (could not be set by mount option)
|
| 1302 | * based on per file system feature or property or in special cases such as
|
| 1303 | * distinguishing between explicit mount option definition and default.
|
| 1304 |
|
| 1305 | #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 |
| 1306 | specified delalloc
|
| 1307 | #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 |
| 1308 | size of blocksize * 8
|
| 1309 | blocks
|
| 1310 | #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 |
| 1311 | file systems
|
| 1312 | #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 |
| 1313 | specified journal checksum
|
| 1314 |
|
| 1315 | #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010
|
| 1316 | #define EXT4_MOUNT2_DAX_NEVER 0x00000020
|
| 1317 | #define EXT4_MOUNT2_DAX_INODE 0x00000040
|
| 1318 | #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 |
| 1319 | * scanning in mballoc
|
| 1320 |
|
| 1321 | #define EXT4_MOUNT2_ABORT 0x00000100
|
| 1322 |
|
| 1323 | #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
|
| 1324 | ~EXT4_MOUNT_##opt
|
| 1325 | #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
|
| 1326 | EXT4_MOUNT_##opt
|
| 1327 | #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
|
| 1328 | EXT4_MOUNT_##opt)
|
| 1329 |
|
| 1330 | #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
|
| 1331 | ~EXT4_MOUNT2_##opt
|
| 1332 | #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
|
| 1333 | EXT4_MOUNT2_##opt
|
| 1334 | #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
|
| 1335 | EXT4_MOUNT2_##opt)
|
| 1336 |
|
| 1337 | #define ext4_test_and_set_bit __test_and_set_bit_le
|
| 1338 | #define ext4_set_bit __set_bit_le
|
| 1339 | #define ext4_test_and_clear_bit __test_and_clear_bit_le
|
| 1340 | #define ext4_clear_bit __clear_bit_le
|
| 1341 | #define ext4_test_bit test_bit_le
|
| 1342 | #define ext4_find_next_zero_bit find_next_zero_bit_le
|
| 1343 | #define ext4_find_next_bit find_next_bit_le
|
| 1344 |
|
| 1345 | extern void mb_set_bits(void *bm, int cur, int len);
|
| 1346 |
|
| 1347 | |
| 1348 | * Maximal mount counts between two filesystem checks
|
| 1349 |
|
| 1350 | #define EXT4_DFL_MAX_MNT_COUNT 20
|
| 1351 | #define EXT4_DFL_CHECKINTERVAL 0
|
| 1352 |
|
| 1353 | |
| 1354 | * Behaviour when detecting errors
|
| 1355 |
|
| 1356 | #define EXT4_ERRORS_CONTINUE 1
|
| 1357 | #define EXT4_ERRORS_RO 2
|
| 1358 | #define EXT4_ERRORS_PANIC 3
|
| 1359 | #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
|
| 1360 |
|
| 1361 |
|
| 1362 | #define EXT4_CRC32C_CHKSUM 1
|
| 1363 |
|
| 1364 | #define EXT4_LABEL_MAX 16
|
| 1365 |
|
| 1366 | |
| 1367 | * Structure of the super block
|
| 1368 |
|
| 1369 | struct ext4_super_block {
|
| 1370 | __le32 s_inodes_count;
|
| 1371 | __le32 s_blocks_count_lo;
|
| 1372 | __le32 s_r_blocks_count_lo;
|
| 1373 | __le32 s_free_blocks_count_lo;
|
| 1374 | __le32 s_free_inodes_count;
|
| 1375 | __le32 s_first_data_block;
|
| 1376 | __le32 s_log_block_size;
|
| 1377 | __le32 s_log_cluster_size;
|
| 1378 | __le32 s_blocks_per_group;
|
| 1379 | __le32 s_clusters_per_group;
|
| 1380 | __le32 s_inodes_per_group;
|
| 1381 | __le32 s_mtime;
|
| 1382 | __le32 s_wtime;
|
| 1383 | __le16 s_mnt_count;
|
| 1384 | __le16 s_max_mnt_count;
|
| 1385 | __le16 s_magic;
|
| 1386 | __le16 s_state;
|
| 1387 | __le16 s_errors;
|
| 1388 | __le16 s_minor_rev_level;
|
| 1389 | __le32 s_lastcheck;
|
| 1390 | __le32 s_checkinterval;
|
| 1391 | __le32 s_creator_os;
|
| 1392 | __le32 s_rev_level;
|
| 1393 | __le16 s_def_resuid;
|
| 1394 | __le16 s_def_resgid;
|
| 1395 | |
| 1396 | * These fields are for EXT4_DYNAMIC_REV superblocks only.
|
| 1397 | *
|
| 1398 | * Note: the difference between the compatible feature set and
|
| 1399 | * the incompatible feature set is that if there is a bit set
|
| 1400 | * in the incompatible feature set that the kernel doesn't
|
| 1401 | * know about, it should refuse to mount the filesystem.
|
| 1402 | *
|
| 1403 | * e2fsck's requirements are more strict; if it doesn't know
|
| 1404 | * about a feature in either the compatible or incompatible
|
| 1405 | * feature set, it must abort and not try to meddle with
|
| 1406 | * things it doesn't understand...
|
| 1407 |
|
| 1408 | __le32 s_first_ino;
|
| 1409 | __le16 s_inode_size;
|
| 1410 | __le16 s_block_group_nr;
|
| 1411 | __le32 s_feature_compat;
|
| 1412 | __le32 s_feature_incompat;
|
| 1413 | __le32 s_feature_ro_compat;
|
| 1414 | __u8 s_uuid[16];
|
| 1415 | char s_volume_name[EXT4_LABEL_MAX] __nonstring;
|
| 1416 | char s_last_mounted[64] __nonstring;
|
| 1417 | __le32 s_algorithm_usage_bitmap;
|
| 1418 | |
| 1419 | * Performance hints. Directory preallocation should only
|
| 1420 | * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
|
| 1421 |
|
| 1422 | __u8 s_prealloc_blocks;
|
| 1423 | __u8 s_prealloc_dir_blocks;
|
| 1424 | __le16 s_reserved_gdt_blocks;
|
| 1425 | |
| 1426 | * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
|
| 1427 |
|
| 1428 | __u8 s_journal_uuid[16];
|
| 1429 | __le32 s_journal_inum;
|
| 1430 | __le32 s_journal_dev;
|
| 1431 | __le32 s_last_orphan;
|
| 1432 | __le32 s_hash_seed[4];
|
| 1433 | __u8 s_def_hash_version;
|
| 1434 | __u8 s_jnl_backup_type;
|
| 1435 | __le16 s_desc_size;
|
| 1436 | __le32 s_default_mount_opts;
|
| 1437 | __le32 s_first_meta_bg;
|
| 1438 | __le32 s_mkfs_time;
|
| 1439 | __le32 s_jnl_blocks[17];
|
| 1440 |
|
| 1441 | __le32 s_blocks_count_hi;
|
| 1442 | __le32 s_r_blocks_count_hi;
|
| 1443 | __le32 s_free_blocks_count_hi;
|
| 1444 | __le16 s_min_extra_isize;
|
| 1445 | __le16 s_want_extra_isize;
|
| 1446 | __le32 s_flags;
|
| 1447 | __le16 s_raid_stride;
|
| 1448 | __le16 s_mmp_update_interval;
|
| 1449 | __le64 s_mmp_block;
|
| 1450 | __le32 s_raid_stripe_width;
|
| 1451 | __u8 s_log_groups_per_flex;
|
| 1452 | __u8 s_checksum_type;
|
| 1453 | __u8 s_encryption_level;
|
| 1454 | __u8 s_reserved_pad;
|
| 1455 | __le64 s_kbytes_written;
|
| 1456 | __le32 s_snapshot_inum;
|
| 1457 | __le32 s_snapshot_id;
|
| 1458 | __le64 s_snapshot_r_blocks_count; |
| 1459 | snapshot's future use
|
| 1460 | __le32 s_snapshot_list; |
| 1461 | on-disk snapshot list
|
| 1462 | #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
|
| 1463 | __le32 s_error_count;
|
| 1464 | __le32 s_first_error_time;
|
| 1465 | __le32 s_first_error_ino;
|
| 1466 | __le64 s_first_error_block;
|
| 1467 | __u8 s_first_error_func[32] __nonstring;
|
| 1468 | __le32 s_first_error_line;
|
| 1469 | __le32 s_last_error_time;
|
| 1470 | __le32 s_last_error_ino;
|
| 1471 | __le32 s_last_error_line;
|
| 1472 | __le64 s_last_error_block;
|
| 1473 | __u8 s_last_error_func[32] __nonstring;
|
| 1474 | #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
|
| 1475 | __u8 s_mount_opts[64];
|
| 1476 | __le32 s_usr_quota_inum;
|
| 1477 | __le32 s_grp_quota_inum;
|
| 1478 | __le32 s_overhead_clusters;
|
| 1479 | __le32 s_backup_bgs[2];
|
| 1480 | __u8 s_encrypt_algos[4];
|
| 1481 | __u8 s_encrypt_pw_salt[16];
|
| 1482 | __le32 s_lpf_ino;
|
| 1483 | __le32 s_prj_quota_inum;
|
| 1484 | __le32 s_checksum_seed;
|
| 1485 | __u8 s_wtime_hi;
|
| 1486 | __u8 s_mtime_hi;
|
| 1487 | __u8 s_mkfs_time_hi;
|
| 1488 | __u8 s_lastcheck_hi;
|
| 1489 | __u8 s_first_error_time_hi;
|
| 1490 | __u8 s_last_error_time_hi;
|
| 1491 | __u8 s_first_error_errcode;
|
| 1492 | __u8 s_last_error_errcode;
|
| 1493 | __le16 s_encoding;
|
| 1494 | __le16 s_encoding_flags;
|
| 1495 | __le32 s_orphan_file_inum;
|
| 1496 | __le16 s_def_resuid_hi;
|
| 1497 | __le16 s_def_resgid_hi;
|
| 1498 | __le32 s_reserved[93];
|
| 1499 | __le32 s_checksum;
|
| 1500 | };
|
| 1501 |
|
| 1502 | #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
|
| 1503 |
|
| 1504 | #ifdef __KERNEL__
|
| 1505 |
|
| 1506 |
|
| 1507 | #define EXT4_MAXQUOTAS 3
|
| 1508 |
|
| 1509 | #define EXT4_ENC_UTF8_12_1 1
|
| 1510 |
|
| 1511 |
|
| 1512 | enum ext4_journal_trigger_type {
|
| 1513 | EXT4_JTR_ORPHAN_FILE,
|
| 1514 | EXT4_JTR_NONE
|
| 1515 | };
|
| 1516 |
|
| 1517 | #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
|
| 1518 |
|
| 1519 | struct ext4_journal_trigger {
|
| 1520 | struct jbd2_buffer_trigger_type tr_triggers;
|
| 1521 | struct super_block *sb;
|
| 1522 | };
|
| 1523 |
|
| 1524 | static inline struct ext4_journal_trigger *EXT4_TRIGGER(
|
| 1525 | struct jbd2_buffer_trigger_type *trigger)
|
| 1526 | {
|
| 1527 | return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
|
| 1528 | }
|
| 1529 |
|
| 1530 | #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
|
| 1531 |
|
| 1532 |
|
| 1533 | struct ext4_orphan_block_tail {
|
| 1534 | __le32 ob_magic;
|
| 1535 | __le32 ob_checksum;
|
| 1536 | };
|
| 1537 |
|
| 1538 | static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
|
| 1539 | {
|
| 1540 | return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
|
| 1541 | sizeof(u32);
|
| 1542 | }
|
| 1543 |
|
| 1544 | struct ext4_orphan_block {
|
| 1545 | atomic_t ob_free_entries;
|
| 1546 | struct buffer_head *ob_bh;
|
| 1547 | };
|
| 1548 |
|
| 1549 | |
| 1550 | * Info about orphan file.
|
| 1551 |
|
| 1552 | struct ext4_orphan_info {
|
| 1553 | int of_blocks;
|
| 1554 | __u32 of_csum_seed;
|
| 1555 | struct ext4_orphan_block *of_binfo; |
| 1556 | * file blocks
|
| 1557 | };
|
| 1558 |
|
| 1559 | |
| 1560 | * Ext4 fast commit snapshot statistics.
|
| 1561 | *
|
| 1562 | * These are best-effort counters intended for debugging / performance
|
| 1563 | * introspection; they are not exact under concurrent updates.
|
| 1564 |
|
| 1565 | struct ext4_fc_snap_stats {
|
| 1566 | atomic64_t lock_updates_ns_total;
|
| 1567 | atomic64_t lock_updates_ns_max;
|
| 1568 | atomic64_t lock_updates_samples;
|
| 1569 |
|
| 1570 | atomic64_t snap_inodes;
|
| 1571 | atomic64_t snap_ranges;
|
| 1572 |
|
| 1573 | atomic64_t snap_fail_es_miss;
|
| 1574 | atomic64_t snap_fail_es_delayed;
|
| 1575 | atomic64_t snap_fail_es_other;
|
| 1576 |
|
| 1577 | atomic64_t snap_fail_inodes_cap;
|
| 1578 | atomic64_t snap_fail_ranges_cap;
|
| 1579 | atomic64_t snap_fail_nomem;
|
| 1580 | atomic64_t snap_fail_inode_loc;
|
| 1581 |
|
| 1582 | |
| 1583 | * Missing inode snapshots during log writing should never happen.
|
| 1584 | * Keep this counter to help catch unexpected regressions.
|
| 1585 |
|
| 1586 | atomic64_t snap_fail_no_snap;
|
| 1587 | };
|
| 1588 |
|
| 1589 | |
| 1590 | * fourth extended-fs super-block data in memory
|
| 1591 |
|
| 1592 | struct ext4_sb_info {
|
| 1593 | unsigned long s_desc_size;
|
| 1594 | unsigned long s_inodes_per_block;
|
| 1595 | unsigned long s_blocks_per_group;
|
| 1596 | unsigned long s_clusters_per_group;
|
| 1597 | unsigned long s_inodes_per_group;
|
| 1598 | unsigned long s_itb_per_group;
|
| 1599 | unsigned long s_gdb_count;
|
| 1600 | unsigned long s_desc_per_block;
|
| 1601 | ext4_group_t s_groups_count;
|
| 1602 | ext4_group_t s_blockfile_groups;
|
| 1603 | unsigned long s_overhead;
|
| 1604 | unsigned int s_cluster_ratio;
|
| 1605 | unsigned int s_cluster_bits;
|
| 1606 | loff_t s_bitmap_maxbytes;
|
| 1607 | struct buffer_head * s_sbh;
|
| 1608 | struct ext4_super_block *s_es;
|
| 1609 |
|
| 1610 | struct buffer_head * __rcu *s_group_desc;
|
| 1611 | unsigned int s_mount_opt;
|
| 1612 | unsigned int s_mount_opt2;
|
| 1613 | unsigned long s_mount_flags;
|
| 1614 | unsigned int s_def_mount_opt;
|
| 1615 | unsigned int s_def_mount_opt2;
|
| 1616 | ext4_fsblk_t s_sb_block;
|
| 1617 | atomic64_t s_resv_clusters;
|
| 1618 | kuid_t s_resuid;
|
| 1619 | kgid_t s_resgid;
|
| 1620 | unsigned short s_mount_state;
|
| 1621 | unsigned short s_pad;
|
| 1622 | int s_addr_per_block_bits;
|
| 1623 | int s_desc_per_block_bits;
|
| 1624 | int s_inode_size;
|
| 1625 | int s_first_ino;
|
| 1626 | unsigned int s_inode_readahead_blks;
|
| 1627 | unsigned int s_inode_goal;
|
| 1628 | u32 s_hash_seed[4];
|
| 1629 | int s_def_hash_version;
|
| 1630 | int s_hash_unsigned;
|
| 1631 | struct percpu_counter s_freeclusters_counter;
|
| 1632 | struct percpu_counter s_freeinodes_counter;
|
| 1633 | struct percpu_counter s_dirs_counter;
|
| 1634 | struct percpu_counter s_dirtyclusters_counter;
|
| 1635 | struct percpu_counter s_sra_exceeded_retry_limit;
|
| 1636 | struct blockgroup_lock *s_blockgroup_lock;
|
| 1637 | struct proc_dir_entry *s_proc;
|
| 1638 | struct kobject s_kobj;
|
| 1639 | struct completion s_kobj_unregister;
|
| 1640 | struct mutex s_error_notify_mutex;
|
| 1641 | struct super_block *s_sb;
|
| 1642 | struct buffer_head *s_mmp_bh;
|
| 1643 |
|
| 1644 |
|
| 1645 | struct journal_s *s_journal;
|
| 1646 | unsigned long s_ext4_flags;
|
| 1647 | struct mutex s_orphan_lock;
|
| 1648 | struct list_head s_orphan; |
| 1649 | list
|
| 1650 | struct ext4_orphan_info s_orphan_info;
|
| 1651 | unsigned long s_commit_interval;
|
| 1652 | u32 s_max_batch_time;
|
| 1653 | u32 s_min_batch_time;
|
| 1654 | struct file *s_journal_bdev_file;
|
| 1655 | #ifdef CONFIG_QUOTA
|
| 1656 |
|
| 1657 | char __rcu *s_qf_names[EXT4_MAXQUOTAS];
|
| 1658 | int s_jquota_fmt;
|
| 1659 | #endif
|
| 1660 | unsigned int s_want_extra_isize;
|
| 1661 | struct ext4_system_blocks __rcu *s_system_blks;
|
| 1662 |
|
| 1663 | #ifdef EXTENTS_STATS
|
| 1664 |
|
| 1665 | unsigned long s_ext_min;
|
| 1666 | unsigned long s_ext_max;
|
| 1667 | unsigned long s_depth_max;
|
| 1668 | spinlock_t s_ext_stats_lock;
|
| 1669 | unsigned long s_ext_blocks;
|
| 1670 | unsigned long s_ext_extents;
|
| 1671 | #endif
|
| 1672 |
|
| 1673 |
|
| 1674 | struct ext4_group_info ** __rcu *s_group_info;
|
| 1675 | struct inode *s_buddy_cache;
|
| 1676 | spinlock_t s_md_lock;
|
| 1677 | unsigned short *s_mb_offsets;
|
| 1678 | unsigned int *s_mb_maxs;
|
| 1679 | unsigned int s_group_info_size;
|
| 1680 | atomic_t s_mb_free_pending;
|
| 1681 | struct list_head s_freed_data_list[2]; |
| 1682 | after commit completed
|
| 1683 | struct list_head s_discard_list;
|
| 1684 | struct work_struct s_discard_work;
|
| 1685 | atomic_t s_retry_alloc_pending;
|
| 1686 | struct xarray *s_mb_avg_fragment_size;
|
| 1687 | struct xarray *s_mb_largest_free_orders;
|
| 1688 |
|
| 1689 |
|
| 1690 | unsigned long s_stripe;
|
| 1691 | unsigned int s_mb_max_linear_groups;
|
| 1692 | unsigned int s_mb_stream_request;
|
| 1693 | unsigned int s_mb_max_to_scan;
|
| 1694 | unsigned int s_mb_min_to_scan;
|
| 1695 | unsigned int s_mb_stats;
|
| 1696 | unsigned int s_mb_order2_reqs;
|
| 1697 | unsigned int s_mb_group_prealloc;
|
| 1698 | unsigned int s_max_dir_size_kb;
|
| 1699 | unsigned int s_mb_prefetch;
|
| 1700 | unsigned int s_mb_prefetch_limit;
|
| 1701 | unsigned int s_mb_best_avail_max_trim_order;
|
| 1702 | unsigned int s_sb_update_sec;
|
| 1703 | unsigned int s_sb_update_kb;
|
| 1704 |
|
| 1705 |
|
| 1706 | ext4_group_t *s_mb_last_groups;
|
| 1707 | unsigned int s_mb_nr_global_goals;
|
| 1708 |
|
| 1709 |
|
| 1710 | atomic_t s_bal_reqs;
|
| 1711 | atomic_t s_bal_success;
|
| 1712 | atomic_t s_bal_allocated;
|
| 1713 | atomic_t s_bal_ex_scanned;
|
| 1714 | atomic_t s_bal_cX_ex_scanned[EXT4_MB_NUM_CRS];
|
| 1715 | atomic_t s_bal_groups_scanned;
|
| 1716 | atomic_t s_bal_goals;
|
| 1717 | atomic_t s_bal_stream_goals;
|
| 1718 | atomic_t s_bal_len_goals;
|
| 1719 | atomic_t s_bal_breaks;
|
| 1720 | atomic_t s_bal_2orders;
|
| 1721 | atomic64_t s_bal_cX_groups_considered[EXT4_MB_NUM_CRS];
|
| 1722 | atomic64_t s_bal_cX_hits[EXT4_MB_NUM_CRS];
|
| 1723 | atomic64_t s_bal_cX_failed[EXT4_MB_NUM_CRS];
|
| 1724 | atomic_t s_mb_buddies_generated;
|
| 1725 | atomic64_t s_mb_generation_time;
|
| 1726 | atomic_t s_mb_lost_chunks;
|
| 1727 | atomic_t s_mb_preallocated;
|
| 1728 | atomic_t s_mb_discarded;
|
| 1729 | atomic_t s_lock_busy;
|
| 1730 |
|
| 1731 |
|
| 1732 | struct ext4_locality_group __percpu *s_locality_groups;
|
| 1733 |
|
| 1734 |
|
| 1735 | unsigned long s_sectors_written_start;
|
| 1736 | u64 s_kbytes_written;
|
| 1737 |
|
| 1738 |
|
| 1739 | unsigned int s_extent_max_zeroout_kb;
|
| 1740 |
|
| 1741 | unsigned int s_log_groups_per_flex;
|
| 1742 | struct flex_groups * __rcu *s_flex_groups;
|
| 1743 | ext4_group_t s_flex_groups_allocated;
|
| 1744 |
|
| 1745 |
|
| 1746 | struct workqueue_struct *rsv_conversion_wq;
|
| 1747 |
|
| 1748 |
|
| 1749 | struct timer_list s_err_report;
|
| 1750 |
|
| 1751 | unsigned long s_err_report_sec;
|
| 1752 |
|
| 1753 |
|
| 1754 | struct ext4_li_request *s_li_request;
|
| 1755 |
|
| 1756 | unsigned int s_li_wait_mult;
|
| 1757 |
|
| 1758 |
|
| 1759 | struct task_struct *s_mmp_tsk;
|
| 1760 |
|
| 1761 |
|
| 1762 | unsigned long s_last_trim_minblks;
|
| 1763 |
|
| 1764 |
|
| 1765 | u16 s_min_folio_order;
|
| 1766 |
|
| 1767 | u16 s_max_folio_order;
|
| 1768 |
|
| 1769 |
|
| 1770 | __u32 s_csum_seed;
|
| 1771 |
|
| 1772 |
|
| 1773 | struct shrinker *s_es_shrinker;
|
| 1774 | struct list_head s_es_list;
|
| 1775 | long s_es_nr_inode;
|
| 1776 | struct ext4_es_stats s_es_stats;
|
| 1777 |
|
| 1778 | struct rcu_head s_rcu;
|
| 1779 | struct mb_cache *s_ea_block_cache;
|
| 1780 | struct mb_cache *s_ea_inode_cache;
|
| 1781 |
|
| 1782 |
|
| 1783 | struct llist_head s_ea_inode_to_free;
|
| 1784 | struct delayed_work s_ea_inode_work;
|
| 1785 |
|
| 1786 | spinlock_t s_es_lock ____cacheline_aligned_in_smp;
|
| 1787 |
|
| 1788 |
|
| 1789 | struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
|
| 1790 |
|
| 1791 |
|
| 1792 | struct ratelimit_state s_err_ratelimit_state;
|
| 1793 | struct ratelimit_state s_warning_ratelimit_state;
|
| 1794 | struct ratelimit_state s_msg_ratelimit_state;
|
| 1795 | atomic_t s_warning_count;
|
| 1796 | atomic_t s_msg_count;
|
| 1797 |
|
| 1798 |
|
| 1799 | struct fscrypt_dummy_policy s_dummy_enc_policy;
|
| 1800 |
|
| 1801 | |
| 1802 | * Barrier between writepages ops and changing any inode's JOURNAL_DATA
|
| 1803 | * or EXTENTS flag or between writepages ops and changing DELALLOC or
|
| 1804 | * DIOREAD_NOLOCK mount options on remount.
|
| 1805 |
|
| 1806 | struct percpu_rw_semaphore s_writepages_rwsem;
|
| 1807 | struct dax_device *s_daxdev;
|
| 1808 | u64 s_dax_part_off;
|
| 1809 | #ifdef CONFIG_EXT4_DEBUG
|
| 1810 | unsigned long s_simulate_fail;
|
| 1811 | #endif
|
| 1812 |
|
| 1813 | errseq_t s_bdev_wb_err;
|
| 1814 | spinlock_t s_bdev_wb_lock;
|
| 1815 |
|
| 1816 |
|
| 1817 | spinlock_t s_error_lock;
|
| 1818 | int s_add_error_count;
|
| 1819 | int s_first_error_code;
|
| 1820 | __u32 s_first_error_line;
|
| 1821 | __u32 s_first_error_ino;
|
| 1822 | __u64 s_first_error_block;
|
| 1823 | const char *s_first_error_func;
|
| 1824 | time64_t s_first_error_time;
|
| 1825 | int s_last_error_code;
|
| 1826 | __u32 s_last_error_line;
|
| 1827 | __u32 s_last_error_ino;
|
| 1828 | __u64 s_last_error_block;
|
| 1829 | const char *s_last_error_func;
|
| 1830 | time64_t s_last_error_time;
|
| 1831 | |
| 1832 | * If we are in a context where we cannot update the on-disk
|
| 1833 | * superblock, we queue the work here. This is used to update
|
| 1834 | * the error information in the superblock, and for periodic
|
| 1835 | * updates of the superblock called from the commit callback
|
| 1836 | * function.
|
| 1837 |
|
| 1838 | struct work_struct s_sb_upd_work;
|
| 1839 |
|
| 1840 |
|
| 1841 | unsigned int s_awu_min;
|
| 1842 | unsigned int s_awu_max;
|
| 1843 |
|
| 1844 |
|
| 1845 | atomic_t s_fc_subtid;
|
| 1846 |
|
| 1847 | |
| 1848 | * After commit starts, the main queue gets locked, and the further
|
| 1849 | * updates get added in the staging queue.
|
| 1850 |
|
| 1851 | #define FC_Q_MAIN 0
|
| 1852 | #define FC_Q_STAGING 1
|
| 1853 | struct list_head s_fc_q[2]; |
| 1854 | * that have data changes in them.
|
| 1855 |
|
| 1856 | struct list_head s_fc_dentry_q[2];
|
| 1857 | unsigned int s_fc_bytes;
|
| 1858 | |
| 1859 | * Main fast commit lock. This lock protects accesses to the
|
| 1860 | * following fields:
|
| 1861 | * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
|
| 1862 | *
|
| 1863 | * s_fc_lock can be taken from reclaim context (inode eviction) and is
|
| 1864 | * thus reclaim unsafe. Use ext4_fc_lock()/ext4_fc_unlock() helpers
|
| 1865 | * when acquiring / releasing the lock.
|
| 1866 |
|
| 1867 | struct mutex s_fc_lock;
|
| 1868 | struct buffer_head *s_fc_bh;
|
| 1869 | struct ext4_fc_stats s_fc_stats;
|
| 1870 | struct ext4_fc_snap_stats s_fc_snap_stats;
|
| 1871 | tid_t s_fc_ineligible_tid;
|
| 1872 | #ifdef CONFIG_EXT4_DEBUG
|
| 1873 | int s_fc_debug_max_replay;
|
| 1874 | #endif
|
| 1875 | struct ext4_fc_replay_state s_fc_replay_state;
|
| 1876 | };
|
| 1877 |
|
| 1878 | static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
|
| 1879 | {
|
| 1880 | return sb->s_fs_info;
|
| 1881 | }
|
| 1882 | static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
|
| 1883 | {
|
| 1884 | return container_of(inode, struct ext4_inode_info, vfs_inode);
|
| 1885 | }
|
| 1886 |
|
| 1887 | static inline int ext4_writepages_down_read(struct super_block *sb)
|
| 1888 | {
|
| 1889 | percpu_down_read(&EXT4_SB(sb)->s_writepages_rwsem);
|
| 1890 | return memalloc_nofs_save();
|
| 1891 | }
|
| 1892 |
|
| 1893 | static inline void ext4_writepages_up_read(struct super_block *sb, int ctx)
|
| 1894 | {
|
| 1895 | memalloc_nofs_restore(ctx);
|
| 1896 | percpu_up_read(&EXT4_SB(sb)->s_writepages_rwsem);
|
| 1897 | }
|
| 1898 |
|
| 1899 | static inline int ext4_writepages_down_write(struct super_block *sb)
|
| 1900 | {
|
| 1901 | percpu_down_write(&EXT4_SB(sb)->s_writepages_rwsem);
|
| 1902 | return memalloc_nofs_save();
|
| 1903 | }
|
| 1904 |
|
| 1905 | static inline void ext4_writepages_up_write(struct super_block *sb, int ctx)
|
| 1906 | {
|
| 1907 | memalloc_nofs_restore(ctx);
|
| 1908 | percpu_up_write(&EXT4_SB(sb)->s_writepages_rwsem);
|
| 1909 | }
|
| 1910 |
|
| 1911 | static inline int ext4_fc_lock(struct super_block *sb)
|
| 1912 | {
|
| 1913 | mutex_lock(&EXT4_SB(sb)->s_fc_lock);
|
| 1914 | return memalloc_nofs_save();
|
| 1915 | }
|
| 1916 |
|
| 1917 | static inline void ext4_fc_unlock(struct super_block *sb, int ctx)
|
| 1918 | {
|
| 1919 | memalloc_nofs_restore(ctx);
|
| 1920 | mutex_unlock(&EXT4_SB(sb)->s_fc_lock);
|
| 1921 | }
|
| 1922 |
|
| 1923 | static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
|
| 1924 | {
|
| 1925 | return ino == EXT4_ROOT_INO ||
|
| 1926 | (ino >= EXT4_FIRST_INO(sb) &&
|
| 1927 | ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
|
| 1928 | }
|
| 1929 |
|
| 1930 | static inline int ext4_get_resuid(struct ext4_super_block *es)
|
| 1931 | {
|
| 1932 | return le16_to_cpu(es->s_def_resuid) |
|
| 1933 | le16_to_cpu(es->s_def_resuid_hi) << 16;
|
| 1934 | }
|
| 1935 |
|
| 1936 | static inline int ext4_get_resgid(struct ext4_super_block *es)
|
| 1937 | {
|
| 1938 | return le16_to_cpu(es->s_def_resgid) |
|
| 1939 | le16_to_cpu(es->s_def_resgid_hi) << 16;
|
| 1940 | }
|
| 1941 |
|
| 1942 | |
| 1943 | * Returns: sbi->field[index]
|
| 1944 | * Used to access an array element from the following sbi fields which require
|
| 1945 | * rcu protection to avoid dereferencing an invalid pointer due to reassignment
|
| 1946 | * - s_group_desc
|
| 1947 | * - s_group_info
|
| 1948 | * - s_flex_group
|
| 1949 |
|
| 1950 | #define sbi_array_rcu_deref(sbi, field, index) \
|
| 1951 | ({ \
|
| 1952 | typeof(*((sbi)->field)) _v; \
|
| 1953 | rcu_read_lock(); \
|
| 1954 | _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
|
| 1955 | rcu_read_unlock(); \
|
| 1956 | _v; \
|
| 1957 | })
|
| 1958 |
|
| 1959 | |
| 1960 | * run-time mount flags
|
| 1961 |
|
| 1962 | enum {
|
| 1963 | EXT4_MF_MNTDIR_SAMPLED,
|
| 1964 | EXT4_MF_FC_INELIGIBLE,
|
| 1965 | EXT4_MF_JOURNAL_DESTROY
|
| 1966 | };
|
| 1967 |
|
| 1968 | static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
|
| 1969 | {
|
| 1970 | set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
|
| 1971 | }
|
| 1972 |
|
| 1973 | static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
|
| 1974 | {
|
| 1975 | clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
|
| 1976 | }
|
| 1977 |
|
| 1978 | static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
|
| 1979 | {
|
| 1980 | return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
|
| 1981 | }
|
| 1982 |
|
| 1983 |
|
| 1984 | |
| 1985 | * Simulate_fail codes
|
| 1986 |
|
| 1987 | #define EXT4_SIM_BBITMAP_EIO 1
|
| 1988 | #define EXT4_SIM_BBITMAP_CRC 2
|
| 1989 | #define EXT4_SIM_IBITMAP_EIO 3
|
| 1990 | #define EXT4_SIM_IBITMAP_CRC 4
|
| 1991 | #define EXT4_SIM_INODE_EIO 5
|
| 1992 | #define EXT4_SIM_INODE_CRC 6
|
| 1993 | #define EXT4_SIM_DIRBLOCK_EIO 7
|
| 1994 | #define EXT4_SIM_DIRBLOCK_CRC 8
|
| 1995 |
|
| 1996 | static inline bool ext4_simulate_fail(struct super_block *sb,
|
| 1997 | unsigned long code)
|
| 1998 | {
|
| 1999 | #ifdef CONFIG_EXT4_DEBUG
|
| 2000 | struct ext4_sb_info *sbi = EXT4_SB(sb);
|
| 2001 |
|
| 2002 | if (unlikely(sbi->s_simulate_fail == code)) {
|
| 2003 | sbi->s_simulate_fail = 0;
|
| 2004 | return true;
|
| 2005 | }
|
| 2006 | #endif
|
| 2007 | return false;
|
| 2008 | }
|
| 2009 |
|
| 2010 | |
| 2011 | * Error number codes for s_{first,last}_error_errno
|
| 2012 | *
|
| 2013 | * Linux errno numbers are architecture specific, so we need to translate
|
| 2014 | * them into something which is architecture independent. We don't define
|
| 2015 | * codes for all errno's; just the ones which are most likely to be the cause
|
| 2016 | * of an ext4_error() call.
|
| 2017 |
|
| 2018 | #define EXT4_ERR_UNKNOWN 1
|
| 2019 | #define EXT4_ERR_EIO 2
|
| 2020 | #define EXT4_ERR_ENOMEM 3
|
| 2021 | #define EXT4_ERR_EFSBADCRC 4
|
| 2022 | #define EXT4_ERR_EFSCORRUPTED 5
|
| 2023 | #define EXT4_ERR_ENOSPC 6
|
| 2024 | #define EXT4_ERR_ENOKEY 7
|
| 2025 | #define EXT4_ERR_EROFS 8
|
| 2026 | #define EXT4_ERR_EFBIG 9
|
| 2027 | #define EXT4_ERR_EEXIST 10
|
| 2028 | #define EXT4_ERR_ERANGE 11
|
| 2029 | #define EXT4_ERR_EOVERFLOW 12
|
| 2030 | #define EXT4_ERR_EBUSY 13
|
| 2031 | #define EXT4_ERR_ENOTDIR 14
|
| 2032 | #define EXT4_ERR_ENOTEMPTY 15
|
| 2033 | #define EXT4_ERR_ESHUTDOWN 16
|
| 2034 | #define EXT4_ERR_EFAULT 17
|
| 2035 |
|
| 2036 | |
| 2037 | * Inode dynamic state flags
|
| 2038 |
|
| 2039 | enum {
|
| 2040 | EXT4_STATE_NEW,
|
| 2041 | EXT4_STATE_XATTR,
|
| 2042 | EXT4_STATE_NO_EXPAND,
|
| 2043 | EXT4_STATE_DA_ALLOC_CLOSE,
|
| 2044 | EXT4_STATE_EXT_MIGRATE,
|
| 2045 | EXT4_STATE_NEWENTRY,
|
| 2046 | EXT4_STATE_MAY_INLINE_DATA,
|
| 2047 | EXT4_STATE_EXT_PRECACHED,
|
| 2048 | EXT4_STATE_LUSTRE_EA_INODE,
|
| 2049 | EXT4_STATE_VERITY_IN_PROGRESS,
|
| 2050 | EXT4_STATE_FC_COMMITTING,
|
| 2051 | EXT4_STATE_FC_FLUSHING_DATA,
|
| 2052 | EXT4_STATE_ORPHAN_FILE,
|
| 2053 | EXT4_STATE_FC_REQUEUE,
|
| 2054 | };
|
| 2055 |
|
| 2056 | #define EXT4_INODE_BIT_FNS(name, field, offset) \
|
| 2057 | static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
|
| 2058 | { \
|
| 2059 | return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
|
| 2060 | } \
|
| 2061 | static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
|
| 2062 | { \
|
| 2063 | set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
|
| 2064 | } \
|
| 2065 | static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
|
| 2066 | { \
|
| 2067 | clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
|
| 2068 | }
|
| 2069 |
|
| 2070 | |
| 2071 | * found by name. Otherwise, they are very hard to locate.
|
| 2072 | static inline int ext4_test_inode_flag(struct inode *inode, int bit);
|
| 2073 | static inline void ext4_set_inode_flag(struct inode *inode, int bit);
|
| 2074 | static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
|
| 2075 | EXT4_INODE_BIT_FNS(flag, flags, 0)
|
| 2076 |
|
| 2077 | |
| 2078 | * found by name. Otherwise, they are very hard to locate.
|
| 2079 | static inline int ext4_test_inode_state(struct inode *inode, int bit);
|
| 2080 | static inline void ext4_set_inode_state(struct inode *inode, int bit);
|
| 2081 | static inline void ext4_clear_inode_state(struct inode *inode, int bit);
|
| 2082 | static inline unsigned long *ext4_inode_state_wait_word(struct inode *inode);
|
| 2083 | static inline int ext4_inode_state_wait_bit(int bit);
|
| 2084 | #if (BITS_PER_LONG < 64)
|
| 2085 | EXT4_INODE_BIT_FNS(state, state_flags, 0)
|
| 2086 |
|
| 2087 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
|
| 2088 | {
|
| 2089 | (ei)->i_state_flags = 0;
|
| 2090 | }
|
| 2091 | #else
|
| 2092 | EXT4_INODE_BIT_FNS(state, flags, 32)
|
| 2093 |
|
| 2094 | static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
|
| 2095 | {
|
| 2096 |
|
| 2097 | }
|
| 2098 | #endif
|
| 2099 |
|
| 2100 | static inline unsigned long *ext4_inode_state_wait_word(struct inode *inode)
|
| 2101 | {
|
| 2102 | #if (BITS_PER_LONG < 64)
|
| 2103 | return &EXT4_I(inode)->i_state_flags;
|
| 2104 | #else
|
| 2105 | return &EXT4_I(inode)->i_flags;
|
| 2106 | #endif
|
| 2107 | }
|
| 2108 |
|
| 2109 | static inline int ext4_inode_state_wait_bit(int bit)
|
| 2110 | {
|
| 2111 | #if (BITS_PER_LONG < 64)
|
| 2112 | return bit;
|
| 2113 | #else
|
| 2114 | return bit + 32;
|
| 2115 | #endif
|
| 2116 | }
|
| 2117 | #else
|
| 2118 | |
| 2119 | * a kernel struct super_block. This will allow us to call the feature-test
|
| 2120 | * macros from user land.
|
| 2121 | #define EXT4_SB(sb) (sb)
|
| 2122 | #endif
|
| 2123 |
|
| 2124 | static inline bool ext4_verity_in_progress(struct inode *inode)
|
| 2125 | {
|
| 2126 | return IS_ENABLED(CONFIG_FS_VERITY) &&
|
| 2127 | ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
|
| 2128 | }
|
| 2129 |
|
| 2130 | #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
|
| 2131 |
|
| 2132 | |
| 2133 | * Check whether the inode is tracked as orphan (either in orphan file or
|
| 2134 | * orphan list).
|
| 2135 |
|
| 2136 | static inline bool ext4_inode_orphan_tracked(struct inode *inode)
|
| 2137 | {
|
| 2138 | return ext4_test_inode_state(inode, EXT4_STATE_ORPHAN_FILE) ||
|
| 2139 | !list_empty(&EXT4_I(inode)->i_orphan);
|
| 2140 | }
|
| 2141 |
|
| 2142 | static inline struct mapping_metadata_bhs *ext4_i_metadata_bhs(
|
| 2143 | struct inode *inode)
|
| 2144 | {
|
| 2145 | |
| 2146 | * i_metadata_bhs is set in ext4_inode_attach_mmb() using cmpxchg().
|
| 2147 | * We use READ_ONCE when accessing i_metadata_bhs to make sure we get
|
| 2148 | * consistent view for all accesses.
|
| 2149 |
|
| 2150 | return READ_ONCE(EXT4_I(inode)->i_metadata_bhs);
|
| 2151 | }
|
| 2152 |
|
| 2153 | |
| 2154 | * Codes for operating systems
|
| 2155 |
|
| 2156 | #define EXT4_OS_LINUX 0
|
| 2157 | #define EXT4_OS_HURD 1
|
| 2158 | #define EXT4_OS_MASIX 2
|
| 2159 | #define EXT4_OS_FREEBSD 3
|
| 2160 | #define EXT4_OS_LITES 4
|
| 2161 |
|
| 2162 | |
| 2163 | * Revision levels
|
| 2164 |
|
| 2165 | #define EXT4_GOOD_OLD_REV 0
|
| 2166 | #define EXT4_DYNAMIC_REV 1
|
| 2167 |
|
| 2168 | #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
|
| 2169 |
|
| 2170 | #define EXT4_GOOD_OLD_INODE_SIZE 128
|
| 2171 |
|
| 2172 | #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
|
| 2173 | #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
|
| 2174 | #define EXT4_TIMESTAMP_MIN S32_MIN
|
| 2175 |
|
| 2176 | |
| 2177 | * Feature set definitions
|
| 2178 |
|
| 2179 |
|
| 2180 | #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
|
| 2181 | #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
|
| 2182 | #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
|
| 2183 | #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
|
| 2184 | #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
|
| 2185 | #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
|
| 2186 | #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
|
| 2187 | |
| 2188 | * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
|
| 2189 | * incompatible only if fast commit blocks are present in the FS. Since we
|
| 2190 | * clear the journal (and thus the fast commit blocks), we don't mark FS as
|
| 2191 | * incompatible. We also have a JBD2 incompat feature, which gets set when
|
| 2192 | * there are fast commit blocks present in the journal.
|
| 2193 |
|
| 2194 | #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
|
| 2195 | #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
|
| 2196 | #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000
|
| 2197 |
|
| 2198 | #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
|
| 2199 | #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
|
| 2200 | #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
|
| 2201 | #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
|
| 2202 | #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
|
| 2203 | #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
|
| 2204 | #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
|
| 2205 | #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
|
| 2206 | #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
|
| 2207 | |
| 2208 | * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
|
| 2209 | * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
|
| 2210 | * all other data structures' checksums. However, the METADATA_CSUM and
|
| 2211 | * GDT_CSUM bits are mutually exclusive.
|
| 2212 |
|
| 2213 | #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
|
| 2214 | #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
|
| 2215 | #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
|
| 2216 | #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
|
| 2217 | #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 |
| 2218 | non-empty
|
| 2219 |
|
| 2220 | #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
|
| 2221 | #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
|
| 2222 | #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004
|
| 2223 | #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
|
| 2224 | #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
|
| 2225 | #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
|
| 2226 | #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
|
| 2227 | #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
|
| 2228 | #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
|
| 2229 | #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
|
| 2230 | #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
|
| 2231 | #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
|
| 2232 | #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000
|
| 2233 | #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000
|
| 2234 | #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
|
| 2235 | #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
|
| 2236 |
|
| 2237 | extern void ext4_update_dynamic_rev(struct super_block *sb);
|
| 2238 |
|
| 2239 | #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
|
| 2240 | static inline bool ext4_has_feature_##name(struct super_block *sb) \
|
| 2241 | { \
|
| 2242 | return ((EXT4_SB(sb)->s_es->s_feature_compat & \
|
| 2243 | cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
|
| 2244 | } \
|
| 2245 | static inline void ext4_set_feature_##name(struct super_block *sb) \
|
| 2246 | { \
|
| 2247 | ext4_update_dynamic_rev(sb); \
|
| 2248 | EXT4_SB(sb)->s_es->s_feature_compat |= \
|
| 2249 | cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
|
| 2250 | } \
|
| 2251 | static inline void ext4_clear_feature_##name(struct super_block *sb) \
|
| 2252 | { \
|
| 2253 | EXT4_SB(sb)->s_es->s_feature_compat &= \
|
| 2254 | ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
|
| 2255 | }
|
| 2256 |
|
| 2257 | #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
|
| 2258 | static inline bool ext4_has_feature_##name(struct super_block *sb) \
|
| 2259 | { \
|
| 2260 | return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
|
| 2261 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
|
| 2262 | } \
|
| 2263 | static inline void ext4_set_feature_##name(struct super_block *sb) \
|
| 2264 | { \
|
| 2265 | ext4_update_dynamic_rev(sb); \
|
| 2266 | EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
|
| 2267 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
|
| 2268 | } \
|
| 2269 | static inline void ext4_clear_feature_##name(struct super_block *sb) \
|
| 2270 | { \
|
| 2271 | EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
|
| 2272 | ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
|
| 2273 | }
|
| 2274 |
|
| 2275 | #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
|
| 2276 | static inline bool ext4_has_feature_##name(struct super_block *sb) \
|
| 2277 | { \
|
| 2278 | return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
|
| 2279 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
|
| 2280 | } \
|
| 2281 | static inline void ext4_set_feature_##name(struct super_block *sb) \
|
| 2282 | { \
|
| 2283 | ext4_update_dynamic_rev(sb); \
|
| 2284 | EXT4_SB(sb)->s_es->s_feature_incompat |= \
|
| 2285 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
|
| 2286 | } \
|
| 2287 | static inline void ext4_clear_feature_##name(struct super_block *sb) \
|
| 2288 | { \
|
| 2289 | EXT4_SB(sb)->s_es->s_feature_incompat &= \
|
| 2290 | ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
|
| 2291 | }
|
| 2292 |
|
| 2293 | EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
|
| 2294 | EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
|
| 2295 | EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
|
| 2296 | EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
|
| 2297 | EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
|
| 2298 | EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
|
| 2299 | EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
|
| 2300 | EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
|
| 2301 | EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
|
| 2302 | EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE)
|
| 2303 |
|
| 2304 | EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
|
| 2305 | EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
|
| 2306 | EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
|
| 2307 | EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
|
| 2308 | EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
|
| 2309 | EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
|
| 2310 | EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
|
| 2311 | EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
|
| 2312 | EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
|
| 2313 | EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
|
| 2314 | EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
|
| 2315 | EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
|
| 2316 | EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
|
| 2317 | EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT)
|
| 2318 |
|
| 2319 | EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
|
| 2320 | EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
|
| 2321 | EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
|
| 2322 | EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
|
| 2323 | EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
|
| 2324 | EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
|
| 2325 | EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
|
| 2326 | EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
|
| 2327 | EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
|
| 2328 | EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
|
| 2329 | EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
|
| 2330 | EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
|
| 2331 | EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
|
| 2332 | EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
|
| 2333 | EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
|
| 2334 | EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
|
| 2335 |
|
| 2336 | #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
|
| 2337 | #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
|
| 2338 | EXT4_FEATURE_INCOMPAT_META_BG)
|
| 2339 | #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
|
| 2340 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
|
| 2341 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
|
| 2342 |
|
| 2343 | #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
|
| 2344 | #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
|
| 2345 | EXT4_FEATURE_INCOMPAT_RECOVER| \
|
| 2346 | EXT4_FEATURE_INCOMPAT_META_BG)
|
| 2347 | #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
|
| 2348 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
|
| 2349 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
|
| 2350 |
|
| 2351 | #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \
|
| 2352 | EXT4_FEATURE_COMPAT_ORPHAN_FILE)
|
| 2353 | #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
|
| 2354 | EXT4_FEATURE_INCOMPAT_RECOVER| \
|
| 2355 | EXT4_FEATURE_INCOMPAT_META_BG| \
|
| 2356 | EXT4_FEATURE_INCOMPAT_EXTENTS| \
|
| 2357 | EXT4_FEATURE_INCOMPAT_64BIT| \
|
| 2358 | EXT4_FEATURE_INCOMPAT_FLEX_BG| \
|
| 2359 | EXT4_FEATURE_INCOMPAT_EA_INODE| \
|
| 2360 | EXT4_FEATURE_INCOMPAT_MMP | \
|
| 2361 | EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
|
| 2362 | EXT4_FEATURE_INCOMPAT_ENCRYPT | \
|
| 2363 | EXT4_FEATURE_INCOMPAT_CASEFOLD | \
|
| 2364 | EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
|
| 2365 | EXT4_FEATURE_INCOMPAT_LARGEDIR)
|
| 2366 | #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
|
| 2367 | EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
|
| 2368 | EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
|
| 2369 | EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
|
| 2370 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
|
| 2371 | EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
|
| 2372 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
|
| 2373 | EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
|
| 2374 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
|
| 2375 | EXT4_FEATURE_RO_COMPAT_QUOTA |\
|
| 2376 | EXT4_FEATURE_RO_COMPAT_PROJECT |\
|
| 2377 | EXT4_FEATURE_RO_COMPAT_VERITY |\
|
| 2378 | EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
|
| 2379 |
|
| 2380 | #define EXTN_FEATURE_FUNCS(ver) \
|
| 2381 | static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
|
| 2382 | { \
|
| 2383 | return ((EXT4_SB(sb)->s_es->s_feature_compat & \
|
| 2384 | cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
|
| 2385 | } \
|
| 2386 | static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
|
| 2387 | { \
|
| 2388 | return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
|
| 2389 | cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
|
| 2390 | } \
|
| 2391 | static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
|
| 2392 | { \
|
| 2393 | return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
|
| 2394 | cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
|
| 2395 | }
|
| 2396 |
|
| 2397 | EXTN_FEATURE_FUNCS(2)
|
| 2398 | EXTN_FEATURE_FUNCS(3)
|
| 2399 | EXTN_FEATURE_FUNCS(4)
|
| 2400 |
|
| 2401 | static inline bool ext4_has_compat_features(struct super_block *sb)
|
| 2402 | {
|
| 2403 | return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
|
| 2404 | }
|
| 2405 | static inline bool ext4_has_ro_compat_features(struct super_block *sb)
|
| 2406 | {
|
| 2407 | return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
|
| 2408 | }
|
| 2409 | static inline bool ext4_has_incompat_features(struct super_block *sb)
|
| 2410 | {
|
| 2411 | return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
|
| 2412 | }
|
| 2413 |
|
| 2414 | extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
|
| 2415 |
|
| 2416 | |
| 2417 | * Superblock flags
|
| 2418 |
|
| 2419 | enum {
|
| 2420 | EXT4_FLAGS_RESIZING,
|
| 2421 | EXT4_FLAGS_SHUTDOWN,
|
| 2422 | EXT4_FLAGS_BDEV_IS_DAX,
|
| 2423 | EXT4_FLAGS_EMERGENCY_RO,
|
| 2424 | };
|
| 2425 |
|
| 2426 | static inline int ext4_forced_shutdown(struct super_block *sb)
|
| 2427 | {
|
| 2428 | return test_bit(EXT4_FLAGS_SHUTDOWN, &EXT4_SB(sb)->s_ext4_flags);
|
| 2429 | }
|
| 2430 |
|
| 2431 | static inline int ext4_emergency_ro(struct super_block *sb)
|
| 2432 | {
|
| 2433 | return test_bit(EXT4_FLAGS_EMERGENCY_RO, &EXT4_SB(sb)->s_ext4_flags);
|
| 2434 | }
|
| 2435 |
|
| 2436 | static inline int ext4_emergency_state(struct super_block *sb)
|
| 2437 | {
|
| 2438 | if (unlikely(ext4_forced_shutdown(sb)))
|
| 2439 | return -EIO;
|
| 2440 | if (unlikely(ext4_emergency_ro(sb)))
|
| 2441 | return -EROFS;
|
| 2442 | return 0;
|
| 2443 | }
|
| 2444 |
|
| 2445 | |
| 2446 | * Default values for user and/or group using reserved blocks
|
| 2447 |
|
| 2448 | #define EXT4_DEF_RESUID 0
|
| 2449 | #define EXT4_DEF_RESGID 0
|
| 2450 |
|
| 2451 | |
| 2452 | * Default project ID
|
| 2453 |
|
| 2454 | #define EXT4_DEF_PROJID 0
|
| 2455 |
|
| 2456 | #define EXT4_DEF_INODE_READAHEAD_BLKS 32
|
| 2457 |
|
| 2458 | |
| 2459 | * Default mount options
|
| 2460 |
|
| 2461 | #define EXT4_DEFM_DEBUG 0x0001
|
| 2462 | #define EXT4_DEFM_BSDGROUPS 0x0002
|
| 2463 | #define EXT4_DEFM_XATTR_USER 0x0004
|
| 2464 | #define EXT4_DEFM_ACL 0x0008
|
| 2465 | #define EXT4_DEFM_UID16 0x0010
|
| 2466 | #define EXT4_DEFM_JMODE 0x0060
|
| 2467 | #define EXT4_DEFM_JMODE_DATA 0x0020
|
| 2468 | #define EXT4_DEFM_JMODE_ORDERED 0x0040
|
| 2469 | #define EXT4_DEFM_JMODE_WBACK 0x0060
|
| 2470 | #define EXT4_DEFM_NOBARRIER 0x0100
|
| 2471 | #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
|
| 2472 | #define EXT4_DEFM_DISCARD 0x0400
|
| 2473 | #define EXT4_DEFM_NODELALLOC 0x0800
|
| 2474 |
|
| 2475 | |
| 2476 | * Default journal batch times and ioprio.
|
| 2477 |
|
| 2478 | #define EXT4_DEF_MIN_BATCH_TIME 0
|
| 2479 | #define EXT4_DEF_MAX_BATCH_TIME 15000
|
| 2480 | #define EXT4_DEF_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
|
| 2481 |
|
| 2482 |
|
| 2483 | |
| 2484 | * Default values for superblock update
|
| 2485 |
|
| 2486 | #define EXT4_DEF_SB_UPDATE_INTERVAL_SEC (3600)
|
| 2487 | #define EXT4_DEF_SB_UPDATE_INTERVAL_KB (16384)
|
| 2488 |
|
| 2489 | |
| 2490 | * Minimum number of groups in a flexgroup before we separate out
|
| 2491 | * directories into the first block group of a flexgroup
|
| 2492 |
|
| 2493 | #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
|
| 2494 |
|
| 2495 | |
| 2496 | * Structure of a directory entry
|
| 2497 |
|
| 2498 | #define EXT4_NAME_LEN 255
|
| 2499 | |
| 2500 | * Base length of the ext4 directory entry excluding the name length
|
| 2501 |
|
| 2502 | #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
|
| 2503 |
|
| 2504 | struct ext4_dir_entry {
|
| 2505 | __le32 inode;
|
| 2506 | __le16 rec_len;
|
| 2507 | __le16 name_len;
|
| 2508 | char name[EXT4_NAME_LEN];
|
| 2509 | };
|
| 2510 |
|
| 2511 |
|
| 2512 | |
| 2513 | * Encrypted Casefolded entries require saving the hash on disk. This structure
|
| 2514 | * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
|
| 2515 | * boundary.
|
| 2516 |
|
| 2517 | struct ext4_dir_entry_hash {
|
| 2518 | __le32 hash;
|
| 2519 | __le32 minor_hash;
|
| 2520 | };
|
| 2521 |
|
| 2522 | |
| 2523 | * The new version of the directory entry. Since EXT4 structures are
|
| 2524 | * stored in intel byte order, and the name_len field could never be
|
| 2525 | * bigger than 255 chars, it's safe to reclaim the extra byte for the
|
| 2526 | * file_type field.
|
| 2527 |
|
| 2528 | struct ext4_dir_entry_2 {
|
| 2529 | __le32 inode;
|
| 2530 | __le16 rec_len;
|
| 2531 | __u8 name_len;
|
| 2532 | __u8 file_type;
|
| 2533 | char name[EXT4_NAME_LEN];
|
| 2534 | };
|
| 2535 |
|
| 2536 | |
| 2537 | * Access the hashes at the end of ext4_dir_entry_2
|
| 2538 |
|
| 2539 | #define EXT4_DIRENT_HASHES(entry) \
|
| 2540 | ((struct ext4_dir_entry_hash *) \
|
| 2541 | (((void *)(entry)) + \
|
| 2542 | ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
|
| 2543 | #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(entry)->hash)
|
| 2544 | #define EXT4_DIRENT_MINOR_HASH(entry) \
|
| 2545 | le32_to_cpu(EXT4_DIRENT_HASHES(entry)->minor_hash)
|
| 2546 |
|
| 2547 | static inline bool ext4_hash_in_dirent(const struct inode *inode)
|
| 2548 | {
|
| 2549 | return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
|
| 2550 | }
|
| 2551 |
|
| 2552 | |
| 2553 | * This is a bogus directory entry at the end of each leaf block that
|
| 2554 | * records checksums.
|
| 2555 |
|
| 2556 | struct ext4_dir_entry_tail {
|
| 2557 | __le32 det_reserved_zero1;
|
| 2558 | __le16 det_rec_len;
|
| 2559 | __u8 det_reserved_zero2;
|
| 2560 | __u8 det_reserved_ft;
|
| 2561 | __le32 det_checksum;
|
| 2562 | };
|
| 2563 |
|
| 2564 | #define EXT4_DIRENT_TAIL(block, blocksize) \
|
| 2565 | ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
|
| 2566 | ((blocksize) - \
|
| 2567 | sizeof(struct ext4_dir_entry_tail))))
|
| 2568 |
|
| 2569 | |
| 2570 | * Ext4 directory file types. Only the low 3 bits are used. The
|
| 2571 | * other bits are reserved for now.
|
| 2572 |
|
| 2573 | #define EXT4_FT_UNKNOWN 0
|
| 2574 | #define EXT4_FT_REG_FILE 1
|
| 2575 | #define EXT4_FT_DIR 2
|
| 2576 | #define EXT4_FT_CHRDEV 3
|
| 2577 | #define EXT4_FT_BLKDEV 4
|
| 2578 | #define EXT4_FT_FIFO 5
|
| 2579 | #define EXT4_FT_SOCK 6
|
| 2580 | #define EXT4_FT_SYMLINK 7
|
| 2581 |
|
| 2582 | #define EXT4_FT_MAX 8
|
| 2583 |
|
| 2584 | #define EXT4_FT_DIR_CSUM 0xDE
|
| 2585 |
|
| 2586 | |
| 2587 | * EXT4_DIR_PAD defines the directory entries boundaries
|
| 2588 | *
|
| 2589 | * NOTE: It must be a multiple of 4
|
| 2590 |
|
| 2591 | #define EXT4_DIR_PAD 4
|
| 2592 | #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
|
| 2593 | #define EXT4_MAX_REC_LEN ((1<<16)-1)
|
| 2594 |
|
| 2595 | |
| 2596 | * The rec_len is dependent on the type of directory. Directories that are
|
| 2597 | * casefolded and encrypted need to store the hash as well, so we add room for
|
| 2598 | * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
|
| 2599 | * pass NULL for dir, as those entries do not use the extra fields.
|
| 2600 |
|
| 2601 | static inline unsigned int ext4_dir_rec_len(__u8 name_len,
|
| 2602 | const struct inode *dir)
|
| 2603 | {
|
| 2604 | int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
|
| 2605 |
|
| 2606 | if (dir && ext4_hash_in_dirent(dir))
|
| 2607 | rec_len += sizeof(struct ext4_dir_entry_hash);
|
| 2608 | return (rec_len & ~EXT4_DIR_ROUND);
|
| 2609 | }
|
| 2610 |
|
| 2611 | static inline unsigned int
|
| 2612 | ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
|
| 2613 | {
|
| 2614 | unsigned len = le16_to_cpu(dlen);
|
| 2615 |
|
| 2616 | if (len == EXT4_MAX_REC_LEN || len == 0)
|
| 2617 | return blocksize;
|
| 2618 | return (len & 65532) | ((len & 3) << 16);
|
| 2619 | }
|
| 2620 |
|
| 2621 | static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
|
| 2622 | {
|
| 2623 | BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
|
| 2624 | if (len < 65536)
|
| 2625 | return cpu_to_le16(len);
|
| 2626 | if (len == blocksize) {
|
| 2627 | if (blocksize == 65536)
|
| 2628 | return cpu_to_le16(EXT4_MAX_REC_LEN);
|
| 2629 | else
|
| 2630 | return cpu_to_le16(0);
|
| 2631 | }
|
| 2632 | return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
|
| 2633 | }
|
| 2634 |
|
| 2635 | |
| 2636 | * Hash Tree Directory indexing
|
| 2637 | * (c) Daniel Phillips, 2001
|
| 2638 |
|
| 2639 |
|
| 2640 | #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
|
| 2641 | ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
|
| 2642 | #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
|
| 2643 | !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
|
| 2644 | #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
|
| 2645 |
|
| 2646 |
|
| 2647 |
|
| 2648 | #define DX_HASH_LEGACY 0
|
| 2649 | #define DX_HASH_HALF_MD4 1
|
| 2650 | #define DX_HASH_TEA 2
|
| 2651 | #define DX_HASH_LEGACY_UNSIGNED 3
|
| 2652 | #define DX_HASH_HALF_MD4_UNSIGNED 4
|
| 2653 | #define DX_HASH_TEA_UNSIGNED 5
|
| 2654 | #define DX_HASH_SIPHASH 6
|
| 2655 | #define DX_HASH_LAST DX_HASH_SIPHASH
|
| 2656 |
|
| 2657 | static inline u32 ext4_chksum(u32 crc, const void *address, unsigned int length)
|
| 2658 | {
|
| 2659 | return crc32c(crc, address, length);
|
| 2660 | }
|
| 2661 |
|
| 2662 | #ifdef __KERNEL__
|
| 2663 |
|
| 2664 |
|
| 2665 | struct dx_hash_info
|
| 2666 | {
|
| 2667 | u32 hash;
|
| 2668 | u32 minor_hash;
|
| 2669 | int hash_version;
|
| 2670 | u32 *seed;
|
| 2671 | };
|
| 2672 |
|
| 2673 |
|
| 2674 |
|
| 2675 | #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
|
| 2676 | #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
|
| 2677 |
|
| 2678 |
|
| 2679 | |
| 2680 | * Control parameters used by ext4_htree_next_block
|
| 2681 |
|
| 2682 | #define HASH_NB_ALWAYS 1
|
| 2683 |
|
| 2684 | struct ext4_filename {
|
| 2685 | const struct qstr *usr_fname;
|
| 2686 | struct fscrypt_str disk_name;
|
| 2687 | struct dx_hash_info hinfo;
|
| 2688 | #ifdef CONFIG_FS_ENCRYPTION
|
| 2689 | struct fscrypt_str crypto_buf;
|
| 2690 | #endif
|
| 2691 | #if IS_ENABLED(CONFIG_UNICODE)
|
| 2692 | struct qstr cf_name;
|
| 2693 | #endif
|
| 2694 | };
|
| 2695 |
|
| 2696 | #define fname_name(p) ((p)->disk_name.name)
|
| 2697 | #define fname_usr_name(p) ((p)->usr_fname->name)
|
| 2698 | #define fname_len(p) ((p)->disk_name.len)
|
| 2699 |
|
| 2700 | |
| 2701 | * Describe an inode's exact location on disk and in memory
|
| 2702 |
|
| 2703 | struct ext4_iloc
|
| 2704 | {
|
| 2705 | struct buffer_head *bh;
|
| 2706 | unsigned long offset;
|
| 2707 | ext4_group_t block_group;
|
| 2708 | };
|
| 2709 |
|
| 2710 | static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
|
| 2711 | {
|
| 2712 | return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
|
| 2713 | }
|
| 2714 |
|
| 2715 | static inline bool ext4_is_quota_file(struct inode *inode)
|
| 2716 | {
|
| 2717 | return IS_NOQUOTA(inode) &&
|
| 2718 | !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
|
| 2719 | }
|
| 2720 |
|
| 2721 | |
| 2722 | * This structure is stuffed into the struct file's private_data field
|
| 2723 | * for directories. It is where we put information so that we can do
|
| 2724 | * readdir operations in hash tree order.
|
| 2725 |
|
| 2726 | struct dir_private_info {
|
| 2727 | struct rb_root root;
|
| 2728 | struct rb_node *curr_node;
|
| 2729 | struct fname *extra_fname;
|
| 2730 | loff_t last_pos;
|
| 2731 | __u32 curr_hash;
|
| 2732 | __u32 curr_minor_hash;
|
| 2733 | __u32 next_hash;
|
| 2734 | u64 cookie;
|
| 2735 | bool initialized;
|
| 2736 | };
|
| 2737 |
|
| 2738 |
|
| 2739 | static inline ext4_fsblk_t
|
| 2740 | ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
|
| 2741 | {
|
| 2742 | return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
|
| 2743 | le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
|
| 2744 | }
|
| 2745 |
|
| 2746 | |
| 2747 | * Special error return code only used by dx_probe() and its callers.
|
| 2748 |
|
| 2749 | #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
|
| 2750 |
|
| 2751 |
|
| 2752 | #define EXT4_HTREE_LEVEL_COMPAT 2
|
| 2753 | #define EXT4_HTREE_LEVEL 3
|
| 2754 |
|
| 2755 | static inline int ext4_dir_htree_level(struct super_block *sb)
|
| 2756 | {
|
| 2757 | return ext4_has_feature_largedir(sb) ?
|
| 2758 | EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
|
| 2759 | }
|
| 2760 |
|
| 2761 | |
| 2762 | * Timeout and state flag for lazy initialization inode thread.
|
| 2763 |
|
| 2764 | #define EXT4_DEF_LI_WAIT_MULT 10
|
| 2765 | #define EXT4_DEF_LI_MAX_START_DELAY 5
|
| 2766 | #define EXT4_LAZYINIT_QUIT 0x0001
|
| 2767 | #define EXT4_LAZYINIT_RUNNING 0x0002
|
| 2768 |
|
| 2769 | |
| 2770 | * Lazy inode table initialization info
|
| 2771 |
|
| 2772 | struct ext4_lazy_init {
|
| 2773 | unsigned long li_state;
|
| 2774 | struct list_head li_request_list;
|
| 2775 | struct mutex li_list_mtx;
|
| 2776 | };
|
| 2777 |
|
| 2778 | enum ext4_li_mode {
|
| 2779 | EXT4_LI_MODE_PREFETCH_BBITMAP,
|
| 2780 | EXT4_LI_MODE_ITABLE,
|
| 2781 | };
|
| 2782 |
|
| 2783 | struct ext4_li_request {
|
| 2784 | struct super_block *lr_super;
|
| 2785 | enum ext4_li_mode lr_mode;
|
| 2786 | ext4_group_t lr_first_not_zeroed;
|
| 2787 | ext4_group_t lr_next_group;
|
| 2788 | struct list_head lr_request;
|
| 2789 | unsigned long lr_next_sched;
|
| 2790 | unsigned long lr_timeout;
|
| 2791 | };
|
| 2792 |
|
| 2793 | struct ext4_features {
|
| 2794 | struct kobject f_kobj;
|
| 2795 | struct completion f_kobj_unregister;
|
| 2796 | };
|
| 2797 |
|
| 2798 | |
| 2799 | * This structure will be used for multiple mount protection. It will be
|
| 2800 | * written into the block number saved in the s_mmp_block field in the
|
| 2801 | * superblock. Programs that check MMP should assume that if
|
| 2802 | * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
|
| 2803 | * to use the filesystem, regardless of how old the timestamp is.
|
| 2804 |
|
| 2805 | #define EXT4_MMP_MAGIC 0x004D4D50U
|
| 2806 | #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U
|
| 2807 | #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U
|
| 2808 | #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU
|
| 2809 |
|
| 2810 | struct mmp_struct {
|
| 2811 | __le32 mmp_magic;
|
| 2812 | __le32 mmp_seq;
|
| 2813 |
|
| 2814 | |
| 2815 | * mmp_time, mmp_nodename & mmp_bdevname are only used for information
|
| 2816 | * purposes and do not affect the correctness of the algorithm
|
| 2817 |
|
| 2818 | __le64 mmp_time;
|
| 2819 | char mmp_nodename[64];
|
| 2820 | char mmp_bdevname[32];
|
| 2821 |
|
| 2822 | |
| 2823 | * mmp_check_interval is used to verify if the MMP block has been
|
| 2824 | * updated on the block device. The value is updated based on the
|
| 2825 | * maximum time to write the MMP block during an update cycle.
|
| 2826 |
|
| 2827 | __le16 mmp_check_interval;
|
| 2828 |
|
| 2829 | __le16 mmp_pad1;
|
| 2830 | __le32 mmp_pad2[226];
|
| 2831 | __le32 mmp_checksum;
|
| 2832 | };
|
| 2833 |
|
| 2834 |
|
| 2835 | struct mmpd_data {
|
| 2836 | struct buffer_head *bh;
|
| 2837 | struct super_block *sb;
|
| 2838 | };
|
| 2839 |
|
| 2840 | |
| 2841 | * Check interval multiplier
|
| 2842 | * The MMP block is written every update interval and initially checked every
|
| 2843 | * update interval x the multiplier (the value is then adapted based on the
|
| 2844 | * write latency). The reason is that writes can be delayed under load and we
|
| 2845 | * don't want readers to incorrectly assume that the filesystem is no longer
|
| 2846 | * in use.
|
| 2847 |
|
| 2848 | #define EXT4_MMP_CHECK_MULT 2UL
|
| 2849 |
|
| 2850 | |
| 2851 | * Minimum interval for MMP checking in seconds.
|
| 2852 |
|
| 2853 | #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
|
| 2854 |
|
| 2855 | |
| 2856 | * Maximum interval for MMP checking in seconds.
|
| 2857 |
|
| 2858 | #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
|
| 2859 |
|
| 2860 | |
| 2861 | * Function prototypes
|
| 2862 |
|
| 2863 |
|
| 2864 | |
| 2865 | * Ok, these declarations are also in <linux/kernel.h> but none of the
|
| 2866 | * ext4 source programs needs to include it so they are duplicated here.
|
| 2867 |
|
| 2868 | # define NORET_TYPE
|
| 2869 | # define ATTRIB_NORET __attribute__((noreturn))
|
| 2870 | # define NORET_AND noreturn,
|
| 2871 |
|
| 2872 |
|
| 2873 | extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
|
| 2874 | void ext4_inode_bitmap_csum_set(struct super_block *sb,
|
| 2875 | struct ext4_group_desc *gdp,
|
| 2876 | struct buffer_head *bh);
|
| 2877 | int ext4_inode_bitmap_csum_verify(struct super_block *sb,
|
| 2878 | struct ext4_group_desc *gdp,
|
| 2879 | struct buffer_head *bh);
|
| 2880 | void ext4_block_bitmap_csum_set(struct super_block *sb,
|
| 2881 | struct ext4_group_desc *gdp,
|
| 2882 | struct buffer_head *bh);
|
| 2883 | int ext4_block_bitmap_csum_verify(struct super_block *sb,
|
| 2884 | struct ext4_group_desc *gdp,
|
| 2885 | struct buffer_head *bh);
|
| 2886 |
|
| 2887 |
|
| 2888 | extern void ext4_get_group_no_and_offset(struct super_block *sb,
|
| 2889 | ext4_fsblk_t blocknr,
|
| 2890 | ext4_group_t *blockgrpp,
|
| 2891 | ext4_grpblk_t *offsetp);
|
| 2892 | extern ext4_group_t ext4_get_group_number(struct super_block *sb,
|
| 2893 | ext4_fsblk_t block);
|
| 2894 |
|
| 2895 | extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
|
| 2896 | extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
|
| 2897 | ext4_group_t group);
|
| 2898 | extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
|
| 2899 | ext4_fsblk_t goal,
|
| 2900 | unsigned int flags,
|
| 2901 | unsigned long *count,
|
| 2902 | int *errp);
|
| 2903 | extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
|
| 2904 | s64 nclusters, unsigned int flags);
|
| 2905 | extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
|
| 2906 | extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
|
| 2907 | ext4_group_t block_group,
|
| 2908 | struct buffer_head ** bh);
|
| 2909 | extern struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
|
| 2910 | ext4_group_t group);
|
| 2911 | extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
|
| 2912 |
|
| 2913 | extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
|
| 2914 | ext4_group_t block_group,
|
| 2915 | bool ignore_locked);
|
| 2916 | extern int ext4_wait_block_bitmap(struct super_block *sb,
|
| 2917 | ext4_group_t block_group,
|
| 2918 | struct buffer_head *bh);
|
| 2919 | extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
|
| 2920 | ext4_group_t block_group);
|
| 2921 | extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
|
| 2922 | ext4_group_t block_group,
|
| 2923 | struct ext4_group_desc *gdp);
|
| 2924 | ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
|
| 2925 |
|
| 2926 | #if IS_ENABLED(CONFIG_UNICODE)
|
| 2927 | extern int ext4_fname_setup_ci_filename(struct inode *dir,
|
| 2928 | const struct qstr *iname,
|
| 2929 | struct ext4_filename *fname);
|
| 2930 |
|
| 2931 | static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)
|
| 2932 | {
|
| 2933 | kfree(fname->cf_name.name);
|
| 2934 | fname->cf_name.name = NULL;
|
| 2935 | }
|
| 2936 | #else
|
| 2937 | static inline int ext4_fname_setup_ci_filename(struct inode *dir,
|
| 2938 | const struct qstr *iname,
|
| 2939 | struct ext4_filename *fname)
|
| 2940 | {
|
| 2941 | return 0;
|
| 2942 | }
|
| 2943 |
|
| 2944 | static inline void ext4_fname_free_ci_filename(struct ext4_filename *fname)
|
| 2945 | {
|
| 2946 | }
|
| 2947 | #endif
|
| 2948 |
|
| 2949 |
|
| 2950 | #ifdef CONFIG_FS_ENCRYPTION
|
| 2951 | extern const struct fscrypt_operations ext4_cryptops;
|
| 2952 |
|
| 2953 | int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
|
| 2954 | int lookup, struct ext4_filename *fname);
|
| 2955 |
|
| 2956 | int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
|
| 2957 | struct ext4_filename *fname);
|
| 2958 |
|
| 2959 | void ext4_fname_free_filename(struct ext4_filename *fname);
|
| 2960 |
|
| 2961 | int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
|
| 2962 |
|
| 2963 | #else
|
| 2964 | static inline int ext4_fname_setup_filename(struct inode *dir,
|
| 2965 | const struct qstr *iname,
|
| 2966 | int lookup,
|
| 2967 | struct ext4_filename *fname)
|
| 2968 | {
|
| 2969 | fname->usr_fname = iname;
|
| 2970 | fname->disk_name.name = (unsigned char *) iname->name;
|
| 2971 | fname->disk_name.len = iname->len;
|
| 2972 |
|
| 2973 | return ext4_fname_setup_ci_filename(dir, iname, fname);
|
| 2974 | }
|
| 2975 |
|
| 2976 | static inline int ext4_fname_prepare_lookup(struct inode *dir,
|
| 2977 | struct dentry *dentry,
|
| 2978 | struct ext4_filename *fname)
|
| 2979 | {
|
| 2980 | return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
|
| 2981 | }
|
| 2982 |
|
| 2983 | static inline void ext4_fname_free_filename(struct ext4_filename *fname)
|
| 2984 | {
|
| 2985 | ext4_fname_free_ci_filename(fname);
|
| 2986 | }
|
| 2987 |
|
| 2988 | static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
|
| 2989 | void __user *arg)
|
| 2990 | {
|
| 2991 | return -EOPNOTSUPP;
|
| 2992 | }
|
| 2993 | #endif
|
| 2994 |
|
| 2995 |
|
| 2996 | extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
|
| 2997 | struct file *,
|
| 2998 | struct ext4_dir_entry_2 *,
|
| 2999 | struct buffer_head *, char *, int,
|
| 3000 | unsigned int);
|
| 3001 | #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
|
| 3002 | unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
|
| 3003 | (de), (bh), (buf), (size), (offset)))
|
| 3004 | extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
|
| 3005 | __u32 minor_hash,
|
| 3006 | struct ext4_dir_entry_2 *dirent,
|
| 3007 | struct fscrypt_str *ent_name);
|
| 3008 | extern void ext4_htree_free_dir_info(struct dir_private_info *p);
|
| 3009 | extern int ext4_find_dest_de(struct inode *dir, struct buffer_head *bh,
|
| 3010 | void *buf, int buf_size,
|
| 3011 | struct ext4_filename *fname,
|
| 3012 | struct ext4_dir_entry_2 **dest_de);
|
| 3013 | void ext4_insert_dentry(struct inode *dir, struct inode *inode,
|
| 3014 | struct ext4_dir_entry_2 *de,
|
| 3015 | int buf_size,
|
| 3016 | struct ext4_filename *fname);
|
| 3017 | static inline void ext4_update_dx_flag(struct inode *inode)
|
| 3018 | {
|
| 3019 | if (!ext4_has_feature_dir_index(inode->i_sb) &&
|
| 3020 | ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
|
| 3021 |
|
| 3022 | WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
|
| 3023 | ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
|
| 3024 | }
|
| 3025 | }
|
| 3026 | static const unsigned char ext4_filetype_table[] = {
|
| 3027 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
|
| 3028 | };
|
| 3029 |
|
| 3030 | static inline unsigned char get_dtype(struct super_block *sb, int filetype)
|
| 3031 | {
|
| 3032 | if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
|
| 3033 | return DT_UNKNOWN;
|
| 3034 |
|
| 3035 | return ext4_filetype_table[filetype];
|
| 3036 | }
|
| 3037 | extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
|
| 3038 | void *buf, int buf_size);
|
| 3039 |
|
| 3040 |
|
| 3041 | extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
|
| 3042 |
|
| 3043 |
|
| 3044 | extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
|
| 3045 | struct dx_hash_info *hinfo);
|
| 3046 |
|
| 3047 |
|
| 3048 | extern int ext4_mark_inode_used(struct super_block *sb, int ino);
|
| 3049 | extern struct inode *__ext4_new_inode(const struct mnt_idmap *, handle_t *,
|
| 3050 | struct inode *, umode_t,
|
| 3051 | const struct qstr *qstr, __u32 goal,
|
| 3052 | uid_t *owner, __u32 i_flags,
|
| 3053 | int handle_type, unsigned int line_no,
|
| 3054 | int nblocks);
|
| 3055 |
|
| 3056 | #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
|
| 3057 | __ext4_new_inode(&nop_mnt_idmap, (handle), (dir), (mode), (qstr), \
|
| 3058 | (goal), (owner), i_flags, 0, 0, 0)
|
| 3059 | #define ext4_new_inode_start_handle(idmap, dir, mode, qstr, goal, owner, \
|
| 3060 | type, nblocks) \
|
| 3061 | __ext4_new_inode((idmap), NULL, (dir), (mode), (qstr), (goal), (owner), \
|
| 3062 | 0, (type), __LINE__, (nblocks))
|
| 3063 |
|
| 3064 |
|
| 3065 | extern void ext4_free_inode(handle_t *, struct inode *);
|
| 3066 | extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
|
| 3067 | extern unsigned long ext4_count_free_inodes(struct super_block *);
|
| 3068 | extern unsigned long ext4_count_dirs(struct super_block *);
|
| 3069 | extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
|
| 3070 | extern int ext4_init_inode_table(struct super_block *sb,
|
| 3071 | ext4_group_t group, int barrier);
|
| 3072 | void ext4_end_bitmap_read(struct bio *bio);
|
| 3073 |
|
| 3074 |
|
| 3075 | int ext4_fc_info_show(struct seq_file *seq, void *v);
|
| 3076 | void ext4_fc_init(struct super_block *sb, journal_t *journal);
|
| 3077 | void ext4_fc_init_inode(struct inode *inode);
|
| 3078 | void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
|
| 3079 | ext4_lblk_t end);
|
| 3080 | void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
|
| 3081 | struct dentry *dentry);
|
| 3082 | void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
|
| 3083 | struct dentry *dentry);
|
| 3084 | void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
|
| 3085 | void ext4_fc_track_link(handle_t *handle, struct inode *inode,
|
| 3086 | struct dentry *dentry);
|
| 3087 | void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
|
| 3088 | struct dentry *dentry);
|
| 3089 | void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
|
| 3090 | void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
|
| 3091 | void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
|
| 3092 | void ext4_fc_del(struct inode *inode);
|
| 3093 | bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
|
| 3094 | void ext4_fc_replay_cleanup(struct super_block *sb);
|
| 3095 | int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
|
| 3096 | int __init ext4_fc_init_dentry_cache(void);
|
| 3097 | void ext4_fc_destroy_dentry_cache(void);
|
| 3098 | int ext4_fc_record_regions(struct super_block *sb, int ino,
|
| 3099 | ext4_lblk_t lblk, ext4_fsblk_t pblk,
|
| 3100 | int len, int replay);
|
| 3101 |
|
| 3102 |
|
| 3103 | extern const struct seq_operations ext4_mb_seq_groups_ops;
|
| 3104 | extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
|
| 3105 | extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
|
| 3106 | extern int ext4_mb_init(struct super_block *);
|
| 3107 | extern void ext4_mb_release(struct super_block *);
|
| 3108 | extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
|
| 3109 | struct ext4_allocation_request *, int *);
|
| 3110 | extern void ext4_discard_preallocations(struct inode *);
|
| 3111 | extern int __init ext4_init_mballoc(void);
|
| 3112 | extern void ext4_exit_mballoc(void);
|
| 3113 | extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
|
| 3114 | ext4_group_t group,
|
| 3115 | unsigned int nr, int *cnt);
|
| 3116 | extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
|
| 3117 | unsigned int nr);
|
| 3118 |
|
| 3119 | extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
|
| 3120 | struct buffer_head *bh, ext4_fsblk_t block,
|
| 3121 | unsigned long count, int flags);
|
| 3122 | extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
|
| 3123 | ext4_group_t ngroups);
|
| 3124 | extern int ext4_mb_add_groupinfo(struct super_block *sb,
|
| 3125 | ext4_group_t i, struct ext4_group_desc *desc);
|
| 3126 | extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
|
| 3127 | ext4_fsblk_t block, unsigned long count);
|
| 3128 | extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
|
| 3129 | extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
|
| 3130 | extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
|
| 3131 | int len, bool state);
|
| 3132 | static inline bool ext4_mb_cr_expensive(enum criteria cr)
|
| 3133 | {
|
| 3134 | return cr >= CR_GOAL_LEN_SLOW;
|
| 3135 | }
|
| 3136 |
|
| 3137 |
|
| 3138 | void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
|
| 3139 | struct ext4_inode_info *ei);
|
| 3140 | int ext4_inode_is_fast_symlink(struct inode *inode);
|
| 3141 | void ext4_check_map_extents_env(struct inode *inode);
|
| 3142 | struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
|
| 3143 | struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
|
| 3144 | int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
|
| 3145 | bool wait, struct buffer_head **bhs);
|
| 3146 | int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
|
| 3147 | struct buffer_head *bh_result, int create);
|
| 3148 | int ext4_get_block(struct inode *inode, sector_t iblock,
|
| 3149 | struct buffer_head *bh_result, int create);
|
| 3150 | int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
|
| 3151 | struct buffer_head *bh, int create);
|
| 3152 | int ext4_walk_page_buffers(handle_t *handle,
|
| 3153 | struct inode *inode,
|
| 3154 | struct buffer_head *head,
|
| 3155 | unsigned from,
|
| 3156 | unsigned to,
|
| 3157 | int *partial,
|
| 3158 | int (*fn)(handle_t *handle, struct inode *inode,
|
| 3159 | struct buffer_head *bh));
|
| 3160 | int do_journal_get_write_access(handle_t *handle, struct inode *inode,
|
| 3161 | struct buffer_head *bh);
|
| 3162 | void ext4_set_inode_mapping_order(struct inode *inode);
|
| 3163 | #define FALL_BACK_TO_NONDELALLOC 1
|
| 3164 | #define EXT4_WRITE_DATA_INLINE 2
|
| 3165 |
|
| 3166 | typedef enum {
|
| 3167 | EXT4_IGET_NORMAL = 0,
|
| 3168 | EXT4_IGET_SPECIAL = 0x0001,
|
| 3169 | EXT4_IGET_HANDLE = 0x0002,
|
| 3170 | EXT4_IGET_BAD = 0x0004,
|
| 3171 | EXT4_IGET_EA_INODE = 0x0008,
|
| 3172 | EXT4_IGET_NOWAIT = 0x0010
|
| 3173 | } ext4_iget_flags;
|
| 3174 |
|
| 3175 | extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
|
| 3176 | ext4_iget_flags flags, const char *function,
|
| 3177 | unsigned int line);
|
| 3178 |
|
| 3179 | #define ext4_iget(sb, ino, flags) \
|
| 3180 | __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
|
| 3181 |
|
| 3182 | extern int ext4_write_inode(struct inode *, struct writeback_control *);
|
| 3183 | extern int ext4_sync_inode_metadata(struct inode *, struct writeback_control *);
|
| 3184 | extern int ext4_setattr(const struct mnt_idmap *, struct dentry *,
|
| 3185 | struct iattr *);
|
| 3186 | extern u32 ext4_dio_alignment(struct inode *inode);
|
| 3187 | extern int ext4_getattr(const struct mnt_idmap *, const struct path *,
|
| 3188 | struct kstat *, u32, unsigned int);
|
| 3189 | extern void ext4_evict_inode(struct inode *);
|
| 3190 | extern void ext4_clear_inode(struct inode *);
|
| 3191 | extern int ext4_file_getattr(const struct mnt_idmap *, const struct path *,
|
| 3192 | struct kstat *, u32, unsigned int);
|
| 3193 | extern void ext4_dirty_inode(struct inode *, int);
|
| 3194 | extern int ext4_change_inode_journal_flag(struct inode *, int);
|
| 3195 | int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc);
|
| 3196 | int ext4_get_inode_loc_noio(struct inode *inode, struct ext4_iloc *iloc);
|
| 3197 | int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
|
| 3198 | struct ext4_iloc *iloc);
|
| 3199 | extern int ext4_inode_attach_jinode(struct inode *inode);
|
| 3200 | extern int ext4_can_truncate(struct inode *inode);
|
| 3201 | extern int ext4_truncate(struct inode *);
|
| 3202 | extern int ext4_break_layouts(struct inode *);
|
| 3203 | extern int ext4_truncate_page_cache_block_range(struct inode *inode,
|
| 3204 | loff_t start, loff_t end);
|
| 3205 | extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
|
| 3206 | extern void ext4_set_inode_flags(struct inode *, bool init);
|
| 3207 | extern int ext4_alloc_da_blocks(struct inode *inode);
|
| 3208 | extern void ext4_set_aops(struct inode *inode);
|
| 3209 | extern int ext4_normal_submit_inode_data_buffers(struct jbd2_inode *jinode);
|
| 3210 | extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
|
| 3211 | extern int ext4_chunk_trans_extent(struct inode *inode, int nrblocks);
|
| 3212 | extern int ext4_meta_trans_blocks(struct inode *inode, int lblocks,
|
| 3213 | int pextents, int alloc_extents);
|
| 3214 | extern int ext4_block_zero_eof(struct inode *inode, loff_t from, loff_t end);
|
| 3215 |
|
| 3216 | #define EXT4_PARTIAL_ZERO_START 0x1
|
| 3217 | #define EXT4_PARTIAL_ZERO_END 0x2
|
| 3218 | extern int ext4_zero_partial_blocks(struct inode *inode, loff_t lstart,
|
| 3219 | loff_t length, unsigned int *partial_zeroed);
|
| 3220 | extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
|
| 3221 | extern qsize_t *ext4_get_reserved_space(struct inode *inode);
|
| 3222 | extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
|
| 3223 | extern void ext4_da_release_space(struct inode *inode, int to_free);
|
| 3224 | extern void ext4_da_update_reserve_space(struct inode *inode,
|
| 3225 | int used, int quota_claim);
|
| 3226 | extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
|
| 3227 | ext4_fsblk_t pblk, ext4_lblk_t len);
|
| 3228 |
|
| 3229 | static inline bool is_special_ino(struct super_block *sb, unsigned long ino)
|
| 3230 | {
|
| 3231 | struct ext4_super_block *es = EXT4_SB(sb)->s_es;
|
| 3232 |
|
| 3233 | return (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) ||
|
| 3234 | ino == le32_to_cpu(es->s_usr_quota_inum) ||
|
| 3235 | ino == le32_to_cpu(es->s_grp_quota_inum) ||
|
| 3236 | ino == le32_to_cpu(es->s_prj_quota_inum) ||
|
| 3237 | ino == le32_to_cpu(es->s_orphan_file_inum);
|
| 3238 | }
|
| 3239 |
|
| 3240 |
|
| 3241 | extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
|
| 3242 | struct ext4_map_blocks *map, int flags);
|
| 3243 | extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
|
| 3244 | extern void ext4_ind_truncate(handle_t *, struct inode *inode);
|
| 3245 | extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
|
| 3246 | ext4_lblk_t start, ext4_lblk_t end);
|
| 3247 |
|
| 3248 |
|
| 3249 | extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
|
| 3250 | extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
|
| 3251 | int ext4_fileattr_set(const struct mnt_idmap *idmap,
|
| 3252 | struct dentry *dentry, struct file_kattr *fa);
|
| 3253 | int ext4_fileattr_get(struct dentry *dentry, struct file_kattr *fa);
|
| 3254 | extern void ext4_reset_inode_seed(struct inode *inode);
|
| 3255 | int ext4_update_overhead(struct super_block *sb, bool force);
|
| 3256 | int ext4_force_shutdown(struct super_block *sb, u32 flags);
|
| 3257 |
|
| 3258 |
|
| 3259 | extern int ext4_ext_migrate(struct inode *);
|
| 3260 | extern int ext4_ind_migrate(struct inode *inode);
|
| 3261 |
|
| 3262 |
|
| 3263 | extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
|
| 3264 | struct inode *inode);
|
| 3265 | extern int ext4_dirblock_csum_verify(struct inode *inode,
|
| 3266 | struct buffer_head *bh);
|
| 3267 | extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
|
| 3268 | __u32 start_minor_hash, __u32 *next_hash);
|
| 3269 | extern int ext4_search_dir(struct buffer_head *bh,
|
| 3270 | char *search_buf,
|
| 3271 | int buf_size,
|
| 3272 | struct inode *dir,
|
| 3273 | struct ext4_filename *fname,
|
| 3274 | unsigned int offset,
|
| 3275 | struct ext4_dir_entry_2 **res_dir);
|
| 3276 | extern int ext4_generic_delete_entry(struct inode *dir,
|
| 3277 | struct ext4_dir_entry_2 *de_del,
|
| 3278 | struct buffer_head *bh,
|
| 3279 | void *entry_buf,
|
| 3280 | int buf_size,
|
| 3281 | int csum_size);
|
| 3282 | extern bool ext4_empty_dir(struct inode *inode);
|
| 3283 |
|
| 3284 |
|
| 3285 | extern void ext4_kvfree_array_rcu(void *to_free);
|
| 3286 | extern int ext4_group_add(struct super_block *sb,
|
| 3287 | struct ext4_new_group_data *input);
|
| 3288 | extern int ext4_group_extend(struct super_block *sb,
|
| 3289 | struct ext4_super_block *es,
|
| 3290 | ext4_fsblk_t n_blocks_count);
|
| 3291 | extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
|
| 3292 | extern unsigned int ext4_list_backups(struct super_block *sb,
|
| 3293 | unsigned int *three, unsigned int *five,
|
| 3294 | unsigned int *seven);
|
| 3295 |
|
| 3296 |
|
| 3297 | extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
|
| 3298 | sector_t block, blk_opf_t op_flags);
|
| 3299 | extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
|
| 3300 | sector_t block);
|
| 3301 | extern struct buffer_head *ext4_sb_bread_nofail(struct super_block *sb,
|
| 3302 | sector_t block);
|
| 3303 | void ext4_read_bh_nowait(struct buffer_head *bh, blk_opf_t op_flags,
|
| 3304 | bio_end_io_t end_io, bool simu_fail);
|
| 3305 | int ext4_read_bh(struct buffer_head *bh, blk_opf_t op_flags,
|
| 3306 | bio_end_io_t end_io, bool simu_fail);
|
| 3307 | extern int ext4_read_bh_lock(struct buffer_head *bh, blk_opf_t op_flags, bool wait);
|
| 3308 | extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
|
| 3309 | extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
|
| 3310 | extern int ext4_calculate_overhead(struct super_block *sb);
|
| 3311 | extern __le32 ext4_superblock_csum(struct ext4_super_block *es);
|
| 3312 | extern void ext4_superblock_csum_set(struct super_block *sb);
|
| 3313 | extern int ext4_alloc_flex_bg_array(struct super_block *sb,
|
| 3314 | ext4_group_t ngroup);
|
| 3315 | extern const char *ext4_decode_error(struct super_block *sb, int errno,
|
| 3316 | char nbuf[16]);
|
| 3317 | extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
|
| 3318 | ext4_group_t block_group,
|
| 3319 | unsigned int flags);
|
| 3320 | extern unsigned int ext4_num_base_meta_blocks(struct super_block *sb,
|
| 3321 | ext4_group_t block_group);
|
| 3322 | extern void print_daily_error_info(struct timer_list *t);
|
| 3323 |
|
| 3324 | extern __printf(7, 8)
|
| 3325 | void __ext4_error(struct super_block *, const char *, unsigned int, bool,
|
| 3326 | int, __u64, const char *, ...);
|
| 3327 | extern __printf(6, 7)
|
| 3328 | void __ext4_error_inode(struct inode *, const char *, unsigned int,
|
| 3329 | ext4_fsblk_t, int, const char *, ...);
|
| 3330 | extern __printf(5, 6)
|
| 3331 | void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
|
| 3332 | const char *, ...);
|
| 3333 | extern void __ext4_std_error(struct super_block *, const char *,
|
| 3334 | unsigned int, int);
|
| 3335 | extern __printf(4, 5)
|
| 3336 | void __ext4_warning(struct super_block *, const char *, unsigned int,
|
| 3337 | const char *, ...);
|
| 3338 | extern __printf(4, 5)
|
| 3339 | void __ext4_warning_inode(const struct inode *inode, const char *function,
|
| 3340 | unsigned int line, const char *fmt, ...);
|
| 3341 | extern __printf(3, 4)
|
| 3342 | void __ext4_msg(struct super_block *, const char *, const char *, ...);
|
| 3343 | extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
|
| 3344 | const char *, unsigned int, const char *);
|
| 3345 | extern __printf(7, 8)
|
| 3346 | void __ext4_grp_locked_error(const char *, unsigned int,
|
| 3347 | struct super_block *, ext4_group_t,
|
| 3348 | u64, ext4_fsblk_t,
|
| 3349 | const char *, ...);
|
| 3350 |
|
| 3351 | #define EXT4_ERROR_INODE(inode, fmt, a...) \
|
| 3352 | ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
|
| 3353 |
|
| 3354 | #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
|
| 3355 | __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
|
| 3356 |
|
| 3357 | #define ext4_error_inode_block(inode, block, err, fmt, a...) \
|
| 3358 | __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
|
| 3359 | (fmt), ## a)
|
| 3360 |
|
| 3361 | #define EXT4_ERROR_FILE(file, block, fmt, a...) \
|
| 3362 | ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
|
| 3363 |
|
| 3364 | #define ext4_abort(sb, err, fmt, a...) \
|
| 3365 | __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
|
| 3366 |
|
| 3367 | #ifdef CONFIG_PRINTK
|
| 3368 |
|
| 3369 | #define ext4_error_inode(inode, func, line, block, fmt, ...) \
|
| 3370 | __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
|
| 3371 | #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
|
| 3372 | __ext4_error_inode((inode), (func), (line), (block), \
|
| 3373 | (err), (fmt), ##__VA_ARGS__)
|
| 3374 | #define ext4_error_file(file, func, line, block, fmt, ...) \
|
| 3375 | __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
|
| 3376 | #define ext4_error(sb, fmt, ...) \
|
| 3377 | __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
|
| 3378 | ##__VA_ARGS__)
|
| 3379 | #define ext4_error_err(sb, err, fmt, ...) \
|
| 3380 | __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
|
| 3381 | ##__VA_ARGS__)
|
| 3382 | #define ext4_warning(sb, fmt, ...) \
|
| 3383 | __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
|
| 3384 | #define ext4_warning_inode(inode, fmt, ...) \
|
| 3385 | __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
|
| 3386 | #define ext4_msg(sb, level, fmt, ...) \
|
| 3387 | __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
|
| 3388 | #define dump_mmp_msg(sb, mmp, msg) \
|
| 3389 | __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
|
| 3390 | #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
|
| 3391 | __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
|
| 3392 | fmt, ##__VA_ARGS__)
|
| 3393 |
|
| 3394 | #else
|
| 3395 |
|
| 3396 | #define ext4_error_inode(inode, func, line, block, fmt, ...) \
|
| 3397 | do { \
|
| 3398 | no_printk(fmt, ##__VA_ARGS__); \
|
| 3399 | __ext4_error_inode(inode, "", 0, block, 0, " "); \
|
| 3400 | } while (0)
|
| 3401 | #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
|
| 3402 | do { \
|
| 3403 | no_printk(fmt, ##__VA_ARGS__); \
|
| 3404 | __ext4_error_inode(inode, "", 0, block, err, " "); \
|
| 3405 | } while (0)
|
| 3406 | #define ext4_error_file(file, func, line, block, fmt, ...) \
|
| 3407 | do { \
|
| 3408 | no_printk(fmt, ##__VA_ARGS__); \
|
| 3409 | __ext4_error_file(file, "", 0, block, " "); \
|
| 3410 | } while (0)
|
| 3411 | #define ext4_error(sb, fmt, ...) \
|
| 3412 | do { \
|
| 3413 | no_printk(fmt, ##__VA_ARGS__); \
|
| 3414 | __ext4_error(sb, "", 0, false, 0, 0, " "); \
|
| 3415 | } while (0)
|
| 3416 | #define ext4_error_err(sb, err, fmt, ...) \
|
| 3417 | do { \
|
| 3418 | no_printk(fmt, ##__VA_ARGS__); \
|
| 3419 | __ext4_error(sb, "", 0, false, err, 0, " "); \
|
| 3420 | } while (0)
|
| 3421 | #define ext4_warning(sb, fmt, ...) \
|
| 3422 | do { \
|
| 3423 | no_printk(fmt, ##__VA_ARGS__); \
|
| 3424 | __ext4_warning(sb, "", 0, " "); \
|
| 3425 | } while (0)
|
| 3426 | #define ext4_warning_inode(inode, fmt, ...) \
|
| 3427 | do { \
|
| 3428 | no_printk(fmt, ##__VA_ARGS__); \
|
| 3429 | __ext4_warning_inode(inode, "", 0, " "); \
|
| 3430 | } while (0)
|
| 3431 | #define ext4_msg(sb, level, fmt, ...) \
|
| 3432 | do { \
|
| 3433 | no_printk(fmt, ##__VA_ARGS__); \
|
| 3434 | __ext4_msg(sb, "", " "); \
|
| 3435 | } while (0)
|
| 3436 | #define dump_mmp_msg(sb, mmp, msg) \
|
| 3437 | __dump_mmp_msg(sb, mmp, "", 0, "")
|
| 3438 | #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
|
| 3439 | do { \
|
| 3440 | no_printk(fmt, ##__VA_ARGS__); \
|
| 3441 | __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
|
| 3442 | } while (0)
|
| 3443 |
|
| 3444 | #endif
|
| 3445 |
|
| 3446 | extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
|
| 3447 | struct ext4_group_desc *bg);
|
| 3448 | extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
|
| 3449 | struct ext4_group_desc *bg);
|
| 3450 | extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
|
| 3451 | struct ext4_group_desc *bg);
|
| 3452 | extern __u32 ext4_free_group_clusters(struct super_block *sb,
|
| 3453 | struct ext4_group_desc *bg);
|
| 3454 | extern __u32 ext4_free_inodes_count(struct super_block *sb,
|
| 3455 | struct ext4_group_desc *bg);
|
| 3456 | extern __u32 ext4_used_dirs_count(struct super_block *sb,
|
| 3457 | struct ext4_group_desc *bg);
|
| 3458 | extern __u32 ext4_itable_unused_count(struct super_block *sb,
|
| 3459 | struct ext4_group_desc *bg);
|
| 3460 | extern void ext4_block_bitmap_set(struct super_block *sb,
|
| 3461 | struct ext4_group_desc *bg, ext4_fsblk_t blk);
|
| 3462 | extern void ext4_inode_bitmap_set(struct super_block *sb,
|
| 3463 | struct ext4_group_desc *bg, ext4_fsblk_t blk);
|
| 3464 | extern void ext4_inode_table_set(struct super_block *sb,
|
| 3465 | struct ext4_group_desc *bg, ext4_fsblk_t blk);
|
| 3466 | extern void ext4_free_group_clusters_set(struct super_block *sb,
|
| 3467 | struct ext4_group_desc *bg,
|
| 3468 | __u32 count);
|
| 3469 | extern void ext4_free_inodes_set(struct super_block *sb,
|
| 3470 | struct ext4_group_desc *bg, __u32 count);
|
| 3471 | extern void ext4_used_dirs_set(struct super_block *sb,
|
| 3472 | struct ext4_group_desc *bg, __u32 count);
|
| 3473 | extern void ext4_itable_unused_set(struct super_block *sb,
|
| 3474 | struct ext4_group_desc *bg, __u32 count);
|
| 3475 | extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
|
| 3476 | struct ext4_group_desc *gdp);
|
| 3477 | extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
|
| 3478 | struct ext4_group_desc *gdp);
|
| 3479 | extern int ext4_register_li_request(struct super_block *sb,
|
| 3480 | ext4_group_t first_not_zeroed);
|
| 3481 |
|
| 3482 | static inline int ext4_has_group_desc_csum(struct super_block *sb)
|
| 3483 | {
|
| 3484 | return ext4_has_feature_gdt_csum(sb) ||
|
| 3485 | ext4_has_feature_metadata_csum(sb);
|
| 3486 | }
|
| 3487 |
|
| 3488 | #define ext4_read_incompat_64bit_val(es, name) \
|
| 3489 | (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
|
| 3490 | ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
|
| 3491 | le32_to_cpu(es->name##_lo))
|
| 3492 |
|
| 3493 | static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
|
| 3494 | {
|
| 3495 | return ext4_read_incompat_64bit_val(es, s_blocks_count);
|
| 3496 | }
|
| 3497 |
|
| 3498 | static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
|
| 3499 | {
|
| 3500 | return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
|
| 3501 | }
|
| 3502 |
|
| 3503 | static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
|
| 3504 | {
|
| 3505 | return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
|
| 3506 | }
|
| 3507 |
|
| 3508 | static inline void ext4_blocks_count_set(struct ext4_super_block *es,
|
| 3509 | ext4_fsblk_t blk)
|
| 3510 | {
|
| 3511 | es->s_blocks_count_lo = cpu_to_le32((u32)blk);
|
| 3512 | es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
|
| 3513 | }
|
| 3514 |
|
| 3515 | static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
|
| 3516 | ext4_fsblk_t blk)
|
| 3517 | {
|
| 3518 | es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
|
| 3519 | es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
|
| 3520 | }
|
| 3521 |
|
| 3522 | static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
|
| 3523 | ext4_fsblk_t blk)
|
| 3524 | {
|
| 3525 | es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
|
| 3526 | es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
|
| 3527 | }
|
| 3528 |
|
| 3529 | static inline loff_t ext4_isize(struct super_block *sb,
|
| 3530 | struct ext4_inode *raw_inode)
|
| 3531 | {
|
| 3532 | if (ext4_has_feature_largedir(sb) ||
|
| 3533 | S_ISREG(le16_to_cpu(raw_inode->i_mode)))
|
| 3534 | return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
|
| 3535 | le32_to_cpu(raw_inode->i_size_lo);
|
| 3536 |
|
| 3537 | return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
|
| 3538 | }
|
| 3539 |
|
| 3540 | static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
|
| 3541 | {
|
| 3542 | raw_inode->i_size_lo = cpu_to_le32(i_size);
|
| 3543 | raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
|
| 3544 | }
|
| 3545 |
|
| 3546 | |
| 3547 | * Reading s_groups_count requires using smp_rmb() afterwards. See
|
| 3548 | * the locking protocol documented in the comments of ext4_group_add()
|
| 3549 | * in resize.c
|
| 3550 |
|
| 3551 | static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
|
| 3552 | {
|
| 3553 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
|
| 3554 |
|
| 3555 | smp_rmb();
|
| 3556 | return ngroups;
|
| 3557 | }
|
| 3558 |
|
| 3559 | static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
|
| 3560 | ext4_group_t block_group)
|
| 3561 | {
|
| 3562 | return block_group >> sbi->s_log_groups_per_flex;
|
| 3563 | }
|
| 3564 |
|
| 3565 | static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
|
| 3566 | {
|
| 3567 | return 1 << sbi->s_log_groups_per_flex;
|
| 3568 | }
|
| 3569 |
|
| 3570 | static inline loff_t ext4_get_maxbytes(struct inode *inode)
|
| 3571 | {
|
| 3572 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
|
| 3573 | return inode->i_sb->s_maxbytes;
|
| 3574 | return EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
|
| 3575 | }
|
| 3576 |
|
| 3577 | #define ext4_std_error(sb, errno) \
|
| 3578 | do { \
|
| 3579 | if ((errno)) \
|
| 3580 | __ext4_std_error((sb), __func__, __LINE__, (errno)); \
|
| 3581 | } while (0)
|
| 3582 |
|
| 3583 | #ifdef CONFIG_SMP
|
| 3584 | |
| 3585 | * counters. So we need to make sure we have free clusters more
|
| 3586 | * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
|
| 3587 |
|
| 3588 | #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
|
| 3589 | #else
|
| 3590 | #define EXT4_FREECLUSTERS_WATERMARK 0
|
| 3591 | #endif
|
| 3592 |
|
| 3593 |
|
| 3594 | static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
|
| 3595 | {
|
| 3596 | WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
|
| 3597 | !inode_is_locked(inode));
|
| 3598 | down_write(&EXT4_I(inode)->i_data_sem);
|
| 3599 | if (newsize > EXT4_I(inode)->i_disksize)
|
| 3600 | WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
|
| 3601 | up_write(&EXT4_I(inode)->i_data_sem);
|
| 3602 | }
|
| 3603 |
|
| 3604 |
|
| 3605 | static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
|
| 3606 | {
|
| 3607 | int changed = 0;
|
| 3608 |
|
| 3609 | if (newsize > inode->i_size) {
|
| 3610 | i_size_write(inode, newsize);
|
| 3611 | changed = 1;
|
| 3612 | }
|
| 3613 | if (newsize > EXT4_I(inode)->i_disksize) {
|
| 3614 | ext4_update_i_disksize(inode, newsize);
|
| 3615 | changed |= 2;
|
| 3616 | }
|
| 3617 | return changed;
|
| 3618 | }
|
| 3619 |
|
| 3620 | int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
|
| 3621 | loff_t len);
|
| 3622 |
|
| 3623 | struct ext4_group_info {
|
| 3624 | unsigned long bb_state;
|
| 3625 | #ifdef AGGRESSIVE_CHECK
|
| 3626 | unsigned long bb_check_counter;
|
| 3627 | #endif
|
| 3628 | struct rb_root bb_free_root;
|
| 3629 | ext4_grpblk_t bb_first_free;
|
| 3630 | ext4_grpblk_t bb_free;
|
| 3631 | ext4_grpblk_t bb_fragments;
|
| 3632 | int bb_avg_fragment_size_order; |
| 3633 | fragment in BG
|
| 3634 | ext4_grpblk_t bb_largest_free_order;
|
| 3635 | ext4_group_t bb_group;
|
| 3636 | struct list_head bb_prealloc_list;
|
| 3637 | #ifdef DOUBLE_CHECK
|
| 3638 | void *bb_bitmap;
|
| 3639 | #endif
|
| 3640 | struct rw_semaphore alloc_sem;
|
| 3641 | ext4_grpblk_t bb_counters[]; |
| 3642 | * regions, index is order.
|
| 3643 | * bb_counters[3] = 5 means
|
| 3644 | * 5 free 8-block regions.
|
| 3645 | };
|
| 3646 |
|
| 3647 | #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
|
| 3648 | #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
|
| 3649 | #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
|
| 3650 | #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
|
| 3651 | #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
|
| 3652 | (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
|
| 3653 | #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
|
| 3654 | (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
|
| 3655 | #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
|
| 3656 |
|
| 3657 | #define EXT4_MB_GRP_NEED_INIT(grp) \
|
| 3658 | (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
|
| 3659 | #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
|
| 3660 | (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
|
| 3661 | #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
|
| 3662 | (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
|
| 3663 |
|
| 3664 | #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
|
| 3665 | (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
|
| 3666 | #define EXT4_MB_GRP_SET_TRIMMED(grp) \
|
| 3667 | (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
|
| 3668 | #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
|
| 3669 | (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
|
| 3670 | #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
|
| 3671 | (ext4_mb_grp_test_and_set_read((grp)))
|
| 3672 |
|
| 3673 | static inline int ext4_mb_grp_test_and_set_read(struct ext4_group_info *grp)
|
| 3674 | {
|
| 3675 | return (test_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &grp->bb_state) ||
|
| 3676 | test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &grp->bb_state));
|
| 3677 | }
|
| 3678 |
|
| 3679 | #define EXT4_MAX_CONTENTION 8
|
| 3680 | #define EXT4_CONTENTION_THRESHOLD 2
|
| 3681 |
|
| 3682 | static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
|
| 3683 | ext4_group_t group)
|
| 3684 | {
|
| 3685 | return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
|
| 3686 | }
|
| 3687 |
|
| 3688 | |
| 3689 | * Returns true if the filesystem is busy enough that attempts to
|
| 3690 | * access the block group locks has run into contention.
|
| 3691 |
|
| 3692 | static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
|
| 3693 | {
|
| 3694 | return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
|
| 3695 | }
|
| 3696 |
|
| 3697 | static inline bool ext4_try_lock_group(struct super_block *sb, ext4_group_t group)
|
| 3698 | {
|
| 3699 | if (!spin_trylock(ext4_group_lock_ptr(sb, group)))
|
| 3700 | return false;
|
| 3701 | |
| 3702 | * We're able to grab the lock right away, so drop the lock
|
| 3703 | * contention counter.
|
| 3704 |
|
| 3705 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
|
| 3706 | return true;
|
| 3707 | }
|
| 3708 |
|
| 3709 | static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
|
| 3710 | {
|
| 3711 | if (!ext4_try_lock_group(sb, group)) {
|
| 3712 | |
| 3713 | * The lock is busy, so bump the contention counter,
|
| 3714 | * and then wait on the spin lock.
|
| 3715 |
|
| 3716 | atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
|
| 3717 | EXT4_MAX_CONTENTION);
|
| 3718 | spin_lock(ext4_group_lock_ptr(sb, group));
|
| 3719 | }
|
| 3720 | }
|
| 3721 |
|
| 3722 | static inline void ext4_unlock_group(struct super_block *sb,
|
| 3723 | ext4_group_t group)
|
| 3724 | {
|
| 3725 | spin_unlock(ext4_group_lock_ptr(sb, group));
|
| 3726 | }
|
| 3727 |
|
| 3728 | #ifdef CONFIG_QUOTA
|
| 3729 | static inline bool ext4_quota_capable(struct super_block *sb)
|
| 3730 | {
|
| 3731 | return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
|
| 3732 | }
|
| 3733 |
|
| 3734 | static inline bool ext4_is_quota_journalled(struct super_block *sb)
|
| 3735 | {
|
| 3736 | struct ext4_sb_info *sbi = EXT4_SB(sb);
|
| 3737 |
|
| 3738 | return (ext4_has_feature_quota(sb) ||
|
| 3739 | sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
|
| 3740 | }
|
| 3741 | int ext4_enable_quotas(struct super_block *sb);
|
| 3742 | #endif
|
| 3743 |
|
| 3744 | |
| 3745 | * Block validity checking
|
| 3746 |
|
| 3747 | #define ext4_check_indirect_blockref(inode, bh) \
|
| 3748 | ext4_check_blockref(__func__, __LINE__, inode, \
|
| 3749 | (__le32 *)(bh)->b_data, \
|
| 3750 | EXT4_ADDR_PER_BLOCK((inode)->i_sb))
|
| 3751 |
|
| 3752 | #define ext4_ind_check_inode(inode) \
|
| 3753 | ext4_check_blockref(__func__, __LINE__, inode, \
|
| 3754 | EXT4_I(inode)->i_data, \
|
| 3755 | EXT4_NDIR_BLOCKS)
|
| 3756 |
|
| 3757 | |
| 3758 | * Inodes and files operations
|
| 3759 |
|
| 3760 |
|
| 3761 |
|
| 3762 | extern const struct file_operations ext4_dir_operations;
|
| 3763 |
|
| 3764 |
|
| 3765 | extern const struct inode_operations ext4_file_inode_operations;
|
| 3766 | extern const struct file_operations ext4_file_operations;
|
| 3767 | extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
|
| 3768 |
|
| 3769 |
|
| 3770 | extern int ext4_get_max_inline_size(struct inode *inode);
|
| 3771 | extern int ext4_find_inline_data_nolock(struct inode *inode);
|
| 3772 | extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
|
| 3773 | extern void ext4_update_final_de(void *de_buf, int old_size, int new_size);
|
| 3774 |
|
| 3775 | int ext4_readpage_inline(struct inode *inode, struct folio *folio);
|
| 3776 | extern int ext4_try_to_write_inline_data(struct address_space *mapping,
|
| 3777 | struct inode *inode,
|
| 3778 | loff_t pos, unsigned len,
|
| 3779 | struct folio **foliop);
|
| 3780 | int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
|
| 3781 | unsigned copied, struct folio *folio);
|
| 3782 | extern int ext4_generic_write_inline_data(struct address_space *mapping,
|
| 3783 | struct inode *inode,
|
| 3784 | loff_t pos, unsigned len,
|
| 3785 | struct folio **foliop,
|
| 3786 | bool da);
|
| 3787 | extern int ext4_try_add_inline_entry(handle_t *handle,
|
| 3788 | struct ext4_filename *fname,
|
| 3789 | struct inode *dir, struct inode *inode);
|
| 3790 | extern int ext4_try_create_inline_dir(handle_t *handle,
|
| 3791 | struct inode *parent,
|
| 3792 | struct inode *inode);
|
| 3793 | extern int ext4_read_inline_dir(struct file *filp,
|
| 3794 | struct dir_context *ctx,
|
| 3795 | int *has_inline_data);
|
| 3796 | extern int ext4_inlinedir_to_tree(struct file *dir_file,
|
| 3797 | struct inode *dir, ext4_lblk_t block,
|
| 3798 | struct dx_hash_info *hinfo,
|
| 3799 | __u32 start_hash, __u32 start_minor_hash,
|
| 3800 | int *has_inline_data);
|
| 3801 | extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
|
| 3802 | struct ext4_filename *fname,
|
| 3803 | struct ext4_dir_entry_2 **res_dir,
|
| 3804 | int *has_inline_data);
|
| 3805 | extern int ext4_delete_inline_entry(handle_t *handle,
|
| 3806 | struct inode *dir,
|
| 3807 | struct ext4_dir_entry_2 *de_del,
|
| 3808 | struct buffer_head *bh,
|
| 3809 | int *has_inline_data);
|
| 3810 | extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
|
| 3811 | extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
|
| 3812 | struct ext4_dir_entry_2 **parent_de,
|
| 3813 | int *retval);
|
| 3814 | extern void *ext4_read_inline_link(struct inode *inode);
|
| 3815 |
|
| 3816 | struct iomap;
|
| 3817 | extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
|
| 3818 |
|
| 3819 | extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
|
| 3820 |
|
| 3821 | extern int ext4_convert_inline_data(struct inode *inode);
|
| 3822 |
|
| 3823 | static inline int ext4_has_inline_data(struct inode *inode)
|
| 3824 | {
|
| 3825 | return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
|
| 3826 | EXT4_I(inode)->i_inline_off;
|
| 3827 | }
|
| 3828 |
|
| 3829 |
|
| 3830 | extern const struct inode_operations ext4_dir_inode_operations;
|
| 3831 | extern const struct inode_operations ext4_special_inode_operations;
|
| 3832 | extern struct dentry *ext4_get_parent(struct dentry *child);
|
| 3833 | extern int ext4_init_dirblock(handle_t *handle, struct inode *inode,
|
| 3834 | struct buffer_head *dir_block,
|
| 3835 | unsigned int parent_ino, void *inline_buf,
|
| 3836 | int inline_size);
|
| 3837 | extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
|
| 3838 | unsigned int blocksize);
|
| 3839 | extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
|
| 3840 | struct buffer_head *bh);
|
| 3841 | extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
|
| 3842 | struct inode *inode, struct dentry *dentry);
|
| 3843 | extern int __ext4_link(struct inode *dir, struct inode *inode,
|
| 3844 | const struct qstr *d_name, struct dentry *dentry);
|
| 3845 |
|
| 3846 | #define S_SHIFT 12
|
| 3847 | static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
|
| 3848 | [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
|
| 3849 | [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
|
| 3850 | [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
|
| 3851 | [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
|
| 3852 | [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
|
| 3853 | [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
|
| 3854 | [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
|
| 3855 | };
|
| 3856 |
|
| 3857 | static inline void ext4_set_de_type(struct super_block *sb,
|
| 3858 | struct ext4_dir_entry_2 *de,
|
| 3859 | umode_t mode) {
|
| 3860 | if (ext4_has_feature_filetype(sb))
|
| 3861 | de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
|
| 3862 | }
|
| 3863 |
|
| 3864 |
|
| 3865 | int ext4_read_folio(struct file *file, struct folio *folio);
|
| 3866 | void ext4_readahead(struct readahead_control *rac);
|
| 3867 | int __init ext4_init_verity_caches(void);
|
| 3868 | void ext4_exit_verity_caches(void);
|
| 3869 |
|
| 3870 |
|
| 3871 | extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
|
| 3872 | extern const struct inode_operations ext4_symlink_inode_operations;
|
| 3873 | extern const struct inode_operations ext4_fast_symlink_inode_operations;
|
| 3874 |
|
| 3875 |
|
| 3876 | extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
|
| 3877 | extern int ext4_register_sysfs(struct super_block *sb);
|
| 3878 | extern void ext4_unregister_sysfs(struct super_block *sb);
|
| 3879 | extern int __init ext4_init_sysfs(void);
|
| 3880 | extern void ext4_exit_sysfs(void);
|
| 3881 |
|
| 3882 |
|
| 3883 | extern void ext4_release_system_zone(struct super_block *sb);
|
| 3884 | extern int ext4_setup_system_zone(struct super_block *sb);
|
| 3885 | extern int __init ext4_init_system_zone(void);
|
| 3886 | extern void ext4_exit_system_zone(void);
|
| 3887 | extern int ext4_inode_block_valid(struct inode *inode,
|
| 3888 | ext4_fsblk_t start_blk,
|
| 3889 | unsigned int count);
|
| 3890 | extern int ext4_check_blockref(const char *, unsigned int,
|
| 3891 | struct inode *, __le32 *, unsigned int);
|
| 3892 | extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
|
| 3893 | ext4_fsblk_t start_blk, unsigned int count);
|
| 3894 |
|
| 3895 |
|
| 3896 |
|
| 3897 | struct ext4_ext_path;
|
| 3898 | struct ext4_extent;
|
| 3899 |
|
| 3900 | |
| 3901 | * Maximum number of logical blocks in a file; ext4_extent's ee_block is
|
| 3902 | * __le32.
|
| 3903 |
|
| 3904 | #define EXT_MAX_BLOCKS 0xffffffff
|
| 3905 |
|
| 3906 | extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
|
| 3907 | extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
|
| 3908 | extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
|
| 3909 | struct ext4_map_blocks *map, int flags);
|
| 3910 | extern int ext4_ext_truncate(handle_t *, struct inode *);
|
| 3911 | extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
|
| 3912 | ext4_lblk_t end);
|
| 3913 | extern void ext4_ext_init(struct super_block *);
|
| 3914 | extern void ext4_ext_release(struct super_block *);
|
| 3915 | extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
|
| 3916 | loff_t len);
|
| 3917 | extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
|
| 3918 | loff_t offset, ssize_t len,
|
| 3919 | ext4_lblk_t *converted);
|
| 3920 | extern int ext4_convert_unwritten_extents_atomic(handle_t *handle,
|
| 3921 | struct inode *inode, loff_t offset, ssize_t len);
|
| 3922 | extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
|
| 3923 | ext4_io_end_t *io_end);
|
| 3924 | extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
|
| 3925 | struct ext4_map_blocks *map, int flags);
|
| 3926 | extern int ext4_map_query_blocks(handle_t *handle, struct inode *inode,
|
| 3927 | struct ext4_map_blocks *map, int flags);
|
| 3928 | extern int ext4_map_create_blocks(handle_t *handle, struct inode *inode,
|
| 3929 | struct ext4_map_blocks *map, int flags);
|
| 3930 | extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
|
| 3931 | int num,
|
| 3932 | struct ext4_ext_path *path);
|
| 3933 | extern struct ext4_ext_path *ext4_ext_insert_extent(
|
| 3934 | handle_t *handle, struct inode *inode,
|
| 3935 | struct ext4_ext_path *path,
|
| 3936 | struct ext4_extent *newext, int gb_flags);
|
| 3937 | extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
|
| 3938 | struct ext4_ext_path *,
|
| 3939 | int flags);
|
| 3940 | extern void ext4_free_ext_path(struct ext4_ext_path *);
|
| 3941 | extern int ext4_ext_check_inode(struct inode *inode);
|
| 3942 | extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
|
| 3943 | extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
|
| 3944 | __u64 start, __u64 len);
|
| 3945 | extern int ext4_get_es_cache(struct inode *inode,
|
| 3946 | struct fiemap_extent_info *fieinfo,
|
| 3947 | __u64 start, __u64 len);
|
| 3948 | extern int ext4_ext_precache(struct inode *inode);
|
| 3949 | extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
|
| 3950 | struct inode *inode2, ext4_lblk_t lblk1,
|
| 3951 | ext4_lblk_t lblk2, ext4_lblk_t count,
|
| 3952 | int mark_unwritten,int *err);
|
| 3953 | extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
|
| 3954 | extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
|
| 3955 | int check_cred, int restart_cred,
|
| 3956 | int revoke_cred);
|
| 3957 | extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
|
| 3958 | extern int ext4_ext_replay_set_iblocks(struct inode *inode);
|
| 3959 | extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
|
| 3960 | int len, int unwritten, ext4_fsblk_t pblk);
|
| 3961 | extern int ext4_ext_clear_bb(struct inode *inode);
|
| 3962 |
|
| 3963 |
|
| 3964 |
|
| 3965 | extern void ext4_double_down_write_data_sem(struct inode *first,
|
| 3966 | struct inode *second);
|
| 3967 | extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
|
| 3968 | struct inode *donor_inode);
|
| 3969 | extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
|
| 3970 | __u64 start_orig, __u64 start_donor,
|
| 3971 | __u64 len, __u64 *moved_len);
|
| 3972 |
|
| 3973 |
|
| 3974 | extern int __init ext4_init_pageio(void);
|
| 3975 | extern void ext4_exit_pageio(void);
|
| 3976 | extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
|
| 3977 | extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
|
| 3978 | extern int ext4_put_io_end(ext4_io_end_t *io_end);
|
| 3979 | extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
|
| 3980 | extern void ext4_io_submit_init(struct ext4_io_submit *io,
|
| 3981 | struct writeback_control *wbc);
|
| 3982 | extern void ext4_end_io_rsv_work(struct work_struct *work);
|
| 3983 | extern void ext4_io_submit(struct ext4_io_submit *io);
|
| 3984 | void ext4_bio_write_folio(struct ext4_io_submit *io, struct folio *page,
|
| 3985 | size_t len);
|
| 3986 | extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
|
| 3987 | extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
|
| 3988 |
|
| 3989 |
|
| 3990 | extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
|
| 3991 |
|
| 3992 |
|
| 3993 | extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
|
| 3994 |
|
| 3995 |
|
| 3996 | extern const struct fsverity_operations ext4_verityops;
|
| 3997 |
|
| 3998 |
|
| 3999 | extern int ext4_orphan_add(handle_t *, struct inode *);
|
| 4000 | extern int ext4_orphan_del(handle_t *, struct inode *);
|
| 4001 | extern void ext4_orphan_cleanup(struct super_block *sb,
|
| 4002 | struct ext4_super_block *es);
|
| 4003 | extern void ext4_release_orphan_info(struct super_block *sb);
|
| 4004 | extern int ext4_init_orphan_info(struct super_block *sb);
|
| 4005 | extern int ext4_orphan_file_empty(struct super_block *sb);
|
| 4006 | extern void ext4_orphan_file_block_trigger(
|
| 4007 | struct jbd2_buffer_trigger_type *triggers,
|
| 4008 | struct buffer_head *bh,
|
| 4009 | void *data, size_t size);
|
| 4010 |
|
| 4011 | |
| 4012 | * Add new method to test whether block and inode bitmaps are properly
|
| 4013 | * initialized. With uninit_bg reading the block from disk is not enough
|
| 4014 | * to mark the bitmap uptodate. We need to also zero-out the bitmap
|
| 4015 |
|
| 4016 | #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
|
| 4017 |
|
| 4018 | static inline int bitmap_uptodate(struct buffer_head *bh)
|
| 4019 | {
|
| 4020 | return (buffer_uptodate(bh) &&
|
| 4021 | test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
|
| 4022 | }
|
| 4023 | static inline void set_bitmap_uptodate(struct buffer_head *bh)
|
| 4024 | {
|
| 4025 | set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
|
| 4026 | }
|
| 4027 |
|
| 4028 | extern int ext4_resize_begin(struct super_block *sb);
|
| 4029 | extern int ext4_resize_end(struct super_block *sb, bool update_backups);
|
| 4030 |
|
| 4031 | static inline void ext4_set_io_unwritten_flag(struct ext4_io_end *io_end)
|
| 4032 | {
|
| 4033 | if (!(io_end->flag & EXT4_IO_END_UNWRITTEN))
|
| 4034 | io_end->flag |= EXT4_IO_END_UNWRITTEN;
|
| 4035 | }
|
| 4036 |
|
| 4037 | static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
|
| 4038 | {
|
| 4039 | if (io_end->flag & EXT4_IO_END_UNWRITTEN)
|
| 4040 | io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
|
| 4041 | }
|
| 4042 |
|
| 4043 | extern const struct iomap_ops ext4_iomap_ops;
|
| 4044 | extern const struct iomap_ops ext4_iomap_report_ops;
|
| 4045 |
|
| 4046 | int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
|
| 4047 | unsigned flags, struct iomap *iomap, struct iomap *srcmap);
|
| 4048 |
|
| 4049 | static inline int ext4_buffer_uptodate(struct buffer_head *bh)
|
| 4050 | {
|
| 4051 | |
| 4052 | * If the buffer has the write error flag, we have failed
|
| 4053 | * to write out data in the block. In this case, we don't
|
| 4054 | * have to read the block because we may read the old data
|
| 4055 | * successfully.
|
| 4056 |
|
| 4057 | if (buffer_write_io_error(bh))
|
| 4058 | set_buffer_uptodate(bh);
|
| 4059 | return buffer_uptodate(bh);
|
| 4060 | }
|
| 4061 |
|
| 4062 | static inline bool ext4_inode_can_atomic_write(struct inode *inode)
|
| 4063 | {
|
| 4064 |
|
| 4065 | return S_ISREG(inode->i_mode) &&
|
| 4066 | ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
|
| 4067 | EXT4_SB(inode->i_sb)->s_awu_min > 0;
|
| 4068 | }
|
| 4069 |
|
| 4070 | extern int ext4_block_write_begin(handle_t *handle, struct folio *folio,
|
| 4071 | loff_t pos, unsigned len,
|
| 4072 | get_block_t *get_block);
|
| 4073 |
|
| 4074 | #if IS_ENABLED(CONFIG_EXT4_KUNIT_TESTS)
|
| 4075 | #define EXPORT_SYMBOL_FOR_EXT4_TEST(sym) \
|
| 4076 | EXPORT_SYMBOL_FOR_MODULES(sym, "ext4-test")
|
| 4077 | #endif
|
| 4078 | #endif
|
| 4079 |
|
| 4080 | #endif
|