1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2017-2018 HUAWEI, Inc. 4 * https://www.huawei.com/ 5 * Copyright (C) 2021, Alibaba Cloud 6 */ 7 #ifndef __EROFS_INTERNAL_H 8 #define __EROFS_INTERNAL_H 9 10 #include <linux/fs.h> 11 #include <linux/dcache.h> 12 #include <linux/mm.h> 13 #include <linux/pagemap.h> 14 #include <linux/bio.h> 15 #include <linux/buffer_head.h> 16 #include <linux/magic.h> 17 #include <linux/slab.h> 18 #include <linux/vmalloc.h> 19 #include <linux/iomap.h> 20 #include "erofs_fs.h" 21 22 /* redefine pr_fmt "erofs: " */ 23 #undef pr_fmt 24 #define pr_fmt(fmt) "erofs: " fmt 25 26 __printf(3, 4) void _erofs_err(struct super_block *sb, 27 const char *function, const char *fmt, ...); 28 #define erofs_err(sb, fmt, ...) \ 29 _erofs_err(sb, __func__, fmt "\n", ##__VA_ARGS__) 30 __printf(3, 4) void _erofs_info(struct super_block *sb, 31 const char *function, const char *fmt, ...); 32 #define erofs_info(sb, fmt, ...) \ 33 _erofs_info(sb, __func__, fmt "\n", ##__VA_ARGS__) 34 #ifdef CONFIG_EROFS_FS_DEBUG 35 #define erofs_dbg(x, ...) pr_debug(x "\n", ##__VA_ARGS__) 36 #define DBG_BUGON BUG_ON 37 #else 38 #define erofs_dbg(x, ...) ((void)0) 39 #define DBG_BUGON(x) ((void)(x)) 40 #endif /* !CONFIG_EROFS_FS_DEBUG */ 41 42 /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */ 43 #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1 44 45 typedef u64 erofs_nid_t; 46 typedef u64 erofs_off_t; 47 /* data type for filesystem-wide blocks number */ 48 typedef u32 erofs_blk_t; 49 50 struct erofs_device_info { 51 char *path; 52 struct erofs_fscache *fscache; 53 struct block_device *bdev; 54 struct dax_device *dax_dev; 55 u64 dax_part_off; 56 57 u32 blocks; 58 u32 mapped_blkaddr; 59 }; 60 61 enum { 62 EROFS_SYNC_DECOMPRESS_AUTO, 63 EROFS_SYNC_DECOMPRESS_FORCE_ON, 64 EROFS_SYNC_DECOMPRESS_FORCE_OFF 65 }; 66 67 struct erofs_mount_opts { 68 #ifdef CONFIG_EROFS_FS_ZIP 69 /* current strategy of how to use managed cache */ 70 unsigned char cache_strategy; 71 /* strategy of sync decompression (0 - auto, 1 - force on, 2 - force off) */ 72 unsigned int sync_decompress; 73 74 /* threshold for decompression synchronously */ 75 unsigned int max_sync_decompress_pages; 76 #endif 77 unsigned int mount_opt; 78 char *fsid; 79 }; 80 81 struct erofs_dev_context { 82 struct idr tree; 83 struct rw_semaphore rwsem; 84 85 unsigned int extra_devices; 86 }; 87 88 struct erofs_fs_context { 89 struct erofs_mount_opts opt; 90 struct erofs_dev_context *devs; 91 }; 92 93 /* all filesystem-wide lz4 configurations */ 94 struct erofs_sb_lz4_info { 95 /* # of pages needed for EROFS lz4 rolling decompression */ 96 u16 max_distance_pages; 97 /* maximum possible blocks for pclusters in the filesystem */ 98 u16 max_pclusterblks; 99 }; 100 101 struct erofs_fscache { 102 struct fscache_cookie *cookie; 103 struct inode *inode; 104 }; 105 106 struct erofs_sb_info { 107 struct erofs_mount_opts opt; /* options */ 108 #ifdef CONFIG_EROFS_FS_ZIP 109 /* list for all registered superblocks, mainly for shrinker */ 110 struct list_head list; 111 struct mutex umount_mutex; 112 113 /* managed XArray arranged in physical block number */ 114 struct xarray managed_pslots; 115 116 unsigned int shrinker_run_no; 117 u16 available_compr_algs; 118 119 /* pseudo inode to manage cached pages */ 120 struct inode *managed_cache; 121 122 struct erofs_sb_lz4_info lz4; 123 #endif /* CONFIG_EROFS_FS_ZIP */ 124 struct erofs_dev_context *devs; 125 struct dax_device *dax_dev; 126 u64 dax_part_off; 127 u64 total_blocks; 128 u32 primarydevice_blocks; 129 130 u32 meta_blkaddr; 131 #ifdef CONFIG_EROFS_FS_XATTR 132 u32 xattr_blkaddr; 133 #endif 134 u16 device_id_mask; /* valid bits of device id to be used */ 135 136 /* inode slot unit size in bit shift */ 137 unsigned char islotbits; 138 139 u32 sb_size; /* total superblock size */ 140 u32 build_time_nsec; 141 u64 build_time; 142 143 /* what we really care is nid, rather than ino.. */ 144 erofs_nid_t root_nid; 145 /* used for statfs, f_files - f_favail */ 146 u64 inos; 147 148 u8 uuid[16]; /* 128-bit uuid for volume */ 149 u8 volume_name[16]; /* volume name */ 150 u32 feature_compat; 151 u32 feature_incompat; 152 153 /* sysfs support */ 154 struct kobject s_kobj; /* /sys/fs/erofs/<devname> */ 155 struct completion s_kobj_unregister; 156 157 /* fscache support */ 158 struct fscache_volume *volume; 159 struct erofs_fscache *s_fscache; 160 }; 161 162 #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) 163 #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) 164 165 /* Mount flags set via mount options or defaults */ 166 #define EROFS_MOUNT_XATTR_USER 0x00000010 167 #define EROFS_MOUNT_POSIX_ACL 0x00000020 168 #define EROFS_MOUNT_DAX_ALWAYS 0x00000040 169 #define EROFS_MOUNT_DAX_NEVER 0x00000080 170 171 #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option) 172 #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option) 173 #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option) 174 175 static inline bool erofs_is_fscache_mode(struct super_block *sb) 176 { 177 return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !sb->s_bdev; 178 } 179 180 enum { 181 EROFS_ZIP_CACHE_DISABLED, 182 EROFS_ZIP_CACHE_READAHEAD, 183 EROFS_ZIP_CACHE_READAROUND 184 }; 185 186 #ifdef CONFIG_EROFS_FS_ZIP 187 #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL) 188 189 /* basic unit of the workstation of a super_block */ 190 struct erofs_workgroup { 191 /* the workgroup index in the workstation */ 192 pgoff_t index; 193 194 /* overall workgroup reference count */ 195 atomic_t refcount; 196 }; 197 198 #if defined(CONFIG_SMP) 199 static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 200 int val) 201 { 202 preempt_disable(); 203 if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) { 204 preempt_enable(); 205 return false; 206 } 207 return true; 208 } 209 210 static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 211 int orig_val) 212 { 213 /* 214 * other observers should notice all modifications 215 * in the freezing period. 216 */ 217 smp_mb(); 218 atomic_set(&grp->refcount, orig_val); 219 preempt_enable(); 220 } 221 222 static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 223 { 224 return atomic_cond_read_relaxed(&grp->refcount, 225 VAL != EROFS_LOCKED_MAGIC); 226 } 227 #else 228 static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 229 int val) 230 { 231 preempt_disable(); 232 /* no need to spin on UP platforms, let's just disable preemption. */ 233 if (val != atomic_read(&grp->refcount)) { 234 preempt_enable(); 235 return false; 236 } 237 return true; 238 } 239 240 static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 241 int orig_val) 242 { 243 preempt_enable(); 244 } 245 246 static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 247 { 248 int v = atomic_read(&grp->refcount); 249 250 /* workgroup is never freezed on uniprocessor systems */ 251 DBG_BUGON(v == EROFS_LOCKED_MAGIC); 252 return v; 253 } 254 #endif /* !CONFIG_SMP */ 255 #endif /* !CONFIG_EROFS_FS_ZIP */ 256 257 /* we strictly follow PAGE_SIZE and no buffer head yet */ 258 #define LOG_BLOCK_SIZE PAGE_SHIFT 259 260 #undef LOG_SECTORS_PER_BLOCK 261 #define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) 262 263 #undef SECTORS_PER_BLOCK 264 #define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK) 265 266 #define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE) 267 268 #if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ) 269 #error erofs cannot be used in this platform 270 #endif 271 272 enum erofs_kmap_type { 273 EROFS_NO_KMAP, /* don't map the buffer */ 274 EROFS_KMAP, /* use kmap() to map the buffer */ 275 EROFS_KMAP_ATOMIC, /* use kmap_atomic() to map the buffer */ 276 }; 277 278 struct erofs_buf { 279 struct page *page; 280 void *base; 281 enum erofs_kmap_type kmap_type; 282 }; 283 #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL }) 284 285 #define ROOT_NID(sb) ((sb)->root_nid) 286 287 #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) 288 #define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ) 289 #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ) 290 291 static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid) 292 { 293 return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits); 294 } 295 296 #define EROFS_FEATURE_FUNCS(name, compat, feature) \ 297 static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \ 298 { \ 299 return sbi->feature_##compat & EROFS_FEATURE_##feature; \ 300 } 301 302 EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING) 303 EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS) 304 EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER) 305 EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE) 306 EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE) 307 EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2) 308 EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING) 309 EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) 310 311 /* atomic flag definitions */ 312 #define EROFS_I_EA_INITED_BIT 0 313 #define EROFS_I_Z_INITED_BIT 1 314 315 /* bitlock definitions (arranged in reverse order) */ 316 #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) 317 #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) 318 319 struct erofs_inode { 320 erofs_nid_t nid; 321 322 /* atomic flags (including bitlocks) */ 323 unsigned long flags; 324 325 unsigned char datalayout; 326 unsigned char inode_isize; 327 unsigned short xattr_isize; 328 329 unsigned int xattr_shared_count; 330 unsigned int *xattr_shared_xattrs; 331 332 union { 333 erofs_blk_t raw_blkaddr; 334 struct { 335 unsigned short chunkformat; 336 unsigned char chunkbits; 337 }; 338 #ifdef CONFIG_EROFS_FS_ZIP 339 struct { 340 unsigned short z_advise; 341 unsigned char z_algorithmtype[2]; 342 unsigned char z_logical_clusterbits; 343 unsigned long z_tailextent_headlcn; 344 erofs_off_t z_idataoff; 345 unsigned short z_idata_size; 346 }; 347 #endif /* CONFIG_EROFS_FS_ZIP */ 348 }; 349 /* the corresponding vfs inode */ 350 struct inode vfs_inode; 351 }; 352 353 #define EROFS_I(ptr) \ 354 container_of(ptr, struct erofs_inode, vfs_inode) 355 356 static inline unsigned long erofs_inode_datablocks(struct inode *inode) 357 { 358 /* since i_size cannot be changed */ 359 return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ); 360 } 361 362 static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit, 363 unsigned int bits) 364 { 365 366 return (value >> bit) & ((1 << bits) - 1); 367 } 368 369 370 static inline unsigned int erofs_inode_version(unsigned int value) 371 { 372 return erofs_bitrange(value, EROFS_I_VERSION_BIT, 373 EROFS_I_VERSION_BITS); 374 } 375 376 static inline unsigned int erofs_inode_datalayout(unsigned int value) 377 { 378 return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT, 379 EROFS_I_DATALAYOUT_BITS); 380 } 381 382 /* 383 * Different from grab_cache_page_nowait(), reclaiming is never triggered 384 * when allocating new pages. 385 */ 386 static inline 387 struct page *erofs_grab_cache_page_nowait(struct address_space *mapping, 388 pgoff_t index) 389 { 390 return pagecache_get_page(mapping, index, 391 FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT, 392 readahead_gfp_mask(mapping) & ~__GFP_RECLAIM); 393 } 394 395 extern const struct super_operations erofs_sops; 396 397 extern const struct address_space_operations erofs_raw_access_aops; 398 extern const struct address_space_operations z_erofs_aops; 399 400 enum { 401 BH_Encoded = BH_PrivateStart, 402 BH_FullMapped, 403 }; 404 405 /* Has a disk mapping */ 406 #define EROFS_MAP_MAPPED (1 << BH_Mapped) 407 /* Located in metadata (could be copied from bd_inode) */ 408 #define EROFS_MAP_META (1 << BH_Meta) 409 /* The extent is encoded */ 410 #define EROFS_MAP_ENCODED (1 << BH_Encoded) 411 /* The length of extent is full */ 412 #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) 413 414 struct erofs_map_blocks { 415 struct erofs_buf buf; 416 417 erofs_off_t m_pa, m_la; 418 u64 m_plen, m_llen; 419 420 unsigned short m_deviceid; 421 char m_algorithmformat; 422 unsigned int m_flags; 423 }; 424 425 /* Flags used by erofs_map_blocks_flatmode() */ 426 #define EROFS_GET_BLOCKS_RAW 0x0001 427 /* 428 * Used to get the exact decompressed length, e.g. fiemap (consider lookback 429 * approach instead if possible since it's more metadata lightweight.) 430 */ 431 #define EROFS_GET_BLOCKS_FIEMAP 0x0002 432 /* Used to map the whole extent if non-negligible data is requested for LZMA */ 433 #define EROFS_GET_BLOCKS_READMORE 0x0004 434 /* Used to map tail extent for tailpacking inline pcluster */ 435 #define EROFS_GET_BLOCKS_FINDTAIL 0x0008 436 437 enum { 438 Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX, 439 Z_EROFS_COMPRESSION_RUNTIME_MAX 440 }; 441 442 /* zmap.c */ 443 extern const struct iomap_ops z_erofs_iomap_report_ops; 444 445 #ifdef CONFIG_EROFS_FS_ZIP 446 int z_erofs_fill_inode(struct inode *inode); 447 int z_erofs_map_blocks_iter(struct inode *inode, 448 struct erofs_map_blocks *map, 449 int flags); 450 #else 451 static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; } 452 static inline int z_erofs_map_blocks_iter(struct inode *inode, 453 struct erofs_map_blocks *map, 454 int flags) 455 { 456 return -EOPNOTSUPP; 457 } 458 #endif /* !CONFIG_EROFS_FS_ZIP */ 459 460 struct erofs_map_dev { 461 struct erofs_fscache *m_fscache; 462 struct block_device *m_bdev; 463 struct dax_device *m_daxdev; 464 u64 m_dax_part_off; 465 466 erofs_off_t m_pa; 467 unsigned int m_deviceid; 468 }; 469 470 /* data.c */ 471 extern const struct file_operations erofs_file_fops; 472 void erofs_unmap_metabuf(struct erofs_buf *buf); 473 void erofs_put_metabuf(struct erofs_buf *buf); 474 void *erofs_bread(struct erofs_buf *buf, struct inode *inode, 475 erofs_blk_t blkaddr, enum erofs_kmap_type type); 476 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb, 477 erofs_blk_t blkaddr, enum erofs_kmap_type type); 478 int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev); 479 int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 480 u64 start, u64 len); 481 int erofs_map_blocks(struct inode *inode, 482 struct erofs_map_blocks *map, int flags); 483 484 /* inode.c */ 485 static inline unsigned long erofs_inode_hash(erofs_nid_t nid) 486 { 487 #if BITS_PER_LONG == 32 488 return (nid >> 32) ^ (nid & 0xffffffff); 489 #else 490 return nid; 491 #endif 492 } 493 494 extern const struct inode_operations erofs_generic_iops; 495 extern const struct inode_operations erofs_symlink_iops; 496 extern const struct inode_operations erofs_fast_symlink_iops; 497 498 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir); 499 int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path, 500 struct kstat *stat, u32 request_mask, 501 unsigned int query_flags); 502 503 /* namei.c */ 504 extern const struct inode_operations erofs_dir_iops; 505 506 int erofs_namei(struct inode *dir, const struct qstr *name, 507 erofs_nid_t *nid, unsigned int *d_type); 508 509 /* dir.c */ 510 extern const struct file_operations erofs_dir_fops; 511 512 static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count) 513 { 514 int retried = 0; 515 516 while (1) { 517 void *p = vm_map_ram(pages, count, -1); 518 519 /* retry two more times (totally 3 times) */ 520 if (p || ++retried >= 3) 521 return p; 522 vm_unmap_aliases(); 523 } 524 return NULL; 525 } 526 527 /* pcpubuf.c */ 528 void *erofs_get_pcpubuf(unsigned int requiredpages); 529 void erofs_put_pcpubuf(void *ptr); 530 int erofs_pcpubuf_growsize(unsigned int nrpages); 531 void erofs_pcpubuf_init(void); 532 void erofs_pcpubuf_exit(void); 533 534 /* sysfs.c */ 535 int erofs_register_sysfs(struct super_block *sb); 536 void erofs_unregister_sysfs(struct super_block *sb); 537 int __init erofs_init_sysfs(void); 538 void erofs_exit_sysfs(void); 539 540 /* utils.c / zdata.c */ 541 struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp); 542 static inline void erofs_pagepool_add(struct page **pagepool, 543 struct page *page) 544 { 545 set_page_private(page, (unsigned long)*pagepool); 546 *pagepool = page; 547 } 548 void erofs_release_pages(struct page **pagepool); 549 550 #ifdef CONFIG_EROFS_FS_ZIP 551 int erofs_workgroup_put(struct erofs_workgroup *grp); 552 struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, 553 pgoff_t index); 554 struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb, 555 struct erofs_workgroup *grp); 556 void erofs_workgroup_free_rcu(struct erofs_workgroup *grp); 557 void erofs_shrinker_register(struct super_block *sb); 558 void erofs_shrinker_unregister(struct super_block *sb); 559 int __init erofs_init_shrinker(void); 560 void erofs_exit_shrinker(void); 561 int __init z_erofs_init_zip_subsystem(void); 562 void z_erofs_exit_zip_subsystem(void); 563 int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 564 struct erofs_workgroup *egrp); 565 int erofs_try_to_free_cached_page(struct page *page); 566 int z_erofs_load_lz4_config(struct super_block *sb, 567 struct erofs_super_block *dsb, 568 struct z_erofs_lz4_cfgs *lz4, int len); 569 #else 570 static inline void erofs_shrinker_register(struct super_block *sb) {} 571 static inline void erofs_shrinker_unregister(struct super_block *sb) {} 572 static inline int erofs_init_shrinker(void) { return 0; } 573 static inline void erofs_exit_shrinker(void) {} 574 static inline int z_erofs_init_zip_subsystem(void) { return 0; } 575 static inline void z_erofs_exit_zip_subsystem(void) {} 576 static inline int z_erofs_load_lz4_config(struct super_block *sb, 577 struct erofs_super_block *dsb, 578 struct z_erofs_lz4_cfgs *lz4, int len) 579 { 580 if (lz4 || dsb->u1.lz4_max_distance) { 581 erofs_err(sb, "lz4 algorithm isn't enabled"); 582 return -EINVAL; 583 } 584 return 0; 585 } 586 #endif /* !CONFIG_EROFS_FS_ZIP */ 587 588 #ifdef CONFIG_EROFS_FS_ZIP_LZMA 589 int z_erofs_lzma_init(void); 590 void z_erofs_lzma_exit(void); 591 int z_erofs_load_lzma_config(struct super_block *sb, 592 struct erofs_super_block *dsb, 593 struct z_erofs_lzma_cfgs *lzma, int size); 594 #else 595 static inline int z_erofs_lzma_init(void) { return 0; } 596 static inline int z_erofs_lzma_exit(void) { return 0; } 597 static inline int z_erofs_load_lzma_config(struct super_block *sb, 598 struct erofs_super_block *dsb, 599 struct z_erofs_lzma_cfgs *lzma, int size) { 600 if (lzma) { 601 erofs_err(sb, "lzma algorithm isn't enabled"); 602 return -EINVAL; 603 } 604 return 0; 605 } 606 #endif /* !CONFIG_EROFS_FS_ZIP */ 607 608 /* fscache.c */ 609 #ifdef CONFIG_EROFS_FS_ONDEMAND 610 int erofs_fscache_register_fs(struct super_block *sb); 611 void erofs_fscache_unregister_fs(struct super_block *sb); 612 613 int erofs_fscache_register_cookie(struct super_block *sb, 614 struct erofs_fscache **fscache, 615 char *name, bool need_inode); 616 void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache); 617 618 extern const struct address_space_operations erofs_fscache_access_aops; 619 #else 620 static inline int erofs_fscache_register_fs(struct super_block *sb) 621 { 622 return 0; 623 } 624 static inline void erofs_fscache_unregister_fs(struct super_block *sb) {} 625 626 static inline int erofs_fscache_register_cookie(struct super_block *sb, 627 struct erofs_fscache **fscache, 628 char *name, bool need_inode) 629 { 630 return -EOPNOTSUPP; 631 } 632 633 static inline void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache) 634 { 635 } 636 #endif 637 638 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 639 640 #endif /* __EROFS_INTERNAL_H */ 641