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