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 }; 79 80 struct erofs_dev_context { 81 struct idr tree; 82 struct rw_semaphore rwsem; 83 84 unsigned int extra_devices; 85 }; 86 87 struct erofs_fs_context { 88 struct erofs_mount_opts opt; 89 struct erofs_dev_context *devs; 90 char *fsid; 91 char *domain_id; 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 char *fsid; 174 char *domain_id; 175 }; 176 177 #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) 178 #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) 179 180 /* Mount flags set via mount options or defaults */ 181 #define EROFS_MOUNT_XATTR_USER 0x00000010 182 #define EROFS_MOUNT_POSIX_ACL 0x00000020 183 #define EROFS_MOUNT_DAX_ALWAYS 0x00000040 184 #define EROFS_MOUNT_DAX_NEVER 0x00000080 185 186 #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option) 187 #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option) 188 #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option) 189 190 static inline bool erofs_is_fscache_mode(struct super_block *sb) 191 { 192 return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !sb->s_bdev; 193 } 194 195 enum { 196 EROFS_ZIP_CACHE_DISABLED, 197 EROFS_ZIP_CACHE_READAHEAD, 198 EROFS_ZIP_CACHE_READAROUND 199 }; 200 201 #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL) 202 203 /* basic unit of the workstation of a super_block */ 204 struct erofs_workgroup { 205 /* the workgroup index in the workstation */ 206 pgoff_t index; 207 208 /* overall workgroup reference count */ 209 atomic_t refcount; 210 }; 211 212 static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 213 int val) 214 { 215 preempt_disable(); 216 if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) { 217 preempt_enable(); 218 return false; 219 } 220 return true; 221 } 222 223 static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 224 int orig_val) 225 { 226 /* 227 * other observers should notice all modifications 228 * in the freezing period. 229 */ 230 smp_mb(); 231 atomic_set(&grp->refcount, orig_val); 232 preempt_enable(); 233 } 234 235 static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 236 { 237 return atomic_cond_read_relaxed(&grp->refcount, 238 VAL != EROFS_LOCKED_MAGIC); 239 } 240 241 /* we strictly follow PAGE_SIZE and no buffer head yet */ 242 #define LOG_BLOCK_SIZE PAGE_SHIFT 243 244 #undef LOG_SECTORS_PER_BLOCK 245 #define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) 246 247 #undef SECTORS_PER_BLOCK 248 #define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK) 249 250 #define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE) 251 252 #if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ) 253 #error erofs cannot be used in this platform 254 #endif 255 256 enum erofs_kmap_type { 257 EROFS_NO_KMAP, /* don't map the buffer */ 258 EROFS_KMAP, /* use kmap() to map the buffer */ 259 EROFS_KMAP_ATOMIC, /* use kmap_atomic() to map the buffer */ 260 }; 261 262 struct erofs_buf { 263 struct page *page; 264 void *base; 265 enum erofs_kmap_type kmap_type; 266 }; 267 #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL }) 268 269 #define ROOT_NID(sb) ((sb)->root_nid) 270 271 #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) 272 #define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ) 273 #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ) 274 275 static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid) 276 { 277 return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits); 278 } 279 280 #define EROFS_FEATURE_FUNCS(name, compat, feature) \ 281 static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \ 282 { \ 283 return sbi->feature_##compat & EROFS_FEATURE_##feature; \ 284 } 285 286 EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING) 287 EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS) 288 EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER) 289 EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE) 290 EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE) 291 EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2) 292 EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING) 293 EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS) 294 EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE) 295 EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) 296 297 /* atomic flag definitions */ 298 #define EROFS_I_EA_INITED_BIT 0 299 #define EROFS_I_Z_INITED_BIT 1 300 301 /* bitlock definitions (arranged in reverse order) */ 302 #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) 303 #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) 304 305 struct erofs_inode { 306 erofs_nid_t nid; 307 308 /* atomic flags (including bitlocks) */ 309 unsigned long flags; 310 311 unsigned char datalayout; 312 unsigned char inode_isize; 313 unsigned short xattr_isize; 314 315 unsigned int xattr_shared_count; 316 unsigned int *xattr_shared_xattrs; 317 318 union { 319 erofs_blk_t raw_blkaddr; 320 struct { 321 unsigned short chunkformat; 322 unsigned char chunkbits; 323 }; 324 #ifdef CONFIG_EROFS_FS_ZIP 325 struct { 326 unsigned short z_advise; 327 unsigned char z_algorithmtype[2]; 328 unsigned char z_logical_clusterbits; 329 unsigned long z_tailextent_headlcn; 330 union { 331 struct { 332 erofs_off_t z_idataoff; 333 unsigned short z_idata_size; 334 }; 335 erofs_off_t z_fragmentoff; 336 }; 337 }; 338 #endif /* CONFIG_EROFS_FS_ZIP */ 339 }; 340 /* the corresponding vfs inode */ 341 struct inode vfs_inode; 342 }; 343 344 #define EROFS_I(ptr) \ 345 container_of(ptr, struct erofs_inode, vfs_inode) 346 347 static inline unsigned long erofs_inode_datablocks(struct inode *inode) 348 { 349 /* since i_size cannot be changed */ 350 return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ); 351 } 352 353 static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit, 354 unsigned int bits) 355 { 356 357 return (value >> bit) & ((1 << bits) - 1); 358 } 359 360 361 static inline unsigned int erofs_inode_version(unsigned int value) 362 { 363 return erofs_bitrange(value, EROFS_I_VERSION_BIT, 364 EROFS_I_VERSION_BITS); 365 } 366 367 static inline unsigned int erofs_inode_datalayout(unsigned int value) 368 { 369 return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT, 370 EROFS_I_DATALAYOUT_BITS); 371 } 372 373 /* 374 * Different from grab_cache_page_nowait(), reclaiming is never triggered 375 * when allocating new pages. 376 */ 377 static inline 378 struct page *erofs_grab_cache_page_nowait(struct address_space *mapping, 379 pgoff_t index) 380 { 381 return pagecache_get_page(mapping, index, 382 FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT, 383 readahead_gfp_mask(mapping) & ~__GFP_RECLAIM); 384 } 385 386 extern const struct super_operations erofs_sops; 387 extern struct file_system_type erofs_fs_type; 388 389 extern const struct address_space_operations erofs_raw_access_aops; 390 extern const struct address_space_operations z_erofs_aops; 391 392 enum { 393 BH_Encoded = BH_PrivateStart, 394 BH_FullMapped, 395 BH_Fragment, 396 BH_Partialref, 397 }; 398 399 /* Has a disk mapping */ 400 #define EROFS_MAP_MAPPED (1 << BH_Mapped) 401 /* Located in metadata (could be copied from bd_inode) */ 402 #define EROFS_MAP_META (1 << BH_Meta) 403 /* The extent is encoded */ 404 #define EROFS_MAP_ENCODED (1 << BH_Encoded) 405 /* The length of extent is full */ 406 #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) 407 /* Located in the special packed inode */ 408 #define EROFS_MAP_FRAGMENT (1 << BH_Fragment) 409 /* The extent refers to partial decompressed data */ 410 #define EROFS_MAP_PARTIAL_REF (1 << BH_Partialref) 411 412 struct erofs_map_blocks { 413 struct erofs_buf buf; 414 415 erofs_off_t m_pa, m_la; 416 u64 m_plen, m_llen; 417 418 unsigned short m_deviceid; 419 char m_algorithmformat; 420 unsigned int m_flags; 421 }; 422 423 /* Flags used by erofs_map_blocks_flatmode() */ 424 #define EROFS_GET_BLOCKS_RAW 0x0001 425 /* 426 * Used to get the exact decompressed length, e.g. fiemap (consider lookback 427 * approach instead if possible since it's more metadata lightweight.) 428 */ 429 #define EROFS_GET_BLOCKS_FIEMAP 0x0002 430 /* Used to map the whole extent if non-negligible data is requested for LZMA */ 431 #define EROFS_GET_BLOCKS_READMORE 0x0004 432 /* Used to map tail extent for tailpacking inline or fragment pcluster */ 433 #define EROFS_GET_BLOCKS_FINDTAIL 0x0008 434 435 enum { 436 Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX, 437 Z_EROFS_COMPRESSION_INTERLACED, 438 Z_EROFS_COMPRESSION_RUNTIME_MAX 439 }; 440 441 /* zmap.c */ 442 extern const struct iomap_ops z_erofs_iomap_report_ops; 443 444 #ifdef CONFIG_EROFS_FS_ZIP 445 int z_erofs_fill_inode(struct inode *inode); 446 int z_erofs_map_blocks_iter(struct inode *inode, 447 struct erofs_map_blocks *map, 448 int flags); 449 #else 450 static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; } 451 static inline int z_erofs_map_blocks_iter(struct inode *inode, 452 struct erofs_map_blocks *map, 453 int flags) 454 { 455 return -EOPNOTSUPP; 456 } 457 #endif /* !CONFIG_EROFS_FS_ZIP */ 458 459 struct erofs_map_dev { 460 struct erofs_fscache *m_fscache; 461 struct block_device *m_bdev; 462 struct dax_device *m_daxdev; 463 u64 m_dax_part_off; 464 465 erofs_off_t m_pa; 466 unsigned int m_deviceid; 467 }; 468 469 /* data.c */ 470 extern const struct file_operations erofs_file_fops; 471 void erofs_unmap_metabuf(struct erofs_buf *buf); 472 void erofs_put_metabuf(struct erofs_buf *buf); 473 void *erofs_bread(struct erofs_buf *buf, struct inode *inode, 474 erofs_blk_t blkaddr, enum erofs_kmap_type type); 475 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb, 476 erofs_blk_t blkaddr, enum erofs_kmap_type type); 477 int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev); 478 int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 479 u64 start, u64 len); 480 int erofs_map_blocks(struct inode *inode, 481 struct erofs_map_blocks *map, int flags); 482 483 /* inode.c */ 484 static inline unsigned long erofs_inode_hash(erofs_nid_t nid) 485 { 486 #if BITS_PER_LONG == 32 487 return (nid >> 32) ^ (nid & 0xffffffff); 488 #else 489 return nid; 490 #endif 491 } 492 493 extern const struct inode_operations erofs_generic_iops; 494 extern const struct inode_operations erofs_symlink_iops; 495 extern const struct inode_operations erofs_fast_symlink_iops; 496 497 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid); 498 int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path, 499 struct kstat *stat, u32 request_mask, 500 unsigned int query_flags); 501 502 /* namei.c */ 503 extern const struct inode_operations erofs_dir_iops; 504 505 int erofs_namei(struct inode *dir, const struct qstr *name, 506 erofs_nid_t *nid, unsigned int *d_type); 507 508 /* dir.c */ 509 extern const struct file_operations erofs_dir_fops; 510 511 static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count) 512 { 513 int retried = 0; 514 515 while (1) { 516 void *p = vm_map_ram(pages, count, -1); 517 518 /* retry two more times (totally 3 times) */ 519 if (p || ++retried >= 3) 520 return p; 521 vm_unmap_aliases(); 522 } 523 return NULL; 524 } 525 526 /* pcpubuf.c */ 527 void *erofs_get_pcpubuf(unsigned int requiredpages); 528 void erofs_put_pcpubuf(void *ptr); 529 int erofs_pcpubuf_growsize(unsigned int nrpages); 530 void erofs_pcpubuf_init(void); 531 void erofs_pcpubuf_exit(void); 532 533 /* sysfs.c */ 534 int erofs_register_sysfs(struct super_block *sb); 535 void erofs_unregister_sysfs(struct super_block *sb); 536 int __init erofs_init_sysfs(void); 537 void erofs_exit_sysfs(void); 538 539 /* utils.c / zdata.c */ 540 struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp); 541 static inline void erofs_pagepool_add(struct page **pagepool, 542 struct page *page) 543 { 544 set_page_private(page, (unsigned long)*pagepool); 545 *pagepool = page; 546 } 547 void erofs_release_pages(struct page **pagepool); 548 549 #ifdef CONFIG_EROFS_FS_ZIP 550 int erofs_workgroup_put(struct erofs_workgroup *grp); 551 struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, 552 pgoff_t index); 553 struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb, 554 struct erofs_workgroup *grp); 555 void erofs_workgroup_free_rcu(struct erofs_workgroup *grp); 556 void erofs_shrinker_register(struct super_block *sb); 557 void erofs_shrinker_unregister(struct super_block *sb); 558 int __init erofs_init_shrinker(void); 559 void erofs_exit_shrinker(void); 560 int __init z_erofs_init_zip_subsystem(void); 561 void z_erofs_exit_zip_subsystem(void); 562 int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 563 struct erofs_workgroup *egrp); 564 int erofs_try_to_free_cached_page(struct page *page); 565 int z_erofs_load_lz4_config(struct super_block *sb, 566 struct erofs_super_block *dsb, 567 struct z_erofs_lz4_cfgs *lz4, int len); 568 #else 569 static inline void erofs_shrinker_register(struct super_block *sb) {} 570 static inline void erofs_shrinker_unregister(struct super_block *sb) {} 571 static inline int erofs_init_shrinker(void) { return 0; } 572 static inline void erofs_exit_shrinker(void) {} 573 static inline int z_erofs_init_zip_subsystem(void) { return 0; } 574 static inline void z_erofs_exit_zip_subsystem(void) {} 575 static inline int z_erofs_load_lz4_config(struct super_block *sb, 576 struct erofs_super_block *dsb, 577 struct z_erofs_lz4_cfgs *lz4, int len) 578 { 579 if (lz4 || dsb->u1.lz4_max_distance) { 580 erofs_err(sb, "lz4 algorithm isn't enabled"); 581 return -EINVAL; 582 } 583 return 0; 584 } 585 #endif /* !CONFIG_EROFS_FS_ZIP */ 586 587 #ifdef CONFIG_EROFS_FS_ZIP_LZMA 588 int z_erofs_lzma_init(void); 589 void z_erofs_lzma_exit(void); 590 int z_erofs_load_lzma_config(struct super_block *sb, 591 struct erofs_super_block *dsb, 592 struct z_erofs_lzma_cfgs *lzma, int size); 593 #else 594 static inline int z_erofs_lzma_init(void) { return 0; } 595 static inline int z_erofs_lzma_exit(void) { return 0; } 596 static inline int z_erofs_load_lzma_config(struct super_block *sb, 597 struct erofs_super_block *dsb, 598 struct z_erofs_lzma_cfgs *lzma, int size) { 599 if (lzma) { 600 erofs_err(sb, "lzma algorithm isn't enabled"); 601 return -EINVAL; 602 } 603 return 0; 604 } 605 #endif /* !CONFIG_EROFS_FS_ZIP */ 606 607 /* fscache.c */ 608 #ifdef CONFIG_EROFS_FS_ONDEMAND 609 int erofs_fscache_register_fs(struct super_block *sb); 610 void erofs_fscache_unregister_fs(struct super_block *sb); 611 612 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, 613 char *name, bool need_inode); 614 void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache); 615 616 extern const struct address_space_operations erofs_fscache_access_aops; 617 #else 618 static inline int erofs_fscache_register_fs(struct super_block *sb) 619 { 620 return -EOPNOTSUPP; 621 } 622 static inline void erofs_fscache_unregister_fs(struct super_block *sb) {} 623 624 static inline 625 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, 626 char *name, bool need_inode) 627 { 628 return ERR_PTR(-EOPNOTSUPP); 629 } 630 631 static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache) 632 { 633 } 634 #endif 635 636 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 637 638 #endif /* __EROFS_INTERNAL_H */ 639