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 unsigned char islotbits; /* inode slot unit size in bit shift */
149 unsigned char blkszbits; /* filesystem block size in bit shift */
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 erofs_nid_t packed_nid;
158 /* used for statfs, f_files - f_favail */
159 u64 inos;
160
161 u8 uuid[16]; /* 128-bit uuid for volume */
162 u8 volume_name[16]; /* volume name */
163 u32 feature_compat;
164 u32 feature_incompat;
165
166 /* sysfs support */
167 struct kobject s_kobj; /* /sys/fs/erofs/<devname> */
168 struct completion s_kobj_unregister;
169
170 /* fscache support */
171 struct fscache_volume *volume;
172 struct erofs_fscache *s_fscache;
173 struct erofs_domain *domain;
174 char *fsid;
175 char *domain_id;
176 };
177
178 #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
179 #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info)
180
181 /* Mount flags set via mount options or defaults */
182 #define EROFS_MOUNT_XATTR_USER 0x00000010
183 #define EROFS_MOUNT_POSIX_ACL 0x00000020
184 #define EROFS_MOUNT_DAX_ALWAYS 0x00000040
185 #define EROFS_MOUNT_DAX_NEVER 0x00000080
186
187 #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option)
188 #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option)
189 #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option)
190
erofs_is_fscache_mode(struct super_block * sb)191 static inline bool erofs_is_fscache_mode(struct super_block *sb)
192 {
193 return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !sb->s_bdev;
194 }
195
196 enum {
197 EROFS_ZIP_CACHE_DISABLED,
198 EROFS_ZIP_CACHE_READAHEAD,
199 EROFS_ZIP_CACHE_READAROUND
200 };
201
202 #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL)
203
204 /* basic unit of the workstation of a super_block */
205 struct erofs_workgroup {
206 /* the workgroup index in the workstation */
207 pgoff_t index;
208
209 /* overall workgroup reference count */
210 atomic_t refcount;
211 spinlock_t lock;
212 };
213
erofs_workgroup_try_to_freeze(struct erofs_workgroup * grp,int val)214 static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp,
215 int val)
216 {
217 preempt_disable();
218 if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) {
219 preempt_enable();
220 return false;
221 }
222 return true;
223 }
224
erofs_workgroup_unfreeze(struct erofs_workgroup * grp,int orig_val)225 static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp,
226 int orig_val)
227 {
228 /*
229 * other observers should notice all modifications
230 * in the freezing period.
231 */
232 smp_mb();
233 atomic_set(&grp->refcount, orig_val);
234 preempt_enable();
235 }
236
erofs_wait_on_workgroup_freezed(struct erofs_workgroup * grp)237 static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp)
238 {
239 return atomic_cond_read_relaxed(&grp->refcount,
240 VAL != EROFS_LOCKED_MAGIC);
241 }
242
243 enum erofs_kmap_type {
244 EROFS_NO_KMAP, /* don't map the buffer */
245 EROFS_KMAP, /* use kmap() to map the buffer */
246 EROFS_KMAP_ATOMIC, /* use kmap_atomic() to map the buffer */
247 };
248
249 struct erofs_buf {
250 struct page *page;
251 void *base;
252 enum erofs_kmap_type kmap_type;
253 };
254 #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL })
255
256 #define ROOT_NID(sb) ((sb)->root_nid)
257
258 #define erofs_blknr(sb, addr) ((addr) >> (sb)->s_blocksize_bits)
259 #define erofs_blkoff(sb, addr) ((addr) & ((sb)->s_blocksize - 1))
260 #define erofs_pos(sb, blk) ((erofs_off_t)(blk) << (sb)->s_blocksize_bits)
261 #define erofs_iblks(i) (round_up((i)->i_size, i_blocksize(i)) >> (i)->i_blkbits)
262
263 #define EROFS_FEATURE_FUNCS(name, compat, feature) \
264 static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \
265 { \
266 return sbi->feature_##compat & EROFS_FEATURE_##feature; \
267 }
268
269 EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING)
270 EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
271 EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
272 EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE)
273 EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)
274 EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2)
275 EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING)
276 EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS)
277 EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
278 EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
279
280 /* atomic flag definitions */
281 #define EROFS_I_EA_INITED_BIT 0
282 #define EROFS_I_Z_INITED_BIT 1
283
284 /* bitlock definitions (arranged in reverse order) */
285 #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1)
286 #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2)
287
288 struct erofs_inode {
289 erofs_nid_t nid;
290
291 /* atomic flags (including bitlocks) */
292 unsigned long flags;
293
294 unsigned char datalayout;
295 unsigned char inode_isize;
296 unsigned int xattr_isize;
297
298 unsigned int xattr_shared_count;
299 unsigned int *xattr_shared_xattrs;
300
301 union {
302 erofs_blk_t raw_blkaddr;
303 struct {
304 unsigned short chunkformat;
305 unsigned char chunkbits;
306 };
307 #ifdef CONFIG_EROFS_FS_ZIP
308 struct {
309 unsigned short z_advise;
310 unsigned char z_algorithmtype[2];
311 unsigned char z_logical_clusterbits;
312 unsigned long z_tailextent_headlcn;
313 union {
314 struct {
315 erofs_off_t z_idataoff;
316 unsigned short z_idata_size;
317 };
318 erofs_off_t z_fragmentoff;
319 };
320 };
321 #endif /* CONFIG_EROFS_FS_ZIP */
322 };
323 /* the corresponding vfs inode */
324 struct inode vfs_inode;
325 };
326
327 #define EROFS_I(ptr) container_of(ptr, struct erofs_inode, vfs_inode)
328
erofs_iloc(struct inode * inode)329 static inline erofs_off_t erofs_iloc(struct inode *inode)
330 {
331 struct erofs_sb_info *sbi = EROFS_I_SB(inode);
332
333 return erofs_pos(inode->i_sb, sbi->meta_blkaddr) +
334 (EROFS_I(inode)->nid << sbi->islotbits);
335 }
336
erofs_bitrange(unsigned int value,unsigned int bit,unsigned int bits)337 static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit,
338 unsigned int bits)
339 {
340
341 return (value >> bit) & ((1 << bits) - 1);
342 }
343
344
erofs_inode_version(unsigned int value)345 static inline unsigned int erofs_inode_version(unsigned int value)
346 {
347 return erofs_bitrange(value, EROFS_I_VERSION_BIT,
348 EROFS_I_VERSION_BITS);
349 }
350
erofs_inode_datalayout(unsigned int value)351 static inline unsigned int erofs_inode_datalayout(unsigned int value)
352 {
353 return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT,
354 EROFS_I_DATALAYOUT_BITS);
355 }
356
357 /*
358 * Different from grab_cache_page_nowait(), reclaiming is never triggered
359 * when allocating new pages.
360 */
361 static inline
erofs_grab_cache_page_nowait(struct address_space * mapping,pgoff_t index)362 struct page *erofs_grab_cache_page_nowait(struct address_space *mapping,
363 pgoff_t index)
364 {
365 return pagecache_get_page(mapping, index,
366 FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT,
367 readahead_gfp_mask(mapping) & ~__GFP_RECLAIM);
368 }
369
370 extern const struct super_operations erofs_sops;
371 extern struct file_system_type erofs_fs_type;
372
373 extern const struct address_space_operations erofs_raw_access_aops;
374 extern const struct address_space_operations z_erofs_aops;
375
376 enum {
377 BH_Encoded = BH_PrivateStart,
378 BH_FullMapped,
379 BH_Fragment,
380 BH_Partialref,
381 };
382
383 /* Has a disk mapping */
384 #define EROFS_MAP_MAPPED (1 << BH_Mapped)
385 /* Located in metadata (could be copied from bd_inode) */
386 #define EROFS_MAP_META (1 << BH_Meta)
387 /* The extent is encoded */
388 #define EROFS_MAP_ENCODED (1 << BH_Encoded)
389 /* The length of extent is full */
390 #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped)
391 /* Located in the special packed inode */
392 #define EROFS_MAP_FRAGMENT (1 << BH_Fragment)
393 /* The extent refers to partial decompressed data */
394 #define EROFS_MAP_PARTIAL_REF (1 << BH_Partialref)
395
396 struct erofs_map_blocks {
397 struct erofs_buf buf;
398
399 erofs_off_t m_pa, m_la;
400 u64 m_plen, m_llen;
401
402 unsigned short m_deviceid;
403 char m_algorithmformat;
404 unsigned int m_flags;
405 };
406
407 /* Flags used by erofs_map_blocks_flatmode() */
408 #define EROFS_GET_BLOCKS_RAW 0x0001
409 /*
410 * Used to get the exact decompressed length, e.g. fiemap (consider lookback
411 * approach instead if possible since it's more metadata lightweight.)
412 */
413 #define EROFS_GET_BLOCKS_FIEMAP 0x0002
414 /* Used to map the whole extent if non-negligible data is requested for LZMA */
415 #define EROFS_GET_BLOCKS_READMORE 0x0004
416 /* Used to map tail extent for tailpacking inline or fragment pcluster */
417 #define EROFS_GET_BLOCKS_FINDTAIL 0x0008
418
419 enum {
420 Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX,
421 Z_EROFS_COMPRESSION_INTERLACED,
422 Z_EROFS_COMPRESSION_RUNTIME_MAX
423 };
424
425 /* zmap.c */
426 extern const struct iomap_ops z_erofs_iomap_report_ops;
427
428 #ifdef CONFIG_EROFS_FS_ZIP
429 int z_erofs_fill_inode(struct inode *inode);
430 int z_erofs_map_blocks_iter(struct inode *inode,
431 struct erofs_map_blocks *map,
432 int flags);
433 #else
z_erofs_fill_inode(struct inode * inode)434 static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; }
z_erofs_map_blocks_iter(struct inode * inode,struct erofs_map_blocks * map,int flags)435 static inline int z_erofs_map_blocks_iter(struct inode *inode,
436 struct erofs_map_blocks *map,
437 int flags)
438 {
439 return -EOPNOTSUPP;
440 }
441 #endif /* !CONFIG_EROFS_FS_ZIP */
442
443 struct erofs_map_dev {
444 struct erofs_fscache *m_fscache;
445 struct block_device *m_bdev;
446 struct dax_device *m_daxdev;
447 u64 m_dax_part_off;
448
449 erofs_off_t m_pa;
450 unsigned int m_deviceid;
451 };
452
453 /* data.c */
454 extern const struct file_operations erofs_file_fops;
455 void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
456 erofs_off_t *offset, int *lengthp);
457 void erofs_unmap_metabuf(struct erofs_buf *buf);
458 void erofs_put_metabuf(struct erofs_buf *buf);
459 void *erofs_bread(struct erofs_buf *buf, struct inode *inode,
460 erofs_blk_t blkaddr, enum erofs_kmap_type type);
461 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
462 erofs_blk_t blkaddr, enum erofs_kmap_type type);
463 int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev);
464 int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
465 u64 start, u64 len);
466 int erofs_map_blocks(struct inode *inode,
467 struct erofs_map_blocks *map, int flags);
468
469 /* inode.c */
erofs_inode_hash(erofs_nid_t nid)470 static inline unsigned long erofs_inode_hash(erofs_nid_t nid)
471 {
472 #if BITS_PER_LONG == 32
473 return (nid >> 32) ^ (nid & 0xffffffff);
474 #else
475 return nid;
476 #endif
477 }
478
479 extern const struct inode_operations erofs_generic_iops;
480 extern const struct inode_operations erofs_symlink_iops;
481 extern const struct inode_operations erofs_fast_symlink_iops;
482
483 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid);
484 int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path,
485 struct kstat *stat, u32 request_mask,
486 unsigned int query_flags);
487
488 /* namei.c */
489 extern const struct inode_operations erofs_dir_iops;
490
491 int erofs_namei(struct inode *dir, const struct qstr *name,
492 erofs_nid_t *nid, unsigned int *d_type);
493
494 /* dir.c */
495 extern const struct file_operations erofs_dir_fops;
496
erofs_vm_map_ram(struct page ** pages,unsigned int count)497 static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count)
498 {
499 int retried = 0;
500
501 while (1) {
502 void *p = vm_map_ram(pages, count, -1);
503
504 /* retry two more times (totally 3 times) */
505 if (p || ++retried >= 3)
506 return p;
507 vm_unmap_aliases();
508 }
509 return NULL;
510 }
511
512 /* pcpubuf.c */
513 void *erofs_get_pcpubuf(unsigned int requiredpages);
514 void erofs_put_pcpubuf(void *ptr);
515 int erofs_pcpubuf_growsize(unsigned int nrpages);
516 void erofs_pcpubuf_init(void);
517 void erofs_pcpubuf_exit(void);
518
519 /* sysfs.c */
520 int erofs_register_sysfs(struct super_block *sb);
521 void erofs_unregister_sysfs(struct super_block *sb);
522 int __init erofs_init_sysfs(void);
523 void erofs_exit_sysfs(void);
524
525 /* utils.c / zdata.c */
526 struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp);
erofs_pagepool_add(struct page ** pagepool,struct page * page)527 static inline void erofs_pagepool_add(struct page **pagepool,
528 struct page *page)
529 {
530 set_page_private(page, (unsigned long)*pagepool);
531 *pagepool = page;
532 }
533 void erofs_release_pages(struct page **pagepool);
534
535 #ifdef CONFIG_EROFS_FS_ZIP
536 int erofs_workgroup_put(struct erofs_workgroup *grp);
537 struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
538 pgoff_t index);
539 struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb,
540 struct erofs_workgroup *grp);
541 void erofs_workgroup_free_rcu(struct erofs_workgroup *grp);
542 void erofs_shrinker_register(struct super_block *sb);
543 void erofs_shrinker_unregister(struct super_block *sb);
544 int __init erofs_init_shrinker(void);
545 void erofs_exit_shrinker(void);
546 int __init z_erofs_init_zip_subsystem(void);
547 void z_erofs_exit_zip_subsystem(void);
548 int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
549 struct erofs_workgroup *egrp);
550 int erofs_init_managed_cache(struct super_block *sb);
551 int erofs_try_to_free_cached_page(struct page *page);
552 int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb);
553 #else
erofs_shrinker_register(struct super_block * sb)554 static inline void erofs_shrinker_register(struct super_block *sb) {}
erofs_shrinker_unregister(struct super_block * sb)555 static inline void erofs_shrinker_unregister(struct super_block *sb) {}
erofs_init_shrinker(void)556 static inline int erofs_init_shrinker(void) { return 0; }
erofs_exit_shrinker(void)557 static inline void erofs_exit_shrinker(void) {}
z_erofs_init_zip_subsystem(void)558 static inline int z_erofs_init_zip_subsystem(void) { return 0; }
z_erofs_exit_zip_subsystem(void)559 static inline void z_erofs_exit_zip_subsystem(void) {}
erofs_init_managed_cache(struct super_block * sb)560 static inline int erofs_init_managed_cache(struct super_block *sb) { return 0; }
561 #endif /* !CONFIG_EROFS_FS_ZIP */
562
563 #ifdef CONFIG_EROFS_FS_ZIP_LZMA
564 int z_erofs_lzma_init(void);
565 void z_erofs_lzma_exit(void);
566 #else
z_erofs_lzma_init(void)567 static inline int z_erofs_lzma_init(void) { return 0; }
z_erofs_lzma_exit(void)568 static inline int z_erofs_lzma_exit(void) { return 0; }
569 #endif /* !CONFIG_EROFS_FS_ZIP */
570
571 /* flags for erofs_fscache_register_cookie() */
572 #define EROFS_REG_COOKIE_NEED_INODE 1
573 #define EROFS_REG_COOKIE_NEED_NOEXIST 2
574
575 /* fscache.c */
576 #ifdef CONFIG_EROFS_FS_ONDEMAND
577 int erofs_fscache_register_fs(struct super_block *sb);
578 void erofs_fscache_unregister_fs(struct super_block *sb);
579
580 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
581 char *name,
582 unsigned int flags);
583 void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache);
584
585 extern const struct address_space_operations erofs_fscache_access_aops;
586 #else
erofs_fscache_register_fs(struct super_block * sb)587 static inline int erofs_fscache_register_fs(struct super_block *sb)
588 {
589 return -EOPNOTSUPP;
590 }
erofs_fscache_unregister_fs(struct super_block * sb)591 static inline void erofs_fscache_unregister_fs(struct super_block *sb) {}
592
593 static inline
erofs_fscache_register_cookie(struct super_block * sb,char * name,unsigned int flags)594 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
595 char *name,
596 unsigned int flags)
597 {
598 return ERR_PTR(-EOPNOTSUPP);
599 }
600
erofs_fscache_unregister_cookie(struct erofs_fscache * fscache)601 static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache)
602 {
603 }
604 #endif
605
606 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
607
608 #endif /* __EROFS_INTERNAL_H */
609