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/dax.h>
12 #include <linux/dcache.h>
13 #include <linux/mm.h>
14 #include <linux/module.h>
15 #include <linux/pagemap.h>
16 #include <linux/bio.h>
17 #include <linux/magic.h>
18 #include <linux/slab.h>
19 #include <linux/vmalloc.h>
20 #include <linux/iomap.h>
21 #include "erofs_fs.h"
22
23 __printf(2, 3) void _erofs_printk(struct super_block *sb, const char *fmt, ...);
24 #define erofs_err(sb, fmt, ...) \
25 _erofs_printk(sb, KERN_ERR fmt "\n", ##__VA_ARGS__)
26 #define erofs_info(sb, fmt, ...) \
27 _erofs_printk(sb, KERN_INFO fmt "\n", ##__VA_ARGS__)
28
29 #ifdef CONFIG_EROFS_FS_DEBUG
30 #define DBG_BUGON BUG_ON
31 #else
32 #define DBG_BUGON(x) ((void)(x))
33 #endif /* !CONFIG_EROFS_FS_DEBUG */
34
35 /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */
36 #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1
37
38 typedef u64 erofs_nid_t;
39 typedef u64 erofs_off_t;
40 typedef u64 erofs_blk_t;
41
42 struct erofs_device_info {
43 char *path;
44 struct erofs_fscache *fscache;
45 struct file *file;
46 struct dax_device *dax_dev;
47 u64 fsoff, dax_part_off;
48
49 erofs_blk_t blocks;
50 erofs_blk_t uniaddr;
51 };
52
53 enum {
54 EROFS_SYNC_DECOMPRESS_AUTO,
55 EROFS_SYNC_DECOMPRESS_FORCE_ON,
56 EROFS_SYNC_DECOMPRESS_FORCE_OFF
57 };
58
59 struct erofs_mount_opts {
60 /* current strategy of how to use managed cache */
61 unsigned char cache_strategy;
62 /* strategy of sync decompression (0 - auto, 1 - force on, 2 - force off) */
63 unsigned int sync_decompress;
64 /* threshold for decompression synchronously */
65 unsigned int max_sync_decompress_pages;
66 unsigned int mount_opt;
67 };
68
69 struct erofs_dev_context {
70 struct idr tree;
71 struct rw_semaphore rwsem;
72
73 unsigned int extra_devices;
74 bool flatdev;
75 };
76
77 /* all filesystem-wide lz4 configurations */
78 struct erofs_sb_lz4_info {
79 /* # of pages needed for EROFS lz4 rolling decompression */
80 u16 max_distance_pages;
81 /* maximum possible blocks for pclusters in the filesystem */
82 u16 max_pclusterblks;
83 };
84
85 struct erofs_domain {
86 refcount_t ref;
87 struct list_head list;
88 struct fscache_volume *volume;
89 char *domain_id;
90 };
91
92 struct erofs_fscache {
93 struct fscache_cookie *cookie;
94 struct inode *inode; /* anonymous inode for the blob */
95
96 /* used for share domain mode */
97 struct erofs_domain *domain;
98 struct list_head node;
99 refcount_t ref;
100 char *name;
101 };
102
103 struct erofs_xattr_prefix_item {
104 struct erofs_xattr_long_prefix *prefix;
105 u8 infix_len;
106 };
107
108 struct erofs_sb_info {
109 struct erofs_device_info dif0;
110 struct erofs_mount_opts opt; /* options */
111 #ifdef CONFIG_EROFS_FS_ZIP
112 /* list for all registered superblocks, mainly for shrinker */
113 struct list_head list;
114 struct mutex umount_mutex;
115
116 /* managed XArray arranged in physical block number */
117 struct xarray managed_pslots;
118
119 unsigned int shrinker_run_no;
120 u16 available_compr_algs;
121
122 /* pseudo inode to manage cached pages */
123 struct inode *managed_cache;
124
125 struct erofs_sb_lz4_info lz4;
126 #endif /* CONFIG_EROFS_FS_ZIP */
127 struct inode *packed_inode;
128 struct inode *metabox_inode;
129 struct erofs_dev_context *devs;
130 u64 total_blocks;
131
132 u32 meta_blkaddr;
133 #ifdef CONFIG_EROFS_FS_XATTR
134 u32 xattr_blkaddr;
135 u32 xattr_prefix_start;
136 u8 xattr_prefix_count;
137 struct erofs_xattr_prefix_item *xattr_prefixes;
138 unsigned int xattr_filter_reserved;
139 #endif
140 u16 device_id_mask; /* valid bits of device id to be used */
141
142 unsigned char islotbits; /* inode slot unit size in bit shift */
143 unsigned char blkszbits; /* filesystem block size in bit shift */
144
145 u32 sb_size; /* total superblock size */
146 u32 fixed_nsec;
147 s64 epoch;
148
149 /* what we really care is nid, rather than ino.. */
150 erofs_nid_t root_nid;
151 erofs_nid_t packed_nid;
152 erofs_nid_t metabox_nid;
153 /* used for statfs, f_files - f_favail */
154 u64 inos;
155
156 u32 feature_compat;
157 u32 feature_incompat;
158
159 /* sysfs support */
160 struct kobject s_kobj; /* /sys/fs/erofs/<devname> */
161 struct completion s_kobj_unregister;
162 erofs_off_t dir_ra_bytes;
163
164 /* fscache support */
165 struct fscache_volume *volume;
166 struct erofs_domain *domain;
167 char *fsid;
168 char *domain_id;
169 };
170
171 #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
172 #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info)
173
174 /* Mount flags set via mount options or defaults */
175 #define EROFS_MOUNT_XATTR_USER 0x00000010
176 #define EROFS_MOUNT_POSIX_ACL 0x00000020
177 #define EROFS_MOUNT_DAX_ALWAYS 0x00000040
178 #define EROFS_MOUNT_DAX_NEVER 0x00000080
179 #define EROFS_MOUNT_DIRECT_IO 0x00000100
180
181 #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option)
182 #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option)
183 #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option)
184
erofs_is_fileio_mode(struct erofs_sb_info * sbi)185 static inline bool erofs_is_fileio_mode(struct erofs_sb_info *sbi)
186 {
187 return IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) && sbi->dif0.file;
188 }
189
erofs_is_fscache_mode(struct super_block * sb)190 static inline bool erofs_is_fscache_mode(struct super_block *sb)
191 {
192 return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) &&
193 !erofs_is_fileio_mode(EROFS_SB(sb)) && !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 struct erofs_buf {
203 struct address_space *mapping;
204 struct file *file;
205 u64 off;
206 struct page *page;
207 void *base;
208 };
209 #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL })
210
211 #define erofs_blknr(sb, pos) ((erofs_blk_t)((pos) >> (sb)->s_blocksize_bits))
212 #define erofs_blkoff(sb, pos) ((pos) & ((sb)->s_blocksize - 1))
213 #define erofs_pos(sb, blk) ((erofs_off_t)(blk) << (sb)->s_blocksize_bits)
214 #define erofs_iblks(i) (round_up((i)->i_size, i_blocksize(i)) >> (i)->i_blkbits)
215
216 #define EROFS_FEATURE_FUNCS(name, compat, feature) \
217 static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \
218 { \
219 return sbi->feature_##compat & EROFS_FEATURE_##feature; \
220 }
221
EROFS_FEATURE_FUNCS(zero_padding,incompat,INCOMPAT_ZERO_PADDING)222 EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING)
223 EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
224 EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
225 EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE)
226 EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)
227 EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2)
228 EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING)
229 EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS)
230 EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
231 EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES)
232 EROFS_FEATURE_FUNCS(48bit, incompat, INCOMPAT_48BIT)
233 EROFS_FEATURE_FUNCS(metabox, incompat, INCOMPAT_METABOX)
234 EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
235 EROFS_FEATURE_FUNCS(xattr_filter, compat, COMPAT_XATTR_FILTER)
236 EROFS_FEATURE_FUNCS(shared_ea_in_metabox, compat, COMPAT_SHARED_EA_IN_METABOX)
237 EROFS_FEATURE_FUNCS(plain_xattr_pfx, compat, COMPAT_PLAIN_XATTR_PFX)
238
239 static inline u64 erofs_nid_to_ino64(struct erofs_sb_info *sbi, erofs_nid_t nid)
240 {
241 if (!erofs_sb_has_metabox(sbi))
242 return nid;
243
244 /*
245 * When metadata compression is enabled, avoid generating excessively
246 * large inode numbers for metadata-compressed inodes. Shift NIDs in
247 * the 31-62 bit range left by one and move the metabox flag to bit 31.
248 *
249 * Note: on-disk NIDs remain unchanged as they are primarily used for
250 * compatibility with non-LFS 32-bit applications.
251 */
252 return ((nid << 1) & GENMASK_ULL(63, 32)) | (nid & GENMASK(30, 0)) |
253 ((nid >> EROFS_DIRENT_NID_METABOX_BIT) << 31);
254 }
255
256 /* atomic flag definitions */
257 #define EROFS_I_EA_INITED_BIT 0
258 #define EROFS_I_Z_INITED_BIT 1
259
260 /* bitlock definitions (arranged in reverse order) */
261 #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1)
262 #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2)
263
264 /* default readahead size of directories */
265 #define EROFS_DIR_RA_BYTES 16384
266
267 struct erofs_inode {
268 erofs_nid_t nid;
269
270 /* atomic flags (including bitlocks) */
271 unsigned long flags;
272
273 unsigned char datalayout;
274 unsigned char inode_isize;
275 bool dot_omitted;
276 unsigned int xattr_isize;
277
278 unsigned int xattr_name_filter;
279 unsigned int xattr_shared_count;
280 unsigned int *xattr_shared_xattrs;
281
282 union {
283 erofs_blk_t startblk;
284 struct {
285 unsigned short chunkformat;
286 unsigned char chunkbits;
287 };
288 #ifdef CONFIG_EROFS_FS_ZIP
289 struct {
290 unsigned short z_advise;
291 unsigned char z_algorithmtype[2];
292 unsigned char z_lclusterbits;
293 union {
294 u64 z_tailextent_headlcn;
295 u64 z_extents;
296 };
297 erofs_off_t z_fragmentoff;
298 unsigned short z_idata_size;
299 };
300 #endif /* CONFIG_EROFS_FS_ZIP */
301 };
302 /* the corresponding vfs inode */
303 struct inode vfs_inode;
304 };
305
306 #define EROFS_I(ptr) container_of(ptr, struct erofs_inode, vfs_inode)
307
erofs_inode_in_metabox(struct inode * inode)308 static inline bool erofs_inode_in_metabox(struct inode *inode)
309 {
310 return EROFS_I(inode)->nid & BIT_ULL(EROFS_DIRENT_NID_METABOX_BIT);
311 }
312
erofs_iloc(struct inode * inode)313 static inline erofs_off_t erofs_iloc(struct inode *inode)
314 {
315 struct erofs_sb_info *sbi = EROFS_I_SB(inode);
316 erofs_nid_t nid_lo = EROFS_I(inode)->nid & EROFS_DIRENT_NID_MASK;
317
318 if (erofs_inode_in_metabox(inode))
319 return nid_lo << sbi->islotbits;
320 return erofs_pos(inode->i_sb, sbi->meta_blkaddr) +
321 (nid_lo << sbi->islotbits);
322 }
323
erofs_inode_version(unsigned int ifmt)324 static inline unsigned int erofs_inode_version(unsigned int ifmt)
325 {
326 return (ifmt >> EROFS_I_VERSION_BIT) & EROFS_I_VERSION_MASK;
327 }
328
erofs_inode_datalayout(unsigned int ifmt)329 static inline unsigned int erofs_inode_datalayout(unsigned int ifmt)
330 {
331 return (ifmt >> EROFS_I_DATALAYOUT_BIT) & EROFS_I_DATALAYOUT_MASK;
332 }
333
334 /* reclaiming is never triggered when allocating new folios. */
erofs_grab_folio_nowait(struct address_space * as,pgoff_t index)335 static inline struct folio *erofs_grab_folio_nowait(struct address_space *as,
336 pgoff_t index)
337 {
338 return __filemap_get_folio(as, index,
339 FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT,
340 readahead_gfp_mask(as) & ~__GFP_RECLAIM);
341 }
342
343 /* Has a disk mapping */
344 #define EROFS_MAP_MAPPED 0x0001
345 /* Located in metadata (could be copied from bd_inode) */
346 #define EROFS_MAP_META 0x0002
347 /* The extent is encoded */
348 #define EROFS_MAP_ENCODED 0x0004
349 /* The length of extent is full */
350 #define EROFS_MAP_FULL_MAPPED 0x0008
351 /* Located in the special packed inode */
352 #define __EROFS_MAP_FRAGMENT 0x0010
353 /* The extent refers to partial decompressed data */
354 #define EROFS_MAP_PARTIAL_REF 0x0020
355
356 #define EROFS_MAP_FRAGMENT (EROFS_MAP_MAPPED | __EROFS_MAP_FRAGMENT)
357
358 struct erofs_map_blocks {
359 struct erofs_buf buf;
360
361 erofs_off_t m_pa, m_la;
362 u64 m_plen, m_llen;
363
364 unsigned short m_deviceid;
365 char m_algorithmformat;
366 unsigned int m_flags;
367 };
368
369 /*
370 * Used to get the exact decompressed length, e.g. fiemap (consider lookback
371 * approach instead if possible since it's more metadata lightweight.)
372 */
373 #define EROFS_GET_BLOCKS_FIEMAP 0x0001
374 /* Used to map the whole extent if non-negligible data is requested for LZMA */
375 #define EROFS_GET_BLOCKS_READMORE 0x0002
376 /* Used to map tail extent for tailpacking inline or fragment pcluster */
377 #define EROFS_GET_BLOCKS_FINDTAIL 0x0004
378
379 enum {
380 Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX,
381 Z_EROFS_COMPRESSION_INTERLACED,
382 Z_EROFS_COMPRESSION_RUNTIME_MAX
383 };
384
385 struct erofs_map_dev {
386 struct super_block *m_sb;
387 struct erofs_device_info *m_dif;
388 struct block_device *m_bdev;
389
390 erofs_off_t m_pa;
391 unsigned int m_deviceid;
392 };
393
394 extern const struct super_operations erofs_sops;
395
396 extern const struct address_space_operations erofs_aops;
397 extern const struct address_space_operations erofs_fileio_aops;
398 extern const struct address_space_operations z_erofs_aops;
399 extern const struct address_space_operations erofs_fscache_access_aops;
400
401 extern const struct inode_operations erofs_generic_iops;
402 extern const struct inode_operations erofs_symlink_iops;
403 extern const struct inode_operations erofs_fast_symlink_iops;
404 extern const struct inode_operations erofs_dir_iops;
405
406 extern const struct file_operations erofs_file_fops;
407 extern const struct file_operations erofs_dir_fops;
408
409 extern const struct iomap_ops z_erofs_iomap_report_ops;
410
411 /* flags for erofs_fscache_register_cookie() */
412 #define EROFS_REG_COOKIE_SHARE 0x0001
413 #define EROFS_REG_COOKIE_NEED_NOEXIST 0x0002
414
415 void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
416 erofs_off_t *offset, int *lengthp);
417 void erofs_unmap_metabuf(struct erofs_buf *buf);
418 void erofs_put_metabuf(struct erofs_buf *buf);
419 void *erofs_bread(struct erofs_buf *buf, erofs_off_t offset, bool need_kmap);
420 int erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb,
421 bool in_metabox);
422 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
423 erofs_off_t offset, bool in_metabox);
424 int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev);
425 int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
426 u64 start, u64 len);
427 int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map);
428 void erofs_onlinefolio_init(struct folio *folio);
429 void erofs_onlinefolio_split(struct folio *folio);
430 void erofs_onlinefolio_end(struct folio *folio, int err, bool dirty);
431 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid);
432 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
433 struct kstat *stat, u32 request_mask,
434 unsigned int query_flags);
435 int erofs_namei(struct inode *dir, const struct qstr *name,
436 erofs_nid_t *nid, unsigned int *d_type);
437
erofs_vm_map_ram(struct page ** pages,unsigned int count)438 static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count)
439 {
440 int retried = 0;
441
442 while (1) {
443 void *p = vm_map_ram(pages, count, -1);
444
445 /* retry two more times (totally 3 times) */
446 if (p || ++retried >= 3)
447 return p;
448 vm_unmap_aliases();
449 }
450 return NULL;
451 }
452
453 int erofs_register_sysfs(struct super_block *sb);
454 void erofs_unregister_sysfs(struct super_block *sb);
455 int __init erofs_init_sysfs(void);
456 void erofs_exit_sysfs(void);
457
458 struct page *__erofs_allocpage(struct page **pagepool, gfp_t gfp, bool tryrsv);
erofs_allocpage(struct page ** pagepool,gfp_t gfp)459 static inline struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp)
460 {
461 return __erofs_allocpage(pagepool, gfp, false);
462 }
erofs_pagepool_add(struct page ** pagepool,struct page * page)463 static inline void erofs_pagepool_add(struct page **pagepool, struct page *page)
464 {
465 set_page_private(page, (unsigned long)*pagepool);
466 *pagepool = page;
467 }
468 void erofs_release_pages(struct page **pagepool);
469
470 #ifdef CONFIG_EROFS_FS_ZIP
471 #define MNGD_MAPPING(sbi) ((sbi)->managed_cache->i_mapping)
472
473 extern atomic_long_t erofs_global_shrink_cnt;
474 void erofs_shrinker_register(struct super_block *sb);
475 void erofs_shrinker_unregister(struct super_block *sb);
476 int __init erofs_init_shrinker(void);
477 void erofs_exit_shrinker(void);
478 int __init z_erofs_init_subsystem(void);
479 void z_erofs_exit_subsystem(void);
480 int z_erofs_init_super(struct super_block *sb);
481 unsigned long z_erofs_shrink_scan(struct erofs_sb_info *sbi,
482 unsigned long nr_shrink);
483 int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
484 int flags);
485 void *z_erofs_get_gbuf(unsigned int requiredpages);
486 void z_erofs_put_gbuf(void *ptr);
487 int z_erofs_gbuf_growsize(unsigned int nrpages);
488 int __init z_erofs_gbuf_init(void);
489 void z_erofs_gbuf_exit(void);
490 int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb);
491 #else
erofs_shrinker_register(struct super_block * sb)492 static inline void erofs_shrinker_register(struct super_block *sb) {}
erofs_shrinker_unregister(struct super_block * sb)493 static inline void erofs_shrinker_unregister(struct super_block *sb) {}
erofs_init_shrinker(void)494 static inline int erofs_init_shrinker(void) { return 0; }
erofs_exit_shrinker(void)495 static inline void erofs_exit_shrinker(void) {}
z_erofs_init_subsystem(void)496 static inline int z_erofs_init_subsystem(void) { return 0; }
z_erofs_exit_subsystem(void)497 static inline void z_erofs_exit_subsystem(void) {}
z_erofs_init_super(struct super_block * sb)498 static inline int z_erofs_init_super(struct super_block *sb) { return 0; }
499 #endif /* !CONFIG_EROFS_FS_ZIP */
500
501 #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE
502 struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev);
503 void erofs_fileio_submit_bio(struct bio *bio);
504 #else
erofs_fileio_bio_alloc(struct erofs_map_dev * mdev)505 static inline struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev) { return NULL; }
erofs_fileio_submit_bio(struct bio * bio)506 static inline void erofs_fileio_submit_bio(struct bio *bio) {}
507 #endif
508
509 #ifdef CONFIG_EROFS_FS_ONDEMAND
510 int erofs_fscache_register_fs(struct super_block *sb);
511 void erofs_fscache_unregister_fs(struct super_block *sb);
512
513 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
514 char *name, unsigned int flags);
515 void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache);
516 struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev);
517 void erofs_fscache_submit_bio(struct bio *bio);
518 #else
erofs_fscache_register_fs(struct super_block * sb)519 static inline int erofs_fscache_register_fs(struct super_block *sb)
520 {
521 return -EOPNOTSUPP;
522 }
erofs_fscache_unregister_fs(struct super_block * sb)523 static inline void erofs_fscache_unregister_fs(struct super_block *sb) {}
524
525 static inline
erofs_fscache_register_cookie(struct super_block * sb,char * name,unsigned int flags)526 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
527 char *name, unsigned int flags)
528 {
529 return ERR_PTR(-EOPNOTSUPP);
530 }
531
erofs_fscache_unregister_cookie(struct erofs_fscache * fscache)532 static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache)
533 {
534 }
erofs_fscache_bio_alloc(struct erofs_map_dev * mdev)535 static inline struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev) { return NULL; }
erofs_fscache_submit_bio(struct bio * bio)536 static inline void erofs_fscache_submit_bio(struct bio *bio) {}
537 #endif
538
539 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
540
541 #endif /* __EROFS_INTERNAL_H */
542