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 char *volume_name;
157 u32 feature_compat;
158 u32 feature_incompat;
159
160 /* sysfs support */
161 struct kobject s_kobj; /* /sys/fs/erofs/<devname> */
162 struct completion s_kobj_unregister;
163 erofs_off_t dir_ra_bytes;
164
165 /* fscache support */
166 struct fscache_volume *volume;
167 struct erofs_domain *domain;
168 char *fsid;
169 char *domain_id;
170 };
171
172 #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
173 #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info)
174
175 /* Mount flags set via mount options or defaults */
176 #define EROFS_MOUNT_XATTR_USER 0x00000010
177 #define EROFS_MOUNT_POSIX_ACL 0x00000020
178 #define EROFS_MOUNT_DAX_ALWAYS 0x00000040
179 #define EROFS_MOUNT_DAX_NEVER 0x00000080
180 #define EROFS_MOUNT_DIRECT_IO 0x00000100
181
182 #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option)
183 #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option)
184 #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option)
185
erofs_is_fileio_mode(struct erofs_sb_info * sbi)186 static inline bool erofs_is_fileio_mode(struct erofs_sb_info *sbi)
187 {
188 return IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) && sbi->dif0.file;
189 }
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) &&
194 !erofs_is_fileio_mode(EROFS_SB(sb)) && !sb->s_bdev;
195 }
196
197 enum {
198 EROFS_ZIP_CACHE_DISABLED,
199 EROFS_ZIP_CACHE_READAHEAD,
200 EROFS_ZIP_CACHE_READAROUND
201 };
202
203 struct erofs_buf {
204 struct address_space *mapping;
205 struct file *file;
206 u64 off;
207 struct page *page;
208 void *base;
209 };
210 #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL })
211
212 #define erofs_blknr(sb, pos) ((erofs_blk_t)((pos) >> (sb)->s_blocksize_bits))
213 #define erofs_blkoff(sb, pos) ((pos) & ((sb)->s_blocksize - 1))
214 #define erofs_pos(sb, blk) ((erofs_off_t)(blk) << (sb)->s_blocksize_bits)
215 #define erofs_iblks(i) (round_up((i)->i_size, i_blocksize(i)) >> (i)->i_blkbits)
216
217 #define EROFS_FEATURE_FUNCS(name, compat, feature) \
218 static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \
219 { \
220 return sbi->feature_##compat & EROFS_FEATURE_##feature; \
221 }
222
EROFS_FEATURE_FUNCS(zero_padding,incompat,INCOMPAT_ZERO_PADDING)223 EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING)
224 EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
225 EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
226 EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE)
227 EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)
228 EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2)
229 EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING)
230 EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS)
231 EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
232 EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES)
233 EROFS_FEATURE_FUNCS(48bit, incompat, INCOMPAT_48BIT)
234 EROFS_FEATURE_FUNCS(metabox, incompat, INCOMPAT_METABOX)
235 EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
236 EROFS_FEATURE_FUNCS(xattr_filter, compat, COMPAT_XATTR_FILTER)
237 EROFS_FEATURE_FUNCS(shared_ea_in_metabox, compat, COMPAT_SHARED_EA_IN_METABOX)
238 EROFS_FEATURE_FUNCS(plain_xattr_pfx, compat, COMPAT_PLAIN_XATTR_PFX)
239
240 static inline u64 erofs_nid_to_ino64(struct erofs_sb_info *sbi, erofs_nid_t nid)
241 {
242 if (!erofs_sb_has_metabox(sbi))
243 return nid;
244
245 /*
246 * When metadata compression is enabled, avoid generating excessively
247 * large inode numbers for metadata-compressed inodes. Shift NIDs in
248 * the 31-62 bit range left by one and move the metabox flag to bit 31.
249 *
250 * Note: on-disk NIDs remain unchanged as they are primarily used for
251 * compatibility with non-LFS 32-bit applications.
252 */
253 return ((nid << 1) & GENMASK_ULL(63, 32)) | (nid & GENMASK(30, 0)) |
254 ((nid >> EROFS_DIRENT_NID_METABOX_BIT) << 31);
255 }
256
257 /* atomic flag definitions */
258 #define EROFS_I_EA_INITED_BIT 0
259 #define EROFS_I_Z_INITED_BIT 1
260
261 /* bitlock definitions (arranged in reverse order) */
262 #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1)
263 #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2)
264
265 /* default readahead size of directories */
266 #define EROFS_DIR_RA_BYTES 16384
267
268 struct erofs_inode {
269 erofs_nid_t nid;
270
271 /* atomic flags (including bitlocks) */
272 unsigned long flags;
273
274 unsigned char datalayout;
275 unsigned char inode_isize;
276 bool dot_omitted;
277 unsigned int xattr_isize;
278
279 unsigned int xattr_name_filter;
280 unsigned int xattr_shared_count;
281 unsigned int *xattr_shared_xattrs;
282
283 union {
284 erofs_blk_t startblk;
285 struct {
286 unsigned short chunkformat;
287 unsigned char chunkbits;
288 };
289 #ifdef CONFIG_EROFS_FS_ZIP
290 struct {
291 unsigned short z_advise;
292 unsigned char z_algorithmtype[2];
293 unsigned char z_lclusterbits;
294 union {
295 u64 z_tailextent_headlcn;
296 u64 z_extents;
297 };
298 erofs_off_t z_fragmentoff;
299 unsigned short z_idata_size;
300 };
301 #endif /* CONFIG_EROFS_FS_ZIP */
302 };
303 /* the corresponding vfs inode */
304 struct inode vfs_inode;
305 };
306
307 #define EROFS_I(ptr) container_of(ptr, struct erofs_inode, vfs_inode)
308
erofs_inode_in_metabox(struct inode * inode)309 static inline bool erofs_inode_in_metabox(struct inode *inode)
310 {
311 return EROFS_I(inode)->nid & BIT_ULL(EROFS_DIRENT_NID_METABOX_BIT);
312 }
313
erofs_iloc(struct inode * inode)314 static inline erofs_off_t erofs_iloc(struct inode *inode)
315 {
316 struct erofs_sb_info *sbi = EROFS_I_SB(inode);
317 erofs_nid_t nid_lo = EROFS_I(inode)->nid & EROFS_DIRENT_NID_MASK;
318
319 if (erofs_inode_in_metabox(inode))
320 return nid_lo << sbi->islotbits;
321 return erofs_pos(inode->i_sb, sbi->meta_blkaddr) +
322 (nid_lo << sbi->islotbits);
323 }
324
erofs_inode_version(unsigned int ifmt)325 static inline unsigned int erofs_inode_version(unsigned int ifmt)
326 {
327 return (ifmt >> EROFS_I_VERSION_BIT) & EROFS_I_VERSION_MASK;
328 }
329
erofs_inode_datalayout(unsigned int ifmt)330 static inline unsigned int erofs_inode_datalayout(unsigned int ifmt)
331 {
332 return (ifmt >> EROFS_I_DATALAYOUT_BIT) & EROFS_I_DATALAYOUT_MASK;
333 }
334
335 /* reclaiming is never triggered when allocating new folios. */
erofs_grab_folio_nowait(struct address_space * as,pgoff_t index)336 static inline struct folio *erofs_grab_folio_nowait(struct address_space *as,
337 pgoff_t index)
338 {
339 return __filemap_get_folio(as, index,
340 FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT,
341 readahead_gfp_mask(as) & ~__GFP_RECLAIM);
342 }
343
344 /* Has a disk mapping */
345 #define EROFS_MAP_MAPPED 0x0001
346 /* Located in metadata (could be copied from bd_inode) */
347 #define EROFS_MAP_META 0x0002
348 /* The extent is encoded */
349 #define EROFS_MAP_ENCODED 0x0004
350 /* The length of extent is full */
351 #define EROFS_MAP_FULL_MAPPED 0x0008
352 /* Located in the special packed inode */
353 #define __EROFS_MAP_FRAGMENT 0x0010
354 /* The extent refers to partial decompressed data */
355 #define EROFS_MAP_PARTIAL_REF 0x0020
356
357 #define EROFS_MAP_FRAGMENT (EROFS_MAP_MAPPED | __EROFS_MAP_FRAGMENT)
358
359 struct erofs_map_blocks {
360 struct erofs_buf buf;
361
362 erofs_off_t m_pa, m_la;
363 u64 m_plen, m_llen;
364
365 unsigned short m_deviceid;
366 char m_algorithmformat;
367 unsigned int m_flags;
368 };
369
370 /*
371 * Used to get the exact decompressed length, e.g. fiemap (consider lookback
372 * approach instead if possible since it's more metadata lightweight.)
373 */
374 #define EROFS_GET_BLOCKS_FIEMAP 0x0001
375 /* Used to map the whole extent if non-negligible data is requested for LZMA */
376 #define EROFS_GET_BLOCKS_READMORE 0x0002
377 /* Used to map tail extent for tailpacking inline or fragment pcluster */
378 #define EROFS_GET_BLOCKS_FINDTAIL 0x0004
379
380 enum {
381 Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX,
382 Z_EROFS_COMPRESSION_INTERLACED,
383 Z_EROFS_COMPRESSION_RUNTIME_MAX
384 };
385
386 struct erofs_map_dev {
387 struct super_block *m_sb;
388 struct erofs_device_info *m_dif;
389 struct block_device *m_bdev;
390
391 erofs_off_t m_pa;
392 unsigned int m_deviceid;
393 };
394
395 extern const struct super_operations erofs_sops;
396
397 extern const struct address_space_operations erofs_aops;
398 extern const struct address_space_operations erofs_fileio_aops;
399 extern const struct address_space_operations z_erofs_aops;
400 extern const struct address_space_operations erofs_fscache_access_aops;
401
402 extern const struct inode_operations erofs_generic_iops;
403 extern const struct inode_operations erofs_symlink_iops;
404 extern const struct inode_operations erofs_fast_symlink_iops;
405 extern const struct inode_operations erofs_dir_iops;
406
407 extern const struct file_operations erofs_file_fops;
408 extern const struct file_operations erofs_dir_fops;
409
410 extern const struct iomap_ops z_erofs_iomap_report_ops;
411
412 /* flags for erofs_fscache_register_cookie() */
413 #define EROFS_REG_COOKIE_SHARE 0x0001
414 #define EROFS_REG_COOKIE_NEED_NOEXIST 0x0002
415
416 void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
417 erofs_off_t *offset, int *lengthp);
418 void erofs_unmap_metabuf(struct erofs_buf *buf);
419 void erofs_put_metabuf(struct erofs_buf *buf);
420 void *erofs_bread(struct erofs_buf *buf, erofs_off_t offset, bool need_kmap);
421 int erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb,
422 bool in_metabox);
423 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
424 erofs_off_t offset, bool in_metabox);
425 int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev);
426 int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
427 u64 start, u64 len);
428 int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map);
429 void erofs_onlinefolio_init(struct folio *folio);
430 void erofs_onlinefolio_split(struct folio *folio);
431 void erofs_onlinefolio_end(struct folio *folio, int err, bool dirty);
432 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid);
433 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
434 struct kstat *stat, u32 request_mask,
435 unsigned int query_flags);
436 int erofs_namei(struct inode *dir, const struct qstr *name,
437 erofs_nid_t *nid, unsigned int *d_type);
438
erofs_vm_map_ram(struct page ** pages,unsigned int count)439 static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count)
440 {
441 int retried = 0;
442
443 while (1) {
444 void *p = vm_map_ram(pages, count, -1);
445
446 /* retry two more times (totally 3 times) */
447 if (p || ++retried >= 3)
448 return p;
449 vm_unmap_aliases();
450 }
451 return NULL;
452 }
453
454 int erofs_register_sysfs(struct super_block *sb);
455 void erofs_unregister_sysfs(struct super_block *sb);
456 int __init erofs_init_sysfs(void);
457 void erofs_exit_sysfs(void);
458
459 struct page *__erofs_allocpage(struct page **pagepool, gfp_t gfp, bool tryrsv);
erofs_allocpage(struct page ** pagepool,gfp_t gfp)460 static inline struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp)
461 {
462 return __erofs_allocpage(pagepool, gfp, false);
463 }
erofs_pagepool_add(struct page ** pagepool,struct page * page)464 static inline void erofs_pagepool_add(struct page **pagepool, struct page *page)
465 {
466 set_page_private(page, (unsigned long)*pagepool);
467 *pagepool = page;
468 }
469 void erofs_release_pages(struct page **pagepool);
470
471 #ifdef CONFIG_EROFS_FS_ZIP
472 #define MNGD_MAPPING(sbi) ((sbi)->managed_cache->i_mapping)
473
474 extern atomic_long_t erofs_global_shrink_cnt;
475 void erofs_shrinker_register(struct super_block *sb);
476 void erofs_shrinker_unregister(struct super_block *sb);
477 int __init erofs_init_shrinker(void);
478 void erofs_exit_shrinker(void);
479 int __init z_erofs_init_subsystem(void);
480 void z_erofs_exit_subsystem(void);
481 int z_erofs_init_super(struct super_block *sb);
482 unsigned long z_erofs_shrink_scan(struct erofs_sb_info *sbi,
483 unsigned long nr_shrink);
484 int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
485 int flags);
486 void *z_erofs_get_gbuf(unsigned int requiredpages);
487 void z_erofs_put_gbuf(void *ptr);
488 int z_erofs_gbuf_growsize(unsigned int nrpages);
489 int __init z_erofs_gbuf_init(void);
490 void z_erofs_gbuf_exit(void);
491 int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb);
492 #else
erofs_shrinker_register(struct super_block * sb)493 static inline void erofs_shrinker_register(struct super_block *sb) {}
erofs_shrinker_unregister(struct super_block * sb)494 static inline void erofs_shrinker_unregister(struct super_block *sb) {}
erofs_init_shrinker(void)495 static inline int erofs_init_shrinker(void) { return 0; }
erofs_exit_shrinker(void)496 static inline void erofs_exit_shrinker(void) {}
z_erofs_init_subsystem(void)497 static inline int z_erofs_init_subsystem(void) { return 0; }
z_erofs_exit_subsystem(void)498 static inline void z_erofs_exit_subsystem(void) {}
z_erofs_init_super(struct super_block * sb)499 static inline int z_erofs_init_super(struct super_block *sb) { return 0; }
500 #endif /* !CONFIG_EROFS_FS_ZIP */
501
502 #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE
503 struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev);
504 void erofs_fileio_submit_bio(struct bio *bio);
505 #else
erofs_fileio_bio_alloc(struct erofs_map_dev * mdev)506 static inline struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev) { return NULL; }
erofs_fileio_submit_bio(struct bio * bio)507 static inline void erofs_fileio_submit_bio(struct bio *bio) {}
508 #endif
509
510 #ifdef CONFIG_EROFS_FS_ONDEMAND
511 int erofs_fscache_register_fs(struct super_block *sb);
512 void erofs_fscache_unregister_fs(struct super_block *sb);
513
514 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
515 char *name, unsigned int flags);
516 void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache);
517 struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev);
518 void erofs_fscache_submit_bio(struct bio *bio);
519 #else
erofs_fscache_register_fs(struct super_block * sb)520 static inline int erofs_fscache_register_fs(struct super_block *sb)
521 {
522 return -EOPNOTSUPP;
523 }
erofs_fscache_unregister_fs(struct super_block * sb)524 static inline void erofs_fscache_unregister_fs(struct super_block *sb) {}
525
526 static inline
erofs_fscache_register_cookie(struct super_block * sb,char * name,unsigned int flags)527 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
528 char *name, unsigned int flags)
529 {
530 return ERR_PTR(-EOPNOTSUPP);
531 }
532
erofs_fscache_unregister_cookie(struct erofs_fscache * fscache)533 static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache)
534 {
535 }
erofs_fscache_bio_alloc(struct erofs_map_dev * mdev)536 static inline struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev) { return NULL; }
erofs_fscache_submit_bio(struct bio * bio)537 static inline void erofs_fscache_submit_bio(struct bio *bio) {}
538 #endif
539
540 long erofs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
541 long erofs_compat_ioctl(struct file *filp, unsigned int cmd,
542 unsigned long arg);
543
544 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
545
546 #endif /* __EROFS_INTERNAL_H */
547