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