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
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) && !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
erofs_workgroup_try_to_freeze(struct erofs_workgroup * grp,int val)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
erofs_workgroup_unfreeze(struct erofs_workgroup * grp,int orig_val)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
erofs_wait_on_workgroup_freezed(struct erofs_workgroup * grp)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
iloc(struct erofs_sb_info * sbi,erofs_nid_t nid)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
erofs_inode_datablocks(struct inode * inode)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
erofs_bitrange(unsigned int value,unsigned int bit,unsigned int bits)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
erofs_inode_version(unsigned int value)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
erofs_inode_datalayout(unsigned int value)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
erofs_grab_cache_page_nowait(struct address_space * mapping,pgoff_t index)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
z_erofs_fill_inode(struct inode * inode)450 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)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 */
erofs_inode_hash(erofs_nid_t nid)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
erofs_vm_map_ram(struct page ** pages,unsigned int count)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);
erofs_pagepool_add(struct page ** pagepool,struct page * page)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
erofs_shrinker_register(struct super_block * sb)569 static inline void erofs_shrinker_register(struct super_block *sb) {}
erofs_shrinker_unregister(struct super_block * sb)570 static inline void erofs_shrinker_unregister(struct super_block *sb) {}
erofs_init_shrinker(void)571 static inline int erofs_init_shrinker(void) { return 0; }
erofs_exit_shrinker(void)572 static inline void erofs_exit_shrinker(void) {}
z_erofs_init_zip_subsystem(void)573 static inline int z_erofs_init_zip_subsystem(void) { return 0; }
z_erofs_exit_zip_subsystem(void)574 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)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
z_erofs_lzma_init(void)594 static inline int z_erofs_lzma_init(void) { return 0; }
z_erofs_lzma_exit(void)595 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)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 /* flags for erofs_fscache_register_cookie() */
608 #define EROFS_REG_COOKIE_NEED_INODE 1
609 #define EROFS_REG_COOKIE_NEED_NOEXIST 2
610
611 /* fscache.c */
612 #ifdef CONFIG_EROFS_FS_ONDEMAND
613 int erofs_fscache_register_fs(struct super_block *sb);
614 void erofs_fscache_unregister_fs(struct super_block *sb);
615
616 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
617 char *name,
618 unsigned int flags);
619 void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache);
620
621 extern const struct address_space_operations erofs_fscache_access_aops;
622 #else
erofs_fscache_register_fs(struct super_block * sb)623 static inline int erofs_fscache_register_fs(struct super_block *sb)
624 {
625 return -EOPNOTSUPP;
626 }
erofs_fscache_unregister_fs(struct super_block * sb)627 static inline void erofs_fscache_unregister_fs(struct super_block *sb) {}
628
629 static inline
erofs_fscache_register_cookie(struct super_block * sb,char * name,unsigned int flags)630 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
631 char *name,
632 unsigned int flags)
633 {
634 return ERR_PTR(-EOPNOTSUPP);
635 }
636
erofs_fscache_unregister_cookie(struct erofs_fscache * fscache)637 static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache)
638 {
639 }
640 #endif
641
642 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
643
644 #endif /* __EROFS_INTERNAL_H */
645