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 unsigned int mount_opt;
63 };
64
65 struct erofs_dev_context {
66 struct idr tree;
67 struct rw_semaphore rwsem;
68
69 unsigned int extra_devices;
70 bool flatdev;
71 };
72
73 /* all filesystem-wide lz4 configurations */
74 struct erofs_sb_lz4_info {
75 /* # of pages needed for EROFS lz4 rolling decompression */
76 u16 max_distance_pages;
77 /* maximum possible blocks for pclusters in the filesystem */
78 u16 max_pclusterblks;
79 };
80
81 struct erofs_domain {
82 refcount_t ref;
83 struct list_head list;
84 struct fscache_volume *volume;
85 char *domain_id;
86 };
87
88 struct erofs_fscache {
89 struct fscache_cookie *cookie;
90 struct inode *inode; /* anonymous inode for the blob */
91
92 /* used for share domain mode */
93 struct erofs_domain *domain;
94 struct list_head node;
95 refcount_t ref;
96 char *name;
97 };
98
99 struct erofs_xattr_prefix_item {
100 struct erofs_xattr_long_prefix *prefix;
101 u8 infix_len;
102 };
103
104 struct erofs_sb_info {
105 struct erofs_device_info dif0;
106 struct erofs_mount_opts opt; /* options */
107 #ifdef CONFIG_EROFS_FS_ZIP
108 /* list for all registered superblocks, mainly for shrinker */
109 struct list_head list;
110 struct mutex umount_mutex;
111
112 /* managed XArray arranged in physical block number */
113 struct xarray managed_pslots;
114
115 unsigned int sync_decompress; /* strategy for sync decompression */
116 unsigned int shrinker_run_no;
117
118 /* pseudo inode to manage cached pages */
119 struct inode *managed_cache;
120
121 struct erofs_sb_lz4_info lz4;
122 #endif /* CONFIG_EROFS_FS_ZIP */
123 struct inode *packed_inode;
124 struct inode *metabox_inode;
125 struct erofs_dev_context *devs;
126 u64 total_blocks;
127
128 u32 meta_blkaddr;
129 #ifdef CONFIG_EROFS_FS_XATTR
130 u32 xattr_blkaddr;
131 u32 xattr_prefix_start;
132 u8 xattr_prefix_count;
133 u8 ishare_xattr_prefix_id;
134 struct erofs_xattr_prefix_item *xattr_prefixes;
135 unsigned int xattr_filter_reserved;
136 #endif
137 u16 device_id_mask; /* valid bits of device id to be used */
138
139 unsigned char islotbits; /* inode slot unit size in bit shift */
140 unsigned char blkszbits; /* filesystem block size in bit shift */
141
142 u32 sb_size; /* total superblock size */
143 u32 fixed_nsec;
144 s64 epoch;
145
146 /* what we really care is nid, rather than ino.. */
147 erofs_nid_t root_nid;
148 erofs_nid_t packed_nid;
149 erofs_nid_t metabox_nid;
150 /* used for statfs, f_files - f_favail */
151 u64 inos;
152
153 char *volume_name;
154 u32 feature_compat;
155 u32 feature_incompat;
156 u16 available_compr_algs;
157
158 /* sysfs support */
159 struct kobject s_kobj; /* /sys/fs/erofs/<devname> */
160 struct completion s_kobj_unregister;
161 erofs_off_t dir_ra_bytes;
162
163 /* fscache support */
164 struct fscache_volume *volume;
165 struct erofs_domain *domain;
166 char *fsid;
167 char *domain_id;
168 };
169
170 #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
171 #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info)
172
173 /* Mount flags set via mount options or defaults */
174 #define EROFS_MOUNT_XATTR_USER 0x00000010
175 #define EROFS_MOUNT_POSIX_ACL 0x00000020
176 #define EROFS_MOUNT_DAX_ALWAYS 0x00000040
177 #define EROFS_MOUNT_DAX_NEVER 0x00000080
178 #define EROFS_MOUNT_DIRECT_IO 0x00000100
179 #define EROFS_MOUNT_INODE_SHARE 0x00000200
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
190 extern struct file_system_type erofs_anon_fs_type;
191
erofs_is_fscache_mode(struct super_block * sb)192 static inline bool erofs_is_fscache_mode(struct super_block *sb)
193 {
194 return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) &&
195 !erofs_is_fileio_mode(EROFS_SB(sb)) && !sb->s_bdev;
196 }
197
198 enum {
199 EROFS_ZIP_CACHE_DISABLED,
200 EROFS_ZIP_CACHE_READAHEAD,
201 EROFS_ZIP_CACHE_READAROUND
202 };
203
204 struct erofs_buf {
205 struct address_space *mapping;
206 struct file *file;
207 u64 off;
208 struct page *page;
209 void *base;
210 };
211 #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL })
212
213 #define erofs_blknr(sb, pos) ((erofs_blk_t)((pos) >> (sb)->s_blocksize_bits))
214 #define erofs_blkoff(sb, pos) ((pos) & ((sb)->s_blocksize - 1))
215 #define erofs_pos(sb, blk) ((erofs_off_t)(blk) << (sb)->s_blocksize_bits)
216 #define erofs_iblks(i) (round_up((i)->i_size, i_blocksize(i)) >> (i)->i_blkbits)
217
218 #define EROFS_FEATURE_FUNCS(name, compat, feature) \
219 static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \
220 { \
221 return sbi->feature_##compat & EROFS_FEATURE_##feature; \
222 }
223
EROFS_FEATURE_FUNCS(lz4_0padding,incompat,INCOMPAT_LZ4_0PADDING)224 EROFS_FEATURE_FUNCS(lz4_0padding, incompat, INCOMPAT_LZ4_0PADDING)
225 EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
226 EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
227 EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE)
228 EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)
229 EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2)
230 EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING)
231 EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS)
232 EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
233 EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES)
234 EROFS_FEATURE_FUNCS(48bit, incompat, INCOMPAT_48BIT)
235 EROFS_FEATURE_FUNCS(metabox, incompat, INCOMPAT_METABOX)
236 EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
237 EROFS_FEATURE_FUNCS(xattr_filter, compat, COMPAT_XATTR_FILTER)
238 EROFS_FEATURE_FUNCS(shared_ea_in_metabox, compat, COMPAT_SHARED_EA_IN_METABOX)
239 EROFS_FEATURE_FUNCS(plain_xattr_pfx, compat, COMPAT_PLAIN_XATTR_PFX)
240 EROFS_FEATURE_FUNCS(ishare_xattrs, compat, COMPAT_ISHARE_XATTRS)
241
242 static inline u64 erofs_nid_to_ino64(struct erofs_sb_info *sbi, erofs_nid_t nid)
243 {
244 if (!erofs_sb_has_metabox(sbi))
245 return nid;
246
247 /*
248 * When metadata compression is enabled, avoid generating excessively
249 * large inode numbers for metadata-compressed inodes. Shift NIDs in
250 * the 31-62 bit range left by one and move the metabox flag to bit 31.
251 *
252 * Note: on-disk NIDs remain unchanged as they are primarily used for
253 * compatibility with non-LFS 32-bit applications.
254 */
255 return ((nid << 1) & GENMASK_ULL(63, 32)) | (nid & GENMASK(30, 0)) |
256 ((nid >> EROFS_DIRENT_NID_METABOX_BIT) << 31);
257 }
258
259 /* atomic flag definitions */
260 #define EROFS_I_EA_INITED_BIT 0
261 #define EROFS_I_Z_INITED_BIT 1
262
263 /* bitlock definitions (arranged in reverse order) */
264 #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1)
265 #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2)
266
267 /* default readahead size of directories */
268 #define EROFS_DIR_RA_BYTES 16384
269
270 struct erofs_inode_fingerprint {
271 u8 *opaque;
272 int size;
273 };
274
275 struct erofs_inode {
276 erofs_nid_t nid;
277
278 /* atomic flags (including bitlocks) */
279 unsigned long flags;
280
281 unsigned char datalayout;
282 unsigned char inode_isize;
283 bool dot_omitted;
284 unsigned int xattr_isize;
285
286 unsigned int xattr_name_filter;
287 unsigned int xattr_shared_count;
288 unsigned int *xattr_shared_xattrs;
289
290 union {
291 erofs_blk_t startblk;
292 struct {
293 unsigned short chunkformat;
294 unsigned char chunkbits;
295 };
296 #ifdef CONFIG_EROFS_FS_ZIP
297 struct {
298 unsigned short z_advise;
299 unsigned char z_algorithmtype[2];
300 unsigned char z_lclusterbits;
301 union {
302 u64 z_tailextent_headlcn;
303 u64 z_extents;
304 };
305 erofs_off_t z_fragmentoff;
306 unsigned short z_idata_size;
307 };
308 #endif /* CONFIG_EROFS_FS_ZIP */
309 };
310 #ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
311 struct list_head ishare_list;
312 union {
313 /* for each anon shared inode */
314 struct {
315 struct erofs_inode_fingerprint fingerprint;
316 spinlock_t ishare_lock;
317 };
318 /* for each real inode */
319 struct inode *sharedinode;
320 };
321 #endif
322 /* the corresponding vfs inode */
323 struct inode vfs_inode;
324 };
325
326 #define EROFS_I(ptr) container_of(ptr, struct erofs_inode, vfs_inode)
327
erofs_inode_in_metabox(struct inode * inode)328 static inline bool erofs_inode_in_metabox(struct inode *inode)
329 {
330 return EROFS_I(inode)->nid & BIT_ULL(EROFS_DIRENT_NID_METABOX_BIT);
331 }
332
erofs_iloc(struct inode * inode)333 static inline erofs_off_t erofs_iloc(struct inode *inode)
334 {
335 struct erofs_sb_info *sbi = EROFS_I_SB(inode);
336 erofs_nid_t nid_lo = EROFS_I(inode)->nid & EROFS_DIRENT_NID_MASK;
337
338 if (erofs_inode_in_metabox(inode))
339 return nid_lo << sbi->islotbits;
340 return erofs_pos(inode->i_sb, sbi->meta_blkaddr) +
341 (nid_lo << sbi->islotbits);
342 }
343
erofs_inode_version(unsigned int ifmt)344 static inline unsigned int erofs_inode_version(unsigned int ifmt)
345 {
346 return (ifmt >> EROFS_I_VERSION_BIT) & EROFS_I_VERSION_MASK;
347 }
348
erofs_inode_datalayout(unsigned int ifmt)349 static inline unsigned int erofs_inode_datalayout(unsigned int ifmt)
350 {
351 return (ifmt >> EROFS_I_DATALAYOUT_BIT) & EROFS_I_DATALAYOUT_MASK;
352 }
353
354 /* reclaiming is never triggered when allocating new folios. */
erofs_grab_folio_nowait(struct address_space * as,pgoff_t index)355 static inline struct folio *erofs_grab_folio_nowait(struct address_space *as,
356 pgoff_t index)
357 {
358 return __filemap_get_folio(as, index,
359 FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT,
360 readahead_gfp_mask(as) & ~__GFP_RECLAIM);
361 }
362
363 /* Has a disk mapping */
364 #define EROFS_MAP_MAPPED 0x0001
365 /* Located in metadata (could be copied from bd_inode) */
366 #define EROFS_MAP_META 0x0002
367 /* The extent is encoded */
368 #define EROFS_MAP_ENCODED 0x0004
369 /* The length of extent is full */
370 #define EROFS_MAP_FULL_MAPPED 0x0008
371 /* Located in the special packed inode */
372 #define __EROFS_MAP_FRAGMENT 0x0010
373 /* The extent refers to partial decompressed data */
374 #define EROFS_MAP_PARTIAL_REF 0x0020
375
376 #define EROFS_MAP_FRAGMENT (EROFS_MAP_MAPPED | __EROFS_MAP_FRAGMENT)
377
378 struct erofs_map_blocks {
379 struct erofs_buf buf;
380
381 erofs_off_t m_pa, m_la;
382 u64 m_plen, m_llen;
383
384 unsigned short m_deviceid;
385 char m_algorithmformat;
386 unsigned int m_flags;
387 };
388
389 /*
390 * Used to get the exact decompressed length, e.g. fiemap (consider lookback
391 * approach instead if possible since it's more metadata lightweight.)
392 */
393 #define EROFS_GET_BLOCKS_FIEMAP 0x0001
394 /* Used to map the whole extent if non-negligible data is requested for LZMA */
395 #define EROFS_GET_BLOCKS_READMORE 0x0002
396 /* Used to map tail extent for tailpacking inline or fragment pcluster */
397 #define EROFS_GET_BLOCKS_FINDTAIL 0x0004
398
399 enum {
400 Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX,
401 Z_EROFS_COMPRESSION_INTERLACED,
402 Z_EROFS_COMPRESSION_RUNTIME_MAX
403 };
404
405 struct erofs_map_dev {
406 struct super_block *m_sb;
407 struct erofs_device_info *m_dif;
408 struct block_device *m_bdev;
409
410 erofs_off_t m_pa;
411 unsigned int m_deviceid;
412 };
413
414 extern const struct super_operations erofs_sops;
415
416 extern const struct address_space_operations erofs_aops;
417 extern const struct address_space_operations erofs_fileio_aops;
418 extern const struct address_space_operations z_erofs_aops;
419 extern const struct address_space_operations erofs_fscache_access_aops;
420
421 extern const struct inode_operations erofs_generic_iops;
422 extern const struct inode_operations erofs_symlink_iops;
423 extern const struct inode_operations erofs_fast_symlink_iops;
424 extern const struct inode_operations erofs_dir_iops;
425
426 extern const struct file_operations erofs_file_fops;
427 extern const struct file_operations erofs_dir_fops;
428 extern const struct file_operations erofs_ishare_fops;
429
430 extern const struct iomap_ops z_erofs_iomap_report_ops;
431
432 /* flags for erofs_fscache_register_cookie() */
433 #define EROFS_REG_COOKIE_SHARE 0x0001
434 #define EROFS_REG_COOKIE_NEED_NOEXIST 0x0002
435
436 void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
437 erofs_off_t *offset, int *lengthp);
438 void erofs_unmap_metabuf(struct erofs_buf *buf);
439 void erofs_put_metabuf(struct erofs_buf *buf);
440 void *erofs_bread(struct erofs_buf *buf, erofs_off_t offset, bool need_kmap);
441 int erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb,
442 bool in_metabox);
443 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
444 erofs_off_t offset, bool in_metabox);
445 int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev);
446 int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
447 u64 start, u64 len);
448 int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map);
449 void erofs_onlinefolio_init(struct folio *folio);
450 void erofs_onlinefolio_split(struct folio *folio);
451 void erofs_onlinefolio_end(struct folio *folio, int err, bool dirty);
452 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid);
453 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
454 struct kstat *stat, u32 request_mask,
455 unsigned int query_flags);
456 int erofs_namei(struct inode *dir, const struct qstr *name,
457 erofs_nid_t *nid, unsigned int *d_type);
458
erofs_vm_map_ram(struct page ** pages,unsigned int count)459 static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count)
460 {
461 int retried = 0;
462
463 while (1) {
464 void *p = vm_map_ram(pages, count, -1);
465
466 /* retry two more times (totally 3 times) */
467 if (p || ++retried >= 3)
468 return p;
469 vm_unmap_aliases();
470 }
471 return NULL;
472 }
473
474 static inline const struct address_space_operations *
erofs_get_aops(struct inode * realinode,bool no_fscache)475 erofs_get_aops(struct inode *realinode, bool no_fscache)
476 {
477 if (erofs_inode_is_data_compressed(EROFS_I(realinode)->datalayout)) {
478 if (!IS_ENABLED(CONFIG_EROFS_FS_ZIP))
479 return ERR_PTR(-EOPNOTSUPP);
480 DO_ONCE_LITE_IF(realinode->i_blkbits != PAGE_SHIFT,
481 erofs_info, realinode->i_sb,
482 "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
483 return &z_erofs_aops;
484 }
485 if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !no_fscache &&
486 erofs_is_fscache_mode(realinode->i_sb))
487 return &erofs_fscache_access_aops;
488 if (IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) &&
489 erofs_is_fileio_mode(EROFS_SB(realinode->i_sb)))
490 return &erofs_fileio_aops;
491 return &erofs_aops;
492 }
493
494 int erofs_register_sysfs(struct super_block *sb);
495 void erofs_unregister_sysfs(struct super_block *sb);
496 int __init erofs_init_sysfs(void);
497 void erofs_exit_sysfs(void);
498
499 struct page *__erofs_allocpage(struct page **pagepool, gfp_t gfp, bool tryrsv);
erofs_allocpage(struct page ** pagepool,gfp_t gfp)500 static inline struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp)
501 {
502 return __erofs_allocpage(pagepool, gfp, false);
503 }
erofs_pagepool_add(struct page ** pagepool,struct page * page)504 static inline void erofs_pagepool_add(struct page **pagepool, struct page *page)
505 {
506 set_page_private(page, (unsigned long)*pagepool);
507 *pagepool = page;
508 }
509 void erofs_release_pages(struct page **pagepool);
510
511 #ifdef CONFIG_EROFS_FS_ZIP
512 #define MNGD_MAPPING(sbi) ((sbi)->managed_cache->i_mapping)
513
514 extern atomic_long_t erofs_global_shrink_cnt;
515 void erofs_shrinker_register(struct super_block *sb);
516 void erofs_shrinker_unregister(struct super_block *sb);
517 int __init erofs_init_shrinker(void);
518 void erofs_exit_shrinker(void);
519 int __init z_erofs_init_subsystem(void);
520 void z_erofs_exit_subsystem(void);
521 int z_erofs_init_super(struct super_block *sb);
522 unsigned long z_erofs_shrink_scan(struct erofs_sb_info *sbi,
523 unsigned long nr_shrink);
524 int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
525 int flags);
526 void *z_erofs_get_gbuf(unsigned int requiredpages);
527 void z_erofs_put_gbuf(void *ptr);
528 int z_erofs_gbuf_growsize(unsigned int nrpages);
529 int __init z_erofs_gbuf_init(void);
530 void z_erofs_gbuf_exit(void);
531 #else
erofs_shrinker_register(struct super_block * sb)532 static inline void erofs_shrinker_register(struct super_block *sb) {}
erofs_shrinker_unregister(struct super_block * sb)533 static inline void erofs_shrinker_unregister(struct super_block *sb) {}
erofs_init_shrinker(void)534 static inline int erofs_init_shrinker(void) { return 0; }
erofs_exit_shrinker(void)535 static inline void erofs_exit_shrinker(void) {}
z_erofs_init_subsystem(void)536 static inline int z_erofs_init_subsystem(void) { return 0; }
z_erofs_exit_subsystem(void)537 static inline void z_erofs_exit_subsystem(void) {}
z_erofs_init_super(struct super_block * sb)538 static inline int z_erofs_init_super(struct super_block *sb) { return 0; }
539 #endif /* !CONFIG_EROFS_FS_ZIP */
540 int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb);
541
542 #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE
543 struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev);
544 void erofs_fileio_submit_bio(struct bio *bio);
545 #else
erofs_fileio_bio_alloc(struct erofs_map_dev * mdev)546 static inline struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev) { return NULL; }
erofs_fileio_submit_bio(struct bio * bio)547 static inline void erofs_fileio_submit_bio(struct bio *bio) {}
548 #endif
549
550 #ifdef CONFIG_EROFS_FS_ONDEMAND
551 int erofs_fscache_register_fs(struct super_block *sb);
552 void erofs_fscache_unregister_fs(struct super_block *sb);
553
554 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
555 char *name, unsigned int flags);
556 void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache);
557 struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev);
558 void erofs_fscache_submit_bio(struct bio *bio);
559 #else
erofs_fscache_register_fs(struct super_block * sb)560 static inline int erofs_fscache_register_fs(struct super_block *sb)
561 {
562 return -EOPNOTSUPP;
563 }
erofs_fscache_unregister_fs(struct super_block * sb)564 static inline void erofs_fscache_unregister_fs(struct super_block *sb) {}
565
566 static inline
erofs_fscache_register_cookie(struct super_block * sb,char * name,unsigned int flags)567 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
568 char *name, unsigned int flags)
569 {
570 return ERR_PTR(-EOPNOTSUPP);
571 }
572
erofs_fscache_unregister_cookie(struct erofs_fscache * fscache)573 static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache)
574 {
575 }
erofs_fscache_bio_alloc(struct erofs_map_dev * mdev)576 static inline struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev) { return NULL; }
erofs_fscache_submit_bio(struct bio * bio)577 static inline void erofs_fscache_submit_bio(struct bio *bio) {}
578 #endif
579
580 #ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
581 int __init erofs_init_ishare(void);
582 void erofs_exit_ishare(void);
583 bool erofs_ishare_fill_inode(struct inode *inode);
584 void erofs_ishare_free_inode(struct inode *inode);
585 struct inode *erofs_real_inode(struct inode *inode, bool *need_iput);
586 #else
erofs_init_ishare(void)587 static inline int erofs_init_ishare(void) { return 0; }
erofs_exit_ishare(void)588 static inline void erofs_exit_ishare(void) {}
erofs_ishare_fill_inode(struct inode * inode)589 static inline bool erofs_ishare_fill_inode(struct inode *inode) { return false; }
erofs_ishare_free_inode(struct inode * inode)590 static inline void erofs_ishare_free_inode(struct inode *inode) {}
erofs_real_inode(struct inode * inode,bool * need_iput)591 static inline struct inode *erofs_real_inode(struct inode *inode, bool *need_iput)
592 {
593 *need_iput = false;
594 return inode;
595 }
596 #endif
597
598 long erofs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
599 long erofs_compat_ioctl(struct file *filp, unsigned int cmd,
600 unsigned long arg);
601
602 #endif /* __EROFS_INTERNAL_H */
603