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_warn(sb, fmt, ...) \
27 _erofs_printk(sb, KERN_WARNING fmt "\n", ##__VA_ARGS__)
28 #define erofs_info(sb, fmt, ...) \
29 _erofs_printk(sb, KERN_INFO fmt "\n", ##__VA_ARGS__)
30
31 #ifdef CONFIG_EROFS_FS_DEBUG
32 #define DBG_BUGON BUG_ON
33 #else
34 #define DBG_BUGON(x) ((void)(x))
35 #endif /* !CONFIG_EROFS_FS_DEBUG */
36
37 /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */
38 #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1
39
40 typedef u64 erofs_nid_t;
41 typedef u64 erofs_off_t;
42 typedef u64 erofs_blk_t;
43
44 struct erofs_device_info {
45 char *path;
46 struct file *file;
47 struct dax_device *dax_dev;
48 u64 fsoff, dax_part_off;
49
50 erofs_blk_t blocks;
51 erofs_blk_t uniaddr;
52 };
53
54 enum {
55 EROFS_SYNC_DECOMPRESS_AUTO,
56 EROFS_SYNC_DECOMPRESS_FORCE_ON,
57 EROFS_SYNC_DECOMPRESS_FORCE_OFF
58 };
59
60 struct erofs_mount_opts {
61 /* current strategy of how to use managed cache */
62 unsigned char cache_strategy;
63 unsigned int mount_opt;
64 };
65
66 struct erofs_dev_context {
67 struct idr tree;
68 struct rw_semaphore rwsem;
69
70 unsigned int extra_devices;
71 bool flatdev;
72 };
73
74 /* all filesystem-wide lz4 configurations */
75 struct erofs_sb_lz4_info {
76 /* # of pages needed for EROFS lz4 rolling decompression */
77 u16 max_distance_pages;
78 /* maximum possible blocks for pclusters in the filesystem */
79 u16 max_pclusterblks;
80 };
81
82 struct erofs_xattr_prefix_item {
83 struct erofs_xattr_long_prefix *prefix;
84 u8 infix_len;
85 };
86
87 struct erofs_sb_info {
88 struct erofs_device_info dif0;
89 struct erofs_mount_opts opt; /* options */
90 #ifdef CONFIG_EROFS_FS_ZIP
91 /* list for all registered superblocks, mainly for shrinker */
92 struct list_head list;
93 struct mutex umount_mutex;
94
95 /* managed XArray arranged in physical block number */
96 struct xarray managed_pslots;
97
98 unsigned int sync_decompress; /* strategy for sync decompression */
99 unsigned int shrinker_run_no;
100
101 struct erofs_sb_lz4_info lz4;
102 #endif /* CONFIG_EROFS_FS_ZIP */
103 struct inode *managed_cache; /* pseudo inode to cache physical data */
104 struct inode *packed_inode;
105 struct inode *metabox_inode;
106 struct erofs_dev_context *devs;
107 u64 total_blocks;
108
109 u32 meta_blkaddr;
110 #ifdef CONFIG_EROFS_FS_XATTR
111 u32 xattr_blkaddr;
112 u32 xattr_prefix_start;
113 u8 xattr_prefix_count;
114 u8 ishare_xattr_prefix_id;
115 struct erofs_xattr_prefix_item *xattr_prefixes;
116 unsigned int xattr_filter_reserved;
117 #endif
118 u16 device_id_mask; /* valid bits of device id to be used */
119
120 unsigned char islotbits; /* inode slot unit size in bit shift */
121 unsigned char blkszbits; /* filesystem block size in bit shift */
122
123 u32 sb_size; /* total superblock size */
124 u32 fixed_nsec;
125 s64 epoch;
126
127 /* what we really care is nid, rather than ino.. */
128 erofs_nid_t root_nid;
129 erofs_nid_t packed_nid;
130 erofs_nid_t metabox_nid;
131 /* used for statfs, f_files - f_favail */
132 u64 inos;
133
134 char *volume_name;
135 u32 feature_compat;
136 u32 feature_incompat;
137 u16 available_compr_algs;
138
139 /* sysfs support */
140 struct kobject s_kobj; /* /sys/fs/erofs/<devname> */
141 struct completion s_kobj_unregister;
142 erofs_off_t dir_ra_bytes;
143
144 char *domain_id;
145 };
146
147 #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
148 #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info)
149
150 /* Mount flags set via mount options or defaults */
151 #define EROFS_MOUNT_XATTR_USER 0x00000010
152 #define EROFS_MOUNT_POSIX_ACL 0x00000020
153 #define EROFS_MOUNT_DAX_ALWAYS 0x00000040
154 #define EROFS_MOUNT_DAX_NEVER 0x00000080
155 #define EROFS_MOUNT_DIRECT_IO 0x00000100
156 #define EROFS_MOUNT_INODE_SHARE 0x00000200
157
158 #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option)
159 #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option)
160 #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option)
161
erofs_is_fileio_mode(struct erofs_sb_info * sbi)162 static inline bool erofs_is_fileio_mode(struct erofs_sb_info *sbi)
163 {
164 return IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) && sbi->dif0.file;
165 }
166
167 extern struct file_system_type erofs_anon_fs_type;
168
169 enum {
170 EROFS_ZIP_CACHE_DISABLED,
171 EROFS_ZIP_CACHE_READAHEAD,
172 EROFS_ZIP_CACHE_READAROUND
173 };
174
175 struct erofs_buf {
176 struct address_space *mapping;
177 u64 off;
178 struct page *page;
179 void *base;
180 bool mc;
181 };
182 #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL })
183
184 #define erofs_blknr(sb, pos) ((erofs_blk_t)((pos) >> (sb)->s_blocksize_bits))
185 #define erofs_blkoff(sb, pos) ((pos) & ((sb)->s_blocksize - 1))
186 #define erofs_pos(sb, blk) ((erofs_off_t)(blk) << (sb)->s_blocksize_bits)
187 #define erofs_iblks(i) (round_up((i)->i_size, i_blocksize(i)) >> (i)->i_blkbits)
188
189 #define EROFS_FEATURE_FUNCS(name, compat, feature) \
190 static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \
191 { \
192 return sbi->feature_##compat & EROFS_FEATURE_##feature; \
193 }
194
EROFS_FEATURE_FUNCS(lz4_0padding,incompat,INCOMPAT_LZ4_0PADDING)195 EROFS_FEATURE_FUNCS(lz4_0padding, incompat, INCOMPAT_LZ4_0PADDING)
196 EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
197 EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
198 EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE)
199 EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)
200 EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2)
201 EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING)
202 EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS)
203 EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
204 EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES)
205 EROFS_FEATURE_FUNCS(48bit, incompat, INCOMPAT_48BIT)
206 EROFS_FEATURE_FUNCS(metabox, incompat, INCOMPAT_METABOX)
207 EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
208 EROFS_FEATURE_FUNCS(xattr_filter, compat, COMPAT_XATTR_FILTER)
209 EROFS_FEATURE_FUNCS(shared_ea_in_metabox, compat, COMPAT_SHARED_EA_IN_METABOX)
210 EROFS_FEATURE_FUNCS(plain_xattr_pfx, compat, COMPAT_PLAIN_XATTR_PFX)
211 EROFS_FEATURE_FUNCS(ishare_xattrs, compat, COMPAT_ISHARE_XATTRS)
212
213 static inline u64 erofs_nid_to_ino64(struct erofs_sb_info *sbi, erofs_nid_t nid)
214 {
215 if (!erofs_sb_has_metabox(sbi))
216 return nid;
217
218 /*
219 * When metadata compression is enabled, avoid generating excessively
220 * large inode numbers for metadata-compressed inodes. Shift NIDs in
221 * the 31-62 bit range left by one and move the metabox flag to bit 31.
222 *
223 * Note: on-disk NIDs remain unchanged as they are primarily used for
224 * compatibility with non-LFS 32-bit applications.
225 */
226 return ((nid << 1) & GENMASK_ULL(63, 32)) | (nid & GENMASK(30, 0)) |
227 ((nid >> EROFS_DIRENT_NID_METABOX_BIT) << 31);
228 }
229
230 /* atomic flag definitions */
231 #define EROFS_I_EA_INITED_BIT 0
232 #define EROFS_I_Z_INITED_BIT 1
233
234 /* bitlock definitions (arranged in reverse order) */
235 #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1)
236 #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2)
237
238 /* default readahead size of directories */
239 #define EROFS_DIR_RA_BYTES 16384
240
241 struct erofs_inode_fingerprint {
242 u8 *opaque;
243 int size;
244 };
245
246 struct erofs_inode {
247 erofs_nid_t nid;
248
249 /* atomic flags (including bitlocks) */
250 unsigned long flags;
251
252 unsigned char datalayout;
253 unsigned char inode_isize;
254 bool dot_omitted;
255 unsigned int xattr_isize;
256
257 unsigned int xattr_name_filter;
258 unsigned int xattr_shared_count;
259 unsigned int *xattr_shared_xattrs;
260
261 union {
262 erofs_blk_t startblk;
263 struct {
264 unsigned short chunkformat;
265 unsigned char chunkbits;
266 };
267 #ifdef CONFIG_EROFS_FS_ZIP
268 struct {
269 unsigned short z_advise;
270 unsigned char z_algofmt[2];
271 unsigned char z_lclusterbits;
272 union {
273 u64 z_tailextent_headlcn;
274 u64 z_extents;
275 };
276 erofs_off_t z_fragmentoff;
277 unsigned short z_idata_size;
278 };
279 #endif /* CONFIG_EROFS_FS_ZIP */
280 };
281 #ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
282 struct list_head ishare_list;
283 union {
284 /* for each anon shared inode */
285 struct {
286 struct erofs_inode_fingerprint fingerprint;
287 spinlock_t ishare_lock;
288 };
289 /* for each real filesystem inode */
290 struct dentry *sharedentry;
291 };
292 #endif
293 /* the corresponding vfs inode */
294 struct inode vfs_inode;
295 };
296
297 #define EROFS_I(ptr) container_of(ptr, struct erofs_inode, vfs_inode)
298
erofs_inode_in_metabox(struct inode * inode)299 static inline bool erofs_inode_in_metabox(struct inode *inode)
300 {
301 return EROFS_I(inode)->nid & BIT_ULL(EROFS_DIRENT_NID_METABOX_BIT);
302 }
303
erofs_iloc(struct inode * inode)304 static inline erofs_off_t erofs_iloc(struct inode *inode)
305 {
306 struct erofs_sb_info *sbi = EROFS_I_SB(inode);
307 erofs_nid_t nid_lo = EROFS_I(inode)->nid & EROFS_DIRENT_NID_MASK;
308
309 if (erofs_inode_in_metabox(inode))
310 return nid_lo << sbi->islotbits;
311 return erofs_pos(inode->i_sb, sbi->meta_blkaddr) +
312 (nid_lo << sbi->islotbits);
313 }
314
erofs_inode_version(unsigned int ifmt)315 static inline unsigned int erofs_inode_version(unsigned int ifmt)
316 {
317 return (ifmt >> EROFS_I_VERSION_BIT) & EROFS_I_VERSION_MASK;
318 }
319
erofs_inode_datalayout(unsigned int ifmt)320 static inline unsigned int erofs_inode_datalayout(unsigned int ifmt)
321 {
322 return (ifmt >> EROFS_I_DATALAYOUT_BIT) & EROFS_I_DATALAYOUT_MASK;
323 }
324
325 /* reclaiming is never triggered when allocating new folios. */
erofs_grab_folio_nowait(struct address_space * as,pgoff_t index)326 static inline struct folio *erofs_grab_folio_nowait(struct address_space *as,
327 pgoff_t index)
328 {
329 return __filemap_get_folio(as, index,
330 FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT,
331 readahead_gfp_mask(as) & ~__GFP_RECLAIM);
332 }
333
334 /* Allocated on disk at @m_pa (e.g. NOT a fragment extent) */
335 #define EROFS_MAP_MAPPED 0x0001
336 /* Located in metadata (could be copied from bd_inode) */
337 #define EROFS_MAP_META 0x0002
338 /* @m_llen may be truncated by the runtime compared to the on-disk record */
339 #define EROFS_MAP_PARTIAL_MAPPED 0x0004
340 /* The on-disk @m_llen may cover only part of the encoded data */
341 #define EROFS_MAP_PARTIAL_REF 0x0008
342 /* Located in the special packed inode */
343 #define EROFS_MAP_FRAGMENT 0x0010
344 /* The encoded on-disk data will be fully handled (decompressed) */
345 #define EROFS_MAP_FULL(f) (!((f) & (EROFS_MAP_PARTIAL_MAPPED | \
346 EROFS_MAP_PARTIAL_REF)))
347
348 struct erofs_map_blocks {
349 struct erofs_buf buf;
350
351 erofs_off_t m_pa, m_la;
352 u64 m_plen, m_llen;
353
354 unsigned short m_deviceid;
355 char m_algorithmformat;
356 unsigned int m_flags;
357 };
358
359 /*
360 * Used to get the exact decompressed length, e.g. fiemap (consider lookback
361 * approach instead if possible since it's more metadata lightweight.)
362 */
363 #define EROFS_GET_BLOCKS_FIEMAP 0x0001
364 /* Used to map the whole extent if non-negligible data is requested for LZMA */
365 #define EROFS_GET_BLOCKS_READMORE 0x0002
366 /* Used to map tail extent for tailpacking inline or fragment pcluster */
367 #define EROFS_GET_BLOCKS_FINDTAIL 0x0004
368
369 enum {
370 Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX,
371 Z_EROFS_COMPRESSION_INTERLACED,
372 Z_EROFS_COMPRESSION_RUNTIME_MAX
373 };
374
375 struct erofs_map_dev {
376 struct super_block *m_sb;
377 struct erofs_device_info *m_dif;
378 struct block_device *m_bdev;
379
380 erofs_off_t m_pa;
381 unsigned int m_deviceid;
382 };
383
384 extern const struct super_operations erofs_sops;
385 extern const struct address_space_operations erofs_aops;
386 extern const struct address_space_operations erofs_fileio_aops;
387 extern const struct address_space_operations z_erofs_aops;
388
389 extern const struct inode_operations erofs_generic_iops;
390 extern const struct inode_operations erofs_symlink_iops;
391 extern const struct inode_operations erofs_fast_symlink_iops;
392 extern const struct inode_operations erofs_dir_iops;
393
394 extern const struct file_operations erofs_file_fops;
395 extern const struct file_operations erofs_dir_fops;
396 extern const struct file_operations erofs_ishare_fops;
397
398 extern const struct iomap_ops z_erofs_iomap_report_ops;
399
400 int erofs_setup_managed_cache(struct super_block *sb);
401 #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE
402 int erofs_read_meta_folio(struct file *file, struct folio *folio);
403 #else
404 #define erofs_read_meta_folio NULL
405 #endif
406 void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
407 erofs_off_t *offset, int *lengthp);
408 void erofs_unmap_metabuf(struct erofs_buf *buf);
409 void erofs_put_metabuf(struct erofs_buf *buf);
410 void *erofs_bread(struct erofs_buf *buf, erofs_off_t offset, bool need_kmap);
411 int erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb,
412 bool in_metabox);
413 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
414 erofs_off_t offset, bool in_metabox);
415 int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev);
416 int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
417 u64 start, u64 len);
418 int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map);
419 void erofs_onlinefolio_init(struct folio *folio);
420 void erofs_onlinefolio_split(struct folio *folio);
421 void erofs_onlinefolio_end(struct folio *folio, int err, bool dirty);
422 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid);
423 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
424 struct kstat *stat, u32 request_mask,
425 unsigned int query_flags);
426 int erofs_namei(struct inode *dir, const struct qstr *name,
427 erofs_nid_t *nid, unsigned int *d_type);
428
erofs_vm_map_ram(struct page ** pages,unsigned int count)429 static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count)
430 {
431 int retried = 0;
432
433 while (1) {
434 void *p = vm_map_ram(pages, count, -1);
435
436 /* retry two more times (totally 3 times) */
437 if (p || ++retried >= 3)
438 return p;
439 vm_unmap_aliases();
440 }
441 return NULL;
442 }
443
444 static inline const struct address_space_operations *
erofs_get_aops(struct inode * realinode)445 erofs_get_aops(struct inode *realinode)
446 {
447 if (erofs_inode_is_data_compressed(EROFS_I(realinode)->datalayout)) {
448 if (!IS_ENABLED(CONFIG_EROFS_FS_ZIP))
449 return ERR_PTR(-EOPNOTSUPP);
450 DO_ONCE_LITE_IF(realinode->i_blkbits != PAGE_SHIFT,
451 erofs_info, realinode->i_sb,
452 "EXPERIMENTAL EROFS subpage compressed block support in use. Use at your own risk!");
453 return &z_erofs_aops;
454 }
455 if (IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) &&
456 erofs_is_fileio_mode(EROFS_SB(realinode->i_sb)))
457 return &erofs_fileio_aops;
458 return &erofs_aops;
459 }
460
461 int erofs_register_sysfs(struct super_block *sb);
462 void erofs_unregister_sysfs(struct super_block *sb);
463 int __init erofs_init_sysfs(void);
464 void erofs_exit_sysfs(void);
465
466 struct page *__erofs_allocpage(struct page **pagepool, gfp_t gfp, bool tryrsv);
erofs_allocpage(struct page ** pagepool,gfp_t gfp)467 static inline struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp)
468 {
469 return __erofs_allocpage(pagepool, gfp, false);
470 }
erofs_pagepool_add(struct page ** pagepool,struct page * page)471 static inline void erofs_pagepool_add(struct page **pagepool, struct page *page)
472 {
473 set_page_private(page, (unsigned long)*pagepool);
474 *pagepool = page;
475 }
476 void erofs_release_pages(struct page **pagepool);
477
478 #ifdef CONFIG_EROFS_FS_ZIP
479 #define MNGD_MAPPING(sbi) ((sbi)->managed_cache->i_mapping)
480
481 extern atomic_long_t erofs_global_shrink_cnt;
482 void erofs_shrinker_register(struct super_block *sb);
483 void erofs_shrinker_unregister(struct super_block *sb);
484 int __init erofs_init_shrinker(void);
485 void erofs_exit_shrinker(void);
486 int __init z_erofs_init_subsystem(void);
487 void z_erofs_exit_subsystem(void);
488 int z_erofs_init_super(struct super_block *sb);
489 unsigned long z_erofs_shrink_scan(struct erofs_sb_info *sbi,
490 unsigned long nr_shrink);
491 int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
492 int flags);
493 void *z_erofs_get_gbuf(unsigned int requiredpages);
494 void z_erofs_put_gbuf(void *ptr);
495 int z_erofs_gbuf_growsize(unsigned int nrpages);
496 int __init z_erofs_gbuf_init(void);
497 void z_erofs_gbuf_exit(void);
498 #else
erofs_shrinker_register(struct super_block * sb)499 static inline void erofs_shrinker_register(struct super_block *sb) {}
erofs_shrinker_unregister(struct super_block * sb)500 static inline void erofs_shrinker_unregister(struct super_block *sb) {}
erofs_init_shrinker(void)501 static inline int erofs_init_shrinker(void) { return 0; }
erofs_exit_shrinker(void)502 static inline void erofs_exit_shrinker(void) {}
z_erofs_init_subsystem(void)503 static inline int z_erofs_init_subsystem(void) { return 0; }
z_erofs_exit_subsystem(void)504 static inline void z_erofs_exit_subsystem(void) {}
z_erofs_init_super(struct super_block * sb)505 static inline int z_erofs_init_super(struct super_block *sb) { return 0; }
506 #endif /* !CONFIG_EROFS_FS_ZIP */
507 int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb);
508
509 #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE
510 struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev);
511 void erofs_fileio_submit_bio(struct bio *bio);
512 #else
erofs_fileio_bio_alloc(struct erofs_map_dev * mdev)513 static inline struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev) { return NULL; }
erofs_fileio_submit_bio(struct bio * bio)514 static inline void erofs_fileio_submit_bio(struct bio *bio) {}
515 #endif
516
517 #ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE
518 int __init erofs_init_ishare(void);
519 void erofs_exit_ishare(void);
520 bool erofs_ishare_fill_inode(struct inode *inode);
521 void erofs_ishare_free_inode(struct inode *inode);
522 struct inode *erofs_real_inode(struct inode *inode, bool *need_iput);
523 #else
erofs_init_ishare(void)524 static inline int erofs_init_ishare(void) { return 0; }
erofs_exit_ishare(void)525 static inline void erofs_exit_ishare(void) {}
erofs_ishare_fill_inode(struct inode * inode)526 static inline bool erofs_ishare_fill_inode(struct inode *inode) { return false; }
erofs_ishare_free_inode(struct inode * inode)527 static inline void erofs_ishare_free_inode(struct inode *inode) {}
erofs_real_inode(struct inode * inode,bool * need_iput)528 static inline struct inode *erofs_real_inode(struct inode *inode, bool *need_iput)
529 {
530 *need_iput = false;
531 return inode;
532 }
533 #endif
534
535 long erofs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
536 long erofs_compat_ioctl(struct file *filp, unsigned int cmd,
537 unsigned long arg);
538
539 #endif /* __EROFS_INTERNAL_H */
540