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29b24f6c GX |
1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* | |
bfb8674d GX |
3 | * Copyright (C) 2017-2018 HUAWEI, Inc. |
4 | * http://www.huawei.com/ | |
5 | * Created by Gao Xiang <gaoxiang25@huawei.com> | |
bfb8674d | 6 | */ |
14f362b4 GX |
7 | #ifndef __EROFS_INTERNAL_H |
8 | #define __EROFS_INTERNAL_H | |
bfb8674d GX |
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> | |
47e4937a | 16 | #include <linux/magic.h> |
bfb8674d GX |
17 | #include <linux/slab.h> |
18 | #include <linux/vmalloc.h> | |
19 | #include "erofs_fs.h" | |
20 | ||
21 | /* redefine pr_fmt "erofs: " */ | |
22 | #undef pr_fmt | |
23 | #define pr_fmt(fmt) "erofs: " fmt | |
24 | ||
4f761fa2 GX |
25 | __printf(3, 4) void _erofs_err(struct super_block *sb, |
26 | const char *function, const char *fmt, ...); | |
27 | #define erofs_err(sb, fmt, ...) \ | |
28 | _erofs_err(sb, __func__, fmt "\n", ##__VA_ARGS__) | |
29 | __printf(3, 4) void _erofs_info(struct super_block *sb, | |
30 | const char *function, const char *fmt, ...); | |
31 | #define erofs_info(sb, fmt, ...) \ | |
32 | _erofs_info(sb, __func__, fmt "\n", ##__VA_ARGS__) | |
bfb8674d | 33 | #ifdef CONFIG_EROFS_FS_DEBUG |
4f761fa2 | 34 | #define erofs_dbg(x, ...) pr_debug(x "\n", ##__VA_ARGS__) |
bfb8674d GX |
35 | #define DBG_BUGON BUG_ON |
36 | #else | |
4f761fa2 | 37 | #define erofs_dbg(x, ...) ((void)0) |
eef16878 | 38 | #define DBG_BUGON(x) ((void)(x)) |
14f362b4 | 39 | #endif /* !CONFIG_EROFS_FS_DEBUG */ |
bfb8674d GX |
40 | |
41 | /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */ | |
42 | #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1 | |
43 | ||
44 | typedef u64 erofs_nid_t; | |
14f362b4 GX |
45 | typedef u64 erofs_off_t; |
46 | /* data type for filesystem-wide blocks number */ | |
47 | typedef u32 erofs_blk_t; | |
bfb8674d GX |
48 | |
49 | struct erofs_sb_info { | |
22fe04a7 | 50 | #ifdef CONFIG_EROFS_FS_ZIP |
2497ee41 GX |
51 | /* list for all registered superblocks, mainly for shrinker */ |
52 | struct list_head list; | |
a1581312 | 53 | struct mutex umount_mutex; |
2497ee41 | 54 | |
64094a04 GX |
55 | /* managed XArray arranged in physical block number */ |
56 | struct xarray managed_pslots; | |
105d4ad8 | 57 | |
5fb76bb0 GX |
58 | /* threshold for decompression synchronously */ |
59 | unsigned int max_sync_decompress_pages; | |
60 | ||
22fe04a7 GX |
61 | unsigned int shrinker_run_no; |
62 | ||
4279f3f9 GX |
63 | /* current strategy of how to use managed cache */ |
64 | unsigned char cache_strategy; | |
105d4ad8 | 65 | |
4279f3f9 GX |
66 | /* pseudo inode to manage cached pages */ |
67 | struct inode *managed_cache; | |
22fe04a7 GX |
68 | #endif /* CONFIG_EROFS_FS_ZIP */ |
69 | u32 blocks; | |
70 | u32 meta_blkaddr; | |
71 | #ifdef CONFIG_EROFS_FS_XATTR | |
72 | u32 xattr_blkaddr; | |
02827e17 | 73 | #endif |
bfb8674d | 74 | |
22fe04a7 GX |
75 | /* inode slot unit size in bit shift */ |
76 | unsigned char islotbits; | |
77 | ||
bfb8674d GX |
78 | u32 build_time_nsec; |
79 | u64 build_time; | |
80 | ||
81 | /* what we really care is nid, rather than ino.. */ | |
82 | erofs_nid_t root_nid; | |
83 | /* used for statfs, f_files - f_favail */ | |
84 | u64 inos; | |
85 | ||
86 | u8 uuid[16]; /* 128-bit uuid for volume */ | |
87 | u8 volume_name[16]; /* volume name */ | |
b858a484 | 88 | u32 feature_compat; |
426a9308 | 89 | u32 feature_incompat; |
5efe5137 | 90 | |
bfb8674d GX |
91 | unsigned int mount_opt; |
92 | }; | |
93 | ||
94 | #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) | |
95 | #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) | |
96 | ||
b17500a0 GX |
97 | /* Mount flags set via mount options or defaults */ |
98 | #define EROFS_MOUNT_XATTR_USER 0x00000010 | |
99 | #define EROFS_MOUNT_POSIX_ACL 0x00000020 | |
100 | ||
bfb8674d GX |
101 | #define clear_opt(sbi, option) ((sbi)->mount_opt &= ~EROFS_MOUNT_##option) |
102 | #define set_opt(sbi, option) ((sbi)->mount_opt |= EROFS_MOUNT_##option) | |
103 | #define test_opt(sbi, option) ((sbi)->mount_opt & EROFS_MOUNT_##option) | |
104 | ||
e7e9a307 | 105 | #ifdef CONFIG_EROFS_FS_ZIP |
4279f3f9 GX |
106 | enum { |
107 | EROFS_ZIP_CACHE_DISABLED, | |
108 | EROFS_ZIP_CACHE_READAHEAD, | |
109 | EROFS_ZIP_CACHE_READAROUND | |
110 | }; | |
111 | ||
14f362b4 GX |
112 | #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL) |
113 | ||
e7e9a307 GX |
114 | /* basic unit of the workstation of a super_block */ |
115 | struct erofs_workgroup { | |
116 | /* the workgroup index in the workstation */ | |
117 | pgoff_t index; | |
118 | ||
119 | /* overall workgroup reference count */ | |
120 | atomic_t refcount; | |
121 | }; | |
122 | ||
73f5c66d GX |
123 | #if defined(CONFIG_SMP) |
124 | static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, | |
125 | int val) | |
e7e9a307 | 126 | { |
e7e9a307 | 127 | preempt_disable(); |
73f5c66d | 128 | if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) { |
e7e9a307 GX |
129 | preempt_enable(); |
130 | return false; | |
131 | } | |
e7e9a307 GX |
132 | return true; |
133 | } | |
134 | ||
73f5c66d GX |
135 | static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, |
136 | int orig_val) | |
e7e9a307 | 137 | { |
948bbdb1 GX |
138 | /* |
139 | * other observers should notice all modifications | |
140 | * in the freezing period. | |
141 | */ | |
142 | smp_mb(); | |
73f5c66d | 143 | atomic_set(&grp->refcount, orig_val); |
e7e9a307 GX |
144 | preempt_enable(); |
145 | } | |
146 | ||
df134b8d GX |
147 | static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) |
148 | { | |
149 | return atomic_cond_read_relaxed(&grp->refcount, | |
150 | VAL != EROFS_LOCKED_MAGIC); | |
151 | } | |
152 | #else | |
73f5c66d GX |
153 | static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, |
154 | int val) | |
155 | { | |
156 | preempt_disable(); | |
157 | /* no need to spin on UP platforms, let's just disable preemption. */ | |
158 | if (val != atomic_read(&grp->refcount)) { | |
159 | preempt_enable(); | |
160 | return false; | |
161 | } | |
162 | return true; | |
163 | } | |
164 | ||
165 | static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, | |
166 | int orig_val) | |
167 | { | |
168 | preempt_enable(); | |
169 | } | |
170 | ||
df134b8d GX |
171 | static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) |
172 | { | |
173 | int v = atomic_read(&grp->refcount); | |
174 | ||
175 | /* workgroup is never freezed on uniprocessor systems */ | |
176 | DBG_BUGON(v == EROFS_LOCKED_MAGIC); | |
177 | return v; | |
178 | } | |
14f362b4 | 179 | #endif /* !CONFIG_SMP */ |
105d4ad8 | 180 | |
14f362b4 GX |
181 | /* hard limit of pages per compressed cluster */ |
182 | #define Z_EROFS_CLUSTER_MAX_PAGES (CONFIG_EROFS_FS_CLUSTER_PAGE_LIMIT) | |
183 | #define EROFS_PCPUBUF_NR_PAGES Z_EROFS_CLUSTER_MAX_PAGES | |
0a0b7e62 | 184 | #else |
14f362b4 | 185 | #define EROFS_PCPUBUF_NR_PAGES 0 |
14f362b4 | 186 | #endif /* !CONFIG_EROFS_FS_ZIP */ |
e7e9a307 | 187 | |
bfb8674d GX |
188 | /* we strictly follow PAGE_SIZE and no buffer head yet */ |
189 | #define LOG_BLOCK_SIZE PAGE_SHIFT | |
190 | ||
191 | #undef LOG_SECTORS_PER_BLOCK | |
192 | #define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) | |
193 | ||
194 | #undef SECTORS_PER_BLOCK | |
195 | #define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK) | |
196 | ||
197 | #define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE) | |
198 | ||
199 | #if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ) | |
200 | #error erofs cannot be used in this platform | |
201 | #endif | |
202 | ||
203 | #define ROOT_NID(sb) ((sb)->root_nid) | |
204 | ||
bfb8674d GX |
205 | #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) |
206 | #define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ) | |
207 | #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ) | |
208 | ||
209 | static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid) | |
210 | { | |
211 | return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits); | |
212 | } | |
213 | ||
62dc4597 | 214 | /* atomic flag definitions */ |
a5876e24 GX |
215 | #define EROFS_I_EA_INITED_BIT 0 |
216 | #define EROFS_I_Z_INITED_BIT 1 | |
62dc4597 GX |
217 | |
218 | /* bitlock definitions (arranged in reverse order) */ | |
a5876e24 GX |
219 | #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) |
220 | #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) | |
bfb8674d | 221 | |
a5876e24 | 222 | struct erofs_inode { |
bfb8674d | 223 | erofs_nid_t nid; |
62dc4597 GX |
224 | |
225 | /* atomic flags (including bitlocks) */ | |
226 | unsigned long flags; | |
bfb8674d | 227 | |
8a765682 | 228 | unsigned char datalayout; |
bfb8674d GX |
229 | unsigned char inode_isize; |
230 | unsigned short xattr_isize; | |
231 | ||
e82a9a17 PS |
232 | unsigned int xattr_shared_count; |
233 | unsigned int *xattr_shared_xattrs; | |
bfb8674d | 234 | |
152a333a GX |
235 | union { |
236 | erofs_blk_t raw_blkaddr; | |
237 | #ifdef CONFIG_EROFS_FS_ZIP | |
238 | struct { | |
239 | unsigned short z_advise; | |
240 | unsigned char z_algorithmtype[2]; | |
241 | unsigned char z_logical_clusterbits; | |
242 | unsigned char z_physical_clusterbits[2]; | |
243 | }; | |
14f362b4 | 244 | #endif /* CONFIG_EROFS_FS_ZIP */ |
152a333a | 245 | }; |
bfb8674d GX |
246 | /* the corresponding vfs inode */ |
247 | struct inode vfs_inode; | |
248 | }; | |
249 | ||
a5876e24 GX |
250 | #define EROFS_I(ptr) \ |
251 | container_of(ptr, struct erofs_inode, vfs_inode) | |
bfb8674d | 252 | |
99634bf3 | 253 | static inline unsigned long erofs_inode_datablocks(struct inode *inode) |
bfb8674d GX |
254 | { |
255 | /* since i_size cannot be changed */ | |
256 | return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ); | |
257 | } | |
258 | ||
8a765682 GX |
259 | static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit, |
260 | unsigned int bits) | |
261 | { | |
262 | ||
263 | return (value >> bit) & ((1 << bits) - 1); | |
264 | } | |
265 | ||
266 | ||
267 | static inline unsigned int erofs_inode_version(unsigned int value) | |
bfb8674d | 268 | { |
8a765682 GX |
269 | return erofs_bitrange(value, EROFS_I_VERSION_BIT, |
270 | EROFS_I_VERSION_BITS); | |
bfb8674d GX |
271 | } |
272 | ||
8a765682 | 273 | static inline unsigned int erofs_inode_datalayout(unsigned int value) |
bfb8674d | 274 | { |
8a765682 GX |
275 | return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT, |
276 | EROFS_I_DATALAYOUT_BITS); | |
bfb8674d GX |
277 | } |
278 | ||
279 | extern const struct super_operations erofs_sops; | |
bfb8674d GX |
280 | |
281 | extern const struct address_space_operations erofs_raw_access_aops; | |
0c638f70 | 282 | extern const struct address_space_operations z_erofs_aops; |
bfb8674d GX |
283 | |
284 | /* | |
285 | * Logical to physical block mapping, used by erofs_map_blocks() | |
286 | * | |
287 | * Different with other file systems, it is used for 2 access modes: | |
288 | * | |
289 | * 1) RAW access mode: | |
290 | * | |
291 | * Users pass a valid (m_lblk, m_lofs -- usually 0) pair, | |
292 | * and get the valid m_pblk, m_pofs and the longest m_len(in bytes). | |
293 | * | |
294 | * Note that m_lblk in the RAW access mode refers to the number of | |
295 | * the compressed ondisk block rather than the uncompressed | |
296 | * in-memory block for the compressed file. | |
297 | * | |
298 | * m_pofs equals to m_lofs except for the inline data page. | |
299 | * | |
300 | * 2) Normal access mode: | |
301 | * | |
302 | * If the inode is not compressed, it has no difference with | |
303 | * the RAW access mode. However, if the inode is compressed, | |
304 | * users should pass a valid (m_lblk, m_lofs) pair, and get | |
305 | * the needed m_pblk, m_pofs, m_len to get the compressed data | |
306 | * and the updated m_lblk, m_lofs which indicates the start | |
307 | * of the corresponding uncompressed data in the file. | |
308 | */ | |
309 | enum { | |
310 | BH_Zipped = BH_PrivateStart, | |
b6a76183 | 311 | BH_FullMapped, |
bfb8674d GX |
312 | }; |
313 | ||
314 | /* Has a disk mapping */ | |
315 | #define EROFS_MAP_MAPPED (1 << BH_Mapped) | |
316 | /* Located in metadata (could be copied from bd_inode) */ | |
317 | #define EROFS_MAP_META (1 << BH_Meta) | |
318 | /* The extent has been compressed */ | |
319 | #define EROFS_MAP_ZIPPED (1 << BH_Zipped) | |
b6a76183 GX |
320 | /* The length of extent is full */ |
321 | #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) | |
bfb8674d GX |
322 | |
323 | struct erofs_map_blocks { | |
324 | erofs_off_t m_pa, m_la; | |
325 | u64 m_plen, m_llen; | |
326 | ||
327 | unsigned int m_flags; | |
3b423417 CY |
328 | |
329 | struct page *mpage; | |
bfb8674d GX |
330 | }; |
331 | ||
332 | /* Flags used by erofs_map_blocks() */ | |
333 | #define EROFS_GET_BLOCKS_RAW 0x0001 | |
334 | ||
152a333a | 335 | /* zmap.c */ |
3b423417 | 336 | #ifdef CONFIG_EROFS_FS_ZIP |
152a333a | 337 | int z_erofs_fill_inode(struct inode *inode); |
3b423417 CY |
338 | int z_erofs_map_blocks_iter(struct inode *inode, |
339 | struct erofs_map_blocks *map, | |
340 | int flags); | |
341 | #else | |
ff784a78 | 342 | static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; } |
3b423417 CY |
343 | static inline int z_erofs_map_blocks_iter(struct inode *inode, |
344 | struct erofs_map_blocks *map, | |
345 | int flags) | |
346 | { | |
ff784a78 | 347 | return -EOPNOTSUPP; |
3b423417 | 348 | } |
14f362b4 | 349 | #endif /* !CONFIG_EROFS_FS_ZIP */ |
3b423417 | 350 | |
bfb8674d | 351 | /* data.c */ |
e655b5b3 | 352 | struct page *erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr); |
6e78901a | 353 | |
2e1d6637 | 354 | int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int); |
bfb8674d | 355 | |
bfb8674d | 356 | /* inode.c */ |
2abd7814 GX |
357 | static inline unsigned long erofs_inode_hash(erofs_nid_t nid) |
358 | { | |
359 | #if BITS_PER_LONG == 32 | |
360 | return (nid >> 32) ^ (nid & 0xffffffff); | |
361 | #else | |
362 | return nid; | |
363 | #endif | |
364 | } | |
365 | ||
60939826 GX |
366 | extern const struct inode_operations erofs_generic_iops; |
367 | extern const struct inode_operations erofs_symlink_iops; | |
368 | extern const struct inode_operations erofs_fast_symlink_iops; | |
b17500a0 | 369 | |
2e1d6637 | 370 | struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir); |
89f27ede GX |
371 | int erofs_getattr(const struct path *path, struct kstat *stat, |
372 | u32 request_mask, unsigned int query_flags); | |
2e1d6637 | 373 | |
60939826 GX |
374 | /* namei.c */ |
375 | extern const struct inode_operations erofs_dir_iops; | |
376 | ||
377 | int erofs_namei(struct inode *dir, struct qstr *name, | |
378 | erofs_nid_t *nid, unsigned int *d_type); | |
379 | ||
380 | /* dir.c */ | |
381 | extern const struct file_operations erofs_dir_fops; | |
382 | ||
14f362b4 | 383 | /* utils.c / zdata.c */ |
5ddcee1f | 384 | struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp); |
fa61a33f GX |
385 | |
386 | #if (EROFS_PCPUBUF_NR_PAGES > 0) | |
387 | void *erofs_get_pcpubuf(unsigned int pagenr); | |
388 | #define erofs_put_pcpubuf(buf) do { \ | |
389 | (void)&(buf); \ | |
390 | preempt_enable(); \ | |
391 | } while (0) | |
392 | #else | |
393 | static inline void *erofs_get_pcpubuf(unsigned int pagenr) | |
394 | { | |
ff784a78 | 395 | return ERR_PTR(-EOPNOTSUPP); |
fa61a33f GX |
396 | } |
397 | ||
398 | #define erofs_put_pcpubuf(buf) do {} while (0) | |
399 | #endif | |
400 | ||
22fe04a7 | 401 | #ifdef CONFIG_EROFS_FS_ZIP |
14f362b4 GX |
402 | int erofs_workgroup_put(struct erofs_workgroup *grp); |
403 | struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, | |
997626d8 | 404 | pgoff_t index); |
64094a04 GX |
405 | struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb, |
406 | struct erofs_workgroup *grp); | |
14f362b4 | 407 | void erofs_workgroup_free_rcu(struct erofs_workgroup *grp); |
22fe04a7 GX |
408 | void erofs_shrinker_register(struct super_block *sb); |
409 | void erofs_shrinker_unregister(struct super_block *sb); | |
410 | int __init erofs_init_shrinker(void); | |
411 | void erofs_exit_shrinker(void); | |
412 | int __init z_erofs_init_zip_subsystem(void); | |
413 | void z_erofs_exit_zip_subsystem(void); | |
14f362b4 GX |
414 | int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, |
415 | struct erofs_workgroup *egrp); | |
416 | int erofs_try_to_free_cached_page(struct address_space *mapping, | |
417 | struct page *page); | |
22fe04a7 GX |
418 | #else |
419 | static inline void erofs_shrinker_register(struct super_block *sb) {} | |
420 | static inline void erofs_shrinker_unregister(struct super_block *sb) {} | |
421 | static inline int erofs_init_shrinker(void) { return 0; } | |
422 | static inline void erofs_exit_shrinker(void) {} | |
423 | static inline int z_erofs_init_zip_subsystem(void) { return 0; } | |
424 | static inline void z_erofs_exit_zip_subsystem(void) {} | |
425 | #endif /* !CONFIG_EROFS_FS_ZIP */ | |
2e1d6637 | 426 | |
a6b9b1d5 GX |
427 | #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ |
428 | ||
14f362b4 | 429 | #endif /* __EROFS_INTERNAL_H */ |
bfb8674d | 430 |