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 /* strategy of sync decompression (0 - auto, 1 - force on, 2 - force off) */ 63 unsigned int sync_decompress; 64 /* threshold for decompression synchronously */ 65 unsigned int max_sync_decompress_pages; 66 unsigned int mount_opt; 67 }; 68 69 struct erofs_dev_context { 70 struct idr tree; 71 struct rw_semaphore rwsem; 72 73 unsigned int extra_devices; 74 bool flatdev; 75 }; 76 77 /* all filesystem-wide lz4 configurations */ 78 struct erofs_sb_lz4_info { 79 /* # of pages needed for EROFS lz4 rolling decompression */ 80 u16 max_distance_pages; 81 /* maximum possible blocks for pclusters in the filesystem */ 82 u16 max_pclusterblks; 83 }; 84 85 struct erofs_domain { 86 refcount_t ref; 87 struct list_head list; 88 struct fscache_volume *volume; 89 char *domain_id; 90 }; 91 92 struct erofs_fscache { 93 struct fscache_cookie *cookie; 94 struct inode *inode; /* anonymous inode for the blob */ 95 96 /* used for share domain mode */ 97 struct erofs_domain *domain; 98 struct list_head node; 99 refcount_t ref; 100 char *name; 101 }; 102 103 struct erofs_xattr_prefix_item { 104 struct erofs_xattr_long_prefix *prefix; 105 u8 infix_len; 106 }; 107 108 struct erofs_sb_info { 109 struct erofs_device_info dif0; 110 struct erofs_mount_opts opt; /* options */ 111 #ifdef CONFIG_EROFS_FS_ZIP 112 /* list for all registered superblocks, mainly for shrinker */ 113 struct list_head list; 114 struct mutex umount_mutex; 115 116 /* managed XArray arranged in physical block number */ 117 struct xarray managed_pslots; 118 119 unsigned int shrinker_run_no; 120 u16 available_compr_algs; 121 122 /* pseudo inode to manage cached pages */ 123 struct inode *managed_cache; 124 125 struct erofs_sb_lz4_info lz4; 126 #endif /* CONFIG_EROFS_FS_ZIP */ 127 struct inode *packed_inode; 128 struct erofs_dev_context *devs; 129 u64 total_blocks; 130 131 u32 meta_blkaddr; 132 #ifdef CONFIG_EROFS_FS_XATTR 133 u32 xattr_blkaddr; 134 u32 xattr_prefix_start; 135 u8 xattr_prefix_count; 136 struct erofs_xattr_prefix_item *xattr_prefixes; 137 unsigned int xattr_filter_reserved; 138 #endif 139 u16 device_id_mask; /* valid bits of device id to be used */ 140 141 unsigned char islotbits; /* inode slot unit size in bit shift */ 142 unsigned char blkszbits; /* filesystem block size in bit shift */ 143 144 u32 sb_size; /* total superblock size */ 145 u32 fixed_nsec; 146 s64 epoch; 147 148 /* what we really care is nid, rather than ino.. */ 149 erofs_nid_t root_nid; 150 erofs_nid_t packed_nid; 151 /* used for statfs, f_files - f_favail */ 152 u64 inos; 153 154 u32 feature_compat; 155 u32 feature_incompat; 156 157 /* sysfs support */ 158 struct kobject s_kobj; /* /sys/fs/erofs/<devname> */ 159 struct completion s_kobj_unregister; 160 161 /* fscache support */ 162 struct fscache_volume *volume; 163 struct erofs_domain *domain; 164 char *fsid; 165 char *domain_id; 166 }; 167 168 #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) 169 #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) 170 171 /* Mount flags set via mount options or defaults */ 172 #define EROFS_MOUNT_XATTR_USER 0x00000010 173 #define EROFS_MOUNT_POSIX_ACL 0x00000020 174 #define EROFS_MOUNT_DAX_ALWAYS 0x00000040 175 #define EROFS_MOUNT_DAX_NEVER 0x00000080 176 #define EROFS_MOUNT_DIRECT_IO 0x00000100 177 178 #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option) 179 #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option) 180 #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option) 181 182 static inline bool erofs_is_fileio_mode(struct erofs_sb_info *sbi) 183 { 184 return IS_ENABLED(CONFIG_EROFS_FS_BACKED_BY_FILE) && sbi->dif0.file; 185 } 186 187 static inline bool erofs_is_fscache_mode(struct super_block *sb) 188 { 189 return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && 190 !erofs_is_fileio_mode(EROFS_SB(sb)) && !sb->s_bdev; 191 } 192 193 enum { 194 EROFS_ZIP_CACHE_DISABLED, 195 EROFS_ZIP_CACHE_READAHEAD, 196 EROFS_ZIP_CACHE_READAROUND 197 }; 198 199 struct erofs_buf { 200 struct address_space *mapping; 201 struct file *file; 202 u64 off; 203 struct page *page; 204 void *base; 205 }; 206 #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL }) 207 208 #define erofs_blknr(sb, pos) ((erofs_blk_t)((pos) >> (sb)->s_blocksize_bits)) 209 #define erofs_blkoff(sb, pos) ((pos) & ((sb)->s_blocksize - 1)) 210 #define erofs_pos(sb, blk) ((erofs_off_t)(blk) << (sb)->s_blocksize_bits) 211 #define erofs_iblks(i) (round_up((i)->i_size, i_blocksize(i)) >> (i)->i_blkbits) 212 213 #define EROFS_FEATURE_FUNCS(name, compat, feature) \ 214 static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \ 215 { \ 216 return sbi->feature_##compat & EROFS_FEATURE_##feature; \ 217 } 218 219 EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING) 220 EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS) 221 EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER) 222 EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE) 223 EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE) 224 EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2) 225 EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING) 226 EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS) 227 EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE) 228 EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES) 229 EROFS_FEATURE_FUNCS(48bit, incompat, INCOMPAT_48BIT) 230 EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) 231 EROFS_FEATURE_FUNCS(xattr_filter, compat, COMPAT_XATTR_FILTER) 232 233 /* atomic flag definitions */ 234 #define EROFS_I_EA_INITED_BIT 0 235 #define EROFS_I_Z_INITED_BIT 1 236 237 /* bitlock definitions (arranged in reverse order) */ 238 #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) 239 #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) 240 241 struct erofs_inode { 242 erofs_nid_t nid; 243 244 /* atomic flags (including bitlocks) */ 245 unsigned long flags; 246 247 unsigned char datalayout; 248 unsigned char inode_isize; 249 bool dot_omitted; 250 unsigned int xattr_isize; 251 252 unsigned int xattr_name_filter; 253 unsigned int xattr_shared_count; 254 unsigned int *xattr_shared_xattrs; 255 256 union { 257 erofs_blk_t startblk; 258 struct { 259 unsigned short chunkformat; 260 unsigned char chunkbits; 261 }; 262 #ifdef CONFIG_EROFS_FS_ZIP 263 struct { 264 unsigned short z_advise; 265 unsigned char z_algorithmtype[2]; 266 unsigned char z_lclusterbits; 267 union { 268 u64 z_tailextent_headlcn; 269 u64 z_extents; 270 }; 271 erofs_off_t z_fragmentoff; 272 unsigned short z_idata_size; 273 }; 274 #endif /* CONFIG_EROFS_FS_ZIP */ 275 }; 276 /* the corresponding vfs inode */ 277 struct inode vfs_inode; 278 }; 279 280 #define EROFS_I(ptr) container_of(ptr, struct erofs_inode, vfs_inode) 281 282 static inline erofs_off_t erofs_iloc(struct inode *inode) 283 { 284 struct erofs_sb_info *sbi = EROFS_I_SB(inode); 285 286 return erofs_pos(inode->i_sb, sbi->meta_blkaddr) + 287 (EROFS_I(inode)->nid << sbi->islotbits); 288 } 289 290 static inline unsigned int erofs_inode_version(unsigned int ifmt) 291 { 292 return (ifmt >> EROFS_I_VERSION_BIT) & EROFS_I_VERSION_MASK; 293 } 294 295 static inline unsigned int erofs_inode_datalayout(unsigned int ifmt) 296 { 297 return (ifmt >> EROFS_I_DATALAYOUT_BIT) & EROFS_I_DATALAYOUT_MASK; 298 } 299 300 /* reclaiming is never triggered when allocating new folios. */ 301 static inline struct folio *erofs_grab_folio_nowait(struct address_space *as, 302 pgoff_t index) 303 { 304 return __filemap_get_folio(as, index, 305 FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT, 306 readahead_gfp_mask(as) & ~__GFP_RECLAIM); 307 } 308 309 /* Has a disk mapping */ 310 #define EROFS_MAP_MAPPED 0x0001 311 /* Located in metadata (could be copied from bd_inode) */ 312 #define EROFS_MAP_META 0x0002 313 /* The extent is encoded */ 314 #define EROFS_MAP_ENCODED 0x0004 315 /* The length of extent is full */ 316 #define EROFS_MAP_FULL_MAPPED 0x0008 317 /* Located in the special packed inode */ 318 #define EROFS_MAP_FRAGMENT 0x0010 319 /* The extent refers to partial decompressed data */ 320 #define EROFS_MAP_PARTIAL_REF 0x0020 321 322 struct erofs_map_blocks { 323 struct erofs_buf buf; 324 325 erofs_off_t m_pa, m_la; 326 u64 m_plen, m_llen; 327 328 unsigned short m_deviceid; 329 char m_algorithmformat; 330 unsigned int m_flags; 331 }; 332 333 /* 334 * Used to get the exact decompressed length, e.g. fiemap (consider lookback 335 * approach instead if possible since it's more metadata lightweight.) 336 */ 337 #define EROFS_GET_BLOCKS_FIEMAP 0x0001 338 /* Used to map the whole extent if non-negligible data is requested for LZMA */ 339 #define EROFS_GET_BLOCKS_READMORE 0x0002 340 /* Used to map tail extent for tailpacking inline or fragment pcluster */ 341 #define EROFS_GET_BLOCKS_FINDTAIL 0x0004 342 343 enum { 344 Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX, 345 Z_EROFS_COMPRESSION_INTERLACED, 346 Z_EROFS_COMPRESSION_RUNTIME_MAX 347 }; 348 349 struct erofs_map_dev { 350 struct super_block *m_sb; 351 struct erofs_device_info *m_dif; 352 struct block_device *m_bdev; 353 354 erofs_off_t m_pa; 355 unsigned int m_deviceid; 356 }; 357 358 extern const struct super_operations erofs_sops; 359 360 extern const struct address_space_operations erofs_aops; 361 extern const struct address_space_operations erofs_fileio_aops; 362 extern const struct address_space_operations z_erofs_aops; 363 extern const struct address_space_operations erofs_fscache_access_aops; 364 365 extern const struct inode_operations erofs_generic_iops; 366 extern const struct inode_operations erofs_symlink_iops; 367 extern const struct inode_operations erofs_fast_symlink_iops; 368 extern const struct inode_operations erofs_dir_iops; 369 370 extern const struct file_operations erofs_file_fops; 371 extern const struct file_operations erofs_dir_fops; 372 373 extern const struct iomap_ops z_erofs_iomap_report_ops; 374 375 /* flags for erofs_fscache_register_cookie() */ 376 #define EROFS_REG_COOKIE_SHARE 0x0001 377 #define EROFS_REG_COOKIE_NEED_NOEXIST 0x0002 378 379 void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf, 380 erofs_off_t *offset, int *lengthp); 381 void erofs_unmap_metabuf(struct erofs_buf *buf); 382 void erofs_put_metabuf(struct erofs_buf *buf); 383 void *erofs_bread(struct erofs_buf *buf, erofs_off_t offset, bool need_kmap); 384 void erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb); 385 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb, 386 erofs_off_t offset, bool need_kmap); 387 int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev); 388 int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 389 u64 start, u64 len); 390 int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map); 391 void erofs_onlinefolio_init(struct folio *folio); 392 void erofs_onlinefolio_split(struct folio *folio); 393 void erofs_onlinefolio_end(struct folio *folio, int err); 394 struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid); 395 int erofs_getattr(struct mnt_idmap *idmap, const struct path *path, 396 struct kstat *stat, u32 request_mask, 397 unsigned int query_flags); 398 int erofs_namei(struct inode *dir, const struct qstr *name, 399 erofs_nid_t *nid, unsigned int *d_type); 400 401 static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count) 402 { 403 int retried = 0; 404 405 while (1) { 406 void *p = vm_map_ram(pages, count, -1); 407 408 /* retry two more times (totally 3 times) */ 409 if (p || ++retried >= 3) 410 return p; 411 vm_unmap_aliases(); 412 } 413 return NULL; 414 } 415 416 int erofs_register_sysfs(struct super_block *sb); 417 void erofs_unregister_sysfs(struct super_block *sb); 418 int __init erofs_init_sysfs(void); 419 void erofs_exit_sysfs(void); 420 421 struct page *__erofs_allocpage(struct page **pagepool, gfp_t gfp, bool tryrsv); 422 static inline struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp) 423 { 424 return __erofs_allocpage(pagepool, gfp, false); 425 } 426 static inline void erofs_pagepool_add(struct page **pagepool, struct page *page) 427 { 428 set_page_private(page, (unsigned long)*pagepool); 429 *pagepool = page; 430 } 431 void erofs_release_pages(struct page **pagepool); 432 433 #ifdef CONFIG_EROFS_FS_ZIP 434 #define MNGD_MAPPING(sbi) ((sbi)->managed_cache->i_mapping) 435 436 extern atomic_long_t erofs_global_shrink_cnt; 437 void erofs_shrinker_register(struct super_block *sb); 438 void erofs_shrinker_unregister(struct super_block *sb); 439 int __init erofs_init_shrinker(void); 440 void erofs_exit_shrinker(void); 441 int __init z_erofs_init_subsystem(void); 442 void z_erofs_exit_subsystem(void); 443 int z_erofs_init_super(struct super_block *sb); 444 unsigned long z_erofs_shrink_scan(struct erofs_sb_info *sbi, 445 unsigned long nr_shrink); 446 int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map, 447 int flags); 448 void *z_erofs_get_gbuf(unsigned int requiredpages); 449 void z_erofs_put_gbuf(void *ptr); 450 int z_erofs_gbuf_growsize(unsigned int nrpages); 451 int __init z_erofs_gbuf_init(void); 452 void z_erofs_gbuf_exit(void); 453 int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb); 454 #else 455 static inline void erofs_shrinker_register(struct super_block *sb) {} 456 static inline void erofs_shrinker_unregister(struct super_block *sb) {} 457 static inline int erofs_init_shrinker(void) { return 0; } 458 static inline void erofs_exit_shrinker(void) {} 459 static inline int z_erofs_init_subsystem(void) { return 0; } 460 static inline void z_erofs_exit_subsystem(void) {} 461 static inline int z_erofs_init_super(struct super_block *sb) { return 0; } 462 #endif /* !CONFIG_EROFS_FS_ZIP */ 463 464 #ifdef CONFIG_EROFS_FS_BACKED_BY_FILE 465 struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev); 466 void erofs_fileio_submit_bio(struct bio *bio); 467 #else 468 static inline struct bio *erofs_fileio_bio_alloc(struct erofs_map_dev *mdev) { return NULL; } 469 static inline void erofs_fileio_submit_bio(struct bio *bio) {} 470 #endif 471 472 #ifdef CONFIG_EROFS_FS_ONDEMAND 473 int erofs_fscache_register_fs(struct super_block *sb); 474 void erofs_fscache_unregister_fs(struct super_block *sb); 475 476 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, 477 char *name, unsigned int flags); 478 void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache); 479 struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev); 480 void erofs_fscache_submit_bio(struct bio *bio); 481 #else 482 static inline int erofs_fscache_register_fs(struct super_block *sb) 483 { 484 return -EOPNOTSUPP; 485 } 486 static inline void erofs_fscache_unregister_fs(struct super_block *sb) {} 487 488 static inline 489 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, 490 char *name, unsigned int flags) 491 { 492 return ERR_PTR(-EOPNOTSUPP); 493 } 494 495 static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache) 496 { 497 } 498 static inline struct bio *erofs_fscache_bio_alloc(struct erofs_map_dev *mdev) { return NULL; } 499 static inline void erofs_fscache_submit_bio(struct bio *bio) {} 500 #endif 501 502 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 503 504 #endif /* __EROFS_INTERNAL_H */ 505