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 /* redefine pr_fmt "erofs: " */ 24 #undef pr_fmt 25 #define pr_fmt(fmt) "erofs: " fmt 26 27 __printf(3, 4) void _erofs_err(struct super_block *sb, 28 const char *function, const char *fmt, ...); 29 #define erofs_err(sb, fmt, ...) \ 30 _erofs_err(sb, __func__, fmt "\n", ##__VA_ARGS__) 31 __printf(3, 4) void _erofs_info(struct super_block *sb, 32 const char *function, const char *fmt, ...); 33 #define erofs_info(sb, fmt, ...) \ 34 _erofs_info(sb, __func__, fmt "\n", ##__VA_ARGS__) 35 #ifdef CONFIG_EROFS_FS_DEBUG 36 #define DBG_BUGON BUG_ON 37 #else 38 #define DBG_BUGON(x) ((void)(x)) 39 #endif /* !CONFIG_EROFS_FS_DEBUG */ 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; 45 typedef u64 erofs_off_t; 46 /* data type for filesystem-wide blocks number */ 47 typedef u32 erofs_blk_t; 48 49 struct erofs_device_info { 50 char *path; 51 struct erofs_fscache *fscache; 52 struct bdev_handle *bdev_handle; 53 struct dax_device *dax_dev; 54 u64 dax_part_off; 55 56 u32 blocks; 57 u32 mapped_blkaddr; 58 }; 59 60 enum { 61 EROFS_SYNC_DECOMPRESS_AUTO, 62 EROFS_SYNC_DECOMPRESS_FORCE_ON, 63 EROFS_SYNC_DECOMPRESS_FORCE_OFF 64 }; 65 66 struct erofs_mount_opts { 67 #ifdef CONFIG_EROFS_FS_ZIP 68 /* current strategy of how to use managed cache */ 69 unsigned char cache_strategy; 70 /* strategy of sync decompression (0 - auto, 1 - force on, 2 - force off) */ 71 unsigned int sync_decompress; 72 73 /* threshold for decompression synchronously */ 74 unsigned int max_sync_decompress_pages; 75 #endif 76 unsigned int mount_opt; 77 }; 78 79 struct erofs_dev_context { 80 struct idr tree; 81 struct rw_semaphore rwsem; 82 83 unsigned int extra_devices; 84 bool flatdev; 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; /* anonymous inode for the blob */ 112 113 /* used for share domain mode */ 114 struct erofs_domain *domain; 115 struct list_head node; 116 refcount_t ref; 117 char *name; 118 }; 119 120 struct erofs_xattr_prefix_item { 121 struct erofs_xattr_long_prefix *prefix; 122 u8 infix_len; 123 }; 124 125 struct erofs_sb_info { 126 struct erofs_mount_opts opt; /* options */ 127 #ifdef CONFIG_EROFS_FS_ZIP 128 /* list for all registered superblocks, mainly for shrinker */ 129 struct list_head list; 130 struct mutex umount_mutex; 131 132 /* managed XArray arranged in physical block number */ 133 struct xarray managed_pslots; 134 135 unsigned int shrinker_run_no; 136 u16 available_compr_algs; 137 138 /* pseudo inode to manage cached pages */ 139 struct inode *managed_cache; 140 141 struct erofs_sb_lz4_info lz4; 142 #endif /* CONFIG_EROFS_FS_ZIP */ 143 struct inode *packed_inode; 144 struct erofs_dev_context *devs; 145 struct dax_device *dax_dev; 146 u64 dax_part_off; 147 u64 total_blocks; 148 u32 primarydevice_blocks; 149 150 u32 meta_blkaddr; 151 #ifdef CONFIG_EROFS_FS_XATTR 152 u32 xattr_blkaddr; 153 u32 xattr_prefix_start; 154 u8 xattr_prefix_count; 155 struct erofs_xattr_prefix_item *xattr_prefixes; 156 unsigned int xattr_filter_reserved; 157 #endif 158 u16 device_id_mask; /* valid bits of device id to be used */ 159 160 unsigned char islotbits; /* inode slot unit size in bit shift */ 161 unsigned char blkszbits; /* filesystem block size in bit shift */ 162 163 u32 sb_size; /* total superblock size */ 164 u32 build_time_nsec; 165 u64 build_time; 166 167 /* what we really care is nid, rather than ino.. */ 168 erofs_nid_t root_nid; 169 erofs_nid_t packed_nid; 170 /* used for statfs, f_files - f_favail */ 171 u64 inos; 172 173 u8 uuid[16]; /* 128-bit uuid for volume */ 174 u8 volume_name[16]; /* volume name */ 175 u32 feature_compat; 176 u32 feature_incompat; 177 178 /* sysfs support */ 179 struct kobject s_kobj; /* /sys/fs/erofs/<devname> */ 180 struct completion s_kobj_unregister; 181 182 /* fscache support */ 183 struct fscache_volume *volume; 184 struct erofs_fscache *s_fscache; 185 struct erofs_domain *domain; 186 char *fsid; 187 char *domain_id; 188 }; 189 190 #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) 191 #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) 192 193 /* Mount flags set via mount options or defaults */ 194 #define EROFS_MOUNT_XATTR_USER 0x00000010 195 #define EROFS_MOUNT_POSIX_ACL 0x00000020 196 #define EROFS_MOUNT_DAX_ALWAYS 0x00000040 197 #define EROFS_MOUNT_DAX_NEVER 0x00000080 198 199 #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option) 200 #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option) 201 #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option) 202 203 static inline bool erofs_is_fscache_mode(struct super_block *sb) 204 { 205 return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !sb->s_bdev; 206 } 207 208 enum { 209 EROFS_ZIP_CACHE_DISABLED, 210 EROFS_ZIP_CACHE_READAHEAD, 211 EROFS_ZIP_CACHE_READAROUND 212 }; 213 214 /* basic unit of the workstation of a super_block */ 215 struct erofs_workgroup { 216 pgoff_t index; 217 struct lockref lockref; 218 }; 219 220 enum erofs_kmap_type { 221 EROFS_NO_KMAP, /* don't map the buffer */ 222 EROFS_KMAP, /* use kmap_local_page() to map the buffer */ 223 }; 224 225 struct erofs_buf { 226 struct inode *inode; 227 struct page *page; 228 void *base; 229 enum erofs_kmap_type kmap_type; 230 }; 231 #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL }) 232 233 #define erofs_blknr(sb, addr) ((addr) >> (sb)->s_blocksize_bits) 234 #define erofs_blkoff(sb, addr) ((addr) & ((sb)->s_blocksize - 1)) 235 #define erofs_pos(sb, blk) ((erofs_off_t)(blk) << (sb)->s_blocksize_bits) 236 #define erofs_iblks(i) (round_up((i)->i_size, i_blocksize(i)) >> (i)->i_blkbits) 237 238 #define EROFS_FEATURE_FUNCS(name, compat, feature) \ 239 static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \ 240 { \ 241 return sbi->feature_##compat & EROFS_FEATURE_##feature; \ 242 } 243 244 EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING) 245 EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS) 246 EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER) 247 EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE) 248 EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE) 249 EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2) 250 EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING) 251 EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS) 252 EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE) 253 EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES) 254 EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) 255 EROFS_FEATURE_FUNCS(xattr_filter, compat, COMPAT_XATTR_FILTER) 256 257 /* atomic flag definitions */ 258 #define EROFS_I_EA_INITED_BIT 0 259 #define EROFS_I_Z_INITED_BIT 1 260 261 /* bitlock definitions (arranged in reverse order) */ 262 #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) 263 #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) 264 265 struct erofs_inode { 266 erofs_nid_t nid; 267 268 /* atomic flags (including bitlocks) */ 269 unsigned long flags; 270 271 unsigned char datalayout; 272 unsigned char inode_isize; 273 unsigned int xattr_isize; 274 275 unsigned int xattr_name_filter; 276 unsigned int xattr_shared_count; 277 unsigned int *xattr_shared_xattrs; 278 279 union { 280 erofs_blk_t raw_blkaddr; 281 struct { 282 unsigned short chunkformat; 283 unsigned char chunkbits; 284 }; 285 #ifdef CONFIG_EROFS_FS_ZIP 286 struct { 287 unsigned short z_advise; 288 unsigned char z_algorithmtype[2]; 289 unsigned char z_logical_clusterbits; 290 unsigned long z_tailextent_headlcn; 291 union { 292 struct { 293 erofs_off_t z_idataoff; 294 unsigned short z_idata_size; 295 }; 296 erofs_off_t z_fragmentoff; 297 }; 298 }; 299 #endif /* CONFIG_EROFS_FS_ZIP */ 300 }; 301 /* the corresponding vfs inode */ 302 struct inode vfs_inode; 303 }; 304 305 #define EROFS_I(ptr) container_of(ptr, struct erofs_inode, vfs_inode) 306 307 static inline erofs_off_t erofs_iloc(struct inode *inode) 308 { 309 struct erofs_sb_info *sbi = EROFS_I_SB(inode); 310 311 return erofs_pos(inode->i_sb, sbi->meta_blkaddr) + 312 (EROFS_I(inode)->nid << sbi->islotbits); 313 } 314 315 static inline unsigned int erofs_inode_version(unsigned int ifmt) 316 { 317 return (ifmt >> EROFS_I_VERSION_BIT) & EROFS_I_VERSION_MASK; 318 } 319 320 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 /* 326 * Different from grab_cache_page_nowait(), reclaiming is never triggered 327 * when allocating new pages. 328 */ 329 static inline 330 struct page *erofs_grab_cache_page_nowait(struct address_space *mapping, 331 pgoff_t index) 332 { 333 return pagecache_get_page(mapping, index, 334 FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT, 335 readahead_gfp_mask(mapping) & ~__GFP_RECLAIM); 336 } 337 338 /* Has a disk mapping */ 339 #define EROFS_MAP_MAPPED 0x0001 340 /* Located in metadata (could be copied from bd_inode) */ 341 #define EROFS_MAP_META 0x0002 342 /* The extent is encoded */ 343 #define EROFS_MAP_ENCODED 0x0004 344 /* The length of extent is full */ 345 #define EROFS_MAP_FULL_MAPPED 0x0008 346 /* Located in the special packed inode */ 347 #define EROFS_MAP_FRAGMENT 0x0010 348 /* The extent refers to partial decompressed data */ 349 #define EROFS_MAP_PARTIAL_REF 0x0020 350 351 struct erofs_map_blocks { 352 struct erofs_buf buf; 353 354 erofs_off_t m_pa, m_la; 355 u64 m_plen, m_llen; 356 357 unsigned short m_deviceid; 358 char m_algorithmformat; 359 unsigned int m_flags; 360 }; 361 362 /* 363 * Used to get the exact decompressed length, e.g. fiemap (consider lookback 364 * approach instead if possible since it's more metadata lightweight.) 365 */ 366 #define EROFS_GET_BLOCKS_FIEMAP 0x0001 367 /* Used to map the whole extent if non-negligible data is requested for LZMA */ 368 #define EROFS_GET_BLOCKS_READMORE 0x0002 369 /* Used to map tail extent for tailpacking inline or fragment pcluster */ 370 #define EROFS_GET_BLOCKS_FINDTAIL 0x0004 371 372 enum { 373 Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX, 374 Z_EROFS_COMPRESSION_INTERLACED, 375 Z_EROFS_COMPRESSION_RUNTIME_MAX 376 }; 377 378 struct erofs_map_dev { 379 struct erofs_fscache *m_fscache; 380 struct block_device *m_bdev; 381 struct dax_device *m_daxdev; 382 u64 m_dax_part_off; 383 384 erofs_off_t m_pa; 385 unsigned int m_deviceid; 386 }; 387 388 extern struct file_system_type erofs_fs_type; 389 extern const struct super_operations erofs_sops; 390 391 extern const struct address_space_operations erofs_raw_access_aops; 392 extern const struct address_space_operations z_erofs_aops; 393 extern const struct address_space_operations erofs_fscache_access_aops; 394 395 extern const struct inode_operations erofs_generic_iops; 396 extern const struct inode_operations erofs_symlink_iops; 397 extern const struct inode_operations erofs_fast_symlink_iops; 398 extern const struct inode_operations erofs_dir_iops; 399 400 extern const struct file_operations erofs_file_fops; 401 extern const struct file_operations erofs_dir_fops; 402 403 extern const struct iomap_ops z_erofs_iomap_report_ops; 404 405 /* flags for erofs_fscache_register_cookie() */ 406 #define EROFS_REG_COOKIE_SHARE 0x0001 407 #define EROFS_REG_COOKIE_NEED_NOEXIST 0x0002 408 409 void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf, 410 erofs_off_t *offset, int *lengthp); 411 void erofs_unmap_metabuf(struct erofs_buf *buf); 412 void erofs_put_metabuf(struct erofs_buf *buf); 413 void *erofs_bread(struct erofs_buf *buf, erofs_blk_t blkaddr, 414 enum erofs_kmap_type type); 415 void erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb); 416 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb, 417 erofs_blk_t blkaddr, enum erofs_kmap_type type); 418 int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev); 419 int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 420 u64 start, u64 len); 421 int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map); 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); 428 429 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 int erofs_register_sysfs(struct super_block *sb); 445 void erofs_unregister_sysfs(struct super_block *sb); 446 int __init erofs_init_sysfs(void); 447 void erofs_exit_sysfs(void); 448 449 struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp); 450 static inline void erofs_pagepool_add(struct page **pagepool, struct page *page) 451 { 452 set_page_private(page, (unsigned long)*pagepool); 453 *pagepool = page; 454 } 455 void erofs_release_pages(struct page **pagepool); 456 457 #ifdef CONFIG_EROFS_FS_ZIP 458 void erofs_workgroup_put(struct erofs_workgroup *grp); 459 struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, 460 pgoff_t index); 461 struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb, 462 struct erofs_workgroup *grp); 463 void erofs_workgroup_free_rcu(struct erofs_workgroup *grp); 464 void erofs_shrinker_register(struct super_block *sb); 465 void erofs_shrinker_unregister(struct super_block *sb); 466 int __init erofs_init_shrinker(void); 467 void erofs_exit_shrinker(void); 468 int __init z_erofs_init_zip_subsystem(void); 469 void z_erofs_exit_zip_subsystem(void); 470 int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 471 struct erofs_workgroup *egrp); 472 int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map, 473 int flags); 474 void *erofs_get_pcpubuf(unsigned int requiredpages); 475 void erofs_put_pcpubuf(void *ptr); 476 int erofs_pcpubuf_growsize(unsigned int nrpages); 477 void __init erofs_pcpubuf_init(void); 478 void erofs_pcpubuf_exit(void); 479 int erofs_init_managed_cache(struct super_block *sb); 480 int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb); 481 #else 482 static inline void erofs_shrinker_register(struct super_block *sb) {} 483 static inline void erofs_shrinker_unregister(struct super_block *sb) {} 484 static inline int erofs_init_shrinker(void) { return 0; } 485 static inline void erofs_exit_shrinker(void) {} 486 static inline int z_erofs_init_zip_subsystem(void) { return 0; } 487 static inline void z_erofs_exit_zip_subsystem(void) {} 488 static inline void erofs_pcpubuf_init(void) {} 489 static inline void erofs_pcpubuf_exit(void) {} 490 static inline int erofs_init_managed_cache(struct super_block *sb) { return 0; } 491 #endif /* !CONFIG_EROFS_FS_ZIP */ 492 493 #ifdef CONFIG_EROFS_FS_ZIP_LZMA 494 int __init z_erofs_lzma_init(void); 495 void z_erofs_lzma_exit(void); 496 #else 497 static inline int z_erofs_lzma_init(void) { return 0; } 498 static inline int z_erofs_lzma_exit(void) { return 0; } 499 #endif /* !CONFIG_EROFS_FS_ZIP_LZMA */ 500 501 #ifdef CONFIG_EROFS_FS_ZIP_DEFLATE 502 int __init z_erofs_deflate_init(void); 503 void z_erofs_deflate_exit(void); 504 #else 505 static inline int z_erofs_deflate_init(void) { return 0; } 506 static inline int z_erofs_deflate_exit(void) { return 0; } 507 #endif /* !CONFIG_EROFS_FS_ZIP_DEFLATE */ 508 509 #ifdef CONFIG_EROFS_FS_ONDEMAND 510 int erofs_fscache_register_fs(struct super_block *sb); 511 void erofs_fscache_unregister_fs(struct super_block *sb); 512 513 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, 514 char *name, unsigned int flags); 515 void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache); 516 #else 517 static inline int erofs_fscache_register_fs(struct super_block *sb) 518 { 519 return -EOPNOTSUPP; 520 } 521 static inline void erofs_fscache_unregister_fs(struct super_block *sb) {} 522 523 static inline 524 struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, 525 char *name, unsigned int flags) 526 { 527 return ERR_PTR(-EOPNOTSUPP); 528 } 529 530 static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache) 531 { 532 } 533 #endif 534 535 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 536 537 #endif /* __EROFS_INTERNAL_H */ 538