/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2017-2018 HUAWEI, Inc. * https://www.huawei.com/ * Copyright (C) 2021, Alibaba Cloud */ #ifndef __EROFS_INTERNAL_H #define __EROFS_INTERNAL_H #include #include #include #include #include #include #include #include #include #include #include "erofs_fs.h" /* redefine pr_fmt "erofs: " */ #undef pr_fmt #define pr_fmt(fmt) "erofs: " fmt __printf(3, 4) void _erofs_err(struct super_block *sb, const char *function, const char *fmt, ...); #define erofs_err(sb, fmt, ...) \ _erofs_err(sb, __func__, fmt "\n", ##__VA_ARGS__) __printf(3, 4) void _erofs_info(struct super_block *sb, const char *function, const char *fmt, ...); #define erofs_info(sb, fmt, ...) \ _erofs_info(sb, __func__, fmt "\n", ##__VA_ARGS__) #ifdef CONFIG_EROFS_FS_DEBUG #define erofs_dbg(x, ...) pr_debug(x "\n", ##__VA_ARGS__) #define DBG_BUGON BUG_ON #else #define erofs_dbg(x, ...) ((void)0) #define DBG_BUGON(x) ((void)(x)) #endif /* !CONFIG_EROFS_FS_DEBUG */ /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */ #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1 typedef u64 erofs_nid_t; typedef u64 erofs_off_t; /* data type for filesystem-wide blocks number */ typedef u32 erofs_blk_t; struct erofs_device_info { char *path; struct erofs_fscache *fscache; struct block_device *bdev; struct dax_device *dax_dev; u64 dax_part_off; u32 blocks; u32 mapped_blkaddr; }; enum { EROFS_SYNC_DECOMPRESS_AUTO, EROFS_SYNC_DECOMPRESS_FORCE_ON, EROFS_SYNC_DECOMPRESS_FORCE_OFF }; struct erofs_mount_opts { #ifdef CONFIG_EROFS_FS_ZIP /* current strategy of how to use managed cache */ unsigned char cache_strategy; /* strategy of sync decompression (0 - auto, 1 - force on, 2 - force off) */ unsigned int sync_decompress; /* threshold for decompression synchronously */ unsigned int max_sync_decompress_pages; #endif unsigned int mount_opt; }; struct erofs_dev_context { struct idr tree; struct rw_semaphore rwsem; unsigned int extra_devices; }; struct erofs_fs_context { struct erofs_mount_opts opt; struct erofs_dev_context *devs; char *fsid; char *domain_id; }; /* all filesystem-wide lz4 configurations */ struct erofs_sb_lz4_info { /* # of pages needed for EROFS lz4 rolling decompression */ u16 max_distance_pages; /* maximum possible blocks for pclusters in the filesystem */ u16 max_pclusterblks; }; struct erofs_domain { refcount_t ref; struct list_head list; struct fscache_volume *volume; char *domain_id; }; struct erofs_fscache { struct fscache_cookie *cookie; struct inode *inode; struct inode *anon_inode; struct erofs_domain *domain; char *name; }; struct erofs_sb_info { struct erofs_mount_opts opt; /* options */ #ifdef CONFIG_EROFS_FS_ZIP /* list for all registered superblocks, mainly for shrinker */ struct list_head list; struct mutex umount_mutex; /* managed XArray arranged in physical block number */ struct xarray managed_pslots; unsigned int shrinker_run_no; u16 available_compr_algs; /* pseudo inode to manage cached pages */ struct inode *managed_cache; struct erofs_sb_lz4_info lz4; struct inode *packed_inode; #endif /* CONFIG_EROFS_FS_ZIP */ struct erofs_dev_context *devs; struct dax_device *dax_dev; u64 dax_part_off; u64 total_blocks; u32 primarydevice_blocks; u32 meta_blkaddr; #ifdef CONFIG_EROFS_FS_XATTR u32 xattr_blkaddr; #endif u16 device_id_mask; /* valid bits of device id to be used */ /* inode slot unit size in bit shift */ unsigned char islotbits; u32 sb_size; /* total superblock size */ u32 build_time_nsec; u64 build_time; /* what we really care is nid, rather than ino.. */ erofs_nid_t root_nid; erofs_nid_t packed_nid; /* used for statfs, f_files - f_favail */ u64 inos; u8 uuid[16]; /* 128-bit uuid for volume */ u8 volume_name[16]; /* volume name */ u32 feature_compat; u32 feature_incompat; /* sysfs support */ struct kobject s_kobj; /* /sys/fs/erofs/ */ struct completion s_kobj_unregister; /* fscache support */ struct fscache_volume *volume; struct erofs_fscache *s_fscache; struct erofs_domain *domain; char *fsid; char *domain_id; }; #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) /* Mount flags set via mount options or defaults */ #define EROFS_MOUNT_XATTR_USER 0x00000010 #define EROFS_MOUNT_POSIX_ACL 0x00000020 #define EROFS_MOUNT_DAX_ALWAYS 0x00000040 #define EROFS_MOUNT_DAX_NEVER 0x00000080 #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option) #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option) #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option) static inline bool erofs_is_fscache_mode(struct super_block *sb) { return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !sb->s_bdev; } enum { EROFS_ZIP_CACHE_DISABLED, EROFS_ZIP_CACHE_READAHEAD, EROFS_ZIP_CACHE_READAROUND }; #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL) /* basic unit of the workstation of a super_block */ struct erofs_workgroup { /* the workgroup index in the workstation */ pgoff_t index; /* overall workgroup reference count */ atomic_t refcount; }; static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, int val) { preempt_disable(); if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) { preempt_enable(); return false; } return true; } static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, int orig_val) { /* * other observers should notice all modifications * in the freezing period. */ smp_mb(); atomic_set(&grp->refcount, orig_val); preempt_enable(); } static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) { return atomic_cond_read_relaxed(&grp->refcount, VAL != EROFS_LOCKED_MAGIC); } /* we strictly follow PAGE_SIZE and no buffer head yet */ #define LOG_BLOCK_SIZE PAGE_SHIFT #undef LOG_SECTORS_PER_BLOCK #define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) #undef SECTORS_PER_BLOCK #define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK) #define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE) #if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ) #error erofs cannot be used in this platform #endif enum erofs_kmap_type { EROFS_NO_KMAP, /* don't map the buffer */ EROFS_KMAP, /* use kmap() to map the buffer */ EROFS_KMAP_ATOMIC, /* use kmap_atomic() to map the buffer */ }; struct erofs_buf { struct page *page; void *base; enum erofs_kmap_type kmap_type; }; #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL }) #define ROOT_NID(sb) ((sb)->root_nid) #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) #define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ) #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ) static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid) { return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits); } #define EROFS_FEATURE_FUNCS(name, compat, feature) \ static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \ { \ return sbi->feature_##compat & EROFS_FEATURE_##feature; \ } EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING) EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS) EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER) EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE) EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE) EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2) EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING) EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS) EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE) EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) /* atomic flag definitions */ #define EROFS_I_EA_INITED_BIT 0 #define EROFS_I_Z_INITED_BIT 1 /* bitlock definitions (arranged in reverse order) */ #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) struct erofs_inode { erofs_nid_t nid; /* atomic flags (including bitlocks) */ unsigned long flags; unsigned char datalayout; unsigned char inode_isize; unsigned int xattr_isize; unsigned int xattr_shared_count; unsigned int *xattr_shared_xattrs; union { erofs_blk_t raw_blkaddr; struct { unsigned short chunkformat; unsigned char chunkbits; }; #ifdef CONFIG_EROFS_FS_ZIP struct { unsigned short z_advise; unsigned char z_algorithmtype[2]; unsigned char z_logical_clusterbits; unsigned long z_tailextent_headlcn; union { struct { erofs_off_t z_idataoff; unsigned short z_idata_size; }; erofs_off_t z_fragmentoff; }; }; #endif /* CONFIG_EROFS_FS_ZIP */ }; /* the corresponding vfs inode */ struct inode vfs_inode; }; #define EROFS_I(ptr) \ container_of(ptr, struct erofs_inode, vfs_inode) static inline unsigned long erofs_inode_datablocks(struct inode *inode) { /* since i_size cannot be changed */ return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ); } static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit, unsigned int bits) { return (value >> bit) & ((1 << bits) - 1); } static inline unsigned int erofs_inode_version(unsigned int value) { return erofs_bitrange(value, EROFS_I_VERSION_BIT, EROFS_I_VERSION_BITS); } static inline unsigned int erofs_inode_datalayout(unsigned int value) { return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT, EROFS_I_DATALAYOUT_BITS); } /* * Different from grab_cache_page_nowait(), reclaiming is never triggered * when allocating new pages. */ static inline struct page *erofs_grab_cache_page_nowait(struct address_space *mapping, pgoff_t index) { return pagecache_get_page(mapping, index, FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT, readahead_gfp_mask(mapping) & ~__GFP_RECLAIM); } extern const struct super_operations erofs_sops; extern struct file_system_type erofs_fs_type; extern const struct address_space_operations erofs_raw_access_aops; extern const struct address_space_operations z_erofs_aops; enum { BH_Encoded = BH_PrivateStart, BH_FullMapped, BH_Fragment, BH_Partialref, }; /* Has a disk mapping */ #define EROFS_MAP_MAPPED (1 << BH_Mapped) /* Located in metadata (could be copied from bd_inode) */ #define EROFS_MAP_META (1 << BH_Meta) /* The extent is encoded */ #define EROFS_MAP_ENCODED (1 << BH_Encoded) /* The length of extent is full */ #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) /* Located in the special packed inode */ #define EROFS_MAP_FRAGMENT (1 << BH_Fragment) /* The extent refers to partial decompressed data */ #define EROFS_MAP_PARTIAL_REF (1 << BH_Partialref) struct erofs_map_blocks { struct erofs_buf buf; erofs_off_t m_pa, m_la; u64 m_plen, m_llen; unsigned short m_deviceid; char m_algorithmformat; unsigned int m_flags; }; /* Flags used by erofs_map_blocks_flatmode() */ #define EROFS_GET_BLOCKS_RAW 0x0001 /* * Used to get the exact decompressed length, e.g. fiemap (consider lookback * approach instead if possible since it's more metadata lightweight.) */ #define EROFS_GET_BLOCKS_FIEMAP 0x0002 /* Used to map the whole extent if non-negligible data is requested for LZMA */ #define EROFS_GET_BLOCKS_READMORE 0x0004 /* Used to map tail extent for tailpacking inline or fragment pcluster */ #define EROFS_GET_BLOCKS_FINDTAIL 0x0008 enum { Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX, Z_EROFS_COMPRESSION_INTERLACED, Z_EROFS_COMPRESSION_RUNTIME_MAX }; /* zmap.c */ extern const struct iomap_ops z_erofs_iomap_report_ops; #ifdef CONFIG_EROFS_FS_ZIP int z_erofs_fill_inode(struct inode *inode); int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map, int flags); #else static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; } static inline int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map, int flags) { return -EOPNOTSUPP; } #endif /* !CONFIG_EROFS_FS_ZIP */ struct erofs_map_dev { struct erofs_fscache *m_fscache; struct block_device *m_bdev; struct dax_device *m_daxdev; u64 m_dax_part_off; erofs_off_t m_pa; unsigned int m_deviceid; }; /* data.c */ extern const struct file_operations erofs_file_fops; void erofs_unmap_metabuf(struct erofs_buf *buf); void erofs_put_metabuf(struct erofs_buf *buf); void *erofs_bread(struct erofs_buf *buf, struct inode *inode, erofs_blk_t blkaddr, enum erofs_kmap_type type); void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb, erofs_blk_t blkaddr, enum erofs_kmap_type type); int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev); int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len); int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map, int flags); /* inode.c */ static inline unsigned long erofs_inode_hash(erofs_nid_t nid) { #if BITS_PER_LONG == 32 return (nid >> 32) ^ (nid & 0xffffffff); #else return nid; #endif } extern const struct inode_operations erofs_generic_iops; extern const struct inode_operations erofs_symlink_iops; extern const struct inode_operations erofs_fast_symlink_iops; struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid); int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags); /* namei.c */ extern const struct inode_operations erofs_dir_iops; int erofs_namei(struct inode *dir, const struct qstr *name, erofs_nid_t *nid, unsigned int *d_type); /* dir.c */ extern const struct file_operations erofs_dir_fops; static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count) { int retried = 0; while (1) { void *p = vm_map_ram(pages, count, -1); /* retry two more times (totally 3 times) */ if (p || ++retried >= 3) return p; vm_unmap_aliases(); } return NULL; } /* pcpubuf.c */ void *erofs_get_pcpubuf(unsigned int requiredpages); void erofs_put_pcpubuf(void *ptr); int erofs_pcpubuf_growsize(unsigned int nrpages); void erofs_pcpubuf_init(void); void erofs_pcpubuf_exit(void); /* sysfs.c */ int erofs_register_sysfs(struct super_block *sb); void erofs_unregister_sysfs(struct super_block *sb); int __init erofs_init_sysfs(void); void erofs_exit_sysfs(void); /* utils.c / zdata.c */ struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp); static inline void erofs_pagepool_add(struct page **pagepool, struct page *page) { set_page_private(page, (unsigned long)*pagepool); *pagepool = page; } void erofs_release_pages(struct page **pagepool); #ifdef CONFIG_EROFS_FS_ZIP int erofs_workgroup_put(struct erofs_workgroup *grp); struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, pgoff_t index); struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb, struct erofs_workgroup *grp); void erofs_workgroup_free_rcu(struct erofs_workgroup *grp); void erofs_shrinker_register(struct super_block *sb); void erofs_shrinker_unregister(struct super_block *sb); int __init erofs_init_shrinker(void); void erofs_exit_shrinker(void); int __init z_erofs_init_zip_subsystem(void); void z_erofs_exit_zip_subsystem(void); int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, struct erofs_workgroup *egrp); int erofs_try_to_free_cached_page(struct page *page); int z_erofs_load_lz4_config(struct super_block *sb, struct erofs_super_block *dsb, struct z_erofs_lz4_cfgs *lz4, int len); #else static inline void erofs_shrinker_register(struct super_block *sb) {} static inline void erofs_shrinker_unregister(struct super_block *sb) {} static inline int erofs_init_shrinker(void) { return 0; } static inline void erofs_exit_shrinker(void) {} static inline int z_erofs_init_zip_subsystem(void) { return 0; } static inline void z_erofs_exit_zip_subsystem(void) {} static inline int z_erofs_load_lz4_config(struct super_block *sb, struct erofs_super_block *dsb, struct z_erofs_lz4_cfgs *lz4, int len) { if (lz4 || dsb->u1.lz4_max_distance) { erofs_err(sb, "lz4 algorithm isn't enabled"); return -EINVAL; } return 0; } #endif /* !CONFIG_EROFS_FS_ZIP */ #ifdef CONFIG_EROFS_FS_ZIP_LZMA int z_erofs_lzma_init(void); void z_erofs_lzma_exit(void); int z_erofs_load_lzma_config(struct super_block *sb, struct erofs_super_block *dsb, struct z_erofs_lzma_cfgs *lzma, int size); #else static inline int z_erofs_lzma_init(void) { return 0; } static inline int z_erofs_lzma_exit(void) { return 0; } static inline int z_erofs_load_lzma_config(struct super_block *sb, struct erofs_super_block *dsb, struct z_erofs_lzma_cfgs *lzma, int size) { if (lzma) { erofs_err(sb, "lzma algorithm isn't enabled"); return -EINVAL; } return 0; } #endif /* !CONFIG_EROFS_FS_ZIP */ /* flags for erofs_fscache_register_cookie() */ #define EROFS_REG_COOKIE_NEED_INODE 1 #define EROFS_REG_COOKIE_NEED_NOEXIST 2 /* fscache.c */ #ifdef CONFIG_EROFS_FS_ONDEMAND int erofs_fscache_register_fs(struct super_block *sb); void erofs_fscache_unregister_fs(struct super_block *sb); struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, char *name, unsigned int flags); void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache); extern const struct address_space_operations erofs_fscache_access_aops; #else static inline int erofs_fscache_register_fs(struct super_block *sb) { return -EOPNOTSUPP; } static inline void erofs_fscache_unregister_fs(struct super_block *sb) {} static inline struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, char *name, unsigned int flags) { return ERR_PTR(-EOPNOTSUPP); } static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache) { } #endif #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ #endif /* __EROFS_INTERNAL_H */