/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2017-2018 HUAWEI, Inc. * http://www.huawei.com/ * Created by Gao Xiang <gaoxiang25@huawei.com> */ #ifndef __EROFS_INTERNAL_H #define __EROFS_INTERNAL_H #include <linux/fs.h> #include <linux/dcache.h> #include <linux/mm.h> #include <linux/pagemap.h> #include <linux/bio.h> #include <linux/buffer_head.h> #include <linux/magic.h> #include <linux/slab.h> #include <linux/vmalloc.h> #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_sb_info { #ifdef CONFIG_EROFS_FS_ZIP /* list for all registered superblocks, mainly for shrinker */ struct list_head list; struct mutex umount_mutex; /* the dedicated workstation for compression */ struct radix_tree_root workstn_tree; /* threshold for decompression synchronously */ unsigned int max_sync_decompress_pages; unsigned int shrinker_run_no; /* current strategy of how to use managed cache */ unsigned char cache_strategy; /* pseudo inode to manage cached pages */ struct inode *managed_cache; #endif /* CONFIG_EROFS_FS_ZIP */ u32 blocks; u32 meta_blkaddr; #ifdef CONFIG_EROFS_FS_XATTR u32 xattr_blkaddr; #endif /* inode slot unit size in bit shift */ unsigned char islotbits; u32 build_time_nsec; u64 build_time; /* what we really care is nid, rather than ino.. */ erofs_nid_t root_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; unsigned int mount_opt; }; #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 clear_opt(sbi, option) ((sbi)->mount_opt &= ~EROFS_MOUNT_##option) #define set_opt(sbi, option) ((sbi)->mount_opt |= EROFS_MOUNT_##option) #define test_opt(sbi, option) ((sbi)->mount_opt & EROFS_MOUNT_##option) #ifdef CONFIG_EROFS_FS_ZIP 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; }; #if defined(CONFIG_SMP) 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); } #else static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, int val) { preempt_disable(); /* no need to spin on UP platforms, let's just disable preemption. */ if (val != atomic_read(&grp->refcount)) { preempt_enable(); return false; } return true; } static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, int orig_val) { preempt_enable(); } static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) { int v = atomic_read(&grp->refcount); /* workgroup is never freezed on uniprocessor systems */ DBG_BUGON(v == EROFS_LOCKED_MAGIC); return v; } #endif /* !CONFIG_SMP */ /* hard limit of pages per compressed cluster */ #define Z_EROFS_CLUSTER_MAX_PAGES (CONFIG_EROFS_FS_CLUSTER_PAGE_LIMIT) #define EROFS_PCPUBUF_NR_PAGES Z_EROFS_CLUSTER_MAX_PAGES #else #define EROFS_PCPUBUF_NR_PAGES 0 #endif /* !CONFIG_EROFS_FS_ZIP */ /* 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 #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); } /* 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 short xattr_isize; unsigned int xattr_shared_count; unsigned int *xattr_shared_xattrs; union { erofs_blk_t raw_blkaddr; #ifdef CONFIG_EROFS_FS_ZIP struct { unsigned short z_advise; unsigned char z_algorithmtype[2]; unsigned char z_logical_clusterbits; unsigned char z_physical_clusterbits[2]; }; #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); } extern const struct super_operations erofs_sops; extern const struct address_space_operations erofs_raw_access_aops; extern const struct address_space_operations z_erofs_aops; /* * Logical to physical block mapping, used by erofs_map_blocks() * * Different with other file systems, it is used for 2 access modes: * * 1) RAW access mode: * * Users pass a valid (m_lblk, m_lofs -- usually 0) pair, * and get the valid m_pblk, m_pofs and the longest m_len(in bytes). * * Note that m_lblk in the RAW access mode refers to the number of * the compressed ondisk block rather than the uncompressed * in-memory block for the compressed file. * * m_pofs equals to m_lofs except for the inline data page. * * 2) Normal access mode: * * If the inode is not compressed, it has no difference with * the RAW access mode. However, if the inode is compressed, * users should pass a valid (m_lblk, m_lofs) pair, and get * the needed m_pblk, m_pofs, m_len to get the compressed data * and the updated m_lblk, m_lofs which indicates the start * of the corresponding uncompressed data in the file. */ enum { BH_Zipped = BH_PrivateStart, BH_FullMapped, }; /* 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 has been compressed */ #define EROFS_MAP_ZIPPED (1 << BH_Zipped) /* The length of extent is full */ #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) struct erofs_map_blocks { erofs_off_t m_pa, m_la; u64 m_plen, m_llen; unsigned int m_flags; struct page *mpage; }; /* Flags used by erofs_map_blocks() */ #define EROFS_GET_BLOCKS_RAW 0x0001 /* zmap.c */ #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 */ /* data.c */ struct page *erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr); int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int); /* 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, bool dir); int erofs_getattr(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, struct qstr *name, erofs_nid_t *nid, unsigned int *d_type); /* dir.c */ extern const struct file_operations erofs_dir_fops; /* utils.c / zdata.c */ struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp); #if (EROFS_PCPUBUF_NR_PAGES > 0) void *erofs_get_pcpubuf(unsigned int pagenr); #define erofs_put_pcpubuf(buf) do { \ (void)&(buf); \ preempt_enable(); \ } while (0) #else static inline void *erofs_get_pcpubuf(unsigned int pagenr) { return ERR_PTR(-EOPNOTSUPP); } #define erofs_put_pcpubuf(buf) do {} while (0) #endif #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, bool *tag); int erofs_register_workgroup(struct super_block *sb, struct erofs_workgroup *grp, bool tag); 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 address_space *mapping, struct page *page); #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) {} #endif /* !CONFIG_EROFS_FS_ZIP */ #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ #endif /* __EROFS_INTERNAL_H */