147e4937aSGao Xiang /* SPDX-License-Identifier: GPL-2.0-only */ 247e4937aSGao Xiang /* 347e4937aSGao Xiang * Copyright (C) 2017-2018 HUAWEI, Inc. 4592e7cd0SAlexander A. Klimov * https://www.huawei.com/ 547e4937aSGao Xiang */ 647e4937aSGao Xiang #ifndef __EROFS_INTERNAL_H 747e4937aSGao Xiang #define __EROFS_INTERNAL_H 847e4937aSGao Xiang 947e4937aSGao Xiang #include <linux/fs.h> 1047e4937aSGao Xiang #include <linux/dcache.h> 1147e4937aSGao Xiang #include <linux/mm.h> 1247e4937aSGao Xiang #include <linux/pagemap.h> 1347e4937aSGao Xiang #include <linux/bio.h> 1447e4937aSGao Xiang #include <linux/buffer_head.h> 1547e4937aSGao Xiang #include <linux/magic.h> 1647e4937aSGao Xiang #include <linux/slab.h> 1747e4937aSGao Xiang #include <linux/vmalloc.h> 1847e4937aSGao Xiang #include "erofs_fs.h" 1947e4937aSGao Xiang 2047e4937aSGao Xiang /* redefine pr_fmt "erofs: " */ 2147e4937aSGao Xiang #undef pr_fmt 2247e4937aSGao Xiang #define pr_fmt(fmt) "erofs: " fmt 2347e4937aSGao Xiang 244f761fa2SGao Xiang __printf(3, 4) void _erofs_err(struct super_block *sb, 254f761fa2SGao Xiang const char *function, const char *fmt, ...); 264f761fa2SGao Xiang #define erofs_err(sb, fmt, ...) \ 274f761fa2SGao Xiang _erofs_err(sb, __func__, fmt "\n", ##__VA_ARGS__) 284f761fa2SGao Xiang __printf(3, 4) void _erofs_info(struct super_block *sb, 294f761fa2SGao Xiang const char *function, const char *fmt, ...); 304f761fa2SGao Xiang #define erofs_info(sb, fmt, ...) \ 314f761fa2SGao Xiang _erofs_info(sb, __func__, fmt "\n", ##__VA_ARGS__) 3247e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_DEBUG 334f761fa2SGao Xiang #define erofs_dbg(x, ...) pr_debug(x "\n", ##__VA_ARGS__) 3447e4937aSGao Xiang #define DBG_BUGON BUG_ON 3547e4937aSGao Xiang #else 364f761fa2SGao Xiang #define erofs_dbg(x, ...) ((void)0) 3747e4937aSGao Xiang #define DBG_BUGON(x) ((void)(x)) 3847e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_DEBUG */ 3947e4937aSGao Xiang 4047e4937aSGao Xiang /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */ 4147e4937aSGao Xiang #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1 4247e4937aSGao Xiang 4347e4937aSGao Xiang typedef u64 erofs_nid_t; 4447e4937aSGao Xiang typedef u64 erofs_off_t; 4547e4937aSGao Xiang /* data type for filesystem-wide blocks number */ 4647e4937aSGao Xiang typedef u32 erofs_blk_t; 4747e4937aSGao Xiang 48f57a3fe4SChao Yu struct erofs_fs_context { 49f57a3fe4SChao Yu #ifdef CONFIG_EROFS_FS_ZIP 50f57a3fe4SChao Yu /* current strategy of how to use managed cache */ 51f57a3fe4SChao Yu unsigned char cache_strategy; 5230048cdaSHuang Jianan /* strategy of sync decompression (false - auto, true - force on) */ 5330048cdaSHuang Jianan bool readahead_sync_decompress; 54f57a3fe4SChao Yu 55f57a3fe4SChao Yu /* threshold for decompression synchronously */ 56f57a3fe4SChao Yu unsigned int max_sync_decompress_pages; 57f57a3fe4SChao Yu #endif 58f57a3fe4SChao Yu unsigned int mount_opt; 59f57a3fe4SChao Yu }; 60f57a3fe4SChao Yu 615d50538fSHuang Jianan /* all filesystem-wide lz4 configurations */ 625d50538fSHuang Jianan struct erofs_sb_lz4_info { 635d50538fSHuang Jianan /* # of pages needed for EROFS lz4 rolling decompression */ 645d50538fSHuang Jianan u16 max_distance_pages; 654fea63f7SGao Xiang /* maximum possible blocks for pclusters in the filesystem */ 664fea63f7SGao Xiang u16 max_pclusterblks; 675d50538fSHuang Jianan }; 685d50538fSHuang Jianan 6947e4937aSGao Xiang struct erofs_sb_info { 7047e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 7147e4937aSGao Xiang /* list for all registered superblocks, mainly for shrinker */ 7247e4937aSGao Xiang struct list_head list; 7347e4937aSGao Xiang struct mutex umount_mutex; 7447e4937aSGao Xiang 7564094a04SGao Xiang /* managed XArray arranged in physical block number */ 7664094a04SGao Xiang struct xarray managed_pslots; 7747e4937aSGao Xiang 7847e4937aSGao Xiang unsigned int shrinker_run_no; 7914373711SGao Xiang u16 available_compr_algs; 8047e4937aSGao Xiang 8147e4937aSGao Xiang /* pseudo inode to manage cached pages */ 8247e4937aSGao Xiang struct inode *managed_cache; 835d50538fSHuang Jianan 845d50538fSHuang Jianan struct erofs_sb_lz4_info lz4; 8547e4937aSGao Xiang #endif /* CONFIG_EROFS_FS_ZIP */ 86*06252e9cSGao Xiang struct dax_device *dax_dev; 8747e4937aSGao Xiang u32 blocks; 8847e4937aSGao Xiang u32 meta_blkaddr; 8947e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_XATTR 9047e4937aSGao Xiang u32 xattr_blkaddr; 9147e4937aSGao Xiang #endif 9247e4937aSGao Xiang 9347e4937aSGao Xiang /* inode slot unit size in bit shift */ 9447e4937aSGao Xiang unsigned char islotbits; 9547e4937aSGao Xiang 9614373711SGao Xiang u32 sb_size; /* total superblock size */ 9747e4937aSGao Xiang u32 build_time_nsec; 9847e4937aSGao Xiang u64 build_time; 9947e4937aSGao Xiang 10047e4937aSGao Xiang /* what we really care is nid, rather than ino.. */ 10147e4937aSGao Xiang erofs_nid_t root_nid; 10247e4937aSGao Xiang /* used for statfs, f_files - f_favail */ 10347e4937aSGao Xiang u64 inos; 10447e4937aSGao Xiang 10547e4937aSGao Xiang u8 uuid[16]; /* 128-bit uuid for volume */ 10647e4937aSGao Xiang u8 volume_name[16]; /* volume name */ 107b858a484SPratik Shinde u32 feature_compat; 108426a9308SGao Xiang u32 feature_incompat; 10947e4937aSGao Xiang 110f57a3fe4SChao Yu struct erofs_fs_context ctx; /* options */ 11147e4937aSGao Xiang }; 11247e4937aSGao Xiang 11347e4937aSGao Xiang #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) 11447e4937aSGao Xiang #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) 11547e4937aSGao Xiang 11647e4937aSGao Xiang /* Mount flags set via mount options or defaults */ 11747e4937aSGao Xiang #define EROFS_MOUNT_XATTR_USER 0x00000010 11847e4937aSGao Xiang #define EROFS_MOUNT_POSIX_ACL 0x00000020 119*06252e9cSGao Xiang #define EROFS_MOUNT_DAX_ALWAYS 0x00000040 120*06252e9cSGao Xiang #define EROFS_MOUNT_DAX_NEVER 0x00000080 12147e4937aSGao Xiang 122f57a3fe4SChao Yu #define clear_opt(ctx, option) ((ctx)->mount_opt &= ~EROFS_MOUNT_##option) 123f57a3fe4SChao Yu #define set_opt(ctx, option) ((ctx)->mount_opt |= EROFS_MOUNT_##option) 124f57a3fe4SChao Yu #define test_opt(ctx, option) ((ctx)->mount_opt & EROFS_MOUNT_##option) 12547e4937aSGao Xiang 12647e4937aSGao Xiang enum { 12747e4937aSGao Xiang EROFS_ZIP_CACHE_DISABLED, 12847e4937aSGao Xiang EROFS_ZIP_CACHE_READAHEAD, 12947e4937aSGao Xiang EROFS_ZIP_CACHE_READAROUND 13047e4937aSGao Xiang }; 13147e4937aSGao Xiang 132f57a3fe4SChao Yu #ifdef CONFIG_EROFS_FS_ZIP 13347e4937aSGao Xiang #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL) 13447e4937aSGao Xiang 13547e4937aSGao Xiang /* basic unit of the workstation of a super_block */ 13647e4937aSGao Xiang struct erofs_workgroup { 13747e4937aSGao Xiang /* the workgroup index in the workstation */ 13847e4937aSGao Xiang pgoff_t index; 13947e4937aSGao Xiang 14047e4937aSGao Xiang /* overall workgroup reference count */ 14147e4937aSGao Xiang atomic_t refcount; 14247e4937aSGao Xiang }; 14347e4937aSGao Xiang 14447e4937aSGao Xiang #if defined(CONFIG_SMP) 14547e4937aSGao Xiang static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 14647e4937aSGao Xiang int val) 14747e4937aSGao Xiang { 14847e4937aSGao Xiang preempt_disable(); 14947e4937aSGao Xiang if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) { 15047e4937aSGao Xiang preempt_enable(); 15147e4937aSGao Xiang return false; 15247e4937aSGao Xiang } 15347e4937aSGao Xiang return true; 15447e4937aSGao Xiang } 15547e4937aSGao Xiang 15647e4937aSGao Xiang static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 15747e4937aSGao Xiang int orig_val) 15847e4937aSGao Xiang { 15947e4937aSGao Xiang /* 16047e4937aSGao Xiang * other observers should notice all modifications 16147e4937aSGao Xiang * in the freezing period. 16247e4937aSGao Xiang */ 16347e4937aSGao Xiang smp_mb(); 16447e4937aSGao Xiang atomic_set(&grp->refcount, orig_val); 16547e4937aSGao Xiang preempt_enable(); 16647e4937aSGao Xiang } 16747e4937aSGao Xiang 16847e4937aSGao Xiang static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 16947e4937aSGao Xiang { 17047e4937aSGao Xiang return atomic_cond_read_relaxed(&grp->refcount, 17147e4937aSGao Xiang VAL != EROFS_LOCKED_MAGIC); 17247e4937aSGao Xiang } 17347e4937aSGao Xiang #else 17447e4937aSGao Xiang static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 17547e4937aSGao Xiang int val) 17647e4937aSGao Xiang { 17747e4937aSGao Xiang preempt_disable(); 17847e4937aSGao Xiang /* no need to spin on UP platforms, let's just disable preemption. */ 17947e4937aSGao Xiang if (val != atomic_read(&grp->refcount)) { 18047e4937aSGao Xiang preempt_enable(); 18147e4937aSGao Xiang return false; 18247e4937aSGao Xiang } 18347e4937aSGao Xiang return true; 18447e4937aSGao Xiang } 18547e4937aSGao Xiang 18647e4937aSGao Xiang static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 18747e4937aSGao Xiang int orig_val) 18847e4937aSGao Xiang { 18947e4937aSGao Xiang preempt_enable(); 19047e4937aSGao Xiang } 19147e4937aSGao Xiang 19247e4937aSGao Xiang static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 19347e4937aSGao Xiang { 19447e4937aSGao Xiang int v = atomic_read(&grp->refcount); 19547e4937aSGao Xiang 19647e4937aSGao Xiang /* workgroup is never freezed on uniprocessor systems */ 19747e4937aSGao Xiang DBG_BUGON(v == EROFS_LOCKED_MAGIC); 19847e4937aSGao Xiang return v; 19947e4937aSGao Xiang } 20047e4937aSGao Xiang #endif /* !CONFIG_SMP */ 20147e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 20247e4937aSGao Xiang 20347e4937aSGao Xiang /* we strictly follow PAGE_SIZE and no buffer head yet */ 20447e4937aSGao Xiang #define LOG_BLOCK_SIZE PAGE_SHIFT 20547e4937aSGao Xiang 20647e4937aSGao Xiang #undef LOG_SECTORS_PER_BLOCK 20747e4937aSGao Xiang #define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) 20847e4937aSGao Xiang 20947e4937aSGao Xiang #undef SECTORS_PER_BLOCK 21047e4937aSGao Xiang #define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK) 21147e4937aSGao Xiang 21247e4937aSGao Xiang #define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE) 21347e4937aSGao Xiang 21447e4937aSGao Xiang #if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ) 21547e4937aSGao Xiang #error erofs cannot be used in this platform 21647e4937aSGao Xiang #endif 21747e4937aSGao Xiang 21847e4937aSGao Xiang #define ROOT_NID(sb) ((sb)->root_nid) 21947e4937aSGao Xiang 22047e4937aSGao Xiang #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) 22147e4937aSGao Xiang #define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ) 22247e4937aSGao Xiang #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ) 22347e4937aSGao Xiang 22447e4937aSGao Xiang static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid) 22547e4937aSGao Xiang { 22647e4937aSGao Xiang return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits); 22747e4937aSGao Xiang } 22847e4937aSGao Xiang 229de06a6a3SGao Xiang #define EROFS_FEATURE_FUNCS(name, compat, feature) \ 230de06a6a3SGao Xiang static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \ 231de06a6a3SGao Xiang { \ 232de06a6a3SGao Xiang return sbi->feature_##compat & EROFS_FEATURE_##feature; \ 233de06a6a3SGao Xiang } 234de06a6a3SGao Xiang 235de06a6a3SGao Xiang EROFS_FEATURE_FUNCS(lz4_0padding, incompat, INCOMPAT_LZ4_0PADDING) 23614373711SGao Xiang EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS) 2375404c330SGao Xiang EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER) 238de06a6a3SGao Xiang EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) 239de06a6a3SGao Xiang 24047e4937aSGao Xiang /* atomic flag definitions */ 241a5876e24SGao Xiang #define EROFS_I_EA_INITED_BIT 0 242a5876e24SGao Xiang #define EROFS_I_Z_INITED_BIT 1 24347e4937aSGao Xiang 24447e4937aSGao Xiang /* bitlock definitions (arranged in reverse order) */ 245a5876e24SGao Xiang #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) 246a5876e24SGao Xiang #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) 24747e4937aSGao Xiang 248a5876e24SGao Xiang struct erofs_inode { 24947e4937aSGao Xiang erofs_nid_t nid; 25047e4937aSGao Xiang 25147e4937aSGao Xiang /* atomic flags (including bitlocks) */ 25247e4937aSGao Xiang unsigned long flags; 25347e4937aSGao Xiang 2548a765682SGao Xiang unsigned char datalayout; 25547e4937aSGao Xiang unsigned char inode_isize; 25647e4937aSGao Xiang unsigned short xattr_isize; 25747e4937aSGao Xiang 25847e4937aSGao Xiang unsigned int xattr_shared_count; 25947e4937aSGao Xiang unsigned int *xattr_shared_xattrs; 26047e4937aSGao Xiang 26147e4937aSGao Xiang union { 26247e4937aSGao Xiang erofs_blk_t raw_blkaddr; 26347e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 26447e4937aSGao Xiang struct { 26547e4937aSGao Xiang unsigned short z_advise; 26647e4937aSGao Xiang unsigned char z_algorithmtype[2]; 26747e4937aSGao Xiang unsigned char z_logical_clusterbits; 26847e4937aSGao Xiang }; 26947e4937aSGao Xiang #endif /* CONFIG_EROFS_FS_ZIP */ 27047e4937aSGao Xiang }; 27147e4937aSGao Xiang /* the corresponding vfs inode */ 27247e4937aSGao Xiang struct inode vfs_inode; 27347e4937aSGao Xiang }; 27447e4937aSGao Xiang 275a5876e24SGao Xiang #define EROFS_I(ptr) \ 276a5876e24SGao Xiang container_of(ptr, struct erofs_inode, vfs_inode) 27747e4937aSGao Xiang 27899634bf3SGao Xiang static inline unsigned long erofs_inode_datablocks(struct inode *inode) 27947e4937aSGao Xiang { 28047e4937aSGao Xiang /* since i_size cannot be changed */ 28147e4937aSGao Xiang return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ); 28247e4937aSGao Xiang } 28347e4937aSGao Xiang 2848a765682SGao Xiang static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit, 2858a765682SGao Xiang unsigned int bits) 28647e4937aSGao Xiang { 2878a765682SGao Xiang 2888a765682SGao Xiang return (value >> bit) & ((1 << bits) - 1); 28947e4937aSGao Xiang } 29047e4937aSGao Xiang 2918a765682SGao Xiang 2928a765682SGao Xiang static inline unsigned int erofs_inode_version(unsigned int value) 29347e4937aSGao Xiang { 2948a765682SGao Xiang return erofs_bitrange(value, EROFS_I_VERSION_BIT, 2958a765682SGao Xiang EROFS_I_VERSION_BITS); 2968a765682SGao Xiang } 2978a765682SGao Xiang 2988a765682SGao Xiang static inline unsigned int erofs_inode_datalayout(unsigned int value) 2998a765682SGao Xiang { 3008a765682SGao Xiang return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT, 3018a765682SGao Xiang EROFS_I_DATALAYOUT_BITS); 30247e4937aSGao Xiang } 30347e4937aSGao Xiang 30447e4937aSGao Xiang extern const struct super_operations erofs_sops; 30547e4937aSGao Xiang 30647e4937aSGao Xiang extern const struct address_space_operations erofs_raw_access_aops; 3070c638f70SGao Xiang extern const struct address_space_operations z_erofs_aops; 30847e4937aSGao Xiang 30947e4937aSGao Xiang /* 3108137824eSYue Hu * Logical to physical block mapping 31147e4937aSGao Xiang * 31247e4937aSGao Xiang * Different with other file systems, it is used for 2 access modes: 31347e4937aSGao Xiang * 31447e4937aSGao Xiang * 1) RAW access mode: 31547e4937aSGao Xiang * 31647e4937aSGao Xiang * Users pass a valid (m_lblk, m_lofs -- usually 0) pair, 31747e4937aSGao Xiang * and get the valid m_pblk, m_pofs and the longest m_len(in bytes). 31847e4937aSGao Xiang * 31947e4937aSGao Xiang * Note that m_lblk in the RAW access mode refers to the number of 32047e4937aSGao Xiang * the compressed ondisk block rather than the uncompressed 32147e4937aSGao Xiang * in-memory block for the compressed file. 32247e4937aSGao Xiang * 32347e4937aSGao Xiang * m_pofs equals to m_lofs except for the inline data page. 32447e4937aSGao Xiang * 32547e4937aSGao Xiang * 2) Normal access mode: 32647e4937aSGao Xiang * 32747e4937aSGao Xiang * If the inode is not compressed, it has no difference with 32847e4937aSGao Xiang * the RAW access mode. However, if the inode is compressed, 32947e4937aSGao Xiang * users should pass a valid (m_lblk, m_lofs) pair, and get 33047e4937aSGao Xiang * the needed m_pblk, m_pofs, m_len to get the compressed data 33147e4937aSGao Xiang * and the updated m_lblk, m_lofs which indicates the start 33247e4937aSGao Xiang * of the corresponding uncompressed data in the file. 33347e4937aSGao Xiang */ 33447e4937aSGao Xiang enum { 33547e4937aSGao Xiang BH_Zipped = BH_PrivateStart, 33647e4937aSGao Xiang BH_FullMapped, 33747e4937aSGao Xiang }; 33847e4937aSGao Xiang 33947e4937aSGao Xiang /* Has a disk mapping */ 34047e4937aSGao Xiang #define EROFS_MAP_MAPPED (1 << BH_Mapped) 34147e4937aSGao Xiang /* Located in metadata (could be copied from bd_inode) */ 34247e4937aSGao Xiang #define EROFS_MAP_META (1 << BH_Meta) 34347e4937aSGao Xiang /* The extent has been compressed */ 34447e4937aSGao Xiang #define EROFS_MAP_ZIPPED (1 << BH_Zipped) 34547e4937aSGao Xiang /* The length of extent is full */ 34647e4937aSGao Xiang #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) 34747e4937aSGao Xiang 34847e4937aSGao Xiang struct erofs_map_blocks { 34947e4937aSGao Xiang erofs_off_t m_pa, m_la; 35047e4937aSGao Xiang u64 m_plen, m_llen; 35147e4937aSGao Xiang 35247e4937aSGao Xiang unsigned int m_flags; 35347e4937aSGao Xiang 35447e4937aSGao Xiang struct page *mpage; 35547e4937aSGao Xiang }; 35647e4937aSGao Xiang 3578137824eSYue Hu /* Flags used by erofs_map_blocks_flatmode() */ 35847e4937aSGao Xiang #define EROFS_GET_BLOCKS_RAW 0x0001 35947e4937aSGao Xiang 36047e4937aSGao Xiang /* zmap.c */ 36147e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 36247e4937aSGao Xiang int z_erofs_fill_inode(struct inode *inode); 36347e4937aSGao Xiang int z_erofs_map_blocks_iter(struct inode *inode, 36447e4937aSGao Xiang struct erofs_map_blocks *map, 36547e4937aSGao Xiang int flags); 36647e4937aSGao Xiang #else 36747e4937aSGao Xiang static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; } 36847e4937aSGao Xiang static inline int z_erofs_map_blocks_iter(struct inode *inode, 36947e4937aSGao Xiang struct erofs_map_blocks *map, 37047e4937aSGao Xiang int flags) 37147e4937aSGao Xiang { 37247e4937aSGao Xiang return -EOPNOTSUPP; 37347e4937aSGao Xiang } 37447e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 37547e4937aSGao Xiang 37647e4937aSGao Xiang /* data.c */ 377a08e67a0SHuang Jianan extern const struct file_operations erofs_file_fops; 378e655b5b3SGao Xiang struct page *erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr); 37947e4937aSGao Xiang 38047e4937aSGao Xiang /* inode.c */ 38147e4937aSGao Xiang static inline unsigned long erofs_inode_hash(erofs_nid_t nid) 38247e4937aSGao Xiang { 38347e4937aSGao Xiang #if BITS_PER_LONG == 32 38447e4937aSGao Xiang return (nid >> 32) ^ (nid & 0xffffffff); 38547e4937aSGao Xiang #else 38647e4937aSGao Xiang return nid; 38747e4937aSGao Xiang #endif 38847e4937aSGao Xiang } 38947e4937aSGao Xiang 39047e4937aSGao Xiang extern const struct inode_operations erofs_generic_iops; 39147e4937aSGao Xiang extern const struct inode_operations erofs_symlink_iops; 39247e4937aSGao Xiang extern const struct inode_operations erofs_fast_symlink_iops; 39347e4937aSGao Xiang 39447e4937aSGao Xiang struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir); 395549c7297SChristian Brauner int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path, 396549c7297SChristian Brauner struct kstat *stat, u32 request_mask, 397549c7297SChristian Brauner unsigned int query_flags); 39847e4937aSGao Xiang 39947e4937aSGao Xiang /* namei.c */ 40047e4937aSGao Xiang extern const struct inode_operations erofs_dir_iops; 40147e4937aSGao Xiang 40247e4937aSGao Xiang int erofs_namei(struct inode *dir, struct qstr *name, 40347e4937aSGao Xiang erofs_nid_t *nid, unsigned int *d_type); 40447e4937aSGao Xiang 40547e4937aSGao Xiang /* dir.c */ 40647e4937aSGao Xiang extern const struct file_operations erofs_dir_fops; 40747e4937aSGao Xiang 408598162d0SGao Xiang static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count) 409598162d0SGao Xiang { 410598162d0SGao Xiang int retried = 0; 411598162d0SGao Xiang 412598162d0SGao Xiang while (1) { 413598162d0SGao Xiang void *p = vm_map_ram(pages, count, -1); 414598162d0SGao Xiang 415598162d0SGao Xiang /* retry two more times (totally 3 times) */ 416598162d0SGao Xiang if (p || ++retried >= 3) 417598162d0SGao Xiang return p; 418598162d0SGao Xiang vm_unmap_aliases(); 419598162d0SGao Xiang } 420598162d0SGao Xiang return NULL; 421598162d0SGao Xiang } 422598162d0SGao Xiang 42352488734SGao Xiang /* pcpubuf.c */ 42452488734SGao Xiang void *erofs_get_pcpubuf(unsigned int requiredpages); 42552488734SGao Xiang void erofs_put_pcpubuf(void *ptr); 42652488734SGao Xiang int erofs_pcpubuf_growsize(unsigned int nrpages); 42752488734SGao Xiang void erofs_pcpubuf_init(void); 42852488734SGao Xiang void erofs_pcpubuf_exit(void); 42952488734SGao Xiang 43047e4937aSGao Xiang /* utils.c / zdata.c */ 4315ddcee1fSGao Xiang struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp); 43247e4937aSGao Xiang 43347e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 43447e4937aSGao Xiang int erofs_workgroup_put(struct erofs_workgroup *grp); 43547e4937aSGao Xiang struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, 436997626d8SVladimir Zapolskiy pgoff_t index); 43764094a04SGao Xiang struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb, 438e5e9a432SVladimir Zapolskiy struct erofs_workgroup *grp); 43947e4937aSGao Xiang void erofs_workgroup_free_rcu(struct erofs_workgroup *grp); 44047e4937aSGao Xiang void erofs_shrinker_register(struct super_block *sb); 44147e4937aSGao Xiang void erofs_shrinker_unregister(struct super_block *sb); 44247e4937aSGao Xiang int __init erofs_init_shrinker(void); 44347e4937aSGao Xiang void erofs_exit_shrinker(void); 44447e4937aSGao Xiang int __init z_erofs_init_zip_subsystem(void); 44547e4937aSGao Xiang void z_erofs_exit_zip_subsystem(void); 44647e4937aSGao Xiang int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 44747e4937aSGao Xiang struct erofs_workgroup *egrp); 44847e4937aSGao Xiang int erofs_try_to_free_cached_page(struct address_space *mapping, 44947e4937aSGao Xiang struct page *page); 4505d50538fSHuang Jianan int z_erofs_load_lz4_config(struct super_block *sb, 45146249cdeSGao Xiang struct erofs_super_block *dsb, 45246249cdeSGao Xiang struct z_erofs_lz4_cfgs *lz4, int len); 45347e4937aSGao Xiang #else 45447e4937aSGao Xiang static inline void erofs_shrinker_register(struct super_block *sb) {} 45547e4937aSGao Xiang static inline void erofs_shrinker_unregister(struct super_block *sb) {} 45647e4937aSGao Xiang static inline int erofs_init_shrinker(void) { return 0; } 45747e4937aSGao Xiang static inline void erofs_exit_shrinker(void) {} 45847e4937aSGao Xiang static inline int z_erofs_init_zip_subsystem(void) { return 0; } 45947e4937aSGao Xiang static inline void z_erofs_exit_zip_subsystem(void) {} 4605d50538fSHuang Jianan static inline int z_erofs_load_lz4_config(struct super_block *sb, 46146249cdeSGao Xiang struct erofs_super_block *dsb, 46246249cdeSGao Xiang struct z_erofs_lz4_cfgs *lz4, int len) 4635d50538fSHuang Jianan { 46414373711SGao Xiang if (lz4 || dsb->u1.lz4_max_distance) { 4655d50538fSHuang Jianan erofs_err(sb, "lz4 algorithm isn't enabled"); 4665d50538fSHuang Jianan return -EINVAL; 4675d50538fSHuang Jianan } 4685d50538fSHuang Jianan return 0; 4695d50538fSHuang Jianan } 47047e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 47147e4937aSGao Xiang 47247e4937aSGao Xiang #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 47347e4937aSGao Xiang 47447e4937aSGao Xiang #endif /* __EROFS_INTERNAL_H */ 475