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/ 5*c5aa903aSGao Xiang * Copyright (C) 2021, Alibaba Cloud 647e4937aSGao Xiang */ 747e4937aSGao Xiang #ifndef __EROFS_INTERNAL_H 847e4937aSGao Xiang #define __EROFS_INTERNAL_H 947e4937aSGao Xiang 1047e4937aSGao Xiang #include <linux/fs.h> 1147e4937aSGao Xiang #include <linux/dcache.h> 1247e4937aSGao Xiang #include <linux/mm.h> 1347e4937aSGao Xiang #include <linux/pagemap.h> 1447e4937aSGao Xiang #include <linux/bio.h> 1547e4937aSGao Xiang #include <linux/buffer_head.h> 1647e4937aSGao Xiang #include <linux/magic.h> 1747e4937aSGao Xiang #include <linux/slab.h> 1847e4937aSGao Xiang #include <linux/vmalloc.h> 19eadcd6b5SGao Xiang #include <linux/iomap.h> 2047e4937aSGao Xiang #include "erofs_fs.h" 2147e4937aSGao Xiang 2247e4937aSGao Xiang /* redefine pr_fmt "erofs: " */ 2347e4937aSGao Xiang #undef pr_fmt 2447e4937aSGao Xiang #define pr_fmt(fmt) "erofs: " fmt 2547e4937aSGao Xiang 264f761fa2SGao Xiang __printf(3, 4) void _erofs_err(struct super_block *sb, 274f761fa2SGao Xiang const char *function, const char *fmt, ...); 284f761fa2SGao Xiang #define erofs_err(sb, fmt, ...) \ 294f761fa2SGao Xiang _erofs_err(sb, __func__, fmt "\n", ##__VA_ARGS__) 304f761fa2SGao Xiang __printf(3, 4) void _erofs_info(struct super_block *sb, 314f761fa2SGao Xiang const char *function, const char *fmt, ...); 324f761fa2SGao Xiang #define erofs_info(sb, fmt, ...) \ 334f761fa2SGao Xiang _erofs_info(sb, __func__, fmt "\n", ##__VA_ARGS__) 3447e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_DEBUG 354f761fa2SGao Xiang #define erofs_dbg(x, ...) pr_debug(x "\n", ##__VA_ARGS__) 3647e4937aSGao Xiang #define DBG_BUGON BUG_ON 3747e4937aSGao Xiang #else 384f761fa2SGao Xiang #define erofs_dbg(x, ...) ((void)0) 3947e4937aSGao Xiang #define DBG_BUGON(x) ((void)(x)) 4047e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_DEBUG */ 4147e4937aSGao Xiang 4247e4937aSGao Xiang /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */ 4347e4937aSGao Xiang #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1 4447e4937aSGao Xiang 4547e4937aSGao Xiang typedef u64 erofs_nid_t; 4647e4937aSGao Xiang typedef u64 erofs_off_t; 4747e4937aSGao Xiang /* data type for filesystem-wide blocks number */ 4847e4937aSGao Xiang typedef u32 erofs_blk_t; 4947e4937aSGao Xiang 50f57a3fe4SChao Yu struct erofs_fs_context { 51f57a3fe4SChao Yu #ifdef CONFIG_EROFS_FS_ZIP 52f57a3fe4SChao Yu /* current strategy of how to use managed cache */ 53f57a3fe4SChao Yu unsigned char cache_strategy; 5430048cdaSHuang Jianan /* strategy of sync decompression (false - auto, true - force on) */ 5530048cdaSHuang Jianan bool readahead_sync_decompress; 56f57a3fe4SChao Yu 57f57a3fe4SChao Yu /* threshold for decompression synchronously */ 58f57a3fe4SChao Yu unsigned int max_sync_decompress_pages; 59f57a3fe4SChao Yu #endif 60f57a3fe4SChao Yu unsigned int mount_opt; 61f57a3fe4SChao Yu }; 62f57a3fe4SChao Yu 635d50538fSHuang Jianan /* all filesystem-wide lz4 configurations */ 645d50538fSHuang Jianan struct erofs_sb_lz4_info { 655d50538fSHuang Jianan /* # of pages needed for EROFS lz4 rolling decompression */ 665d50538fSHuang Jianan u16 max_distance_pages; 674fea63f7SGao Xiang /* maximum possible blocks for pclusters in the filesystem */ 684fea63f7SGao Xiang u16 max_pclusterblks; 695d50538fSHuang Jianan }; 705d50538fSHuang Jianan 7147e4937aSGao Xiang struct erofs_sb_info { 7247e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 7347e4937aSGao Xiang /* list for all registered superblocks, mainly for shrinker */ 7447e4937aSGao Xiang struct list_head list; 7547e4937aSGao Xiang struct mutex umount_mutex; 7647e4937aSGao Xiang 7764094a04SGao Xiang /* managed XArray arranged in physical block number */ 7864094a04SGao Xiang struct xarray managed_pslots; 7947e4937aSGao Xiang 8047e4937aSGao Xiang unsigned int shrinker_run_no; 8114373711SGao Xiang u16 available_compr_algs; 8247e4937aSGao Xiang 8347e4937aSGao Xiang /* pseudo inode to manage cached pages */ 8447e4937aSGao Xiang struct inode *managed_cache; 855d50538fSHuang Jianan 865d50538fSHuang Jianan struct erofs_sb_lz4_info lz4; 8747e4937aSGao Xiang #endif /* CONFIG_EROFS_FS_ZIP */ 8806252e9cSGao Xiang struct dax_device *dax_dev; 8947e4937aSGao Xiang u32 blocks; 9047e4937aSGao Xiang u32 meta_blkaddr; 9147e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_XATTR 9247e4937aSGao Xiang u32 xattr_blkaddr; 9347e4937aSGao Xiang #endif 9447e4937aSGao Xiang 9547e4937aSGao Xiang /* inode slot unit size in bit shift */ 9647e4937aSGao Xiang unsigned char islotbits; 9747e4937aSGao Xiang 9814373711SGao Xiang u32 sb_size; /* total superblock size */ 9947e4937aSGao Xiang u32 build_time_nsec; 10047e4937aSGao Xiang u64 build_time; 10147e4937aSGao Xiang 10247e4937aSGao Xiang /* what we really care is nid, rather than ino.. */ 10347e4937aSGao Xiang erofs_nid_t root_nid; 10447e4937aSGao Xiang /* used for statfs, f_files - f_favail */ 10547e4937aSGao Xiang u64 inos; 10647e4937aSGao Xiang 10747e4937aSGao Xiang u8 uuid[16]; /* 128-bit uuid for volume */ 10847e4937aSGao Xiang u8 volume_name[16]; /* volume name */ 109b858a484SPratik Shinde u32 feature_compat; 110426a9308SGao Xiang u32 feature_incompat; 11147e4937aSGao Xiang 112f57a3fe4SChao Yu struct erofs_fs_context ctx; /* options */ 11347e4937aSGao Xiang }; 11447e4937aSGao Xiang 11547e4937aSGao Xiang #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) 11647e4937aSGao Xiang #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) 11747e4937aSGao Xiang 11847e4937aSGao Xiang /* Mount flags set via mount options or defaults */ 11947e4937aSGao Xiang #define EROFS_MOUNT_XATTR_USER 0x00000010 12047e4937aSGao Xiang #define EROFS_MOUNT_POSIX_ACL 0x00000020 12106252e9cSGao Xiang #define EROFS_MOUNT_DAX_ALWAYS 0x00000040 12206252e9cSGao Xiang #define EROFS_MOUNT_DAX_NEVER 0x00000080 12347e4937aSGao Xiang 124f57a3fe4SChao Yu #define clear_opt(ctx, option) ((ctx)->mount_opt &= ~EROFS_MOUNT_##option) 125f57a3fe4SChao Yu #define set_opt(ctx, option) ((ctx)->mount_opt |= EROFS_MOUNT_##option) 126f57a3fe4SChao Yu #define test_opt(ctx, option) ((ctx)->mount_opt & EROFS_MOUNT_##option) 12747e4937aSGao Xiang 12847e4937aSGao Xiang enum { 12947e4937aSGao Xiang EROFS_ZIP_CACHE_DISABLED, 13047e4937aSGao Xiang EROFS_ZIP_CACHE_READAHEAD, 13147e4937aSGao Xiang EROFS_ZIP_CACHE_READAROUND 13247e4937aSGao Xiang }; 13347e4937aSGao Xiang 134f57a3fe4SChao Yu #ifdef CONFIG_EROFS_FS_ZIP 13547e4937aSGao Xiang #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL) 13647e4937aSGao Xiang 13747e4937aSGao Xiang /* basic unit of the workstation of a super_block */ 13847e4937aSGao Xiang struct erofs_workgroup { 13947e4937aSGao Xiang /* the workgroup index in the workstation */ 14047e4937aSGao Xiang pgoff_t index; 14147e4937aSGao Xiang 14247e4937aSGao Xiang /* overall workgroup reference count */ 14347e4937aSGao Xiang atomic_t refcount; 14447e4937aSGao Xiang }; 14547e4937aSGao Xiang 14647e4937aSGao Xiang #if defined(CONFIG_SMP) 14747e4937aSGao Xiang static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 14847e4937aSGao Xiang int val) 14947e4937aSGao Xiang { 15047e4937aSGao Xiang preempt_disable(); 15147e4937aSGao Xiang if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) { 15247e4937aSGao Xiang preempt_enable(); 15347e4937aSGao Xiang return false; 15447e4937aSGao Xiang } 15547e4937aSGao Xiang return true; 15647e4937aSGao Xiang } 15747e4937aSGao Xiang 15847e4937aSGao Xiang static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 15947e4937aSGao Xiang int orig_val) 16047e4937aSGao Xiang { 16147e4937aSGao Xiang /* 16247e4937aSGao Xiang * other observers should notice all modifications 16347e4937aSGao Xiang * in the freezing period. 16447e4937aSGao Xiang */ 16547e4937aSGao Xiang smp_mb(); 16647e4937aSGao Xiang atomic_set(&grp->refcount, orig_val); 16747e4937aSGao Xiang preempt_enable(); 16847e4937aSGao Xiang } 16947e4937aSGao Xiang 17047e4937aSGao Xiang static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 17147e4937aSGao Xiang { 17247e4937aSGao Xiang return atomic_cond_read_relaxed(&grp->refcount, 17347e4937aSGao Xiang VAL != EROFS_LOCKED_MAGIC); 17447e4937aSGao Xiang } 17547e4937aSGao Xiang #else 17647e4937aSGao Xiang static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 17747e4937aSGao Xiang int val) 17847e4937aSGao Xiang { 17947e4937aSGao Xiang preempt_disable(); 18047e4937aSGao Xiang /* no need to spin on UP platforms, let's just disable preemption. */ 18147e4937aSGao Xiang if (val != atomic_read(&grp->refcount)) { 18247e4937aSGao Xiang preempt_enable(); 18347e4937aSGao Xiang return false; 18447e4937aSGao Xiang } 18547e4937aSGao Xiang return true; 18647e4937aSGao Xiang } 18747e4937aSGao Xiang 18847e4937aSGao Xiang static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 18947e4937aSGao Xiang int orig_val) 19047e4937aSGao Xiang { 19147e4937aSGao Xiang preempt_enable(); 19247e4937aSGao Xiang } 19347e4937aSGao Xiang 19447e4937aSGao Xiang static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 19547e4937aSGao Xiang { 19647e4937aSGao Xiang int v = atomic_read(&grp->refcount); 19747e4937aSGao Xiang 19847e4937aSGao Xiang /* workgroup is never freezed on uniprocessor systems */ 19947e4937aSGao Xiang DBG_BUGON(v == EROFS_LOCKED_MAGIC); 20047e4937aSGao Xiang return v; 20147e4937aSGao Xiang } 20247e4937aSGao Xiang #endif /* !CONFIG_SMP */ 20347e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 20447e4937aSGao Xiang 20547e4937aSGao Xiang /* we strictly follow PAGE_SIZE and no buffer head yet */ 20647e4937aSGao Xiang #define LOG_BLOCK_SIZE PAGE_SHIFT 20747e4937aSGao Xiang 20847e4937aSGao Xiang #undef LOG_SECTORS_PER_BLOCK 20947e4937aSGao Xiang #define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) 21047e4937aSGao Xiang 21147e4937aSGao Xiang #undef SECTORS_PER_BLOCK 21247e4937aSGao Xiang #define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK) 21347e4937aSGao Xiang 21447e4937aSGao Xiang #define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE) 21547e4937aSGao Xiang 21647e4937aSGao Xiang #if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ) 21747e4937aSGao Xiang #error erofs cannot be used in this platform 21847e4937aSGao Xiang #endif 21947e4937aSGao Xiang 22047e4937aSGao Xiang #define ROOT_NID(sb) ((sb)->root_nid) 22147e4937aSGao Xiang 22247e4937aSGao Xiang #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) 22347e4937aSGao Xiang #define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ) 22447e4937aSGao Xiang #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ) 22547e4937aSGao Xiang 22647e4937aSGao Xiang static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid) 22747e4937aSGao Xiang { 22847e4937aSGao Xiang return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits); 22947e4937aSGao Xiang } 23047e4937aSGao Xiang 231de06a6a3SGao Xiang #define EROFS_FEATURE_FUNCS(name, compat, feature) \ 232de06a6a3SGao Xiang static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \ 233de06a6a3SGao Xiang { \ 234de06a6a3SGao Xiang return sbi->feature_##compat & EROFS_FEATURE_##feature; \ 235de06a6a3SGao Xiang } 236de06a6a3SGao Xiang 237de06a6a3SGao Xiang EROFS_FEATURE_FUNCS(lz4_0padding, incompat, INCOMPAT_LZ4_0PADDING) 23814373711SGao Xiang EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS) 2395404c330SGao Xiang EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER) 240de06a6a3SGao Xiang EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) 241de06a6a3SGao Xiang 24247e4937aSGao Xiang /* atomic flag definitions */ 243a5876e24SGao Xiang #define EROFS_I_EA_INITED_BIT 0 244a5876e24SGao Xiang #define EROFS_I_Z_INITED_BIT 1 24547e4937aSGao Xiang 24647e4937aSGao Xiang /* bitlock definitions (arranged in reverse order) */ 247a5876e24SGao Xiang #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) 248a5876e24SGao Xiang #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) 24947e4937aSGao Xiang 250a5876e24SGao Xiang struct erofs_inode { 25147e4937aSGao Xiang erofs_nid_t nid; 25247e4937aSGao Xiang 25347e4937aSGao Xiang /* atomic flags (including bitlocks) */ 25447e4937aSGao Xiang unsigned long flags; 25547e4937aSGao Xiang 2568a765682SGao Xiang unsigned char datalayout; 25747e4937aSGao Xiang unsigned char inode_isize; 25847e4937aSGao Xiang unsigned short xattr_isize; 25947e4937aSGao Xiang 26047e4937aSGao Xiang unsigned int xattr_shared_count; 26147e4937aSGao Xiang unsigned int *xattr_shared_xattrs; 26247e4937aSGao Xiang 26347e4937aSGao Xiang union { 26447e4937aSGao Xiang erofs_blk_t raw_blkaddr; 265*c5aa903aSGao Xiang struct { 266*c5aa903aSGao Xiang unsigned short chunkformat; 267*c5aa903aSGao Xiang unsigned char chunkbits; 268*c5aa903aSGao Xiang }; 26947e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 27047e4937aSGao Xiang struct { 27147e4937aSGao Xiang unsigned short z_advise; 27247e4937aSGao Xiang unsigned char z_algorithmtype[2]; 27347e4937aSGao Xiang unsigned char z_logical_clusterbits; 27447e4937aSGao Xiang }; 27547e4937aSGao Xiang #endif /* CONFIG_EROFS_FS_ZIP */ 27647e4937aSGao Xiang }; 27747e4937aSGao Xiang /* the corresponding vfs inode */ 27847e4937aSGao Xiang struct inode vfs_inode; 27947e4937aSGao Xiang }; 28047e4937aSGao Xiang 281a5876e24SGao Xiang #define EROFS_I(ptr) \ 282a5876e24SGao Xiang container_of(ptr, struct erofs_inode, vfs_inode) 28347e4937aSGao Xiang 28499634bf3SGao Xiang static inline unsigned long erofs_inode_datablocks(struct inode *inode) 28547e4937aSGao Xiang { 28647e4937aSGao Xiang /* since i_size cannot be changed */ 28747e4937aSGao Xiang return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ); 28847e4937aSGao Xiang } 28947e4937aSGao Xiang 2908a765682SGao Xiang static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit, 2918a765682SGao Xiang unsigned int bits) 29247e4937aSGao Xiang { 2938a765682SGao Xiang 2948a765682SGao Xiang return (value >> bit) & ((1 << bits) - 1); 29547e4937aSGao Xiang } 29647e4937aSGao Xiang 2978a765682SGao Xiang 2988a765682SGao Xiang static inline unsigned int erofs_inode_version(unsigned int value) 29947e4937aSGao Xiang { 3008a765682SGao Xiang return erofs_bitrange(value, EROFS_I_VERSION_BIT, 3018a765682SGao Xiang EROFS_I_VERSION_BITS); 3028a765682SGao Xiang } 3038a765682SGao Xiang 3048a765682SGao Xiang static inline unsigned int erofs_inode_datalayout(unsigned int value) 3058a765682SGao Xiang { 3068a765682SGao Xiang return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT, 3078a765682SGao Xiang EROFS_I_DATALAYOUT_BITS); 30847e4937aSGao Xiang } 30947e4937aSGao Xiang 31047e4937aSGao Xiang extern const struct super_operations erofs_sops; 31147e4937aSGao Xiang 31247e4937aSGao Xiang extern const struct address_space_operations erofs_raw_access_aops; 3130c638f70SGao Xiang extern const struct address_space_operations z_erofs_aops; 31447e4937aSGao Xiang 31547e4937aSGao Xiang /* 3168137824eSYue Hu * Logical to physical block mapping 31747e4937aSGao Xiang * 31847e4937aSGao Xiang * Different with other file systems, it is used for 2 access modes: 31947e4937aSGao Xiang * 32047e4937aSGao Xiang * 1) RAW access mode: 32147e4937aSGao Xiang * 32247e4937aSGao Xiang * Users pass a valid (m_lblk, m_lofs -- usually 0) pair, 32347e4937aSGao Xiang * and get the valid m_pblk, m_pofs and the longest m_len(in bytes). 32447e4937aSGao Xiang * 32547e4937aSGao Xiang * Note that m_lblk in the RAW access mode refers to the number of 32647e4937aSGao Xiang * the compressed ondisk block rather than the uncompressed 32747e4937aSGao Xiang * in-memory block for the compressed file. 32847e4937aSGao Xiang * 32947e4937aSGao Xiang * m_pofs equals to m_lofs except for the inline data page. 33047e4937aSGao Xiang * 33147e4937aSGao Xiang * 2) Normal access mode: 33247e4937aSGao Xiang * 33347e4937aSGao Xiang * If the inode is not compressed, it has no difference with 33447e4937aSGao Xiang * the RAW access mode. However, if the inode is compressed, 33547e4937aSGao Xiang * users should pass a valid (m_lblk, m_lofs) pair, and get 33647e4937aSGao Xiang * the needed m_pblk, m_pofs, m_len to get the compressed data 33747e4937aSGao Xiang * and the updated m_lblk, m_lofs which indicates the start 33847e4937aSGao Xiang * of the corresponding uncompressed data in the file. 33947e4937aSGao Xiang */ 34047e4937aSGao Xiang enum { 34147e4937aSGao Xiang BH_Zipped = BH_PrivateStart, 34247e4937aSGao Xiang BH_FullMapped, 34347e4937aSGao Xiang }; 34447e4937aSGao Xiang 34547e4937aSGao Xiang /* Has a disk mapping */ 34647e4937aSGao Xiang #define EROFS_MAP_MAPPED (1 << BH_Mapped) 34747e4937aSGao Xiang /* Located in metadata (could be copied from bd_inode) */ 34847e4937aSGao Xiang #define EROFS_MAP_META (1 << BH_Meta) 34947e4937aSGao Xiang /* The extent has been compressed */ 35047e4937aSGao Xiang #define EROFS_MAP_ZIPPED (1 << BH_Zipped) 35147e4937aSGao Xiang /* The length of extent is full */ 35247e4937aSGao Xiang #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) 35347e4937aSGao Xiang 35447e4937aSGao Xiang struct erofs_map_blocks { 35547e4937aSGao Xiang erofs_off_t m_pa, m_la; 35647e4937aSGao Xiang u64 m_plen, m_llen; 35747e4937aSGao Xiang 35847e4937aSGao Xiang unsigned int m_flags; 35947e4937aSGao Xiang 36047e4937aSGao Xiang struct page *mpage; 36147e4937aSGao Xiang }; 36247e4937aSGao Xiang 3638137824eSYue Hu /* Flags used by erofs_map_blocks_flatmode() */ 36447e4937aSGao Xiang #define EROFS_GET_BLOCKS_RAW 0x0001 365d95ae5e2SGao Xiang /* 366d95ae5e2SGao Xiang * Used to get the exact decompressed length, e.g. fiemap (consider lookback 367d95ae5e2SGao Xiang * approach instead if possible since it's more metadata lightweight.) 368d95ae5e2SGao Xiang */ 369d95ae5e2SGao Xiang #define EROFS_GET_BLOCKS_FIEMAP 0x0002 37047e4937aSGao Xiang 37147e4937aSGao Xiang /* zmap.c */ 372eadcd6b5SGao Xiang extern const struct iomap_ops z_erofs_iomap_report_ops; 373eadcd6b5SGao Xiang 37447e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 37547e4937aSGao Xiang int z_erofs_fill_inode(struct inode *inode); 37647e4937aSGao Xiang int z_erofs_map_blocks_iter(struct inode *inode, 37747e4937aSGao Xiang struct erofs_map_blocks *map, 37847e4937aSGao Xiang int flags); 37947e4937aSGao Xiang #else 38047e4937aSGao Xiang static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; } 38147e4937aSGao Xiang static inline int z_erofs_map_blocks_iter(struct inode *inode, 38247e4937aSGao Xiang struct erofs_map_blocks *map, 38347e4937aSGao Xiang int flags) 38447e4937aSGao Xiang { 38547e4937aSGao Xiang return -EOPNOTSUPP; 38647e4937aSGao Xiang } 38747e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 38847e4937aSGao Xiang 38947e4937aSGao Xiang /* data.c */ 390a08e67a0SHuang Jianan extern const struct file_operations erofs_file_fops; 391e655b5b3SGao Xiang struct page *erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr); 392eadcd6b5SGao Xiang int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 393eadcd6b5SGao Xiang u64 start, u64 len); 39447e4937aSGao Xiang 39547e4937aSGao Xiang /* inode.c */ 39647e4937aSGao Xiang static inline unsigned long erofs_inode_hash(erofs_nid_t nid) 39747e4937aSGao Xiang { 39847e4937aSGao Xiang #if BITS_PER_LONG == 32 39947e4937aSGao Xiang return (nid >> 32) ^ (nid & 0xffffffff); 40047e4937aSGao Xiang #else 40147e4937aSGao Xiang return nid; 40247e4937aSGao Xiang #endif 40347e4937aSGao Xiang } 40447e4937aSGao Xiang 40547e4937aSGao Xiang extern const struct inode_operations erofs_generic_iops; 40647e4937aSGao Xiang extern const struct inode_operations erofs_symlink_iops; 40747e4937aSGao Xiang extern const struct inode_operations erofs_fast_symlink_iops; 40847e4937aSGao Xiang 40947e4937aSGao Xiang struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir); 410549c7297SChristian Brauner int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path, 411549c7297SChristian Brauner struct kstat *stat, u32 request_mask, 412549c7297SChristian Brauner unsigned int query_flags); 41347e4937aSGao Xiang 41447e4937aSGao Xiang /* namei.c */ 41547e4937aSGao Xiang extern const struct inode_operations erofs_dir_iops; 41647e4937aSGao Xiang 41747e4937aSGao Xiang int erofs_namei(struct inode *dir, struct qstr *name, 41847e4937aSGao Xiang erofs_nid_t *nid, unsigned int *d_type); 41947e4937aSGao Xiang 42047e4937aSGao Xiang /* dir.c */ 42147e4937aSGao Xiang extern const struct file_operations erofs_dir_fops; 42247e4937aSGao Xiang 423598162d0SGao Xiang static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count) 424598162d0SGao Xiang { 425598162d0SGao Xiang int retried = 0; 426598162d0SGao Xiang 427598162d0SGao Xiang while (1) { 428598162d0SGao Xiang void *p = vm_map_ram(pages, count, -1); 429598162d0SGao Xiang 430598162d0SGao Xiang /* retry two more times (totally 3 times) */ 431598162d0SGao Xiang if (p || ++retried >= 3) 432598162d0SGao Xiang return p; 433598162d0SGao Xiang vm_unmap_aliases(); 434598162d0SGao Xiang } 435598162d0SGao Xiang return NULL; 436598162d0SGao Xiang } 437598162d0SGao Xiang 43852488734SGao Xiang /* pcpubuf.c */ 43952488734SGao Xiang void *erofs_get_pcpubuf(unsigned int requiredpages); 44052488734SGao Xiang void erofs_put_pcpubuf(void *ptr); 44152488734SGao Xiang int erofs_pcpubuf_growsize(unsigned int nrpages); 44252488734SGao Xiang void erofs_pcpubuf_init(void); 44352488734SGao Xiang void erofs_pcpubuf_exit(void); 44452488734SGao Xiang 44547e4937aSGao Xiang /* utils.c / zdata.c */ 4465ddcee1fSGao Xiang struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp); 44747e4937aSGao Xiang 44847e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 44947e4937aSGao Xiang int erofs_workgroup_put(struct erofs_workgroup *grp); 45047e4937aSGao Xiang struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, 451997626d8SVladimir Zapolskiy pgoff_t index); 45264094a04SGao Xiang struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb, 453e5e9a432SVladimir Zapolskiy struct erofs_workgroup *grp); 45447e4937aSGao Xiang void erofs_workgroup_free_rcu(struct erofs_workgroup *grp); 45547e4937aSGao Xiang void erofs_shrinker_register(struct super_block *sb); 45647e4937aSGao Xiang void erofs_shrinker_unregister(struct super_block *sb); 45747e4937aSGao Xiang int __init erofs_init_shrinker(void); 45847e4937aSGao Xiang void erofs_exit_shrinker(void); 45947e4937aSGao Xiang int __init z_erofs_init_zip_subsystem(void); 46047e4937aSGao Xiang void z_erofs_exit_zip_subsystem(void); 46147e4937aSGao Xiang int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 46247e4937aSGao Xiang struct erofs_workgroup *egrp); 463d252ff3dSYue Hu int erofs_try_to_free_cached_page(struct page *page); 4645d50538fSHuang Jianan int z_erofs_load_lz4_config(struct super_block *sb, 46546249cdeSGao Xiang struct erofs_super_block *dsb, 46646249cdeSGao Xiang struct z_erofs_lz4_cfgs *lz4, int len); 46747e4937aSGao Xiang #else 46847e4937aSGao Xiang static inline void erofs_shrinker_register(struct super_block *sb) {} 46947e4937aSGao Xiang static inline void erofs_shrinker_unregister(struct super_block *sb) {} 47047e4937aSGao Xiang static inline int erofs_init_shrinker(void) { return 0; } 47147e4937aSGao Xiang static inline void erofs_exit_shrinker(void) {} 47247e4937aSGao Xiang static inline int z_erofs_init_zip_subsystem(void) { return 0; } 47347e4937aSGao Xiang static inline void z_erofs_exit_zip_subsystem(void) {} 4745d50538fSHuang Jianan static inline int z_erofs_load_lz4_config(struct super_block *sb, 47546249cdeSGao Xiang struct erofs_super_block *dsb, 47646249cdeSGao Xiang struct z_erofs_lz4_cfgs *lz4, int len) 4775d50538fSHuang Jianan { 47814373711SGao Xiang if (lz4 || dsb->u1.lz4_max_distance) { 4795d50538fSHuang Jianan erofs_err(sb, "lz4 algorithm isn't enabled"); 4805d50538fSHuang Jianan return -EINVAL; 4815d50538fSHuang Jianan } 4825d50538fSHuang Jianan return 0; 4835d50538fSHuang Jianan } 48447e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 48547e4937aSGao Xiang 48647e4937aSGao Xiang #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 48747e4937aSGao Xiang 48847e4937aSGao Xiang #endif /* __EROFS_INTERNAL_H */ 489