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/ 5c5aa903aSGao 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 50dfeab2e9SGao Xiang struct erofs_device_info { 51dfeab2e9SGao Xiang char *path; 52dfeab2e9SGao Xiang struct block_device *bdev; 53dfeab2e9SGao Xiang struct dax_device *dax_dev; 54dfeab2e9SGao Xiang 55dfeab2e9SGao Xiang u32 blocks; 56dfeab2e9SGao Xiang u32 mapped_blkaddr; 57dfeab2e9SGao Xiang }; 58dfeab2e9SGao Xiang 59e6242465SGao Xiang struct erofs_mount_opts { 60f57a3fe4SChao Yu #ifdef CONFIG_EROFS_FS_ZIP 61f57a3fe4SChao Yu /* current strategy of how to use managed cache */ 62f57a3fe4SChao Yu unsigned char cache_strategy; 6330048cdaSHuang Jianan /* strategy of sync decompression (false - auto, true - force on) */ 6430048cdaSHuang Jianan bool readahead_sync_decompress; 65f57a3fe4SChao Yu 66f57a3fe4SChao Yu /* threshold for decompression synchronously */ 67f57a3fe4SChao Yu unsigned int max_sync_decompress_pages; 68f57a3fe4SChao Yu #endif 69f57a3fe4SChao Yu unsigned int mount_opt; 70f57a3fe4SChao Yu }; 71f57a3fe4SChao Yu 72dfeab2e9SGao Xiang struct erofs_dev_context { 73dfeab2e9SGao Xiang struct idr tree; 74dfeab2e9SGao Xiang struct rw_semaphore rwsem; 75dfeab2e9SGao Xiang 76dfeab2e9SGao Xiang unsigned int extra_devices; 77dfeab2e9SGao Xiang }; 78dfeab2e9SGao Xiang 79e6242465SGao Xiang struct erofs_fs_context { 80e6242465SGao Xiang struct erofs_mount_opts opt; 81dfeab2e9SGao Xiang struct erofs_dev_context *devs; 82e6242465SGao Xiang }; 83e6242465SGao Xiang 845d50538fSHuang Jianan /* all filesystem-wide lz4 configurations */ 855d50538fSHuang Jianan struct erofs_sb_lz4_info { 865d50538fSHuang Jianan /* # of pages needed for EROFS lz4 rolling decompression */ 875d50538fSHuang Jianan u16 max_distance_pages; 884fea63f7SGao Xiang /* maximum possible blocks for pclusters in the filesystem */ 894fea63f7SGao Xiang u16 max_pclusterblks; 905d50538fSHuang Jianan }; 915d50538fSHuang Jianan 9247e4937aSGao Xiang struct erofs_sb_info { 93e6242465SGao Xiang struct erofs_mount_opts opt; /* options */ 9447e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 9547e4937aSGao Xiang /* list for all registered superblocks, mainly for shrinker */ 9647e4937aSGao Xiang struct list_head list; 9747e4937aSGao Xiang struct mutex umount_mutex; 9847e4937aSGao Xiang 9964094a04SGao Xiang /* managed XArray arranged in physical block number */ 10064094a04SGao Xiang struct xarray managed_pslots; 10147e4937aSGao Xiang 10247e4937aSGao Xiang unsigned int shrinker_run_no; 10314373711SGao Xiang u16 available_compr_algs; 10447e4937aSGao Xiang 10547e4937aSGao Xiang /* pseudo inode to manage cached pages */ 10647e4937aSGao Xiang struct inode *managed_cache; 1075d50538fSHuang Jianan 1085d50538fSHuang Jianan struct erofs_sb_lz4_info lz4; 10947e4937aSGao Xiang #endif /* CONFIG_EROFS_FS_ZIP */ 110dfeab2e9SGao Xiang struct erofs_dev_context *devs; 11106252e9cSGao Xiang struct dax_device *dax_dev; 112dfeab2e9SGao Xiang u64 total_blocks; 113dfeab2e9SGao Xiang u32 primarydevice_blocks; 114dfeab2e9SGao Xiang 11547e4937aSGao Xiang u32 meta_blkaddr; 11647e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_XATTR 11747e4937aSGao Xiang u32 xattr_blkaddr; 11847e4937aSGao Xiang #endif 119dfeab2e9SGao Xiang u16 device_id_mask; /* valid bits of device id to be used */ 12047e4937aSGao Xiang 12147e4937aSGao Xiang /* inode slot unit size in bit shift */ 12247e4937aSGao Xiang unsigned char islotbits; 12347e4937aSGao Xiang 12414373711SGao Xiang u32 sb_size; /* total superblock size */ 12547e4937aSGao Xiang u32 build_time_nsec; 12647e4937aSGao Xiang u64 build_time; 12747e4937aSGao Xiang 12847e4937aSGao Xiang /* what we really care is nid, rather than ino.. */ 12947e4937aSGao Xiang erofs_nid_t root_nid; 13047e4937aSGao Xiang /* used for statfs, f_files - f_favail */ 13147e4937aSGao Xiang u64 inos; 13247e4937aSGao Xiang 13347e4937aSGao Xiang u8 uuid[16]; /* 128-bit uuid for volume */ 13447e4937aSGao Xiang u8 volume_name[16]; /* volume name */ 135b858a484SPratik Shinde u32 feature_compat; 136426a9308SGao Xiang u32 feature_incompat; 13747e4937aSGao Xiang }; 13847e4937aSGao Xiang 13947e4937aSGao Xiang #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) 14047e4937aSGao Xiang #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) 14147e4937aSGao Xiang 14247e4937aSGao Xiang /* Mount flags set via mount options or defaults */ 14347e4937aSGao Xiang #define EROFS_MOUNT_XATTR_USER 0x00000010 14447e4937aSGao Xiang #define EROFS_MOUNT_POSIX_ACL 0x00000020 14506252e9cSGao Xiang #define EROFS_MOUNT_DAX_ALWAYS 0x00000040 14606252e9cSGao Xiang #define EROFS_MOUNT_DAX_NEVER 0x00000080 14747e4937aSGao Xiang 148e6242465SGao Xiang #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option) 149e6242465SGao Xiang #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option) 150e6242465SGao Xiang #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option) 15147e4937aSGao Xiang 15247e4937aSGao Xiang enum { 15347e4937aSGao Xiang EROFS_ZIP_CACHE_DISABLED, 15447e4937aSGao Xiang EROFS_ZIP_CACHE_READAHEAD, 15547e4937aSGao Xiang EROFS_ZIP_CACHE_READAROUND 15647e4937aSGao Xiang }; 15747e4937aSGao Xiang 158f57a3fe4SChao Yu #ifdef CONFIG_EROFS_FS_ZIP 15947e4937aSGao Xiang #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL) 16047e4937aSGao Xiang 16147e4937aSGao Xiang /* basic unit of the workstation of a super_block */ 16247e4937aSGao Xiang struct erofs_workgroup { 16347e4937aSGao Xiang /* the workgroup index in the workstation */ 16447e4937aSGao Xiang pgoff_t index; 16547e4937aSGao Xiang 16647e4937aSGao Xiang /* overall workgroup reference count */ 16747e4937aSGao Xiang atomic_t refcount; 16847e4937aSGao Xiang }; 16947e4937aSGao Xiang 17047e4937aSGao Xiang #if defined(CONFIG_SMP) 17147e4937aSGao Xiang static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 17247e4937aSGao Xiang int val) 17347e4937aSGao Xiang { 17447e4937aSGao Xiang preempt_disable(); 17547e4937aSGao Xiang if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) { 17647e4937aSGao Xiang preempt_enable(); 17747e4937aSGao Xiang return false; 17847e4937aSGao Xiang } 17947e4937aSGao Xiang return true; 18047e4937aSGao Xiang } 18147e4937aSGao Xiang 18247e4937aSGao Xiang static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 18347e4937aSGao Xiang int orig_val) 18447e4937aSGao Xiang { 18547e4937aSGao Xiang /* 18647e4937aSGao Xiang * other observers should notice all modifications 18747e4937aSGao Xiang * in the freezing period. 18847e4937aSGao Xiang */ 18947e4937aSGao Xiang smp_mb(); 19047e4937aSGao Xiang atomic_set(&grp->refcount, orig_val); 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 return atomic_cond_read_relaxed(&grp->refcount, 19747e4937aSGao Xiang VAL != EROFS_LOCKED_MAGIC); 19847e4937aSGao Xiang } 19947e4937aSGao Xiang #else 20047e4937aSGao Xiang static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 20147e4937aSGao Xiang int val) 20247e4937aSGao Xiang { 20347e4937aSGao Xiang preempt_disable(); 20447e4937aSGao Xiang /* no need to spin on UP platforms, let's just disable preemption. */ 20547e4937aSGao Xiang if (val != atomic_read(&grp->refcount)) { 20647e4937aSGao Xiang preempt_enable(); 20747e4937aSGao Xiang return false; 20847e4937aSGao Xiang } 20947e4937aSGao Xiang return true; 21047e4937aSGao Xiang } 21147e4937aSGao Xiang 21247e4937aSGao Xiang static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 21347e4937aSGao Xiang int orig_val) 21447e4937aSGao Xiang { 21547e4937aSGao Xiang preempt_enable(); 21647e4937aSGao Xiang } 21747e4937aSGao Xiang 21847e4937aSGao Xiang static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 21947e4937aSGao Xiang { 22047e4937aSGao Xiang int v = atomic_read(&grp->refcount); 22147e4937aSGao Xiang 22247e4937aSGao Xiang /* workgroup is never freezed on uniprocessor systems */ 22347e4937aSGao Xiang DBG_BUGON(v == EROFS_LOCKED_MAGIC); 22447e4937aSGao Xiang return v; 22547e4937aSGao Xiang } 22647e4937aSGao Xiang #endif /* !CONFIG_SMP */ 22747e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 22847e4937aSGao Xiang 22947e4937aSGao Xiang /* we strictly follow PAGE_SIZE and no buffer head yet */ 23047e4937aSGao Xiang #define LOG_BLOCK_SIZE PAGE_SHIFT 23147e4937aSGao Xiang 23247e4937aSGao Xiang #undef LOG_SECTORS_PER_BLOCK 23347e4937aSGao Xiang #define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) 23447e4937aSGao Xiang 23547e4937aSGao Xiang #undef SECTORS_PER_BLOCK 23647e4937aSGao Xiang #define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK) 23747e4937aSGao Xiang 23847e4937aSGao Xiang #define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE) 23947e4937aSGao Xiang 24047e4937aSGao Xiang #if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ) 24147e4937aSGao Xiang #error erofs cannot be used in this platform 24247e4937aSGao Xiang #endif 24347e4937aSGao Xiang 24447e4937aSGao Xiang #define ROOT_NID(sb) ((sb)->root_nid) 24547e4937aSGao Xiang 24647e4937aSGao Xiang #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) 24747e4937aSGao Xiang #define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ) 24847e4937aSGao Xiang #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ) 24947e4937aSGao Xiang 25047e4937aSGao Xiang static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid) 25147e4937aSGao Xiang { 25247e4937aSGao Xiang return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits); 25347e4937aSGao Xiang } 25447e4937aSGao Xiang 255de06a6a3SGao Xiang #define EROFS_FEATURE_FUNCS(name, compat, feature) \ 256de06a6a3SGao Xiang static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \ 257de06a6a3SGao Xiang { \ 258de06a6a3SGao Xiang return sbi->feature_##compat & EROFS_FEATURE_##feature; \ 259de06a6a3SGao Xiang } 260de06a6a3SGao Xiang 261de06a6a3SGao Xiang EROFS_FEATURE_FUNCS(lz4_0padding, incompat, INCOMPAT_LZ4_0PADDING) 26214373711SGao Xiang EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS) 2635404c330SGao Xiang EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER) 264dfeab2e9SGao Xiang EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE) 265de06a6a3SGao Xiang EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) 266de06a6a3SGao Xiang 26747e4937aSGao Xiang /* atomic flag definitions */ 268a5876e24SGao Xiang #define EROFS_I_EA_INITED_BIT 0 269a5876e24SGao Xiang #define EROFS_I_Z_INITED_BIT 1 27047e4937aSGao Xiang 27147e4937aSGao Xiang /* bitlock definitions (arranged in reverse order) */ 272a5876e24SGao Xiang #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) 273a5876e24SGao Xiang #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) 27447e4937aSGao Xiang 275a5876e24SGao Xiang struct erofs_inode { 27647e4937aSGao Xiang erofs_nid_t nid; 27747e4937aSGao Xiang 27847e4937aSGao Xiang /* atomic flags (including bitlocks) */ 27947e4937aSGao Xiang unsigned long flags; 28047e4937aSGao Xiang 2818a765682SGao Xiang unsigned char datalayout; 28247e4937aSGao Xiang unsigned char inode_isize; 28347e4937aSGao Xiang unsigned short xattr_isize; 28447e4937aSGao Xiang 28547e4937aSGao Xiang unsigned int xattr_shared_count; 28647e4937aSGao Xiang unsigned int *xattr_shared_xattrs; 28747e4937aSGao Xiang 28847e4937aSGao Xiang union { 28947e4937aSGao Xiang erofs_blk_t raw_blkaddr; 290c5aa903aSGao Xiang struct { 291c5aa903aSGao Xiang unsigned short chunkformat; 292c5aa903aSGao Xiang unsigned char chunkbits; 293c5aa903aSGao Xiang }; 29447e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 29547e4937aSGao Xiang struct { 29647e4937aSGao Xiang unsigned short z_advise; 29747e4937aSGao Xiang unsigned char z_algorithmtype[2]; 29847e4937aSGao Xiang unsigned char z_logical_clusterbits; 29947e4937aSGao Xiang }; 30047e4937aSGao Xiang #endif /* CONFIG_EROFS_FS_ZIP */ 30147e4937aSGao Xiang }; 30247e4937aSGao Xiang /* the corresponding vfs inode */ 30347e4937aSGao Xiang struct inode vfs_inode; 30447e4937aSGao Xiang }; 30547e4937aSGao Xiang 306a5876e24SGao Xiang #define EROFS_I(ptr) \ 307a5876e24SGao Xiang container_of(ptr, struct erofs_inode, vfs_inode) 30847e4937aSGao Xiang 30999634bf3SGao Xiang static inline unsigned long erofs_inode_datablocks(struct inode *inode) 31047e4937aSGao Xiang { 31147e4937aSGao Xiang /* since i_size cannot be changed */ 31247e4937aSGao Xiang return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ); 31347e4937aSGao Xiang } 31447e4937aSGao Xiang 3158a765682SGao Xiang static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit, 3168a765682SGao Xiang unsigned int bits) 31747e4937aSGao Xiang { 3188a765682SGao Xiang 3198a765682SGao Xiang return (value >> bit) & ((1 << bits) - 1); 32047e4937aSGao Xiang } 32147e4937aSGao Xiang 3228a765682SGao Xiang 3238a765682SGao Xiang static inline unsigned int erofs_inode_version(unsigned int value) 32447e4937aSGao Xiang { 3258a765682SGao Xiang return erofs_bitrange(value, EROFS_I_VERSION_BIT, 3268a765682SGao Xiang EROFS_I_VERSION_BITS); 3278a765682SGao Xiang } 3288a765682SGao Xiang 3298a765682SGao Xiang static inline unsigned int erofs_inode_datalayout(unsigned int value) 3308a765682SGao Xiang { 3318a765682SGao Xiang return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT, 3328a765682SGao Xiang EROFS_I_DATALAYOUT_BITS); 33347e4937aSGao Xiang } 33447e4937aSGao Xiang 33547e4937aSGao Xiang extern const struct super_operations erofs_sops; 33647e4937aSGao Xiang 33747e4937aSGao Xiang extern const struct address_space_operations erofs_raw_access_aops; 3380c638f70SGao Xiang extern const struct address_space_operations z_erofs_aops; 33947e4937aSGao Xiang 34047e4937aSGao Xiang /* 3418137824eSYue Hu * Logical to physical block mapping 34247e4937aSGao Xiang * 34347e4937aSGao Xiang * Different with other file systems, it is used for 2 access modes: 34447e4937aSGao Xiang * 34547e4937aSGao Xiang * 1) RAW access mode: 34647e4937aSGao Xiang * 34747e4937aSGao Xiang * Users pass a valid (m_lblk, m_lofs -- usually 0) pair, 34847e4937aSGao Xiang * and get the valid m_pblk, m_pofs and the longest m_len(in bytes). 34947e4937aSGao Xiang * 35047e4937aSGao Xiang * Note that m_lblk in the RAW access mode refers to the number of 35147e4937aSGao Xiang * the compressed ondisk block rather than the uncompressed 35247e4937aSGao Xiang * in-memory block for the compressed file. 35347e4937aSGao Xiang * 35447e4937aSGao Xiang * m_pofs equals to m_lofs except for the inline data page. 35547e4937aSGao Xiang * 35647e4937aSGao Xiang * 2) Normal access mode: 35747e4937aSGao Xiang * 35847e4937aSGao Xiang * If the inode is not compressed, it has no difference with 35947e4937aSGao Xiang * the RAW access mode. However, if the inode is compressed, 36047e4937aSGao Xiang * users should pass a valid (m_lblk, m_lofs) pair, and get 36147e4937aSGao Xiang * the needed m_pblk, m_pofs, m_len to get the compressed data 36247e4937aSGao Xiang * and the updated m_lblk, m_lofs which indicates the start 36347e4937aSGao Xiang * of the corresponding uncompressed data in the file. 36447e4937aSGao Xiang */ 36547e4937aSGao Xiang enum { 366*8f899262SGao Xiang BH_Encoded = BH_PrivateStart, 36747e4937aSGao Xiang BH_FullMapped, 36847e4937aSGao Xiang }; 36947e4937aSGao Xiang 37047e4937aSGao Xiang /* Has a disk mapping */ 37147e4937aSGao Xiang #define EROFS_MAP_MAPPED (1 << BH_Mapped) 37247e4937aSGao Xiang /* Located in metadata (could be copied from bd_inode) */ 37347e4937aSGao Xiang #define EROFS_MAP_META (1 << BH_Meta) 374*8f899262SGao Xiang /* The extent is encoded */ 375*8f899262SGao Xiang #define EROFS_MAP_ENCODED (1 << BH_Encoded) 37647e4937aSGao Xiang /* The length of extent is full */ 37747e4937aSGao Xiang #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) 37847e4937aSGao Xiang 37947e4937aSGao Xiang struct erofs_map_blocks { 38047e4937aSGao Xiang erofs_off_t m_pa, m_la; 38147e4937aSGao Xiang u64 m_plen, m_llen; 38247e4937aSGao Xiang 383dfeab2e9SGao Xiang unsigned short m_deviceid; 384*8f899262SGao Xiang char m_algorithmformat; 38547e4937aSGao Xiang unsigned int m_flags; 38647e4937aSGao Xiang 38747e4937aSGao Xiang struct page *mpage; 38847e4937aSGao Xiang }; 38947e4937aSGao Xiang 3908137824eSYue Hu /* Flags used by erofs_map_blocks_flatmode() */ 39147e4937aSGao Xiang #define EROFS_GET_BLOCKS_RAW 0x0001 392d95ae5e2SGao Xiang /* 393d95ae5e2SGao Xiang * Used to get the exact decompressed length, e.g. fiemap (consider lookback 394d95ae5e2SGao Xiang * approach instead if possible since it's more metadata lightweight.) 395d95ae5e2SGao Xiang */ 396d95ae5e2SGao Xiang #define EROFS_GET_BLOCKS_FIEMAP 0x0002 39747e4937aSGao Xiang 398*8f899262SGao Xiang enum { 399*8f899262SGao Xiang Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX, 400*8f899262SGao Xiang Z_EROFS_COMPRESSION_RUNTIME_MAX 401*8f899262SGao Xiang }; 402*8f899262SGao Xiang 40347e4937aSGao Xiang /* zmap.c */ 404eadcd6b5SGao Xiang extern const struct iomap_ops z_erofs_iomap_report_ops; 405eadcd6b5SGao Xiang 40647e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 40747e4937aSGao Xiang int z_erofs_fill_inode(struct inode *inode); 40847e4937aSGao Xiang int z_erofs_map_blocks_iter(struct inode *inode, 40947e4937aSGao Xiang struct erofs_map_blocks *map, 41047e4937aSGao Xiang int flags); 41147e4937aSGao Xiang #else 41247e4937aSGao Xiang static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; } 41347e4937aSGao Xiang static inline int z_erofs_map_blocks_iter(struct inode *inode, 41447e4937aSGao Xiang struct erofs_map_blocks *map, 41547e4937aSGao Xiang int flags) 41647e4937aSGao Xiang { 41747e4937aSGao Xiang return -EOPNOTSUPP; 41847e4937aSGao Xiang } 41947e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 42047e4937aSGao Xiang 421dfeab2e9SGao Xiang struct erofs_map_dev { 422dfeab2e9SGao Xiang struct block_device *m_bdev; 423dfeab2e9SGao Xiang struct dax_device *m_daxdev; 424dfeab2e9SGao Xiang 425dfeab2e9SGao Xiang erofs_off_t m_pa; 426dfeab2e9SGao Xiang unsigned int m_deviceid; 427dfeab2e9SGao Xiang }; 428dfeab2e9SGao Xiang 42947e4937aSGao Xiang /* data.c */ 430a08e67a0SHuang Jianan extern const struct file_operations erofs_file_fops; 431e655b5b3SGao Xiang struct page *erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr); 432dfeab2e9SGao Xiang int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev); 433eadcd6b5SGao Xiang int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 434eadcd6b5SGao Xiang u64 start, u64 len); 43547e4937aSGao Xiang 43647e4937aSGao Xiang /* inode.c */ 43747e4937aSGao Xiang static inline unsigned long erofs_inode_hash(erofs_nid_t nid) 43847e4937aSGao Xiang { 43947e4937aSGao Xiang #if BITS_PER_LONG == 32 44047e4937aSGao Xiang return (nid >> 32) ^ (nid & 0xffffffff); 44147e4937aSGao Xiang #else 44247e4937aSGao Xiang return nid; 44347e4937aSGao Xiang #endif 44447e4937aSGao Xiang } 44547e4937aSGao Xiang 44647e4937aSGao Xiang extern const struct inode_operations erofs_generic_iops; 44747e4937aSGao Xiang extern const struct inode_operations erofs_symlink_iops; 44847e4937aSGao Xiang extern const struct inode_operations erofs_fast_symlink_iops; 44947e4937aSGao Xiang 45047e4937aSGao Xiang struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir); 451549c7297SChristian Brauner int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path, 452549c7297SChristian Brauner struct kstat *stat, u32 request_mask, 453549c7297SChristian Brauner unsigned int query_flags); 45447e4937aSGao Xiang 45547e4937aSGao Xiang /* namei.c */ 45647e4937aSGao Xiang extern const struct inode_operations erofs_dir_iops; 45747e4937aSGao Xiang 45847e4937aSGao Xiang int erofs_namei(struct inode *dir, struct qstr *name, 45947e4937aSGao Xiang erofs_nid_t *nid, unsigned int *d_type); 46047e4937aSGao Xiang 46147e4937aSGao Xiang /* dir.c */ 46247e4937aSGao Xiang extern const struct file_operations erofs_dir_fops; 46347e4937aSGao Xiang 464598162d0SGao Xiang static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count) 465598162d0SGao Xiang { 466598162d0SGao Xiang int retried = 0; 467598162d0SGao Xiang 468598162d0SGao Xiang while (1) { 469598162d0SGao Xiang void *p = vm_map_ram(pages, count, -1); 470598162d0SGao Xiang 471598162d0SGao Xiang /* retry two more times (totally 3 times) */ 472598162d0SGao Xiang if (p || ++retried >= 3) 473598162d0SGao Xiang return p; 474598162d0SGao Xiang vm_unmap_aliases(); 475598162d0SGao Xiang } 476598162d0SGao Xiang return NULL; 477598162d0SGao Xiang } 478598162d0SGao Xiang 47952488734SGao Xiang /* pcpubuf.c */ 48052488734SGao Xiang void *erofs_get_pcpubuf(unsigned int requiredpages); 48152488734SGao Xiang void erofs_put_pcpubuf(void *ptr); 48252488734SGao Xiang int erofs_pcpubuf_growsize(unsigned int nrpages); 48352488734SGao Xiang void erofs_pcpubuf_init(void); 48452488734SGao Xiang void erofs_pcpubuf_exit(void); 48552488734SGao Xiang 48647e4937aSGao Xiang /* utils.c / zdata.c */ 4875ddcee1fSGao Xiang struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp); 48847e4937aSGao Xiang 48947e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 49047e4937aSGao Xiang int erofs_workgroup_put(struct erofs_workgroup *grp); 49147e4937aSGao Xiang struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, 492997626d8SVladimir Zapolskiy pgoff_t index); 49364094a04SGao Xiang struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb, 494e5e9a432SVladimir Zapolskiy struct erofs_workgroup *grp); 49547e4937aSGao Xiang void erofs_workgroup_free_rcu(struct erofs_workgroup *grp); 49647e4937aSGao Xiang void erofs_shrinker_register(struct super_block *sb); 49747e4937aSGao Xiang void erofs_shrinker_unregister(struct super_block *sb); 49847e4937aSGao Xiang int __init erofs_init_shrinker(void); 49947e4937aSGao Xiang void erofs_exit_shrinker(void); 50047e4937aSGao Xiang int __init z_erofs_init_zip_subsystem(void); 50147e4937aSGao Xiang void z_erofs_exit_zip_subsystem(void); 50247e4937aSGao Xiang int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 50347e4937aSGao Xiang struct erofs_workgroup *egrp); 504d252ff3dSYue Hu int erofs_try_to_free_cached_page(struct page *page); 5055d50538fSHuang Jianan int z_erofs_load_lz4_config(struct super_block *sb, 50646249cdeSGao Xiang struct erofs_super_block *dsb, 50746249cdeSGao Xiang struct z_erofs_lz4_cfgs *lz4, int len); 50847e4937aSGao Xiang #else 50947e4937aSGao Xiang static inline void erofs_shrinker_register(struct super_block *sb) {} 51047e4937aSGao Xiang static inline void erofs_shrinker_unregister(struct super_block *sb) {} 51147e4937aSGao Xiang static inline int erofs_init_shrinker(void) { return 0; } 51247e4937aSGao Xiang static inline void erofs_exit_shrinker(void) {} 51347e4937aSGao Xiang static inline int z_erofs_init_zip_subsystem(void) { return 0; } 51447e4937aSGao Xiang static inline void z_erofs_exit_zip_subsystem(void) {} 5155d50538fSHuang Jianan static inline int z_erofs_load_lz4_config(struct super_block *sb, 51646249cdeSGao Xiang struct erofs_super_block *dsb, 51746249cdeSGao Xiang struct z_erofs_lz4_cfgs *lz4, int len) 5185d50538fSHuang Jianan { 51914373711SGao Xiang if (lz4 || dsb->u1.lz4_max_distance) { 5205d50538fSHuang Jianan erofs_err(sb, "lz4 algorithm isn't enabled"); 5215d50538fSHuang Jianan return -EINVAL; 5225d50538fSHuang Jianan } 5235d50538fSHuang Jianan return 0; 5245d50538fSHuang Jianan } 52547e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 52647e4937aSGao Xiang 52747e4937aSGao Xiang #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 52847e4937aSGao Xiang 52947e4937aSGao Xiang #endif /* __EROFS_INTERNAL_H */ 530