147e4937aSGao Xiang /* SPDX-License-Identifier: GPL-2.0-only */ 247e4937aSGao Xiang /* 347e4937aSGao Xiang * Copyright (C) 2017-2018 HUAWEI, Inc. 447e4937aSGao Xiang * http://www.huawei.com/ 547e4937aSGao Xiang * Created by Gao Xiang <gaoxiang25@huawei.com> 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> 1947e4937aSGao Xiang #include "erofs_fs.h" 2047e4937aSGao Xiang 2147e4937aSGao Xiang /* redefine pr_fmt "erofs: " */ 2247e4937aSGao Xiang #undef pr_fmt 2347e4937aSGao Xiang #define pr_fmt(fmt) "erofs: " fmt 2447e4937aSGao Xiang 254f761fa2SGao Xiang __printf(3, 4) void _erofs_err(struct super_block *sb, 264f761fa2SGao Xiang const char *function, const char *fmt, ...); 274f761fa2SGao Xiang #define erofs_err(sb, fmt, ...) \ 284f761fa2SGao Xiang _erofs_err(sb, __func__, fmt "\n", ##__VA_ARGS__) 294f761fa2SGao Xiang __printf(3, 4) void _erofs_info(struct super_block *sb, 304f761fa2SGao Xiang const char *function, const char *fmt, ...); 314f761fa2SGao Xiang #define erofs_info(sb, fmt, ...) \ 324f761fa2SGao Xiang _erofs_info(sb, __func__, fmt "\n", ##__VA_ARGS__) 3347e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_DEBUG 344f761fa2SGao Xiang #define erofs_dbg(x, ...) pr_debug(x "\n", ##__VA_ARGS__) 3547e4937aSGao Xiang #define DBG_BUGON BUG_ON 3647e4937aSGao Xiang #else 374f761fa2SGao Xiang #define erofs_dbg(x, ...) ((void)0) 3847e4937aSGao Xiang #define DBG_BUGON(x) ((void)(x)) 3947e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_DEBUG */ 4047e4937aSGao Xiang 4147e4937aSGao Xiang /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */ 4247e4937aSGao Xiang #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1 4347e4937aSGao Xiang 4447e4937aSGao Xiang typedef u64 erofs_nid_t; 4547e4937aSGao Xiang typedef u64 erofs_off_t; 4647e4937aSGao Xiang /* data type for filesystem-wide blocks number */ 4747e4937aSGao Xiang typedef u32 erofs_blk_t; 4847e4937aSGao Xiang 4947e4937aSGao Xiang struct erofs_sb_info { 5047e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 5147e4937aSGao Xiang /* list for all registered superblocks, mainly for shrinker */ 5247e4937aSGao Xiang struct list_head list; 5347e4937aSGao Xiang struct mutex umount_mutex; 5447e4937aSGao Xiang 5547e4937aSGao Xiang /* the dedicated workstation for compression */ 5647e4937aSGao Xiang struct radix_tree_root workstn_tree; 5747e4937aSGao Xiang 5847e4937aSGao Xiang /* threshold for decompression synchronously */ 5947e4937aSGao Xiang unsigned int max_sync_decompress_pages; 6047e4937aSGao Xiang 6147e4937aSGao Xiang unsigned int shrinker_run_no; 6247e4937aSGao Xiang 6347e4937aSGao Xiang /* current strategy of how to use managed cache */ 6447e4937aSGao Xiang unsigned char cache_strategy; 6547e4937aSGao Xiang 6647e4937aSGao Xiang /* pseudo inode to manage cached pages */ 6747e4937aSGao Xiang struct inode *managed_cache; 6847e4937aSGao Xiang #endif /* CONFIG_EROFS_FS_ZIP */ 6947e4937aSGao Xiang u32 blocks; 7047e4937aSGao Xiang u32 meta_blkaddr; 7147e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_XATTR 7247e4937aSGao Xiang u32 xattr_blkaddr; 7347e4937aSGao Xiang #endif 7447e4937aSGao Xiang 7547e4937aSGao Xiang /* inode slot unit size in bit shift */ 7647e4937aSGao Xiang unsigned char islotbits; 7747e4937aSGao Xiang 7847e4937aSGao Xiang u32 build_time_nsec; 7947e4937aSGao Xiang u64 build_time; 8047e4937aSGao Xiang 8147e4937aSGao Xiang /* what we really care is nid, rather than ino.. */ 8247e4937aSGao Xiang erofs_nid_t root_nid; 8347e4937aSGao Xiang /* used for statfs, f_files - f_favail */ 8447e4937aSGao Xiang u64 inos; 8547e4937aSGao Xiang 8647e4937aSGao Xiang u8 uuid[16]; /* 128-bit uuid for volume */ 8747e4937aSGao Xiang u8 volume_name[16]; /* volume name */ 88b858a484SPratik Shinde u32 feature_compat; 89426a9308SGao Xiang u32 feature_incompat; 9047e4937aSGao Xiang 9147e4937aSGao Xiang unsigned int mount_opt; 9247e4937aSGao Xiang }; 9347e4937aSGao Xiang 9447e4937aSGao Xiang #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) 9547e4937aSGao Xiang #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) 9647e4937aSGao Xiang 9747e4937aSGao Xiang /* Mount flags set via mount options or defaults */ 9847e4937aSGao Xiang #define EROFS_MOUNT_XATTR_USER 0x00000010 9947e4937aSGao Xiang #define EROFS_MOUNT_POSIX_ACL 0x00000020 10047e4937aSGao Xiang 10147e4937aSGao Xiang #define clear_opt(sbi, option) ((sbi)->mount_opt &= ~EROFS_MOUNT_##option) 10247e4937aSGao Xiang #define set_opt(sbi, option) ((sbi)->mount_opt |= EROFS_MOUNT_##option) 10347e4937aSGao Xiang #define test_opt(sbi, option) ((sbi)->mount_opt & EROFS_MOUNT_##option) 10447e4937aSGao Xiang 10547e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 10647e4937aSGao Xiang enum { 10747e4937aSGao Xiang EROFS_ZIP_CACHE_DISABLED, 10847e4937aSGao Xiang EROFS_ZIP_CACHE_READAHEAD, 10947e4937aSGao Xiang EROFS_ZIP_CACHE_READAROUND 11047e4937aSGao Xiang }; 11147e4937aSGao Xiang 11247e4937aSGao Xiang #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL) 11347e4937aSGao Xiang 11447e4937aSGao Xiang /* basic unit of the workstation of a super_block */ 11547e4937aSGao Xiang struct erofs_workgroup { 11647e4937aSGao Xiang /* the workgroup index in the workstation */ 11747e4937aSGao Xiang pgoff_t index; 11847e4937aSGao Xiang 11947e4937aSGao Xiang /* overall workgroup reference count */ 12047e4937aSGao Xiang atomic_t refcount; 12147e4937aSGao Xiang }; 12247e4937aSGao Xiang 12347e4937aSGao Xiang #if defined(CONFIG_SMP) 12447e4937aSGao Xiang static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 12547e4937aSGao Xiang int val) 12647e4937aSGao Xiang { 12747e4937aSGao Xiang preempt_disable(); 12847e4937aSGao Xiang if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) { 12947e4937aSGao Xiang preempt_enable(); 13047e4937aSGao Xiang return false; 13147e4937aSGao Xiang } 13247e4937aSGao Xiang return true; 13347e4937aSGao Xiang } 13447e4937aSGao Xiang 13547e4937aSGao Xiang static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 13647e4937aSGao Xiang int orig_val) 13747e4937aSGao Xiang { 13847e4937aSGao Xiang /* 13947e4937aSGao Xiang * other observers should notice all modifications 14047e4937aSGao Xiang * in the freezing period. 14147e4937aSGao Xiang */ 14247e4937aSGao Xiang smp_mb(); 14347e4937aSGao Xiang atomic_set(&grp->refcount, orig_val); 14447e4937aSGao Xiang preempt_enable(); 14547e4937aSGao Xiang } 14647e4937aSGao Xiang 14747e4937aSGao Xiang static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 14847e4937aSGao Xiang { 14947e4937aSGao Xiang return atomic_cond_read_relaxed(&grp->refcount, 15047e4937aSGao Xiang VAL != EROFS_LOCKED_MAGIC); 15147e4937aSGao Xiang } 15247e4937aSGao Xiang #else 15347e4937aSGao Xiang static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 15447e4937aSGao Xiang int val) 15547e4937aSGao Xiang { 15647e4937aSGao Xiang preempt_disable(); 15747e4937aSGao Xiang /* no need to spin on UP platforms, let's just disable preemption. */ 15847e4937aSGao Xiang if (val != atomic_read(&grp->refcount)) { 15947e4937aSGao Xiang preempt_enable(); 16047e4937aSGao Xiang return false; 16147e4937aSGao Xiang } 16247e4937aSGao Xiang return true; 16347e4937aSGao Xiang } 16447e4937aSGao Xiang 16547e4937aSGao Xiang static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 16647e4937aSGao Xiang int orig_val) 16747e4937aSGao Xiang { 16847e4937aSGao Xiang preempt_enable(); 16947e4937aSGao Xiang } 17047e4937aSGao Xiang 17147e4937aSGao Xiang static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 17247e4937aSGao Xiang { 17347e4937aSGao Xiang int v = atomic_read(&grp->refcount); 17447e4937aSGao Xiang 17547e4937aSGao Xiang /* workgroup is never freezed on uniprocessor systems */ 17647e4937aSGao Xiang DBG_BUGON(v == EROFS_LOCKED_MAGIC); 17747e4937aSGao Xiang return v; 17847e4937aSGao Xiang } 17947e4937aSGao Xiang #endif /* !CONFIG_SMP */ 18047e4937aSGao Xiang 18147e4937aSGao Xiang /* hard limit of pages per compressed cluster */ 18247e4937aSGao Xiang #define Z_EROFS_CLUSTER_MAX_PAGES (CONFIG_EROFS_FS_CLUSTER_PAGE_LIMIT) 18347e4937aSGao Xiang #define EROFS_PCPUBUF_NR_PAGES Z_EROFS_CLUSTER_MAX_PAGES 18447e4937aSGao Xiang #else 18547e4937aSGao Xiang #define EROFS_PCPUBUF_NR_PAGES 0 18647e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 18747e4937aSGao Xiang 18847e4937aSGao Xiang /* we strictly follow PAGE_SIZE and no buffer head yet */ 18947e4937aSGao Xiang #define LOG_BLOCK_SIZE PAGE_SHIFT 19047e4937aSGao Xiang 19147e4937aSGao Xiang #undef LOG_SECTORS_PER_BLOCK 19247e4937aSGao Xiang #define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) 19347e4937aSGao Xiang 19447e4937aSGao Xiang #undef SECTORS_PER_BLOCK 19547e4937aSGao Xiang #define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK) 19647e4937aSGao Xiang 19747e4937aSGao Xiang #define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE) 19847e4937aSGao Xiang 19947e4937aSGao Xiang #if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ) 20047e4937aSGao Xiang #error erofs cannot be used in this platform 20147e4937aSGao Xiang #endif 20247e4937aSGao Xiang 20347e4937aSGao Xiang #define ROOT_NID(sb) ((sb)->root_nid) 20447e4937aSGao Xiang 20547e4937aSGao Xiang #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) 20647e4937aSGao Xiang #define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ) 20747e4937aSGao Xiang #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ) 20847e4937aSGao Xiang 20947e4937aSGao Xiang static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid) 21047e4937aSGao Xiang { 21147e4937aSGao Xiang return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits); 21247e4937aSGao Xiang } 21347e4937aSGao Xiang 21447e4937aSGao Xiang /* atomic flag definitions */ 215a5876e24SGao Xiang #define EROFS_I_EA_INITED_BIT 0 216a5876e24SGao Xiang #define EROFS_I_Z_INITED_BIT 1 21747e4937aSGao Xiang 21847e4937aSGao Xiang /* bitlock definitions (arranged in reverse order) */ 219a5876e24SGao Xiang #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) 220a5876e24SGao Xiang #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) 22147e4937aSGao Xiang 222a5876e24SGao Xiang struct erofs_inode { 22347e4937aSGao Xiang erofs_nid_t nid; 22447e4937aSGao Xiang 22547e4937aSGao Xiang /* atomic flags (including bitlocks) */ 22647e4937aSGao Xiang unsigned long flags; 22747e4937aSGao Xiang 2288a765682SGao Xiang unsigned char datalayout; 22947e4937aSGao Xiang unsigned char inode_isize; 23047e4937aSGao Xiang unsigned short xattr_isize; 23147e4937aSGao Xiang 23247e4937aSGao Xiang unsigned int xattr_shared_count; 23347e4937aSGao Xiang unsigned int *xattr_shared_xattrs; 23447e4937aSGao Xiang 23547e4937aSGao Xiang union { 23647e4937aSGao Xiang erofs_blk_t raw_blkaddr; 23747e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 23847e4937aSGao Xiang struct { 23947e4937aSGao Xiang unsigned short z_advise; 24047e4937aSGao Xiang unsigned char z_algorithmtype[2]; 24147e4937aSGao Xiang unsigned char z_logical_clusterbits; 24247e4937aSGao Xiang unsigned char z_physical_clusterbits[2]; 24347e4937aSGao Xiang }; 24447e4937aSGao Xiang #endif /* CONFIG_EROFS_FS_ZIP */ 24547e4937aSGao Xiang }; 24647e4937aSGao Xiang /* the corresponding vfs inode */ 24747e4937aSGao Xiang struct inode vfs_inode; 24847e4937aSGao Xiang }; 24947e4937aSGao Xiang 250a5876e24SGao Xiang #define EROFS_I(ptr) \ 251a5876e24SGao Xiang container_of(ptr, struct erofs_inode, vfs_inode) 25247e4937aSGao Xiang 25399634bf3SGao Xiang static inline unsigned long erofs_inode_datablocks(struct inode *inode) 25447e4937aSGao Xiang { 25547e4937aSGao Xiang /* since i_size cannot be changed */ 25647e4937aSGao Xiang return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ); 25747e4937aSGao Xiang } 25847e4937aSGao Xiang 2598a765682SGao Xiang static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit, 2608a765682SGao Xiang unsigned int bits) 26147e4937aSGao Xiang { 2628a765682SGao Xiang 2638a765682SGao Xiang return (value >> bit) & ((1 << bits) - 1); 26447e4937aSGao Xiang } 26547e4937aSGao Xiang 2668a765682SGao Xiang 2678a765682SGao Xiang static inline unsigned int erofs_inode_version(unsigned int value) 26847e4937aSGao Xiang { 2698a765682SGao Xiang return erofs_bitrange(value, EROFS_I_VERSION_BIT, 2708a765682SGao Xiang EROFS_I_VERSION_BITS); 2718a765682SGao Xiang } 2728a765682SGao Xiang 2738a765682SGao Xiang static inline unsigned int erofs_inode_datalayout(unsigned int value) 2748a765682SGao Xiang { 2758a765682SGao Xiang return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT, 2768a765682SGao Xiang EROFS_I_DATALAYOUT_BITS); 27747e4937aSGao Xiang } 27847e4937aSGao Xiang 27947e4937aSGao Xiang extern const struct super_operations erofs_sops; 28047e4937aSGao Xiang 28147e4937aSGao Xiang extern const struct address_space_operations erofs_raw_access_aops; 28247e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 28347e4937aSGao Xiang extern const struct address_space_operations z_erofs_vle_normalaccess_aops; 28447e4937aSGao Xiang #endif 28547e4937aSGao Xiang 28647e4937aSGao Xiang /* 28747e4937aSGao Xiang * Logical to physical block mapping, used by erofs_map_blocks() 28847e4937aSGao Xiang * 28947e4937aSGao Xiang * Different with other file systems, it is used for 2 access modes: 29047e4937aSGao Xiang * 29147e4937aSGao Xiang * 1) RAW access mode: 29247e4937aSGao Xiang * 29347e4937aSGao Xiang * Users pass a valid (m_lblk, m_lofs -- usually 0) pair, 29447e4937aSGao Xiang * and get the valid m_pblk, m_pofs and the longest m_len(in bytes). 29547e4937aSGao Xiang * 29647e4937aSGao Xiang * Note that m_lblk in the RAW access mode refers to the number of 29747e4937aSGao Xiang * the compressed ondisk block rather than the uncompressed 29847e4937aSGao Xiang * in-memory block for the compressed file. 29947e4937aSGao Xiang * 30047e4937aSGao Xiang * m_pofs equals to m_lofs except for the inline data page. 30147e4937aSGao Xiang * 30247e4937aSGao Xiang * 2) Normal access mode: 30347e4937aSGao Xiang * 30447e4937aSGao Xiang * If the inode is not compressed, it has no difference with 30547e4937aSGao Xiang * the RAW access mode. However, if the inode is compressed, 30647e4937aSGao Xiang * users should pass a valid (m_lblk, m_lofs) pair, and get 30747e4937aSGao Xiang * the needed m_pblk, m_pofs, m_len to get the compressed data 30847e4937aSGao Xiang * and the updated m_lblk, m_lofs which indicates the start 30947e4937aSGao Xiang * of the corresponding uncompressed data in the file. 31047e4937aSGao Xiang */ 31147e4937aSGao Xiang enum { 31247e4937aSGao Xiang BH_Zipped = BH_PrivateStart, 31347e4937aSGao Xiang BH_FullMapped, 31447e4937aSGao Xiang }; 31547e4937aSGao Xiang 31647e4937aSGao Xiang /* Has a disk mapping */ 31747e4937aSGao Xiang #define EROFS_MAP_MAPPED (1 << BH_Mapped) 31847e4937aSGao Xiang /* Located in metadata (could be copied from bd_inode) */ 31947e4937aSGao Xiang #define EROFS_MAP_META (1 << BH_Meta) 32047e4937aSGao Xiang /* The extent has been compressed */ 32147e4937aSGao Xiang #define EROFS_MAP_ZIPPED (1 << BH_Zipped) 32247e4937aSGao Xiang /* The length of extent is full */ 32347e4937aSGao Xiang #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) 32447e4937aSGao Xiang 32547e4937aSGao Xiang struct erofs_map_blocks { 32647e4937aSGao Xiang erofs_off_t m_pa, m_la; 32747e4937aSGao Xiang u64 m_plen, m_llen; 32847e4937aSGao Xiang 32947e4937aSGao Xiang unsigned int m_flags; 33047e4937aSGao Xiang 33147e4937aSGao Xiang struct page *mpage; 33247e4937aSGao Xiang }; 33347e4937aSGao Xiang 33447e4937aSGao Xiang /* Flags used by erofs_map_blocks() */ 33547e4937aSGao Xiang #define EROFS_GET_BLOCKS_RAW 0x0001 33647e4937aSGao Xiang 33747e4937aSGao Xiang /* zmap.c */ 33847e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 33947e4937aSGao Xiang int z_erofs_fill_inode(struct inode *inode); 34047e4937aSGao Xiang int z_erofs_map_blocks_iter(struct inode *inode, 34147e4937aSGao Xiang struct erofs_map_blocks *map, 34247e4937aSGao Xiang int flags); 34347e4937aSGao Xiang #else 34447e4937aSGao Xiang static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; } 34547e4937aSGao Xiang static inline int z_erofs_map_blocks_iter(struct inode *inode, 34647e4937aSGao Xiang struct erofs_map_blocks *map, 34747e4937aSGao Xiang int flags) 34847e4937aSGao Xiang { 34947e4937aSGao Xiang return -EOPNOTSUPP; 35047e4937aSGao Xiang } 35147e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 35247e4937aSGao Xiang 35347e4937aSGao Xiang /* data.c */ 354e655b5b3SGao Xiang struct page *erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr); 35547e4937aSGao Xiang 35647e4937aSGao Xiang int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int); 35747e4937aSGao Xiang 35847e4937aSGao Xiang /* inode.c */ 35947e4937aSGao Xiang static inline unsigned long erofs_inode_hash(erofs_nid_t nid) 36047e4937aSGao Xiang { 36147e4937aSGao Xiang #if BITS_PER_LONG == 32 36247e4937aSGao Xiang return (nid >> 32) ^ (nid & 0xffffffff); 36347e4937aSGao Xiang #else 36447e4937aSGao Xiang return nid; 36547e4937aSGao Xiang #endif 36647e4937aSGao Xiang } 36747e4937aSGao Xiang 36847e4937aSGao Xiang extern const struct inode_operations erofs_generic_iops; 36947e4937aSGao Xiang extern const struct inode_operations erofs_symlink_iops; 37047e4937aSGao Xiang extern const struct inode_operations erofs_fast_symlink_iops; 37147e4937aSGao Xiang 37247e4937aSGao Xiang struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir); 37347e4937aSGao Xiang int erofs_getattr(const struct path *path, struct kstat *stat, 37447e4937aSGao Xiang u32 request_mask, unsigned int query_flags); 37547e4937aSGao Xiang 37647e4937aSGao Xiang /* namei.c */ 37747e4937aSGao Xiang extern const struct inode_operations erofs_dir_iops; 37847e4937aSGao Xiang 37947e4937aSGao Xiang int erofs_namei(struct inode *dir, struct qstr *name, 38047e4937aSGao Xiang erofs_nid_t *nid, unsigned int *d_type); 38147e4937aSGao Xiang 38247e4937aSGao Xiang /* dir.c */ 38347e4937aSGao Xiang extern const struct file_operations erofs_dir_fops; 38447e4937aSGao Xiang 38547e4937aSGao Xiang /* utils.c / zdata.c */ 3865ddcee1fSGao Xiang struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp); 38747e4937aSGao Xiang 38847e4937aSGao Xiang #if (EROFS_PCPUBUF_NR_PAGES > 0) 38947e4937aSGao Xiang void *erofs_get_pcpubuf(unsigned int pagenr); 39047e4937aSGao Xiang #define erofs_put_pcpubuf(buf) do { \ 39147e4937aSGao Xiang (void)&(buf); \ 39247e4937aSGao Xiang preempt_enable(); \ 39347e4937aSGao Xiang } while (0) 39447e4937aSGao Xiang #else 39547e4937aSGao Xiang static inline void *erofs_get_pcpubuf(unsigned int pagenr) 39647e4937aSGao Xiang { 39747e4937aSGao Xiang return ERR_PTR(-EOPNOTSUPP); 39847e4937aSGao Xiang } 39947e4937aSGao Xiang 40047e4937aSGao Xiang #define erofs_put_pcpubuf(buf) do {} while (0) 40147e4937aSGao Xiang #endif 40247e4937aSGao Xiang 40347e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 40447e4937aSGao Xiang int erofs_workgroup_put(struct erofs_workgroup *grp); 40547e4937aSGao Xiang struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, 40647e4937aSGao Xiang pgoff_t index, bool *tag); 40747e4937aSGao Xiang int erofs_register_workgroup(struct super_block *sb, 40847e4937aSGao Xiang struct erofs_workgroup *grp, bool tag); 40947e4937aSGao Xiang void erofs_workgroup_free_rcu(struct erofs_workgroup *grp); 41047e4937aSGao Xiang void erofs_shrinker_register(struct super_block *sb); 41147e4937aSGao Xiang void erofs_shrinker_unregister(struct super_block *sb); 41247e4937aSGao Xiang int __init erofs_init_shrinker(void); 41347e4937aSGao Xiang void erofs_exit_shrinker(void); 41447e4937aSGao Xiang int __init z_erofs_init_zip_subsystem(void); 41547e4937aSGao Xiang void z_erofs_exit_zip_subsystem(void); 41647e4937aSGao Xiang int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 41747e4937aSGao Xiang struct erofs_workgroup *egrp); 41847e4937aSGao Xiang int erofs_try_to_free_cached_page(struct address_space *mapping, 41947e4937aSGao Xiang struct page *page); 42047e4937aSGao Xiang #else 42147e4937aSGao Xiang static inline void erofs_shrinker_register(struct super_block *sb) {} 42247e4937aSGao Xiang static inline void erofs_shrinker_unregister(struct super_block *sb) {} 42347e4937aSGao Xiang static inline int erofs_init_shrinker(void) { return 0; } 42447e4937aSGao Xiang static inline void erofs_exit_shrinker(void) {} 42547e4937aSGao Xiang static inline int z_erofs_init_zip_subsystem(void) { return 0; } 42647e4937aSGao Xiang static inline void z_erofs_exit_zip_subsystem(void) {} 42747e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 42847e4937aSGao Xiang 42947e4937aSGao Xiang #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 43047e4937aSGao Xiang 43147e4937aSGao Xiang #endif /* __EROFS_INTERNAL_H */ 43247e4937aSGao Xiang 433