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; 52955b478eSJeffle Xu struct erofs_fscache *fscache; 53dfeab2e9SGao Xiang struct block_device *bdev; 54dfeab2e9SGao Xiang struct dax_device *dax_dev; 55cd913c76SChristoph Hellwig u64 dax_part_off; 56dfeab2e9SGao Xiang 57dfeab2e9SGao Xiang u32 blocks; 58dfeab2e9SGao Xiang u32 mapped_blkaddr; 59dfeab2e9SGao Xiang }; 60dfeab2e9SGao Xiang 6140452ffcSHuang Jianan enum { 6240452ffcSHuang Jianan EROFS_SYNC_DECOMPRESS_AUTO, 6340452ffcSHuang Jianan EROFS_SYNC_DECOMPRESS_FORCE_ON, 6440452ffcSHuang Jianan EROFS_SYNC_DECOMPRESS_FORCE_OFF 6540452ffcSHuang Jianan }; 6640452ffcSHuang Jianan 67e6242465SGao Xiang struct erofs_mount_opts { 68f57a3fe4SChao Yu #ifdef CONFIG_EROFS_FS_ZIP 69f57a3fe4SChao Yu /* current strategy of how to use managed cache */ 70f57a3fe4SChao Yu unsigned char cache_strategy; 7140452ffcSHuang Jianan /* strategy of sync decompression (0 - auto, 1 - force on, 2 - force off) */ 7240452ffcSHuang Jianan unsigned int sync_decompress; 73f57a3fe4SChao Yu 74f57a3fe4SChao Yu /* threshold for decompression synchronously */ 75f57a3fe4SChao Yu unsigned int max_sync_decompress_pages; 76f57a3fe4SChao Yu #endif 77f57a3fe4SChao Yu unsigned int mount_opt; 78f57a3fe4SChao Yu }; 79f57a3fe4SChao Yu 80dfeab2e9SGao Xiang struct erofs_dev_context { 81dfeab2e9SGao Xiang struct idr tree; 82dfeab2e9SGao Xiang struct rw_semaphore rwsem; 83dfeab2e9SGao Xiang 84dfeab2e9SGao Xiang unsigned int extra_devices; 85dfeab2e9SGao Xiang }; 86dfeab2e9SGao Xiang 87e6242465SGao Xiang struct erofs_fs_context { 88e6242465SGao Xiang struct erofs_mount_opts opt; 89dfeab2e9SGao Xiang struct erofs_dev_context *devs; 9039bfcb81SJingbo Xu char *fsid; 9139bfcb81SJingbo Xu char *domain_id; 92e6242465SGao Xiang }; 93e6242465SGao Xiang 945d50538fSHuang Jianan /* all filesystem-wide lz4 configurations */ 955d50538fSHuang Jianan struct erofs_sb_lz4_info { 965d50538fSHuang Jianan /* # of pages needed for EROFS lz4 rolling decompression */ 975d50538fSHuang Jianan u16 max_distance_pages; 984fea63f7SGao Xiang /* maximum possible blocks for pclusters in the filesystem */ 994fea63f7SGao Xiang u16 max_pclusterblks; 1005d50538fSHuang Jianan }; 1015d50538fSHuang Jianan 1028b7adf1dSJia Zhu struct erofs_domain { 1038b7adf1dSJia Zhu refcount_t ref; 1048b7adf1dSJia Zhu struct list_head list; 1058b7adf1dSJia Zhu struct fscache_volume *volume; 1068b7adf1dSJia Zhu char *domain_id; 1078b7adf1dSJia Zhu }; 1088b7adf1dSJia Zhu 109b02c602fSJeffle Xu struct erofs_fscache { 110b02c602fSJeffle Xu struct fscache_cookie *cookie; 1113c265d7dSJeffle Xu struct inode *inode; 1127d419637SJia Zhu struct inode *anon_inode; 1137d419637SJia Zhu struct erofs_domain *domain; 1147d419637SJia Zhu char *name; 115b02c602fSJeffle Xu }; 116b02c602fSJeffle Xu 11747e4937aSGao Xiang struct erofs_sb_info { 118e6242465SGao Xiang struct erofs_mount_opts opt; /* options */ 11947e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 12047e4937aSGao Xiang /* list for all registered superblocks, mainly for shrinker */ 12147e4937aSGao Xiang struct list_head list; 12247e4937aSGao Xiang struct mutex umount_mutex; 12347e4937aSGao Xiang 12464094a04SGao Xiang /* managed XArray arranged in physical block number */ 12564094a04SGao Xiang struct xarray managed_pslots; 12647e4937aSGao Xiang 12747e4937aSGao Xiang unsigned int shrinker_run_no; 12814373711SGao Xiang u16 available_compr_algs; 12947e4937aSGao Xiang 13047e4937aSGao Xiang /* pseudo inode to manage cached pages */ 13147e4937aSGao Xiang struct inode *managed_cache; 1325d50538fSHuang Jianan 1335d50538fSHuang Jianan struct erofs_sb_lz4_info lz4; 134b15b2e30SYue Hu struct inode *packed_inode; 13547e4937aSGao Xiang #endif /* CONFIG_EROFS_FS_ZIP */ 136dfeab2e9SGao Xiang struct erofs_dev_context *devs; 13706252e9cSGao Xiang struct dax_device *dax_dev; 138cd913c76SChristoph Hellwig u64 dax_part_off; 139dfeab2e9SGao Xiang u64 total_blocks; 140dfeab2e9SGao Xiang u32 primarydevice_blocks; 141dfeab2e9SGao Xiang 14247e4937aSGao Xiang u32 meta_blkaddr; 14347e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_XATTR 14447e4937aSGao Xiang u32 xattr_blkaddr; 14547e4937aSGao Xiang #endif 146dfeab2e9SGao Xiang u16 device_id_mask; /* valid bits of device id to be used */ 14747e4937aSGao Xiang 14847e4937aSGao Xiang /* inode slot unit size in bit shift */ 14947e4937aSGao Xiang unsigned char islotbits; 15047e4937aSGao Xiang 15114373711SGao Xiang u32 sb_size; /* total superblock size */ 15247e4937aSGao Xiang u32 build_time_nsec; 15347e4937aSGao Xiang u64 build_time; 15447e4937aSGao Xiang 15547e4937aSGao Xiang /* what we really care is nid, rather than ino.. */ 15647e4937aSGao Xiang erofs_nid_t root_nid; 15747e4937aSGao Xiang /* used for statfs, f_files - f_favail */ 15847e4937aSGao Xiang u64 inos; 15947e4937aSGao Xiang 16047e4937aSGao Xiang u8 uuid[16]; /* 128-bit uuid for volume */ 16147e4937aSGao Xiang u8 volume_name[16]; /* volume name */ 162b858a484SPratik Shinde u32 feature_compat; 163426a9308SGao Xiang u32 feature_incompat; 164168e9a76SHuang Jianan 165168e9a76SHuang Jianan /* sysfs support */ 166168e9a76SHuang Jianan struct kobject s_kobj; /* /sys/fs/erofs/<devname> */ 167168e9a76SHuang Jianan struct completion s_kobj_unregister; 168c6be2bd0SJeffle Xu 169c6be2bd0SJeffle Xu /* fscache support */ 170c6be2bd0SJeffle Xu struct fscache_volume *volume; 17137c90c5fSJeffle Xu struct erofs_fscache *s_fscache; 1728b7adf1dSJia Zhu struct erofs_domain *domain; 17339bfcb81SJingbo Xu char *fsid; 17439bfcb81SJingbo Xu char *domain_id; 17547e4937aSGao Xiang }; 17647e4937aSGao Xiang 17747e4937aSGao Xiang #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) 17847e4937aSGao Xiang #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) 17947e4937aSGao Xiang 18047e4937aSGao Xiang /* Mount flags set via mount options or defaults */ 18147e4937aSGao Xiang #define EROFS_MOUNT_XATTR_USER 0x00000010 18247e4937aSGao Xiang #define EROFS_MOUNT_POSIX_ACL 0x00000020 18306252e9cSGao Xiang #define EROFS_MOUNT_DAX_ALWAYS 0x00000040 18406252e9cSGao Xiang #define EROFS_MOUNT_DAX_NEVER 0x00000080 18547e4937aSGao Xiang 186e6242465SGao Xiang #define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option) 187e6242465SGao Xiang #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option) 188e6242465SGao Xiang #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option) 18947e4937aSGao Xiang 19093b856bbSJeffle Xu static inline bool erofs_is_fscache_mode(struct super_block *sb) 19193b856bbSJeffle Xu { 19293b856bbSJeffle Xu return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !sb->s_bdev; 19393b856bbSJeffle Xu } 19493b856bbSJeffle Xu 19547e4937aSGao Xiang enum { 19647e4937aSGao Xiang EROFS_ZIP_CACHE_DISABLED, 19747e4937aSGao Xiang EROFS_ZIP_CACHE_READAHEAD, 19847e4937aSGao Xiang EROFS_ZIP_CACHE_READAROUND 19947e4937aSGao Xiang }; 20047e4937aSGao Xiang 20147e4937aSGao Xiang #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL) 20247e4937aSGao Xiang 20347e4937aSGao Xiang /* basic unit of the workstation of a super_block */ 20447e4937aSGao Xiang struct erofs_workgroup { 20547e4937aSGao Xiang /* the workgroup index in the workstation */ 20647e4937aSGao Xiang pgoff_t index; 20747e4937aSGao Xiang 20847e4937aSGao Xiang /* overall workgroup reference count */ 20947e4937aSGao Xiang atomic_t refcount; 21047e4937aSGao Xiang }; 21147e4937aSGao Xiang 21247e4937aSGao Xiang static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, 21347e4937aSGao Xiang int val) 21447e4937aSGao Xiang { 21547e4937aSGao Xiang preempt_disable(); 21647e4937aSGao Xiang if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) { 21747e4937aSGao Xiang preempt_enable(); 21847e4937aSGao Xiang return false; 21947e4937aSGao Xiang } 22047e4937aSGao Xiang return true; 22147e4937aSGao Xiang } 22247e4937aSGao Xiang 22347e4937aSGao Xiang static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, 22447e4937aSGao Xiang int orig_val) 22547e4937aSGao Xiang { 22647e4937aSGao Xiang /* 22747e4937aSGao Xiang * other observers should notice all modifications 22847e4937aSGao Xiang * in the freezing period. 22947e4937aSGao Xiang */ 23047e4937aSGao Xiang smp_mb(); 23147e4937aSGao Xiang atomic_set(&grp->refcount, orig_val); 23247e4937aSGao Xiang preempt_enable(); 23347e4937aSGao Xiang } 23447e4937aSGao Xiang 23547e4937aSGao Xiang static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) 23647e4937aSGao Xiang { 23747e4937aSGao Xiang return atomic_cond_read_relaxed(&grp->refcount, 23847e4937aSGao Xiang VAL != EROFS_LOCKED_MAGIC); 23947e4937aSGao Xiang } 24047e4937aSGao Xiang 24147e4937aSGao Xiang /* we strictly follow PAGE_SIZE and no buffer head yet */ 24247e4937aSGao Xiang #define LOG_BLOCK_SIZE PAGE_SHIFT 24347e4937aSGao Xiang 24447e4937aSGao Xiang #undef LOG_SECTORS_PER_BLOCK 24547e4937aSGao Xiang #define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) 24647e4937aSGao Xiang 24747e4937aSGao Xiang #undef SECTORS_PER_BLOCK 24847e4937aSGao Xiang #define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK) 24947e4937aSGao Xiang 25047e4937aSGao Xiang #define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE) 25147e4937aSGao Xiang 25247e4937aSGao Xiang #if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ) 25347e4937aSGao Xiang #error erofs cannot be used in this platform 25447e4937aSGao Xiang #endif 25547e4937aSGao Xiang 256fdf80a47SGao Xiang enum erofs_kmap_type { 257fdf80a47SGao Xiang EROFS_NO_KMAP, /* don't map the buffer */ 258927e5010SGao Xiang EROFS_KMAP, /* use kmap_local_page() to map the buffer */ 259fdf80a47SGao Xiang }; 260fdf80a47SGao Xiang 261fdf80a47SGao Xiang struct erofs_buf { 262fdf80a47SGao Xiang struct page *page; 263fdf80a47SGao Xiang void *base; 264fdf80a47SGao Xiang enum erofs_kmap_type kmap_type; 265fdf80a47SGao Xiang }; 266fdf80a47SGao Xiang #define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL }) 267fdf80a47SGao Xiang 26847e4937aSGao Xiang #define ROOT_NID(sb) ((sb)->root_nid) 26947e4937aSGao Xiang 27047e4937aSGao Xiang #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) 27147e4937aSGao Xiang #define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ) 27247e4937aSGao Xiang #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ) 27347e4937aSGao Xiang 27447e4937aSGao Xiang static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid) 27547e4937aSGao Xiang { 27647e4937aSGao Xiang return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits); 27747e4937aSGao Xiang } 27847e4937aSGao Xiang 279de06a6a3SGao Xiang #define EROFS_FEATURE_FUNCS(name, compat, feature) \ 280de06a6a3SGao Xiang static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \ 281de06a6a3SGao Xiang { \ 282de06a6a3SGao Xiang return sbi->feature_##compat & EROFS_FEATURE_##feature; \ 283de06a6a3SGao Xiang } 284de06a6a3SGao Xiang 2857e508f2cSHuang Jianan EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING) 28614373711SGao Xiang EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS) 2875404c330SGao Xiang EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER) 288168e9a76SHuang Jianan EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE) 289dfeab2e9SGao Xiang EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE) 290168e9a76SHuang Jianan EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2) 291ab92184fSYue Hu EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING) 292b15b2e30SYue Hu EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS) 2935c2a6425SGao Xiang EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE) 294de06a6a3SGao Xiang EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) 295de06a6a3SGao Xiang 29647e4937aSGao Xiang /* atomic flag definitions */ 297a5876e24SGao Xiang #define EROFS_I_EA_INITED_BIT 0 298a5876e24SGao Xiang #define EROFS_I_Z_INITED_BIT 1 29947e4937aSGao Xiang 30047e4937aSGao Xiang /* bitlock definitions (arranged in reverse order) */ 301a5876e24SGao Xiang #define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1) 302a5876e24SGao Xiang #define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2) 30347e4937aSGao Xiang 304a5876e24SGao Xiang struct erofs_inode { 30547e4937aSGao Xiang erofs_nid_t nid; 30647e4937aSGao Xiang 30747e4937aSGao Xiang /* atomic flags (including bitlocks) */ 30847e4937aSGao Xiang unsigned long flags; 30947e4937aSGao Xiang 3108a765682SGao Xiang unsigned char datalayout; 31147e4937aSGao Xiang unsigned char inode_isize; 31247e4937aSGao Xiang unsigned short xattr_isize; 31347e4937aSGao Xiang 31447e4937aSGao Xiang unsigned int xattr_shared_count; 31547e4937aSGao Xiang unsigned int *xattr_shared_xattrs; 31647e4937aSGao Xiang 31747e4937aSGao Xiang union { 31847e4937aSGao Xiang erofs_blk_t raw_blkaddr; 319c5aa903aSGao Xiang struct { 320c5aa903aSGao Xiang unsigned short chunkformat; 321c5aa903aSGao Xiang unsigned char chunkbits; 322c5aa903aSGao Xiang }; 32347e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 32447e4937aSGao Xiang struct { 32547e4937aSGao Xiang unsigned short z_advise; 32647e4937aSGao Xiang unsigned char z_algorithmtype[2]; 32747e4937aSGao Xiang unsigned char z_logical_clusterbits; 328ab92184fSYue Hu unsigned long z_tailextent_headlcn; 329b15b2e30SYue Hu union { 330b15b2e30SYue Hu struct { 33122ba5e99SGao Xiang erofs_off_t z_idataoff; 332ab92184fSYue Hu unsigned short z_idata_size; 33347e4937aSGao Xiang }; 334b15b2e30SYue Hu erofs_off_t z_fragmentoff; 335b15b2e30SYue Hu }; 336b15b2e30SYue Hu }; 33747e4937aSGao Xiang #endif /* CONFIG_EROFS_FS_ZIP */ 33847e4937aSGao Xiang }; 33947e4937aSGao Xiang /* the corresponding vfs inode */ 34047e4937aSGao Xiang struct inode vfs_inode; 34147e4937aSGao Xiang }; 34247e4937aSGao Xiang 343a5876e24SGao Xiang #define EROFS_I(ptr) \ 344a5876e24SGao Xiang container_of(ptr, struct erofs_inode, vfs_inode) 34547e4937aSGao Xiang 34699634bf3SGao Xiang static inline unsigned long erofs_inode_datablocks(struct inode *inode) 34747e4937aSGao Xiang { 34847e4937aSGao Xiang /* since i_size cannot be changed */ 34947e4937aSGao Xiang return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ); 35047e4937aSGao Xiang } 35147e4937aSGao Xiang 3528a765682SGao Xiang static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit, 3538a765682SGao Xiang unsigned int bits) 35447e4937aSGao Xiang { 3558a765682SGao Xiang 3568a765682SGao Xiang return (value >> bit) & ((1 << bits) - 1); 35747e4937aSGao Xiang } 35847e4937aSGao Xiang 3598a765682SGao Xiang 3608a765682SGao Xiang static inline unsigned int erofs_inode_version(unsigned int value) 36147e4937aSGao Xiang { 3628a765682SGao Xiang return erofs_bitrange(value, EROFS_I_VERSION_BIT, 3638a765682SGao Xiang EROFS_I_VERSION_BITS); 3648a765682SGao Xiang } 3658a765682SGao Xiang 3668a765682SGao Xiang static inline unsigned int erofs_inode_datalayout(unsigned int value) 3678a765682SGao Xiang { 3688a765682SGao Xiang return erofs_bitrange(value, EROFS_I_DATALAYOUT_BIT, 3698a765682SGao Xiang EROFS_I_DATALAYOUT_BITS); 37047e4937aSGao Xiang } 37147e4937aSGao Xiang 37238629291SGao Xiang /* 37338629291SGao Xiang * Different from grab_cache_page_nowait(), reclaiming is never triggered 37438629291SGao Xiang * when allocating new pages. 37538629291SGao Xiang */ 37638629291SGao Xiang static inline 37738629291SGao Xiang struct page *erofs_grab_cache_page_nowait(struct address_space *mapping, 37838629291SGao Xiang pgoff_t index) 37938629291SGao Xiang { 38038629291SGao Xiang return pagecache_get_page(mapping, index, 38138629291SGao Xiang FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT, 38238629291SGao Xiang readahead_gfp_mask(mapping) & ~__GFP_RECLAIM); 38338629291SGao Xiang } 38438629291SGao Xiang 38547e4937aSGao Xiang extern const struct super_operations erofs_sops; 386a9849560SJia Zhu extern struct file_system_type erofs_fs_type; 38747e4937aSGao Xiang 38847e4937aSGao Xiang extern const struct address_space_operations erofs_raw_access_aops; 3890c638f70SGao Xiang extern const struct address_space_operations z_erofs_aops; 39047e4937aSGao Xiang 39147e4937aSGao Xiang enum { 3928f899262SGao Xiang BH_Encoded = BH_PrivateStart, 39347e4937aSGao Xiang BH_FullMapped, 394b15b2e30SYue Hu BH_Fragment, 3955c2a6425SGao Xiang BH_Partialref, 39647e4937aSGao Xiang }; 39747e4937aSGao Xiang 39847e4937aSGao Xiang /* Has a disk mapping */ 39947e4937aSGao Xiang #define EROFS_MAP_MAPPED (1 << BH_Mapped) 40047e4937aSGao Xiang /* Located in metadata (could be copied from bd_inode) */ 40147e4937aSGao Xiang #define EROFS_MAP_META (1 << BH_Meta) 4028f899262SGao Xiang /* The extent is encoded */ 4038f899262SGao Xiang #define EROFS_MAP_ENCODED (1 << BH_Encoded) 40447e4937aSGao Xiang /* The length of extent is full */ 40547e4937aSGao Xiang #define EROFS_MAP_FULL_MAPPED (1 << BH_FullMapped) 406b15b2e30SYue Hu /* Located in the special packed inode */ 407b15b2e30SYue Hu #define EROFS_MAP_FRAGMENT (1 << BH_Fragment) 4085c2a6425SGao Xiang /* The extent refers to partial decompressed data */ 4095c2a6425SGao Xiang #define EROFS_MAP_PARTIAL_REF (1 << BH_Partialref) 41047e4937aSGao Xiang 41147e4937aSGao Xiang struct erofs_map_blocks { 41209c54379SGao Xiang struct erofs_buf buf; 41309c54379SGao Xiang 41447e4937aSGao Xiang erofs_off_t m_pa, m_la; 41547e4937aSGao Xiang u64 m_plen, m_llen; 41647e4937aSGao Xiang 417dfeab2e9SGao Xiang unsigned short m_deviceid; 4188f899262SGao Xiang char m_algorithmformat; 41947e4937aSGao Xiang unsigned int m_flags; 42047e4937aSGao Xiang }; 42147e4937aSGao Xiang 4228137824eSYue Hu /* Flags used by erofs_map_blocks_flatmode() */ 42347e4937aSGao Xiang #define EROFS_GET_BLOCKS_RAW 0x0001 424d95ae5e2SGao Xiang /* 425d95ae5e2SGao Xiang * Used to get the exact decompressed length, e.g. fiemap (consider lookback 426d95ae5e2SGao Xiang * approach instead if possible since it's more metadata lightweight.) 427d95ae5e2SGao Xiang */ 428d95ae5e2SGao Xiang #define EROFS_GET_BLOCKS_FIEMAP 0x0002 429622ceaddSGao Xiang /* Used to map the whole extent if non-negligible data is requested for LZMA */ 430622ceaddSGao Xiang #define EROFS_GET_BLOCKS_READMORE 0x0004 431b15b2e30SYue Hu /* Used to map tail extent for tailpacking inline or fragment pcluster */ 432ab92184fSYue Hu #define EROFS_GET_BLOCKS_FINDTAIL 0x0008 43347e4937aSGao Xiang 4348f899262SGao Xiang enum { 4358f899262SGao Xiang Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX, 436fdffc091SYue Hu Z_EROFS_COMPRESSION_INTERLACED, 4378f899262SGao Xiang Z_EROFS_COMPRESSION_RUNTIME_MAX 4388f899262SGao Xiang }; 4398f899262SGao Xiang 44047e4937aSGao Xiang /* zmap.c */ 441eadcd6b5SGao Xiang extern const struct iomap_ops z_erofs_iomap_report_ops; 442eadcd6b5SGao Xiang 44347e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 44447e4937aSGao Xiang int z_erofs_fill_inode(struct inode *inode); 44547e4937aSGao Xiang int z_erofs_map_blocks_iter(struct inode *inode, 44647e4937aSGao Xiang struct erofs_map_blocks *map, 44747e4937aSGao Xiang int flags); 44847e4937aSGao Xiang #else 44947e4937aSGao Xiang static inline int z_erofs_fill_inode(struct inode *inode) { return -EOPNOTSUPP; } 45047e4937aSGao Xiang static inline int z_erofs_map_blocks_iter(struct inode *inode, 45147e4937aSGao Xiang struct erofs_map_blocks *map, 45247e4937aSGao Xiang int flags) 45347e4937aSGao Xiang { 45447e4937aSGao Xiang return -EOPNOTSUPP; 45547e4937aSGao Xiang } 45647e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 45747e4937aSGao Xiang 458dfeab2e9SGao Xiang struct erofs_map_dev { 459955b478eSJeffle Xu struct erofs_fscache *m_fscache; 460dfeab2e9SGao Xiang struct block_device *m_bdev; 461dfeab2e9SGao Xiang struct dax_device *m_daxdev; 462de205114SChristoph Hellwig u64 m_dax_part_off; 463dfeab2e9SGao Xiang 464dfeab2e9SGao Xiang erofs_off_t m_pa; 465dfeab2e9SGao Xiang unsigned int m_deviceid; 466dfeab2e9SGao Xiang }; 467dfeab2e9SGao Xiang 46847e4937aSGao Xiang /* data.c */ 469a08e67a0SHuang Jianan extern const struct file_operations erofs_file_fops; 47009c54379SGao Xiang void erofs_unmap_metabuf(struct erofs_buf *buf); 471c521e3adSGao Xiang void erofs_put_metabuf(struct erofs_buf *buf); 472fe5de585SGao Xiang void *erofs_bread(struct erofs_buf *buf, struct inode *inode, 473fe5de585SGao Xiang erofs_blk_t blkaddr, enum erofs_kmap_type type); 474c521e3adSGao Xiang void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb, 475c521e3adSGao Xiang erofs_blk_t blkaddr, enum erofs_kmap_type type); 476dfeab2e9SGao Xiang int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev); 477eadcd6b5SGao Xiang int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 478eadcd6b5SGao Xiang u64 start, u64 len); 47994d78946SJeffle Xu int erofs_map_blocks(struct inode *inode, 48094d78946SJeffle Xu struct erofs_map_blocks *map, int flags); 48147e4937aSGao Xiang 48247e4937aSGao Xiang /* inode.c */ 48347e4937aSGao Xiang static inline unsigned long erofs_inode_hash(erofs_nid_t nid) 48447e4937aSGao Xiang { 48547e4937aSGao Xiang #if BITS_PER_LONG == 32 48647e4937aSGao Xiang return (nid >> 32) ^ (nid & 0xffffffff); 48747e4937aSGao Xiang #else 48847e4937aSGao Xiang return nid; 48947e4937aSGao Xiang #endif 49047e4937aSGao Xiang } 49147e4937aSGao Xiang 49247e4937aSGao Xiang extern const struct inode_operations erofs_generic_iops; 49347e4937aSGao Xiang extern const struct inode_operations erofs_symlink_iops; 49447e4937aSGao Xiang extern const struct inode_operations erofs_fast_symlink_iops; 49547e4937aSGao Xiang 496312fe643SGao Xiang struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid); 497*b74d24f7SChristian Brauner int erofs_getattr(struct mnt_idmap *idmap, const struct path *path, 498549c7297SChristian Brauner struct kstat *stat, u32 request_mask, 499549c7297SChristian Brauner unsigned int query_flags); 50047e4937aSGao Xiang 50147e4937aSGao Xiang /* namei.c */ 50247e4937aSGao Xiang extern const struct inode_operations erofs_dir_iops; 50347e4937aSGao Xiang 5043e917cc3SHongnan Li int erofs_namei(struct inode *dir, const struct qstr *name, 50547e4937aSGao Xiang erofs_nid_t *nid, unsigned int *d_type); 50647e4937aSGao Xiang 50747e4937aSGao Xiang /* dir.c */ 50847e4937aSGao Xiang extern const struct file_operations erofs_dir_fops; 50947e4937aSGao Xiang 510598162d0SGao Xiang static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count) 511598162d0SGao Xiang { 512598162d0SGao Xiang int retried = 0; 513598162d0SGao Xiang 514598162d0SGao Xiang while (1) { 515598162d0SGao Xiang void *p = vm_map_ram(pages, count, -1); 516598162d0SGao Xiang 517598162d0SGao Xiang /* retry two more times (totally 3 times) */ 518598162d0SGao Xiang if (p || ++retried >= 3) 519598162d0SGao Xiang return p; 520598162d0SGao Xiang vm_unmap_aliases(); 521598162d0SGao Xiang } 522598162d0SGao Xiang return NULL; 523598162d0SGao Xiang } 524598162d0SGao Xiang 52552488734SGao Xiang /* pcpubuf.c */ 52652488734SGao Xiang void *erofs_get_pcpubuf(unsigned int requiredpages); 52752488734SGao Xiang void erofs_put_pcpubuf(void *ptr); 52852488734SGao Xiang int erofs_pcpubuf_growsize(unsigned int nrpages); 52952488734SGao Xiang void erofs_pcpubuf_init(void); 53052488734SGao Xiang void erofs_pcpubuf_exit(void); 53152488734SGao Xiang 532168e9a76SHuang Jianan /* sysfs.c */ 533168e9a76SHuang Jianan int erofs_register_sysfs(struct super_block *sb); 534168e9a76SHuang Jianan void erofs_unregister_sysfs(struct super_block *sb); 535168e9a76SHuang Jianan int __init erofs_init_sysfs(void); 536168e9a76SHuang Jianan void erofs_exit_sysfs(void); 537168e9a76SHuang Jianan 53847e4937aSGao Xiang /* utils.c / zdata.c */ 539eaa9172aSGao Xiang struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp); 540eaa9172aSGao Xiang static inline void erofs_pagepool_add(struct page **pagepool, 541eaa9172aSGao Xiang struct page *page) 542eaa9172aSGao Xiang { 543eaa9172aSGao Xiang set_page_private(page, (unsigned long)*pagepool); 544eaa9172aSGao Xiang *pagepool = page; 545eaa9172aSGao Xiang } 546eaa9172aSGao Xiang void erofs_release_pages(struct page **pagepool); 54747e4937aSGao Xiang 54847e4937aSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP 54947e4937aSGao Xiang int erofs_workgroup_put(struct erofs_workgroup *grp); 55047e4937aSGao Xiang struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb, 551997626d8SVladimir Zapolskiy pgoff_t index); 55264094a04SGao Xiang struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb, 553e5e9a432SVladimir Zapolskiy struct erofs_workgroup *grp); 55447e4937aSGao Xiang void erofs_workgroup_free_rcu(struct erofs_workgroup *grp); 55547e4937aSGao Xiang void erofs_shrinker_register(struct super_block *sb); 55647e4937aSGao Xiang void erofs_shrinker_unregister(struct super_block *sb); 55747e4937aSGao Xiang int __init erofs_init_shrinker(void); 55847e4937aSGao Xiang void erofs_exit_shrinker(void); 55947e4937aSGao Xiang int __init z_erofs_init_zip_subsystem(void); 56047e4937aSGao Xiang void z_erofs_exit_zip_subsystem(void); 56147e4937aSGao Xiang int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, 56247e4937aSGao Xiang struct erofs_workgroup *egrp); 563d252ff3dSYue Hu int erofs_try_to_free_cached_page(struct page *page); 5645d50538fSHuang Jianan int z_erofs_load_lz4_config(struct super_block *sb, 56546249cdeSGao Xiang struct erofs_super_block *dsb, 56646249cdeSGao Xiang struct z_erofs_lz4_cfgs *lz4, int len); 56747e4937aSGao Xiang #else 56847e4937aSGao Xiang static inline void erofs_shrinker_register(struct super_block *sb) {} 56947e4937aSGao Xiang static inline void erofs_shrinker_unregister(struct super_block *sb) {} 57047e4937aSGao Xiang static inline int erofs_init_shrinker(void) { return 0; } 57147e4937aSGao Xiang static inline void erofs_exit_shrinker(void) {} 57247e4937aSGao Xiang static inline int z_erofs_init_zip_subsystem(void) { return 0; } 57347e4937aSGao Xiang static inline void z_erofs_exit_zip_subsystem(void) {} 5745d50538fSHuang Jianan static inline int z_erofs_load_lz4_config(struct super_block *sb, 57546249cdeSGao Xiang struct erofs_super_block *dsb, 57646249cdeSGao Xiang struct z_erofs_lz4_cfgs *lz4, int len) 5775d50538fSHuang Jianan { 57814373711SGao Xiang if (lz4 || dsb->u1.lz4_max_distance) { 5795d50538fSHuang Jianan erofs_err(sb, "lz4 algorithm isn't enabled"); 5805d50538fSHuang Jianan return -EINVAL; 5815d50538fSHuang Jianan } 5825d50538fSHuang Jianan return 0; 5835d50538fSHuang Jianan } 58447e4937aSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 58547e4937aSGao Xiang 586622ceaddSGao Xiang #ifdef CONFIG_EROFS_FS_ZIP_LZMA 587622ceaddSGao Xiang int z_erofs_lzma_init(void); 588622ceaddSGao Xiang void z_erofs_lzma_exit(void); 589622ceaddSGao Xiang int z_erofs_load_lzma_config(struct super_block *sb, 590622ceaddSGao Xiang struct erofs_super_block *dsb, 591622ceaddSGao Xiang struct z_erofs_lzma_cfgs *lzma, int size); 592622ceaddSGao Xiang #else 593622ceaddSGao Xiang static inline int z_erofs_lzma_init(void) { return 0; } 594622ceaddSGao Xiang static inline int z_erofs_lzma_exit(void) { return 0; } 595622ceaddSGao Xiang static inline int z_erofs_load_lzma_config(struct super_block *sb, 596622ceaddSGao Xiang struct erofs_super_block *dsb, 597622ceaddSGao Xiang struct z_erofs_lzma_cfgs *lzma, int size) { 598622ceaddSGao Xiang if (lzma) { 599622ceaddSGao Xiang erofs_err(sb, "lzma algorithm isn't enabled"); 600622ceaddSGao Xiang return -EINVAL; 601622ceaddSGao Xiang } 602622ceaddSGao Xiang return 0; 603622ceaddSGao Xiang } 604622ceaddSGao Xiang #endif /* !CONFIG_EROFS_FS_ZIP */ 605622ceaddSGao Xiang 60627f2a2dcSHou Tao /* flags for erofs_fscache_register_cookie() */ 60727f2a2dcSHou Tao #define EROFS_REG_COOKIE_NEED_INODE 1 60827f2a2dcSHou Tao #define EROFS_REG_COOKIE_NEED_NOEXIST 2 60927f2a2dcSHou Tao 610c6be2bd0SJeffle Xu /* fscache.c */ 611c6be2bd0SJeffle Xu #ifdef CONFIG_EROFS_FS_ONDEMAND 612c6be2bd0SJeffle Xu int erofs_fscache_register_fs(struct super_block *sb); 613c6be2bd0SJeffle Xu void erofs_fscache_unregister_fs(struct super_block *sb); 614b02c602fSJeffle Xu 615e1de2da0SJia Zhu struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, 61627f2a2dcSHou Tao char *name, 61727f2a2dcSHou Tao unsigned int flags); 618e1de2da0SJia Zhu void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache); 6191442b02bSJeffle Xu 6201442b02bSJeffle Xu extern const struct address_space_operations erofs_fscache_access_aops; 621c6be2bd0SJeffle Xu #else 622c6be2bd0SJeffle Xu static inline int erofs_fscache_register_fs(struct super_block *sb) 623c6be2bd0SJeffle Xu { 624e1de2da0SJia Zhu return -EOPNOTSUPP; 625c6be2bd0SJeffle Xu } 626c6be2bd0SJeffle Xu static inline void erofs_fscache_unregister_fs(struct super_block *sb) {} 627b02c602fSJeffle Xu 628e1de2da0SJia Zhu static inline 629e1de2da0SJia Zhu struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb, 63027f2a2dcSHou Tao char *name, 63127f2a2dcSHou Tao unsigned int flags) 632b02c602fSJeffle Xu { 633e1de2da0SJia Zhu return ERR_PTR(-EOPNOTSUPP); 634b02c602fSJeffle Xu } 635b02c602fSJeffle Xu 636e1de2da0SJia Zhu static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache) 637b02c602fSJeffle Xu { 638b02c602fSJeffle Xu } 639c6be2bd0SJeffle Xu #endif 640c6be2bd0SJeffle Xu 64147e4937aSGao Xiang #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 64247e4937aSGao Xiang 64347e4937aSGao Xiang #endif /* __EROFS_INTERNAL_H */ 644