| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Hsiang Kao | 1970 | 88.98% | 25 | 86.21% |
| Chao Yu | 212 | 9.58% | 3 | 10.34% |
| Chengguang Xu | 32 | 1.45% | 1 | 3.45% |
| Total | 2214 | 29 |
/* SPDX-License-Identifier: GPL-2.0 * * linux/drivers/staging/erofs/internal.h * * Copyright (C) 2017-2018 HUAWEI, Inc. * http://www.huawei.com/ * Created by Gao Xiang <gaoxiang25@huawei.com> * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of the Linux * distribution for more details. */ #ifndef __INTERNAL_H #define __INTERNAL_H #include <linux/fs.h> #include <linux/dcache.h> #include <linux/mm.h> #include <linux/pagemap.h> #include <linux/bio.h> #include <linux/buffer_head.h> #include <linux/cleancache.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include "erofs_fs.h" /* redefine pr_fmt "erofs: " */ #undef pr_fmt #define pr_fmt(fmt) "erofs: " fmt #define errln(x, ...) pr_err(x "\n", ##__VA_ARGS__) #define infoln(x, ...) pr_info(x "\n", ##__VA_ARGS__) #ifdef CONFIG_EROFS_FS_DEBUG #define debugln(x, ...) pr_debug(x "\n", ##__VA_ARGS__) #define dbg_might_sleep might_sleep #define DBG_BUGON BUG_ON #else #define debugln(x, ...) ((void)0) #define dbg_might_sleep() ((void)0) #define DBG_BUGON(x) ((void)(x)) #endif enum { FAULT_KMALLOC, FAULT_MAX, }; #ifdef CONFIG_EROFS_FAULT_INJECTION extern char *erofs_fault_name[FAULT_MAX]; #define IS_FAULT_SET(fi, type) ((fi)->inject_type & (1 << (type))) struct erofs_fault_info { atomic_t inject_ops; unsigned int inject_rate; unsigned int inject_type; }; #endif #ifdef CONFIG_EROFS_FS_ZIP_CACHE_BIPOLAR #define EROFS_FS_ZIP_CACHE_LVL (2) #elif defined(EROFS_FS_ZIP_CACHE_UNIPOLAR) #define EROFS_FS_ZIP_CACHE_LVL (1) #else #define EROFS_FS_ZIP_CACHE_LVL (0) #endif #if (!defined(EROFS_FS_HAS_MANAGED_CACHE) && (EROFS_FS_ZIP_CACHE_LVL > 0)) #define EROFS_FS_HAS_MANAGED_CACHE #endif /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */ #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1 typedef u64 erofs_nid_t; struct erofs_sb_info { /* list for all registered superblocks, mainly for shrinker */ struct list_head list; struct mutex umount_mutex; u32 blocks; u32 meta_blkaddr; #ifdef CONFIG_EROFS_FS_XATTR u32 xattr_blkaddr; #endif /* inode slot unit size in bit shift */ unsigned char islotbits; #ifdef CONFIG_EROFS_FS_ZIP /* cluster size in bit shift */ unsigned char clusterbits; /* the dedicated workstation for compression */ struct radix_tree_root workstn_tree; /* threshold for decompression synchronously */ unsigned int max_sync_decompress_pages; #ifdef EROFS_FS_HAS_MANAGED_CACHE struct inode *managed_cache; #endif #endif u32 build_time_nsec; u64 build_time; /* what we really care is nid, rather than ino.. */ erofs_nid_t root_nid; /* used for statfs, f_files - f_favail */ u64 inos; u8 uuid[16]; /* 128-bit uuid for volume */ u8 volume_name[16]; /* volume name */ char *dev_name; unsigned int mount_opt; unsigned int shrinker_run_no; #ifdef CONFIG_EROFS_FAULT_INJECTION struct erofs_fault_info fault_info; /* For fault injection */ #endif }; #ifdef CONFIG_EROFS_FAULT_INJECTION #define erofs_show_injection_info(type) \ infoln("inject %s in %s of %pS", erofs_fault_name[type], \ __func__, __builtin_return_address(0)) static inline bool time_to_inject(struct erofs_sb_info *sbi, int type) { struct erofs_fault_info *ffi = &sbi->fault_info; if (!ffi->inject_rate) return false; if (!IS_FAULT_SET(ffi, type)) return false; atomic_inc(&ffi->inject_ops); if (atomic_read(&ffi->inject_ops) >= ffi->inject_rate) { atomic_set(&ffi->inject_ops, 0); return true; } return false; } #else static inline bool time_to_inject(struct erofs_sb_info *sbi, int type) { return false; } static inline void erofs_show_injection_info(int type) { } #endif static inline void *erofs_kmalloc(struct erofs_sb_info *sbi, size_t size, gfp_t flags) { if (time_to_inject(sbi, FAULT_KMALLOC)) { erofs_show_injection_info(FAULT_KMALLOC); return NULL; } return kmalloc(size, flags); } #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) /* Mount flags set via mount options or defaults */ #define EROFS_MOUNT_XATTR_USER 0x00000010 #define EROFS_MOUNT_POSIX_ACL 0x00000020 #define EROFS_MOUNT_FAULT_INJECTION 0x00000040 #define clear_opt(sbi, option) ((sbi)->mount_opt &= ~EROFS_MOUNT_##option) #define set_opt(sbi, option) ((sbi)->mount_opt |= EROFS_MOUNT_##option) #define test_opt(sbi, option) ((sbi)->mount_opt & EROFS_MOUNT_##option) #ifdef CONFIG_EROFS_FS_ZIP #define erofs_workstn_lock(sbi) xa_lock(&(sbi)->workstn_tree) #define erofs_workstn_unlock(sbi) xa_unlock(&(sbi)->workstn_tree) /* basic unit of the workstation of a super_block */ struct erofs_workgroup { /* the workgroup index in the workstation */ pgoff_t index; /* overall workgroup reference count */ atomic_t refcount; }; #define EROFS_LOCKED_MAGIC (INT_MIN | 0xE0F510CCL) #if defined(CONFIG_SMP) static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, int val) { preempt_disable(); if (val != atomic_cmpxchg(&grp->refcount, val, EROFS_LOCKED_MAGIC)) { preempt_enable(); return false; } return true; } static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, int orig_val) { /* * other observers should notice all modifications * in the freezing period. */ smp_mb(); atomic_set(&grp->refcount, orig_val); preempt_enable(); } static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) { return atomic_cond_read_relaxed(&grp->refcount, VAL != EROFS_LOCKED_MAGIC); } #else static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp, int val) { preempt_disable(); /* no need to spin on UP platforms, let's just disable preemption. */ if (val != atomic_read(&grp->refcount)) { preempt_enable(); return false; } return true; } static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp, int orig_val) { preempt_enable(); } static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp) { int v = atomic_read(&grp->refcount); /* workgroup is never freezed on uniprocessor systems */ DBG_BUGON(v == EROFS_LOCKED_MAGIC); return v; } #endif static inline bool erofs_workgroup_get(struct erofs_workgroup *grp, int *ocnt) { int o; repeat: o = erofs_wait_on_workgroup_freezed(grp); if (unlikely(o <= 0)) return -1; if (unlikely(atomic_cmpxchg(&grp->refcount, o, o + 1) != o)) goto repeat; *ocnt = o; return 0; } #define __erofs_workgroup_get(grp) atomic_inc(&(grp)->refcount) #define __erofs_workgroup_put(grp) atomic_dec(&(grp)->refcount) extern int erofs_workgroup_put(struct erofs_workgroup *grp); extern struct erofs_workgroup *erofs_find_workgroup( struct super_block *sb, pgoff_t index, bool *tag); extern int erofs_register_workgroup(struct super_block *sb, struct erofs_workgroup *grp, bool tag); extern unsigned long erofs_shrink_workstation(struct erofs_sb_info *sbi, unsigned long nr_shrink, bool cleanup); static inline void erofs_workstation_cleanup_all(struct super_block *sb) { erofs_shrink_workstation(EROFS_SB(sb), ~0UL, true); } #ifdef EROFS_FS_HAS_MANAGED_CACHE extern int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi, struct erofs_workgroup *egrp); extern int erofs_try_to_free_cached_page(struct address_space *mapping, struct page *page); #define MNGD_MAPPING(sbi) ((sbi)->managed_cache->i_mapping) #else #define MNGD_MAPPING(sbi) (NULL) #endif #define DEFAULT_MAX_SYNC_DECOMPRESS_PAGES 3 static inline bool __should_decompress_synchronously(struct erofs_sb_info *sbi, unsigned int nr) { return nr <= sbi->max_sync_decompress_pages; } int __init z_erofs_init_zip_subsystem(void); void z_erofs_exit_zip_subsystem(void); #else /* dummy initializer/finalizer for the decompression subsystem */ static inline int z_erofs_init_zip_subsystem(void) { return 0; } static inline void z_erofs_exit_zip_subsystem(void) {} #endif /* we strictly follow PAGE_SIZE and no buffer head yet */ #define LOG_BLOCK_SIZE PAGE_SHIFT #undef LOG_SECTORS_PER_BLOCK #define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9) #undef SECTORS_PER_BLOCK #define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK) #define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE) #if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ) #error erofs cannot be used in this platform #endif #define ROOT_NID(sb) ((sb)->root_nid) #ifdef CONFIG_EROFS_FS_ZIP /* hard limit of pages per compressed cluster */ #define Z_EROFS_CLUSTER_MAX_PAGES (CONFIG_EROFS_FS_CLUSTER_PAGE_LIMIT) /* page count of a compressed cluster */ #define erofs_clusterpages(sbi) ((1 << (sbi)->clusterbits) / PAGE_SIZE) #endif typedef u64 erofs_off_t; /* data type for filesystem-wide blocks number */ typedef u32 erofs_blk_t; #define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ) #define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ) #define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ) static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid) { return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits); } #define inode_set_inited_xattr(inode) (EROFS_V(inode)->flags |= 1) #define inode_has_inited_xattr(inode) (EROFS_V(inode)->flags & 1) struct erofs_vnode { erofs_nid_t nid; unsigned int flags; unsigned char data_mapping_mode; /* inline size in bytes */ unsigned char inode_isize; unsigned short xattr_isize; unsigned xattr_shared_count; unsigned *xattr_shared_xattrs; erofs_blk_t raw_blkaddr; /* the corresponding vfs inode */ struct inode vfs_inode; }; #define EROFS_V(ptr) \ container_of(ptr, struct erofs_vnode, vfs_inode) #define __inode_advise(x, bit, bits) \ (((x) >> (bit)) & ((1 << (bits)) - 1)) #define __inode_version(advise) \ __inode_advise(advise, EROFS_I_VERSION_BIT, \ EROFS_I_VERSION_BITS) #define __inode_data_mapping(advise) \ __inode_advise(advise, EROFS_I_DATA_MAPPING_BIT,\ EROFS_I_DATA_MAPPING_BITS) static inline unsigned long inode_datablocks(struct inode *inode) { /* since i_size cannot be changed */ return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ); } static inline bool is_inode_layout_plain(struct inode *inode) { return EROFS_V(inode)->data_mapping_mode == EROFS_INODE_LAYOUT_PLAIN; } static inline bool is_inode_layout_compression(struct inode *inode) { return EROFS_V(inode)->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION; } static inline bool is_inode_layout_inline(struct inode *inode) { return EROFS_V(inode)->data_mapping_mode == EROFS_INODE_LAYOUT_INLINE; } extern const struct super_operations erofs_sops; extern const struct inode_operations erofs_dir_iops; extern const struct file_operations erofs_dir_fops; extern const struct address_space_operations erofs_raw_access_aops; #ifdef CONFIG_EROFS_FS_ZIP extern const struct address_space_operations z_erofs_vle_normalaccess_aops; #endif /* * Logical to physical block mapping, used by erofs_map_blocks() * * Different with other file systems, it is used for 2 access modes: * * 1) RAW access mode: * * Users pass a valid (m_lblk, m_lofs -- usually 0) pair, * and get the valid m_pblk, m_pofs and the longest m_len(in bytes). * * Note that m_lblk in the RAW access mode refers to the number of * the compressed ondisk block rather than the uncompressed * in-memory block for the compressed file. * * m_pofs equals to m_lofs except for the inline data page. * * 2) Normal access mode: * * If the inode is not compressed, it has no difference with * the RAW access mode. However, if the inode is compressed, * users should pass a valid (m_lblk, m_lofs) pair, and get * the needed m_pblk, m_pofs, m_len to get the compressed data * and the updated m_lblk, m_lofs which indicates the start * of the corresponding uncompressed data in the file. */ enum { BH_Zipped = BH_PrivateStart, }; /* Has a disk mapping */ #define EROFS_MAP_MAPPED (1 << BH_Mapped) /* Located in metadata (could be copied from bd_inode) */ #define EROFS_MAP_META (1 << BH_Meta) /* The extent has been compressed */ #define EROFS_MAP_ZIPPED (1 << BH_Zipped) struct erofs_map_blocks { erofs_off_t m_pa, m_la; u64 m_plen, m_llen; unsigned int m_flags; }; /* Flags used by erofs_map_blocks() */ #define EROFS_GET_BLOCKS_RAW 0x0001 /* data.c */ static inline struct bio * erofs_grab_bio(struct super_block *sb, erofs_blk_t blkaddr, unsigned int nr_pages, bio_end_io_t endio, bool nofail) { const gfp_t gfp = GFP_NOIO; struct bio *bio; do { if (nr_pages == 1) { bio = bio_alloc(gfp | (nofail ? __GFP_NOFAIL : 0), 1); if (unlikely(bio == NULL)) { DBG_BUGON(nofail); return ERR_PTR(-ENOMEM); } break; } bio = bio_alloc(gfp, nr_pages); nr_pages /= 2; } while (unlikely(bio == NULL)); bio->bi_end_io = endio; bio_set_dev(bio, sb->s_bdev); bio->bi_iter.bi_sector = (sector_t)blkaddr << LOG_SECTORS_PER_BLOCK; return bio; } static inline void __submit_bio(struct bio *bio, unsigned op, unsigned op_flags) { bio_set_op_attrs(bio, op, op_flags); submit_bio(bio); } #ifndef CONFIG_EROFS_FS_IO_MAX_RETRIES #define EROFS_IO_MAX_RETRIES_NOFAIL 0 #else #define EROFS_IO_MAX_RETRIES_NOFAIL CONFIG_EROFS_FS_IO_MAX_RETRIES #endif extern struct page *__erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr, bool prio, bool nofail); static inline struct page *erofs_get_meta_page(struct super_block *sb, erofs_blk_t blkaddr, bool prio) { return __erofs_get_meta_page(sb, blkaddr, prio, false); } static inline struct page *erofs_get_meta_page_nofail(struct super_block *sb, erofs_blk_t blkaddr, bool prio) { return __erofs_get_meta_page(sb, blkaddr, prio, true); } extern int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int); extern int erofs_map_blocks_iter(struct inode *, struct erofs_map_blocks *, struct page **, int); struct erofs_map_blocks_iter { struct erofs_map_blocks map; struct page *mpage; }; static inline struct page * erofs_get_inline_page(struct inode *inode, erofs_blk_t blkaddr) { return erofs_get_meta_page(inode->i_sb, blkaddr, S_ISDIR(inode->i_mode)); } /* inode.c */ static inline unsigned long erofs_inode_hash(erofs_nid_t nid) { #if BITS_PER_LONG == 32 return (nid >> 32) ^ (nid & 0xffffffff); #else return nid; #endif } extern struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir); /* dir.c */ int erofs_namei(struct inode *dir, struct qstr *name, erofs_nid_t *nid, unsigned *d_type); #ifdef CONFIG_EROFS_FS_XATTR /* xattr.c */ extern const struct xattr_handler *erofs_xattr_handlers[]; /* symlink and special inode */ extern const struct inode_operations erofs_symlink_xattr_iops; extern const struct inode_operations erofs_fast_symlink_xattr_iops; extern const struct inode_operations erofs_special_inode_operations; #endif static inline void set_inode_fast_symlink(struct inode *inode) { #ifdef CONFIG_EROFS_FS_XATTR inode->i_op = &erofs_fast_symlink_xattr_iops; #else inode->i_op = &simple_symlink_inode_operations; #endif } static inline bool is_inode_fast_symlink(struct inode *inode) { #ifdef CONFIG_EROFS_FS_XATTR return inode->i_op == &erofs_fast_symlink_xattr_iops; #else return inode->i_op == &simple_symlink_inode_operations; #endif } static inline void *erofs_vmap(struct page **pages, unsigned int count) { #ifdef CONFIG_EROFS_FS_USE_VM_MAP_RAM int i = 0; while (1) { void *addr = vm_map_ram(pages, count, -1, PAGE_KERNEL); /* retry two more times (totally 3 times) */ if (addr != NULL || ++i >= 3) return addr; vm_unmap_aliases(); } return NULL; #else return vmap(pages, count, VM_MAP, PAGE_KERNEL); #endif } static inline void erofs_vunmap(const void *mem, unsigned int count) { #ifdef CONFIG_EROFS_FS_USE_VM_MAP_RAM vm_unmap_ram(mem, count); #else vunmap(mem); #endif } /* utils.c */ extern struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp); extern void erofs_register_super(struct super_block *sb); extern void erofs_unregister_super(struct super_block *sb); extern unsigned long erofs_shrink_count(struct shrinker *shrink, struct shrink_control *sc); extern unsigned long erofs_shrink_scan(struct shrinker *shrink, struct shrink_control *sc); #ifndef lru_to_page #define lru_to_page(head) (list_entry((head)->prev, struct page, lru)) #endif #endif
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