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-rw-r--r--fs/erofs/internal.h537
1 files changed, 537 insertions, 0 deletions
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
new file mode 100644
index 0000000000..d8de61350d
--- /dev/null
+++ b/fs/erofs/internal.h
@@ -0,0 +1,537 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2017-2018 HUAWEI, Inc.
+ * https://www.huawei.com/
+ * Copyright (C) 2021, Alibaba Cloud
+ */
+#ifndef __EROFS_INTERNAL_H
+#define __EROFS_INTERNAL_H
+
+#include <linux/fs.h>
+#include <linux/dcache.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/bio.h>
+#include <linux/magic.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/iomap.h>
+#include "erofs_fs.h"
+
+/* redefine pr_fmt "erofs: " */
+#undef pr_fmt
+#define pr_fmt(fmt) "erofs: " fmt
+
+__printf(3, 4) void _erofs_err(struct super_block *sb,
+ const char *function, const char *fmt, ...);
+#define erofs_err(sb, fmt, ...) \
+ _erofs_err(sb, __func__, fmt "\n", ##__VA_ARGS__)
+__printf(3, 4) void _erofs_info(struct super_block *sb,
+ const char *function, const char *fmt, ...);
+#define erofs_info(sb, fmt, ...) \
+ _erofs_info(sb, __func__, fmt "\n", ##__VA_ARGS__)
+#ifdef CONFIG_EROFS_FS_DEBUG
+#define DBG_BUGON BUG_ON
+#else
+#define DBG_BUGON(x) ((void)(x))
+#endif /* !CONFIG_EROFS_FS_DEBUG */
+
+/* EROFS_SUPER_MAGIC_V1 to represent the whole file system */
+#define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1
+
+typedef u64 erofs_nid_t;
+typedef u64 erofs_off_t;
+/* data type for filesystem-wide blocks number */
+typedef u32 erofs_blk_t;
+
+struct erofs_device_info {
+ char *path;
+ struct erofs_fscache *fscache;
+ struct block_device *bdev;
+ struct dax_device *dax_dev;
+ u64 dax_part_off;
+
+ u32 blocks;
+ u32 mapped_blkaddr;
+};
+
+enum {
+ EROFS_SYNC_DECOMPRESS_AUTO,
+ EROFS_SYNC_DECOMPRESS_FORCE_ON,
+ EROFS_SYNC_DECOMPRESS_FORCE_OFF
+};
+
+struct erofs_mount_opts {
+#ifdef CONFIG_EROFS_FS_ZIP
+ /* current strategy of how to use managed cache */
+ unsigned char cache_strategy;
+ /* strategy of sync decompression (0 - auto, 1 - force on, 2 - force off) */
+ unsigned int sync_decompress;
+
+ /* threshold for decompression synchronously */
+ unsigned int max_sync_decompress_pages;
+#endif
+ unsigned int mount_opt;
+};
+
+struct erofs_dev_context {
+ struct idr tree;
+ struct rw_semaphore rwsem;
+
+ unsigned int extra_devices;
+ bool flatdev;
+};
+
+struct erofs_fs_context {
+ struct erofs_mount_opts opt;
+ struct erofs_dev_context *devs;
+ char *fsid;
+ char *domain_id;
+};
+
+/* all filesystem-wide lz4 configurations */
+struct erofs_sb_lz4_info {
+ /* # of pages needed for EROFS lz4 rolling decompression */
+ u16 max_distance_pages;
+ /* maximum possible blocks for pclusters in the filesystem */
+ u16 max_pclusterblks;
+};
+
+struct erofs_domain {
+ refcount_t ref;
+ struct list_head list;
+ struct fscache_volume *volume;
+ char *domain_id;
+};
+
+struct erofs_fscache {
+ struct fscache_cookie *cookie;
+ struct inode *inode; /* anonymous inode for the blob */
+
+ /* used for share domain mode */
+ struct erofs_domain *domain;
+ struct list_head node;
+ refcount_t ref;
+ char *name;
+};
+
+struct erofs_xattr_prefix_item {
+ struct erofs_xattr_long_prefix *prefix;
+ u8 infix_len;
+};
+
+struct erofs_sb_info {
+ struct erofs_mount_opts opt; /* options */
+#ifdef CONFIG_EROFS_FS_ZIP
+ /* list for all registered superblocks, mainly for shrinker */
+ struct list_head list;
+ struct mutex umount_mutex;
+
+ /* managed XArray arranged in physical block number */
+ struct xarray managed_pslots;
+
+ unsigned int shrinker_run_no;
+ u16 available_compr_algs;
+
+ /* pseudo inode to manage cached pages */
+ struct inode *managed_cache;
+
+ struct erofs_sb_lz4_info lz4;
+#endif /* CONFIG_EROFS_FS_ZIP */
+ struct inode *packed_inode;
+ struct erofs_dev_context *devs;
+ struct dax_device *dax_dev;
+ u64 dax_part_off;
+ u64 total_blocks;
+ u32 primarydevice_blocks;
+
+ u32 meta_blkaddr;
+#ifdef CONFIG_EROFS_FS_XATTR
+ u32 xattr_blkaddr;
+ u32 xattr_prefix_start;
+ u8 xattr_prefix_count;
+ struct erofs_xattr_prefix_item *xattr_prefixes;
+ unsigned int xattr_filter_reserved;
+#endif
+ u16 device_id_mask; /* valid bits of device id to be used */
+
+ unsigned char islotbits; /* inode slot unit size in bit shift */
+ unsigned char blkszbits; /* filesystem block size in bit shift */
+
+ u32 sb_size; /* total superblock size */
+ u32 build_time_nsec;
+ u64 build_time;
+
+ /* what we really care is nid, rather than ino.. */
+ erofs_nid_t root_nid;
+ erofs_nid_t packed_nid;
+ /* used for statfs, f_files - f_favail */
+ u64 inos;
+
+ u8 uuid[16]; /* 128-bit uuid for volume */
+ u8 volume_name[16]; /* volume name */
+ u32 feature_compat;
+ u32 feature_incompat;
+
+ /* sysfs support */
+ struct kobject s_kobj; /* /sys/fs/erofs/<devname> */
+ struct completion s_kobj_unregister;
+
+ /* fscache support */
+ struct fscache_volume *volume;
+ struct erofs_fscache *s_fscache;
+ struct erofs_domain *domain;
+ char *fsid;
+ char *domain_id;
+};
+
+#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_DAX_ALWAYS 0x00000040
+#define EROFS_MOUNT_DAX_NEVER 0x00000080
+
+#define clear_opt(opt, option) ((opt)->mount_opt &= ~EROFS_MOUNT_##option)
+#define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option)
+#define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option)
+
+static inline bool erofs_is_fscache_mode(struct super_block *sb)
+{
+ return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !sb->s_bdev;
+}
+
+enum {
+ EROFS_ZIP_CACHE_DISABLED,
+ EROFS_ZIP_CACHE_READAHEAD,
+ EROFS_ZIP_CACHE_READAROUND
+};
+
+/* basic unit of the workstation of a super_block */
+struct erofs_workgroup {
+ pgoff_t index;
+ struct lockref lockref;
+};
+
+enum erofs_kmap_type {
+ EROFS_NO_KMAP, /* don't map the buffer */
+ EROFS_KMAP, /* use kmap_local_page() to map the buffer */
+};
+
+struct erofs_buf {
+ struct inode *inode;
+ struct page *page;
+ void *base;
+ enum erofs_kmap_type kmap_type;
+};
+#define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL })
+
+#define ROOT_NID(sb) ((sb)->root_nid)
+
+#define erofs_blknr(sb, addr) ((addr) >> (sb)->s_blocksize_bits)
+#define erofs_blkoff(sb, addr) ((addr) & ((sb)->s_blocksize - 1))
+#define erofs_pos(sb, blk) ((erofs_off_t)(blk) << (sb)->s_blocksize_bits)
+#define erofs_iblks(i) (round_up((i)->i_size, i_blocksize(i)) >> (i)->i_blkbits)
+
+#define EROFS_FEATURE_FUNCS(name, compat, feature) \
+static inline bool erofs_sb_has_##name(struct erofs_sb_info *sbi) \
+{ \
+ return sbi->feature_##compat & EROFS_FEATURE_##feature; \
+}
+
+EROFS_FEATURE_FUNCS(zero_padding, incompat, INCOMPAT_ZERO_PADDING)
+EROFS_FEATURE_FUNCS(compr_cfgs, incompat, INCOMPAT_COMPR_CFGS)
+EROFS_FEATURE_FUNCS(big_pcluster, incompat, INCOMPAT_BIG_PCLUSTER)
+EROFS_FEATURE_FUNCS(chunked_file, incompat, INCOMPAT_CHUNKED_FILE)
+EROFS_FEATURE_FUNCS(device_table, incompat, INCOMPAT_DEVICE_TABLE)
+EROFS_FEATURE_FUNCS(compr_head2, incompat, INCOMPAT_COMPR_HEAD2)
+EROFS_FEATURE_FUNCS(ztailpacking, incompat, INCOMPAT_ZTAILPACKING)
+EROFS_FEATURE_FUNCS(fragments, incompat, INCOMPAT_FRAGMENTS)
+EROFS_FEATURE_FUNCS(dedupe, incompat, INCOMPAT_DEDUPE)
+EROFS_FEATURE_FUNCS(xattr_prefixes, incompat, INCOMPAT_XATTR_PREFIXES)
+EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM)
+EROFS_FEATURE_FUNCS(xattr_filter, compat, COMPAT_XATTR_FILTER)
+
+/* atomic flag definitions */
+#define EROFS_I_EA_INITED_BIT 0
+#define EROFS_I_Z_INITED_BIT 1
+
+/* bitlock definitions (arranged in reverse order) */
+#define EROFS_I_BL_XATTR_BIT (BITS_PER_LONG - 1)
+#define EROFS_I_BL_Z_BIT (BITS_PER_LONG - 2)
+
+struct erofs_inode {
+ erofs_nid_t nid;
+
+ /* atomic flags (including bitlocks) */
+ unsigned long flags;
+
+ unsigned char datalayout;
+ unsigned char inode_isize;
+ unsigned int xattr_isize;
+
+ unsigned int xattr_name_filter;
+ unsigned int xattr_shared_count;
+ unsigned int *xattr_shared_xattrs;
+
+ union {
+ erofs_blk_t raw_blkaddr;
+ struct {
+ unsigned short chunkformat;
+ unsigned char chunkbits;
+ };
+#ifdef CONFIG_EROFS_FS_ZIP
+ struct {
+ unsigned short z_advise;
+ unsigned char z_algorithmtype[2];
+ unsigned char z_logical_clusterbits;
+ unsigned long z_tailextent_headlcn;
+ union {
+ struct {
+ erofs_off_t z_idataoff;
+ unsigned short z_idata_size;
+ };
+ erofs_off_t z_fragmentoff;
+ };
+ };
+#endif /* CONFIG_EROFS_FS_ZIP */
+ };
+ /* the corresponding vfs inode */
+ struct inode vfs_inode;
+};
+
+#define EROFS_I(ptr) container_of(ptr, struct erofs_inode, vfs_inode)
+
+static inline erofs_off_t erofs_iloc(struct inode *inode)
+{
+ struct erofs_sb_info *sbi = EROFS_I_SB(inode);
+
+ return erofs_pos(inode->i_sb, sbi->meta_blkaddr) +
+ (EROFS_I(inode)->nid << sbi->islotbits);
+}
+
+static inline unsigned int erofs_inode_version(unsigned int ifmt)
+{
+ return (ifmt >> EROFS_I_VERSION_BIT) & EROFS_I_VERSION_MASK;
+}
+
+static inline unsigned int erofs_inode_datalayout(unsigned int ifmt)
+{
+ return (ifmt >> EROFS_I_DATALAYOUT_BIT) & EROFS_I_DATALAYOUT_MASK;
+}
+
+/*
+ * Different from grab_cache_page_nowait(), reclaiming is never triggered
+ * when allocating new pages.
+ */
+static inline
+struct page *erofs_grab_cache_page_nowait(struct address_space *mapping,
+ pgoff_t index)
+{
+ return pagecache_get_page(mapping, index,
+ FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT,
+ readahead_gfp_mask(mapping) & ~__GFP_RECLAIM);
+}
+
+/* Has a disk mapping */
+#define EROFS_MAP_MAPPED 0x0001
+/* Located in metadata (could be copied from bd_inode) */
+#define EROFS_MAP_META 0x0002
+/* The extent is encoded */
+#define EROFS_MAP_ENCODED 0x0004
+/* The length of extent is full */
+#define EROFS_MAP_FULL_MAPPED 0x0008
+/* Located in the special packed inode */
+#define EROFS_MAP_FRAGMENT 0x0010
+/* The extent refers to partial decompressed data */
+#define EROFS_MAP_PARTIAL_REF 0x0020
+
+struct erofs_map_blocks {
+ struct erofs_buf buf;
+
+ erofs_off_t m_pa, m_la;
+ u64 m_plen, m_llen;
+
+ unsigned short m_deviceid;
+ char m_algorithmformat;
+ unsigned int m_flags;
+};
+
+/*
+ * Used to get the exact decompressed length, e.g. fiemap (consider lookback
+ * approach instead if possible since it's more metadata lightweight.)
+ */
+#define EROFS_GET_BLOCKS_FIEMAP 0x0001
+/* Used to map the whole extent if non-negligible data is requested for LZMA */
+#define EROFS_GET_BLOCKS_READMORE 0x0002
+/* Used to map tail extent for tailpacking inline or fragment pcluster */
+#define EROFS_GET_BLOCKS_FINDTAIL 0x0004
+
+enum {
+ Z_EROFS_COMPRESSION_SHIFTED = Z_EROFS_COMPRESSION_MAX,
+ Z_EROFS_COMPRESSION_INTERLACED,
+ Z_EROFS_COMPRESSION_RUNTIME_MAX
+};
+
+struct erofs_map_dev {
+ struct erofs_fscache *m_fscache;
+ struct block_device *m_bdev;
+ struct dax_device *m_daxdev;
+ u64 m_dax_part_off;
+
+ erofs_off_t m_pa;
+ unsigned int m_deviceid;
+};
+
+extern struct file_system_type erofs_fs_type;
+extern const struct super_operations erofs_sops;
+
+extern const struct address_space_operations erofs_raw_access_aops;
+extern const struct address_space_operations z_erofs_aops;
+extern const struct address_space_operations erofs_fscache_access_aops;
+
+extern const struct inode_operations erofs_generic_iops;
+extern const struct inode_operations erofs_symlink_iops;
+extern const struct inode_operations erofs_fast_symlink_iops;
+extern const struct inode_operations erofs_dir_iops;
+
+extern const struct file_operations erofs_file_fops;
+extern const struct file_operations erofs_dir_fops;
+
+extern const struct iomap_ops z_erofs_iomap_report_ops;
+
+/* flags for erofs_fscache_register_cookie() */
+#define EROFS_REG_COOKIE_SHARE 0x0001
+#define EROFS_REG_COOKIE_NEED_NOEXIST 0x0002
+
+void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
+ erofs_off_t *offset, int *lengthp);
+void erofs_unmap_metabuf(struct erofs_buf *buf);
+void erofs_put_metabuf(struct erofs_buf *buf);
+void *erofs_bread(struct erofs_buf *buf, erofs_blk_t blkaddr,
+ enum erofs_kmap_type type);
+void erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb);
+void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
+ erofs_blk_t blkaddr, enum erofs_kmap_type type);
+int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *dev);
+int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ u64 start, u64 len);
+int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map);
+struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid);
+int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
+ struct kstat *stat, u32 request_mask,
+ unsigned int query_flags);
+int erofs_namei(struct inode *dir, const struct qstr *name,
+ erofs_nid_t *nid, unsigned int *d_type);
+
+static inline void *erofs_vm_map_ram(struct page **pages, unsigned int count)
+{
+ int retried = 0;
+
+ while (1) {
+ void *p = vm_map_ram(pages, count, -1);
+
+ /* retry two more times (totally 3 times) */
+ if (p || ++retried >= 3)
+ return p;
+ vm_unmap_aliases();
+ }
+ return NULL;
+}
+
+int erofs_register_sysfs(struct super_block *sb);
+void erofs_unregister_sysfs(struct super_block *sb);
+int __init erofs_init_sysfs(void);
+void erofs_exit_sysfs(void);
+
+struct page *erofs_allocpage(struct page **pagepool, gfp_t gfp);
+static inline void erofs_pagepool_add(struct page **pagepool, struct page *page)
+{
+ set_page_private(page, (unsigned long)*pagepool);
+ *pagepool = page;
+}
+void erofs_release_pages(struct page **pagepool);
+
+#ifdef CONFIG_EROFS_FS_ZIP
+void erofs_workgroup_put(struct erofs_workgroup *grp);
+struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
+ pgoff_t index);
+struct erofs_workgroup *erofs_insert_workgroup(struct super_block *sb,
+ struct erofs_workgroup *grp);
+void erofs_workgroup_free_rcu(struct erofs_workgroup *grp);
+void erofs_shrinker_register(struct super_block *sb);
+void erofs_shrinker_unregister(struct super_block *sb);
+int __init erofs_init_shrinker(void);
+void erofs_exit_shrinker(void);
+int __init z_erofs_init_zip_subsystem(void);
+void z_erofs_exit_zip_subsystem(void);
+int erofs_try_to_free_all_cached_pages(struct erofs_sb_info *sbi,
+ struct erofs_workgroup *egrp);
+int z_erofs_map_blocks_iter(struct inode *inode, struct erofs_map_blocks *map,
+ int flags);
+void *erofs_get_pcpubuf(unsigned int requiredpages);
+void erofs_put_pcpubuf(void *ptr);
+int erofs_pcpubuf_growsize(unsigned int nrpages);
+void __init erofs_pcpubuf_init(void);
+void erofs_pcpubuf_exit(void);
+int erofs_init_managed_cache(struct super_block *sb);
+int z_erofs_parse_cfgs(struct super_block *sb, struct erofs_super_block *dsb);
+#else
+static inline void erofs_shrinker_register(struct super_block *sb) {}
+static inline void erofs_shrinker_unregister(struct super_block *sb) {}
+static inline int erofs_init_shrinker(void) { return 0; }
+static inline void erofs_exit_shrinker(void) {}
+static inline int z_erofs_init_zip_subsystem(void) { return 0; }
+static inline void z_erofs_exit_zip_subsystem(void) {}
+static inline void erofs_pcpubuf_init(void) {}
+static inline void erofs_pcpubuf_exit(void) {}
+static inline int erofs_init_managed_cache(struct super_block *sb) { return 0; }
+#endif /* !CONFIG_EROFS_FS_ZIP */
+
+#ifdef CONFIG_EROFS_FS_ZIP_LZMA
+int __init z_erofs_lzma_init(void);
+void z_erofs_lzma_exit(void);
+#else
+static inline int z_erofs_lzma_init(void) { return 0; }
+static inline int z_erofs_lzma_exit(void) { return 0; }
+#endif /* !CONFIG_EROFS_FS_ZIP_LZMA */
+
+#ifdef CONFIG_EROFS_FS_ZIP_DEFLATE
+int __init z_erofs_deflate_init(void);
+void z_erofs_deflate_exit(void);
+#else
+static inline int z_erofs_deflate_init(void) { return 0; }
+static inline int z_erofs_deflate_exit(void) { return 0; }
+#endif /* !CONFIG_EROFS_FS_ZIP_DEFLATE */
+
+#ifdef CONFIG_EROFS_FS_ONDEMAND
+int erofs_fscache_register_fs(struct super_block *sb);
+void erofs_fscache_unregister_fs(struct super_block *sb);
+
+struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
+ char *name, unsigned int flags);
+void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache);
+#else
+static inline int erofs_fscache_register_fs(struct super_block *sb)
+{
+ return -EOPNOTSUPP;
+}
+static inline void erofs_fscache_unregister_fs(struct super_block *sb) {}
+
+static inline
+struct erofs_fscache *erofs_fscache_register_cookie(struct super_block *sb,
+ char *name, unsigned int flags)
+{
+ return ERR_PTR(-EOPNOTSUPP);
+}
+
+static inline void erofs_fscache_unregister_cookie(struct erofs_fscache *fscache)
+{
+}
+#endif
+
+#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
+
+#endif /* __EROFS_INTERNAL_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 10:46:20 +0000