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    Subject[PATCH v6 02/24] erofs: add erofs in-memory stuffs
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     - erofs_sb_info:
    contains erofs-specific in-memory information.

    - erofs_vnode:
    contains vfs_inode and other fs-specific information.
    same as super block, the only one in-memory definition exists.

    - erofs_map_blocks
    Logical to physical block mapping, used by erofs_map_blocks().

    Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
    ---
    fs/erofs/internal.h | 356 ++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 356 insertions(+)
    create mode 100644 fs/erofs/internal.h

    diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
    new file mode 100644
    index 000000000000..2c94149d7218
    --- /dev/null
    +++ b/fs/erofs/internal.h
    @@ -0,0 +1,356 @@
    +/* SPDX-License-Identifier: GPL-2.0-only */
    +/*
    + * linux/fs/erofs/internal.h
    + *
    + * Copyright (C) 2017-2018 HUAWEI, Inc.
    + * http://www.huawei.com/
    + * Created by Gao Xiang <gaoxiang25@huawei.com>
    + */
    +#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/buffer_head.h>
    +#include <linux/cleancache.h>
    +#include <linux/magic.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_BUGON BUG_ON
    +#else
    +#define debugln(x, ...) ((void)0)
    +#define DBG_BUGON(x) ((void)(x))
    +#endif /* !CONFIG_EROFS_FS_DEBUG */
    +
    +enum {
    + FAULT_KMALLOC,
    + FAULT_READ_IO,
    + FAULT_MAX,
    +};
    +
    +#ifdef CONFIG_EROFS_FAULT_INJECTION
    +extern const 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 /* CONFIG_EROFS_FAULT_INJECTION */
    +
    +/* 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_sb_info {
    + u32 blocks;
    + u32 meta_blkaddr;
    +
    + /* inode slot unit size in bit shift */
    + unsigned char islotbits;
    +
    + 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 */
    + u32 requirements;
    +
    + unsigned int mount_opt;
    +
    +#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 /* !CONFIG_EROFS_FAULT_INJECTION */
    +
    +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_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)
    +
    +/* 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 EROFS_IO_MAX_RETRIES_NOFAIL 5
    +
    +#define ROOT_NID(sb) ((sb)->root_nid)
    +
    +#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);
    +}
    +
    +struct erofs_vnode {
    + erofs_nid_t nid;
    +
    + unsigned char datamode;
    + unsigned char inode_isize;
    + unsigned short xattr_isize;
    +
    + 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_compression(struct inode *inode)
    +{
    + return erofs_inode_is_data_compressed(EROFS_V(inode)->datamode);
    +}
    +
    +static inline bool is_inode_flat_inline(struct inode *inode)
    +{
    + return EROFS_V(inode)->datamode == EROFS_INODE_FLAT_INLINE;
    +}
    +
    +extern const struct super_operations erofs_sops;
    +
    +extern const struct address_space_operations erofs_raw_access_aops;
    +
    +/*
    + * 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,
    + BH_FullMapped,
    +};
    +
    +/* 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)
    +
    +struct erofs_map_blocks {
    + erofs_off_t m_pa, m_la;
    + u64 m_plen, m_llen;
    +
    + unsigned int m_flags;
    +
    + struct page *mpage;
    +};
    +
    +/* 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,
    + void *bi_private, 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)) {
    + DBG_BUGON(nofail);
    + return ERR_PTR(-ENOMEM);
    + }
    + break;
    + }
    + bio = bio_alloc(gfp, nr_pages);
    + nr_pages /= 2;
    + } while (unlikely(!bio));
    +
    + bio->bi_end_io = endio;
    + bio_set_dev(bio, sb->s_bdev);
    + bio->bi_iter.bi_sector = (sector_t)blkaddr << LOG_SECTORS_PER_BLOCK;
    + bio->bi_private = bi_private;
    + return bio;
    +}
    +
    +static inline void __submit_bio(struct bio *bio, unsigned int op,
    + unsigned int op_flags)
    +{
    + bio_set_op_attrs(bio, op, op_flags);
    + submit_bio(bio);
    +}
    +
    +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);
    +}
    +
    +int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int);
    +
    +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 const struct inode_operations erofs_generic_iops;
    +extern const struct inode_operations erofs_symlink_iops;
    +extern const struct inode_operations erofs_fast_symlink_iops;
    +
    +static inline void set_inode_fast_symlink(struct inode *inode)
    +{
    + inode->i_op = &erofs_fast_symlink_iops;
    +}
    +
    +static inline bool is_inode_fast_symlink(struct inode *inode)
    +{
    + return inode->i_op == &erofs_fast_symlink_iops;
    +}
    +
    +struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid, bool dir);
    +int erofs_getattr(const struct path *path, struct kstat *stat,
    + u32 request_mask, unsigned int query_flags);
    +
    +/* namei.c */
    +extern const struct inode_operations erofs_dir_iops;
    +
    +int erofs_namei(struct inode *dir, struct qstr *name,
    + erofs_nid_t *nid, unsigned int *d_type);
    +
    +/* dir.c */
    +extern const struct file_operations erofs_dir_fops;
    +
    +#endif /* __EROFS_INTERNAL_H */
    +
    --
    2.17.1
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      Last update: 2019-08-02 15:09    [W:8.518 / U:0.064 seconds]
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