staging: erofs: add erofs in-memory stuffs
- 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 plays a role in the file L2P mapping Signed-off-by: Miao Xie <miaoxie@huawei.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang
Greg Kroah-Hartman
parent
aea1286dcb
commit
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/* SPDX-License-Identifier: GPL-2.0
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*
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* linux/drivers/staging/erofs/internal.h
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*
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* Copyright (C) 2017-2018 HUAWEI, Inc.
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* http://www.huawei.com/
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* Created by Gao Xiang <gaoxiang25@huawei.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of the Linux
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* distribution for more details.
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*/
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#ifndef __INTERNAL_H
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#define __INTERNAL_H
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#include <linux/fs.h>
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#include <linux/dcache.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/bio.h>
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#include <linux/buffer_head.h>
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#include <linux/cleancache.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "erofs_fs.h"
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/* redefine pr_fmt "erofs: " */
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#undef pr_fmt
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#define pr_fmt(fmt) "erofs: " fmt
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#define errln(x, ...) pr_err(x "\n", ##__VA_ARGS__)
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#define infoln(x, ...) pr_info(x "\n", ##__VA_ARGS__)
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#ifdef CONFIG_EROFS_FS_DEBUG
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#define debugln(x, ...) pr_debug(x "\n", ##__VA_ARGS__)
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#define dbg_might_sleep might_sleep
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#define DBG_BUGON BUG_ON
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#else
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#define debugln(x, ...) ((void)0)
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#define dbg_might_sleep() ((void)0)
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#define DBG_BUGON(...) ((void)0)
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#endif
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/* EROFS_SUPER_MAGIC_V1 to represent the whole file system */
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#define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1
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typedef u64 erofs_nid_t;
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struct erofs_sb_info {
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u32 blocks;
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u32 meta_blkaddr;
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/* inode slot unit size in bit shift */
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unsigned char islotbits;
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u32 build_time_nsec;
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u64 build_time;
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/* what we really care is nid, rather than ino.. */
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erofs_nid_t root_nid;
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/* used for statfs, f_files - f_favail */
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u64 inos;
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u8 uuid[16]; /* 128-bit uuid for volume */
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u8 volume_name[16]; /* volume name */
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char *dev_name;
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unsigned int mount_opt;
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};
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#define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info)
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#define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info)
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#define clear_opt(sbi, option) ((sbi)->mount_opt &= ~EROFS_MOUNT_##option)
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#define set_opt(sbi, option) ((sbi)->mount_opt |= EROFS_MOUNT_##option)
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#define test_opt(sbi, option) ((sbi)->mount_opt & EROFS_MOUNT_##option)
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/* we strictly follow PAGE_SIZE and no buffer head yet */
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#define LOG_BLOCK_SIZE PAGE_SHIFT
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#undef LOG_SECTORS_PER_BLOCK
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#define LOG_SECTORS_PER_BLOCK (PAGE_SHIFT - 9)
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#undef SECTORS_PER_BLOCK
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#define SECTORS_PER_BLOCK (1 << SECTORS_PER_BLOCK)
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#define EROFS_BLKSIZ (1 << LOG_BLOCK_SIZE)
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#if (EROFS_BLKSIZ % 4096 || !EROFS_BLKSIZ)
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#error erofs cannot be used in this platform
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#endif
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#define ROOT_NID(sb) ((sb)->root_nid)
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typedef u64 erofs_off_t;
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/* data type for filesystem-wide blocks number */
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typedef u32 erofs_blk_t;
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#define erofs_blknr(addr) ((addr) / EROFS_BLKSIZ)
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#define erofs_blkoff(addr) ((addr) % EROFS_BLKSIZ)
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#define blknr_to_addr(nr) ((erofs_off_t)(nr) * EROFS_BLKSIZ)
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static inline erofs_off_t iloc(struct erofs_sb_info *sbi, erofs_nid_t nid)
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{
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return blknr_to_addr(sbi->meta_blkaddr) + (nid << sbi->islotbits);
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}
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#define inode_set_inited_xattr(inode) (EROFS_V(inode)->flags |= 1)
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#define inode_has_inited_xattr(inode) (EROFS_V(inode)->flags & 1)
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struct erofs_vnode {
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erofs_nid_t nid;
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unsigned int flags;
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unsigned char data_mapping_mode;
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/* inline size in bytes */
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unsigned char inode_isize;
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unsigned short xattr_isize;
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unsigned xattr_shared_count;
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unsigned *xattr_shared_xattrs;
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erofs_blk_t raw_blkaddr;
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/* the corresponding vfs inode */
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struct inode vfs_inode;
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};
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#define EROFS_V(ptr) \
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container_of(ptr, struct erofs_vnode, vfs_inode)
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#define __inode_advise(x, bit, bits) \
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(((x) >> (bit)) & ((1 << (bits)) - 1))
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#define __inode_version(advise) \
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__inode_advise(advise, EROFS_I_VERSION_BIT, \
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EROFS_I_VERSION_BITS)
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#define __inode_data_mapping(advise) \
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__inode_advise(advise, EROFS_I_DATA_MAPPING_BIT,\
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EROFS_I_DATA_MAPPING_BITS)
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static inline unsigned long inode_datablocks(struct inode *inode)
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{
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/* since i_size cannot be changed */
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return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
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}
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static inline bool is_inode_layout_plain(struct inode *inode)
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{
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return EROFS_V(inode)->data_mapping_mode == EROFS_INODE_LAYOUT_PLAIN;
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}
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static inline bool is_inode_layout_compression(struct inode *inode)
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{
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return EROFS_V(inode)->data_mapping_mode ==
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EROFS_INODE_LAYOUT_COMPRESSION;
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}
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static inline bool is_inode_layout_inline(struct inode *inode)
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{
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return EROFS_V(inode)->data_mapping_mode == EROFS_INODE_LAYOUT_INLINE;
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}
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extern const struct super_operations erofs_sops;
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extern const struct inode_operations erofs_dir_iops;
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extern const struct file_operations erofs_dir_fops;
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extern const struct address_space_operations erofs_raw_access_aops;
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/*
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* Logical to physical block mapping, used by erofs_map_blocks()
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*
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* Different with other file systems, it is used for 2 access modes:
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*
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* 1) RAW access mode:
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*
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* Users pass a valid (m_lblk, m_lofs -- usually 0) pair,
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* and get the valid m_pblk, m_pofs and the longest m_len(in bytes).
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*
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* Note that m_lblk in the RAW access mode refers to the number of
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* the compressed ondisk block rather than the uncompressed
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* in-memory block for the compressed file.
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*
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* m_pofs equals to m_lofs except for the inline data page.
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*
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* 2) Normal access mode:
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*
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* If the inode is not compressed, it has no difference with
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* the RAW access mode. However, if the inode is compressed,
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* users should pass a valid (m_lblk, m_lofs) pair, and get
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* the needed m_pblk, m_pofs, m_len to get the compressed data
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* and the updated m_lblk, m_lofs which indicates the start
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* of the corresponding uncompressed data in the file.
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*/
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enum {
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BH_Zipped = BH_PrivateStart,
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};
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/* Has a disk mapping */
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#define EROFS_MAP_MAPPED (1 << BH_Mapped)
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/* Located in metadata (could be copied from bd_inode) */
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#define EROFS_MAP_META (1 << BH_Meta)
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/* The extent has been compressed */
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#define EROFS_MAP_ZIPPED (1 << BH_Zipped)
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struct erofs_map_blocks {
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erofs_off_t m_pa, m_la;
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u64 m_plen, m_llen;
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unsigned int m_flags;
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};
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/* Flags used by erofs_map_blocks() */
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#define EROFS_GET_BLOCKS_RAW 0x0001
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/* data.c */
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extern struct page *erofs_get_meta_page(struct super_block *sb,
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erofs_blk_t blkaddr, bool prio);
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extern int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int);
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static inline struct page *erofs_get_inline_page(struct inode *inode,
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erofs_blk_t blkaddr)
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{
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return erofs_get_meta_page(inode->i_sb,
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blkaddr, S_ISDIR(inode->i_mode));
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}
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/* inode.c */
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extern struct inode *erofs_iget(struct super_block *sb,
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erofs_nid_t nid, bool dir);
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/* dir.c */
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int erofs_namei(struct inode *dir, struct qstr *name,
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erofs_nid_t *nid, unsigned *d_type);
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/* xattr.c */
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extern const struct xattr_handler *erofs_xattr_handlers[];
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/* symlink */
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static inline void set_inode_fast_symlink(struct inode *inode)
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{
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inode->i_op = &simple_symlink_inode_operations;
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}
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static inline bool is_inode_fast_symlink(struct inode *inode)
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{
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return inode->i_op == &simple_symlink_inode_operations;
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}
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static inline void *erofs_vmap(struct page **pages, unsigned int count)
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{
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#ifdef CONFIG_EROFS_FS_USE_VM_MAP_RAM
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int i = 0;
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while (1) {
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void *addr = vm_map_ram(pages, count, -1, PAGE_KERNEL);
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/* retry two more times (totally 3 times) */
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if (addr != NULL || ++i >= 3)
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return addr;
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vm_unmap_aliases();
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}
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return NULL;
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#else
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return vmap(pages, count, VM_MAP, PAGE_KERNEL);
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#endif
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}
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static inline void erofs_vunmap(const void *mem, unsigned int count)
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{
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#ifdef CONFIG_EROFS_FS_USE_VM_MAP_RAM
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vm_unmap_ram(mem, count);
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#else
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vunmap(mem);
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#endif
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}
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#endif
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