Commit bfb8674d authored by Gao Xiang's avatar Gao Xiang Committed by Greg Kroah-Hartman

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: default avatarMiao Xie <miaoxie@huawei.com>
Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarGao Xiang <gaoxiang25@huawei.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent aea1286d
/* 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(...) ((void)0)
#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 {
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 */
char *dev_name;
unsigned int mount_opt;
};
#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)
#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 ROOT_NID(sb) ((sb)->root_nid)
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;
/*
* 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 */
extern struct page *erofs_get_meta_page(struct super_block *sb,
erofs_blk_t blkaddr, bool prio);
extern 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 */
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);
/* xattr.c */
extern const struct xattr_handler *erofs_xattr_handlers[];
/* symlink */
static inline void set_inode_fast_symlink(struct inode *inode)
{
inode->i_op = &simple_symlink_inode_operations;
}
static inline bool is_inode_fast_symlink(struct inode *inode)
{
return inode->i_op == &simple_symlink_inode_operations;
}
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
}
#endif
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