u-boot/fs/btrfs/btrfs.h
Qu Wenruo e3427184f3 fs: btrfs: Implement btrfs_file_read()
This version of btrfs_file_read() has the following new features:
- Tries all mirrors
- More handling on unaligned size
- Better compressed extent handling
  The old implementation doesn't handle compressed extent with offset
  properly: we need to read out the whole compressed extent, then
  decompress the whole extent, and only then copy the requested part.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
2020-09-07 21:00:36 -04:00

75 lines
2.2 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* BTRFS filesystem implementation for U-Boot
*
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
*/
#ifndef __BTRFS_BTRFS_H__
#define __BTRFS_BTRFS_H__
#include <linux/rbtree.h>
#include "conv-funcs.h"
struct btrfs_info {
struct btrfs_super_block sb;
struct __btrfs_root tree_root;
struct __btrfs_root fs_root;
struct __btrfs_root chunk_root;
struct rb_root chunks_root;
};
extern struct btrfs_info btrfs_info;
extern struct btrfs_fs_info *current_fs_info;
/* dev.c */
extern struct blk_desc *btrfs_blk_desc;
extern struct disk_partition *btrfs_part_info;
int btrfs_devread(u64, int, void *);
/* chunk-map.c */
u64 btrfs_map_logical_to_physical(u64);
int btrfs_chunk_map_init(void);
void btrfs_chunk_map_exit(void);
int __btrfs_read_chunk_tree(void);
/* compression.c */
u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
/* super.c */
int btrfs_read_superblock(void);
/* dir-item.c */
int __btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
struct btrfs_dir_item *);
/* root.c */
int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
/* inode.c */
u64 __btrfs_lookup_inode_ref(struct __btrfs_root *, u64, struct btrfs_inode_ref *,
char *);
int __btrfs_lookup_inode(const struct __btrfs_root *, struct btrfs_key *,
struct btrfs_inode_item *, struct __btrfs_root *);
int __btrfs_readlink(const struct __btrfs_root *, u64, char *);
int btrfs_readlink(struct btrfs_root *root, u64 ino, char *target);
u64 __btrfs_lookup_path(struct __btrfs_root *, u64, const char *, u8 *,
struct btrfs_inode_item *, int);
u64 __btrfs_file_read(const struct __btrfs_root *, u64, u64, u64, char *);
int btrfs_file_read(struct btrfs_root *root, u64 ino, u64 file_offset, u64 len,
char *dest);
/* subvolume.c */
u64 btrfs_get_default_subvol_objectid(void);
/* extent-io.c */
u64 __btrfs_read_extent_inline(struct __btrfs_path *,
struct btrfs_file_extent_item *, u64, u64,
char *);
u64 __btrfs_read_extent_reg(struct __btrfs_path *, struct btrfs_file_extent_item *,
u64, u64, char *);
#endif /* !__BTRFS_BTRFS_H__ */