d146a7b9c6
This is the case when reading freshly created filesystem.
The error message is like the following:
btrfs_read_superblock: No valid root_backup found!
Since the data from super_roots/root_backups is not actually used -
decided to rework btrfs_newest_root_backup() into
btrfs_check_super_roots() that will only check if super_roots
array is valid and correctly handle empty scenario.
As a result:
* btrfs_read_superblock() now only checks if super_roots array is valid;
the case when it is empty is considered OK.
* removed root_backup pointer from btrfs_info,
which would be NULL in case of empty super_roots.
* btrfs_read_superblock() verifies number of devices from the superblock
itself, not newest root_backup.
Signed-off-by: Yevgeny Popovych <yevgenyp@pointgrab.com>
Cc: Marek Behun <marek.behun@nic.cz>
Cc: Sergey Struzh <sergeys@pointgrab.com>
88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* BTRFS filesystem implementation for U-Boot
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*
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* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
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*/
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#ifndef __BTRFS_BTRFS_H__
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#define __BTRFS_BTRFS_H__
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#include <linux/rbtree.h>
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#include "conv-funcs.h"
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struct btrfs_info {
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struct btrfs_super_block sb;
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struct btrfs_root tree_root;
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struct btrfs_root fs_root;
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struct btrfs_root chunk_root;
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struct rb_root chunks_root;
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};
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extern struct btrfs_info btrfs_info;
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/* hash.c */
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void btrfs_hash_init(void);
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u32 btrfs_crc32c(u32, const void *, size_t);
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u32 btrfs_csum_data(char *, u32, size_t);
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void btrfs_csum_final(u32, void *);
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static inline u64 btrfs_name_hash(const char *name, int len)
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{
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return btrfs_crc32c((u32) ~1, name, len);
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}
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/* dev.c */
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extern struct blk_desc *btrfs_blk_desc;
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extern disk_partition_t *btrfs_part_info;
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int btrfs_devread(u64, int, void *);
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/* chunk-map.c */
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u64 btrfs_map_logical_to_physical(u64);
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int btrfs_chunk_map_init(void);
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void btrfs_chunk_map_exit(void);
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int btrfs_read_chunk_tree(void);
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/* compression.c */
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u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
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/* super.c */
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int btrfs_read_superblock(void);
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/* dir-item.c */
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typedef int (*btrfs_readdir_callback_t)(const struct btrfs_root *,
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struct btrfs_dir_item *);
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int btrfs_lookup_dir_item(const struct btrfs_root *, u64, const char *, int,
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struct btrfs_dir_item *);
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int btrfs_readdir(const struct btrfs_root *, u64, btrfs_readdir_callback_t);
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/* root.c */
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int btrfs_find_root(u64, struct btrfs_root *, struct btrfs_root_item *);
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u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);
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/* inode.c */
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u64 btrfs_lookup_inode_ref(struct btrfs_root *, u64, struct btrfs_inode_ref *,
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char *);
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int btrfs_lookup_inode(const struct btrfs_root *, struct btrfs_key *,
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struct btrfs_inode_item *, struct btrfs_root *);
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int btrfs_readlink(const struct btrfs_root *, u64, char *);
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u64 btrfs_lookup_path(struct btrfs_root *, u64, const char *, u8 *,
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struct btrfs_inode_item *, int);
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u64 btrfs_file_read(const struct btrfs_root *, u64, u64, u64, char *);
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/* subvolume.c */
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u64 btrfs_get_default_subvol_objectid(void);
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/* extent-io.c */
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u64 btrfs_read_extent_inline(struct btrfs_path *,
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struct btrfs_file_extent_item *, u64, u64,
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char *);
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u64 btrfs_read_extent_reg(struct btrfs_path *, struct btrfs_file_extent_item *,
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u64, u64, char *);
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#endif /* !__BTRFS_BTRFS_H__ */
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