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Btrfs: fix OOPS of empty filesystem after balance

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btrfs will remove unused block groups after balance.
When a empty filesystem is balanced, the block group with tag "DATA" may be
dropped, and after umount and mount again, it will not find "DATA" space_info
and lead to OOPS.
So we initial the necessary space_infos(DATA, SYSTEM, METADATA) to avoid OOPS.

Reported-by: Daniel J Blueman <daniel.blueman@gmail.com>
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
liubo 2011-03-07 02:13:14 +00:00 committed by root
parent 9f7c43c967
commit c59021f846
3 changed files with 30 additions and 0 deletions
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1
fs/btrfs/ctree.h
View file

@ -2234,6 +2234,7 @@ int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 type);
int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
/* ctree.c */
int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
int level, int *slot);

6
fs/btrfs/disk-io.c
View file

@ -2065,6 +2065,12 @@ struct btrfs_root *open_ctree(struct super_block *sb,
fs_info->metadata_alloc_profile = (u64)-1;
fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
ret = btrfs_init_space_info(fs_info);
if (ret) {
printk(KERN_ERR "Failed to initial space info: %d\n", ret);
goto fail_block_groups;
}
ret = btrfs_read_block_groups(extent_root);
if (ret) {
printk(KERN_ERR "Failed to read block groups: %d\n", ret);

23
fs/btrfs/extent-tree.c
View file

@ -8778,6 +8778,29 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
return ret;
}
int btrfs_init_space_info(struct btrfs_fs_info *fs_info)
{
struct btrfs_space_info *space_info;
int ret;
ret = update_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM, 0, 0,
&space_info);
if (ret)
return ret;
ret = update_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA, 0, 0,
&space_info);
if (ret)
return ret;
ret = update_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA, 0, 0,
&space_info);
if (ret)
return ret;
return ret;
}
int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end)
{
return unpin_extent_range(root, start, end);