Btrfs: fix OOPS of empty filesystem after balance
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>
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@ -2234,6 +2234,7 @@ int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 type);
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struct btrfs_root *root, u64 type);
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int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
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int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
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int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
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/* ctree.c */
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/* ctree.c */
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int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
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int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
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int level, int *slot);
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int level, int *slot);
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@ -2065,6 +2065,12 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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fs_info->metadata_alloc_profile = (u64)-1;
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fs_info->metadata_alloc_profile = (u64)-1;
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fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
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fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
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ret = btrfs_init_space_info(fs_info);
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if (ret) {
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printk(KERN_ERR "Failed to initial space info: %d\n", ret);
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goto fail_block_groups;
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}
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ret = btrfs_read_block_groups(extent_root);
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ret = btrfs_read_block_groups(extent_root);
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if (ret) {
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if (ret) {
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printk(KERN_ERR "Failed to read block groups: %d\n", ret);
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printk(KERN_ERR "Failed to read block groups: %d\n", ret);
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@ -8778,6 +8778,29 @@ out:
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return ret;
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return ret;
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}
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}
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int btrfs_init_space_info(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_space_info *space_info;
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int ret;
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ret = update_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM, 0, 0,
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&space_info);
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if (ret)
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return ret;
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ret = update_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA, 0, 0,
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&space_info);
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if (ret)
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return ret;
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ret = update_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA, 0, 0,
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&space_info);
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if (ret)
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return ret;
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return ret;
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}
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int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end)
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int btrfs_error_unpin_extent_range(struct btrfs_root *root, u64 start, u64 end)
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{
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{
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return unpin_extent_range(root, start, end);
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return unpin_extent_range(root, start, end);
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