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>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 93a0191..d47ce83 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -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);

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 8ecc541..b3fc847 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -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);

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index a561060..f619c3c 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -8778,6 +8778,29 @@ out:
        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);