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btrfs: hold a ref on the root in find_data_references

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We're looking up the data references for the bytenr in a root, we need
to hold a ref on that root while we're doing that.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-01-24 09:32:42 -05:00 committed by David Sterba
parent 442b1ac524
commit 3d7babdcf2
1 changed files with 7 additions and 1 deletions
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8
fs/btrfs/relocation.c
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@ -3751,7 +3751,11 @@ static int find_data_references(struct reloc_control *rc,
root = read_fs_root(fs_info, ref_root);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out;
goto out_free;
}
if (!btrfs_grab_fs_root(root)) {
err = -ENOENT;
goto out_free;
}
key.objectid = ref_objectid;
@ -3864,6 +3868,8 @@ static int find_data_references(struct reloc_control *rc,
}
out:
btrfs_put_fs_root(root);
out_free:
btrfs_free_path(path);
return err;
}