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btrfs: Handle error from btrfs_uuid_tree_rem call in _btrfs_ioctl_set_received_subvol 

As with every function which deals with modifying the btree
btrfs_uuid_tree_rem can fail for any number of reasons (ie. EIO/ENOMEM).
Handle return error value from this function gracefully by aborting the
transaction.

Fixes: dd5f9615fc ("Btrfs: maintain subvolume items in the UUID tree")
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-03-12 14:48:09 +02:00 committed by David Sterba
parent 776c4a7ce8
commit d87ff75863
1 changed files with 11 additions and 4 deletions
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15
fs/btrfs/ioctl.c
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@ -5048,10 +5048,17 @@ static long _btrfs_ioctl_set_received_subvol(struct file *file,
received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
BTRFS_UUID_SIZE);
if (received_uuid_changed &&
!btrfs_is_empty_uuid(root_item->received_uuid))
btrfs_uuid_tree_rem(trans, fs_info, root_item->received_uuid,
BTRFS_UUID_KEY_RECEIVED_SUBVOL,
root->root_key.objectid);
!btrfs_is_empty_uuid(root_item->received_uuid)) {
ret = btrfs_uuid_tree_rem(trans, fs_info,
root_item->received_uuid,
BTRFS_UUID_KEY_RECEIVED_SUBVOL,
root->root_key.objectid);
if (ret && ret != -ENOENT) {
btrfs_abort_transaction(trans, ret);
btrfs_end_transaction(trans);
goto out;
}
}
memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
btrfs_set_root_stransid(root_item, sa->stransid);
btrfs_set_root_rtransid(root_item, sa->rtransid);