On Fri, Apr 19, 2013 at 05:41:05PM +0200, Stefan Behrens wrote:
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -57,6 +57,8 @@
> #include "send.h"
> #include "dev-replace.h"
>
> +static char empty_uuid[BTRFS_UUID_SIZE] = {0};
+ const
> @@ -567,9 +573,10 @@ static int create_snapshot(struct btrfs_root *root,
> struct inode *dir,
> * 1 - root item
> * 2 - root ref/backref
> * 1 - root of snapshot
> + * 1 - UUID item
> */
> ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
> - &pending_snapshot->block_rsv, 7,
> + &pending_snapshot->block_rsv, 8,
> &pending_snapshot->qgroup_reserved);
> if (ret)
> goto out;
> @@ -580,7 +587,7 @@ static int create_snapshot(struct btrfs_root *root,
> struct inode *dir,
> pending_snapshot->dir = dir;
> pending_snapshot->inherit = inherit;
>
> - trans = btrfs_start_transaction(root, 0);
> + trans = btrfs_start_transaction(root->fs_info->extent_root, 8);
This look suspicious in 2 ways:
* why is root switched to extent_root
* what's the reason of 8 units being reserved
> if (IS_ERR(trans)) {
> ret = PTR_ERR(trans);
> goto fail;
> @@ -3925,7 +3954,7 @@ static long btrfs_ioctl_set_received_subvol(struct file
> *file,
> goto out;
> }
>
> - trans = btrfs_start_transaction(root, 1);
> + trans = btrfs_start_transaction(root, 3);
Please document what's being reserved
> if (IS_ERR(trans)) {
> ret = PTR_ERR(trans);
> trans = NULL;
> --- a/fs/btrfs/transaction.c
> +++ b/fs/btrfs/transaction.c
> @@ -34,6 +34,8 @@
>
> #define BTRFS_ROOT_TRANS_TAG 0
>
> +static char empty_uuid[BTRFS_UUID_SIZE] = {0};
second empty_uuid? well, alternatively you could implement a helper
"is uuid empty" and compare to zeros directly
> +
> void put_transaction(struct btrfs_transaction *transaction)
> {
> WARN_ON(atomic_read(&transaction->use_count) == 0);
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