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| author | Arne Jansen <sensille@gmx.net> | 2011-09-13 11:40:09 +0200 |
|---|---|---|
| committer | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-07-10 15:14:43 +0200 |
| commit | d13603ef6e14a12cd65a6975e8117c0fea7c7ddf (patch) | |
| tree | 9f6a11b5b8963f0663a47c7bbe73d698fb0cff71 | |
| parent | Btrfs: add helper for tree enumeration (diff) | |
| download | linux-d13603ef6e14a12cd65a6975e8117c0fea7c7ddf.tar.xz linux-d13603ef6e14a12cd65a6975e8117c0fea7c7ddf.zip | |
Btrfs: check the root passed to btrfs_end_transaction
This patch only add a consistancy check to validate that the
same root is passed to start_transaction and end_transaction.
Subvolume quota depends on this.
Signed-off-by: Arne Jansen <sensille@gmx.net>
| -rw-r--r-- | fs/btrfs/transaction.c | 6 | ||||
| -rw-r--r-- | fs/btrfs/transaction.h | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 621c8dc48fb6..23cbda0685b8 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -345,6 +345,7 @@ again: h->transaction = cur_trans; h->blocks_used = 0; h->bytes_reserved = 0; + h->root = root; h->delayed_ref_updates = 0; h->use_count = 1; h->block_rsv = NULL; @@ -511,6 +512,11 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, btrfs_trans_release_metadata(trans, root); trans->block_rsv = NULL; + /* + * the same root has to be passed to start_transaction and + * end_transaction. Subvolume quota depends on this. + */ + WARN_ON(trans->root != root); while (count < 2) { unsigned long cur = trans->delayed_ref_updates; trans->delayed_ref_updates = 0; diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h index fe27379e368b..010729446e13 100644 --- a/fs/btrfs/transaction.h +++ b/fs/btrfs/transaction.h @@ -57,6 +57,12 @@ struct btrfs_trans_handle { struct btrfs_block_rsv *block_rsv; struct btrfs_block_rsv *orig_rsv; int aborted; + /* + * this root is only needed to validate that the root passed to + * start_transaction is the same as the one passed to end_transaction. + * Subvolume quota depends on this + */ + struct btrfs_root *root; }; struct btrfs_pending_snapshot { |