From: Arne Jansen <sensille@xxxxxxx>
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@xxxxxxx>
---
fs/btrfs/transaction.c | 6 ++++++
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 621c8dc..23cbda0 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 fe27379..0107294 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 {
--
1.7.3.4
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