From: Josef Bacik <jbacik@xxxxxx>
The new enospc code makes it possible to deadlock if we don't use
FLUSH_LIMIT during reservations inside a transaction. This enforces
the correct flush type to avoid both deadlocks and assertions
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Josef Bacik <jbacik@xxxxxx>
---
fs/btrfs/extent-tree.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 3a129c4..9fcb8c9 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5939,10 +5939,15 @@ int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes)
* the middle of a transaction commit. We also don't need the delalloc
* mutex since we won't race with anybody. We need this mostly to make
* lockdep shut its filthy mouth.
+ *
+ * If we have a transaction open (can happen if we call truncate_block
+ * from truncate), then we need FLUSH_LIMIT so we don't deadlock.
*/
if (btrfs_is_free_space_inode(inode)) {
flush = BTRFS_RESERVE_NO_FLUSH;
delalloc_lock = false;
+ } else if (current->journal_info) {
+ flush = BTRFS_RESERVE_FLUSH_LIMIT;
}
if (flush != BTRFS_RESERVE_NO_FLUSH &&
--
2.8.0.rc2
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