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-rw-r--r--fs/btrfs/super.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index c86fb5438454..6f49b2872a64 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1000,6 +1000,16 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
*/
if (fs_info->pending_changes == 0)
return 0;
+ /*
+ * A non-blocking test if the fs is frozen. We must not
+ * start a new transaction here otherwise a deadlock
+ * happens. The pending operations are delayed to the
+ * next commit after thawing.
+ */
+ if (__sb_start_write(sb, SB_FREEZE_WRITE, false))
+ __sb_end_write(sb, SB_FREEZE_WRITE);
+ else
+ return 0;
trans = btrfs_start_transaction(root, 0);
}
if (IS_ERR(trans))

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