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-rw-r--r--fs/btrfs/btrfs_inode.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 61205e3..1da5753 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -196,6 +196,16 @@ struct btrfs_inode {
struct list_head delayed_iput;
long delayed_iput_count;
+ /*
+ * To avoid races between lockless (i_mutex not held) direct IO writes
+ * and concurrent fsync requests. Direct IO writes must acquire read
+ * access on this semaphore for creating an extent map and its
+ * corresponding ordered extent. The fast fsync path must acquire write
+ * access on this semaphore before it collects ordered extents and
+ * extent maps.
+ */
+ struct rw_semaphore dio_sem;
+
struct inode vfs_inode;
};