ext4: Convert truncate_mutex to read write semaphore.

We are currently taking the truncate_mutex for every read. This would have
performance impact on large CPU configuration. Convert the lock to read write
semaphore and take read lock when we are trying to read the file.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index effd375ece80..c7305443e100 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -593,7 +593,7 @@ static void init_once(struct kmem_cache *cachep, void *foo)
 #ifdef CONFIG_EXT4DEV_FS_XATTR
         init_rwsem(&ei->xattr_sem);
 #endif
-        mutex_init(&ei->truncate_mutex);
+        init_rwsem(&ei->i_data_sem);
         inode_init_once(&ei->vfs_inode);
 }