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, 2 insertions, 2 deletions

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index e7f894bdb420..c0e5b8cf635c 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -199,7 +199,7 @@ flags_err:
                  * need to allocate reservation structure for this inode
                  * before set the window size
                  */
-                mutex_lock(&ei->truncate_mutex);
+                down_write(&ei->i_data_sem);
                 if (!ei->i_block_alloc_info)
                         ext4_init_block_alloc_info(inode);
 
@@ -207,7 +207,7 @@ flags_err:
                         struct ext4_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
                         rsv->rsv_goal_size = rsv_window_size;
                 }
-                mutex_unlock(&ei->truncate_mutex);
+                up_write(&ei->i_data_sem);
                 return 0;
         }
         case EXT4_IOC_GROUP_EXTEND: {