1 files changed, 11 insertions, 2 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5324a38d848d..ab3e8357929d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4455,7 +4455,12 @@ int ext4_write_inode(struct inode *inode, struct writeback_control *wbc)
                         return -EIO;
                 }
 
-                if (wbc->sync_mode != WB_SYNC_ALL)
+                /*
+                 * No need to force transaction in WB_SYNC_NONE mode. Also
+                 * ext4_sync_fs() will force the commit after everything is
+                 * written.
+                 */
+                if (wbc->sync_mode != WB_SYNC_ALL || wbc->for_sync)
                         return 0;
 
                 err = ext4_force_commit(inode->i_sb);
@@ -4465,7 +4470,11 @@ int ext4_write_inode(struct inode *inode, struct writeback_control *wbc)
                 err = __ext4_get_inode_loc(inode, &iloc, 0);
                 if (err)
                         return err;
-                if (wbc->sync_mode == WB_SYNC_ALL)
+                /*
+                 * sync(2) will flush the whole buffer cache. No need to do
+                 * it here separately for each inode.
+                 */
+                if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync)
                         sync_dirty_buffer(iloc.bh);
                 if (buffer_req(iloc.bh) && !buffer_uptodate(iloc.bh)) {
                         EXT4_ERROR_INODE_BLOCK(inode, iloc.bh->b_blocknr,