---

yaml
---
r: 77900
b: refs/heads/master
c: 4df3d26
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0e855ac8b103ef579052936b59fe7c599ac422a4
+refs/heads/master: 4df3d265bf8f3762e1d77f554ee279c39dedb020

trunk/fs/ext4/inode.c

@@ -901,23 +901,39 @@ int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
 			int create, int extend_disksize)
 {
 	int retval;
-	if (create) {
-		down_write((&EXT4_I(inode)->i_data_sem));
+	/*
+	 * Try to see if we can get  the block without requesting
+	 * for new file system block.
+	 */
+	down_read((&EXT4_I(inode)->i_data_sem));
+	if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
+		retval =  ext4_ext_get_blocks(handle, inode, block, max_blocks,
+				bh, 0, 0);
 	} else {
-		down_read((&EXT4_I(inode)->i_data_sem));
+		retval = ext4_get_blocks_handle(handle,
+				inode, block, max_blocks, bh, 0, 0);
 	}
+	up_read((&EXT4_I(inode)->i_data_sem));
+	if (!create || (retval > 0))
+		return retval;
+
+	/*
+	 * We need to allocate new blocks which will result
+	 * in i_data update
+	 */
+	down_write((&EXT4_I(inode)->i_data_sem));
+	/*
+	 * We need to check for EXT4 here because migrate
+	 * could have changed the inode type in between
+	 */
 	if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
 		retval =  ext4_ext_get_blocks(handle, inode, block, max_blocks,
 				bh, create, extend_disksize);
 	} else {
 		retval = ext4_get_blocks_handle(handle, inode, block,
 				max_blocks, bh, create, extend_disksize);
 	}
-	if (create) {
-		up_write((&EXT4_I(inode)->i_data_sem));
-	} else {
-		up_read((&EXT4_I(inode)->i_data_sem));
-	}
+	up_write((&EXT4_I(inode)->i_data_sem));
 	return retval;
 }