Commit b03755ad authored by zhangjs's avatar zhangjs Committed by Theodore Ts'o
Browse files

ext4: make __ext4_get_inode_loc plug 



Add a blk_plug to prevent the inode table readahead from being
submitted as small I/O requests.

Signed-off-by: default avatarzhangjs <zachary@baishancloud.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
parent c60990b3

fs/ext4/inode.c

+3 −0
Original line number Diff line number Diff line
@@ -4570,6 +4570,7 @@ static int __ext4_get_inode_loc(struct inode *inode, 
	struct buffer_head	*bh;

	struct super_block	*sb = inode->i_sb;

	ext4_fsblk_t		block;

	struct blk_plug		plug;

	int			inodes_per_block, inode_offset;



	iloc->bh = NULL;
@@ -4658,6 +4659,7 @@ static int __ext4_get_inode_loc(struct inode *inode, 
		 * If we need to do any I/O, try to pre-readahead extra

		 * blocks from the inode table.

		 */

		blk_start_plug(&plug);

		if (EXT4_SB(sb)->s_inode_readahead_blks) {

			ext4_fsblk_t b, end, table;

			unsigned num;
@@ -4688,6 +4690,7 @@ static int __ext4_get_inode_loc(struct inode *inode, 
		get_bh(bh);

		bh->b_end_io = end_buffer_read_sync;

		submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO, bh);

		blk_finish_plug(&plug);

		wait_on_buffer(bh);

		if (!buffer_uptodate(bh)) {

			EXT4_ERROR_INODE_BLOCK(inode, block,