From b03755ad6f33b7b8cd7312a3596a2dbf496de6e7 Mon Sep 17 00:00:00 2001 From: zhangjs Date: Wed, 19 Jun 2019 23:41:29 -0400 Subject: 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: zhangjs Signed-off-by: Theodore Ts'o Reviewed-by: Jan Kara --- fs/ext4/inode.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/ext4/inode.c') diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index ed1d8f9ce5f9..11d7c2e403e9 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -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 @@ make_io: * 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 @@ make_io: 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, -- cgit v1.2.3