From: zhangjs <zachary@xxxxxxxxxxxxxxxx>
If the task is unplugged when called, the inode_readahead_blks may not be merged,
these will cause small pieces of io, It should be plugged.
Signed-off-by: zhangjs <zachary@xxxxxxxxxxxxxxxx>
---
fs/ext4/inode.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c7f77c6..8fe046b 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;
@@ -4654,6 +4655,8 @@ static int __ext4_get_inode_loc(struct inode *inode,
}
make_io:
+ blk_start_plug(&plug);
+
/*
* If we need to do any I/O, try to pre-readahead extra
* blocks from the inode table.
@@ -4688,6 +4691,9 @@ 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,
--
1.8.3.1
