[PATCH 1/2] fs/block-dev.c:fix performance regression in O_DIRECT writes to md block devices.
From: majianpeng <hidden>
Date: 2012-07-16 01:29:50
Also in:
linux-fsdevel
Subsystem:
filesystems (vfs and infrastructure), the rest · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds
For regular file, write operaion used blk_plug function.But for block file,write operation did not use blk_plug. Signed-off-by: Jianpeng Ma <redacted> --- fs/block_dev.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index c2bbe1f..22cd436 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c@@ -215,9 +215,14 @@ blkdev_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, { struct file *file = iocb->ki_filp; struct inode *inode = file->f_mapping->host; + struct blk_plug plug; + ssize_t ret; - return __blockdev_direct_IO(rw, iocb, inode, I_BDEV(inode), iov, offset, + blk_start_plug(&plug); + ret = __blockdev_direct_IO(rw, iocb, inode, I_BDEV(inode), iov, offset, nr_segs, blkdev_get_blocks, NULL, NULL, 0); + blk_finish_plug(&plug); + return ret; } int __sync_blockdev(struct block_device *bdev, int wait)
--
1.7.5.4