Btrfs: set plug for fsync (343e4fc1) · Commits · 戴 / test

Setting plug can merge adjacent IOs before dispatching IOs to the disk driver. Without plug, it'd not be a problem for single disk usecases, but for multiple disks using raid profile, a large IO can be split to several IOs of stripe length, and plug can be helpful to bring them together for each disk so that we can save several disk access. Moreover, fsync issues synchronous writes, so plug can really take effect. Signed-off-by:

Liu Bo <bo.li.liu@oracle.com> Reviewed-by:

David Sterba <dsterba@suse.com> Signed-off-by:

David Sterba <dsterba@suse.com>

fs/btrfs/file.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -2019,10 +2019,19 @@ int btrfs_release_file(struct inode inode, struct file filp)
		static int start_ordered_ops(struct inode *inode, loff_t start, loff_t end)
		{
		int ret;
		struct blk_plug plug;

		/*
		* This is only called in fsync, which would do synchronous writes, so
		* a plug can merge adjacent IOs as much as possible. Esp. in case of
		* multiple disks using raid profile, a large IO can be split to
		* several segments of stripe length (currently 64K).
		*/
		blk_start_plug(&plug);
		atomic_inc(&BTRFS_I(inode)->sync_writers);
		ret = btrfs_fdatawrite_range(inode, start, end);
		atomic_dec(&BTRFS_I(inode)->sync_writers);
		blk_finish_plug(&plug);

		return ret;
		}

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