Commit 7f63257d authored by Benjamin Marzinski's avatar Benjamin Marzinski Committed by Steven Whitehouse
Browse files

GFS2: Sort buffer lists by inplace block number 



This patch simply sort the data and metadata buffer lists by their
inplace block number.  This makes gfs2_log_flush issue the inplace IO
in sequential order, which will hopefully speed up writing the IO
out to disk.

Signed-off-by: default avatarBenjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 844ce9f2

fs/gfs2/lops.c

+16 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/gfs2_ondisk.h>

#include <linux/bio.h>

#include <linux/fs.h>

#include <linux/list_sort.h>



#include "gfs2.h"

#include "incore.h"
@@ -401,6 +402,20 @@ static void gfs2_check_magic(struct buffer_head *bh) 
	kunmap_atomic(kaddr);

}



static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)

{

	struct gfs2_bufdata *bda, *bdb;



	bda = list_entry(a, struct gfs2_bufdata, bd_list);

	bdb = list_entry(b, struct gfs2_bufdata, bd_list);



	if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)

		return -1;

	if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)

		return 1;

	return 0;

}



static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,

				unsigned int total, struct list_head *blist,

				bool is_databuf)
@@ -413,6 +428,7 @@ static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit, 
	__be64 *ptr;



	gfs2_log_lock(sdp);

	list_sort(NULL, blist, blocknr_cmp);

	bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);

	while(total) {

		num = total;

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