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authorEd Cashin <ecashin@coraid.com>2012-12-17 16:03:32 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 17:15:23 -0800
commitaa304fdefa568d63c862df7abe55d39811845c7c (patch)
treed96b9161f58e913baae3031b6512a534b036d98b
parent4ba9aa7f9819bafb304f09dee90bb1fa40627358 (diff)
aoe: support larger I/O requests via aoe_maxsectors module param
The GPFS filesystem is an example of an aoe user that requires the aoe driver to support I/O request sizes larger than the default. Most users will not need large I/O request sizes, because they would need to be split up into multiple AoE commands anyway. Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/block/aoe/aoeblk.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 00dfc5008ad4..d5aa3b8c9f33 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -16,11 +16,18 @@
#include <linux/netdevice.h>
#include <linux/mutex.h>
#include <linux/export.h>
+#include <linux/moduleparam.h>
#include "aoe.h"
static DEFINE_MUTEX(aoeblk_mutex);
static struct kmem_cache *buf_pool_cache;
+/* GPFS needs a larger value than the default. */
+static int aoe_maxsectors;
+module_param(aoe_maxsectors, int, 0644);
+MODULE_PARM_DESC(aoe_maxsectors,
+ "When nonzero, set the maximum number of sectors per I/O request");
+
static ssize_t aoedisk_show_state(struct device *dev,
struct device_attribute *attr, char *page)
{
@@ -248,6 +255,8 @@ aoeblk_gdalloc(void *vp)
d->blkq = gd->queue = q;
q->queuedata = d;
d->gd = gd;
+ if (aoe_maxsectors)
+ blk_queue_max_hw_sectors(q, aoe_maxsectors);
gd->major = AOE_MAJOR;
gd->first_minor = d->sysminor;
gd->fops = &aoe_bdops;