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-   -   dm-snap-possible-code-optimization.patch (http://www.linux-archive.org/device-mapper-development/249590-dm-snap-possible-code-optimization-patch.html)

Jonathan Brassow 02-20-2009 10:28 PM

dm-snap-possible-code-optimization.patch
 
Minor code clean-up. The reason I broke this out into a separate
patch is so people can check if I'm not missing anything... I
don't see a reason to check 's->valid' separately anymore.

RFC-by: Jonathan Brassow <jbrassow@redhat.com>

Index: linux-2.6/drivers/md/dm-snap.c
================================================== =================
--- linux-2.6.orig/drivers/md/dm-snap.c
+++ linux-2.6/drivers/md/dm-snap.c
@@ -740,20 +740,14 @@ static void pending_complete(struct dm_s
struct bio *snapshot_bios = NULL;
int error = 0;

+ down_write(&s->lock);
if (!success) {
/* Read/write error - snapshot is unusable */
- down_write(&s->lock);
__invalidate_snapshot(s, -EIO);
error = 1;
goto out;
}

- down_write(&s->lock);
- if (!s->valid) {
- error = 1;
- goto out;
- }
-
/*
* Check for conflicting reads. This is extremely improbable,
* so msleep(1) is sufficient and there is no need for a wait queue.


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https://www.redhat.com/mailman/listinfo/dm-devel

Jonathan Brassow 03-17-2009 01:05 PM

dm-snap-possible-code-optimization.patch
 
Minor code clean-up. The reason I broke this out into a separate
patch is so people can check if I'm not missing anything... I
don't see a reason to check 's->valid' separately anymore.

RFC-by: Jonathan Brassow <jbrassow@redhat.com>

Index: linux-2.6/drivers/md/dm-snap.c
================================================== =================
--- linux-2.6.orig/drivers/md/dm-snap.c
+++ linux-2.6/drivers/md/dm-snap.c
@@ -741,20 +741,14 @@ static void pending_complete(struct dm_s
struct bio *snapshot_bios = NULL;
int error = 0;

+ down_write(&s->lock);
if (!success) {
/* Read/write error - snapshot is unusable */
- down_write(&s->lock);
__invalidate_snapshot(s, -EIO);
error = 1;
goto out;
}

- down_write(&s->lock);
- if (!s->valid) {
- error = 1;
- goto out;
- }
-
/*
* Check for conflicting reads. This is extremely improbable,
* so msleep(1) is sufficient and there is no need for a wait queue.

--
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