3.2.73-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: NeilBrown <neilb@xxxxxxxx>
commit 199dc6ed5179251fa6158a461499c24bdd99c836 upstream.
When a (e.g.) RAID5 array is reshaped to RAID0, the updating
of queue parameters (e.g. max number of sectors per bio) is
done in the wrong place.
It should be part of ->run, but it is actually part of ->takeover.
This means it happens before level_store() calls:
blk_set_stacking_limits(&mddev->queue->limits);
and so it ineffective. This can lead to errors from underlying
devices.
So move all the relevant settings out of create_stripe_zones()
and into raid0_run().
As this can lead to a bug-on it is suitable for any -stable
kernel which supports reshape to RAID0. So 2.6.35 or later.
As the bug has been present for five years there is no urgency,
so no need to rush into -stable.
Fixes: 9af204cf720c ("md: Add support for Raid5->Raid0 and Raid10->Raid0 takeover")
Reported-by: Yi Zhang <yizhan@xxxxxxxxxx>
Signed-off-by: NeilBrown <neilb@xxxxxxxx>
[bwh: Backported to 3.2:
- md has no discard or write-same support
- md is not used by dm-raid so mddev->queue is never null
- Open-code rdev_for_each()
- Adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -88,6 +88,7 @@ static int create_strip_zones(struct mdd
char b[BDEVNAME_SIZE];
char b2[BDEVNAME_SIZE];
struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
+ unsigned short blksize = 512;
if (!conf)
return -ENOMEM;
@@ -102,6 +103,9 @@ static int create_strip_zones(struct mdd
sector_div(sectors, mddev->chunk_sectors);
rdev1->sectors = sectors * mddev->chunk_sectors;
+ blksize = max(blksize, queue_logical_block_size(
+ rdev1->bdev->bd_disk->queue));
+
list_for_each_entry(rdev2, &mddev->disks, same_set) {
pr_debug("md/raid0:%s: comparing %s(%llu)"
" with %s(%llu)\n",
@@ -138,6 +142,18 @@ static int create_strip_zones(struct mdd
}
pr_debug("md/raid0:%s: FINAL %d zones\n",
mdname(mddev), conf->nr_strip_zones);
+ /*
+ * now since we have the hard sector sizes, we can make sure
+ * chunk size is a multiple of that sector size
+ */
+ if ((mddev->chunk_sectors << 9) % blksize) {
+ printk(KERN_ERR "md/raid0:%s: chunk_size of %d not multiple of block size %d\n",
+ mdname(mddev),
+ mddev->chunk_sectors << 9, blksize);
+ err = -EINVAL;
+ goto abort;
+ }
+
err = -ENOMEM;
conf->strip_zone = kzalloc(sizeof(struct strip_zone)*
conf->nr_strip_zones, GFP_KERNEL);
@@ -186,8 +202,6 @@ static int create_strip_zones(struct mdd
}
dev[j] = rdev1;
- disk_stack_limits(mddev->gendisk, rdev1->bdev,
- rdev1->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must never risk
* violating it, so limit ->max_segments to 1, lying within
* a single page.
@@ -263,21 +277,6 @@ static int create_strip_zones(struct mdd
mddev->queue->backing_dev_info.congested_fn = raid0_congested;
mddev->queue->backing_dev_info.congested_data = mddev;
- /*
- * now since we have the hard sector sizes, we can make sure
- * chunk size is a multiple of that sector size
- */
- if ((mddev->chunk_sectors << 9) % queue_logical_block_size(mddev->queue)) {
- printk(KERN_ERR "md/raid0:%s: chunk_size of %d not valid\n",
- mdname(mddev),
- mddev->chunk_sectors << 9);
- goto abort;
- }
-
- blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
- blk_queue_io_opt(mddev->queue,
- (mddev->chunk_sectors << 9) * mddev->raid_disks);
-
pr_debug("md/raid0:%s: done.\n", mdname(mddev));
*private_conf = conf;
@@ -340,6 +339,7 @@ static int raid0_run(struct mddev *mddev
{
struct r0conf *conf;
int ret;
+ struct md_rdev *rdev;
if (mddev->chunk_sectors == 0) {
printk(KERN_ERR "md/raid0:%s: chunk size must be set.\n",
@@ -348,7 +348,6 @@ static int raid0_run(struct mddev *mddev
}
if (md_check_no_bitmap(mddev))
return -EINVAL;
- blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
/* if private is not null, we are here after takeover */
if (mddev->private == NULL) {
@@ -359,6 +358,16 @@ static int raid0_run(struct mddev *mddev
}
conf = mddev->private;
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
+ disk_stack_limits(mddev->gendisk, rdev->bdev,
+ rdev->data_offset << 9);
+ }
+ blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
+
+ blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9);
+ blk_queue_io_opt(mddev->queue,
+ (mddev->chunk_sectors << 9) * mddev->raid_disks);
+
/* calculate array device size */
md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));
--
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