diff options
| author |   NeilBrown <neilb@suse.de> | 2010-06-01 19:37:28 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2010-07-26 12:52:27 +1000 |
| commit | 4a5add49951e698073011855d1a8a7306bc9308d (patch) | |
| tree | 91c098468b96b959f88e1e2a386c6e8911db7c09 /drivers/md | |
| parent | md: add support for raising dm events. (diff) | |
| download | linux-dev-4a5add49951e698073011855d1a8a7306bc9308d.tar.xz linux-dev-4a5add49951e698073011855d1a8a7306bc9308d.zip | |
raid5: Don't set read-ahead when there is no queue
dm-raid456 does not provide a 'queue' for raid5 to use,
so we must make raid5 stop depending on the queue.
First: read_ahead
dm handles read-ahead adjustment fully in userspace, so
simply don't do any readahead adjustments if there is
no queue.
Also re-arrange code slightly so all the accesses to ->queue are
together.
Finally, move the blk_queue_merge_bvec function into the 'if' as
the ->split_io setting in dm-raid456 has the same effect.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 6fa60e416a09..9c462f6659c3 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5161,16 +5161,6 @@ static int run(mddev_t *mddev) "reshape"); } - /* read-ahead size must cover two whole stripes, which is - * 2 * (datadisks) * chunksize where 'n' is the number of raid devices - */ - { - int data_disks = conf->previous_raid_disks - conf->max_degraded; - int stripe = data_disks * - ((mddev->chunk_sectors << 9) / PAGE_SIZE); - if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) - mddev->queue->backing_dev_info.ra_pages = 2 * stripe; - } /* Ok, everything is just fine now */ if (mddev->to_remove == &raid5_attrs_group) @@ -5178,8 +5168,23 @@ static int run(mddev_t *mddev) else if (mddev->kobj.sd && sysfs_create_group(&mddev->kobj, &raid5_attrs_group)) printk(KERN_WARNING - "md/raid:%s: failed to create sysfs attributes.\n", + "raid5: failed to create sysfs attributes for %s\n", mdname(mddev)); + md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); + + if (mddev->queue) { + /* read-ahead size must cover two whole stripes, which + * is 2 * (datadisks) * chunksize where 'n' is the + * number of raid devices + */ + int data_disks = conf->previous_raid_disks - conf->max_degraded; + int stripe = data_disks * + ((mddev->chunk_sectors << 9) / PAGE_SIZE); + if (mddev->queue->backing_dev_info.ra_pages < 2 * stripe) + mddev->queue->backing_dev_info.ra_pages = 2 * stripe; + + blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); + } mddev->queue->queue_lock = &conf->device_lock; @@ -5187,9 +5192,6 @@ static int run(mddev_t *mddev) mddev->queue->backing_dev_info.congested_data = mddev; mddev->queue->backing_dev_info.congested_fn = raid5_congested; - md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); - - blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec); chunk_size = mddev->chunk_sectors << 9; blk_queue_io_min(mddev->queue, chunk_size); blk_queue_io_opt(mddev->queue, chunk_size * @@ -5618,7 +5620,7 @@ static void end_reshape(raid5_conf_t *conf) /* read-ahead size must cover two whole stripes, which is * 2 * (datadisks) * chunksize where 'n' is the number of raid devices */ - { + if (conf->mddev->queue) { int data_disks = conf->raid_disks - conf->max_degraded; int stripe = data_disks * ((conf->chunk_sectors << 9) / PAGE_SIZE); |