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MD: raid1 changes to allow use by device mapper 

MD RAID1: Changes to allow RAID1 to be used by device-mapper (dm-raid.c)

Added the necessary congestion function and conditionalize calls requiring an
array 'queue' or 'gendisk'.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Jonathan Brassow 2011-06-07 17:50:35 -05:00 committed by NeilBrown
parent 0fd018af37
commit 1ed7242e59
2 changed files with 19 additions and 7 deletions
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24
drivers/md/raid1.c
View File

@ -497,21 +497,19 @@ static int read_balance(conf_t *conf, r1bio_t *r1_bio)
return best_disk;
}
static int raid1_congested(void *data, int bits)
int md_raid1_congested(mddev_t *mddev, int bits)
{
mddev_t *mddev = data;
conf_t *conf = mddev->private;
int i, ret = 0;
if (mddev_congested(mddev, bits))
return 1;
rcu_read_lock();
for (i = 0; i < mddev->raid_disks; i++) {
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !test_bit(Faulty, &rdev->flags)) {
struct request_queue *q = bdev_get_queue(rdev->bdev);
BUG_ON(!q);
/* Note the '|| 1' - when read_balance prefers
* non-congested targets, it can be removed
*/
@ -524,7 +522,15 @@ static int raid1_congested(void *data, int bits)
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL_GPL(md_raid1_congested);
static int raid1_congested(void *data, int bits)
{
mddev_t *mddev = data;
return mddev_congested(mddev, bits) ||
md_raid1_congested(mddev, bits);
}
static void flush_pending_writes(conf_t *conf)
{
@ -1972,6 +1978,8 @@ static int run(mddev_t *mddev)
return PTR_ERR(conf);
list_for_each_entry(rdev, &mddev->disks, same_set) {
if (!mddev->gendisk)
continue;
disk_stack_limits(mddev->gendisk, rdev->bdev,
rdev->data_offset << 9);
/* as we don't honour merge_bvec_fn, we must never risk
@ -2013,8 +2021,10 @@ static int run(mddev_t *mddev)
md_set_array_sectors(mddev, raid1_size(mddev, 0, 0));
mddev->queue->backing_dev_info.congested_fn = raid1_congested;
mddev->queue->backing_dev_info.congested_data = mddev;
if (mddev->queue) {
mddev->queue->backing_dev_info.congested_fn = raid1_congested;
mddev->queue->backing_dev_info.congested_data = mddev;
}
return md_integrity_register(mddev);
}

2
drivers/md/raid1.h
View File

@ -126,4 +126,6 @@ struct r1bio_s {
*/
#define R1BIO_Returned 6
extern int md_raid1_congested(mddev_t *mddev, int bits);
#endif