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md: raid5: check stripe cache is large enough in start_reshape

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In reshape cases that do not change the number of devices,
start_reshape is called without first calling check_reshape.

Currently, the check that the stripe_cache is large enough is
only done in check_reshape.  It should be in start_reshape too.

Signed-off-by: NeilBrown <neilb@suse.de>
tirimbino
NeilBrown 16 years ago
parent d6e412eaa5
commit 01ee22b496
1 changed files with 27 additions and 17 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 44
      drivers/md/raid5.c

44
drivers/md/raid5.c
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@ -4845,6 +4845,29 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
return 0;
}
static int check_stripe_cache(mddev_t *mddev)
{
/* Can only proceed if there are plenty of stripe_heads.
* We need a minimum of one full stripe,, and for sensible progress
* it is best to have about 4 times that.
* If we require 4 times, then the default 256 4K stripe_heads will
* allow for chunk sizes up to 256K, which is probably OK.
* If the chunk size is greater, user-space should request more
* stripe_heads first.
*/
raid5_conf_t *conf = mddev->private;
if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4
> conf->max_nr_stripes ||
((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4
> conf->max_nr_stripes) {
printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n",
((max(mddev->chunk_sectors, mddev->new_chunk_sectors) << 9)
/ STRIPE_SIZE)*4);
return 0;
}
return 1;
}
static int raid5_check_reshape(mddev_t *mddev)
{
raid5_conf_t *conf = mddev->private;
@ -4871,24 +4894,8 @@ static int raid5_check_reshape(mddev_t *mddev)
return -EINVAL;
}
/* Can only proceed if there are plenty of stripe_heads.
* We need a minimum of one full stripe,, and for sensible progress
* it is best to have about 4 times that.
* If we require 4 times, then the default 256 4K stripe_heads will
* allow for chunk sizes up to 256K, which is probably OK.
* If the chunk size is greater, user-space should request more
* stripe_heads first.
*/
if (((mddev->chunk_sectors << 9) / STRIPE_SIZE) * 4
> conf->max_nr_stripes ||
((mddev->new_chunk_sectors << 9) / STRIPE_SIZE) * 4
> conf->max_nr_stripes) {
printk(KERN_WARNING "raid5: reshape: not enough stripes. Needed %lu\n",
(max(mddev->chunk_sectors << 9,
mddev->new_chunk_sectors << 9)
/ STRIPE_SIZE)*4);
if (!check_stripe_cache(mddev))
return -ENOSPC;
}
return resize_stripes(conf, conf->raid_disks + mddev->delta_disks);
}
@ -4904,6 +4911,9 @@ static int raid5_start_reshape(mddev_t *mddev)
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return -EBUSY;
if (!check_stripe_cache(mddev))
return -ENOSPC;
list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->raid_disk < 0 &&
!test_bit(Faulty, &rdev->flags))

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