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md/raid5: factor out code for changing size of stripe cache.

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Separate the actual 'change' code from the sysfs interface
so that it can eventually be called internally.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2010-06-01 19:37:24 +10:00
parent 00bcb4ac7e
commit c41d4ac40d
2 changed files with 28 additions and 14 deletions
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41
drivers/md/raid5.c
View File

@ -4566,6 +4566,32 @@ raid5_show_stripe_cache_size(mddev_t *mddev, char *page)
return 0;
}
int
raid5_set_cache_size(mddev_t *mddev, int size)
{
raid5_conf_t *conf = mddev->private;
int err;
if (size <= 16 || size > 32768)
return -EINVAL;
while (size < conf->max_nr_stripes) {
if (drop_one_stripe(conf))
conf->max_nr_stripes--;
else
break;
}
err = md_allow_write(mddev);
if (err)
return err;
while (size > conf->max_nr_stripes) {
if (grow_one_stripe(conf))
conf->max_nr_stripes++;
else break;
}
return 0;
}
EXPORT_SYMBOL(raid5_set_cache_size);
static ssize_t
raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len)
{
@ -4580,22 +4606,9 @@ raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len)
if (strict_strtoul(page, 10, &new))
return -EINVAL;
if (new <= 16 || new > 32768)
return -EINVAL;
while (new < conf->max_nr_stripes) {
if (drop_one_stripe(conf))
conf->max_nr_stripes--;
else
break;
}
err = md_allow_write(mddev);
err = raid5_set_cache_size(mddev, new);
if (err)
return err;
while (new > conf->max_nr_stripes) {
if (grow_one_stripe(conf))
conf->max_nr_stripes++;
else break;
}
return len;
}

1
drivers/md/raid5.h
View File

@ -497,4 +497,5 @@ static inline int algorithm_is_DDF(int layout)
{
return layout >= 8 && layout <= 10;
}
extern int raid5_set_cache_size(mddev_t *mddev, int size);
#endif