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Commit c41d4ac4 authored by NeilBrown's avatar NeilBrown
Browse files

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



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

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 00bcb4ac

drivers/md/raid5.c

+26 −13
Original line number Diff line number Diff line
@@ -4566,23 +4566,15 @@ raid5_show_stripe_cache_size(mddev_t *mddev, char *page) 
		return 0;

}



static ssize_t

raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len)

int

raid5_set_cache_size(mddev_t *mddev, int size)

{

	raid5_conf_t *conf = mddev->private;

	unsigned long new;

	int err;



	if (len >= PAGE_SIZE)

	if (size <= 16 || size > 32768)

		return -EINVAL;

	if (!conf)

		return -ENODEV;



	if (strict_strtoul(page, 10, &new))

		return -EINVAL;

	if (new <= 16 || new > 32768)

		return -EINVAL;

	while (new < conf->max_nr_stripes) {

	while (size < conf->max_nr_stripes) {

		if (drop_one_stripe(conf))

			conf->max_nr_stripes--;

		else
@@ -4591,11 +4583,32 @@ raid5_store_stripe_cache_size(mddev_t *mddev, const char *page, size_t len) 
	err = md_allow_write(mddev);

	if (err)

		return err;

	while (new > conf->max_nr_stripes) {

	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)

{

	raid5_conf_t *conf = mddev->private;

	unsigned long new;

	int err;



	if (len >= PAGE_SIZE)

		return -EINVAL;

	if (!conf)

		return -ENODEV;



	if (strict_strtoul(page, 10, &new))

		return -EINVAL;

	err = raid5_set_cache_size(mddev, new);

	if (err)

		return err;

	return len;

}

drivers/md/raid5.h

+1 −0
Original line number Diff line number Diff line
@@ -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