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[PATCH] md: allow chunk_size to be settable through sysfs

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... only before array is started of course.

Signed-off-by: Neil Brown <[email protected]>
Acked-by: Greg KH <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
NeilBrown 2006-01-06 00:20:47 -08:00 • committed by Linus Torvalds
commit 3b34380ae8
2 changed files with 34 additions and 0 deletions
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26
drivers/md/md.c
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@ -1794,6 +1794,31 @@ raid_disks_show(mddev_t *mddev, char *page)
static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks);
static ssize_t
chunk_size_show(mddev_t *mddev, char *page)
{
return sprintf(page, "%d\n", mddev->chunk_size);
}
static ssize_t
chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
{
/* can only set chunk_size if array is not yet active */
char *e;
unsigned long n = simple_strtoul(buf, &e, 10);
if (mddev->pers)
return -EBUSY;
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
mddev->chunk_size = n;
return len;
}
static struct md_sysfs_entry md_chunk_size =
__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
static ssize_t
action_show(mddev_t *mddev, char *page)
{
@ -1861,6 +1886,7 @@ md_mismatches = __ATTR_RO(mismatch_cnt);
static struct attribute *md_default_attrs[] = {
&md_level.attr,
&md_raid_disks.attr,
&md_chunk_size.attr,
NULL,
};