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authorNeilBrown <neilb@suse.de>2006-01-06 00:20:47 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:34:08 -0800
commit3b34380ae8c5df6debd85183c7fa1ac05f79b7d2 (patch)
tree9979f8b402b0566db286081eb7f5c26418964348 /drivers/md
parent03c902e17f40cfed63cd2494616f35fc9c58571b (diff)
[PATCH] md: allow chunk_size to be settable through sysfs
... only before array is started of course. Signed-off-by: Neil Brown <neilb@suse.de> Acked-by: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/md.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0b3081aa4d63..9e57e97bd530 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1795,6 +1795,31 @@ 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)
{
char *type = "idle";
@@ -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,
};