From 3b34380ae8c5df6debd85183c7fa1ac05f79b7d2 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Fri, 6 Jan 2006 00:20:47 -0800 Subject: [PATCH] md: allow chunk_size to be settable through sysfs ... only before array is started of course. Signed-off-by: Neil Brown Acked-by: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/md/md.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'drivers/md/md.c') diff --git a/drivers/md/md.c b/drivers/md/md.c index 0b3081aa4d6..9e57e97bd53 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -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, }; -- cgit v1.2.3