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[PATCH] md: allow md/raid_disks to be settable 

If array is active, try to reshape, else just set the value.

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>
This commit is contained in:
NeilBrown 2006-01-06 00:20:54 -08:00 committed by Linus Torvalds
parent 4dbcdc751c
commit da943b9912
2 changed files with 53 additions and 22 deletions
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3
Documentation/md.txt
View File

@ -165,6 +165,9 @@ All md devices contain:
in a fully functional array. If this is not yet known, the file
will be empty. If an array is being resized (not currently
possible) this will contain the larger of the old and new sizes.
Some raid level (RAID1) allow this value to be set while the
array is active. This will reconfigure the array. Otherwise
it can only be set while assembling an array.
chunk_size
This is the size if bytes for 'chunks' and is only relevant to

72
drivers/md/md.c
View File

@ -1843,7 +1843,27 @@ raid_disks_show(mddev_t *mddev, char *page)
return sprintf(page, "%d\n", mddev->raid_disks);
}
static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks);
static int update_raid_disks(mddev_t *mddev, int raid_disks);
static ssize_t
raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
{
/* can only set raid_disks if array is not yet active */
char *e;
int rv = 0;
unsigned long n = simple_strtoul(buf, &e, 10);
if (!*buf || (*e && *e != '\n'))
return -EINVAL;
if (mddev->pers)
rv = update_raid_disks(mddev, n);
else
mddev->raid_disks = n;
return rv ? rv : len;
}
static struct md_sysfs_entry md_raid_disks =
__ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
static ssize_t
chunk_size_show(mddev_t *mddev, char *page)
@ -3201,6 +3221,33 @@ static int update_size(mddev_t *mddev, unsigned long size)
return rv;
}
static int update_raid_disks(mddev_t *mddev, int raid_disks)
{
int rv;
/* change the number of raid disks */
if (mddev->pers->reshape == NULL)
return -EINVAL;
if (raid_disks <= 0 ||
raid_disks >= mddev->max_disks)
return -EINVAL;
if (mddev->sync_thread)
return -EBUSY;
rv = mddev->pers->reshape(mddev, raid_disks);
if (!rv) {
struct block_device *bdev;
bdev = bdget_disk(mddev->gendisk, 0);
if (bdev) {
down(&bdev->bd_inode->i_sem);
i_size_write(bdev->bd_inode, mddev->array_size << 10);
up(&bdev->bd_inode->i_sem);
bdput(bdev);
}
}
return rv;
}
/*
* update_array_info is used to change the configuration of an
* on-line array.
@ -3252,28 +3299,9 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
if (mddev->size != info->size)
rv = update_size(mddev, info->size);
if (mddev->raid_disks != info->raid_disks) {
/* change the number of raid disks */
if (mddev->pers->reshape == NULL)
return -EINVAL;
if (info->raid_disks <= 0 ||
info->raid_disks >= mddev->max_disks)
return -EINVAL;
if (mddev->sync_thread)
return -EBUSY;
rv = mddev->pers->reshape(mddev, info->raid_disks);
if (!rv) {
struct block_device *bdev;
if (mddev->raid_disks != info->raid_disks)
rv = update_raid_disks(mddev, info->raid_disks);
bdev = bdget_disk(mddev->gendisk, 0);
if (bdev) {
down(&bdev->bd_inode->i_sem);
i_size_write(bdev->bd_inode, mddev->array_size << 10);
up(&bdev->bd_inode->i_sem);
bdput(bdev);
}
}
}
if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
if (mddev->pers->quiesce == NULL)
return -EINVAL;