lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

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;