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[PATCH] md: support adding new devices to md arrays via sysfs

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Writing major:minor to md/new_dev will bind that device to the array.

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 00:21:16 -08:00
committed by Linus Torvalds
parent 83303b613d
commit 6d7ff7380b
2 changed files with 68 additions and 0 deletions
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60
drivers/md/md.c
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@@ -1987,6 +1987,65 @@ chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
static struct md_sysfs_entry md_chunk_size =
__ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
static ssize_t
null_show(mddev_t *mddev, char *page)
{
return -EINVAL;
}
static ssize_t
new_dev_store(mddev_t *mddev, const char *buf, size_t len)
{
/* buf must be %d:%d\n? giving major and minor numbers */
/* The new device is added to the array.
* If the array has a persistent superblock, we read the
* superblock to initialise info and check validity.
* Otherwise, only checking done is that in bind_rdev_to_array,
* which mainly checks size.
*/
char *e;
int major = simple_strtoul(buf, &e, 10);
int minor;
dev_t dev;
mdk_rdev_t *rdev;
int err;
if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
return -EINVAL;
minor = simple_strtoul(e+1, &e, 10);
if (*e && *e != '\n')
return -EINVAL;
dev = MKDEV(major, minor);
if (major != MAJOR(dev) ||
minor != MINOR(dev))
return -EOVERFLOW;
if (mddev->persistent) {
rdev = md_import_device(dev, mddev->major_version,
mddev->minor_version);
if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
mdk_rdev_t, same_set);
err = super_types[mddev->major_version]
.load_super(rdev, rdev0, mddev->minor_version);
if (err < 0)
goto out;
}
} else
rdev = md_import_device(dev, -1, -1);
if (IS_ERR(rdev))
return PTR_ERR(rdev);
err = bind_rdev_to_array(rdev, mddev);
out:
if (err)
export_rdev(rdev);
return err ? err : len;
}
static struct md_sysfs_entry md_new_device =
__ATTR(new_dev, 0200, null_show, new_dev_store);
static ssize_t
size_show(mddev_t *mddev, char *page)
@@ -2144,6 +2203,7 @@ static struct attribute *md_default_attrs[] = {
&md_chunk_size.attr,
&md_size.attr,
&md_metadata.attr,
&md_new_device.attr,
NULL,
};