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[PATCH] md: expose md metadata format in sysfs

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Allow it to be set to a particular version, or 'none'.

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 00:20:50 -08:00
committed by Linus Torvalds
parent a35b0d695d
commit 8bb93aaca2
2 changed files with 55 additions and 0 deletions
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49
drivers/md/md.c
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@@ -1857,6 +1857,54 @@ size_store(mddev_t *mddev, const char *buf, size_t len)
static struct md_sysfs_entry md_size =
__ATTR(component_size, 0644, size_show, size_store);
/* Metdata version.
* This is either 'none' for arrays with externally managed metadata,
* or N.M for internally known formats
*/
static ssize_t
metadata_show(mddev_t *mddev, char *page)
{
if (mddev->persistent)
return sprintf(page, "%d.%d\n",
mddev->major_version, mddev->minor_version);
else
return sprintf(page, "none\n");
}
static ssize_t
metadata_store(mddev_t *mddev, const char *buf, size_t len)
{
int major, minor;
char *e;
if (!list_empty(&mddev->disks))
return -EBUSY;
if (cmd_match(buf, "none")) {
mddev->persistent = 0;
mddev->major_version = 0;
mddev->minor_version = 90;
return len;
}
major = simple_strtoul(buf, &e, 10);
if (e==buf || *e != '.')
return -EINVAL;
buf = e+1;
minor = simple_strtoul(buf, &e, 10);
if (e==buf || *e != '\n')
return -EINVAL;
if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
super_types[major].name == NULL)
return -ENOENT;
mddev->major_version = major;
mddev->minor_version = minor;
mddev->persistent = 1;
return len;
}
static struct md_sysfs_entry md_metadata =
__ATTR(metadata_version, 0644, metadata_show, metadata_store);
static ssize_t
action_show(mddev_t *mddev, char *page)
{
@@ -1926,6 +1974,7 @@ static struct attribute *md_default_attrs[] = {
&md_raid_disks.attr,
&md_chunk_size.attr,
&md_size.attr,
&md_metadata.attr,
NULL,
};