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md: register new md sysfs file 'uuid' read-only 

Report the UUID of the MD array in the following format:
xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

This is useful if you don't want to wait for udev to identify array.
And it is also easy for script to monitor it with the format.

Signed-off-by: Sebastian Parschauer <s.parschauer@gmx.de>
[Guoqing: mention the change in md.rst]
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Sebastian Parschauer 2020-07-28 12:01:39 +02:00 committed by Song Liu
parent d9c0fa509e
commit ec164d07aa
2 changed files with 13 additions and 0 deletions
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4
Documentation/admin-guide/md.rst
View File

@ -426,6 +426,10 @@ All md devices contain:
The accepted values when writing to this file are ``ppl`` and ``resync``,
used to enable and disable PPL.
uuid
This indicates the UUID of the array in the following format:
xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
As component devices are added to an md array, they appear in the ``md``
directory as new directories named::

9
drivers/md/md.c
View File

@ -4252,6 +4252,14 @@ raid_disks_store(struct mddev *mddev, const char *buf, size_t len)
static struct md_sysfs_entry md_raid_disks =
__ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
static ssize_t
uuid_show(struct mddev *mddev, char *page)
{
return sprintf(page, "%pU\n", mddev->uuid);
}
static struct md_sysfs_entry md_uuid =
__ATTR(uuid, S_IRUGO, uuid_show, NULL);
static ssize_t
chunk_size_show(struct mddev *mddev, char *page)
{
@ -5508,6 +5516,7 @@ static struct attribute *md_default_attrs[] = {
&md_level.attr,
&md_layout.attr,
&md_raid_disks.attr,
&md_uuid.attr,
&md_chunk_size.attr,
&md_size.attr,
&md_resync_start.attr,