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[PATCH] md: expose device slot information via sysfs

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This the role that a device has in an array can be viewed and set.

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 00:20:55 -08:00 committed by Linus Torvalds
parent 2bf071bf50
commit 014236d2b8
2 changed files with 43 additions and 0 deletions
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8
Documentation/md.txt
View file

@ -236,6 +236,14 @@ Each directory contains:
providing an ongoing count for arrays with metadata managed by
userspace.
slot
This gives the role that the device has in the array. It will
either be 'none' if the device is not active in the array
(i.e. is a spare or has failed) or an integer less than the
'raid_disks' number for the array indicating which possition
it currently fills. This can only be set while assembling an
array. A device for which this is set is assumed to be working.
An active md device will also contain and entry for each active device
in the array. These are named

35
drivers/md/md.c
View file

@ -1630,10 +1630,45 @@ errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
static struct rdev_sysfs_entry rdev_errors =
__ATTR(errors, 0644, errors_show, errors_store);
static ssize_t
slot_show(mdk_rdev_t *rdev, char *page)
{
if (rdev->raid_disk < 0)
return sprintf(page, "none\n");
else
return sprintf(page, "%d\n", rdev->raid_disk);
}
static ssize_t
slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
{
char *e;
int slot = simple_strtoul(buf, &e, 10);
if (strncmp(buf, "none", 4)==0)
slot = -1;
else if (e==buf || (*e && *e!= '\n'))
return -EINVAL;
if (rdev->mddev->pers)
/* Cannot set slot in active array (yet) */
return -EBUSY;
if (slot >= rdev->mddev->raid_disks)
return -ENOSPC;
rdev->raid_disk = slot;
/* assume it is working */
rdev->flags = 0;
set_bit(In_sync, &rdev->flags);
return len;
}
static struct rdev_sysfs_entry rdev_slot =
__ATTR(slot, 0644, slot_show, slot_store);
static struct attribute *rdev_default_attrs[] = {
&rdev_state.attr,
&rdev_super.attr,
&rdev_errors.attr,
&rdev_slot.attr,
NULL,
};
static ssize_t