[PATCH] md: expose device slot information via sysfs
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>
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@ -236,6 +236,14 @@ Each directory contains:
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providing an ongoing count for arrays with metadata managed by
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userspace.
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slot
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This gives the role that the device has in the array. It will
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either be 'none' if the device is not active in the array
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(i.e. is a spare or has failed) or an integer less than the
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'raid_disks' number for the array indicating which possition
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it currently fills. This can only be set while assembling an
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array. A device for which this is set is assumed to be working.
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An active md device will also contain and entry for each active device
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in the array. These are named
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@ -1630,10 +1630,45 @@ errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
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static struct rdev_sysfs_entry rdev_errors =
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__ATTR(errors, 0644, errors_show, errors_store);
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static ssize_t
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slot_show(mdk_rdev_t *rdev, char *page)
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{
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if (rdev->raid_disk < 0)
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return sprintf(page, "none\n");
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else
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return sprintf(page, "%d\n", rdev->raid_disk);
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}
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static ssize_t
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slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
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{
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char *e;
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int slot = simple_strtoul(buf, &e, 10);
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if (strncmp(buf, "none", 4)==0)
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slot = -1;
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else if (e==buf || (*e && *e!= '\n'))
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return -EINVAL;
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if (rdev->mddev->pers)
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/* Cannot set slot in active array (yet) */
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return -EBUSY;
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if (slot >= rdev->mddev->raid_disks)
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return -ENOSPC;
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rdev->raid_disk = slot;
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/* assume it is working */
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rdev->flags = 0;
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set_bit(In_sync, &rdev->flags);
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return len;
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}
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static struct rdev_sysfs_entry rdev_slot =
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__ATTR(slot, 0644, slot_show, slot_store);
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static struct attribute *rdev_default_attrs[] = {
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&rdev_state.attr,
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&rdev_super.attr,
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&rdev_errors.attr,
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&rdev_slot.attr,
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NULL,
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};
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static ssize_t
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