Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c303da6d713b87b7b3f999f5acce8ecc76ff1adb
Commit: c303da6d713b87b7b3f999f5acce8ecc76ff1adb
Parent: e691063a61f7f72a7d2882eb744b07a520cde23b
Author: NeilBrown <[EMAIL PROTECTED]>
AuthorDate: Wed Feb 6 01:39:51 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Wed Feb 6 10:41:18 2008 -0800
md: give userspace control over removing failed devices when external
metdata in use
When a device fails, we must not allow an further writes to the array until
the device failure has been recorded in array metadata. When metadata is
managed externally, this requires some synchronisation...
Allow/require userspace to explicitly remove failed devices from active
service in the array by writing 'none' to the 'slot' attribute. If this
reduces the number of failed devices to 0, the write block will
automatically
be lowered.
Signed-off-by: Neil Brown <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
drivers/md/md.c | 43 ++++++++++++++++++++++++++++++++++---------
1 files changed, 34 insertions(+), 9 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index e2782a0..00788c5 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1891,20 +1891,44 @@ static ssize_t
slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
{
char *e;
+ int err;
+ char nm[20];
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);
+ if (rdev->mddev->pers) {
+ /* Setting 'slot' on an active array requires also
+ * updating the 'rd%d' link, and communicating
+ * with the personality with ->hot_*_disk.
+ * For now we only support removing
+ * failed/spare devices. This normally happens automatically,
+ * but not when the metadata is externally managed.
+ */
+ if (slot != -1)
+ return -EBUSY;
+ if (rdev->raid_disk == -1)
+ return -EEXIST;
+ /* personality does all needed checks */
+ if (rdev->mddev->pers->hot_add_disk == NULL)
+ return -EINVAL;
+ err = rdev->mddev->pers->
+ hot_remove_disk(rdev->mddev, rdev->raid_disk);
+ if (err)
+ return err;
+ sprintf(nm, "rd%d", rdev->raid_disk);
+ sysfs_remove_link(&rdev->mddev->kobj, nm);
+ set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
+ md_wakeup_thread(rdev->mddev->thread);
+ } else {
+ 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;
}
@@ -5549,6 +5573,7 @@ static int remove_and_add_spares(mddev_t *mddev)
ITERATE_RDEV(mddev,rdev,rtmp)
if (rdev->raid_disk >= 0 &&
+ !mddev->external &&
(test_bit(Faulty, &rdev->flags) ||
! test_bit(In_sync, &rdev->flags)) &&
atomic_read(&rdev->nr_pending)==0) {
-
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