The patch titled
md: give userspace control over removing failed devices when external metdata in use
has been added to the -mm tree. Its filename is
md-give-userspace-control-over-removing-failed-devices-when-external-metdata-in-use.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: md: give userspace control over removing failed devices when external metdata in use
From: NeilBrown <neilb@xxxxxxx>
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 <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/md/md.c | 43 ++++++++++++++++++++++++++++++++++---------
1 file changed, 34 insertions(+), 9 deletions(-)
diff -puN drivers/md/md.c~md-give-userspace-control-over-removing-failed-devices-when-external-metdata-in-use drivers/md/md.c
--- a/drivers/md/md.c~md-give-userspace-control-over-removing-failed-devices-when-external-metdata-in-use
+++ a/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
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) {
_
Patches currently in -mm which might be from neilb@xxxxxxx are
origin.patch
git-nfsd.patch
coding-style-cleanups-for-drivers-md-mktablesc.patch
md-raid6-fix-mktablec.patch
md-raid6-clean-up-the-style-of-raid6test-testc.patch
md-update-md-bitmap-during-resync.patch
md-update-md-bitmap-during-resync-fix.patch
md-support-external-metadata-for-md-arrays.patch
md-give-userspace-control-over-removing-failed-devices-when-external-metdata-in-use.patch
md-allow-a-maximum-extent-to-be-set-for-resyncing.patch
md-allow-devices-to-be-shared-between-md-arrays.patch
md-lock-address-when-changing-attributes-of-component-devices.patch
md-allow-an-md-array-to-appear-with-0-drives-if-it-has-external-metadata.patch
md-get-name-for-block-device-in-sysfs.patch
one-less-parameter-to-__d_path.patch
d_path-kerneldoc-cleanup.patch
d_path-use-struct-path-in-struct-avc_audit_data.patch
d_path-make-proc_get_link-use-a-struct-path-argument.patch
d_path-make-get_dcookie-use-a-struct-path-argument.patch
use-struct-path-in-struct-svc_export.patch
use-struct-path-in-struct-svc_export-checkpatch-fixes.patch
use-struct-path-in-struct-svc_expkey.patch
d_path-make-seq_path-use-a-struct-path-argument.patch
d_path-make-d_path-use-a-struct-path.patch
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