File bug-1177734_raid-no-wiping-when-zeroing-raid-metadata-device.patch of Package lvm2.17787
From 9b9bf8786fb423a4430cc676301edadf2310098d Mon Sep 17 00:00:00 2001
From: Zdenek Kabelac <zkabelac@redhat.com>
Date: Wed, 8 Jul 2020 10:59:51 +0200
Subject: [PATCH] raid: no wiping when zeroing raid metadata device
Currently lvm2 is not wiping signatures when creating 'metadata' volumes
and raid _rmeta was the only exception - so make the behavior consistent
with other metadata devices and drop wiping ATM.
Drop also some extra debug since they are now more explanatory in
wipe_lv() function.
Also note - although lvm2 now does not wipe signatures - the error
from such wipping used to be actually 'ignored' before wipe_lv()
started to return error (with recent commit) and raid creation
continued with 'unzeroed' metadata device.
TODO: Several issues to resolve:
1. We may want to flip to wipping with all LVs (in that case we need to
support passing --yet & --force).
2. Also we may want to clear whole metadata device - however current
function is also used for wipping i.e. snapshot COW device which
is likely not a good candidate for full device zeroing.
We may also need to think about better logic when extent size is
enforcing very large LVs, when only a small portion of LV is ever
being used.
3. Using TRIM instead of zeroing metadata device might be worth to
implement.
mm
---
lib/metadata/lv_manip.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/lib/metadata/lv_manip.c b/lib/metadata/lv_manip.c
index 5956d032c..f0ba3f0db 100644
--- a/lib/metadata/lv_manip.c
+++ b/lib/metadata/lv_manip.c
@@ -7731,12 +7731,10 @@ int activate_and_wipe_lvlist(struct dm_list *lv_list, int commit)
}
dm_list_iterate_items(lvl, lv_list) {
- log_verbose("Wiping metadata area %s.", display_lvname(lvl->lv));
/* Wipe any know signatures */
- if (!wipe_lv(lvl->lv, (struct wipe_params) { .do_wipe_signatures = 1, .do_zero = 1, .zero_sectors = 1 })) {
- log_error("Failed to wipe %s.", display_lvname(lvl->lv));
+ if (!wipe_lv(lvl->lv, (struct wipe_params) { .do_zero = 1 /* TODO: is_metadata = 1 */ })) {
r = 0;
- goto out;
+ goto_out;
}
}
out:
--
2.29.2