main - allocation: report allocation error instead of crash

[Zdenek Kabelac <zkabelac@sourceware.org>]

Gitweb:        https://sourceware.org/git/?p=lvm2.git;a=commitdiff;h=be0bf43d742a127435962d7075608519f18d4cdc
Commit:        be0bf43d742a127435962d7075608519f18d4cdc
Parent:        45f0c48365457b2ca4cec163f4435327f0978bd3
Author:        Zdenek Kabelac <zkabelac@redhat.com>
AuthorDate:    Mon Feb 1 10:24:19 2021 +0100
Committer:     Zdenek Kabelac <zkabelac@redhat.com>
CommitterDate: Mon Feb 1 12:13:49 2021 +0100

allocation: report allocation error instead of crash

Current allocation limitation requires to fit metadata/log LV on
a single PV. This is usually not a big problem, but since
thin-pool and cache-pool is using this for allocating extents
for their metadata LVs it might be eventually causing errors
where the remaining free spaces for large metadata size is spread
over several PV.
---
 lib/metadata/lv_manip.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/metadata/lv_manip.c b/lib/metadata/lv_manip.c
index 093cea464..c82038269 100644
--- a/lib/metadata/lv_manip.c
+++ b/lib/metadata/lv_manip.c
@@ -2109,15 +2109,18 @@ static int _alloc_parallel_area(struct alloc_handle *ah, uint32_t max_to_allocat
 			aa[smeta].pv = pva->map->pv;
 			aa[smeta].pe = pva->start;
 			aa[smeta].len = ah->log_len;
-
+			if (aa[smeta].len > pva->count) {
+				log_error("Metadata does not fit on a single PV.");
+				return 0;
+			}
 			log_debug_alloc("Allocating parallel metadata area %" PRIu32
 					" on %s start PE %" PRIu32
 					" length %" PRIu32 ".",
 					(smeta - (ah->area_count + ah->parity_count)),
 					pv_dev_name(aa[smeta].pv), aa[smeta].pe,
-					ah->log_len);
+					aa[smeta].len);
 
-			consume_pv_area(pva, ah->log_len);
+			consume_pv_area(pva, aa[smeta].len);
 			dm_list_add(&ah->alloced_areas[smeta], &aa[smeta].list);
 		}
 		aa[s].len = (ah->alloc_and_split_meta && !ah->split_metadata_is_allocated) ? len - ah->log_len : len;