[lvm-devel] master - metadata: Explain the pvs_outdated field in struct volume_group.
Alasdair Kergon
agk at fedoraproject.org
Fri Jun 12 15:10:16 UTC 2015
Gitweb: http://git.fedorahosted.org/git/?p=lvm2.git;a=commitdiff;h=756d027da5cd0e10b10181515a75ecf8d275a5b3
Commit: 756d027da5cd0e10b10181515a75ecf8d275a5b3
Parent: fd29c7f3a171174dcd47eb8b23ff42a145cdacc6
Author: Petr Rockai <prockai at redhat.com>
AuthorDate: Wed Jun 10 16:17:45 2015 +0200
Committer: Petr Rockai <prockai at redhat.com>
CommitterDate: Wed Jun 10 16:17:45 2015 +0200
metadata: Explain the pvs_outdated field in struct volume_group.
---
lib/metadata/vg.h | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/lib/metadata/vg.h b/lib/metadata/vg.h
index bb21f34..2da5651 100644
--- a/lib/metadata/vg.h
+++ b/lib/metadata/vg.h
@@ -92,7 +92,18 @@ struct volume_group {
/*
* List of physical volumes that carry outdated metadata that belongs
- * to this VG. Currently only populated when lvmetad is in use.
+ * to this VG. Currently only populated when lvmetad is in use. The PVs
+ * on this list could still belong to the VG (but their MDA carries an
+ * out-of-date copy of the VG metadata) or they could no longer belong
+ * to the VG. With lvmetad, this list is populated with all PVs that
+ * have a VGID matching ours, but seqno that is smaller than the
+ * current seqno for the VG. The MDAs on still-in-VG PVs are updated as
+ * part of the normal vg_write/vg_commit process. The MDAs on PVs that
+ * no longer belong to the VG are wiped during vg_read.
+ *
+ * However, even though still-in-VG PVs *may* be on the list, this is
+ * not guaranteed. The in-lvmetad list is cleared whenever out-of-VG
+ * outdated PVs are wiped during vg_read.
*/
struct dm_list pvs_outdated;
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