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metadata: Explain the pvs_outdated field in struct volume_group.

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This commit is contained in:
Petr Rockai 2015-06-10 16:17:45 +02:00
parent fd29c7f3a1
commit 756d027da5
1 changed files with 12 additions and 1 deletions
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13
lib/metadata/vg.h
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@ -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* List of physical volumes that carry outdated metadata that belongs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* out-of-date copy of the VG metadata) or they could no longer belong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* outdated PVs are wiped during vg_read.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;