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snapshot: improve checking of merging snapshot

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Add runtime detection for 'lvs -o+seg_monitor' and 'vgchange --monitor'.
This fix should avoid unnecessary timeout on systemd shutdown.
This commit is contained in:
Zdenek Kabelac 2018-06-11 22:19:20 +02:00
parent 75fed05d3e
commit 77d5caae90
3 changed files with 5 additions and 2 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 3.0.0
=============
Fix unmonitoring of merging snapshots.
Cache can uses metadata format 2 with cleaner policy.
Fix check if resized PV can also fit metadata area.
Avoid showing internal error in lvs output or pvmoved LVs.

3
lib/activate/activate.c
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@ -1735,7 +1735,8 @@ int monitor_dev_for_events(struct cmd_context *cmd, const struct logical_volume
* In case of a snapshot device, we monitor lv->snapshot->lv,
* not the actual LV itself.
*/
if (lv_is_cow(lv) && (laopts->no_merging || !lv_is_merging_cow(lv))) {
if (lv_is_cow(lv) && (laopts->no_merging || !lv_is_merging_cow(lv) ||
lv_has_target_type(lv->vg->cmd->mem, lv, NULL, TARGET_NAME_SNAPSHOT))) {
if (!(r = monitor_dev_for_events(cmd, lv->snapshot->lv, NULL, monitor)))
stack;
return r;

3
lib/metadata/lv.c
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@ -301,7 +301,8 @@ char *lvseg_monitor_dup(struct dm_pool *mem, const struct lv_segment *seg)
int pending = 0, monitored = 0;
struct lv_segment *segm = (struct lv_segment *) seg;
if (lv_is_cow(seg->lv) && !lv_is_merging_cow(seg->lv))
if (lv_is_cow(seg->lv) && (!lv_is_merging_cow(seg->lv) ||
lv_has_target_type(seg->lv->vg->cmd->mem, seg->lv, NULL, TARGET_NAME_SNAPSHOT)))
segm = first_seg(seg->lv->snapshot->lv);
// log_debug("Query LV:%s mon:%s segm:%s tgtm:%p segmon:%d statusm:%d", seg->lv->name, segm->lv->name, segm->segtype->name, segm->segtype->ops->target_monitored, seg_monitored(segm), (int)(segm->status & PVMOVE));