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lvmlockd: fix metadata validation when rescanning VG

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When rescanning a VG from disk, the metadata read from
each PV was compared as a sanity check.  The comparison
is done by exporting the vg metadata from each dev to
a config tree, and then comparing the config trees.
The function to create the config tree inserts
extraneous information along with the actual VG metadata.
This extra info includes creation_time.  The config
trees for two devs can easily be created one second
apart in which case the different creation_times would
cause the metadata comparison to fail.  The fix is to
exclude the extraneous info from the metadata comparison.
This commit is contained in:
David Teigland 2016-09-13 16:50:47 -05:00
parent 629059ee84
commit d455300d7b
1 changed files with 30 additions and 1 deletions
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31
lib/cache/lvmetad.c vendored
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@ -1918,15 +1918,44 @@ scan_more:
vgmeta_ret = vgmeta;
save_dev = devl->dev;
} else {
if (compare_config(vgmeta_ret->root, vgmeta->root)) {
struct dm_config_node *meta1 = vgmeta_ret->root;
struct dm_config_node *meta2 = vgmeta->root;
struct dm_config_node *sib1 = meta1->sib;
struct dm_config_node *sib2 = meta2->sib;
/*
* Do not compare the extraneous data that
* export_vg_to_config_tree() inserts next to the
* actual VG metadata. This includes creation_time
* which may not match since it is generated separately
* for each call to create the config tree.
*
* We're saving the sibling pointer and restoring it
* after the compare because we're unsure if anything
* later might want it.
*
* FIXME: make it clearer what we're doing here, e.g.
* pass a parameter to export_vg_to_config_tree()
* telling it to skip the extraneous data, or something.
* It's very non-obvious that setting sib=NULL does that.
*/
meta1->sib = NULL;
meta2->sib = NULL;
if (compare_config(meta1, meta2)) {
log_error("VG %s metadata comparison failed for device %s vs %s",
vg->name, dev_name(devl->dev), save_dev ? dev_name(save_dev) : "none");
_log_debug_inequality(vg->name, vgmeta_ret->root, vgmeta->root);
meta1->sib = sib1;
meta2->sib = sib2;
dm_config_destroy(vgmeta);
dm_config_destroy(vgmeta_ret);
release_vg(baton.vg);
return NULL;
}
meta1->sib = sib1;
meta2->sib = sib2;
dm_config_destroy(vgmeta);
}