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lvmetad: Keep the cache consistent when a PV moves around.

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In cases where PV appears on a new device without disappearing from an old one
first, the device->pvid pointers could become ambiguous. This could cause the
ambiguous PV to be lost from the cache when a different PV comes up on one of
the ambiguous devices.
This commit is contained in:
Petr Rockai 2014-02-28 10:59:12 +01:00
parent a368698672
commit bf29eabdba
2 changed files with 46 additions and 3 deletions
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15
daemons/lvmetad/lvmetad-core.c
View File

@ -861,7 +861,7 @@ static response pv_found(lvmetad_state *s, request r)
const char *vgid = daemon_request_str(r, "metadata/id", NULL);
const char *vgid_old = NULL;
struct dm_config_node *pvmeta = dm_config_find_node(r.cft->root, "pvmeta");
uint64_t device;
uint64_t device, device_old_pvid = 0;
struct dm_config_tree *cft, *pvmeta_old_dev = NULL, *pvmeta_old_pvid = NULL;
char *old;
char *pvid_dup;
@ -883,9 +883,12 @@ static response pv_found(lvmetad_state *s, request r)
dm_hash_remove(s->pvid_to_pvmeta, old);
vgid_old = dm_hash_lookup(s->pvid_to_vgid, old);
}
pvmeta_old_pvid = dm_hash_lookup(s->pvid_to_pvmeta, pvid);
DEBUGLOG(s, "pv_found %s, vgid = %s, device = %" PRIu64 ", old = %s", pvid, vgid, device, old);
if ((pvmeta_old_pvid = dm_hash_lookup(s->pvid_to_pvmeta, pvid)))
dm_config_get_uint64(pvmeta_old_pvid->root, "pvmeta/device", &device_old_pvid);
DEBUGLOG(s, "pv_found %s, vgid = %s, device = %" PRIu64 " (previously %" PRIu64 "), old = %s",
pvid, vgid, device, device_old_pvid, old);
dm_free(old);
@ -903,6 +906,11 @@ static response pv_found(lvmetad_state *s, request r)
return reply_fail("out of memory");
}
if (pvmeta_old_pvid && device != device_old_pvid) {
DEBUGLOG(s, "pv %s no longer on device %" PRIu64, pvid, device_old_pvid);
dm_hash_remove_binary(s->device_to_pvid, &device_old_pvid, sizeof(device_old_pvid));
}
if (!dm_hash_insert(s->pvid_to_pvmeta, pvid, cft) ||
!dm_hash_insert_binary(s->device_to_pvid, &device, sizeof(device), (void*)pvid_dup)) {
dm_hash_remove(s->pvid_to_pvmeta, pvid);
@ -911,6 +919,7 @@ static response pv_found(lvmetad_state *s, request r)
dm_free(pvid_dup);
return reply_fail("out of memory");
}
if (pvmeta_old_pvid)
dm_config_destroy(pvmeta_old_pvid);
if (pvmeta_old_dev && pvmeta_old_dev != pvmeta_old_pvid)

34
test/shell/lvmetad-ambiguous.sh Normal file
View File

@ -0,0 +1,34 @@
#!/bin/sh
# Copyright (C) 2012 Red Hat, Inc. All rights reserved.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
. lib/test
test -e LOCAL_LVMETAD || skip
aux prepare_pvs 2
# flip the devices around
aux init_udev_transaction
dmsetup remove -f "$dev1"
dmsetup remove -f "$dev2"
dmsetup create -u TEST-${PREFIX}pv2 ${PREFIX}pv2 ${PREFIX}pv2.table
dmsetup create -u TEST-${PREFIX}pv1 ${PREFIX}pv1 ${PREFIX}pv1.table
aux finish_udev_transaction
# re-scan them
pvscan --cache $dev1
pvscan --cache $dev2
# expect both to be there
pvs | tee pvs.txt
grep $dev1 pvs.txt
grep $dev2 pvs.txt