Author: pjd
Date: Tue Feb 19 23:35:55 2019
New Revision: 344316
URL: https://svnweb.freebsd.org/changeset/base/344316
Log:
The way ZFS searches for its vdevs is the following: first it looks for
a vdev that has the same name as the one stored in metadata and that has
all VDEV labels in place. If it cannot find a GEOM provider with the given
name and all VDEV labels it will scan all GEOM providers for the best match
(the most VDEV labels available), but here the name is ignored.
In case the ZFS pool is created, eg. using GPT partition label:
# zpool create tank /dev/gpt/tank
everything works, and on every import ZFS will pick /dev/gpt/tank and
not /dev/da0p4.
The problem occurs when da0p4 is extended and ZFS is unable to find all
VDEV labels in /dev/gpt/tank anymore (the VDEV labels stored at the end
of the partition are now somewhere else). In this case it will scan all
GEOM providers and will pick the first one with the best match, ie. da0p4.
Fix this problem by checking the VDEV/provider name even if we get the same
match. If the name is the same as the one we have in pool's metadata, prefer
this GEOM provider.
Reported by: oshogbo, Michal Mroz <[email protected]>
Tested by: Michal Mroz <[email protected]>
Obtained from: Fudo Security
Modified:
head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c Tue Feb
19 23:24:39 2019 (r344315)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c Tue Feb
19 23:35:55 2019 (r344316)
@@ -692,10 +692,12 @@ vdev_geom_attach_by_guids(vdev_t *vd)
struct g_geom *gp;
struct g_provider *pp, *best_pp;
struct g_consumer *cp;
+ const char *vdpath;
enum match match, best_match;
g_topology_assert();
+ vdpath = vd->vdev_path + sizeof("/dev/") - 1;
cp = NULL;
best_pp = NULL;
best_match = NO_MATCH;
@@ -710,6 +712,10 @@ vdev_geom_attach_by_guids(vdev_t *vd)
if (match > best_match) {
best_match = match;
best_pp = pp;
+ } else if (match == best_match) {
+ if (strcmp(pp->name, vdpath) == 0) {
+ best_pp = pp;
+ }
}
if (match == FULL_MATCH)
goto out;
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