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MFV r348585: 9683 Allow bypassing devid in vdev_disk_open()

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illumos/illumos-gate@6fe4f3002c

Reviewed by: Sara Hartse <sara.hartse@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Dan McDonald <danmcd@joyent.com>
Author:     Pavel Zakharov <pavel.zakharov@delphix.com>

This is irrelevant to FreeBSD, just to reduce divergence.
This commit is contained in:
Alexander Motin 2019-06-03 20:55:52 +00:00
commit 0b5319dda0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=348586
1 changed files with 46 additions and 1 deletions
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47
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c
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@ -20,7 +20,7 @@
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2016 by Delphix. All rights reserved.
* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
* Copyright 2016 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2013 Joyent, Inc. All rights reserved.
*/
@ -50,6 +50,21 @@ typedef struct vdev_disk_ldi_cb {
ldi_callback_id_t lcb_id;
} vdev_disk_ldi_cb_t;
/*
* Bypass the devid when opening a disk vdev.
* There have been issues where the devids of several devices were shuffled,
* causing pool open failures. Note, that this flag is intended to be used
* for pool recovery only.
*
* Note that if a pool is imported with the devids bypassed, all its vdevs will
* cease storing devid information permanently. In practice, the devid is rarely
* useful as vdev paths do not tend to change unless the hardware is
* reconfigured. That said, if the paths do change and a pool fails to open
* automatically at boot, a simple zpool import should re-scan the paths and fix
* the issue.
*/
boolean_t vdev_disk_bypass_devid = B_FALSE;
static void
vdev_disk_alloc(vdev_t *vd)
{
@ -305,6 +320,16 @@ vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
vdev_disk_alloc(vd);
dvd = vd->vdev_tsd;
/*
* Allow bypassing the devid.
*/
if (vd->vdev_devid != NULL && vdev_disk_bypass_devid) {
vdev_dbgmsg(vd, "vdev_disk_open, devid %s bypassed",
vd->vdev_devid);
spa_strfree(vd->vdev_devid);
vd->vdev_devid = NULL;
}
/*
* When opening a disk device, we want to preserve the user's original
* intent. We always want to open the device by the path the user gave
@ -367,6 +392,19 @@ vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
if (error == 0 && vd->vdev_devid != NULL &&
ldi_get_devid(dvd->vd_lh, &devid) == 0) {
if (ddi_devid_compare(devid, dvd->vd_devid) != 0) {
/*
* A mismatch here is unexpected, log it.
*/
char *devid_str = ddi_devid_str_encode(devid,
dvd->vd_minor);
vdev_dbgmsg(vd, "vdev_disk_open: devid "
"mismatch: %s != %s", vd->vdev_devid,
devid_str);
cmn_err(CE_NOTE, "vdev_disk_open %s: devid "
"mismatch: %s != %s", vd->vdev_path,
vd->vdev_devid, devid_str);
ddi_devid_str_free(devid_str);
error = SET_ERROR(EINVAL);
(void) ldi_close(dvd->vd_lh, spa_mode(spa),
kcred);
@ -390,6 +428,10 @@ vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
if (error != 0 && vd->vdev_devid != NULL) {
error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor,
spa_mode(spa), kcred, &dvd->vd_lh, zfs_li);
if (error != 0) {
vdev_dbgmsg(vd, "Failed to open by devid (%s)",
vd->vdev_devid);
}
}
/*
@ -436,6 +478,9 @@ vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize,
vd_devid = ddi_devid_str_encode(devid, dvd->vd_minor);
vdev_dbgmsg(vd, "vdev_disk_open: update devid from "
"'%s' to '%s'", vd->vdev_devid, vd_devid);
cmn_err(CE_NOTE, "vdev_disk_open %s: update devid "
"from '%s' to '%s'", vd->vdev_path != NULL ?
vd->vdev_path : "?", vd->vdev_devid, vd_devid);
spa_strfree(vd->vdev_devid);
vd->vdev_devid = spa_strdup(vd_devid);
ddi_devid_str_free(vd_devid);