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Improve zpool labelclear

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1) As implemented the `zpool labelclear` command overwrites
the calculated offsets of all four vdev labels even when only a
single valid label is found.  If the device as been re-purposed
but still contains a valid label this can result in space no
longer owned by ZFS being zeroed.  Prevent this by verifying
every label removed is intact before it's overwritten.

2) Address a small bug in zpool_do_labelclear() which prevented
labelclear from working on file vdevs.  Only block devices support
BLKFLSBUF, try the ioctl() but when it's reported as unsupported
this should not be fatal.

3) Fix `zpool labelclear` so it can be run on vdevs which were
removed from the pool with `zpool remove`.  Additionally, allow
intact but partial labels to be cleared as in the case of a failed
`zpool attach` or `zpool replace`.

4) Remove LABELCLEAR and LABELREAD variables for test cases.

Reviewed-by: Matt Ahrens <mahrens@delphix.com>
Reviewed-by: Tim Chase <tim@chase2k.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #8500 
Closes #8373 
Closes #6261
This commit is contained in:
Brian Behlendorf 2019-03-21 10:13:01 -07:00 committed by GitHub
parent 304d469dcd
commit 066da71e7f
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
12 changed files with 246 additions and 58 deletions
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11
cmd/zpool/zpool_main.c
View File

@ -1113,13 +1113,18 @@ zpool_do_labelclear(int argc, char **argv)
return (1);
}
if (ioctl(fd, BLKFLSBUF) != 0)
/*
* Flush all dirty pages for the block device. This should not be
* fatal when the device does not support BLKFLSBUF as would be the
* case for a file vdev.
*/
if ((ioctl(fd, BLKFLSBUF) != 0) && (errno != ENOTTY))
(void) fprintf(stderr, gettext("failed to invalidate "
"cache for %s: %s\n"), vdev, strerror(errno));
if (zpool_read_label(fd, &config, NULL) != 0 || config == NULL) {
if (zpool_read_label(fd, &config, NULL) != 0) {
(void) fprintf(stderr,
gettext("failed to check state for %s\n"), vdev);
gettext("failed to read label from %s\n"), vdev);
ret = 1;
goto errout;
}

49
lib/libzfs/libzfs_import.c
View File

@ -148,23 +148,66 @@ zpool_clear_label(int fd)
int l;
vdev_label_t *label;
uint64_t size;
int labels_cleared = 0;
if (fstat64_blk(fd, &statbuf) == -1)
return (0);
size = P2ALIGN_TYPED(statbuf.st_size, sizeof (vdev_label_t), uint64_t);
if ((label = calloc(1, sizeof (vdev_label_t))) == NULL)
return (-1);
for (l = 0; l < VDEV_LABELS; l++) {
if (pwrite64(fd, label, sizeof (vdev_label_t),
uint64_t state, guid;
nvlist_t *config;
if (pread64(fd, label, sizeof (vdev_label_t),
label_offset(size, l)) != sizeof (vdev_label_t)) {
free(label);
return (-1);
continue;
}
if (nvlist_unpack(label->vl_vdev_phys.vp_nvlist,
sizeof (label->vl_vdev_phys.vp_nvlist), &config, 0) != 0) {
continue;
}
/* Skip labels which do not have a valid guid. */
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID,
&guid) != 0 || guid == 0) {
nvlist_free(config);
continue;
}
/* Skip labels which are not in a known valid state. */
if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_STATE,
&state) != 0 || state > POOL_STATE_L2CACHE) {
nvlist_free(config);
continue;
}
nvlist_free(config);
/*
* A valid label was found, overwrite this label's nvlist
* and uberblocks with zeros on disk. This is done to prevent
* system utilities, like blkid, from incorrectly detecting a
* partial label. The leading pad space is left untouched.
*/
memset(label, 0, sizeof (vdev_label_t));
size_t label_size = sizeof (vdev_label_t) - (2 * VDEV_PAD_SIZE);
if (pwrite64(fd, label, label_size, label_offset(size, l) +
(2 * VDEV_PAD_SIZE)) == label_size) {
labels_cleared++;
}
}
free(label);
if (labels_cleared == 0)
return (-1);
return (0);
}

3
tests/runfiles/linux.run
View File

@ -392,7 +392,8 @@ tests = ['zpool_import_001_pos', 'zpool_import_002_pos',
tags = ['functional', 'cli_root', 'zpool_import']
[tests/functional/cli_root/zpool_labelclear]
tests = ['zpool_labelclear_active', 'zpool_labelclear_exported']
tests = ['zpool_labelclear_active', 'zpool_labelclear_exported',
'zpool_labelclear_removed', 'zpool_labelclear_valid']
pre =
post =
tags = ['functional', 'cli_root', 'zpool_labelclear']

12
tests/zfs-tests/tests/functional/cli_root/zpool_attach/attach-o_ashift.ksh
View File

@ -51,8 +51,8 @@ log_onexit cleanup
disk1=$TEST_BASE_DIR/$FILEDISK0
disk2=$TEST_BASE_DIR/$FILEDISK1
log_must mkfile $SIZE $disk1
log_must mkfile $SIZE $disk2
log_must truncate -s $SIZE $disk1
log_must truncate -s $SIZE $disk2
typeset ashifts=("9" "10" "11" "12" "13" "14" "15" "16")
for ashift in ${ashifts[@]}
@ -84,13 +84,7 @@ do
# clean things for the next run
log_must zpool destroy $TESTPOOL1
log_must zpool labelclear $disk1
# depending on if we expect to have failed the 'zpool attach'
if [[ $cmdval -le $ashift ]]
then
log_must zpool labelclear $disk2
else
log_mustnot zpool labelclear $disk2
fi
log_must zpool labelclear $disk2
done
done

4
tests/zfs-tests/tests/functional/cli_root/zpool_labelclear/Makefile.am
View File

@ -1,7 +1,9 @@
pkgdatadir = $(datadir)/@PACKAGE@/zfs-tests/tests/functional/cli_root/zpool_labelclear
dist_pkgdata_SCRIPTS = \
zpool_labelclear_active.ksh \
zpool_labelclear_exported.ksh
zpool_labelclear_exported.ksh \
zpool_labelclear_removed.ksh \
zpool_labelclear_valid.ksh
dist_pkgdata_DATA = \
labelclear.cfg

3
tests/zfs-tests/tests/functional/cli_root/zpool_labelclear/labelclear.cfg
View File

@ -15,9 +15,6 @@
. $STF_SUITE/include/libtest.shlib
typeset LABELCLEAR="zpool labelclear"
typeset LABELREAD="zdb -lq"
typeset disks=(${DISKS[*]})
typeset disk1=${disks[0]}
typeset disk2=${disks[1]}

28
tests/zfs-tests/tests/functional/cli_root/zpool_labelclear/zpool_labelclear_active.ksh
View File

@ -43,26 +43,26 @@ log_assert "zpool labelclear will fail on all vdevs of imported pool"
log_must zpool create -O mountpoint=none -f $TESTPOOL $disk1 log $disk2
# Check that labelclear [-f] will fail on ACTIVE pool vdevs
log_mustnot $LABELCLEAR $disk1
log_must $LABELREAD $disk1
log_mustnot $LABELCLEAR -f $disk1
log_must $LABELREAD $disk1
log_mustnot $LABELCLEAR $disk2
log_must $LABELREAD $disk2
log_mustnot $LABELCLEAR -f $disk2
log_must $LABELREAD $disk2
log_mustnot zpool labelclear $disk1
log_must zdb -lq $disk1
log_mustnot zpool labelclear -f $disk1
log_must zdb -lq $disk1
log_mustnot zpool labelclear $disk2
log_must zdb -lq $disk2
log_mustnot zpool labelclear -f $disk2
log_must zdb -lq $disk2
# Add a cache/spare to the pool, check that labelclear [-f] will fail
# on the vdev and will succeed once it's removed from pool config
for vdevtype in "cache" "spare"; do
log_must zpool add $TESTPOOL $vdevtype $disk3
log_mustnot $LABELCLEAR $disk3
log_must $LABELREAD $disk3
log_mustnot $LABELCLEAR -f $disk3
log_must $LABELREAD $disk3
log_mustnot zpool labelclear $disk3
log_must zdb -lq $disk3
log_mustnot zpool labelclear -f $disk3
log_must zdb -lq $disk3
log_must zpool remove $TESTPOOL $disk3
log_must $LABELCLEAR $disk3
log_mustnot $LABELREAD $disk3
log_must zpool labelclear $disk3
log_mustnot zdb -lq $disk3
done
log_pass "zpool labelclear will fail on all vdevs of imported pool"

20
tests/zfs-tests/tests/functional/cli_root/zpool_labelclear/zpool_labelclear_exported.ksh
View File

@ -52,21 +52,21 @@ for vdevtype in "" "cache" "spare"; do
log_must zpool export $TESTPOOL
# Check that labelclear will fail without -f
log_mustnot $LABELCLEAR $disk1
log_must $LABELREAD $disk1
log_mustnot $LABELCLEAR $disk2
log_must $LABELREAD $disk2
log_mustnot zpool labelclear $disk1
log_must zdb -lq $disk1
log_mustnot zpool labelclear $disk2
log_must zdb -lq $disk2
# Check that labelclear will succeed with -f
log_must $LABELCLEAR -f $disk1
log_mustnot $LABELREAD $disk1
log_must $LABELCLEAR -f $disk2
log_mustnot $LABELREAD $disk2
log_must zpool labelclear -f $disk1
log_mustnot zdb -lq $disk1
log_must zpool labelclear -f $disk2
log_mustnot zdb -lq $disk2
# Check that labelclear on auxilary vdevs will succeed
if [[ -n $vdevtype ]]; then
log_must $LABELCLEAR $disk3
log_mustnot $LABELREAD $disk3
log_must zpool labelclear $disk3
log_mustnot zdb -lq $disk3
fi
done

62
tests/zfs-tests/tests/functional/cli_root/zpool_labelclear/zpool_labelclear_removed.ksh Executable file
View File

@ -0,0 +1,62 @@
#!/bin/ksh -p
#
# This file and its contents are supplied under the terms of the
# Common Development and Distribution License ("CDDL"), version 1.0.
# You may only use this file in accordance with the terms of version
# 1.0 of the CDDL.
#
# A full copy of the text of the CDDL should have accompanied this
# source. A copy of the CDDL is also available via the Internet at
# http://www.illumos.org/license/CDDL.
#
#
# Copyright 2016 Nexenta Systems, Inc.
# Copyright (c) 2019 by Lawrence Livermore National Security, LLC.
#
. $STF_SUITE/tests/functional/cli_root/zpool_labelclear/labelclear.cfg
# DESCRIPTION:
# Check that `zpool labelclear` can clear labels on removed devices.
#
# STRATEGY:
# 1. Create a pool with primary, log, spare and cache devices.
# 2. Remove a top-level vdev, log, spare, and cache device.
# 3. Run `zpool labelclear` on the removed device.
# 4. Verify the label has been removed.
#
verify_runnable "global"
function cleanup
{
poolexists $TESTPOOL && destroy_pool $TESTPOOL
rm -f $DEVICE1 $DEVICE2 $DEVICE3 $DEVICE4 $DEVICE5
}
log_onexit cleanup
log_assert "zpool labelclear works for removed devices"
DEVICE1="$TEST_BASE_DIR/device-1"
DEVICE2="$TEST_BASE_DIR/device-2"
DEVICE3="$TEST_BASE_DIR/device-3"
DEVICE4="$TEST_BASE_DIR/device-4"
DEVICE5="$TEST_BASE_DIR/device-5"
log_must truncate -s $((SPA_MINDEVSIZE * 8)) $DEVICE1
log_must truncate -s $SPA_MINDEVSIZE $DEVICE2 $DEVICE3 $DEVICE4 $DEVICE5
log_must zpool create -f $TESTPOOL $DEVICE1 $DEVICE2 \
log $DEVICE3 cache $DEVICE4 spare $DEVICE5
log_must zpool sync
# Remove each type of vdev and verify the label can be cleared.
for dev in $DEVICE5 $DEVICE4 $DEVICE3 $DEVICE2; do
log_must zpool remove $TESTPOOL $dev
log_must zpool sync $TESTPOOL
log_must zpool labelclear $dev
log_mustnot zdb -lq $dev
done
log_pass "zpool labelclear works for removed devices"

91
tests/zfs-tests/tests/functional/cli_root/zpool_labelclear/zpool_labelclear_valid.ksh Executable file
View File

@ -0,0 +1,91 @@
#!/bin/ksh -p
#
# This file and its contents are supplied under the terms of the
# Common Development and Distribution License ("CDDL"), version 1.0.
# You may only use this file in accordance with the terms of version
# 1.0 of the CDDL.
#
# A full copy of the text of the CDDL should have accompanied this
# source. A copy of the CDDL is also available via the Internet at
# http://www.illumos.org/license/CDDL.
#
#
# Copyright 2016 Nexenta Systems, Inc.
# Copyright (c) 2019 by Lawrence Livermore National Security, LLC.
#
. $STF_SUITE/tests/functional/cli_root/zpool_labelclear/labelclear.cfg
# DESCRIPTION:
# Check that `zpool labelclear` only clears valid labels. Expected
# label offsets which do not contain intact labels are left untouched.
#
# STRATEGY:
# 1. Create a pool with primary, log, spare and cache devices.
# 2. Export the pool.
# 3. Write a known pattern over the first two device labels.
# 4. Verify with zdb that only the last two device labels are intact.
# 5. Verify the pool could be imported using those labels.
# 6. Run `zpool labelclear` to destroy those last two labels.
# 7. Verify the pool can no longer be found; let alone imported.
# 8. Verify the pattern is intact to confirm `zpool labelclear` did
# not write to first two label offsets.
# 9. Verify that no valid label remain.
#
verify_runnable "global"
function cleanup
{
poolexists $TESTPOOL && destroy_pool $TESTPOOL
rm -f $PATTERN_FILE $DEVICE1 $DEVICE2 $DEVICE3 $DEVICE4
}
log_onexit cleanup
log_assert "zpool labelclear will only clear valid labels"
PATTERN_FILE=$TEST_BASE_DIR/pattern
DEVICE1="$TEST_BASE_DIR/device-1"
DEVICE2="$TEST_BASE_DIR/device-2"
DEVICE3="$TEST_BASE_DIR/device-3"
DEVICE4="$TEST_BASE_DIR/device-4"
log_must dd if=/dev/urandom of=$PATTERN_FILE bs=1048576 count=4
log_must truncate -s $SPA_MINDEVSIZE $DEVICE1 $DEVICE2 $DEVICE3 $DEVICE4
log_must zpool create -O mountpoint=none -f $TESTPOOL $DEVICE1 \
log $DEVICE2 cache $DEVICE3 spare $DEVICE4
log_must zpool export $TESTPOOL
# Overwrite the first 4M of each device and verify the expected labels.
for dev in $DEVICE1 $DEVICE2 $DEVICE3 $DEVICE4; do
dd if=$PATTERN_FILE of=$dev bs=1048576 conv=notrunc
log_must eval "zdb -l $dev | grep 'labels = 2 3'"
done
# Verify the pool could be imported using those labels.
log_must eval "zpool import -d $TEST_BASE_DIR | grep $TESTPOOL"
# Verify the last two labels on each vdev can be cleared.
for dev in $DEVICE1 $DEVICE2 $DEVICE3 $DEVICE4; do
log_must zpool labelclear -f $dev
done
# Verify there is no longer a pool which can be imported.
log_mustnot eval "zpool import -d $TEST_BASE_DIR | grep $TESTPOOL"
# Verify the original pattern over the first two labels is intact
for dev in $DEVICE1 $DEVICE2 $DEVICE3 $DEVICE4; do
log_must cmp -n $((4 * 1048576)) $dev $PATTERN_FILE
log_mustnot zdb -lq $dev
done
# Verify an error is reported when there are no labels to clear.
for dev in $DEVICE1 $DEVICE2 $DEVICE3 $DEVICE4; do
log_mustnot zpool labelclear -f $dev
done
log_pass "zpool labelclear will only clear valid labels"

15
tests/zfs-tests/tests/functional/cli_root/zpool_replace/replace-o_ashift.ksh
View File

@ -51,8 +51,8 @@ log_onexit cleanup
disk1=$TEST_BASE_DIR/$FILEDISK0
disk2=$TEST_BASE_DIR/$FILEDISK1
log_must mkfile $SIZE $disk1
log_must mkfile $SIZE $disk2
log_must truncate -s $SIZE $disk1
log_must truncate -s $SIZE $disk2
typeset ashifts=("9" "10" "11" "12" "13" "14" "15" "16")
for ashift in ${ashifts[@]}
@ -84,15 +84,8 @@ do
fi
# clean things for the next run
log_must zpool destroy $TESTPOOL1
# depending on if we expect to have failed the 'zpool replace'
if [[ $cmdval -le $ashift ]]
then
log_mustnot zpool labelclear $disk1
log_must zpool labelclear $disk2
else
log_must zpool labelclear $disk1
log_mustnot zpool labelclear $disk2
fi
log_must zpool labelclear $disk1
log_must zpool labelclear $disk2
done
done

6
tests/zfs-tests/tests/functional/cli_root/zpool_replace/replace_prop_ashift.ksh
View File

@ -52,8 +52,8 @@ log_onexit cleanup
disk1=$TEST_BASE_DIR/$FILEDISK0
disk2=$TEST_BASE_DIR/$FILEDISK1
log_must mkfile $SIZE $disk1
log_must mkfile $SIZE $disk2
log_must truncate -s $SIZE $disk1
log_must truncate -s $SIZE $disk2
typeset ashifts=("9" "10" "11" "12" "13" "14" "15" "16")
for ashift in ${ashifts[@]}
@ -89,7 +89,7 @@ do
fi
# clean things for the next run
log_must zpool destroy $TESTPOOL1
log_mustnot zpool labelclear $disk1
log_must zpool labelclear $disk1
log_must zpool labelclear $disk2
done
done