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Store the L2ARC device ashift in the vdev label

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If this is not done, and the pool has an ashift other than the default
(at the moment 9) then the following happens:

1) vdev_alloc() assigns the ashift of the pool to L2ARC device, but
   upon export it is not stored anywhere
2) at the first import, vdev_open() sees an vdev_ashift() of 0 and
   assigns the logical_ashift, which is 9
3) reading the contents of L2ARC, including the header fails
4) L2ARC buffers are not restored in ARC.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #14313 
Closes #14963
This commit is contained in:
George Amanakis 2023-06-14 17:01:17 +02:00 committed by GitHub
parent feff9dfed3
commit 8af1104f83
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2 changed files with 11 additions and 11 deletions
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3
module/zfs/vdev_label.c
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@ -486,6 +486,9 @@ vdev_config_generate(spa_t *spa, vdev_t *vd, boolean_t getstats,
if (vd->vdev_isspare)
fnvlist_add_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 1);
if (flags & VDEV_CONFIG_L2CACHE)
fnvlist_add_uint64(nv, ZPOOL_CONFIG_ASHIFT, vd->vdev_ashift);
if (!(flags & (VDEV_CONFIG_SPARE | VDEV_CONFIG_L2CACHE)) &&
vd == vd->vdev_top) {
fnvlist_add_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY,

19
tests/zfs-tests/tests/functional/l2arc/persist_l2arc_001_pos.ksh
View File

@ -27,15 +27,14 @@
#
# STRATEGY:
# 1. Create pool with a cache device.
# 2. Export and re-import pool without writing any data.
# 3. Create a random file in that pool and random read for 10 sec.
# 4. Export pool.
# 5. Read the amount of log blocks written from the header of the
# 2. Create a random file in that pool and random read for 10 sec.
# 3. Export pool.
# 4. Read the amount of log blocks written from the header of the
# L2ARC device.
# 6. Import pool.
# 7. Read the amount of log blocks rebuilt in arcstats and compare to
# 5. Import pool.
# 6. Read the amount of log blocks rebuilt in arcstats and compare to
# (5).
# 8. Check if the labels of the L2ARC device are intact.
# 7. Check if the labels of the L2ARC device are intact.
#
# * We can predict the minimum bytes of L2ARC restored if we subtract
# from the effective size of the cache device the bytes l2arc_evict()
@ -77,10 +76,8 @@ export FILE_SIZE=$(( floor($fill_mb / $NUMJOBS) ))M
log_must truncate -s ${cache_sz}M $VDEV_CACHE
log_must zpool create -f $TESTPOOL $VDEV cache $VDEV_CACHE
log_must zpool export $TESTPOOL
log_must zpool import -d $VDIR $TESTPOOL
log_must zpool create -f -o ashift=12 $TESTPOOL $VDEV
log_must zpool add $TESTPOOL cache $VDEV_CACHE
log_must fio $FIO_SCRIPTS/mkfiles.fio
log_must fio $FIO_SCRIPTS/random_reads.fio