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Store the L2ARC device ashift in the vdev label 

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 Brian Behlendorf
parent c12b5829e1
commit f28cd347c4
2 changed files with 11 additions and 11 deletions
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3
module/zfs/vdev_label.c
View File

@ -468,6 +468,9 @@ 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()
@ -75,10 +74,8 @@ 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