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Report ashift of L2ARC devices in zdb 

Commit 8af1104f does not actually store the ashift of cache devices in
their label. However, in order to facilitate reporting the ashift
through zdb, we enable this in the present commit. We also document
how the retrieval of the ashift is done.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #15331
This commit is contained in:
George Amanakis 2023-10-03 01:57:09 +02:00 committed by GitHub
parent e135388564
commit fe4d055b36
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 1 deletions
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2
cmd/zdb/zdb.c
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@ -5179,7 +5179,7 @@ dump_label(const char *dev)
if (nvlist_size(config, &size, NV_ENCODE_XDR) != 0)
size = buflen;
/* If the device is a cache device clear the header. */
/* If the device is a cache device read the header. */
if (!read_l2arc_header) {
if (nvlist_lookup_uint64(config,
ZPOOL_CONFIG_POOL_STATE, &l2cache) == 0 &&

10
module/zfs/vdev_label.c
View File

@ -1138,6 +1138,16 @@ vdev_label_init(vdev_t *vd, uint64_t crtxg, vdev_labeltype_t reason)
POOL_STATE_L2CACHE) == 0);
VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_GUID,
vd->vdev_guid) == 0);
/*
* This is merely to facilitate reporting the ashift of the
* cache device through zdb. The actual retrieval of the
* ashift (in vdev_alloc()) uses the nvlist
* spa->spa_l2cache->sav_config (populated in
* spa_ld_open_aux_vdevs()).
*/
VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_ASHIFT,
vd->vdev_ashift) == 0);
} else {
uint64_t txg = 0ULL;