From fe4d055b36b8f2ec64a8b67bf4fa6366e954f82f Mon Sep 17 00:00:00 2001 From: George Amanakis Date: Tue, 3 Oct 2023 01:57:09 +0200 Subject: [PATCH] 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 Signed-off-by: George Amanakis Closes #15331 --- cmd/zdb/zdb.c | 2 +- module/zfs/vdev_label.c | 10 ++++++++++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/cmd/zdb/zdb.c b/cmd/zdb/zdb.c index 87499cdc9..b39a0e882 100644 --- a/cmd/zdb/zdb.c +++ b/cmd/zdb/zdb.c @@ -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 && diff --git a/module/zfs/vdev_label.c b/module/zfs/vdev_label.c index a5c76808f..a2e5524a8 100644 --- a/module/zfs/vdev_label.c +++ b/module/zfs/vdev_label.c @@ -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;