From e1bc32f7103534fe9b857c887e7c1d9e9dda850f 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 bcd520de380b..ef3920d23f5b 100644 --- a/cmd/zdb/zdb.c +++ b/cmd/zdb/zdb.c @@ -4815,7 +4815,7 @@ 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 faf89041b01f..277c14ec1ad7 100644 --- a/module/zfs/vdev_label.c +++ b/module/zfs/vdev_label.c @@ -1103,6 +1103,16 @@ 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;