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zdb: fix BRT dump (#16335)

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BRT refcounts are stored as eight uint8_ts rather than a single
uint64_t. This means that za_first_integer is only the first byte, so
max 256. This fixes it by doing a lookup for the whole value.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.

Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
This commit is contained in:
Rob Norris 2024-07-19 03:51:27 +10:00 committed by Tony Hutter
parent bb946ff232
commit 25ec9a9034
1 changed files with 7 additions and 2 deletions
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9
cmd/zdb/zdb.c
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@ -2208,8 +2208,13 @@ dump_brt(spa_t *spa)
for (zap_cursor_init(&zc, brt->brt_mos, brtvd->bv_mos_entries);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
uint64_t offset = *(uint64_t *)za.za_name;
uint64_t refcnt = za.za_first_integer;
uint64_t refcnt;
VERIFY0(zap_lookup_uint64(brt->brt_mos,
brtvd->bv_mos_entries,
(const uint64_t *)za.za_name, 1,
za.za_integer_length, za.za_num_integers, &refcnt));
uint64_t offset = *(const uint64_t *)za.za_name;
snprintf(dva, sizeof (dva), "%" PRIu64 ":%llx", vdevid,
(u_longlong_t)offset);