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Add BRT support to zpool prefetch command

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Implement BRT (Block Reference Table) prefetch functionality similar
to existing DDT prefetch.  This allows preloading BRT metadata into
ARC to improve performance for block cloning operations and frees
of earlier cloned blocks.

Make -t parameter optional.  When omitted, prefetch all supported
metadata types (both DDT and BRT now).

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #17890
This commit is contained in:
Alexander Motin
2025-11-10 19:16:22 -05:00
committed by GitHub
parent cc5cae5475
commit b4f073b5a6
12 changed files with 198 additions and 42 deletions
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cmd/zpool/zpool_main.c
+20 -14
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@@ -494,8 +494,7 @@ get_usage(zpool_help_t idx)
"[--json-int, --json-pool-key-guid]] ...\n"
"\t [-T d|u] [pool] [interval [count]]\n"));
case HELP_PREFETCH:
return (gettext("\tprefetch -t <type> [<type opts>] <pool>\n"
"\t -t ddt <pool>\n"));
return (gettext("\tprefetch [-t <type>] <pool>\n"));
case HELP_OFFLINE:
return (gettext("\toffline [--power]|[[-f][-t]] <pool> "
"<device> ...\n"));
@@ -4200,7 +4199,7 @@ zpool_do_checkpoint(int argc, char **argv)
#define CHECKPOINT_OPT 1024
/*
* zpool prefetch <type> [<type opts>] <pool>
* zpool prefetch [-t <type>] <pool>
*
* Prefetchs a particular type of data in the specified pool.
*/
@@ -4245,20 +4244,27 @@ zpool_do_prefetch(int argc, char **argv)
poolname = argv[0];
argc--;
argv++;
if (strcmp(typestr, "ddt") == 0) {
type = ZPOOL_PREFETCH_DDT;
} else {
(void) fprintf(stderr, gettext("unsupported prefetch type\n"));
usage(B_FALSE);
}
if ((zhp = zpool_open(g_zfs, poolname)) == NULL)
return (1);
err = zpool_prefetch(zhp, type);
if (typestr == NULL) {
/* Prefetch all types */
err = zpool_prefetch(zhp, ZPOOL_PREFETCH_DDT);
if (err == 0)
err = zpool_prefetch(zhp, ZPOOL_PREFETCH_BRT);
} else {
if (strcmp(typestr, "ddt") == 0) {
type = ZPOOL_PREFETCH_DDT;
} else if (strcmp(typestr, "brt") == 0) {
type = ZPOOL_PREFETCH_BRT;
} else {
(void) fprintf(stderr,
gettext("unsupported prefetch type\n"));
zpool_close(zhp);
usage(B_FALSE);
}
err = zpool_prefetch(zhp, type);
}
zpool_close(zhp);