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Add no-upgrade featureflag

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Adds a featureflag that is not enabled during upgrades unless listed
explicitly. This is useful for features that could cause issues unless
applied carefully; for example, a feature that could make a root pool
unbootable if bootloaders don't yet have support for it.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <rob.norris@klarasystems.com>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Signed-off-by: Paul Dagnelie <paul.dagnelie@klarasystems.com>
Closes #17004
This commit is contained in:
Paul Dagnelie 2025-07-03 11:03:30 -07:00 committed by Brian Behlendorf
parent 4c2a7f85d5
commit e845be28e7
4 changed files with 23 additions and 6 deletions
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13
cmd/zpool/zpool_main.c
View File

@ -11330,7 +11330,8 @@ upgrade_enable_all(zpool_handle_t *zhp, int *countp)
const char *fname = spa_feature_table[i].fi_uname;
const char *fguid = spa_feature_table[i].fi_guid;
if (!spa_feature_table[i].fi_zfs_mod_supported)
if (!spa_feature_table[i].fi_zfs_mod_supported ||
(spa_feature_table[i].fi_flags & ZFEATURE_FLAG_NO_UPGRADE))
continue;
if (!nvlist_exists(enabled, fguid) && requested_features[i]) {
@ -11485,7 +11486,11 @@ upgrade_list_disabled_cb(zpool_handle_t *zhp, void *arg)
"Note that the pool "
"'compatibility' feature can be "
"used to inhibit\nfeature "
"upgrades.\n\n"));
"upgrades.\n\n"
"Features marked with (*) are not "
"applied automatically on upgrade, "
"and\nmust be applied explicitly "
"with zpool-set(7).\n\n"));
(void) printf(gettext("POOL "
"FEATURE\n"));
(void) printf(gettext("------"
@ -11499,7 +11504,9 @@ upgrade_list_disabled_cb(zpool_handle_t *zhp, void *arg)
poolfirst = B_FALSE;
}
(void) printf(gettext(" %s\n"), fname);
(void) printf(gettext(" %s%s\n"), fname,
spa_feature_table[i].fi_flags &
ZFEATURE_FLAG_NO_UPGRADE ? "(*)" : "");
}
/*
* If they did "zpool upgrade -a", then we could

10
include/zfeature_common.h
View File

@ -103,7 +103,15 @@ typedef enum zfeature_flags {
/* Activate this feature at the same time it is enabled. */
ZFEATURE_FLAG_ACTIVATE_ON_ENABLE = (1 << 2),
/* Each dataset has a field set if it has ever used this feature. */
ZFEATURE_FLAG_PER_DATASET = (1 << 3)
ZFEATURE_FLAG_PER_DATASET = (1 << 3),
/*
* This feature isn't enabled by zpool upgrade; it must be explicitly
* listed to be enabled. It will also be applied if listed in an
* explicitly provided compatibility list. This flag can be removed
* from a given feature once support is sufficiently widespread, or
* worries about backwards compatibility are no longer relevant.
*/
ZFEATURE_FLAG_NO_UPGRADE = (1 << 4)
} zfeature_flags_t;
typedef enum zfeature_type {

3
lib/libzfs/libzfs_pool.c
View File

@ -5093,9 +5093,10 @@ zpool_load_compat(const char *compat, boolean_t *features, char *report,
/* special cases (unset), "" and "off" => enable all features */
if (compat == NULL || compat[0] == '\0' ||
strcmp(compat, ZPOOL_COMPAT_OFF) == 0) {
if (features != NULL)
if (features != NULL) {
for (uint_t i = 0; i < SPA_FEATURES; i++)
features[i] = B_TRUE;
}
if (report != NULL)
strlcpy(report, gettext("all features enabled"), rlen);
return (ZPOOL_COMPATIBILITY_OK);

3
lib/libzfs/libzfs_status.c
View File

@ -484,7 +484,8 @@ check_status(nvlist_t *config, boolean_t isimport,
}
for (i = 0; i < SPA_FEATURES; i++) {
zfeature_info_t *fi = &spa_feature_table[i];
if (!fi->fi_zfs_mod_supported)
if (!fi->fi_zfs_mod_supported ||
(fi->fi_flags & ZFEATURE_FLAG_NO_UPGRADE))
continue;
if (c_features[i] && !nvlist_exists(feat, fi->fi_guid))
return (ZPOOL_STATUS_FEAT_DISABLED);