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stand/boot1.efi: Implement bootonce for ZFS

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Implement ZFS bootonce protocol. We pass zfs-bootonce=t to the next boot
stage as a command line argument. Unlike zfsboot -> loader handoff in
the BIOS case, we don't use the OS_BOOTONCE_USED. This would require
modifications to loader.efi which would only server to make it more
complicated. Instead, use the command line parsing interface for the
boot1.efi -> loader.efi to pass in the zfs-bootonce kenv that will be
needed by rc.d/zfsbe to activate the BE if boot progresses that far.

Sponsored by:		Netflix
Reviewed by:		tsoome, kevans
Differential Revision:	https://reviews.freebsd.org/D39412
This commit is contained in:
Warner Losh 2023-05-01 09:27:14 -06:00
parent b765cfa380
commit 43f7eeff0d
1 changed files with 26 additions and 1 deletions
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27
stand/efi/boot1/zfs_module.c
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@ -40,6 +40,8 @@
static dev_info_t *devices;
static char zfs_bootonce[VDEV_PAD_SIZE];
uint64_t
ldi_get_size(void *priv)
{
@ -165,6 +167,16 @@ load(const char *filepath, dev_info_t *devinfo, void **bufp, size_t *bufsize)
return (EFI_NOT_FOUND);
}
/*
* OK. We've found a filesystem. Any attempt to use it should clear the
* 'once' flag. Prior to now, we'd not be able to clear it anyway. We
* don't care if we can't find the files to boot, or if there's a
* problem with it: we've tried to use it once we're able to mount the
* ZFS dataset.
*/
*zfs_bootonce = '\0';
zfs_get_bootonce_spa(spa, OS_BOOTONCE, zfs_bootonce, sizeof(zfs_bootonce));
if ((err = zfs_lookup(&zmount, filepath, &dn)) != 0) {
if (err == ENOENT) {
DPRINTF("Failed to find '%s' on pool '%s' (%d)\n",
@ -220,6 +232,18 @@ status(void)
printf("\n");
}
static const char *
extra_env(void)
{
char *rv = NULL; /* So we return NULL if asprintf fails */
if (*zfs_bootonce == '\0')
return NULL;
asprintf(&rv, "zfs-bootonce=%s", zfs_bootonce);
return (rv);
}
static void
init(void)
{
@ -241,5 +265,6 @@ const boot_module_t zfs_module =
.probe = probe,
.load = load,
.status = status,
.devices = _devices
.devices = _devices,
.extra_env = extra_env,
};