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stand: Move i386_devdesc to a union

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Rather than have the magic, hand-crafted fields that have to align with
fields in other structures at the end of i386_devdesc, make it into
anonymous union and adjust the code accordingly. This is safer and
similar to what CAM does.

Sponsored by:		Netflix
Reviewed by:		kevans, tsoome (prior version)
Differential Revision:	https://reviews.freebsd.org/D35965
This commit is contained in:
Warner Losh 2022-08-11 09:04:08 -06:00
parent bec11d9631
commit f197c0bf3e
3 changed files with 32 additions and 37 deletions
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28
stand/i386/libi386/libi386.h
View File

@ -27,25 +27,23 @@
*/
#include "disk.h"
#ifdef LOADER_ZFS_SUPPORT
#include "libzfs.h"
#endif
/*
* i386 fully-qualified device descriptor.
*/
struct i386_devdesc {
struct devdesc dd; /* Must be first. */
union
{
struct
struct i386_devdesc
{
union
{
int slice;
int partition;
off_t offset;
} biosdisk;
struct
{
uint64_t pool_guid;
uint64_t root_guid;
} zfs;
} d_kind;
struct devdesc dd;
struct disk_devdesc disk;
#ifdef LOADER_ZFS_SUPPORT
struct zfs_devdesc zfs;
#endif
};
};
/*

22
stand/i386/loader/main.c
View File

@ -308,8 +308,8 @@ extract_currdev(void)
new_currdev.dd.d_unit = 0;
} else {
/* we don't know what our boot device is */
new_currdev.d_kind.biosdisk.slice = -1;
new_currdev.d_kind.biosdisk.partition = 0;
new_currdev.disk.d_slice = -1;
new_currdev.disk.d_partition = 0;
biosdev = -1;
}
#ifdef LOADER_ZFS_SUPPORT
@ -322,8 +322,8 @@ extract_currdev(void)
zargs->size >=
offsetof(struct zfs_boot_args, primary_pool)) {
/* sufficient data is provided */
new_currdev.d_kind.zfs.pool_guid = zargs->pool;
new_currdev.d_kind.zfs.root_guid = zargs->root;
new_currdev.zfs.pool_guid = zargs->pool;
new_currdev.zfs.root_guid = zargs->root;
if (zargs->size >= sizeof(*zargs) &&
zargs->primary_vdev != 0) {
sprintf(buf, "%llu", zargs->primary_pool);
@ -333,8 +333,8 @@ extract_currdev(void)
}
} else {
/* old style zfsboot block */
new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
new_currdev.d_kind.zfs.root_guid = 0;
new_currdev.zfs.pool_guid = kargs->zfspool;
new_currdev.zfs.root_guid = 0;
}
new_currdev.dd.d_dev = &zfs_dev;
@ -350,14 +350,12 @@ extract_currdev(void)
#endif
} else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
/* The passed-in boot device is bad */
new_currdev.d_kind.biosdisk.slice = -1;
new_currdev.d_kind.biosdisk.partition = 0;
new_currdev.disk.d_slice = -1;
new_currdev.disk.d_partition = 0;
biosdev = -1;
} else {
new_currdev.d_kind.biosdisk.slice =
B_SLICE(initial_bootdev) - 1;
new_currdev.d_kind.biosdisk.partition =
B_PARTITION(initial_bootdev);
new_currdev.disk.d_slice = B_SLICE(initial_bootdev) - 1;
new_currdev.disk.d_partition = B_PARTITION(initial_bootdev);
biosdev = initial_bootinfo->bi_bios_dev;
/*

19
stand/i386/zfsboot/zfsboot.c
View File

@ -467,8 +467,8 @@ load(void)
if (bdev->dd.d_dev->dv_type == DEVT_ZFS) {
zfsargs.size = sizeof(zfsargs);
zfsargs.pool = bdev->d_kind.zfs.pool_guid;
zfsargs.root = bdev->d_kind.zfs.root_guid;
zfsargs.pool = bdev->zfs.pool_guid;
zfsargs.root = bdev->zfs.root_guid;
#ifdef LOADER_GELI_SUPPORT
export_geli_boot_data(&zfsargs.gelidata);
#endif
@ -481,8 +481,8 @@ load(void)
__exec((caddr_t)addr, RB_BOOTINFO | (opts & RBX_MASK),
bootdev,
KARGS_FLAGS_ZFS | KARGS_FLAGS_EXTARG,
(uint32_t)bdev->d_kind.zfs.pool_guid,
(uint32_t)(bdev->d_kind.zfs.pool_guid >> 32),
(uint32_t)bdev->zfs.pool_guid,
(uint32_t)(bdev->zfs.pool_guid >> 32),
VTOP(&bootinfo),
zfsargs);
} else {
@ -528,13 +528,12 @@ mount_root(char *arg)
free(bdev);
bdev = ddesc;
if (bdev->dd.d_dev->dv_type == DEVT_DISK) {
if (bdev->d_kind.biosdisk.partition == -1)
if (bdev->disk.d_partition == -1)
part = 0xff;
else
part = bdev->d_kind.biosdisk.partition;
part = bdev->disk.d_partition;
bootdev = MAKEBOOTDEV(dev_maj[bdev->dd.d_dev->dv_type],
bdev->d_kind.biosdisk.slice + 1,
bdev->dd.d_unit, part);
bdev->disk.d_slice + 1, bdev->dd.d_unit, part);
bootinfo.bi_bios_dev = bd_unit2bios(bdev);
}
strncpy(boot_devname, root, sizeof (boot_devname));
@ -714,8 +713,8 @@ i386_zfs_probe(void)
if (pool_guid != 0 && bdev == NULL) {
bdev = malloc(sizeof (struct i386_devdesc));
bzero(bdev, sizeof (struct i386_devdesc));
bdev->dd.d_dev = &zfs_dev;
bdev->d_kind.zfs.pool_guid = pool_guid;
bdev->zfs.dd.d_dev = &zfs_dev;
bdev->zfs.pool_guid = pool_guid;
}
}
}