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Distinguish between "no partition" and "choose best partition" with a constant.

Browse source 
The values of the d_slice and d_partition fields of a disk_devdesc have a
few values with special meanings in the disk_open() routine. Through various
evolutions of the loader code over time, a d_partition value of -1 has
meant both "use the first ufs partition found in the bsd label" and "don't
open a bsd partition at all, open the raw slice."

This defines a new special value of -2 to mean open the raw slice, and it
gives symbolic names to all the special values used in d_slice and
d_partition, and adjusts all existing uses of those fields to use the new
constants.

The phab review for this timed out without being accepted, but I'm still
citing it below because there is useful commentary there.

Differential Revision:	https://reviews.freebsd.org/D19262
This commit is contained in:
Ian Lepore 2019-03-24 18:51:52 +00:00
parent 6d51c0fe72
commit 14243f8de7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=345477
13 changed files with 69 additions and 60 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
stand/common/disk.c
View file

@ -129,15 +129,8 @@ ptable_print(void *arg, const char *pname, const struct ptable_entry *part)
dev.dd.d_dev = pa->dev->dd.d_dev;
dev.dd.d_unit = pa->dev->dd.d_unit;
dev.d_slice = part->index;
dev.d_partition = -1;
dev.d_partition = D_PARTNONE;
if (disk_open(&dev, partsize, sectsize) == 0) {
/*
* disk_open() for partition -1 on a bsd slice assumes
* you want the first bsd partition. Reset things so
* that we're looking at the start of the raw slice.
*/
dev.d_partition = -1;
dev.d_offset = part->start;
table = ptable_open(&dev, partsize, sectsize, ptblread);
if (table != NULL) {
sprintf(line, " %s%s", pa->prefix, pname);
@ -244,8 +237,8 @@ disk_open(struct disk_devdesc *dev, uint64_t mediasize, u_int sectorsize)
*/
memcpy(&partdev, dev, sizeof(partdev));
partdev.d_offset = 0;
partdev.d_slice = -1;
partdev.d_partition = -1;
partdev.d_slice = D_SLICENONE;
partdev.d_partition = D_PARTNONE;
dev->d_offset = 0;
table = NULL;
@ -373,9 +366,9 @@ disk_fmtdev(struct disk_devdesc *dev)
char *cp;
cp = buf + sprintf(buf, "%s%d", dev->dd.d_dev->dv_name, dev->dd.d_unit);
if (dev->d_slice >= 0) {
if (dev->d_slice > D_SLICENONE) {
#ifdef LOADER_GPT_SUPPORT
if (dev->d_partition == 255) {
if (dev->d_partition == D_PARTISGPT) {
sprintf(cp, "p%d:", dev->d_slice);
return (buf);
} else
@ -384,7 +377,7 @@ disk_fmtdev(struct disk_devdesc *dev)
cp += sprintf(cp, "s%d", dev->d_slice);
#endif
}
if (dev->d_partition >= 0)
if (dev->d_partition > D_PARTNONE)
cp += sprintf(cp, "%c", dev->d_partition + 'a');
strcat(cp, ":");
return (buf);
@ -398,7 +391,9 @@ disk_parsedev(struct disk_devdesc *dev, const char *devspec, const char **path)
char *cp;
np = devspec;
unit = slice = partition = -1;
unit = -1;
slice = D_SLICEWILD;
partition = D_PARTWILD;
if (*np != '\0' && *np != ':') {
unit = strtol(np, &cp, 10);
if (cp == np)

29
stand/common/disk.h
View file

@ -32,32 +32,35 @@
*
* Whole disk access:
*
* d_slice = -1
* d_partition = -1
* d_slice = D_SLICENONE
* d_partition = <doesn't matter>
*
* Whole MBR slice:
*
* d_slice = MBR slice number (typically 1..4)
* d_partition = -1
* d_partition = D_PARTNONE
*
* BSD disklabel partition within an MBR slice:
*
* d_slice = MBR slice number (typically 1..4)
* d_partition = disklabel partition (typically 0..19)
* d_partition = disklabel partition (typically 0..19 or D_PARTWILD)
*
* BSD disklabel partition on the true dedicated disk:
*
* d_slice = -1
* d_partition = disklabel partition (typically 0..19)
* d_slice = D_SLICENONE
* d_partition = disklabel partition (typically 0..19 or D_PARTWILD)
*
* GPT partition:
*
* d_slice = GPT partition number (typically 1..N)
* d_partition = 255
* d_partition = D_PARTISGPT
*
* For both MBR and GPT, to automatically find the 'best' slice or partition,
* set d_slice to zero. This uses the partition type to decide which partition
* to use according to the following list of preferences:
* For MBR, setting d_partition to D_PARTWILD will automatically use the first
* partition within the slice.
*
* For both MBR and GPT, to automatically find the 'best' slice and partition,
* set d_slice to D_SLICEWILD. This uses the partition type to decide which
* partition to use according to the following list of preferences:
*
* FreeBSD (active)
* FreeBSD (inactive)
@ -81,6 +84,12 @@
#ifndef _DISK_H
#define _DISK_H
#define D_SLICENONE -1
#define D_SLICEWILD 0
#define D_PARTNONE -1
#define D_PARTWILD -2
#define D_PARTISGPT 255
struct disk_devdesc {
struct devdesc dd; /* Must be first. */
int d_slice;

4
stand/efi/libefi/efipart.c
View file

@ -813,8 +813,8 @@ efipart_print_common(struct devsw *dev, pdinfo_list_t *pdlist, int verbose)
pd->pd_blkio = blkio;
pd_dev.dd.d_dev = dev;
pd_dev.dd.d_unit = pd->pd_unit;
pd_dev.d_slice = -1;
pd_dev.d_partition = -1;
pd_dev.d_slice = D_SLICENONE;
pd_dev.d_partition = D_PARTNONE;
ret = disk_open(&pd_dev, blkio->Media->BlockSize *
(blkio->Media->LastBlock + 1),
blkio->Media->BlockSize);

6
stand/efi/loader/main.c
View file

@ -217,12 +217,12 @@ set_currdev_pdinfo(pdinfo_t *dp)
currdev.dd.d_dev = dp->pd_devsw;
if (dp->pd_parent == NULL) {
currdev.dd.d_unit = dp->pd_unit;
currdev.d_slice = -1;
currdev.d_partition = -1;
currdev.d_slice = D_SLICENONE;
currdev.d_partition = D_PARTNONE;
} else {
currdev.dd.d_unit = dp->pd_parent->pd_unit;
currdev.d_slice = dp->pd_unit;
currdev.d_partition = 255; /* Assumes GPT */
currdev.d_partition = D_PARTISGPT; /* XXX Assumes GPT */
}
set_currdev_devdesc((struct devdesc *)&currdev);
} else {

8
stand/i386/libi386/biosdisk.c
View file

@ -691,8 +691,8 @@ bd_print_common(struct devsw *dev, bdinfo_list_t *bdi, int verbose)
devd.dd.d_dev = dev;
devd.dd.d_unit = i;
devd.d_slice = -1;
devd.d_partition = -1;
devd.d_slice = D_SLICENONE;
devd.d_partition = D_PARTNONE;
if (disk_open(&devd,
bd->bd_sectorsize * bd->bd_sectors,
bd->bd_sectorsize) == 0) {
@ -745,8 +745,8 @@ bd_disk_get_sectors(struct disk_devdesc *dev)
disk.dd.d_dev = dev->dd.d_dev;
disk.dd.d_unit = dev->dd.d_unit;
disk.d_slice = -1;
disk.d_partition = -1;
disk.d_slice = D_SLICENONE;
disk.d_partition = D_PARTNONE;
disk.d_offset = 0;
size = bd->bd_sectors * bd->bd_sectorsize;

2
stand/libsa/zfs/zfs.c
View file

@ -588,7 +588,7 @@ zfs_probe_dev(const char *devname, uint64_t *pool_guid)
int slice = dev->d_slice;
free(dev);
if (partition != -1 && slice != -1) {
if (partition != D_PARTNONE && slice != D_SLICENONE) {
ret = zfs_probe(pa.fd, pool_guid);
if (ret == 0)
return (0);

4
stand/mips/beri/loader/beri_disk_cfi.c
View file

@ -129,8 +129,8 @@ beri_cfi_disk_print(int verbose)
return (ret);
dev.dd.d_dev = &beri_cfi_disk;
dev.dd.d_unit = 0;
dev.d_slice = -1;
dev.d_partition = -1;
dev.d_slice = D_SLICENONE;
dev.d_partition = D_PARTNONE;
if (disk_open(&dev, cfi_get_mediasize(), cfi_get_sectorsize()) == 0) {
snprintf(line, sizeof(line), " cfi%d", 0);
ret = disk_print(&dev, line, verbose);

4
stand/mips/beri/loader/beri_disk_sdcard.c
View file

@ -135,8 +135,8 @@ beri_sdcard_disk_print(int verbose)
return (ret);
dev.dd.d_dev = &beri_sdcard_disk;
dev.dd.d_unit = 0;
dev.d_slice = -1;
dev.d_partition = -1;
dev.d_slice = D_SLICENONE;
dev.d_partition = D_PARTNONE;
if (disk_open(&dev, altera_sdcard_get_mediasize(),
altera_sdcard_get_sectorsize()) == 0) {
snprintf(line, sizeof(line), " sdcard%d", 0);

29
stand/uboot/common/main.c
View file

@ -213,8 +213,8 @@ get_load_device(int *type, int *unit, int *slice, int *partition)
*type = DEV_TYP_NONE;
*unit = -1;
*slice = 0;
*partition = -1;
*slice = D_SLICEWILD;
*partition = D_PARTWILD;
devstr = ub_env_get("loaderdev");
if (devstr == NULL) {
@ -295,7 +295,7 @@ get_load_device(int *type, int *unit, int *slice, int *partition)
if (p == endp) {
*type = DEV_TYP_NONE;
*unit = -1;
*slice = 0;
*slice = D_SLICEWILD;
return;
}
@ -309,7 +309,7 @@ get_load_device(int *type, int *unit, int *slice, int *partition)
if (*p != '.') {
*type = DEV_TYP_NONE;
*unit = -1;
*slice = 0;
*slice = D_SLICEWILD;
return;
}
@ -329,8 +329,8 @@ get_load_device(int *type, int *unit, int *slice, int *partition)
/* Junk beyond partition number. */
*type = DEV_TYP_NONE;
*unit = -1;
*slice = 0;
*partition = -1;
*slice = D_SLICEWILD;
*partition = D_PARTWILD;
}
static void
@ -339,15 +339,20 @@ print_disk_probe_info()
char slice[32];
char partition[32];
if (currdev.d_disk.d_slice > 0)
sprintf(slice, "%d", currdev.d_disk.d_slice);
if (currdev.d_disk.d_slice == D_SLICENONE)
strlcpy(slice, "<none>", sizeof(slice));
else if (currdev.d_disk.d_slice == D_SLICEWILD)
strlcpy(slice, "<auto>", sizeof(slice));
else
strcpy(slice, "<auto>");
snprintf(slice, sizeof(slice), "%d", currdev.d_disk.d_slice);
if (currdev.d_disk.d_partition >= 0)
sprintf(partition, "%d", currdev.d_disk.d_partition);
if (currdev.d_disk.d_partition == D_PARTNONE)
strlcpy(partition, "<none>", sizeof(partition));
else if (currdev.d_disk.d_partition == D_PARTWILD)
strlcpy(partition, "<auto>", sizeof(partition));
else
strcpy(partition, "<auto>");
snprintf(partition, sizeof(partition), "%d",
currdev.d_disk.d_partition);
printf(" Checking unit=%d slice=%s partition=%s...",
currdev.dd.d_unit, slice, partition);

4
stand/uboot/lib/disk.c
View file

@ -254,8 +254,8 @@ stor_print(int verbose)
for (i = 0; i < stor_info_no; i++) {
dev.dd.d_dev = &uboot_storage;
dev.dd.d_unit = i;
dev.d_slice = -1;
dev.d_partition = -1;
dev.d_slice = D_SLICENONE;
dev.d_partition = D_PARTNONE;
snprintf(line, sizeof(line), "\tdisk%d (%s)\n", i,
ub_stor_type(SI(&dev).type));
if ((ret = pager_output(line)) != 0)

4
stand/usb/storage/umass_loader.c
View file

@ -196,8 +196,8 @@ umass_disk_print(int verbose)
return (ret);
dev.d_dev = &umass_disk;
dev.d_unit = 0;
dev.d_slice = -1;
dev.d_partition = -1;
dev.d_slice = D_SLICENONE;
dev.d_partition = D_PARTNONE;
if (umass_disk_open_sub(&dev) == 0) {
ret = disk_print(&dev, " umass0", verbose);

8
stand/userboot/userboot/main.c
View file

@ -240,15 +240,15 @@ extract_currdev(void)
if (userboot_disk_maxunit > 0) {
dev.dd.d_dev = &userboot_disk;
dev.dd.d_unit = 0;
dev.d_slice = 0;
dev.d_partition = 0;
dev.d_slice = D_SLICEWILD;
dev.d_partition = D_PARTWILD;
/*
* If we cannot auto-detect the partition type then
* access the disk as a raw device.
*/
if (dev.dd.d_dev->dv_open(NULL, &dev)) {
dev.d_slice = -1;
dev.d_partition = -1;
dev.d_slice = D_SLICENONE;
dev.d_partition = D_PARTNONE;
}
dd = &dev.dd;
} else {

4
stand/userboot/userboot/userboot_disk.c
View file

@ -137,8 +137,8 @@ userdisk_print(int verbose)
break;
dev.dd.d_dev = &userboot_disk;
dev.dd.d_unit = i;
dev.d_slice = -1;
dev.d_partition = -1;
dev.d_slice = D_SLICENONE;
dev.d_partition = D_PARTNONE;
if (disk_open(&dev, ud_info[i].mediasize,
ud_info[i].sectorsize) == 0) {
snprintf(line, sizeof(line), " disk%d", i);