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disk/part: introduce get_device_and_partition

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All block device related commands (scsiboot, fatload, ext2ls, etc.) have
simliar duplicated device and partition parsing and selection code. This
adds a common function to replace various implementations.

The new function has an enhancement over current versions. If no device
or partition is specified on the command line, the bootdevice env variable
will be used (scsiboot does this).

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
This commit is contained in:
Rob Herring 2012-09-21 04:08:17 +00:00 committed by Tom Rini
parent 40e0e5686a
commit 99d2c205d4
2 changed files with 78 additions and 4 deletions
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69
disk/part.c
View file

@ -70,7 +70,7 @@ static const struct block_drvr block_drvr[] = {
DECLARE_GLOBAL_DATA_PTR;
block_dev_desc_t *get_dev(char* ifname, int dev)
block_dev_desc_t *get_dev(const char *ifname, int dev)
{
const struct block_drvr *drvr = block_drvr;
block_dev_desc_t* (*reloc_get_dev)(int dev);
@ -97,7 +97,7 @@ block_dev_desc_t *get_dev(char* ifname, int dev)
return NULL;
}
#else
block_dev_desc_t *get_dev(char* ifname, int dev)
block_dev_desc_t *get_dev(const char *ifname, int dev)
{
return NULL;
}
@ -288,6 +288,7 @@ void init_part (block_dev_desc_t * dev_desc)
return;
}
#endif
dev_desc->part_type = PART_TYPE_UNKNOWN;
}
@ -441,3 +442,67 @@ int get_partition_info(block_dev_desc_t *dev_desc, int part
return -1;
}
int get_device_and_partition(const char *ifname, const char *dev_str,
block_dev_desc_t **dev_desc,
disk_partition_t *info)
{
int ret;
char *ep;
int dev;
block_dev_desc_t *desc;
int part = 0;
char *part_str;
if (dev_str)
dev = simple_strtoul(dev_str, &ep, 16);
if (!dev_str || (dev_str == ep)) {
dev_str = getenv("bootdevice");
if (dev_str)
dev = simple_strtoul(dev_str, &ep, 16);
if (!dev_str || (dev_str == ep))
goto err;
}
desc = get_dev(ifname, dev);
if (!desc || (desc->type == DEV_TYPE_UNKNOWN))
goto err;
if (desc->part_type == PART_TYPE_UNKNOWN) {
/* disk doesn't use partition table */
if (!desc->lba) {
printf("**Bad disk size - %s %d:0 **\n", ifname, dev);
return -1;
}
info->start = 0;
info->size = desc->lba;
info->blksz = desc->blksz;
*dev_desc = desc;
return 0;
}
part_str = strchr(dev_str, ':');
if (part_str)
part = (int)simple_strtoul(++part_str, NULL, 16);
ret = get_partition_info(desc, part, info);
if (ret) {
printf("** Invalid partition %d, use `dev[:part]' **\n", part);
return -1;
}
if (strncmp((char *)info->type, BOOT_PART_TYPE, sizeof(info->type)) != 0) {
printf("** Invalid partition type \"%.32s\""
" (expect \"" BOOT_PART_TYPE "\")\n",
info->type);
return -1;
}
*dev_desc = desc;
return part;
err:
puts("** Invalid boot device, use `dev[:part]' **\n");
return -1;
}

13
include/part.h
View file

@ -98,7 +98,7 @@ typedef struct disk_partition {
/* Misc _get_dev functions */
#ifdef CONFIG_PARTITIONS
block_dev_desc_t* get_dev(char* ifname, int dev);
block_dev_desc_t *get_dev(const char *ifname, int dev);
block_dev_desc_t* ide_get_dev(int dev);
block_dev_desc_t* sata_get_dev(int dev);
block_dev_desc_t* scsi_get_dev(int dev);
@ -112,8 +112,12 @@ int get_partition_info (block_dev_desc_t * dev_desc, int part, disk_partition_t
void print_part (block_dev_desc_t *dev_desc);
void init_part (block_dev_desc_t *dev_desc);
void dev_print(block_dev_desc_t *dev_desc);
int get_device_and_partition(const char *ifname, const char *dev_str,
block_dev_desc_t **dev_desc,
disk_partition_t *info);
#else
static inline block_dev_desc_t* get_dev(char* ifname, int dev) { return NULL; }
static inline block_dev_desc_t *get_dev(const char *ifname, int dev)
{ return NULL; }
static inline block_dev_desc_t* ide_get_dev(int dev) { return NULL; }
static inline block_dev_desc_t* sata_get_dev(int dev) { return NULL; }
static inline block_dev_desc_t* scsi_get_dev(int dev) { return NULL; }
@ -127,6 +131,11 @@ static inline int get_partition_info (block_dev_desc_t * dev_desc, int part,
static inline void print_part (block_dev_desc_t *dev_desc) {}
static inline void init_part (block_dev_desc_t *dev_desc) {}
static inline void dev_print(block_dev_desc_t *dev_desc) {}
static inline int get_device_and_partition(const char *ifname,
const char *dev_str,
block_dev_desc_t **dev_desc,
disk_partition_t *info)
{ *dev_desc = NULL; return -1; }
#endif
#ifdef CONFIG_MAC_PARTITION