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disk: part: Extend API to get partition info 

This patch adds part_get_info_by_dev_and_name_or_num() function which
allows us to get partition info from its number or name. Partition of
interest is specified by string like "device_num:partition_number" or
"device_num#partition_name".

The patch was extracted from [1].

[1] https://android-review.googlesource.com/c/platform/external/u-boot/+/729880/2

Signed-off-by: Ruslan Trofymenko <ruslan.trofymenko@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
Reviewed-by: Alistair Strachan <astrachan@google.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Ruslan Trofymenko 2019-07-05 15:37:31 +03:00 committed by Tom Rini
parent 37f1811a0b
commit 6eccd1f740
2 changed files with 89 additions and 0 deletions
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68
disk/part.c
View File

@ -674,6 +674,74 @@ int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
return part_get_info_by_name_type(dev_desc, name, info, PART_TYPE_ALL);
}
/**
* Get partition info from device number and partition name.
*
* Parse a device number and partition name string in the form of
* "device_num#partition_name", for example "0#misc". If the partition
* is found, sets dev_desc and part_info accordingly with the information
* of the partition with the given partition_name.
*
* @param[in] dev_iface Device interface
* @param[in] dev_part_str Input string argument, like "0#misc"
* @param[out] dev_desc Place to store the device description pointer
* @param[out] part_info Place to store the partition information
* @return 0 on success, or a negative on error
*/
static int part_get_info_by_dev_and_name(const char *dev_iface,
const char *dev_part_str,
struct blk_desc **dev_desc,
disk_partition_t *part_info)
{
char *ep;
const char *part_str;
int dev_num;
part_str = strchr(dev_part_str, '#');
if (!part_str || part_str == dev_part_str)
return -EINVAL;
dev_num = simple_strtoul(dev_part_str, &ep, 16);
if (ep != part_str) {
/* Not all the first part before the # was parsed. */
return -EINVAL;
}
part_str++;
*dev_desc = blk_get_dev(dev_iface, dev_num);
if (!*dev_desc) {
printf("Could not find %s %d\n", dev_iface, dev_num);
return -EINVAL;
}
if (part_get_info_by_name(*dev_desc, part_str, part_info) < 0) {
printf("Could not find \"%s\" partition\n", part_str);
return -EINVAL;
}
return 0;
}
int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
const char *dev_part_str,
struct blk_desc **dev_desc,
disk_partition_t *part_info)
{
/* Split the part_name if passed as "$dev_num#part_name". */
if (!part_get_info_by_dev_and_name(dev_iface, dev_part_str,
dev_desc, part_info))
return 0;
/*
* Couldn't lookup by name, try looking up the partition description
* directly.
*/
if (blk_get_device_part_str(dev_iface, dev_part_str,
dev_desc, part_info, 1) < 0) {
printf("Couldn't find partition %s %s\n",
dev_iface, dev_part_str);
return -EINVAL;
}
return 0;
}
void part_set_generic_name(const struct blk_desc *dev_desc,
int part_num, char *name)
{

21
include/part.h
View File

@ -201,6 +201,27 @@ int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name,
int part_get_info_by_name(struct blk_desc *dev_desc,
const char *name, disk_partition_t *info);
/**
* Get partition info from dev number + part name, or dev number + part number.
*
* Parse a device number and partition description (either name or number)
* in the form of device number plus partition name separated by a "#"
* (like "device_num#partition_name") or a device number plus a partition number
* separated by a ":". For example both "0#misc" and "0:1" can be valid
* partition descriptions for a given interface. If the partition is found, sets
* dev_desc and part_info accordingly with the information of the partition.
*
* @param[in] dev_iface Device interface
* @param[in] dev_part_str Input partition description, like "0#misc" or "0:1"
* @param[out] dev_desc Place to store the device description pointer
* @param[out] part_info Place to store the partition information
* @return 0 on success, or a negative on error
*/
int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
const char *dev_part_str,
struct blk_desc **dev_desc,
disk_partition_t *part_info);
/**
* part_set_generic_name() - create generic partition like hda1 or sdb2
*