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part: Support string block devices in part_get_info_by_dev_and_name

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This adds support for things like "#partname" and "0.1#partname". The block
device parsing is done like in blk_get_device_part_str.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Sean Anderson 2021-02-05 09:38:57 -05:00 • committed by Marek Vasut
parent 9f7bb2825b
commit 81c1aa89e1
1 changed files with 22 additions and 19 deletions
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41
disk/part.c
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@ -693,12 +693,13 @@ int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
* 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.
* "devicenum.hwpartnum#partition_name", for example "0.1#misc". devicenum and
* hwpartnum are both optional, defaulting to 0. 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[in] dev_part_str Input string argument, like "0.1#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
@ -708,29 +709,31 @@ static int part_get_info_by_dev_and_name(const char *dev_iface,
struct blk_desc **dev_desc,
struct disk_partition *part_info)
{
char *ep;
const char *part_str;
int dev_num, ret;
char *dup_str = NULL;
const char *dev_str, *part_str;
int ret;
/* Separate device and partition name specification */
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. */
if (part_str) {
dup_str = strdup(dev_part_str);
dup_str[part_str - dev_part_str] = 0;
dev_str = dup_str;
part_str++;
} else {
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 -ENODEV;
}
ret = blk_get_device_by_str(dev_iface, dev_str, dev_desc);
if (ret)
goto cleanup;
ret = part_get_info_by_name(*dev_desc, part_str, part_info);
if (ret < 0)
printf("Could not find \"%s\" partition\n", part_str);
cleanup:
free(dup_str);
return ret;
}