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disk: part: Add API to get partitions with specific driver

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Adds part_driver_get_type() API which can be used to force a specific
driver to be used when getting partition information instead of relying
on auto detection.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Joshua Watt 2023-07-03 08:39:54 -05:00 committed by Tom Rini
parent 44ef2855e1
commit 387f8be55b
2 changed files with 49 additions and 8 deletions
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38
disk/part.c
View file

@ -26,6 +26,22 @@
/* Check all partition types */
#define PART_TYPE_ALL -1
static struct part_driver *part_driver_get_type(int part_type)
{
struct part_driver *drv =
ll_entry_start(struct part_driver, part_driver);
const int n_ents = ll_entry_count(struct part_driver, part_driver);
struct part_driver *entry;
for (entry = drv; entry != drv + n_ents; entry++) {
if (part_type == entry->part_type)
return entry;
}
/* Not found */
return NULL;
}
static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
{
struct part_driver *drv =
@ -44,10 +60,7 @@ static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
}
}
} else {
for (entry = drv; entry != drv + n_ents; entry++) {
if (dev_desc->part_type == entry->part_type)
return entry;
}
return part_driver_get_type(dev_desc->part_type);
}
/* Not found */
@ -322,8 +335,8 @@ void part_print(struct blk_desc *dev_desc)
drv->print(dev_desc);
}
int part_get_info(struct blk_desc *dev_desc, int part,
struct disk_partition *info)
int part_get_info_by_type(struct blk_desc *dev_desc, int part, int part_type,
struct disk_partition *info)
{
struct part_driver *drv;
@ -336,7 +349,12 @@ int part_get_info(struct blk_desc *dev_desc, int part,
info->type_guid[0] = 0;
#endif
drv = part_driver_lookup_type(dev_desc);
if (part_type == PART_TYPE_UNKNOWN) {
drv = part_driver_lookup_type(dev_desc);
} else {
drv = part_driver_get_type(part_type);
}
if (!drv) {
debug("## Unknown partition table type %x\n",
dev_desc->part_type);
@ -356,6 +374,12 @@ int part_get_info(struct blk_desc *dev_desc, int part,
return -ENOENT;
}
int part_get_info(struct blk_desc *dev_desc, int part,
struct disk_partition *info)
{
return part_get_info_by_type(dev_desc, part, PART_TYPE_UNKNOWN, info);
}
int part_get_info_whole_disk(struct blk_desc *dev_desc,
struct disk_partition *info)
{

19
include/part.h
View file

@ -105,7 +105,24 @@ struct blk_desc *blk_get_dev(const char *ifname, int dev);
struct blk_desc *mg_disk_get_dev(int dev);
/* disk/part.c */
/**
* part_get_info_by_type() - Get partitions from a block device using a specific
* partition driver
*
* Each interface allocates its own devices and typically struct blk_desc is
* contained with the interface's data structure. There is no global
* numbering for block devices, so the interface name must be provided.
*
* @dev_desc: Block device descriptor
* @part: Partition number to read
* @part_type: Partition driver to use, or PART_TYPE_UNKNOWN to automatically
* choose a driver
* @info: Returned partition information
*
* Return: 0 on success, negative errno on failure
*/
int part_get_info_by_type(struct blk_desc *dev_desc, int part, int part_type,
struct disk_partition *info);
int part_get_info(struct blk_desc *dev_desc, int part,
struct disk_partition *info);
/**