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disk: part: implement generic function part_get_info_by_name()

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So far partition search by name has been supported only on the EFI partition
table. This patch extends the search to all partition tables.

Rename part_get_info_efi_by_name() to part_get_info_by_name(), move it from
part_efi.c into part.c and make it a generic function which traverses all part
drivers and searches all partitions (in the order given by the linked list).

For this a new variable struct part_driver.max_entries is added, which limits
the number of partitions searched. For EFI this was GPT_ENTRY_NUMBERS.
Similarly the limit is defined for DOS, ISO, MAC and AMIGA partition tables.

Signed-off-by: Petr Kulhavy <brain@jikos.cz>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Steve Rae <steve.rae@raedomain.com>
This commit is contained in:
Petr Kulhavy
2016-09-09 10:27:15 +02:00
committed by Tom Rini
parent ba07984068
commit 87b8530fe2
8 changed files with 53 additions and 33 deletions
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26
disk/part.c
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@@ -615,3 +615,29 @@ cleanup:
free(dup_str);
return ret;
}
int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
disk_partition_t *info)
{
struct part_driver *first_drv =
ll_entry_start(struct part_driver, part_driver);
const int n_drvs = ll_entry_count(struct part_driver, part_driver);
struct part_driver *part_drv;
for (part_drv = first_drv; part_drv != first_drv + n_drvs; part_drv++) {
int ret;
int i;
for (i = 1; i < part_drv->max_entries; i++) {
ret = part_drv->get_info(dev_desc, i, info);
if (ret != 0) {
/* no more entries in table */
break;
}
if (strcmp(name, (const char *)info->name) == 0) {
/* matched */
return 0;
}
}
}
return -1;
}