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disk: efi: unify code for finding a valid gpt

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There were 3 copies of the same sequence, make it into a function.

Signed-off-by: Urja Rannikko <urjaman@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Urja Rannikko 2019-04-11 20:27:50 +00:00 committed by Kever Yang
parent fa177ff020
commit 20c568cae6
1 changed files with 34 additions and 39 deletions
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73
disk/part_efi.c
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@ -51,6 +51,8 @@ static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
gpt_header *pgpt_head);
static int is_pte_valid(gpt_entry * pte);
static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head,
gpt_entry **pgpt_pte);
static char *print_efiname(gpt_entry *pte)
{
@ -192,19 +194,8 @@ int get_disk_guid(struct blk_desc * dev_desc, char *guid)
unsigned char *guid_bin;
/* This function validates AND fills in the GPT header and PTE */
if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
if (is_gpt_valid(dev_desc, dev_desc->lba - 1,
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid Backup GPT ***\n",
__func__);
return -EINVAL;
} else {
printf("%s: *** Using Backup GPT ***\n",
__func__);
}
}
if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
return -EINVAL;
guid_bin = gpt_head->disk_guid.b;
uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);
@ -223,19 +214,8 @@ void part_print_efi(struct blk_desc *dev_desc)
unsigned char *uuid_bin;
/* This function validates AND fills in the GPT header and PTE */
if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid Backup GPT ***\n",
__func__);
return;
} else {
printf("%s: *** Using Backup GPT ***\n",
__func__);
}
}
if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
return;
debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
@ -284,19 +264,8 @@ int part_get_info_efi(struct blk_desc *dev_desc, int part,
}
/* This function validates AND fills in the GPT header and PTE */
if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
gpt_head, &gpt_pte) != 1) {
printf("%s: *** ERROR: Invalid Backup GPT ***\n",
__func__);
return -1;
} else {
printf("%s: *** Using Backup GPT ***\n",
__func__);
}
}
if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
return -1;
if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
!is_pte_valid(&gpt_pte[part - 1])) {
@ -996,6 +965,32 @@ static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
return 1;
}
/**
* find_valid_gpt() - finds a valid GPT header and PTEs
*
* gpt is a GPT header ptr, filled on return.
* ptes is a PTEs ptr, filled on return.
*
* Description: returns 1 if found a valid gpt, 0 on error.
* If valid, returns pointers to PTEs.
*/
static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head,
gpt_entry **pgpt_pte)
{
if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
gpt_head, pgpt_pte) != 1) {
printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
gpt_head, pgpt_pte) != 1) {
printf("%s: *** ERROR: Invalid Backup GPT ***\n",
__func__);
return 0;
}
printf("%s: *** Using Backup GPT ***\n", __func__);
}
return 1;
}
/**
* alloc_read_gpt_entries(): reads partition entries from disk
* @dev_desc