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libfdisk: (gpt) returns location of the backup header too 

Reported-by: Lennart Poettering <lennart@poettering.net>
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2021-03-19 14:54:34 +01:00
parent 1ad8db5521
commit 93737ad351
2 changed files with 25 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
libfdisk/src/gpt.c
View File

@ -1247,6 +1247,18 @@ static int gpt_locate_disklabel(struct fdisk_context *cxt, int n,
*offset = (uint64_t) le64_to_cpu(gpt->pheader->partition_entry_lba) *
cxt->sector_size;
return gpt_sizeof_entries(gpt->pheader, size);
case 3:
*name = _("GPT Backup Entries");
gpt = self_label(cxt);
*offset = (uint64_t) le64_to_cpu(gpt->bheader->partition_entry_lba) *
cxt->sector_size;
return gpt_sizeof_entries(gpt->bheader, size);
case 4:
*name = _("GPT Backup Header");
gpt = self_label(cxt);
*offset = (uint64_t) le64_to_cpu(gpt->pheader->alternative_lba) * cxt->sector_size;
*size = sizeof(struct gpt_header);
break;
default:
return 1; /* no more chunks */
}

16
libfdisk/src/label.c
View File

@ -393,9 +393,19 @@ int fdisk_create_disklabel(struct fdisk_context *cxt, const char *name)
* @offset: return offset where is item
* @size: of the item
*
* Locate disklabel and returns info about @n item of the label. For example
* GPT is composed from two items, PMBR and GPT, n=0 return offset to PMBR and n=1
* return offset to GPT. For more details see 'D' expert fdisk command.
* Locate disklabel and returns info about @n item of the label.
*
* For example GPT is composed from three items, PMBR and GPT, n=0 return
* offset to PMBR and n=1 return offset to GPT Header and n=2 returns offset to
* GPT array of partitions, n=3 and n=4 returns location of the backup GPT
* label at the end of the disk.
*
* The function returns the current in-memory situation. It's possible that a
* header location is modified by write operation, for example when enabled
* minimization (see fdisk_gpt_enable_minimize()). In this case it's better to
* call this function after fdisk_write_disklabel().
*
* For more details see 'D' expert fdisk command.
*
* Returns: 0 on success, <0 on error, 1 no more items.
*/