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gpt: add write function and gptrepair command

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The first hint of something practical, a command that can restore any of
the GPT structures from the alternate location. New test case must run
under QEMU because the loopback device used by the other unit tests does
not support writing.
This commit is contained in:
Michael Marineau 2014-10-19 14:21:29 -07:00
parent 478458d404
commit 051545ddf0
6 changed files with 277 additions and 4 deletions
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8
include/grub/gpt_partition.h
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@ -103,6 +103,11 @@ typedef enum grub_gpt_status
} grub_gpt_status_t;
#define GRUB_GPT_MBR_VALID (GRUB_GPT_PROTECTIVE_MBR|GRUB_GPT_HYBRID_MBR)
#define GRUB_GPT_PRIMARY_VALID \
(GRUB_GPT_PRIMARY_HEADER_VALID|GRUB_GPT_PRIMARY_ENTRIES_VALID)
#define GRUB_GPT_BACKUP_VALID \
(GRUB_GPT_BACKUP_HEADER_VALID|GRUB_GPT_BACKUP_ENTRIES_VALID)
#define GRUB_GPT_BOTH_VALID (GRUB_GPT_PRIMARY_VALID|GRUB_GPT_BACKUP_VALID)
/* UEFI requires the entries table to be at least 16384 bytes for a
* total of 128 entries given the standard 128 byte entry size. */
@ -144,6 +149,9 @@ grub_gpt_t grub_gpt_read (grub_disk_t disk);
/* Sync up primary and backup headers, recompute checksums. */
grub_err_t grub_gpt_repair (grub_disk_t disk, grub_gpt_t gpt);
/* Write headers and entry tables back to disk. */
grub_err_t grub_gpt_write (grub_disk_t disk, grub_gpt_t gpt);
void grub_gpt_free (grub_gpt_t gpt);
grub_err_t grub_gpt_pmbr_check (struct grub_msdos_partition_mbr *mbr);