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efi_alloc_and_init, efi_alloc_and_read, efi_free, efi_write, efi_use_whole_disk - manipulate a disk's EFI Partition Table

cc [ flag .\|.\|. ] file.\|.\|. -lefi [ library .\|.\|. ]
#include <sys/vtoc.h>
#include <sys/efi_partition.h>

int efi_alloc_and_init(int fd, uint32_t nparts, dk_gpt_t **vtoc);

int efi_alloc_and_read(int fd, dk_gpt_t **vtoc);

void efi_free(dk_gpt_t *vtoc);

int efi_write(int fd, dk_gpt_t *vtoc);

int efi_use_whole_disk(int fd);

The efi_alloc_and_init() function initializes the dk_gpt_t structure specified by vtoc in preparation for a call to efi_write(). It calculates and initializes the efi_version, efi_lbasize, efi_nparts, efi_first_u_lba, efi_last_lba, and efi_last_u_lba members of this sturcture. The caller can then set the efi_nparts member.

The efi_alloc_and_read() function allocates memory and returns the partition table.

The efi_free() function frees the memory allocated by efi_alloc_and_init() and efi_alloc_and_read().

The efi_write() function writes the EFI partition table.

The efi_use_whole_disk() function takes any space that is not contained in the disk label and adds it to the last physically non-zero area before the reserved slice (from slice 0 to slice 6 or unallocated space).

The fd argument refers to any slice on a raw disk, opened with O_NDELAY. See open(2).

The nparts argument specifies the number of desired partitions.

The vtoc argument is a dk_gpt_t structure that describes an EFI partition table and contains at least the following members:

uint_t efi_version; /* set to EFI_VERSION_CURRENT */
uint_t efi_nparts; /* number of partitions in efi_parts */
uint_t efi_lbasize; /* size of block in bytes */
diskaddr_t efi_last_lba; /* last block on the disk */
diskaddr_t efi_first_u_lba; /* first block after labels */
diskaddr_t efi_last_u_lba; /* last block before backup labels */
struct dk_part efi_parts[]; /* array of partitions */

Upon successful completion, efi_alloc_and_init() returns 0. Otherwise it returns VT_EIO if an I/O operation to the disk fails.

Upon successful completion, efi_alloc_and_read() returns a positive integer indicating the slice index associated with the open file descriptor. Otherwise, it returns a negative integer to indicate one of the following:

VT_EIO

VT_ERROR

VT_EINVAL

Upon successful completion, efi_write() returns 0. Otherwise, it returns a negative integer to indicate one of the following:

VT_EIO

VT_ERROR

VT_EINVAL

Upon successfully completion, efi_use_whole_disk() returns 0. Otherwise, it returns a negative integer to indicate one of the following:

VT_EIO

VT_ERROR

VT_EINVAL

VT_ENOSPC

The EFI label is used on disks with more than 1^32-1 blocks. For compatibility reasons, the read_vtoc(3EXT) and write_vtoc() functions should be used on smaller disks. The application should attempt the read_vtoc() or write_vtoc() call, check for an error of VT_ENOTSUP, then call the analogous EFI function.

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Committed
MT-Level	Unsafe

fmthard(1M), format(1M), prtvtoc(1M), ioctl(2), open(2), libefi(3LIB), read_vtoc(3EXT), attributes(5), dkio(7I)