static ssize_t
read_lba(int fd, uint64_t lba, void *buffer, size_t bytes)
{
int sector_size = get_sector_size(fd);
off_t offset = lba * sector_size;
uint64_t lastlba;
ssize_t bytesread;
lseek(fd, offset, SEEK_SET);
bytesread = read(fd, buffer, bytes);
lastlba = last_lba(fd);
if (!lastlba)
return bytesread;
/* Kludge. This is necessary to read/write the last
block of an odd-sized disk, until Linux 2.5.x kernel fixes.
This is only used by gpt.c, and only to read
one sector, so we don't have to be fancy.
*/
if (!bytesread && !(lastlba & 1) && lba == lastlba) {
bytesread = read_lastoddsector(fd, lba, buffer, bytes);
}
return bytesread;
}
static ssize_t
read_lba(int fd, uint64_t lba, void *buffer, size_t bytes)
{
int sector_size = get_sector_size(fd);
off_t offset = lba * sector_size;
ssize_t bytesread;
void *iobuf;
size_t iobuf_size;
int rc;
off_t new_offset;
iobuf_size = lcm(bytes, sector_size);
rc = posix_memalign(&iobuf, sector_size, iobuf_size);
if (rc)
return rc;
memset(iobuf, 0, bytes);
new_offset = lseek(fd, offset, SEEK_SET);
if (new_offset == (off_t)-1) {
free(iobuf);
return 0;
}
bytesread = read(fd, iobuf, iobuf_size);
memcpy(buffer, iobuf, bytes);
free(iobuf);
/* Kludge. This is necessary to read/write the last
block of an odd-sized disk, until Linux 2.5.x kernel fixes.
This is only used by gpt.c, and only to read
one sector, so we don't have to be fancy.
*/
if (!bytesread && !(last_lba(fd) & 1) && lba == last_lba(fd)) {
bytesread = read_lastoddsector(fd, lba, buffer, bytes);
}
return bytesread;
}
