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nbd: Switch to byte-based block access 

Sector-based blk_read() should die; switch to byte-based
blk_pread() instead.

Add a constant for our magic number 512, to make it obvious
that this size will NOT change even if BDRV_SECTOR_SIZE does,
even though the two happen to be the same for now.  Split
assignments from conditionals to keep checkpatch.pl happy.

Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2016-05-06 10:26:42 -06:00 committed by Kevin Wolf
parent 26a122d3d4
commit bd31c214c3
1 changed files with 9 additions and 4 deletions
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13
qemu-nbd.c
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@ -46,6 +46,8 @@
#define QEMU_NBD_OPT_TLSCREDS 261
#define QEMU_NBD_OPT_IMAGE_OPTS 262
#define MBR_SIZE 512
static NBDExport *exp;
static bool newproto;
static int verbose;
@ -159,12 +161,13 @@ static int find_partition(BlockBackend *blk, int partition,
off_t *offset, off_t *size)
{
struct partition_record mbr[4];
uint8_t data[512];
uint8_t data[MBR_SIZE];
int i;
int ext_partnum = 4;
int ret;
if ((ret = blk_read(blk, 0, data, 1)) < 0) {
ret = blk_pread(blk, 0, data, sizeof(data));
if (ret < 0) {
error_report("error while reading: %s", strerror(-ret));
exit(EXIT_FAILURE);
}
@ -182,10 +185,12 @@ static int find_partition(BlockBackend *blk, int partition,
if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
struct partition_record ext[4];
uint8_t data1[512];
uint8_t data1[MBR_SIZE];
int j;
if ((ret = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) {
ret = blk_pread(blk, mbr[i].start_sector_abs * MBR_SIZE,
data1, sizeof(data1));
if (ret < 0) {
error_report("error while reading: %s", strerror(-ret));
exit(EXIT_FAILURE);
}