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qemu-nbd: Use BlockBackend where reasonable

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Because qemu-nbd creates the BlockBackend by itself, it should create
the according BlockDriverState tree by itself as well; that means, it
has call bdrv_open() on its own. This is one of the places where
qemu-nbd still needs to use a BlockDriverState directly (the root BDS
below the BB); other places are the configuration of zero detection
(which may be lifted into the BB eventually, but is not yet) and
temporarily loading a snapshot.

Everywhere else, though, qemu-nbd can and thus should use BlockBackend.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1416309679-333-7-git-send-email-mreitz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2014-11-18 12:21:19 +01:00 committed by Kevin Wolf
parent aadf99a792
commit 4c58e80acd
1 changed files with 5 additions and 5 deletions
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10
qemu-nbd.c
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@ -146,7 +146,7 @@ static void read_partition(uint8_t *p, struct partition_record *r)
r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24;
}
static int find_partition(BlockDriverState *bs, int partition,
static int find_partition(BlockBackend *blk, int partition,
off_t *offset, off_t *size)
{
struct partition_record mbr[4];
@ -155,7 +155,7 @@ static int find_partition(BlockDriverState *bs, int partition,
int ext_partnum = 4;
int ret;
if ((ret = bdrv_read(bs, 0, data, 1)) < 0) {
if ((ret = blk_read(blk, 0, data, 1)) < 0) {
errno = -ret;
err(EXIT_FAILURE, "error while reading");
}
@ -175,7 +175,7 @@ static int find_partition(BlockDriverState *bs, int partition,
uint8_t data1[512];
int j;
if ((ret = bdrv_read(bs, mbr[i].start_sector_abs, data1, 1)) < 0) {
if ((ret = blk_read(blk, mbr[i].start_sector_abs, data1, 1)) < 0) {
errno = -ret;
err(EXIT_FAILURE, "error while reading");
}
@ -720,10 +720,10 @@ int main(int argc, char **argv)
}
bs->detect_zeroes = detect_zeroes;
fd_size = bdrv_getlength(bs);
fd_size = blk_getlength(blk);
if (partition != -1) {
ret = find_partition(bs, partition, &dev_offset, &fd_size);
ret = find_partition(blk, partition, &dev_offset, &fd_size);
if (ret < 0) {
errno = -ret;
err(EXIT_FAILURE, "Could not find partition %d", partition);