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block/vvfat: qcow driver may not be found

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Although virtually impossible right now, bdrv_find_format("qcow") may
fail. The vvfat block driver should heed that case.

Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 1bcb15cf77)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Max Reitz 2014-12-02 18:32:43 +01:00 committed by Michael Roth
parent 1b9ea8961a
commit b3729b2ec2
1 changed files with 6 additions and 0 deletions
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6
block/vvfat.c
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@ -2926,6 +2926,12 @@ static int enable_write_target(BDRVVVFATState *s, Error **errp)
}
bdrv_qcow = bdrv_find_format("qcow");
if (!bdrv_qcow) {
error_setg(errp, "Failed to locate qcow driver");
ret = -ENOENT;
goto err;
}
opts = qemu_opts_create(bdrv_qcow->create_opts, NULL, 0, &error_abort);
qemu_opt_set_number(opts, BLOCK_OPT_SIZE, s->sector_count * 512);
qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, "fat:");