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block: Allow .bdrv_load/save_vmstate() to return 0/-errno

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The return value of .bdrv_load/save_vmstate() can be any non-negative
number in case of success now. It used to be bytes/-errno.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-06-10 17:57:26 +02:00
parent 5ddda0b8f0
commit b433d9424d
1 changed files with 15 additions and 2 deletions
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17
block/io.c
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@ -1848,9 +1848,16 @@ int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
.iov_base = (void *) buf,
.iov_len = size,
};
int ret;
qemu_iovec_init_external(&qiov, &iov, 1);
return bdrv_writev_vmstate(bs, &qiov, pos);
ret = bdrv_writev_vmstate(bs, &qiov, pos);
if (ret < 0) {
return ret;
}
return size;
}
int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos)
@ -1876,9 +1883,15 @@ int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
.iov_base = buf,
.iov_len = size,
};
int ret;
qemu_iovec_init_external(&qiov, &iov, 1);
return bdrv_readv_vmstate(bs, &qiov, pos);
ret = bdrv_readv_vmstate(bs, &qiov, pos);
if (ret < 0) {
return ret;
}
return size;
}
int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos)