* @src - source buffer, @src_size bytes
*
* Returns: compressed size on success
- * -1 destination buffer is not enough to store compressed data
- * -2 on any other error
+ * -ENOMEM destination buffer is not enough to store compressed data
+ * -EIO on any other error
*/
static ssize_t qcow2_compress(void *dest, size_t dest_size,
const void *src, size_t src_size)
ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
-12, 9, Z_DEFAULT_STRATEGY);
if (ret != Z_OK) {
- return -2;
+ return -EIO;
}
/* strm.next_in is not const in old zlib versions, such as those used on
if (ret == Z_STREAM_END) {
ret = dest_size - strm.avail_out;
} else {
- ret = (ret == Z_OK ? -1 : -2);
+ ret = (ret == Z_OK ? -ENOMEM : -EIO);
}
deflateEnd(&strm);
BDRVQcow2State *s = bs->opaque;
QEMUIOVector hd_qiov;
int ret;
- size_t out_len;
+ ssize_t out_len;
uint8_t *buf, *out_buf;
uint64_t cluster_offset;
out_len = qcow2_co_compress(bs, out_buf, s->cluster_size - 1,
buf, s->cluster_size);
- if (out_len == -2) {
- ret = -EINVAL;
- goto fail;
- } else if (out_len == -1) {
+ if (out_len == -ENOMEM) {
/* could not compress: write normal cluster */
ret = qcow2_co_pwritev(bs, offset, bytes, qiov, 0);
if (ret < 0) {
goto fail;
}
goto success;
+ } else if (out_len < 0) {
+ ret = -EINVAL;
+ goto fail;
}
qemu_co_mutex_lock(&s->lock);