virtiofsd: get rid of in_sg_left variable

in_sg_left seems to be being used primarly for debugging purpose. It is
keeping track of how many bytes are left in the scatter list we are
reading into.

We already have another variable "len" which keeps track how many bytes
are left to be read. And in_sg_left is greater than or equal to len. We
have already ensured that in the beginning of function.

    if (in_len < tosend_len) {
        fuse_log(FUSE_LOG_ERR, "%s: elem %d too small for data len %zd\n",
                 __func__, elem->index, tosend_len);
        ret = E2BIG;
        goto err;
    }

So in_sg_left seems like a redundant variable. It probably was useful for
debugging when code was being developed. Get rid of it. It helps simplify
this function.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Connor Kuehl <ckuehl@redhat.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Message-Id: <20210518213538.693422-5-vgoyal@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

tools/virtiofsd/fuse_virtio.c

@@ -394,20 +394,16 @@ int virtio_send_data_iov(struct fuse_session *se, struct fuse_chan *ch,
     /* skip over parts of in_sg that contained the header iov */
     size_t skip_size = iov_len;
 
-    size_t in_sg_left = 0;
     do {
         if (skip_size != 0) {
             iov_discard_front(&in_sg_ptr, &in_sg_cpy_count, skip_size);
         }
 
-        int i;
-        for (i = 0, in_sg_left = 0; i < in_sg_cpy_count; i++) {
-            in_sg_left += in_sg_ptr[i].iov_len;
-        }
         fuse_log(FUSE_LOG_DEBUG,
                  "%s: after skip skip_size=%zd in_sg_cpy_count=%d "
-                 "in_sg_left=%zd\n",
-                 __func__, skip_size, in_sg_cpy_count, in_sg_left);
+                 "len remaining=%zd\n", __func__, skip_size, in_sg_cpy_count,
+                 len);
+
         ret = preadv(buf->buf[0].fd, in_sg_ptr, in_sg_cpy_count,
                      buf->buf[0].pos);
 
@@ -434,13 +430,12 @@ int virtio_send_data_iov(struct fuse_session *se, struct fuse_chan *ch,
         }
         if (!ret) {
             /* EOF case? */
-            fuse_log(FUSE_LOG_DEBUG, "%s: !ret in_sg_left=%zd\n", __func__,
-                     in_sg_left);
+            fuse_log(FUSE_LOG_DEBUG, "%s: !ret len remaining=%zd\n", __func__,
+                     len);
             break;
         }
-        in_sg_left -= ret;
         len -= ret;
-    } while (in_sg_left);
+    } while (len);
 
     /* Need to fix out->len on EOF */
     if (len) {