- if (rpc_nfs_write_async(nfs->rpc, nfs_pwrite_cb, &nfsfh->fh, buf, offset, count, nfsfh->is_sync?FILE_SYNC:UNSTABLE, data) != 0) {
- rpc_set_error(nfs->rpc, "RPC error: Failed to send WRITE call for %s", data->path);
- data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
- free_nfs_cb_data(data);
- return -1;
+
+ if (count <= nfs_get_writemax(nfs)) {
+ if (rpc_nfs_write_async(nfs->rpc, nfs_pwrite_cb, &nfsfh->fh, buf, offset, count, nfsfh->is_sync?FILE_SYNC:UNSTABLE, data) != 0) {
+ rpc_set_error(nfs->rpc, "RPC error: Failed to send WRITE call for %s", data->path);
+ data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
+ free_nfs_cb_data(data);
+ return -1;
+ }
+ return 0;
+ }
+
+ /* trying to write more than maximum server write size, we has to chop it up into smaller
+ * chunks.
+ * we send all writes in parallell so that performance is still good.
+ */
+ data->max_offset = offset;
+ data->start_offset = offset;
+
+ while (count > 0) {
+ size_t writecount = count;
+ struct nfs_mcb_data *mdata;
+
+ if (writecount > nfs_get_writemax(nfs)) {
+ writecount = nfs_get_writemax(nfs);
+ }
+
+ mdata = malloc(sizeof(struct nfs_mcb_data));
+ if (mdata == NULL) {
+ rpc_set_error(nfs->rpc, "out of memory: failed to allocate nfs_mcb_data structure");
+ return -1;
+ }
+ memset(mdata, 0, sizeof(struct nfs_mcb_data));
+ mdata->data = data;
+ mdata->offset = offset;
+ mdata->count = writecount;
+
+ if (rpc_nfs_write_async(nfs->rpc, nfs_pwrite_mcb, &nfsfh->fh, &buf[offset - data->start_offset], offset, writecount, nfsfh->is_sync?FILE_SYNC:UNSTABLE, mdata) != 0) {
+ rpc_set_error(nfs->rpc, "RPC error: Failed to send WRITE call for %s", data->path);
+ data->cb(-ENOMEM, nfs, rpc_get_error(nfs->rpc), data->private_data);
+ free(mdata);
+ return -1;
+ }
+
+ count -= writecount;
+ offset += writecount;
+ data->num_calls++;