WebSVN – HelenOS – Diff – /trunk/uspace/srv/fs/fat/fat_ops.c

          * This is the more difficult case. We must allocate new
          * clusters for the node and zero them out.
          */
         int status;
         unsigned nclsts;
         fat_cluster_t mcl, lcl;
         nclsts = (ROUND_UP(pos + bytes, bps * spc) - boundary) /
             bps * spc;
         /* create an independent chain of nclsts clusters in all FATs */
         status = fat_alloc_clusters(bs, dev_handle, nclsts, &mcl,
             &lcl);
             ipc_answer_0(rid, status);
             return;
+        }
         /* zero fill any gaps */
         fat_fill_gap(bs, nodep, mcl, pos);
-        b = _fat_block_get(bs, dev_handle, lcl,
+        b = _fat_block_get(bs, dev_handle, lcl, (pos / bps) % spc);
-            (pos / bps) % spc);
         (void) ipc_data_write_finalize(callid, b->data + pos % bps,
             bytes);
         b->dirty = true;        /* need to sync block */
         block_put(b);
         /*
+    }
+}
 void fat_truncate(ipc_callid_t rid, ipc_call_t *request)
+{
+    dev_handle_t dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);
+    fs_index_t index = (fs_index_t)IPC_GET_ARG2(*request);
+    size_t size = (off_t)IPC_GET_ARG3(*request);
+    fat_node_t *nodep = (fat_node_t *)fat_node_get(dev_handle, index);
+    int rc;
+    if (!nodep) {
-    ipc_answer_0(rid, ENOTSUP);
+        ipc_answer_0(rid, ENOENT);
+        return;
+    }
+    if (nodep->size == size) {
+        rc = EOK;
+    } else if (nodep->size < size) {
+        /*
+         * TODO: the standard says we have the freedom to grow the file.
+         * For now, we simply return an error.
+         */
+        rc = EINVAL;
+    } else {
+        /*
+         * The file is to be shrunk.
+         */
+        rc = ENOTSUP;   /* XXX */
+    }
+    fat_node_put(nodep);
+    ipc_answer_0(rid, rc);
+    return;
+}
 /**
  * @}
  */

Subversion Repositories HelenOS

(root)/trunk/uspace/srv/fs/fat/fat_ops.c @ 4680 – Rev 3547 → 3548