Changeset 8334a427 in mainline

Timestamp:

2008-11-04T23:13:20Z (15 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

4f1c0b4

Parents:

c472aff

Message:

More fat_truncate() bits.

File:

• uspace/srv/fs/fat/fat_ops.c (modified) (3 diffs)

uspace/srv/fs/fat/fat_ops.c

@@ -690 +690 @@
                 int status;
                 unsigned nclsts;
-                fat_cluster_t mcl, lcl;
-        
+                fat_cluster_t mcl, lcl; 
+ 
                 nclsts = (ROUND_UP(pos + bytes, bps * spc) - boundary) /
                     bps * spc;
@@ -706 +706 @@
                 /* zero fill any gaps */
                 fat_fill_gap(bs, nodep, mcl, pos);
-                b = _fat_block_get(bs, dev_handle, lcl,
-                    (pos / bps) % spc);
+                b = _fat_block_get(bs, dev_handle, lcl, (pos / bps) % spc);
                 (void) ipc_data_write_finalize(callid, b->data + pos % bps,
                     bytes);
@@ -727 +726 @@
 void fat_truncate(ipc_callid_t rid, ipc_call_t *request)
 {
-        ipc_answer_0(rid, ENOTSUP);
+        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, 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;
+
 }