Changeset 0ee4322 in mainline for uspace/srv/fs/tmpfs/tmpfs_ops.c

Timestamp:

2008-01-13T13:19:37Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

d0dc74ae

Parents:

4fb6bf36

Message:

Add ftruncate() and support for VFS_TRUNCATE to VFS and TMPFS.

File:

• uspace/srv/fs/tmpfs/tmpfs_ops.c (modified) (2 diffs)

uspace/srv/fs/tmpfs/tmpfs_ops.c

@@ -369 +369 @@
                 return;
         }
-        /* Clear any newly allocated memory in order to emulate gaps.  */
+        /* Clear any newly allocated memory in order to emulate gaps. */
         memset(newdata + dentry->size, 0, delta);
         dentry->size += delta;
@@ -377 +377 @@
 }
 
+void tmpfs_truncate(ipc_callid_t rid, ipc_call_t *request)
+{
+        int dev_handle = IPC_GET_ARG1(*request);
+        unsigned long index = IPC_GET_ARG2(*request);
+        size_t size = IPC_GET_ARG3(*request);
+
+        /*
+         * Lookup the respective dentry.
+         */
+        link_t *hlp;
+        hlp = hash_table_find(&dentries, &index);
+        if (!hlp) {
+                ipc_answer_0(rid, ENOENT);
+                return;
+        }
+        tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t,
+            dh_link);
+
+        if (size == dentry->size) {
+                ipc_answer_0(rid, EOK);
+                return;
+        }
+
+        void *newdata = realloc(dentry->data, size);
+        if (!newdata) {
+                ipc_answer_0(rid, ENOMEM);
+                return;
+        }
+        if (size > dentry->size) {
+                size_t delta = size - dentry->size;
+                memset(newdata + dentry->size, 0, delta);
+        }
+        dentry->size = size;
+        dentry->data = newdata;
+        ipc_answer_0(rid, EOK);
+}
+
 /**
  * @}