Changeset 7fe1f75 in mainline

Timestamp:

2008-02-28T21:30:50Z (16 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

ee68e4bc

Parents:

2c448fb

Message:

Support for O_TRUNC.

File:

• uspace/srv/vfs/vfs_ops.c (modified) (6 diffs)

uspace/srv/vfs/vfs_ops.c

@@ -52 +52 @@
 #include <atomic.h>
 #include "vfs.h"
+
+/* Forward declarations of static functions. */
+static int vfs_truncate_internal(int, int, unsigned long, size_t);
 
 /**
@@ -350 +353 @@
         }
 
-        /** Path is no longer needed. */
+        /* Path is no longer needed. */
         free(path);
 
@@ -358 +361 @@
         else
                 rwlock_read_unlock(&namespace_rwlock);
+
+        /* Truncate the file if requested and if necessary. */
+        if (oflag & O_TRUNC) {
+                futex_down(&node->contents_rwlock);
+                if (node->size) {
+                        rc = vfs_truncate_internal(node->fs_handle,
+                            node->dev_handle, node->index, 0);
+                        if (rc) {
+                                futex_up(&node->contents_rwlock);
+                                vfs_node_put(node);
+                                ipc_answer_0(rid, rc);
+                                return;
+                        }
+                        node->size = 0;
+                }
+                futex_up(&node->contents_rwlock);
+        }
 
         /*
@@ -561 +581 @@
 }
 
+int vfs_truncate_internal(int fs_handle, int dev_handle, unsigned long index,
+    size_t size)
+{
+        ipcarg_t rc;
+        int fs_phone;
+        
+        fs_phone = vfs_grab_phone(fs_handle);
+        rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle,
+            (ipcarg_t)index, (ipcarg_t)size);
+        vfs_release_phone(fs_phone);
+        return (int)rc;
+}
+
 void vfs_truncate(ipc_callid_t rid, ipc_call_t *request)
 {
         int fd = IPC_GET_ARG1(*request);
         size_t size = IPC_GET_ARG2(*request);
-        ipcarg_t rc;
+        int rc;
 
         vfs_file_t *file = vfs_file_get(fd);
@@ -575 +608 @@
 
         rwlock_write_lock(&file->node->contents_rwlock);
-        int fs_phone = vfs_grab_phone(file->node->fs_handle);
-        rc = async_req_3_0(fs_phone, VFS_TRUNCATE,
-            (ipcarg_t)file->node->dev_handle, (ipcarg_t)file->node->index,
-            (ipcarg_t)size);
-        vfs_release_phone(fs_phone);
+        rc = vfs_truncate_internal(file->node->fs_handle,
+            file->node->dev_handle, file->node->index, size);
         if (rc == EOK)
                 file->node->size = size;
@@ -585 +615 @@
 
         futex_up(&file->lock);
-        ipc_answer_0(rid, rc);
+        ipc_answer_0(rid, (ipcarg_t)rc);
 }