Whamcloud - gitweb
- ext2_obd.c --- fix the bugs in read/write for Linux 2.4.3
[fs/lustre-release.git] / lustre / obdclass / class_obd.c
index 68fa910..d29ed08 100644 (file)
@@ -23,6 +23,7 @@
  *              Copyright (c) 1999 Stelias Computing, Inc.
  *                (authors {pschwan,braam}@stelias.com)
  *              Copyright (C) 1999 Seagate Technology, Inc.
+ *              Copyright (C) 2001 Cluster File Systems, Inc.
  *
  * 
  */
@@ -115,8 +116,11 @@ static int obd_class_release(struct inode * inode, struct file * file)
         return 0;
 }
 
-/* support function */
-static struct obd_type *obd_nm_to_type(char *nm) 
+/* 
+ * support functions: we could use inter-module communication, but this 
+ * is more portable to other OS's
+ */
+static struct obd_type *obd_search_type(char *nm)
 {
         struct list_head *tmp;
         struct obd_type *type;
@@ -131,7 +135,24 @@ static struct obd_type *obd_nm_to_type(char *nm)
                         return type;
                 }
         }
-        return NULL;
+       return NULL;
+}
+
+static struct obd_type *obd_nm_to_type(char *nm) 
+{
+        struct obd_type *type = obd_search_type(nm);
+
+#ifdef CONFIG_KMOD
+       if ( !type ) {
+               if ( !request_module(nm) ) {
+                       CDEBUG(D_PSDEV, "Loaded module '%s'\n", nm);
+                       type = obd_search_type(nm);
+               } else {
+                       CDEBUG(D_PSDEV, "Can't load module '%s'\n", nm);
+               }
+       }
+#endif
+        return type;
 }
 
 
@@ -163,18 +184,23 @@ static int getdata(int len, void **data)
 
 static int obd_devicename_from_path(obd_devicename* whoami, 
                                    uint32_t klen,
-                                   char* kname)
+                                   char* kname, char *user_path)
 {
+       int err;
+       struct nameidata nd;
        whoami->len = klen;
        whoami->name = kname;
 
-/*     err = user_path_walk(user_string, &nd); */
-/*     if (!err) {  */
-/*             whoami->dentry = nd.dentry; */
-/*             path_release(&nd); */
-/*     } */
-/*     return err; */
+#if (LINUX_VERSION_CODE <=  0x20403)
 
+       err = user_path_walk(user_path, &nd);
+       if (!err) {
+               CDEBUG(D_INFO, "found dentry for %s\n", kname);
+               whoami->dentry = nd.dentry;
+               path_release(&nd);
+       }
+       return err;
+#endif 
        return 0;
 }
 
@@ -238,16 +264,6 @@ static int obd_class_ioctl (struct inode * inode, struct file * filp,
                 /* find the type */
                 nm = input->att_type;
                 type = obd_nm_to_type(nm);
-#ifdef CONFIG_KMOD
-                if ( !type ) {
-                        if ( !request_module(nm) ) {
-                                CDEBUG(D_PSDEV, "Loaded module '%s'\n", nm);
-                                type = obd_nm_to_type(nm);
-                        } else {
-                                CDEBUG(D_PSDEV, "Can't load module '%s'\n", nm);
-                        }
-                }
-#endif
 
                 OBD_FREE(input->att_type, input->att_typelen + 1);
                 if ( !type ) {
@@ -339,6 +355,7 @@ static int obd_class_ioctl (struct inode * inode, struct file * filp,
                         int setup_datalen;
                         void *setup_data;
                 } *setup;
+               char *user_path;
 
                 setup = tmp_buf;
 
@@ -367,7 +384,8 @@ static int obd_class_ioctl (struct inode * inode, struct file * filp,
                  EXIT;
                  return err;
                }
-               
+               user_path = setup->setup_data;
+
                 /* get the attach data */
                 err = getdata(setup->setup_datalen, &setup->setup_data);
                 if ( err ) {
@@ -377,7 +395,8 @@ static int obd_class_ioctl (struct inode * inode, struct file * filp,
 
                err = obd_devicename_from_path(&(obddev->obd_fsname),
                                               setup->setup_datalen,
-                                              (char*) setup->setup_data);
+                                              (char*) setup->setup_data, 
+                                              user_path);
                if (err) {
                  memset(&(obddev->obd_fsname), 0, sizeof(obd_devicename));
                  EXIT;