Branch b1_4

[fs/lustre-release.git] / lustre / smfs / symlink.c

diff --git a/lustre/smfs/symlink.c b/lustre/smfs/symlink.c
index f590852..6daf3e3 100644 (file)
--- a/lustre/smfs/symlink.c
+++ b/lustre/smfs/symlink.c
@@ -1,62 +1,100 @@
-/*
- *  smfs/symlink.c
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
  *
+ *  lustre/smfs/symlink.c
+ *  Lustre filesystem abstraction routines
  *
+ *  Copyright (C) 2002, 2003 Cluster File Systems, Inc.
+ *
+ *   This file is part of Lustre, http://www.lustre.org.
+ *
+ *   Lustre is free software; you can redistribute it and/or
+ *   modify it under the terms of version 2 of the GNU General Public
+ *   License as published by the Free Software Foundation.
+ *
+ *   Lustre is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Lustre; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
-#define DEBUG_SUBSYSTEM S_SNAP
+
+#define DEBUG_SUBSYSTEM S_SM
 
 #include <linux/kmod.h>
 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/string.h>
+#include <linux/obd_class.h>
+#include <linux/obd_support.h>
+#include <linux/lustre_lib.h>
+#include <linux/lustre_idl.h>
+#include <linux/lustre_fsfilt.h>
+#include <linux/lustre_smfs.h>
 
-#include "smfs_internal.h" 
+#include "smfs_internal.h"
 
-static int smfs_readlink(struct dentry * dentry, char * buffer, int buflen)
+static int smfs_readlink(struct dentry *dentry, char *buffer, int buflen)
 {
-       struct inode *cache_inode = I2CI(dentry->d_inode);
-       struct dentry cache_dentry;
-       int    rc = 0;
-
-       if (!cache_inode)
-               RETURN(-ENOENT);
-       
-       smfs_prepare_dentry(&cache_dentry, NULL, &dentry->d_name);
-       d_add(&cache_dentry, cache_inode);
-               
-       if (cache_inode->i_op && cache_inode->i_op->readlink)   
-               rc = cache_inode->i_op->readlink(&cache_dentry, buffer, buflen);
-       
-       smfs_clear_dentry(&cache_dentry);
-       return rc;
+        struct inode *cache_inode = I2CI(dentry->d_inode);
+        struct dentry *cache_dentry;
+        int rc = -ENOMEM;
+        struct hook_symlink_msg msg = {
+                .dentry = dentry,
+        };
+        
+        ENTRY;
+
+        if (!cache_inode || !cache_inode->i_op->readlink)
+                RETURN(-ENOENT);
+        
+        cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
+        if (!cache_dentry) {
+                rc = -ENOMEM;
+                goto exit;
+        }
+
+        SMFS_PRE_HOOK(dentry->d_inode, HOOK_READLINK, &msg);
+        
+        rc = cache_inode->i_op->readlink(cache_dentry, buffer, buflen);
+
+        SMFS_POST_HOOK(dentry->d_inode, HOOK_READLINK, &msg, rc); 
+       
+exit:
+        post_smfs_dentry(cache_dentry);
+        RETURN(rc);
 }
 
 static int smfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
-       struct inode *cache_inode = I2CI(dentry->d_inode);
-       struct dentry cache_dentry;
-       int rc = 0;
-       if (!cache_inode)
-               RETURN(-ENOENT);
-       
-       smfs_prepare_dentry(&cache_dentry, NULL, &dentry->d_name);
-       d_add(&cache_dentry, cache_inode);
-
-       if (cache_inode->i_op && cache_inode->i_op->follow_link)        
-               rc = cache_inode->i_op->follow_link(&cache_dentry, nd);
-       
-       smfs_clear_dentry(&cache_dentry);
-       return rc;
+        struct inode *cache_inode = I2CI(dentry->d_inode);
+        struct dentry *cache_dentry;
+        int rc = -ENOMEM;
+        ENTRY;
+
+        if (!cache_inode || !cache_inode->i_op->follow_link)
+                RETURN(-ENOENT);
 
+        cache_dentry = pre_smfs_dentry(NULL, cache_inode, dentry);
+        if (cache_dentry)
+                rc = cache_inode->i_op->follow_link(cache_dentry, nd);
+
+        post_smfs_dentry(cache_dentry);
+        RETURN(rc);
 }
+
 struct inode_operations smfs_sym_iops = {
-       readlink:       smfs_readlink,
-       follow_link:    smfs_follow_link,
-       setxattr:       smfs_setxattr,          /* BKL held */
-        getxattr:       smfs_getxattr,          /* BKL held */
-        listxattr:      smfs_listxattr,         /* BKL held */
-        removexattr:    smfs_removexattr,       /* BKL held */
+        .readlink        = smfs_readlink,
+        .follow_link     = smfs_follow_link,
+        .setxattr        = smfs_setxattr,
+        .getxattr        = smfs_getxattr,
+        .listxattr       = smfs_listxattr,
+        .removexattr     = smfs_removexattr,
+        .permission      = smfs_permission,
 };
 
 struct file_operations smfs_sym_fops = {