LXR linux/fs/9p/vfs

   1/*
   2 *  linux/fs/9p/vfs_dentry.c
   3 *
   4 * This file contians vfs dentry ops for the 9P2000 protocol.
   5 *
   6 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   7 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License version 2
  11 *  as published by the Free Software Foundation.
  12 *
  13 *  This program is distributed in the hope that it will be useful,
  14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *  GNU General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License
  19 *  along with this program; if not, write to:
  20 *  Free Software Foundation
  21 *  51 Franklin Street, Fifth Floor
  22 *  Boston, MA  02111-1301  USA
  23 *
  24 */
  25
  26#include <linux/module.h>
  27#include <linux/errno.h>
  28#include <linux/fs.h>
  29#include <linux/file.h>
  30#include <linux/pagemap.h>
  31#include <linux/stat.h>
  32#include <linux/string.h>
  33#include <linux/inet.h>
  34#include <linux/namei.h>
  35#include <linux/idr.h>
  36#include <linux/sched.h>
  37#include <linux/slab.h>
  38#include <net/9p/9p.h>
  39#include <net/9p/client.h>
  40
  41#include "v9fs.h"
  42#include "v9fs_vfs.h"
  43#include "fid.h"
  44
  45/**
  46 * v9fs_dentry_delete - called when dentry refcount equals 0
  47 * @dentry:  dentry in question
  48 *
  49 * By returning 1 here we should remove cacheing of unused
  50 * dentry components.
  51 *
  52 */
  53
  54static int v9fs_dentry_delete(const struct dentry *dentry)
  55{
  56        P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
  57                                                                        dentry);
  58
  59        return 1;
  60}
  61
  62/**
  63 * v9fs_cached_dentry_delete - called when dentry refcount equals 0
  64 * @dentry:  dentry in question
  65 *
  66 * Only return 1 if our inode is invalid.  Only non-synthetic files
  67 * (ones without mtime == 0) should be calling this function.
  68 *
  69 */
  70
  71static int v9fs_cached_dentry_delete(const struct dentry *dentry)
  72{
  73        struct inode *inode = dentry->d_inode;
  74        P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
  75                                                                        dentry);
  76
  77        if(!inode)
  78                return 1;
  79
  80        return 0;
  81}
  82
  83/**
  84 * v9fs_dentry_release - called when dentry is going to be freed
  85 * @dentry:  dentry that is being release
  86 *
  87 */
  88
  89static void v9fs_dentry_release(struct dentry *dentry)
  90{
  91        struct v9fs_dentry *dent;
  92        struct p9_fid *temp, *current_fid;
  93
  94        P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
  95                                                                        dentry);
  96        dent = dentry->d_fsdata;
  97        if (dent) {
  98                list_for_each_entry_safe(current_fid, temp, &dent->fidlist,
  99                                                                        dlist) {
 100                        p9_client_clunk(current_fid);
 101                }
 102
 103                kfree(dent);
 104                dentry->d_fsdata = NULL;
 105        }
 106}
 107
 108const struct dentry_operations v9fs_cached_dentry_operations = {
 109        .d_delete = v9fs_cached_dentry_delete,
 110        .d_release = v9fs_dentry_release,
 111};
 112
 113const struct dentry_operations v9fs_dentry_operations = {
 114        .d_delete = v9fs_dentry_delete,
 115        .d_release = v9fs_dentry_release,
 116};
 117