fs/9p/vfs_dentry.c

   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 as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to:
  21  *  Free Software Foundation
  22  *  51 Franklin Street, Fifth Floor
  23  *  Boston, MA  02111-1301  USA
  24  *
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/errno.h>
  29 #include <linux/fs.h>
  30 #include <linux/file.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/stat.h>
  33 #include <linux/string.h>
  34 #include <linux/smp_lock.h>
  35 #include <linux/inet.h>
  36 #include <linux/namei.h>
  37 #include <linux/idr.h>
  38
  39 #include "debug.h"
  40 #include "v9fs.h"
  41 #include "9p.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
  54 int v9fs_dentry_delete(struct dentry *dentry)
  55 {
  56         dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
  57         return 1;
  58 }
  59
  60 /**
  61  * v9fs_dentry_release - called when dentry is going to be freed
  62  * @dentry:  dentry that is being release
  63  *
  64  */
  65
  66 void v9fs_dentry_release(struct dentry *dentry)
  67 {
  68         int err;
  69
  70         dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
  71
  72         if (dentry->d_fsdata != NULL) {
  73                 struct list_head *fid_list = dentry->d_fsdata;
  74                 struct v9fs_fid *temp = NULL;
  75                 struct v9fs_fid *current_fid = NULL;
  76
  77                 list_for_each_entry_safe(current_fid, temp, fid_list, list) {
  78                         err = v9fs_t_clunk(current_fid->v9ses, current_fid->fid);
  79
  80                         if (err < 0)
  81                                 dprintk(DEBUG_ERROR, "clunk failed: %d name %s\n",
  82                                         err, dentry->d_iname);
  83
  84                         v9fs_fid_destroy(current_fid);
  85                 }
  86
  87                 kfree(dentry->d_fsdata);        /* free the list_head */
  88         }
  89 }
  90
  91 struct dentry_operations v9fs_dentry_operations = {
  92         .d_delete = v9fs_dentry_delete,
  93         .d_release = v9fs_dentry_release,
  94 };