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 38#include "debug.h" 39#include "v9fs.h" 40#include "9p.h" 41#include "v9fs_vfs.h" 42#include "fid.h" 43 44/** 45 * v9fs_dentry_delete - called when dentry refcount equals 0 46 * @dentry: dentry in question 47 * 48 * By returning 1 here we should remove cacheing of unused 49 * dentry components. 50 * 51 */ 52 53static int v9fs_dentry_delete(struct dentry *dentry) 54{ 55 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 56 57 return 1; 58} 59 60/** 61 * v9fs_cached_dentry_delete - called when dentry refcount equals 0 62 * @dentry: dentry in question 63 * 64 * Only return 1 if our inode is invalid. Only non-synthetic files 65 * (ones without mtime == 0) should be calling this function. 66 * 67 */ 68 69static int v9fs_cached_dentry_delete(struct dentry *dentry) 70{ 71 struct inode *inode = dentry->d_inode; 72 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 73 74 if(!inode) 75 return 1; 76 77 return 0; 78} 79 80/** 81 * v9fs_dentry_release - called when dentry is going to be freed 82 * @dentry: dentry that is being release 83 * 84 */ 85 86void v9fs_dentry_release(struct dentry *dentry) 87{ 88 int err; 89 90 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 91 92 if (dentry->d_fsdata != NULL) { 93 struct list_head *fid_list = dentry->d_fsdata; 94 struct v9fs_fid *temp = NULL; 95 struct v9fs_fid *current_fid = NULL; 96 97 list_for_each_entry_safe(current_fid, temp, fid_list, list) { 98 err = v9fs_t_clunk(current_fid->v9ses, current_fid->fid); 99 100 if (err < 0) 101 dprintk(DEBUG_ERROR, "clunk failed: %d name %s\n", 102 err, dentry->d_iname); 103 104 v9fs_fid_destroy(current_fid); 105 } 106 107 kfree(dentry->d_fsdata); /* free the list_head */ 108 } 109} 110 111struct dentry_operations v9fs_cached_dentry_operations = { 112 .d_delete = v9fs_cached_dentry_delete, 113 .d_release = v9fs_dentry_release, 114}; 115 116struct dentry_operations v9fs_dentry_operations = { 117 .d_delete = v9fs_dentry_delete, 118 .d_release = v9fs_dentry_release, 119}; 120