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