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 <net/9p/9p.h> 38 #include <net/9p/client.h> 39 40 #include "v9fs.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 53 static int v9fs_dentry_delete(struct dentry *dentry) 54 { 55 P9_DPRINTK(P9_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 69 static int v9fs_cached_dentry_delete(struct dentry *dentry) 70 { 71 struct inode *inode = dentry->d_inode; 72 P9_DPRINTK(P9_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 86 void v9fs_dentry_release(struct dentry *dentry) 87 { 88 struct v9fs_dentry *dent; 89 struct p9_fid *temp, *current_fid; 90 91 P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 92 dent = dentry->d_fsdata; 93 if (dent) { 94 list_for_each_entry_safe(current_fid, temp, &dent->fidlist, 95 dlist) { 96 p9_client_clunk(current_fid); 97 } 98 99 kfree(dent); 100 dentry->d_fsdata = NULL; 101 } 102 } 103 104 struct dentry_operations v9fs_cached_dentry_operations = { 105 .d_delete = v9fs_cached_dentry_delete, 106 .d_release = v9fs_dentry_release, 107 }; 108 109 struct dentry_operations v9fs_dentry_operations = { 110 .d_delete = v9fs_dentry_delete, 111 .d_release = v9fs_dentry_release, 112 }; 113