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 54 static 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 71 static 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 89 static 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 } 107 108 const struct dentry_operations v9fs_cached_dentry_operations = { 109 .d_delete = v9fs_cached_dentry_delete, 110 .d_release = v9fs_dentry_release, 111 }; 112 113 const struct dentry_operations v9fs_dentry_operations = { 114 .d_delete = v9fs_dentry_delete, 115 .d_release = v9fs_dentry_release, 116 }; 117