/* * linux/fs/9p/vfs_dentry.c * * This file contians vfs dentry ops for the 9P2000 protocol. * * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ #include <linux/module.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/file.h> #include <linux/pagemap.h> #include <linux/stat.h> #include <linux/string.h> #include <linux/inet.h> #include <linux/namei.h> #include <linux/idr.h> #include <linux/sched.h> #include <linux/slab.h> #include <net/9p/9p.h> #include <net/9p/client.h> #include "v9fs.h" #include "v9fs_vfs.h" #include "fid.h" /** * v9fs_cached_dentry_delete - called when dentry refcount equals 0 * @dentry: dentry in question * */ static int v9fs_cached_dentry_delete(const struct dentry *dentry) { p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n", dentry, dentry); /* Don't cache negative dentries */ if (d_really_is_negative(dentry)) return 1; return 0; } /** * v9fs_dentry_release - called when dentry is going to be freed * @dentry: dentry that is being release * */ static void v9fs_dentry_release(struct dentry *dentry) { struct hlist_node *p, *n; p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n", dentry, dentry); hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata) p9_client_clunk(hlist_entry(p, struct p9_fid, dlist)); dentry->d_fsdata = NULL; } static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags) { struct p9_fid *fid; struct inode *inode; struct v9fs_inode *v9inode; if (flags & LOOKUP_RCU) return -ECHILD; inode = d_inode(dentry); if (!inode) goto out_valid; v9inode = V9FS_I(inode); if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) { int retval; struct v9fs_session_info *v9ses; fid = v9fs_fid_lookup(dentry); if (IS_ERR(fid)) return PTR_ERR(fid); v9ses = v9fs_inode2v9ses(inode); if (v9fs_proto_dotl(v9ses)) retval = v9fs_refresh_inode_dotl(fid, inode); else retval = v9fs_refresh_inode(fid, inode); if (retval == -ENOENT) return 0; if (retval < 0) return retval; } out_valid: return 1; } const struct dentry_operations v9fs_cached_dentry_operations = { .d_revalidate = v9fs_lookup_revalidate, .d_weak_revalidate = v9fs_lookup_revalidate, .d_delete = v9fs_cached_dentry_delete, .d_release = v9fs_dentry_release, }; const struct dentry_operations v9fs_dentry_operations = { .d_delete = always_delete_dentry, .d_release = v9fs_dentry_release, };