zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/9p/vfs_dentry.c b/ap/os/linux/linux-3.4.x/fs/9p/vfs_dentry.c
new file mode 100644
index 0000000..d529437
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/9p/vfs_dentry.c
@@ -0,0 +1,147 @@
+/*
+ * 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_dentry_delete - called when dentry refcount equals 0
+ * @dentry: dentry in question
+ *
+ * By returning 1 here we should remove cacheing of unused
+ * dentry components.
+ *
+ */
+
+static int v9fs_dentry_delete(const struct dentry *dentry)
+{
+ p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
+ dentry->d_name.name, dentry);
+
+ return 1;
+}
+
+/**
+ * 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: %s (%p)\n",
+ dentry->d_name.name, dentry);
+
+ /* Don't cache negative dentries */
+ if (!dentry->d_inode)
+ 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 v9fs_dentry *dent;
+ struct p9_fid *temp, *current_fid;
+
+ p9_debug(P9_DEBUG_VFS, " dentry: %s (%p)\n",
+ dentry->d_name.name, dentry);
+ dent = dentry->d_fsdata;
+ if (dent) {
+ list_for_each_entry_safe(current_fid, temp, &dent->fidlist,
+ dlist) {
+ p9_client_clunk(current_fid);
+ }
+
+ kfree(dent);
+ dentry->d_fsdata = NULL;
+ }
+}
+
+static int v9fs_lookup_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+ struct p9_fid *fid;
+ struct inode *inode;
+ struct v9fs_inode *v9inode;
+
+ if (nd->flags & LOOKUP_RCU)
+ return -ECHILD;
+
+ inode = dentry->d_inode;
+ 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_delete = v9fs_cached_dentry_delete,
+ .d_release = v9fs_dentry_release,
+};
+
+const struct dentry_operations v9fs_dentry_operations = {
+ .d_delete = v9fs_dentry_delete,
+ .d_release = v9fs_dentry_release,
+};