* 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 as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * 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
#include <linux/pagemap.h>
#include <linux/stat.h>
#include <linux/string.h>
-#include <linux/smp_lock.h>
#include <linux/inet.h>
#include <linux/namei.h>
#include <linux/idr.h>
+#include <linux/sched.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
-#include "debug.h"
#include "v9fs.h"
-#include "9p.h"
#include "v9fs_vfs.h"
-#include "conv.h"
#include "fid.h"
/**
- * v9fs_dentry_validate - VFS dcache hook to validate cache
- * @dentry: dentry that is being validated
- * @nd: path data
+ * v9fs_dentry_delete - called when dentry refcount equals 0
+ * @dentry: dentry in question
*
- * dcache really shouldn't be used for 9P2000 as at all due to
- * potential attached semantics to directory traversal (walk).
- *
- * FUTURE: look into how to use dcache to allow multi-stage
- * walks in Plan 9 & potential for better dcache operation which
- * would remain valid for Plan 9 semantics. Older versions
- * had validation via stat for those interested. However, since
- * stat has the same approximate overhead as walk there really
- * is no difference. The only improvement would be from a
- * time-decay cache like NFS has and that undermines the
- * synchronous nature of 9P2000.
+ * By returning 1 here we should remove cacheing of unused
+ * dentry components.
*
*/
-static int v9fs_dentry_validate(struct dentry *dentry, struct nameidata *nd)
+static int v9fs_dentry_delete(struct dentry *dentry)
{
- struct dentry *dc = current->fs->pwd;
+ P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
+ dentry);
- dprintk(DEBUG_VFS, "dentry: %s (%p)\n", dentry->d_iname, dentry);
- if (v9fs_fid_lookup(dentry, FID_OP)) {
- dprintk(DEBUG_VFS, "VALID\n");
- return 1;
- }
+ return 1;
+}
- while (dc != NULL) {
- if (dc == dentry) {
- dprintk(DEBUG_VFS, "VALID\n");
- return 1;
- }
- if (dc == dc->d_parent)
- break;
+/**
+ * v9fs_cached_dentry_delete - called when dentry refcount equals 0
+ * @dentry: dentry in question
+ *
+ * Only return 1 if our inode is invalid. Only non-synthetic files
+ * (ones without mtime == 0) should be calling this function.
+ *
+ */
- dc = dc->d_parent;
- }
+static int v9fs_cached_dentry_delete(struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+ P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
+ dentry);
+
+ if(!inode)
+ return 1;
- dprintk(DEBUG_VFS, "INVALID\n");
return 0;
}
void v9fs_dentry_release(struct dentry *dentry)
{
- dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
-
- if (dentry->d_fsdata != NULL) {
- struct list_head *fid_list = dentry->d_fsdata;
- struct v9fs_fid *temp = NULL;
- struct v9fs_fid *current_fid = NULL;
- struct v9fs_fcall *fcall = NULL;
-
- list_for_each_entry_safe(current_fid, temp, fid_list, list) {
- if (v9fs_t_clunk
- (current_fid->v9ses, current_fid->fid, &fcall))
- dprintk(DEBUG_ERROR, "clunk failed: %s\n",
- FCALL_ERROR(fcall));
-
- v9fs_put_idpool(current_fid->fid,
- ¤t_fid->v9ses->fidpool);
-
- kfree(fcall);
- v9fs_fid_destroy(current_fid);
+ struct v9fs_dentry *dent;
+ struct p9_fid *temp, *current_fid;
+
+ P9_DPRINTK(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(dentry->d_fsdata); /* free the list_head */
+ kfree(dent);
+ dentry->d_fsdata = NULL;
}
}
-struct dentry_operations v9fs_dentry_operations = {
- .d_revalidate = v9fs_dentry_validate,
+const struct dentry_operations v9fs_cached_dentry_operations = {
+ .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,
};