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Thomas Gleixner1f327612019-05-28 09:57:16 -07001// SPDX-License-Identifier: GPL-2.0-only
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -07002/*
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -07003 * This file contians vfs dentry ops for the 9P2000 protocol.
4 *
5 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -07007 */
8
9#include <linux/module.h>
10#include <linux/errno.h>
11#include <linux/fs.h>
12#include <linux/file.h>
13#include <linux/pagemap.h>
14#include <linux/stat.h>
15#include <linux/string.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070016#include <linux/inet.h>
17#include <linux/namei.h>
18#include <linux/idr.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040019#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050021#include <net/9p/9p.h>
22#include <net/9p/client.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070023
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070024#include "v9fs.h"
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070025#include "v9fs_vfs.h"
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070026#include "fid.h"
27
28/**
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060029 * v9fs_cached_dentry_delete - called when dentry refcount equals 0
30 * @dentry: dentry in question
31 *
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060032 */
Nick Pigginfe15ce42011-01-07 17:49:23 +110033static int v9fs_cached_dentry_delete(const struct dentry *dentry)
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060034{
Al Viro4b8e9922014-08-19 20:17:38 -040035 p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
36 dentry, dentry);
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060037
Aneesh Kumar K.Va950a652011-02-28 17:03:58 +053038 /* Don't cache negative dentries */
David Howells2b0143b2015-03-17 22:25:59 +000039 if (d_really_is_negative(dentry))
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060040 return 1;
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060041 return 0;
42}
43
44/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070045 * v9fs_dentry_release - called when dentry is going to be freed
46 * @dentry: dentry that is being release
47 *
48 */
49
Al Viro98cd3fb2011-01-12 17:10:55 -050050static void v9fs_dentry_release(struct dentry *dentry)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070051{
Al Viroaaeb7ecf2013-02-28 01:13:19 -050052 struct hlist_node *p, *n;
Dominique Martinet6e195b02021-11-02 22:16:43 +090053
Al Viro4b8e9922014-08-19 20:17:38 -040054 p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p)\n",
55 dentry, dentry);
Al Viroaaeb7ecf2013-02-28 01:13:19 -050056 hlist_for_each_safe(p, n, (struct hlist_head *)&dentry->d_fsdata)
Dominique Martinetb48dbb92022-06-12 13:42:32 +090057 p9_fid_put(hlist_entry(p, struct p9_fid, dlist));
Al Viroaaeb7ecf2013-02-28 01:13:19 -050058 dentry->d_fsdata = NULL;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070059}
60
Al Viro0b728e12012-06-10 16:03:43 -040061static int v9fs_lookup_revalidate(struct dentry *dentry, unsigned int flags)
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +053062{
63 struct p9_fid *fid;
64 struct inode *inode;
65 struct v9fs_inode *v9inode;
66
Al Viro0b728e12012-06-10 16:03:43 -040067 if (flags & LOOKUP_RCU)
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +053068 return -ECHILD;
69
David Howells2b0143b2015-03-17 22:25:59 +000070 inode = d_inode(dentry);
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +053071 if (!inode)
72 goto out_valid;
73
74 v9inode = V9FS_I(inode);
75 if (v9inode->cache_validity & V9FS_INO_INVALID_ATTR) {
76 int retval;
77 struct v9fs_session_info *v9ses;
Dominique Martinet6e195b02021-11-02 22:16:43 +090078
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +053079 fid = v9fs_fid_lookup(dentry);
80 if (IS_ERR(fid))
81 return PTR_ERR(fid);
82
83 v9ses = v9fs_inode2v9ses(inode);
84 if (v9fs_proto_dotl(v9ses))
85 retval = v9fs_refresh_inode_dotl(fid, inode);
86 else
87 retval = v9fs_refresh_inode(fid, inode);
Dominique Martinetb48dbb92022-06-12 13:42:32 +090088 p9_fid_put(fid);
Jianyong Wu6636b6d2020-09-23 22:11:46 +080089
Aneesh Kumar K.Vf2eda2c2011-03-23 19:48:16 +053090 if (retval == -ENOENT)
91 return 0;
92 if (retval < 0)
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +053093 return retval;
94 }
95out_valid:
96 return 1;
97}
98
Al Viroa488257c2009-02-20 05:55:46 +000099const struct dentry_operations v9fs_cached_dentry_operations = {
Aneesh Kumar K.Vb3cbea02011-02-28 17:04:06 +0530100 .d_revalidate = v9fs_lookup_revalidate,
Jeff Laytonecf3d1f2013-02-20 11:19:05 -0500101 .d_weak_revalidate = v9fs_lookup_revalidate,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600102 .d_delete = v9fs_cached_dentry_delete,
103 .d_release = v9fs_dentry_release,
104};
105
Al Viroa488257c2009-02-20 05:55:46 +0000106const struct dentry_operations v9fs_dentry_operations = {
Al Virob26d4cd2013-10-25 18:47:37 -0400107 .d_delete = always_delete_dentry,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700108 .d_release = v9fs_dentry_release,
109};