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David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
David Teiglandb3b94fa2006-01-16 16:50:04 +000010#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050014#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050015#include <linux/crc32.h>
Fabio Massimo Di Nitto7d308592006-09-19 07:56:29 +020016#include <linux/lm_interface.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000017
18#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050019#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000020#include "dir.h"
21#include "glock.h"
Steven Whitehouseb2760582008-10-14 16:05:55 +010022#include "super.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050023#include "util.h"
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010024#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000025
26/**
27 * gfs2_drevalidate - Check directory lookup consistency
28 * @dentry: the mapping to check
29 * @nd:
30 *
31 * Check to make sure the lookup necessary to arrive at this inode from its
32 * parent is still good.
33 *
34 * Returns: 1 if the dentry is ok, 0 if it isn't
35 */
36
37static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd)
38{
39 struct dentry *parent = dget_parent(dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040040 struct gfs2_sbd *sdp = GFS2_SB(parent->d_inode);
41 struct gfs2_inode *dip = GFS2_I(parent->d_inode);
Steven Whitehousec7526662006-03-20 12:30:04 -050042 struct inode *inode = dentry->d_inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +000043 struct gfs2_holder d_gh;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010044 struct gfs2_inode *ip = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +000045 int error;
Steven Whitehouse7afd88d2008-02-22 16:07:18 +000046 int had_lock = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +000047
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010048 if (inode) {
49 if (is_bad_inode(inode))
50 goto invalid;
51 ip = GFS2_I(inode);
52 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000053
Steven Whitehousec7526662006-03-20 12:30:04 -050054 if (sdp->sd_args.ar_localcaching)
55 goto valid;
56
Steven Whitehouse7afd88d2008-02-22 16:07:18 +000057 had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
Wendy Cheng549ae0a2007-02-06 03:52:16 -050058 if (!had_lock) {
59 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
60 if (error)
61 goto fail;
62 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000063
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010064 error = gfs2_dir_check(parent->d_inode, &dentry->d_name, ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +000065 switch (error) {
66 case 0:
67 if (!inode)
68 goto invalid_gunlock;
69 break;
70 case -ENOENT:
71 if (!inode)
72 goto valid_gunlock;
73 goto invalid_gunlock;
74 default:
75 goto fail_gunlock;
76 }
77
Steven Whitehousea91ea692006-09-04 12:04:26 -040078valid_gunlock:
Wendy Cheng549ae0a2007-02-06 03:52:16 -050079 if (!had_lock)
80 gfs2_glock_dq_uninit(&d_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -040081valid:
David Teiglandb3b94fa2006-01-16 16:50:04 +000082 dput(parent);
83 return 1;
84
Steven Whitehousea91ea692006-09-04 12:04:26 -040085invalid_gunlock:
Wendy Cheng549ae0a2007-02-06 03:52:16 -050086 if (!had_lock)
87 gfs2_glock_dq_uninit(&d_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -040088invalid:
David Teiglandb3b94fa2006-01-16 16:50:04 +000089 if (inode && S_ISDIR(inode->i_mode)) {
90 if (have_submounts(dentry))
91 goto valid;
92 shrink_dcache_parent(dentry);
93 }
94 d_drop(dentry);
David Teiglandb3b94fa2006-01-16 16:50:04 +000095 dput(parent);
96 return 0;
97
Steven Whitehousea91ea692006-09-04 12:04:26 -040098fail_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +000099 gfs2_glock_dq_uninit(&d_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400100fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000101 dput(parent);
102 return 0;
103}
104
Steven Whitehousec7526662006-03-20 12:30:04 -0500105static int gfs2_dhash(struct dentry *dentry, struct qstr *str)
106{
107 str->hash = gfs2_disk_hash(str->name, str->len);
108 return 0;
109}
110
David Teiglandb3b94fa2006-01-16 16:50:04 +0000111struct dentry_operations gfs2_dops = {
112 .d_revalidate = gfs2_drevalidate,
Steven Whitehousec7526662006-03-20 12:30:04 -0500113 .d_hash = gfs2_dhash,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000114};
115