blob: fd55979ec428106e2da3d2ff0f1db6ff46edfb73 [file] [log] [blame]
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
7 * of the GNU General Public License v.2.
8 */
9
10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/smp_lock.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050016#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050017#include <linux/crc32.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000018
19#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050020#include "lm_interface.h"
21#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000022#include "dir.h"
23#include "glock.h"
24#include "ops_dentry.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050025#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000026
27/**
28 * gfs2_drevalidate - Check directory lookup consistency
29 * @dentry: the mapping to check
30 * @nd:
31 *
32 * Check to make sure the lookup necessary to arrive at this inode from its
33 * parent is still good.
34 *
35 * Returns: 1 if the dentry is ok, 0 if it isn't
36 */
37
38static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd)
39{
40 struct dentry *parent = dget_parent(dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040041 struct gfs2_sbd *sdp = GFS2_SB(parent->d_inode);
42 struct gfs2_inode *dip = GFS2_I(parent->d_inode);
Steven Whitehousec7526662006-03-20 12:30:04 -050043 struct inode *inode = dentry->d_inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +000044 struct gfs2_holder d_gh;
45 struct gfs2_inode *ip;
46 struct gfs2_inum inum;
47 unsigned int type;
48 int error;
49
David Teiglandb3b94fa2006-01-16 16:50:04 +000050 if (inode && is_bad_inode(inode))
51 goto invalid;
52
Steven Whitehousec7526662006-03-20 12:30:04 -050053 if (sdp->sd_args.ar_localcaching)
54 goto valid;
55
David Teiglandb3b94fa2006-01-16 16:50:04 +000056 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
57 if (error)
58 goto fail;
59
Steven Whitehousec7526662006-03-20 12:30:04 -050060 error = gfs2_dir_search(parent->d_inode, &dentry->d_name, &inum, &type);
David Teiglandb3b94fa2006-01-16 16:50:04 +000061 switch (error) {
62 case 0:
63 if (!inode)
64 goto invalid_gunlock;
65 break;
66 case -ENOENT:
67 if (!inode)
68 goto valid_gunlock;
69 goto invalid_gunlock;
70 default:
71 goto fail_gunlock;
72 }
73
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040074 ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +000075
76 if (!gfs2_inum_equal(&ip->i_num, &inum))
77 goto invalid_gunlock;
78
79 if (IF2DT(ip->i_di.di_mode) != type) {
80 gfs2_consist_inode(dip);
81 goto fail_gunlock;
82 }
83
84 valid_gunlock:
85 gfs2_glock_dq_uninit(&d_gh);
86
87 valid:
David Teiglandb3b94fa2006-01-16 16:50:04 +000088 dput(parent);
89 return 1;
90
91 invalid_gunlock:
92 gfs2_glock_dq_uninit(&d_gh);
93
94 invalid:
95 if (inode && S_ISDIR(inode->i_mode)) {
96 if (have_submounts(dentry))
97 goto valid;
98 shrink_dcache_parent(dentry);
99 }
100 d_drop(dentry);
101
David Teiglandb3b94fa2006-01-16 16:50:04 +0000102 dput(parent);
103 return 0;
104
105 fail_gunlock:
106 gfs2_glock_dq_uninit(&d_gh);
107
108 fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000109 dput(parent);
110 return 0;
111}
112
Steven Whitehousec7526662006-03-20 12:30:04 -0500113static int gfs2_dhash(struct dentry *dentry, struct qstr *str)
114{
115 str->hash = gfs2_disk_hash(str->name, str->len);
116 return 0;
117}
118
David Teiglandb3b94fa2006-01-16 16:50:04 +0000119struct dentry_operations gfs2_dops = {
120 .d_revalidate = gfs2_drevalidate,
Steven Whitehousec7526662006-03-20 12:30:04 -0500121 .d_hash = gfs2_dhash,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000122};
123