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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
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 version 2.
8 */
9
10#include <linux/spinlock.h>
11#include <linux/completion.h>
12#include <linux/buffer_head.h>
13#include <linux/gfs2_ondisk.h>
14#include <linux/namei.h>
15#include <linux/crc32.h>
16
17#include "gfs2.h"
18#include "incore.h"
19#include "dir.h"
20#include "glock.h"
21#include "super.h"
22#include "util.h"
23#include "inode.h"
24
25/**
26 * gfs2_drevalidate - Check directory lookup consistency
27 * @dentry: the mapping to check
28 * @nd:
29 *
30 * Check to make sure the lookup necessary to arrive at this inode from its
31 * parent is still good.
32 *
33 * Returns: 1 if the dentry is ok, 0 if it isn't
34 */
35
36static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd)
37{
38 struct dentry *parent;
39 struct gfs2_sbd *sdp;
40 struct gfs2_inode *dip;
41 struct inode *inode;
42 struct gfs2_holder d_gh;
43 struct gfs2_inode *ip = NULL;
44 int error;
45 int had_lock = 0;
46
47 if (nd && nd->flags & LOOKUP_RCU)
48 return -ECHILD;
49
50 parent = dget_parent(dentry);
51 sdp = GFS2_SB(parent->d_inode);
52 dip = GFS2_I(parent->d_inode);
53 inode = dentry->d_inode;
54
55 if (inode) {
56 if (is_bad_inode(inode))
57 goto invalid;
58 ip = GFS2_I(inode);
59 }
60
61 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
62 goto valid;
63
64 had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
65 if (!had_lock) {
66 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
67 if (error)
68 goto fail;
69 }
70
71 error = gfs2_dir_check(parent->d_inode, &dentry->d_name, ip);
72 switch (error) {
73 case 0:
74 if (!inode)
75 goto invalid_gunlock;
76 break;
77 case -ENOENT:
78 if (!inode)
79 goto valid_gunlock;
80 goto invalid_gunlock;
81 default:
82 goto fail_gunlock;
83 }
84
85valid_gunlock:
86 if (!had_lock)
87 gfs2_glock_dq_uninit(&d_gh);
88valid:
89 dput(parent);
90 return 1;
91
92invalid_gunlock:
93 if (!had_lock)
94 gfs2_glock_dq_uninit(&d_gh);
95invalid:
96 if (inode && S_ISDIR(inode->i_mode)) {
97 if (have_submounts(dentry))
98 goto valid;
99 shrink_dcache_parent(dentry);
100 }
101 d_drop(dentry);
102 dput(parent);
103 return 0;
104
105fail_gunlock:
106 gfs2_glock_dq_uninit(&d_gh);
107fail:
108 dput(parent);
109 return 0;
110}
111
112static int gfs2_dhash(const struct dentry *dentry, const struct inode *inode,
113 struct qstr *str)
114{
115 str->hash = gfs2_disk_hash(str->name, str->len);
116 return 0;
117}
118
119static int gfs2_dentry_delete(const struct dentry *dentry)
120{
121 struct gfs2_inode *ginode;
122
123 if (!dentry->d_inode)
124 return 0;
125
126 ginode = GFS2_I(dentry->d_inode);
127 if (!ginode->i_iopen_gh.gh_gl)
128 return 0;
129
130 if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))
131 return 1;
132
133 return 0;
134}
135
136const struct dentry_operations gfs2_dops = {
137 .d_revalidate = gfs2_drevalidate,
138 .d_hash = gfs2_dhash,
139 .d_delete = gfs2_dentry_delete,
140};
141
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
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 version 2.
8 */
9
10#include <linux/spinlock.h>
11#include <linux/completion.h>
12#include <linux/buffer_head.h>
13#include <linux/gfs2_ondisk.h>
14#include <linux/namei.h>
15#include <linux/crc32.h>
16
17#include "gfs2.h"
18#include "incore.h"
19#include "dir.h"
20#include "glock.h"
21#include "super.h"
22#include "util.h"
23#include "inode.h"
24
25/**
26 * gfs2_drevalidate - Check directory lookup consistency
27 * @dentry: the mapping to check
28 * @flags: lookup flags
29 *
30 * Check to make sure the lookup necessary to arrive at this inode from its
31 * parent is still good.
32 *
33 * Returns: 1 if the dentry is ok, 0 if it isn't
34 */
35
36static int gfs2_drevalidate(struct dentry *dentry, unsigned int flags)
37{
38 struct dentry *parent;
39 struct gfs2_sbd *sdp;
40 struct gfs2_inode *dip;
41 struct inode *inode;
42 struct gfs2_holder d_gh;
43 struct gfs2_inode *ip = NULL;
44 int error;
45 int had_lock = 0;
46
47 if (flags & LOOKUP_RCU)
48 return -ECHILD;
49
50 parent = dget_parent(dentry);
51 sdp = GFS2_SB(d_inode(parent));
52 dip = GFS2_I(d_inode(parent));
53 inode = d_inode(dentry);
54
55 if (inode) {
56 if (is_bad_inode(inode))
57 goto invalid;
58 ip = GFS2_I(inode);
59 }
60
61 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
62 goto valid;
63
64 had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
65 if (!had_lock) {
66 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
67 if (error)
68 goto fail;
69 }
70
71 error = gfs2_dir_check(d_inode(parent), &dentry->d_name, ip);
72 switch (error) {
73 case 0:
74 if (!inode)
75 goto invalid_gunlock;
76 break;
77 case -ENOENT:
78 if (!inode)
79 goto valid_gunlock;
80 goto invalid_gunlock;
81 default:
82 goto fail_gunlock;
83 }
84
85valid_gunlock:
86 if (!had_lock)
87 gfs2_glock_dq_uninit(&d_gh);
88valid:
89 dput(parent);
90 return 1;
91
92invalid_gunlock:
93 if (!had_lock)
94 gfs2_glock_dq_uninit(&d_gh);
95invalid:
96 dput(parent);
97 return 0;
98
99fail_gunlock:
100 gfs2_glock_dq_uninit(&d_gh);
101fail:
102 dput(parent);
103 return 0;
104}
105
106static int gfs2_dhash(const struct dentry *dentry, struct qstr *str)
107{
108 str->hash = gfs2_disk_hash(str->name, str->len);
109 return 0;
110}
111
112static int gfs2_dentry_delete(const struct dentry *dentry)
113{
114 struct gfs2_inode *ginode;
115
116 if (d_really_is_negative(dentry))
117 return 0;
118
119 ginode = GFS2_I(d_inode(dentry));
120 if (!gfs2_holder_initialized(&ginode->i_iopen_gh))
121 return 0;
122
123 if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))
124 return 1;
125
126 return 0;
127}
128
129const struct dentry_operations gfs2_dops = {
130 .d_revalidate = gfs2_drevalidate,
131 .d_hash = gfs2_dhash,
132 .d_delete = gfs2_dentry_delete,
133};
134