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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2005 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 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> | |
5c676f6d | 16 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
17 | #include <asm/semaphore.h> |
18 | ||
19 | #include "gfs2.h" | |
5c676f6d SW |
20 | #include "lm_interface.h" |
21 | #include "incore.h" | |
b3b94faa DT |
22 | #include "dir.h" |
23 | #include "glock.h" | |
24 | #include "ops_dentry.h" | |
5c676f6d | 25 | #include "util.h" |
b3b94faa DT |
26 | |
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 | ||
38 | static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd) | |
39 | { | |
40 | struct dentry *parent = dget_parent(dentry); | |
5c676f6d | 41 | struct gfs2_inode *dip = parent->d_inode->u.generic_ip; |
b3b94faa DT |
42 | struct inode *inode; |
43 | struct gfs2_holder d_gh; | |
44 | struct gfs2_inode *ip; | |
45 | struct gfs2_inum inum; | |
46 | unsigned int type; | |
47 | int error; | |
48 | ||
49 | lock_kernel(); | |
50 | ||
b3b94faa DT |
51 | inode = dentry->d_inode; |
52 | if (inode && is_bad_inode(inode)) | |
53 | goto invalid; | |
54 | ||
55 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
56 | if (error) | |
57 | goto fail; | |
58 | ||
59 | error = gfs2_dir_search(dip, &dentry->d_name, &inum, &type); | |
60 | switch (error) { | |
61 | case 0: | |
62 | if (!inode) | |
63 | goto invalid_gunlock; | |
64 | break; | |
65 | case -ENOENT: | |
66 | if (!inode) | |
67 | goto valid_gunlock; | |
68 | goto invalid_gunlock; | |
69 | default: | |
70 | goto fail_gunlock; | |
71 | } | |
72 | ||
5c676f6d | 73 | ip = inode->u.generic_ip; |
b3b94faa DT |
74 | |
75 | if (!gfs2_inum_equal(&ip->i_num, &inum)) | |
76 | goto invalid_gunlock; | |
77 | ||
78 | if (IF2DT(ip->i_di.di_mode) != type) { | |
79 | gfs2_consist_inode(dip); | |
80 | goto fail_gunlock; | |
81 | } | |
82 | ||
83 | valid_gunlock: | |
84 | gfs2_glock_dq_uninit(&d_gh); | |
85 | ||
86 | valid: | |
87 | unlock_kernel(); | |
88 | 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 | ||
102 | unlock_kernel(); | |
103 | dput(parent); | |
104 | return 0; | |
105 | ||
106 | fail_gunlock: | |
107 | gfs2_glock_dq_uninit(&d_gh); | |
108 | ||
109 | fail: | |
110 | unlock_kernel(); | |
111 | dput(parent); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | struct dentry_operations gfs2_dops = { | |
116 | .d_revalidate = gfs2_drevalidate, | |
117 | }; | |
118 |