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Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
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> |
71b86f56 | 17 | #include <linux/crc32.h> |
b3b94faa DT |
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); | |
feaa7bba SW |
41 | struct gfs2_sbd *sdp = GFS2_SB(parent->d_inode); |
42 | struct gfs2_inode *dip = GFS2_I(parent->d_inode); | |
c752666c | 43 | struct inode *inode = dentry->d_inode; |
b3b94faa DT |
44 | struct gfs2_holder d_gh; |
45 | struct gfs2_inode *ip; | |
46 | struct gfs2_inum inum; | |
47 | unsigned int type; | |
48 | int error; | |
49 | ||
b3b94faa DT |
50 | if (inode && is_bad_inode(inode)) |
51 | goto invalid; | |
52 | ||
c752666c SW |
53 | if (sdp->sd_args.ar_localcaching) |
54 | goto valid; | |
55 | ||
b3b94faa DT |
56 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
57 | if (error) | |
58 | goto fail; | |
59 | ||
c752666c | 60 | error = gfs2_dir_search(parent->d_inode, &dentry->d_name, &inum, &type); |
b3b94faa DT |
61 | 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 | ||
feaa7bba | 74 | ip = GFS2_I(inode); |
b3b94faa DT |
75 | |
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: | |
b3b94faa DT |
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 | ||
b3b94faa DT |
102 | dput(parent); |
103 | return 0; | |
104 | ||
105 | fail_gunlock: | |
106 | gfs2_glock_dq_uninit(&d_gh); | |
107 | ||
108 | fail: | |
b3b94faa DT |
109 | dput(parent); |
110 | return 0; | |
111 | } | |
112 | ||
c752666c SW |
113 | static 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 | ||
b3b94faa DT |
119 | struct dentry_operations gfs2_dops = { |
120 | .d_revalidate = gfs2_drevalidate, | |
c752666c | 121 | .d_hash = gfs2_dhash, |
b3b94faa DT |
122 | }; |
123 |