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