Root/
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_args.ar_localcaching) |
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 | |
132 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9