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 | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
b3b94faa DT |
10 | #include <linux/slab.h> |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/completion.h> | |
13 | #include <linux/buffer_head.h> | |
5c676f6d | 14 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 15 | #include <linux/crc32.h> |
b3b94faa DT |
16 | |
17 | #include "gfs2.h" | |
5c676f6d | 18 | #include "incore.h" |
b3b94faa DT |
19 | #include "dir.h" |
20 | #include "glock.h" | |
b2760583 | 21 | #include "super.h" |
5c676f6d | 22 | #include "util.h" |
dbb7cae2 | 23 | #include "inode.h" |
b3b94faa DT |
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 | ||
36 | static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd) | |
37 | { | |
38 | struct dentry *parent = dget_parent(dentry); | |
feaa7bba SW |
39 | struct gfs2_sbd *sdp = GFS2_SB(parent->d_inode); |
40 | struct gfs2_inode *dip = GFS2_I(parent->d_inode); | |
c752666c | 41 | struct inode *inode = dentry->d_inode; |
b3b94faa | 42 | struct gfs2_holder d_gh; |
dbb7cae2 | 43 | struct gfs2_inode *ip = NULL; |
b3b94faa | 44 | int error; |
7afd88d9 | 45 | int had_lock = 0; |
b3b94faa | 46 | |
dbb7cae2 SW |
47 | if (inode) { |
48 | if (is_bad_inode(inode)) | |
49 | goto invalid; | |
50 | ip = GFS2_I(inode); | |
51 | } | |
b3b94faa | 52 | |
c752666c SW |
53 | if (sdp->sd_args.ar_localcaching) |
54 | goto valid; | |
55 | ||
7afd88d9 | 56 | had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL); |
549ae0ac WC |
57 | if (!had_lock) { |
58 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
59 | if (error) | |
60 | goto fail; | |
61 | } | |
b3b94faa | 62 | |
dbb7cae2 | 63 | error = gfs2_dir_check(parent->d_inode, &dentry->d_name, ip); |
b3b94faa DT |
64 | switch (error) { |
65 | case 0: | |
66 | if (!inode) | |
67 | goto invalid_gunlock; | |
68 | break; | |
69 | case -ENOENT: | |
70 | if (!inode) | |
71 | goto valid_gunlock; | |
72 | goto invalid_gunlock; | |
73 | default: | |
74 | goto fail_gunlock; | |
75 | } | |
76 | ||
a91ea69f | 77 | valid_gunlock: |
549ae0ac WC |
78 | if (!had_lock) |
79 | gfs2_glock_dq_uninit(&d_gh); | |
a91ea69f | 80 | valid: |
b3b94faa DT |
81 | dput(parent); |
82 | return 1; | |
83 | ||
a91ea69f | 84 | invalid_gunlock: |
549ae0ac WC |
85 | if (!had_lock) |
86 | gfs2_glock_dq_uninit(&d_gh); | |
a91ea69f | 87 | invalid: |
b3b94faa DT |
88 | if (inode && S_ISDIR(inode->i_mode)) { |
89 | if (have_submounts(dentry)) | |
90 | goto valid; | |
91 | shrink_dcache_parent(dentry); | |
92 | } | |
93 | d_drop(dentry); | |
b3b94faa DT |
94 | dput(parent); |
95 | return 0; | |
96 | ||
a91ea69f | 97 | fail_gunlock: |
b3b94faa | 98 | gfs2_glock_dq_uninit(&d_gh); |
a91ea69f | 99 | fail: |
b3b94faa DT |
100 | dput(parent); |
101 | return 0; | |
102 | } | |
103 | ||
c752666c SW |
104 | static int gfs2_dhash(struct dentry *dentry, struct qstr *str) |
105 | { | |
106 | str->hash = gfs2_disk_hash(str->name, str->len); | |
107 | return 0; | |
108 | } | |
109 | ||
92cecbbf | 110 | const struct dentry_operations gfs2_dops = { |
b3b94faa | 111 | .d_revalidate = gfs2_drevalidate, |
c752666c | 112 | .d_hash = gfs2_dhash, |
b3b94faa DT |
113 | }; |
114 |