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> |
7d308590 | 16 | #include <linux/lm_interface.h> |
b3b94faa DT |
17 | |
18 | #include "gfs2.h" | |
5c676f6d | 19 | #include "incore.h" |
b3b94faa DT |
20 | #include "dir.h" |
21 | #include "glock.h" | |
22 | #include "ops_dentry.h" | |
5c676f6d | 23 | #include "util.h" |
dbb7cae2 | 24 | #include "inode.h" |
b3b94faa DT |
25 | |
26 | /** | |
27 | * gfs2_drevalidate - Check directory lookup consistency | |
28 | * @dentry: the mapping to check | |
29 | * @nd: | |
30 | * | |
31 | * Check to make sure the lookup necessary to arrive at this inode from its | |
32 | * parent is still good. | |
33 | * | |
34 | * Returns: 1 if the dentry is ok, 0 if it isn't | |
35 | */ | |
36 | ||
37 | static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd) | |
38 | { | |
39 | struct dentry *parent = dget_parent(dentry); | |
feaa7bba SW |
40 | struct gfs2_sbd *sdp = GFS2_SB(parent->d_inode); |
41 | struct gfs2_inode *dip = GFS2_I(parent->d_inode); | |
c752666c | 42 | struct inode *inode = dentry->d_inode; |
b3b94faa | 43 | struct gfs2_holder d_gh; |
dbb7cae2 | 44 | struct gfs2_inode *ip = NULL; |
b3b94faa | 45 | int error; |
549ae0ac | 46 | int had_lock=0; |
b3b94faa | 47 | |
dbb7cae2 SW |
48 | if (inode) { |
49 | if (is_bad_inode(inode)) | |
50 | goto invalid; | |
51 | ip = GFS2_I(inode); | |
52 | } | |
b3b94faa | 53 | |
c752666c SW |
54 | if (sdp->sd_args.ar_localcaching) |
55 | goto valid; | |
56 | ||
549ae0ac WC |
57 | had_lock = gfs2_glock_is_locked_by_me(dip->i_gl); |
58 | if (!had_lock) { | |
59 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
60 | if (error) | |
61 | goto fail; | |
62 | } | |
b3b94faa | 63 | |
dbb7cae2 | 64 | error = gfs2_dir_check(parent->d_inode, &dentry->d_name, ip); |
b3b94faa DT |
65 | switch (error) { |
66 | case 0: | |
67 | if (!inode) | |
68 | goto invalid_gunlock; | |
69 | break; | |
70 | case -ENOENT: | |
71 | if (!inode) | |
72 | goto valid_gunlock; | |
73 | goto invalid_gunlock; | |
74 | default: | |
75 | goto fail_gunlock; | |
76 | } | |
77 | ||
a91ea69f | 78 | valid_gunlock: |
549ae0ac WC |
79 | if (!had_lock) |
80 | gfs2_glock_dq_uninit(&d_gh); | |
a91ea69f | 81 | valid: |
b3b94faa DT |
82 | dput(parent); |
83 | return 1; | |
84 | ||
a91ea69f | 85 | invalid_gunlock: |
549ae0ac WC |
86 | if (!had_lock) |
87 | gfs2_glock_dq_uninit(&d_gh); | |
a91ea69f | 88 | invalid: |
b3b94faa DT |
89 | if (inode && S_ISDIR(inode->i_mode)) { |
90 | if (have_submounts(dentry)) | |
91 | goto valid; | |
92 | shrink_dcache_parent(dentry); | |
93 | } | |
94 | d_drop(dentry); | |
b3b94faa DT |
95 | dput(parent); |
96 | return 0; | |
97 | ||
a91ea69f | 98 | fail_gunlock: |
b3b94faa | 99 | gfs2_glock_dq_uninit(&d_gh); |
a91ea69f | 100 | fail: |
b3b94faa DT |
101 | dput(parent); |
102 | return 0; | |
103 | } | |
104 | ||
c752666c SW |
105 | static int gfs2_dhash(struct dentry *dentry, struct qstr *str) |
106 | { | |
107 | str->hash = gfs2_disk_hash(str->name, str->len); | |
108 | return 0; | |
109 | } | |
110 | ||
b3b94faa DT |
111 | struct dentry_operations gfs2_dops = { |
112 | .d_revalidate = gfs2_drevalidate, | |
c752666c | 113 | .d_hash = gfs2_dhash, |
b3b94faa DT |
114 | }; |
115 |