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" |
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 DT |
42 | struct gfs2_holder d_gh; |
43 | struct gfs2_inode *ip; | |
629a21e7 | 44 | struct gfs2_inum_host inum; |
b3b94faa DT |
45 | unsigned int type; |
46 | int error; | |
549ae0ac | 47 | int had_lock=0; |
b3b94faa | 48 | |
b3b94faa DT |
49 | if (inode && is_bad_inode(inode)) |
50 | goto invalid; | |
51 | ||
c752666c SW |
52 | if (sdp->sd_args.ar_localcaching) |
53 | goto valid; | |
54 | ||
549ae0ac WC |
55 | had_lock = gfs2_glock_is_locked_by_me(dip->i_gl); |
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 | } | |
b3b94faa | 61 | |
c752666c | 62 | error = gfs2_dir_search(parent->d_inode, &dentry->d_name, &inum, &type); |
b3b94faa DT |
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 | ||
feaa7bba | 76 | ip = GFS2_I(inode); |
b3b94faa DT |
77 | |
78 | if (!gfs2_inum_equal(&ip->i_num, &inum)) | |
79 | goto invalid_gunlock; | |
80 | ||
b60623c2 | 81 | if (IF2DT(ip->i_inode.i_mode) != type) { |
b3b94faa DT |
82 | gfs2_consist_inode(dip); |
83 | goto fail_gunlock; | |
84 | } | |
85 | ||
a91ea69f | 86 | valid_gunlock: |
549ae0ac WC |
87 | if (!had_lock) |
88 | gfs2_glock_dq_uninit(&d_gh); | |
a91ea69f | 89 | valid: |
b3b94faa DT |
90 | dput(parent); |
91 | return 1; | |
92 | ||
a91ea69f | 93 | invalid_gunlock: |
549ae0ac WC |
94 | if (!had_lock) |
95 | gfs2_glock_dq_uninit(&d_gh); | |
a91ea69f | 96 | invalid: |
b3b94faa DT |
97 | if (inode && S_ISDIR(inode->i_mode)) { |
98 | if (have_submounts(dentry)) | |
99 | goto valid; | |
100 | shrink_dcache_parent(dentry); | |
101 | } | |
102 | d_drop(dentry); | |
b3b94faa DT |
103 | dput(parent); |
104 | return 0; | |
105 | ||
a91ea69f | 106 | fail_gunlock: |
b3b94faa | 107 | gfs2_glock_dq_uninit(&d_gh); |
a91ea69f | 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 |