[PATCH] remove many unneeded #includes of sched.h
[linux-2.6.git] / fs / gfs2 / ops_dentry.c
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/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/smp_lock.h>
15 #include <linux/gfs2_ondisk.h>
16 #include <linux/crc32.h>
17 #include <linux/lm_interface.h>
18
19 #include "gfs2.h"
20 #include "incore.h"
21 #include "dir.h"
22 #include "glock.h"
23 #include "ops_dentry.h"
24 #include "util.h"
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);
40         struct gfs2_sbd *sdp = GFS2_SB(parent->d_inode);
41         struct gfs2_inode *dip = GFS2_I(parent->d_inode);
42         struct inode *inode = dentry->d_inode;
43         struct gfs2_holder d_gh;
44         struct gfs2_inode *ip;
45         struct gfs2_inum_host inum;
46         unsigned int type;
47         int error;
48         int had_lock=0;
49
50         if (inode && is_bad_inode(inode))
51                 goto invalid;
52
53         if (sdp->sd_args.ar_localcaching)
54                 goto valid;
55
56         had_lock = gfs2_glock_is_locked_by_me(dip->i_gl);
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         } 
62
63         error = gfs2_dir_search(parent->d_inode, &dentry->d_name, &inum, &type);
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
77         ip = GFS2_I(inode);
78
79         if (!gfs2_inum_equal(&ip->i_num, &inum))
80                 goto invalid_gunlock;
81
82         if (IF2DT(ip->i_inode.i_mode) != type) {
83                 gfs2_consist_inode(dip);
84                 goto fail_gunlock;
85         }
86
87 valid_gunlock:
88         if (!had_lock)
89                 gfs2_glock_dq_uninit(&d_gh);
90 valid:
91         dput(parent);
92         return 1;
93
94 invalid_gunlock:
95         if (!had_lock)
96                 gfs2_glock_dq_uninit(&d_gh);
97 invalid:
98         if (inode && S_ISDIR(inode->i_mode)) {
99                 if (have_submounts(dentry))
100                         goto valid;
101                 shrink_dcache_parent(dentry);
102         }
103         d_drop(dentry);
104         dput(parent);
105         return 0;
106
107 fail_gunlock:
108         gfs2_glock_dq_uninit(&d_gh);
109 fail:
110         dput(parent);
111         return 0;
112 }
113
114 static int gfs2_dhash(struct dentry *dentry, struct qstr *str)
115 {
116         str->hash = gfs2_disk_hash(str->name, str->len);
117         return 0;
118 }
119
120 struct dentry_operations gfs2_dops = {
121         .d_revalidate = gfs2_drevalidate,
122         .d_hash = gfs2_dhash,
123 };
124