blob: 6798755b3858685b611da5e439393bcffb332563 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
David Teiglandb3b94fa2006-01-16 16:50:04 +000010#include <linux/spinlock.h>
11#include <linux/completion.h>
12#include <linux/buffer_head.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050013#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050014#include <linux/crc32.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000015
16#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050017#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000018#include "dir.h"
19#include "glock.h"
Steven Whitehouseb2760582008-10-14 16:05:55 +010020#include "super.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050021#include "util.h"
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010022#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000023
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
35static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd)
36{
37 struct dentry *parent = dget_parent(dentry);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040038 struct gfs2_sbd *sdp = GFS2_SB(parent->d_inode);
39 struct gfs2_inode *dip = GFS2_I(parent->d_inode);
Steven Whitehousec7526662006-03-20 12:30:04 -050040 struct inode *inode = dentry->d_inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +000041 struct gfs2_holder d_gh;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010042 struct gfs2_inode *ip = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +000043 int error;
Steven Whitehouse7afd88d2008-02-22 16:07:18 +000044 int had_lock = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +000045
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010046 if (inode) {
47 if (is_bad_inode(inode))
48 goto invalid;
49 ip = GFS2_I(inode);
50 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000051
Steven Whitehousec2048b002010-09-23 14:00:31 +010052 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
Steven Whitehousec7526662006-03-20 12:30:04 -050053 goto valid;
54
Steven Whitehouse7afd88d2008-02-22 16:07:18 +000055 had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
Wendy Cheng549ae0a2007-02-06 03:52:16 -050056 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 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000061
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010062 error = gfs2_dir_check(parent->d_inode, &dentry->d_name, ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +000063 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
Steven Whitehousea91ea692006-09-04 12:04:26 -040076valid_gunlock:
Wendy Cheng549ae0a2007-02-06 03:52:16 -050077 if (!had_lock)
78 gfs2_glock_dq_uninit(&d_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -040079valid:
David Teiglandb3b94fa2006-01-16 16:50:04 +000080 dput(parent);
81 return 1;
82
Steven Whitehousea91ea692006-09-04 12:04:26 -040083invalid_gunlock:
Wendy Cheng549ae0a2007-02-06 03:52:16 -050084 if (!had_lock)
85 gfs2_glock_dq_uninit(&d_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -040086invalid:
David Teiglandb3b94fa2006-01-16 16:50:04 +000087 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);
David Teiglandb3b94fa2006-01-16 16:50:04 +000093 dput(parent);
94 return 0;
95
Steven Whitehousea91ea692006-09-04 12:04:26 -040096fail_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +000097 gfs2_glock_dq_uninit(&d_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -040098fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +000099 dput(parent);
100 return 0;
101}
102
Steven Whitehousec7526662006-03-20 12:30:04 -0500103static 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
Wengang Wang970343c2009-08-18 14:25:03 +0800109static 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
Al Viro92cecbb2009-02-20 06:00:05 +0000126const struct dentry_operations gfs2_dops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000127 .d_revalidate = gfs2_drevalidate,
Steven Whitehousec7526662006-03-20 12:30:04 -0500128 .d_hash = gfs2_dhash,
Wengang Wang970343c2009-08-18 14:25:03 +0800129 .d_delete = gfs2_dentry_delete,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000130};
131