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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>
Nick Piggin34286d62011-01-07 17:49:57 +110014#include <linux/namei.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050015#include <linux/crc32.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000016
17#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050018#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000019#include "dir.h"
20#include "glock.h"
Steven Whitehouseb2760582008-10-14 16:05:55 +010021#include "super.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050022#include "util.h"
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010023#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000024
25/**
26 * gfs2_drevalidate - Check directory lookup consistency
27 * @dentry: the mapping to check
Al Viro0b728e12012-06-10 16:03:43 -040028 * @flags: lookup flags
David Teiglandb3b94fa2006-01-16 16:50:04 +000029 *
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
Al Viro0b728e12012-06-10 16:03:43 -040036static int gfs2_drevalidate(struct dentry *dentry, unsigned int flags)
David Teiglandb3b94fa2006-01-16 16:50:04 +000037{
Nick Piggin34286d62011-01-07 17:49:57 +110038 struct dentry *parent;
39 struct gfs2_sbd *sdp;
40 struct gfs2_inode *dip;
41 struct inode *inode;
David Teiglandb3b94fa2006-01-16 16:50:04 +000042 struct gfs2_holder d_gh;
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010043 struct gfs2_inode *ip = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +000044 int error;
Steven Whitehouse7afd88d2008-02-22 16:07:18 +000045 int had_lock = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +000046
Al Viro0b728e12012-06-10 16:03:43 -040047 if (flags & LOOKUP_RCU)
Nick Piggin34286d62011-01-07 17:49:57 +110048 return -ECHILD;
49
50 parent = dget_parent(dentry);
David Howells2b0143b2015-03-17 22:25:59 +000051 sdp = GFS2_SB(d_inode(parent));
52 dip = GFS2_I(d_inode(parent));
53 inode = d_inode(dentry);
Nick Piggin34286d62011-01-07 17:49:57 +110054
Steven Whitehousedbb7cae2007-05-15 15:37:50 +010055 if (inode) {
56 if (is_bad_inode(inode))
57 goto invalid;
58 ip = GFS2_I(inode);
59 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000060
Steven Whitehousec2048b002010-09-23 14:00:31 +010061 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
Steven Whitehousec7526662006-03-20 12:30:04 -050062 goto valid;
63
Steven Whitehouse7afd88d2008-02-22 16:07:18 +000064 had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
Wendy Cheng549ae0a2007-02-06 03:52:16 -050065 if (!had_lock) {
66 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
67 if (error)
68 goto fail;
69 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000070
David Howells2b0143b2015-03-17 22:25:59 +000071 error = gfs2_dir_check(d_inode(parent), &dentry->d_name, ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +000072 switch (error) {
73 case 0:
74 if (!inode)
75 goto invalid_gunlock;
76 break;
77 case -ENOENT:
78 if (!inode)
79 goto valid_gunlock;
80 goto invalid_gunlock;
81 default:
82 goto fail_gunlock;
83 }
84
Steven Whitehousea91ea692006-09-04 12:04:26 -040085valid_gunlock:
Wendy Cheng549ae0a2007-02-06 03:52:16 -050086 if (!had_lock)
87 gfs2_glock_dq_uninit(&d_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -040088valid:
David Teiglandb3b94fa2006-01-16 16:50:04 +000089 dput(parent);
90 return 1;
91
Steven Whitehousea91ea692006-09-04 12:04:26 -040092invalid_gunlock:
Wendy Cheng549ae0a2007-02-06 03:52:16 -050093 if (!had_lock)
94 gfs2_glock_dq_uninit(&d_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -040095invalid:
David Teiglandb3b94fa2006-01-16 16:50:04 +000096 dput(parent);
97 return 0;
98
Steven Whitehousea91ea692006-09-04 12:04:26 -040099fail_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000100 gfs2_glock_dq_uninit(&d_gh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400101fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000102 dput(parent);
103 return 0;
104}
105
Linus Torvaldsda53be12013-05-21 15:22:44 -0700106static int gfs2_dhash(const struct dentry *dentry, struct qstr *str)
Steven Whitehousec7526662006-03-20 12:30:04 -0500107{
108 str->hash = gfs2_disk_hash(str->name, str->len);
109 return 0;
110}
111
Nick Pigginfe15ce42011-01-07 17:49:23 +1100112static int gfs2_dentry_delete(const struct dentry *dentry)
Wengang Wang970343c2009-08-18 14:25:03 +0800113{
114 struct gfs2_inode *ginode;
115
David Howells2b0143b2015-03-17 22:25:59 +0000116 if (d_really_is_negative(dentry))
Wengang Wang970343c2009-08-18 14:25:03 +0800117 return 0;
118
David Howells2b0143b2015-03-17 22:25:59 +0000119 ginode = GFS2_I(d_inode(dentry));
Wengang Wang970343c2009-08-18 14:25:03 +0800120 if (!ginode->i_iopen_gh.gh_gl)
121 return 0;
122
123 if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))
124 return 1;
125
126 return 0;
127}
128
Al Viro92cecbb2009-02-20 06:00:05 +0000129const struct dentry_operations gfs2_dops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000130 .d_revalidate = gfs2_drevalidate,
Steven Whitehousec7526662006-03-20 12:30:04 -0500131 .d_hash = gfs2_dhash,
Wengang Wang970343c2009-08-18 14:25:03 +0800132 .d_delete = gfs2_dentry_delete,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000133};
134