1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4*4882a593Smuzhiyun * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/spinlock.h>
8*4882a593Smuzhiyun #include <linux/completion.h>
9*4882a593Smuzhiyun #include <linux/buffer_head.h>
10*4882a593Smuzhiyun #include <linux/gfs2_ondisk.h>
11*4882a593Smuzhiyun #include <linux/namei.h>
12*4882a593Smuzhiyun #include <linux/crc32.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "gfs2.h"
15*4882a593Smuzhiyun #include "incore.h"
16*4882a593Smuzhiyun #include "dir.h"
17*4882a593Smuzhiyun #include "glock.h"
18*4882a593Smuzhiyun #include "super.h"
19*4882a593Smuzhiyun #include "util.h"
20*4882a593Smuzhiyun #include "inode.h"
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /**
23*4882a593Smuzhiyun * gfs2_drevalidate - Check directory lookup consistency
24*4882a593Smuzhiyun * @dentry: the mapping to check
25*4882a593Smuzhiyun * @flags: lookup flags
26*4882a593Smuzhiyun *
27*4882a593Smuzhiyun * Check to make sure the lookup necessary to arrive at this inode from its
28*4882a593Smuzhiyun * parent is still good.
29*4882a593Smuzhiyun *
30*4882a593Smuzhiyun * Returns: 1 if the dentry is ok, 0 if it isn't
31*4882a593Smuzhiyun */
32*4882a593Smuzhiyun
gfs2_drevalidate(struct dentry * dentry,unsigned int flags)33*4882a593Smuzhiyun static int gfs2_drevalidate(struct dentry *dentry, unsigned int flags)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun struct dentry *parent;
36*4882a593Smuzhiyun struct gfs2_sbd *sdp;
37*4882a593Smuzhiyun struct gfs2_inode *dip;
38*4882a593Smuzhiyun struct inode *inode;
39*4882a593Smuzhiyun struct gfs2_holder d_gh;
40*4882a593Smuzhiyun struct gfs2_inode *ip = NULL;
41*4882a593Smuzhiyun int error, valid = 0;
42*4882a593Smuzhiyun int had_lock = 0;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun if (flags & LOOKUP_RCU)
45*4882a593Smuzhiyun return -ECHILD;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun parent = dget_parent(dentry);
48*4882a593Smuzhiyun sdp = GFS2_SB(d_inode(parent));
49*4882a593Smuzhiyun dip = GFS2_I(d_inode(parent));
50*4882a593Smuzhiyun inode = d_inode(dentry);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun if (inode) {
53*4882a593Smuzhiyun if (is_bad_inode(inode))
54*4882a593Smuzhiyun goto out;
55*4882a593Smuzhiyun ip = GFS2_I(inode);
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) {
59*4882a593Smuzhiyun valid = 1;
60*4882a593Smuzhiyun goto out;
61*4882a593Smuzhiyun }
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
64*4882a593Smuzhiyun if (!had_lock) {
65*4882a593Smuzhiyun error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
66*4882a593Smuzhiyun if (error)
67*4882a593Smuzhiyun goto out;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun error = gfs2_dir_check(d_inode(parent), &dentry->d_name, ip);
71*4882a593Smuzhiyun valid = inode ? !error : (error == -ENOENT);
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun if (!had_lock)
74*4882a593Smuzhiyun gfs2_glock_dq_uninit(&d_gh);
75*4882a593Smuzhiyun out:
76*4882a593Smuzhiyun dput(parent);
77*4882a593Smuzhiyun return valid;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
gfs2_dhash(const struct dentry * dentry,struct qstr * str)80*4882a593Smuzhiyun static int gfs2_dhash(const struct dentry *dentry, struct qstr *str)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun str->hash = gfs2_disk_hash(str->name, str->len);
83*4882a593Smuzhiyun return 0;
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
gfs2_dentry_delete(const struct dentry * dentry)86*4882a593Smuzhiyun static int gfs2_dentry_delete(const struct dentry *dentry)
87*4882a593Smuzhiyun {
88*4882a593Smuzhiyun struct gfs2_inode *ginode;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun if (d_really_is_negative(dentry))
91*4882a593Smuzhiyun return 0;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun ginode = GFS2_I(d_inode(dentry));
94*4882a593Smuzhiyun if (!gfs2_holder_initialized(&ginode->i_iopen_gh))
95*4882a593Smuzhiyun return 0;
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))
98*4882a593Smuzhiyun return 1;
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun return 0;
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun const struct dentry_operations gfs2_dops = {
104*4882a593Smuzhiyun .d_revalidate = gfs2_drevalidate,
105*4882a593Smuzhiyun .d_hash = gfs2_dhash,
106*4882a593Smuzhiyun .d_delete = gfs2_dentry_delete,
107*4882a593Smuzhiyun };
108*4882a593Smuzhiyun
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