17336d0e6SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2b1e71b06SSteven Whitehouse /*
3b1e71b06SSteven Whitehouse * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4b1e71b06SSteven Whitehouse * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5b1e71b06SSteven Whitehouse */
6b1e71b06SSteven Whitehouse
7b1e71b06SSteven Whitehouse #include <linux/spinlock.h>
8b1e71b06SSteven Whitehouse #include <linux/completion.h>
9b1e71b06SSteven Whitehouse #include <linux/buffer_head.h>
10b1e71b06SSteven Whitehouse #include <linux/gfs2_ondisk.h>
1134286d66SNick Piggin #include <linux/namei.h>
12b1e71b06SSteven Whitehouse #include <linux/crc32.h>
13b1e71b06SSteven Whitehouse
14b1e71b06SSteven Whitehouse #include "gfs2.h"
15b1e71b06SSteven Whitehouse #include "incore.h"
16b1e71b06SSteven Whitehouse #include "dir.h"
17b1e71b06SSteven Whitehouse #include "glock.h"
18b1e71b06SSteven Whitehouse #include "super.h"
19b1e71b06SSteven Whitehouse #include "util.h"
20b1e71b06SSteven Whitehouse #include "inode.h"
21b1e71b06SSteven Whitehouse
22b1e71b06SSteven Whitehouse /**
23b1e71b06SSteven Whitehouse * gfs2_drevalidate - Check directory lookup consistency
24b1e71b06SSteven Whitehouse * @dentry: the mapping to check
250b728e19SAl Viro * @flags: lookup flags
26b1e71b06SSteven Whitehouse *
27b1e71b06SSteven Whitehouse * Check to make sure the lookup necessary to arrive at this inode from its
28b1e71b06SSteven Whitehouse * parent is still good.
29b1e71b06SSteven Whitehouse *
30b1e71b06SSteven Whitehouse * Returns: 1 if the dentry is ok, 0 if it isn't
31b1e71b06SSteven Whitehouse */
32b1e71b06SSteven Whitehouse
gfs2_drevalidate(struct dentry * dentry,unsigned int flags)330b728e19SAl Viro static int gfs2_drevalidate(struct dentry *dentry, unsigned int flags)
34b1e71b06SSteven Whitehouse {
3534286d66SNick Piggin struct dentry *parent;
3634286d66SNick Piggin struct gfs2_sbd *sdp;
3734286d66SNick Piggin struct gfs2_inode *dip;
3834286d66SNick Piggin struct inode *inode;
39b1e71b06SSteven Whitehouse struct gfs2_holder d_gh;
40b1e71b06SSteven Whitehouse struct gfs2_inode *ip = NULL;
418c5ca117SBob Peterson int error, valid = 0;
42b1e71b06SSteven Whitehouse int had_lock = 0;
43b1e71b06SSteven Whitehouse
440b728e19SAl Viro if (flags & LOOKUP_RCU)
4534286d66SNick Piggin return -ECHILD;
4634286d66SNick Piggin
4734286d66SNick Piggin parent = dget_parent(dentry);
482b0143b5SDavid Howells sdp = GFS2_SB(d_inode(parent));
492b0143b5SDavid Howells dip = GFS2_I(d_inode(parent));
502b0143b5SDavid Howells inode = d_inode(dentry);
5134286d66SNick Piggin
52b1e71b06SSteven Whitehouse if (inode) {
53b1e71b06SSteven Whitehouse if (is_bad_inode(inode))
548c5ca117SBob Peterson goto out;
55b1e71b06SSteven Whitehouse ip = GFS2_I(inode);
56b1e71b06SSteven Whitehouse }
57b1e71b06SSteven Whitehouse
588c5ca117SBob Peterson if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) {
598c5ca117SBob Peterson valid = 1;
608c5ca117SBob Peterson goto out;
618c5ca117SBob Peterson }
62b1e71b06SSteven Whitehouse
63b1e71b06SSteven Whitehouse had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
64b1e71b06SSteven Whitehouse if (!had_lock) {
65b1e71b06SSteven Whitehouse error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
66b1e71b06SSteven Whitehouse if (error)
678c5ca117SBob Peterson goto out;
68b1e71b06SSteven Whitehouse }
69b1e71b06SSteven Whitehouse
702b0143b5SDavid Howells error = gfs2_dir_check(d_inode(parent), &dentry->d_name, ip);
718c5ca117SBob Peterson valid = inode ? !error : (error == -ENOENT);
72b1e71b06SSteven Whitehouse
73b1e71b06SSteven Whitehouse if (!had_lock)
74b1e71b06SSteven Whitehouse gfs2_glock_dq_uninit(&d_gh);
758c5ca117SBob Peterson out:
76b1e71b06SSteven Whitehouse dput(parent);
778c5ca117SBob Peterson return valid;
78b1e71b06SSteven Whitehouse }
79b1e71b06SSteven Whitehouse
gfs2_dhash(const struct dentry * dentry,struct qstr * str)80da53be12SLinus Torvalds static int gfs2_dhash(const struct dentry *dentry, struct qstr *str)
81b1e71b06SSteven Whitehouse {
82b1e71b06SSteven Whitehouse str->hash = gfs2_disk_hash(str->name, str->len);
83b1e71b06SSteven Whitehouse return 0;
84b1e71b06SSteven Whitehouse }
85b1e71b06SSteven Whitehouse
gfs2_dentry_delete(const struct dentry * dentry)86*260595b4SBob Peterson static int gfs2_dentry_delete(const struct dentry *dentry)
87*260595b4SBob Peterson {
88*260595b4SBob Peterson struct gfs2_inode *ginode;
89*260595b4SBob Peterson
90*260595b4SBob Peterson if (d_really_is_negative(dentry))
91*260595b4SBob Peterson return 0;
92*260595b4SBob Peterson
93*260595b4SBob Peterson ginode = GFS2_I(d_inode(dentry));
94*260595b4SBob Peterson if (!gfs2_holder_initialized(&ginode->i_iopen_gh))
95*260595b4SBob Peterson return 0;
96*260595b4SBob Peterson
97*260595b4SBob Peterson if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))
98*260595b4SBob Peterson return 1;
99*260595b4SBob Peterson
100*260595b4SBob Peterson return 0;
101*260595b4SBob Peterson }
102*260595b4SBob Peterson
103b1e71b06SSteven Whitehouse const struct dentry_operations gfs2_dops = {
104b1e71b06SSteven Whitehouse .d_revalidate = gfs2_drevalidate,
105b1e71b06SSteven Whitehouse .d_hash = gfs2_dhash,
106*260595b4SBob Peterson .d_delete = gfs2_dentry_delete,
107b1e71b06SSteven Whitehouse };
108b1e71b06SSteven Whitehouse
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