mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
8c5ca11710
Before this patch, function gfs2_drevalidate was a horrific tangle of unreadable labels, cases and goto statements. This patch tries to simplify the logic and make it more readable. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/gfs2_ondisk.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/crc32.h>
|
|
|
|
#include "gfs2.h"
|
|
#include "incore.h"
|
|
#include "dir.h"
|
|
#include "glock.h"
|
|
#include "super.h"
|
|
#include "util.h"
|
|
#include "inode.h"
|
|
|
|
/**
|
|
* gfs2_drevalidate - Check directory lookup consistency
|
|
* @dentry: the mapping to check
|
|
* @flags: lookup flags
|
|
*
|
|
* Check to make sure the lookup necessary to arrive at this inode from its
|
|
* parent is still good.
|
|
*
|
|
* Returns: 1 if the dentry is ok, 0 if it isn't
|
|
*/
|
|
|
|
static int gfs2_drevalidate(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
struct dentry *parent;
|
|
struct gfs2_sbd *sdp;
|
|
struct gfs2_inode *dip;
|
|
struct inode *inode;
|
|
struct gfs2_holder d_gh;
|
|
struct gfs2_inode *ip = NULL;
|
|
int error, valid = 0;
|
|
int had_lock = 0;
|
|
|
|
if (flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
parent = dget_parent(dentry);
|
|
sdp = GFS2_SB(d_inode(parent));
|
|
dip = GFS2_I(d_inode(parent));
|
|
inode = d_inode(dentry);
|
|
|
|
if (inode) {
|
|
if (is_bad_inode(inode))
|
|
goto out;
|
|
ip = GFS2_I(inode);
|
|
}
|
|
|
|
if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) {
|
|
valid = 1;
|
|
goto out;
|
|
}
|
|
|
|
had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
|
|
if (!had_lock) {
|
|
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
error = gfs2_dir_check(d_inode(parent), &dentry->d_name, ip);
|
|
valid = inode ? !error : (error == -ENOENT);
|
|
|
|
if (!had_lock)
|
|
gfs2_glock_dq_uninit(&d_gh);
|
|
out:
|
|
dput(parent);
|
|
return valid;
|
|
}
|
|
|
|
static int gfs2_dhash(const struct dentry *dentry, struct qstr *str)
|
|
{
|
|
str->hash = gfs2_disk_hash(str->name, str->len);
|
|
return 0;
|
|
}
|
|
|
|
static int gfs2_dentry_delete(const struct dentry *dentry)
|
|
{
|
|
struct gfs2_inode *ginode;
|
|
|
|
if (d_really_is_negative(dentry))
|
|
return 0;
|
|
|
|
ginode = GFS2_I(d_inode(dentry));
|
|
if (!gfs2_holder_initialized(&ginode->i_iopen_gh))
|
|
return 0;
|
|
|
|
if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct dentry_operations gfs2_dops = {
|
|
.d_revalidate = gfs2_drevalidate,
|
|
.d_hash = gfs2_dhash,
|
|
.d_delete = gfs2_dentry_delete,
|
|
};
|
|
|