Orange Pi5 kernel

// 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,
};