b3b94faa5f
This patch contains all the core files for GFS2. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
117 lines
2.3 KiB
C
117 lines
2.3 KiB
C
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU General Public License v.2.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <asm/semaphore.h>
|
|
|
|
#include "gfs2.h"
|
|
#include "dir.h"
|
|
#include "glock.h"
|
|
#include "ops_dentry.h"
|
|
|
|
/**
|
|
* gfs2_drevalidate - Check directory lookup consistency
|
|
* @dentry: the mapping to check
|
|
* @nd:
|
|
*
|
|
* 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, struct nameidata *nd)
|
|
{
|
|
struct dentry *parent = dget_parent(dentry);
|
|
struct gfs2_inode *dip = get_v2ip(parent->d_inode);
|
|
struct gfs2_sbd *sdp = dip->i_sbd;
|
|
struct inode *inode;
|
|
struct gfs2_holder d_gh;
|
|
struct gfs2_inode *ip;
|
|
struct gfs2_inum inum;
|
|
unsigned int type;
|
|
int error;
|
|
|
|
lock_kernel();
|
|
|
|
atomic_inc(&sdp->sd_ops_dentry);
|
|
|
|
inode = dentry->d_inode;
|
|
if (inode && is_bad_inode(inode))
|
|
goto invalid;
|
|
|
|
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
|
|
if (error)
|
|
goto fail;
|
|
|
|
error = gfs2_dir_search(dip, &dentry->d_name, &inum, &type);
|
|
switch (error) {
|
|
case 0:
|
|
if (!inode)
|
|
goto invalid_gunlock;
|
|
break;
|
|
case -ENOENT:
|
|
if (!inode)
|
|
goto valid_gunlock;
|
|
goto invalid_gunlock;
|
|
default:
|
|
goto fail_gunlock;
|
|
}
|
|
|
|
ip = get_v2ip(inode);
|
|
|
|
if (!gfs2_inum_equal(&ip->i_num, &inum))
|
|
goto invalid_gunlock;
|
|
|
|
if (IF2DT(ip->i_di.di_mode) != type) {
|
|
gfs2_consist_inode(dip);
|
|
goto fail_gunlock;
|
|
}
|
|
|
|
valid_gunlock:
|
|
gfs2_glock_dq_uninit(&d_gh);
|
|
|
|
valid:
|
|
unlock_kernel();
|
|
dput(parent);
|
|
return 1;
|
|
|
|
invalid_gunlock:
|
|
gfs2_glock_dq_uninit(&d_gh);
|
|
|
|
invalid:
|
|
if (inode && S_ISDIR(inode->i_mode)) {
|
|
if (have_submounts(dentry))
|
|
goto valid;
|
|
shrink_dcache_parent(dentry);
|
|
}
|
|
d_drop(dentry);
|
|
|
|
unlock_kernel();
|
|
dput(parent);
|
|
return 0;
|
|
|
|
fail_gunlock:
|
|
gfs2_glock_dq_uninit(&d_gh);
|
|
|
|
fail:
|
|
unlock_kernel();
|
|
dput(parent);
|
|
return 0;
|
|
}
|
|
|
|
struct dentry_operations gfs2_dops = {
|
|
.d_revalidate = gfs2_drevalidate,
|
|
};
|
|
|