forked from luck/tmp_suning_uos_patched
c2048b003c
This option defaulted to on for lock_nolock mounts and off otherwise. The only function was to avoid the revalidation of dentries. In the cluster case, that is entirely pointless and liable to cause coherency problems. The patch changes the revalidation to depend upon whether the fs is a local or cluster fs (i.e. it follows the existing default behaviour). I very much doubt anybody ever used this option as there is no reason to. Even so we will continue to accept it on the mount command line, but ignore it. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
132 lines
2.7 KiB
C
132 lines
2.7 KiB
C
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2006 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 version 2.
|
|
*/
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/gfs2_ondisk.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
|
|
* @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_sbd *sdp = GFS2_SB(parent->d_inode);
|
|
struct gfs2_inode *dip = GFS2_I(parent->d_inode);
|
|
struct inode *inode = dentry->d_inode;
|
|
struct gfs2_holder d_gh;
|
|
struct gfs2_inode *ip = NULL;
|
|
int error;
|
|
int had_lock = 0;
|
|
|
|
if (inode) {
|
|
if (is_bad_inode(inode))
|
|
goto invalid;
|
|
ip = GFS2_I(inode);
|
|
}
|
|
|
|
if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
|
|
goto valid;
|
|
|
|
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 fail;
|
|
}
|
|
|
|
error = gfs2_dir_check(parent->d_inode, &dentry->d_name, ip);
|
|
switch (error) {
|
|
case 0:
|
|
if (!inode)
|
|
goto invalid_gunlock;
|
|
break;
|
|
case -ENOENT:
|
|
if (!inode)
|
|
goto valid_gunlock;
|
|
goto invalid_gunlock;
|
|
default:
|
|
goto fail_gunlock;
|
|
}
|
|
|
|
valid_gunlock:
|
|
if (!had_lock)
|
|
gfs2_glock_dq_uninit(&d_gh);
|
|
valid:
|
|
dput(parent);
|
|
return 1;
|
|
|
|
invalid_gunlock:
|
|
if (!had_lock)
|
|
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);
|
|
dput(parent);
|
|
return 0;
|
|
|
|
fail_gunlock:
|
|
gfs2_glock_dq_uninit(&d_gh);
|
|
fail:
|
|
dput(parent);
|
|
return 0;
|
|
}
|
|
|
|
static int gfs2_dhash(struct dentry *dentry, struct qstr *str)
|
|
{
|
|
str->hash = gfs2_disk_hash(str->name, str->len);
|
|
return 0;
|
|
}
|
|
|
|
static int gfs2_dentry_delete(struct dentry *dentry)
|
|
{
|
|
struct gfs2_inode *ginode;
|
|
|
|
if (!dentry->d_inode)
|
|
return 0;
|
|
|
|
ginode = GFS2_I(dentry->d_inode);
|
|
if (!ginode->i_iopen_gh.gh_gl)
|
|
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,
|
|
};
|
|
|