115 lines
2.3 KiB
C
115 lines
2.3 KiB
C
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/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/smp_lock.h>
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#include <asm/semaphore.h>
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#include "gfs2.h"
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#include "dir.h"
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#include "glock.h"
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#include "ops_dentry.h"
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/**
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* gfs2_drevalidate - Check directory lookup consistency
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* @dentry: the mapping to check
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* @nd:
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*
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* Check to make sure the lookup necessary to arrive at this inode from its
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* parent is still good.
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*
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* Returns: 1 if the dentry is ok, 0 if it isn't
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*/
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static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd)
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{
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struct dentry *parent = dget_parent(dentry);
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struct gfs2_inode *dip = get_v2ip(parent->d_inode);
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struct inode *inode;
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struct gfs2_holder d_gh;
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struct gfs2_inode *ip;
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struct gfs2_inum inum;
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unsigned int type;
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int error;
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lock_kernel();
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inode = dentry->d_inode;
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if (inode && is_bad_inode(inode))
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goto invalid;
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error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
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if (error)
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goto fail;
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error = gfs2_dir_search(dip, &dentry->d_name, &inum, &type);
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switch (error) {
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case 0:
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if (!inode)
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goto invalid_gunlock;
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break;
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case -ENOENT:
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if (!inode)
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goto valid_gunlock;
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goto invalid_gunlock;
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default:
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goto fail_gunlock;
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}
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ip = get_v2ip(inode);
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if (!gfs2_inum_equal(&ip->i_num, &inum))
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goto invalid_gunlock;
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if (IF2DT(ip->i_di.di_mode) != type) {
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gfs2_consist_inode(dip);
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goto fail_gunlock;
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}
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valid_gunlock:
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gfs2_glock_dq_uninit(&d_gh);
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valid:
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unlock_kernel();
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dput(parent);
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return 1;
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invalid_gunlock:
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gfs2_glock_dq_uninit(&d_gh);
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invalid:
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if (inode && S_ISDIR(inode->i_mode)) {
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if (have_submounts(dentry))
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goto valid;
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shrink_dcache_parent(dentry);
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}
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d_drop(dentry);
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unlock_kernel();
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dput(parent);
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return 0;
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fail_gunlock:
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gfs2_glock_dq_uninit(&d_gh);
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fail:
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unlock_kernel();
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dput(parent);
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return 0;
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}
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struct dentry_operations gfs2_dops = {
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.d_revalidate = gfs2_drevalidate,
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};
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