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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (C) 2011 Lawrence Livermore National Security, LLC.
*/
#ifndef _ZFS_DCACHE_H
#define _ZFS_DCACHE_H
#include <linux/dcache.h>
#define dname(dentry) ((char *)((dentry)->d_name.name))
#define dlen(dentry) ((int)((dentry)->d_name.len))
#ifndef HAVE_D_MAKE_ROOT
#define d_make_root(inode) d_alloc_root(inode)
#endif /* HAVE_D_MAKE_ROOT */
/*
* 2.6.30 API change,
* The const keyword was added to the 'struct dentry_operations' in
* the dentry structure. To handle this we define an appropriate
* dentry_operations_t typedef which can be used.
*/
#ifdef HAVE_CONST_DENTRY_OPERATIONS
typedef const struct dentry_operations dentry_operations_t;
#else
typedef struct dentry_operations dentry_operations_t;
#endif
/*
* 2.6.38 API change,
* Added d_set_d_op() helper function which sets some flags in
* dentry->d_flags based on which operations are defined.
*/
#ifndef HAVE_D_SET_D_OP
static inline void
d_set_d_op(struct dentry *dentry, dentry_operations_t *op)
{
dentry->d_op = op;
}
#endif /* HAVE_D_SET_D_OP */
/*
* 2.6.38 API addition,
* Added d_clear_d_op() helper function which clears some flags and the
* registered dentry->d_op table. This is required because d_set_d_op()
* issues a warning when the dentry operations table is already set.
* For the .zfs control directory to work properly we must be able to
* override the default operations table and register custom .d_automount
* and .d_revalidate callbacks.
*/
static inline void
d_clear_d_op(struct dentry *dentry)
{
#ifdef HAVE_D_SET_D_OP
dentry->d_op = NULL;
dentry->d_flags &= ~(
DCACHE_OP_HASH | DCACHE_OP_COMPARE |
DCACHE_OP_REVALIDATE | DCACHE_OP_DELETE);
#endif /* HAVE_D_SET_D_OP */
}
#endif /* _ZFS_DCACHE_H */
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