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