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/*
* This file is part of the SPL: Solaris Porting Layer.
*
* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
* Produced at Lawrence Livermore National Laboratory
* Written by:
* Brian Behlendorf <behlendorf1@llnl.gov>,
* Herb Wartens <wartens2@llnl.gov>,
* Jim Garlick <garlick@llnl.gov>
* UCRL-CODE-235197
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _SPL_RWLOCK_H
#define _SPL_RWLOCK_H
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/rwsem.h>
#include <asm/current.h>
#include <sys/types.h>
#include <sys/kmem.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef enum {
RW_DRIVER = 2, /* driver (DDI) rwlock */
RW_DEFAULT = 4 /* kernel default rwlock */
} krw_type_t;
typedef enum {
RW_WRITER,
RW_READER
} krw_t;
#define RW_MAGIC 0x3423645a
#define RW_POISON 0xa6
typedef struct {
int32_t rw_magic;
int32_t rw_name_size;
char *rw_name;
struct rw_semaphore rw_sem;
struct task_struct *rw_owner; /* holder of the write lock */
} krwlock_t;
extern void __rw_init(krwlock_t *rwlp, char *name, krw_type_t type, void *arg);
extern void __rw_destroy(krwlock_t *rwlp);
extern int __rw_tryenter(krwlock_t *rwlp, krw_t rw);
extern void __rw_enter(krwlock_t *rwlp, krw_t rw);
extern void __rw_exit(krwlock_t *rwlp);
extern void __rw_downgrade(krwlock_t *rwlp);
extern int __rw_tryupgrade(krwlock_t *rwlp);
extern kthread_t *__rw_owner(krwlock_t *rwlp);
extern int __rw_read_held(krwlock_t *rwlp);
extern int __rw_write_held(krwlock_t *rwlp);
extern int __rw_lock_held(krwlock_t *rwlp);
#define rw_init(rwlp, name, type, arg) \
({ \
if ((name) == NULL) \
__rw_init(rwlp, #rwlp, type, arg); \
else \
__rw_init(rwlp, name, type, arg); \
})
#define rw_destroy(rwlp) __rw_destroy(rwlp)
#define rw_tryenter(rwlp, rw) __rw_tryenter(rwlp, rw)
#define rw_enter(rwlp, rw) __rw_enter(rwlp, rw)
#define rw_exit(rwlp) __rw_exit(rwlp)
#define rw_downgrade(rwlp) __rw_downgrade(rwlp)
#define rw_tryupgrade(rwlp) __rw_tryupgrade(rwlp)
#define rw_owner(rwlp) __rw_owner(rwlp)
#define RW_READ_HELD(rwlp) __rw_read_held(rwlp)
#define RW_WRITE_HELD(rwlp) __rw_write_held(rwlp)
#define RW_LOCK_HELD(rwlp) __rw_lock_held(rwlp)
#ifdef __cplusplus
}
#endif
#endif /* _SPL_RWLOCK_H */
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