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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#ifndef __XFS_SUPPORT_MRLOCK_H__
#define __XFS_SUPPORT_MRLOCK_H__
#include <linux/rwsem.h>
typedef struct {
struct rw_semaphore mr_lock;
#if defined(DEBUG) || defined(XFS_WARN)
int mr_writer;
#endif
} mrlock_t;
#if defined(DEBUG) || defined(XFS_WARN)
#define mrinit(mrp, name) \
do { (mrp)->mr_writer = 0; init_rwsem(&(mrp)->mr_lock); } while (0)
#else
#define mrinit(mrp, name) \
do { init_rwsem(&(mrp)->mr_lock); } while (0)
#endif
#define mrlock_init(mrp, t,n,s) mrinit(mrp, n)
#define mrfree(mrp) do { } while (0)
static inline void mraccess_nested(mrlock_t *mrp, int subclass)
{
down_read_nested(&mrp->mr_lock, subclass);
}
static inline void mrupdate_nested(mrlock_t *mrp, int subclass)
{
down_write_nested(&mrp->mr_lock, subclass);
#if defined(DEBUG) || defined(XFS_WARN)
mrp->mr_writer = 1;
#endif
}
static inline int mrtryaccess(mrlock_t *mrp)
{
return down_read_trylock(&mrp->mr_lock);
}
static inline int mrtryupdate(mrlock_t *mrp)
{
if (!down_write_trylock(&mrp->mr_lock))
return 0;
#if defined(DEBUG) || defined(XFS_WARN)
mrp->mr_writer = 1;
#endif
return 1;
}
static inline void mrunlock_excl(mrlock_t *mrp)
{
#if defined(DEBUG) || defined(XFS_WARN)
mrp->mr_writer = 0;
#endif
up_write(&mrp->mr_lock);
}
static inline void mrunlock_shared(mrlock_t *mrp)
{
up_read(&mrp->mr_lock);
}
static inline void mrdemote(mrlock_t *mrp)
{
#if defined(DEBUG) || defined(XFS_WARN)
mrp->mr_writer = 0;
#endif
downgrade_write(&mrp->mr_lock);
}
#endif /* __XFS_SUPPORT_MRLOCK_H__ */
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