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#ifndef __XFS_SUPPORT_MRLOCK_H__
#define __XFS_SUPPORT_MRLOCK_H__
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sx.h>
#include <support/debug.h>
/*
* Implement mrlocks on FreeBSD that work for XFS.
* Use FreeBSD sx lock and add necessary functions
* if additional functionality is requested
*/
typedef struct sx mrlock_t;
#define MR_ACCESS 1
#define MR_UPDATE 2
/*
* Compatibility defines, not really used
*/
#define MRLOCK_BARRIER 0x1
#define MRLOCK_ALLOW_EQUAL_PRI 0x8
/*
* mraccessf/mrupdatef take flags to be passed in while sleeping;
* only PLTWAIT is currently supported.
*/
#define mrinit(lock, name) sx_init(lock, name)
#define mrlock_init(lock, type, name, seq) sx_init(lock, name)
#define mrfree(lock) _sx_xfs_destroy(lock)
#define mraccessf(lock, f) sx_slock(lock)
#define mrupdatef(lock, f) sx_xlock(lock)
#define mraccunlock(lock) sx_sunlock(lock)
#define mrtryaccess(lock) sx_try_slock(lock)
#define mrtryupdate(lock) sx_try_xlock(lock)
#define mraccess(mrp) mraccessf(mrp, 0)
#define mrupdate(mrp) mrupdatef(mrp, 0)
#define mrislocked_access(lock) _sx_xfs_xowned(lock)
#define mrislocked_update(lock) _sx_xfs_sowned(lock)
#define mrtrypromote(lock) sx_try_upgrade(lock)
#define mrdemote(lock) sx_downgrade(lock)
int ismrlocked(mrlock_t *, int);
void _sx_xfs_lock(struct sx *sx, int type, const char *file, int line);
void _sx_xfs_unlock(struct sx *sx, const char *file, int line);
void _sx_xfs_destroy(struct sx *sx);
#define _sx_xfs_xowned(lock) ((lock)->sx_cnt < 0)
#define _sx_xfs_sowned(lock) ((lock)->sx_cnt > 0)
/*
* Functions, not implemented in FreeBSD
*/
#define mrunlock(lock) \
_sx_xfs_unlock(lock, __FILE__, __LINE__)
#define mrlock(lock, type, flags) \
_sx_xfs_lock(lock, type, __FILE__, __LINE__)
#endif /* __XFS_SUPPORT_MRLOCK_H__ */
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