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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/sx.h>
/*
* Implement mrlocks on FreeBSD that work for XFS.
* Map mrlock functions to corresponding equivalents in
* sx.
*/
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
#define mrlock_init(lock, type, name, seq) sx_init(lock, name)
#define mrtryaccess(lock) sx_try_slock(lock)
#define mrtryupdate(lock) sx_try_xlock(lock)
#define mraccess(lock) sx_slock(lock)
#define mrupdate(lock) sx_xlock(lock)
#define mrdemote(lock) sx_downgrade(lock)
#define mrunlock(lock) sx_unlock(lock)
#define mrfree(lock) do { \
if (sx_xlocked(lock)) \
sx_xunlock(lock); \
sx_destroy(lock); \
} while (0)
int ismrlocked(mrlock_t *mrp, int type);
#endif /* __XFS_SUPPORT_MRLOCK_H__ */
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