2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 #ifndef __XFS_SUPPORT_MRLOCK_H__
19 #define __XFS_SUPPORT_MRLOCK_H__
21 #include <linux/rwsem.h>
24 struct rw_semaphore mr_lock
;
31 #define mrinit(mrp, name) \
32 do { (mrp)->mr_writer = 0; init_rwsem(&(mrp)->mr_lock); } while (0)
34 #define mrinit(mrp, name) \
35 do { init_rwsem(&(mrp)->mr_lock); } while (0)
38 #define mrlock_init(mrp, t,n,s) mrinit(mrp, n)
39 #define mrfree(mrp) do { } while (0)
41 static inline void mraccess_nested(mrlock_t
*mrp
, int subclass
)
43 down_read_nested(&mrp
->mr_lock
, subclass
);
46 static inline void mrupdate_nested(mrlock_t
*mrp
, int subclass
)
48 down_write_nested(&mrp
->mr_lock
, subclass
);
54 static inline int mrtryaccess(mrlock_t
*mrp
)
56 return down_read_trylock(&mrp
->mr_lock
);
59 static inline int mrtryupdate(mrlock_t
*mrp
)
61 if (!down_write_trylock(&mrp
->mr_lock
))
69 static inline void mrunlock_excl(mrlock_t
*mrp
)
74 up_write(&mrp
->mr_lock
);
77 static inline void mrunlock_shared(mrlock_t
*mrp
)
79 up_read(&mrp
->mr_lock
);
82 static inline void mrdemote(mrlock_t
*mrp
)
87 downgrade_write(&mrp
->mr_lock
);
90 #endif /* __XFS_SUPPORT_MRLOCK_H__ */
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