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[XFS] Kill direct access to ->count in valusema(); all we ever use it for

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is check if semaphore is actually locked, which can be trivially done in
portable way. Code gets more reabable, while we are at it... 

SGI-PV: 953915
SGI-Modid: xfs-linux-melb:xfs-kern:26274a

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Al Viro
2006-06-19 08:41:30 +10:00
committed by Nathan Scott
parent a805bad5da
commit 0d8fee3270
6 changed files with 20 additions and 19 deletions
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19
fs/xfs/linux-2.6/sema.h
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@ -34,20 +34,21 @@ typedef struct semaphore sema_t;
#define initnsema(sp, val, name) sema_init(sp, val)
#define psema(sp, b) down(sp)
#define vsema(sp) up(sp)
#define valusema(sp) (atomic_read(&(sp)->count))
#define freesema(sema)
#define freesema(sema) do { } while (0)
static inline int issemalocked(sema_t *sp)
{
return down_trylock(sp) || (up(sp), 0);
}
/*
* Map cpsema (try to get the sema) to down_trylock. We need to switch
* the return values since cpsema returns 1 (acquired) 0 (failed) and
* down_trylock returns the reverse 0 (acquired) 1 (failed).
*/
#define cpsema(sp) (down_trylock(sp) ? 0 : 1)
/*
* Didn't do cvsema(sp). Not sure how to map this to up/down/...
* It does a vsema if the values is < 0 other wise nothing.
*/
static inline int cpsema(sema_t *sp)
{
return down_trylock(sp) ? 0 : 1;
}
#endif /* __XFS_SUPPORT_SEMA_H__ */