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sunrpc: use seconds since boot in expiry cache

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This protects us from confusion when the wallclock time changes.

We convert to and from wallclock when  setting or reading expiry
times.

Also use seconds since boot for last_clost time.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
NeilBrown 2010-08-12 16:55:22 +10:00 • committed by J. Bruce Fields
parent 17cebf658e
commit c5b29f885a
4 changed files with 48 additions and 24 deletions
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28
include/linux/sunrpc/cache.h
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@ -218,20 +218,42 @@ static inline int get_int(char **bpp, int *anint)
return 0;
}
/*
* timestamps kept in the cache are expressed in seconds
* since boot. This is the best for measuring differences in
* real time.
*/
static inline time_t seconds_since_boot(void)
{
struct timespec boot;
getboottime(&boot);
return get_seconds() - boot.tv_sec;
}
static inline time_t convert_to_wallclock(time_t sinceboot)
{
struct timespec boot;
getboottime(&boot);
return boot.tv_sec + sinceboot;
}
static inline time_t get_expiry(char **bpp)
{
int rv;
struct timespec boot;
if (get_int(bpp, &rv))
return 0;
if (rv < 0)
return 0;
return rv;
getboottime(&boot);
return rv - boot.tv_sec;
}
static inline void sunrpc_invalidate(struct cache_head *h,
struct cache_detail *detail)
{
h->expiry_time = get_seconds() - 1;
detail->nextcheck = get_seconds();
h->expiry_time = seconds_since_boot() - 1;
detail->nextcheck = seconds_since_boot();
}
#endif /* _LINUX_SUNRPC_CACHE_H_ */