Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
SUNRPC: introduce cache_check_rcu to help check in rcu context
This is a prepare patch to add cache_check_rcu, will use it with follow
patch.
Suggested-by: NeilBrown <neilb@suse.de>
Signed-off-by: Yang Erkun <yangerkun@huawei.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
authored by
Yang Erkun
and committed by
Chuck Lever
2f55dbe4
cb80ecf7
+28
-15
+2
include/linux/sunrpc/cache.h
+2
include/linux/sunrpc/cache.h
···
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return detail->flush_time >= h->last_refresh;
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}
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+
extern int cache_check_rcu(struct cache_detail *detail,
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struct cache_head *h, struct cache_req *rqstp);
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extern int cache_check(struct cache_detail *detail,
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struct cache_head *h, struct cache_req *rqstp);
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extern void cache_flush(void);
+26
-15
net/sunrpc/cache.c
+26
-15
net/sunrpc/cache.c
···
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return rv;
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}
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-
/*
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* This is the generic cache management routine for all
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* the authentication caches.
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* It checks the currency of a cache item and will (later)
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* initiate an upcall to fill it if needed.
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*
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*
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* Returns 0 if the cache_head can be used, or cache_puts it and returns
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* -EAGAIN if upcall is pending and request has been queued
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* -ETIMEDOUT if upcall failed or request could not be queue or
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* upcall completed but item is still invalid (implying that
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* the cache item has been replaced with a newer one).
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* -ENOENT if cache entry was negative
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*/
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-
int cache_check(struct cache_detail *detail,
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int cache_check_rcu(struct cache_detail *detail,
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struct cache_head *h, struct cache_req *rqstp)
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{
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int rv;
···
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rv = -ETIMEDOUT;
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}
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}
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+
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return rv;
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}
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EXPORT_SYMBOL_GPL(cache_check_rcu);
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+
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/*
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* This is the generic cache management routine for all
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* the authentication caches.
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* It checks the currency of a cache item and will (later)
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+
* initiate an upcall to fill it if needed.
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*
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*
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* Returns 0 if the cache_head can be used, or cache_puts it and returns
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+
* -EAGAIN if upcall is pending and request has been queued
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* -ETIMEDOUT if upcall failed or request could not be queue or
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* upcall completed but item is still invalid (implying that
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+
* the cache item has been replaced with a newer one).
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* -ENOENT if cache entry was negative
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*/
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+
int cache_check(struct cache_detail *detail,
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struct cache_head *h, struct cache_req *rqstp)
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{
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int rv;
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+
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rv = cache_check_rcu(detail, h, rqstp);
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if (rv)
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cache_put(h, detail);
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return rv;