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authorLars Ellenberg <lars.ellenberg@linbit.com>2013-03-22 22:17:36 -0600
committerJens Axboe <axboe@kernel.dk>2013-03-22 22:17:36 -0600
commitcbe5e6109538ddab57764a88d9f0c2accd0c7d48 (patch)
treee09809862b9be7a44b44aa7367d470da14b2ccf0 /include/linux/lru_cache.h
parent779b3fe4c0e9dea19ae3ddef0b5fd1a663b63ee6 (diff)
lru_cache: introduce lc_get_cumulative()
New helper to be able to consolidate more updates into a single transaction. Without this, we can only grab a single refcount on an updated element while preparing a transaction. lc_get_cumulative - like lc_get; also finds to-be-changed elements @lc: the lru cache to operate on @enr: the label to look up Unlike lc_get this also returns the element for @enr, if it is belonging to a pending transaction, so the return values are like for lc_get(), plus: pointer to an element already on the "to_be_changed" list. In this case, the cache was already marked %LC_DIRTY. Caller needs to make sure that the pending transaction is completed, before proceeding to actually use this element. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Fixed up by Jens to export lc_get_cumulative(). Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/lru_cache.h')
-rw-r--r--include/linux/lru_cache.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/lru_cache.h b/include/linux/lru_cache.h
index 4019013c6593..46262284de47 100644
--- a/include/linux/lru_cache.h
+++ b/include/linux/lru_cache.h
@@ -256,6 +256,7 @@ extern void lc_destroy(struct lru_cache *lc);
extern void lc_set(struct lru_cache *lc, unsigned int enr, int index);
extern void lc_del(struct lru_cache *lc, struct lc_element *element);
+extern struct lc_element *lc_get_cumulative(struct lru_cache *lc, unsigned int enr);
extern struct lc_element *lc_try_get(struct lru_cache *lc, unsigned int enr);
extern struct lc_element *lc_find(struct lru_cache *lc, unsigned int enr);
extern struct lc_element *lc_get(struct lru_cache *lc, unsigned int enr);