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authorIlya Dryomov <idryomov@gmail.com>2017-01-31 15:55:06 +0100
committerIlya Dryomov <idryomov@gmail.com>2017-02-20 12:16:11 +0100
commit743efcffffc6620ab44ea9ec67c7e4e28dfa7742 (patch)
treea087b21bd95308161d8b14269452efd1e798949d /include/linux/crush
parent66a0e2d579dbec5c676cfe446234ffebb267c564 (diff)
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crush: merge working data and scratch
Much like Arlo Guthrie, I decided that one big pile is better than two little piles. Reflects ceph.git commit 95c2df6c7e0b22d2ea9d91db500cf8b9441c73ba. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'include/linux/crush')
-rw-r--r--include/linux/crush/mapper.h14
1 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/crush/mapper.h b/include/linux/crush/mapper.h
index 3303c7fd8a31..c95e19e1ff11 100644
--- a/include/linux/crush/mapper.h
+++ b/include/linux/crush/mapper.h
@@ -15,7 +15,19 @@ extern int crush_do_rule(const struct crush_map *map,
int ruleno,
int x, int *result, int result_max,
const __u32 *weights, int weight_max,
- void *cwin, int *scratch);
+ void *cwin);
+
+/*
+ * Returns the exact amount of workspace that will need to be used
+ * for a given combination of crush_map and result_max. The caller can
+ * then allocate this much on its own, either on the stack, in a
+ * per-thread long-lived buffer, or however it likes.
+ */
+static inline size_t crush_work_size(const struct crush_map *map,
+ int result_max)
+{
+ return map->working_size + result_max * 3 * sizeof(__u32);
+}
void crush_init_workspace(const struct crush_map *map, void *v);