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authorTejun Heo <tj@kernel.org>2011-12-14 00:33:42 +0100
committerJens Axboe <axboe@kernel.dk>2011-12-14 00:33:42 +0100
commit3d3c2379feb177a5fd55bb0ed76776dc9d4f3243 (patch)
treefafebbef8f0fb5b73ac4db24bff20dcd40b8bf12 /include/linux/elevator.h
parent47fdd4ca96bf4b28ac4d05d7a6e382df31d3d758 (diff)
block, cfq: move icq cache management to block core
Let elevators set ->icq_size and ->icq_align in elevator_type and elv_register() and elv_unregister() respectively create and destroy kmem_cache for icq. * elv_register() now can return failure. All callers updated. * icq caches are automatically named "ELVNAME_io_cq". * cfq_slab_setup/kill() are collapsed into cfq_init/exit(). * While at it, minor indentation change for iosched_cfq.elevator_name for consistency. This will help moving icq management to block core. This doesn't introduce any functional change. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/elevator.h')
-rw-r--r--include/linux/elevator.h11
1 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h
index 04958ef53e62..d3d3e28cbfd4 100644
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -78,10 +78,19 @@ struct elv_fs_entry {
*/
struct elevator_type
{
+ /* managed by elevator core */
+ struct kmem_cache *icq_cache;
+
+ /* fields provided by elevator implementation */
struct elevator_ops ops;
+ size_t icq_size;
+ size_t icq_align;
struct elv_fs_entry *elevator_attrs;
char elevator_name[ELV_NAME_MAX];
struct module *elevator_owner;
+
+ /* managed by elevator core */
+ char icq_cache_name[ELV_NAME_MAX + 5]; /* elvname + "_io_cq" */
struct list_head list;
};
@@ -127,7 +136,7 @@ extern void elv_drain_elevator(struct request_queue *);
/*
* io scheduler registration
*/
-extern void elv_register(struct elevator_type *);
+extern int elv_register(struct elevator_type *);
extern void elv_unregister(struct elevator_type *);
/*