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author | Jens Axboe <axboe@suse.de> | 2006-07-11 21:49:15 +0200 |
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committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2006-09-30 20:26:59 +0200 |
commit | 1fbfdfcddff4df188b24d9d05271a76a85064583 (patch) | |
tree | b975a9e9ea5a20750b14ae593eca1d9b2609c29d /include/linux/elevator.h | |
parent | b8aca35af5e9fbc2e41a3ba1b2e66f24e80ca9b6 (diff) | |
download | linux-stable-1fbfdfcddff4df188b24d9d05271a76a85064583.tar.gz linux-stable-1fbfdfcddff4df188b24d9d05271a76a85064583.tar.bz2 linux-stable-1fbfdfcddff4df188b24d9d05271a76a85064583.zip |
[PATCH] elevator: introduce a way to reuse rq for internal FIFO handling
The io schedulers can use this instead of having to allocate space for
it themselves.
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'include/linux/elevator.h')
-rw-r--r-- | include/linux/elevator.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h index 95b2a04b969c..0e7b1a733919 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -166,4 +166,16 @@ enum { #define rq_end_sector(rq) ((rq)->sector + (rq)->nr_sectors) #define rb_entry_rq(node) rb_entry((node), struct request, rb_node) +/* + * Hack to reuse the donelist list_head as the fifo time holder while + * the request is in the io scheduler. Saves an unsigned long in rq. + */ +#define rq_fifo_time(rq) ((unsigned long) (rq)->donelist.next) +#define rq_set_fifo_time(rq,exp) ((rq)->donelist.next = (void *) (exp)) +#define rq_entry_fifo(ptr) list_entry((ptr), struct request, queuelist) +#define rq_fifo_clear(rq) do { \ + list_del_init(&(rq)->queuelist); \ + INIT_LIST_HEAD(&(rq)->donelist); \ + } while (0) + #endif |