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block: Convert fifo_time from ulong to u64 

Currently rq->fifo_time is unsigned long but CFQ stores nanosecond
timestamp in it which would overflow on 32-bit archs. Convert it to u64
to avoid the overflow. Since the rq->fifo_time is unioned with struct
call_single_data(), this does not change the size of struct request in
any way.

We have to slightly fixup block/deadline-iosched.c so that comparison
happens in the right types.

Fixes: 9a7f38c42c
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara 2016-06-28 09:03:59 +02:00 committed by Jens Axboe
parent 59a37f8bae
commit 9828c2c6c1
2 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
block/deadline-iosched.c
View File

@ -173,7 +173,8 @@ deadline_merged_requests(struct request_queue *q, struct request *req,
* and move into next position (next will be deleted) in fifo
*/
if (!list_empty(&req->queuelist) && !list_empty(&next->queuelist)) {
if (time_before(next->fifo_time, req->fifo_time)) {
if (time_before((unsigned long)next->fifo_time,
(unsigned long)req->fifo_time)) {
list_move(&req->queuelist, &next->queuelist);
req->fifo_time = next->fifo_time;
}
@ -227,7 +228,7 @@ static inline int deadline_check_fifo(struct deadline_data *dd, int ddir)
/*
* rq is expired!
*/
if (time_after_eq(jiffies, rq->fifo_time))
if (time_after_eq(jiffies, (unsigned long)rq->fifo_time))
return 1;
return 0;

2
include/linux/blkdev.h
View File

@ -90,7 +90,7 @@ struct request {
struct list_head queuelist;
union {
struct call_single_data csd;
unsigned long fifo_time;
u64 fifo_time;
};
struct request_queue *q;