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authorJens Axboe <axboe@kernel.dk>2018-01-10 11:34:25 -0700
committerJens Axboe <axboe@kernel.dk>2018-01-10 11:47:53 -0700
commite14575b3d457f5806d79b85886ef94d9c29e3b2a (patch)
treebf1a6137b1e38ece55196da485e5c97bdc711ea4 /block
parent0a72e7f44964b9ada3e5c15820372e9cb119bf80 (diff)
downloadlinux-e14575b3d457f5806d79b85886ef94d9c29e3b2a.tar.bz2
block: convert REQ_ATOM_COMPLETE to stealing rq->__deadline bit
We only have one atomic flag left. Instead of using an entire unsigned long for that, steal the bottom bit of the deadline field that we already reserved. Remove ->atomic_flags, since it's now unused. Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c2
-rw-r--r--block/blk-mq-debugfs.c9
-rw-r--r--block/blk-mq.c2
-rw-r--r--block/blk.h19
4 files changed, 12 insertions, 20 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index f843ae4f858d..7ba607527487 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2853,7 +2853,7 @@ void blk_start_request(struct request *req)
wbt_issue(req->q->rq_wb, &req->issue_stat);
}
- BUG_ON(test_bit(REQ_ATOM_COMPLETE, &req->atomic_flags));
+ BUG_ON(blk_rq_is_complete(req));
blk_add_timer(req);
}
EXPORT_SYMBOL(blk_start_request);
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index dd890d5e0fbd..19db3f583bf1 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -294,12 +294,6 @@ static const char *const rqf_name[] = {
};
#undef RQF_NAME
-#define RQAF_NAME(name) [REQ_ATOM_##name] = #name
-static const char *const rqaf_name[] = {
- RQAF_NAME(COMPLETE),
-};
-#undef RQAF_NAME
-
int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
{
const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
@@ -316,8 +310,7 @@ int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
seq_puts(m, ", .rq_flags=");
blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
ARRAY_SIZE(rqf_name));
- seq_puts(m, ", .atomic_flags=");
- blk_flags_show(m, rq->atomic_flags, rqaf_name, ARRAY_SIZE(rqaf_name));
+ seq_printf(m, ", complete=%d", blk_rq_is_complete(rq));
seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
rq->internal_tag);
if (mq_ops->show_rq)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 7035c305be45..87e6b10c8ecb 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -294,7 +294,6 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
rq->rq_flags |= RQF_PREEMPT;
if (blk_queue_io_stat(data->q))
rq->rq_flags |= RQF_IO_STAT;
- /* do not touch atomic flags, it needs atomic ops against the timer */
rq->cpu = -1;
INIT_HLIST_NODE(&rq->hash);
RB_CLEAR_NODE(&rq->rb_node);
@@ -313,6 +312,7 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
rq->special = NULL;
/* tag was already set */
rq->extra_len = 0;
+ rq->__deadline = 0;
INIT_LIST_HEAD(&rq->timeout_list);
rq->timeout = 0;
diff --git a/block/blk.h b/block/blk.h
index bcd9cf7db0d4..c84ae0e21ebd 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -120,24 +120,23 @@ void blk_account_io_completion(struct request *req, unsigned int bytes);
void blk_account_io_done(struct request *req);
/*
- * Internal atomic flags for request handling
- */
-enum rq_atomic_flags {
- REQ_ATOM_COMPLETE = 0,
-};
-
-/*
* EH timer and IO completion will both attempt to 'grab' the request, make
- * sure that only one of them succeeds
+ * sure that only one of them succeeds. Steal the bottom bit of the
+ * __deadline field for this.
*/
static inline int blk_mark_rq_complete(struct request *rq)
{
- return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
+ return test_and_set_bit(0, &rq->__deadline);
}
static inline void blk_clear_rq_complete(struct request *rq)
{
- clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
+ clear_bit(0, &rq->__deadline);
+}
+
+static inline bool blk_rq_is_complete(struct request *rq)
+{
+ return test_bit(0, &rq->__deadline);
}
/*