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authorLinus Torvalds <torvalds@linux-foundation.org>2020-02-28 11:43:30 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-02-28 11:43:30 -0800
commit2edc78b9a4b868d7bfee4f87ea29f2df19b6e955 (patch)
treee719289213d2691ad2a89a9576f72e9b670cbf74 /include
parentMerge tag 'io_uring-5.6-2020-02-28' of git://git.kernel.dk/linux-block (diff)
parentMerge branch 'nvme-5.6-rc4' of git://git.infradead.org/nvme into block-5.6 (diff)
downloadlinux-dev-2edc78b9a4b868d7bfee4f87ea29f2df19b6e955.tar.xz
linux-dev-2edc78b9a4b868d7bfee4f87ea29f2df19b6e955.zip
Merge tag 'block-5.6-2020-02-28' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe: - Passthrough insertion fix (Ming) - Kill off some unused arguments (John) - blktrace RCU fix (Jan) - Dead fields removal for null_blk (Dongli) - NVMe polled IO fix (Bijan) * tag 'block-5.6-2020-02-28' of git://git.kernel.dk/linux-block: nvme-pci: Hold cq_poll_lock while completing CQEs blk-mq: Remove some unused function arguments null_blk: remove unused fields in 'nullb_cmd' blktrace: Protect q->blk_trace with RCU blk-mq: insert passthrough request into hctx->dispatch directly
Diffstat (limited to 'include')
-rw-r--r--include/linux/blkdev.h2
-rw-r--r--include/linux/blktrace_api.h18
2 files changed, 14 insertions, 6 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 053ea4b51988..10455b2bbbb4 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -524,7 +524,7 @@ struct request_queue {
unsigned int sg_reserved_size;
int node;
#ifdef CONFIG_BLK_DEV_IO_TRACE
- struct blk_trace *blk_trace;
+ struct blk_trace __rcu *blk_trace;
struct mutex blk_trace_mutex;
#endif
/*
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index 7bb2d8de9f30..3b6ff5902edc 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -51,9 +51,13 @@ void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, const char *f
**/
#define blk_add_cgroup_trace_msg(q, cg, fmt, ...) \
do { \
- struct blk_trace *bt = (q)->blk_trace; \
+ struct blk_trace *bt; \
+ \
+ rcu_read_lock(); \
+ bt = rcu_dereference((q)->blk_trace); \
if (unlikely(bt)) \
__trace_note_message(bt, cg, fmt, ##__VA_ARGS__);\
+ rcu_read_unlock(); \
} while (0)
#define blk_add_trace_msg(q, fmt, ...) \
blk_add_cgroup_trace_msg(q, NULL, fmt, ##__VA_ARGS__)
@@ -61,10 +65,14 @@ void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, const char *f
static inline bool blk_trace_note_message_enabled(struct request_queue *q)
{
- struct blk_trace *bt = q->blk_trace;
- if (likely(!bt))
- return false;
- return bt->act_mask & BLK_TC_NOTIFY;
+ struct blk_trace *bt;
+ bool ret;
+
+ rcu_read_lock();
+ bt = rcu_dereference(q->blk_trace);
+ ret = bt && (bt->act_mask & BLK_TC_NOTIFY);
+ rcu_read_unlock();
+ return ret;
}
extern void blk_add_driver_data(struct request_queue *q, struct request *rq,