From: Ye Bin yebin10@huawei.com

mainline inclusion from mainline-v6.1-rc2 commit 60a9bb9048f9e95029df10a9bc346f6b066c593c category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5Z7DK CVE: NA

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Introduce 'blk_trace_{start,stop}' helper. No functional changed.

Signed-off-by: Ye Bin yebin10@huawei.com Reviewed-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/20221019033602.752383-2-yebin@huaweicloud.com Signed-off-by: Jens Axboe axboe@kernel.dk

conflicts: kernel/trace/blktrace.c

Signed-off-by: Ye Bin yebin@huaweicloud.com Reviewed-by: Jason Yan yanaijie@huawei.com Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- kernel/trace/blktrace.c | 74 ++++++++++++++++++++--------------------- 1 file changed, 36 insertions(+), 38 deletions(-)

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index b1aa8c74442c..9cc04b09c42f 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -334,6 +334,37 @@ static void put_probe_ref(void) mutex_unlock(&blk_probe_mutex); }

+static int blk_trace_start(struct blk_trace *bt) +{ + if (bt->trace_state != Blktrace_setup && + bt->trace_state != Blktrace_stopped) + return -EINVAL; + + blktrace_seq++; + smp_mb(); + bt->trace_state = Blktrace_running; + spin_lock_irq(&running_trace_lock); + list_add(&bt->running_list, &running_trace_list); + spin_unlock_irq(&running_trace_lock); + trace_note_time(bt); + + return 0; +} + +static int blk_trace_stop(struct blk_trace *bt) +{ + if (bt->trace_state != Blktrace_running) + return -EINVAL; + + bt->trace_state = Blktrace_stopped; + spin_lock_irq(&running_trace_lock); + list_del_init(&bt->running_list); + spin_unlock_irq(&running_trace_lock); + relay_flush(bt->rchan); + + return 0; +} + static void blk_trace_cleanup(struct blk_trace *bt) { synchronize_rcu(); @@ -652,7 +683,6 @@ static int compat_blk_trace_setup(struct request_queue *q, char *name,

static int __blk_trace_startstop(struct request_queue *q, int start) { - int ret; struct blk_trace *bt;

bt = rcu_dereference_protected(q->blk_trace, @@ -660,36 +690,10 @@ static int __blk_trace_startstop(struct request_queue *q, int start) if (bt == NULL) return -EINVAL;

- /* - * For starting a trace, we can transition from a setup or stopped - * trace. For stopping a trace, the state must be running - */ - ret = -EINVAL; - if (start) { - if (bt->trace_state == Blktrace_setup || - bt->trace_state == Blktrace_stopped) { - blktrace_seq++; - smp_mb(); - bt->trace_state = Blktrace_running; - spin_lock_irq(&running_trace_lock); - list_add(&bt->running_list, &running_trace_list); - spin_unlock_irq(&running_trace_lock); - - trace_note_time(bt); - ret = 0; - } - } else { - if (bt->trace_state == Blktrace_running) { - bt->trace_state = Blktrace_stopped; - spin_lock_irq(&running_trace_lock); - list_del_init(&bt->running_list); - spin_unlock_irq(&running_trace_lock); - relay_flush(bt->rchan); - ret = 0; - } - } - - return ret; + if (start) + return blk_trace_start(bt); + else + return blk_trace_stop(bt); }

int blk_trace_startstop(struct request_queue *q, int start) @@ -1657,13 +1661,7 @@ static int blk_trace_remove_queue(struct request_queue *q) if (bt == NULL) return -EINVAL;

- if (bt->trace_state == Blktrace_running) { - bt->trace_state = Blktrace_stopped; - spin_lock_irq(&running_trace_lock); - list_del_init(&bt->running_list); - spin_unlock_irq(&running_trace_lock); - relay_flush(bt->rchan); - } + blk_trace_stop(bt);

put_probe_ref(); synchronize_rcu();