From d24de76af836260a99ca2ba281a937bd5bc55591 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 3 Jun 2020 07:14:43 +0200 Subject: block: remove the error argument to the block_bio_complete tracepoint The status can be trivially derived from the bio itself. That also avoid callers like NVMe to incorrectly pass a blk_status_t instead of the errno, and the overhead of translating the blk_status_t to the errno in the I/O completion fast path when no tracing is enabled. Fixes: 35fe0d12c8a3 ("nvme: trace bio completion") Signed-off-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Reviewed-by: Chaitanya Kulkarni Signed-off-by: Jens Axboe --- kernel/trace/blktrace.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'kernel/trace') diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index ea47f2084087..1e5499414cdf 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -885,10 +885,10 @@ static void blk_add_trace_bio_bounce(void *ignore, } static void blk_add_trace_bio_complete(void *ignore, - struct request_queue *q, struct bio *bio, - int error) + struct request_queue *q, struct bio *bio) { - blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error); + blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, + blk_status_to_errno(bio->bi_status)); } static void blk_add_trace_bio_backmerge(void *ignore, -- cgit v1.2.3 From 48bc3cd3e07a1486f45d9971c75d6090976c3b1b Mon Sep 17 00:00:00 2001 From: Chaitanya Kulkarni Date: Thu, 4 Jun 2020 00:13:28 -0700 Subject: blktrace: use errno instead of bi_status In blk_add_trace_spliti() blk_add_trace_bio_remap() use blk_status_to_errno() to pass the error instead of pasing the bi_status. This fixes the sparse warning. Signed-off-by: Chaitanya Kulkarni Signed-off-by: Jens Axboe --- kernel/trace/blktrace.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'kernel/trace') diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 1e5499414cdf..e2013bd0e2a6 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -995,8 +995,10 @@ static void blk_add_trace_split(void *ignore, __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, bio_op(bio), bio->bi_opf, - BLK_TA_SPLIT, bio->bi_status, sizeof(rpdu), - &rpdu, blk_trace_bio_get_cgid(q, bio)); + BLK_TA_SPLIT, + blk_status_to_errno(bio->bi_status), + sizeof(rpdu), &rpdu, + blk_trace_bio_get_cgid(q, bio)); } rcu_read_unlock(); } @@ -1033,7 +1035,8 @@ static void blk_add_trace_bio_remap(void *ignore, r.sector_from = cpu_to_be64(from); __blk_add_trace(bt, bio->bi_iter.bi_sector, bio->bi_iter.bi_size, - bio_op(bio), bio->bi_opf, BLK_TA_REMAP, bio->bi_status, + bio_op(bio), bio->bi_opf, BLK_TA_REMAP, + blk_status_to_errno(bio->bi_status), sizeof(r), &r, blk_trace_bio_get_cgid(q, bio)); rcu_read_unlock(); } -- cgit v1.2.3 From 71df3fd82e7cccec7b749a8607a4662d9f7febdd Mon Sep 17 00:00:00 2001 From: Chaitanya Kulkarni Date: Thu, 4 Jun 2020 00:13:29 -0700 Subject: blktrace: fix endianness in get_pdu_int() In function get_pdu_len() replace variable type from __u64 to __be64. This fixes sparse warning. Signed-off-by: Chaitanya Kulkarni Signed-off-by: Jens Axboe --- kernel/trace/blktrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel/trace') diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index e2013bd0e2a6..f857b4684beb 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -1256,7 +1256,7 @@ static inline __u16 t_error(const struct trace_entry *ent) static __u64 get_pdu_int(const struct trace_entry *ent, bool has_cg) { - const __u64 *val = pdu_start(ent, has_cg); + const __be64 *val = pdu_start(ent, has_cg); return be64_to_cpu(*val); } -- cgit v1.2.3 From 5aec598c456fe3c1b71a1202cbb42bdc2a643277 Mon Sep 17 00:00:00 2001 From: Chaitanya Kulkarni Date: Thu, 4 Jun 2020 00:13:30 -0700 Subject: blktrace: fix endianness for blk_log_remap() The function blk_log_remap() can be simplified by removing the call to get_pdu_remap() that copies the values into extra variable to print the data, which also fixes the endiannness warning reported by sparse. Signed-off-by: Chaitanya Kulkarni Signed-off-by: Jens Axboe --- kernel/trace/blktrace.c | 19 ++++--------------- 1 file changed, 4 insertions(+), 15 deletions(-) (limited to 'kernel/trace') diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index f857b4684beb..5773f0ba7e76 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -1260,17 +1260,6 @@ static __u64 get_pdu_int(const struct trace_entry *ent, bool has_cg) return be64_to_cpu(*val); } -static void get_pdu_remap(const struct trace_entry *ent, - struct blk_io_trace_remap *r, bool has_cg) -{ - const struct blk_io_trace_remap *__r = pdu_start(ent, has_cg); - __u64 sector_from = __r->sector_from; - - r->device_from = be32_to_cpu(__r->device_from); - r->device_to = be32_to_cpu(__r->device_to); - r->sector_from = be64_to_cpu(sector_from); -} - typedef void (blk_log_action_t) (struct trace_iterator *iter, const char *act, bool has_cg); @@ -1410,13 +1399,13 @@ static void blk_log_with_error(struct trace_seq *s, static void blk_log_remap(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) { - struct blk_io_trace_remap r = { .device_from = 0, }; + const struct blk_io_trace_remap *__r = pdu_start(ent, has_cg); - get_pdu_remap(ent, &r, has_cg); trace_seq_printf(s, "%llu + %u <- (%d,%d) %llu\n", t_sector(ent), t_sec(ent), - MAJOR(r.device_from), MINOR(r.device_from), - (unsigned long long)r.sector_from); + MAJOR(be32_to_cpu(__r->device_from)), + MINOR(be32_to_cpu(__r->device_from)), + be64_to_cpu(__r->sector_from)); } static void blk_log_plug(struct trace_seq *s, const struct trace_entry *ent, bool has_cg) -- cgit v1.2.3