diff options
| author | Jens Axboe <axboe@kernel.dk> | 2021-08-12 20:42:53 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-08-23 22:45:15 +0300 |
| commit | 270a1c913ebd745ebee716af5f7215e1c2b30cc0 (patch) | |
| tree | d1cc0c8163721a335687aac07d14a401df439fd2 | |
| parent | 01cfa28af486c9df3775232f10c3dd7ba2e88318 (diff) | |
| download | linux-270a1c913ebd745ebee716af5f7215e1c2b30cc0.tar.xz | |
block: provide bio_clear_hipri() helper
Any case that turns off REQ_HIPRI must also clear BIO_PERCPU_CACHE,
as non-polled IO may complete through hard/soft IRQ and hence isn't
safe for our polled bio alloc cache.
Provide a helper that does just that, and use it in the merging code as
well if we split a bio and turn off polling.
Fixes: be863b9e4348 ("block: clear BIO_PERCPU_CACHE flag if polling isn't supported")
Reported-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | block/blk-core.c | 7 | ||||
| -rw-r--r-- | block/blk-merge.c | 2 | ||||
| -rw-r--r-- | block/blk.h | 7 |
3 files changed, 10 insertions, 6 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 0d4d6b1e5d25..f35d401e65f8 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -832,11 +832,8 @@ static noinline_for_stack bool submit_bio_checks(struct bio *bio) } } - if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) { - /* can't support alloc cache if we turn off polling */ - bio_clear_flag(bio, BIO_PERCPU_CACHE); - bio->bi_opf &= ~REQ_HIPRI; - } + if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) + bio_clear_hipri(bio); switch (bio_op(bio)) { case REQ_OP_DISCARD: diff --git a/block/blk-merge.c b/block/blk-merge.c index a11b3b53717e..bc25ad409fc1 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -285,7 +285,7 @@ split: * iopoll in direct IO routine. Given performance gain of iopoll for * big IO can be trival, disable iopoll when split needed. */ - bio->bi_opf &= ~REQ_HIPRI; + bio_clear_hipri(bio); return bio_split(bio, sectors, GFP_NOIO, bs); } diff --git a/block/blk.h b/block/blk.h index cb01429c162c..5a4652a10931 100644 --- a/block/blk.h +++ b/block/blk.h @@ -364,4 +364,11 @@ extern struct device_attribute dev_attr_events; extern struct device_attribute dev_attr_events_async; extern struct device_attribute dev_attr_events_poll_msecs; +static inline void bio_clear_hipri(struct bio *bio) +{ + /* can't support alloc cache if we turn off polling */ + bio_clear_flag(bio, BIO_PERCPU_CACHE); + bio->bi_opf &= ~REQ_HIPRI; +} + #endif /* BLK_INTERNAL_H */ |