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>
}
}
- 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:
* 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);
}
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 */