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authorJens Axboe <axboe@kernel.dk>2021-08-12 11:42:53 -0600
committerJens Axboe <axboe@kernel.dk>2021-08-23 13:45:15 -0600
commit270a1c913ebd745ebee716af5f7215e1c2b30cc0 (patch)
treed1cc0c8163721a335687aac07d14a401df439fd2 /block
parentblock: use the percpu bio cache in __blkdev_direct_IO (diff)
downloadwireguard-linux-270a1c913ebd745ebee716af5f7215e1c2b30cc0.tar.xz
wireguard-linux-270a1c913ebd745ebee716af5f7215e1c2b30cc0.zip
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>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c7
-rw-r--r--block/blk-merge.c2
-rw-r--r--block/blk.h7
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 */