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From: Pavel Begunkov <asml.silence@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>, io-uring@vger.kernel.org
Subject: [PATCH v2] /dev/mem: nowait zero/null ops
Date: Wed,  8 Sep 2021 20:10:38 +0100	[thread overview]
Message-ID: <f11090f97ddc2b2ce49ea1211258658ddfbc5563.1631127867.git.asml.silence@gmail.com> (raw)

Make read_iter_zero() to honor IOCB_NOWAIT, so /dev/zero can be
advertised as FMODE_NOWAIT. It's useful for io_uring, which needs it to
apply certain optimisations when doing I/O against the device.

Set FMODE_NOWAIT for /dev/null as well, it never waits and therefore
trivially meets the criteria.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---

v2:
Don't stop IOCB_NOWAIT read after first page (Jens)
Adjust commit message (following Greg's reply)

iterate nowait until exhausting 

 drivers/char/mem.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 1c596b5cdb27..cc296f0823bd 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -495,6 +495,10 @@ static ssize_t read_iter_zero(struct kiocb *iocb, struct iov_iter *iter)
 		written += n;
 		if (signal_pending(current))
 			return written ? written : -ERESTARTSYS;
+		if (!need_resched())
+			continue;
+		if (iocb->ki_flags & IOCB_NOWAIT)
+			return written ? written : -EAGAIN;
 		cond_resched();
 	}
 	return written;
@@ -696,11 +700,11 @@ static const struct memdev {
 #ifdef CONFIG_DEVMEM
 	 [DEVMEM_MINOR] = { "mem", 0, &mem_fops, FMODE_UNSIGNED_OFFSET },
 #endif
-	 [3] = { "null", 0666, &null_fops, 0 },
+	 [3] = { "null", 0666, &null_fops, FMODE_NOWAIT },
 #ifdef CONFIG_DEVPORT
 	 [4] = { "port", 0, &port_fops, 0 },
 #endif
-	 [5] = { "zero", 0666, &zero_fops, 0 },
+	 [5] = { "zero", 0666, &zero_fops, FMODE_NOWAIT },
 	 [7] = { "full", 0666, &full_fops, 0 },
 	 [8] = { "random", 0666, &random_fops, 0 },
 	 [9] = { "urandom", 0666, &urandom_fops, 0 },
-- 
2.33.0


             reply	other threads:[~2021-09-08 19:11 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08 19:10 Pavel Begunkov [this message]
2021-09-08 19:15 ` Jens Axboe

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