linux-kernel - [PATCH v9 3/8] block: Add bdev atomic write limits helpers

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Message-Id: <20241016100325.3534494-4-john.g.garry@oracle.com>
Date: Wed, 16 Oct 2024 10:03:20 +0000
From: John Garry <john.g.garry@...cle.com>
To: axboe@...nel.dk, brauner@...nel.org, djwong@...nel.org,
        viro@...iv.linux.org.uk, jack@...e.cz, dchinner@...hat.com, hch@....de,
        cem@...nel.org
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, hare@...e.de,
        martin.petersen@...cle.com, catherine.hoang@...cle.com,
        mcgrof@...nel.org, ritesh.list@...il.com, ojaswin@...ux.ibm.com,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH v9 3/8] block: Add bdev atomic write limits helpers

Add helpers to get atomic write limits for a bdev, so that we don't access
request_queue helpers outside the block layer.

We check if the bdev can actually atomic write in these helpers, so we
can avoid users missing using this check.

Suggested-by: Christoph Hellwig <hch@....de>
Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 include/linux/blkdev.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 50c3b959da28..c2cc3c146d74 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1674,6 +1674,22 @@ static inline bool bdev_can_atomic_write(struct block_device *bdev)
 	return true;
 }
 
+static inline unsigned int
+bdev_atomic_write_unit_min_bytes(struct block_device *bdev)
+{
+	if (!bdev_can_atomic_write(bdev))
+		return 0;
+	return queue_atomic_write_unit_min_bytes(bdev_get_queue(bdev));
+}
+
+static inline unsigned int
+bdev_atomic_write_unit_max_bytes(struct block_device *bdev)
+{
+	if (!bdev_can_atomic_write(bdev))
+		return 0;
+	return queue_atomic_write_unit_max_bytes(bdev_get_queue(bdev));
+}
+
 #define DEFINE_IO_COMP_BATCH(name)	struct io_comp_batch name = { }
 
 #endif /* _LINUX_BLKDEV_H */
-- 
2.31.1