linux-kernel - [PATCH v2 6/8] docs: sysfs-block: document virt_boundary

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Message-Id: <20211208005640.102814-7-ebiggers@kernel.org>
Date:   Tue,  7 Dec 2021 16:56:38 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-block@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Cc:     linux-doc@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...e.de>
Subject: [PATCH v2 6/8] docs: sysfs-block: document virt_boundary_mask

From: Eric Biggers <ebiggers@...gle.com>

/sys/block/<disk>/queue/virt_boundary_mask is completely undocumented.
Document it.

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 Documentation/ABI/stable/sysfs-block | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block
index 30ce8dc587bb2..e988742a54a4c 100644
--- a/Documentation/ABI/stable/sysfs-block
+++ b/Documentation/ABI/stable/sysfs-block
@@ -537,6 +537,17 @@ Description:
 		CONFIG_BLK_DEV_THROTTLING_LOW is enabled.
 
 
+What:		/sys/block/<disk>/queue/virt_boundary_mask
+Date:		April 2021
+Contact:	linux-block@...r.kernel.org
+Description:
+		[RO] This file shows the I/O segment alignment mask for the
+		block device.  I/O requests to this device will be split between
+		segments wherever either the end of the previous segment or the
+		beginning of the current segment is not aligned to
+		virt_boundary_mask + 1 bytes.
+
+
 What:		/sys/block/<disk>/queue/wbt_lat_usec
 Date:		November 2016
 Contact:	linux-block@...r.kernel.org
-- 
2.34.1