From 4c8988667193cbd405eae05518425905db517626 Mon Sep 17 00:00:00 2001
From: Jan Chaloupka <jchaloup@redhat.com>
Date: Wed, 30 Jul 2014 17:35:04 +0200
Subject: [PATCH] open.2

---
 man-pages/man2/open.2 | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/man-pages/man2/open.2 b/man-pages/man2/open.2
index 84331c6..6b25e7b 100644
--- a/man-pages/man2/open.2
+++ b/man-pages/man2/open.2
@@ -875,10 +875,16 @@ for doing so, for example the
 operation in
 .BR xfsctl (3).
 .LP
-Under Linux 2.4, transfer sizes, and the alignment of the user buffer
-and the file offset must all be multiples of the logical block size
-of the file system.
-Under Linux 2.6, alignment to 512-byte boundaries suffices.
+Under  Linux  2.4, transfer sizes, and the alignment of the user buffer
+and the file offset must all be multiples of the logical block size  of
+the filesystem.  Since Linux 2.6.0, alignment to the logical block size
+of the underlying storage (typically 512 bytes) suffices.  The  logical
+block  size can be determined using the ioctl(2) BLKSSZGET operation or
+from the shell using the command:
+
+.RS
+.BR    blockdev " " --getss
+.RE
 .LP
 .B O_DIRECT
 I/Os should never be run concurrently with the
@@ -1010,7 +1016,8 @@ to enable this flag.
 .BR fopen (3),
 .BR fifo (7),
 .BR path_resolution (7),
-.BR symlink (7)
+.BR symlink (7),
+.BR blockdev (8)
 .SH COLOPHON
 This page is part of release 3.53 of the Linux
 .I man-pages
-- 
1.9.3