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From 7ab32ae64d05f018c171ba1525bc337805d84391 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Fri, 11 Oct 2013 11:16:23 +0200
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Subject: [PATCH] blockdev: add note about --setbsz usability
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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disk-utils/blockdev.8 | 4 +++-
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disk-utils/blockdev.c | 2 +-
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2 files changed, 4 insertions(+), 2 deletions(-)
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diff --git a/disk-utils/blockdev.8 b/disk-utils/blockdev.8
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index 2b3d64c..f4282da 100644
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--- a/disk-utils/blockdev.8
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+++ b/disk-utils/blockdev.8
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@@ -68,7 +68,9 @@ Get size in 512-byte sectors.
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.IP "\fB\-\-rereadpt\fP"
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Reread partition table
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.IP "\fB\-\-setbsz\fP \fIbytes\fP"
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-Set blocksize.
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+Set blocksize. Note that the block size is specific to the current file
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+descriptor opening the block device, so the change of block size only persists
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+for as long as blockdev has the device open, and is lost once blockdev exits.
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.IP "\fB\-\-setfra\fP \fIsectors\fP"
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Set filesystem readahead (same like --setra on 2.6 kernels).
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.IP "\fB\-\-setra\fP \fIsectors\fP"
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diff --git a/disk-utils/blockdev.c b/disk-utils/blockdev.c
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index 4543818..d030217 100644
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--- a/disk-utils/blockdev.c
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+++ b/disk-utils/blockdev.c
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@@ -127,7 +127,7 @@ static const struct bdc bdcms[] =
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.argname = "<bytes>",
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.argtype = ARG_INT,
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.flags = FL_NORESULT,
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- .help = N_("set blocksize")
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+ .help = N_("set blocksize on file descriptor opening the block device")
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},{
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IOCTL_ENTRY(BLKGETSIZE),
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.name = "--getsize",
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--
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1.8.3.1
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