linux-ext4 - [PATCH 3/3] mke2fs: document bigalloc and cluster-size

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Message-Id: <1358068095-9034-3-git-send-email-wenqing.lz@taobao.com>
Date:	Sun, 13 Jan 2013 17:08:15 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	Zheng Liu <wenqing.lz@...bao.com>
Subject: [PATCH 3/3] mke2fs: document bigalloc and cluster-size

From: Zheng Liu <wenqing.lz@...bao.com>

Bigalloc feature has been used for a long time, but the documentation in mke2fs
is still missing.  So add it.

Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
---
 misc/mke2fs.8.in | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/misc/mke2fs.8.in b/misc/mke2fs.8.in
index d4fbe00..ca3083d 100644
--- a/misc/mke2fs.8.in
+++ b/misc/mke2fs.8.in
@@ -187,6 +187,11 @@ Check the device for bad blocks before creating the file system.  If
 this option is specified twice, then a slower read-write
 test is used instead of a fast read-only test.
 .TP
+.B \-C " cluster-size"
+Specify the size of cluster in bytes.  Valid cluster-size values are from
+2048 to 256M bytes per cluster.  If omiited, cluster-size is 64KB by
+default.
+.TP
 .B \-D
 Use direct I/O when writing to the disk.  This avoids mke2fs dirtying a
 lot of buffer cache memory, which may impact other applications running
@@ -516,6 +521,12 @@ prefix the feature name with a  caret ('^') character.  The
 pseudo-filesystem feature "none" will clear all filesystem features.
 .RS 1.2i
 .TP
+.B bigalloc
+Allow to allocate block-size beyond the 4096 bytes.  That can decrease the time
+spent on doing block allocation and brings smaller fragmentation, especially
+for large files.  The size can be specified using the
+.B \-C option.
+.TP
 .B dir_index
 Use hashed b-trees to speed up lookups in large directories.
 .TP
-- 
1.7.12.rc2.18.g61b472e

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