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Date:   Tue, 13 Oct 2020 15:38:48 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>, Jan Kara <jack@...e.cz>
Subject: [PATCH] mke2fs.8: Improve valid block size documentation

Explain which valid block sizes mke2fs supports in more detail.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 misc/mke2fs.8.in | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/misc/mke2fs.8.in b/misc/mke2fs.8.in
index e6bfc6d6fd2d..0814d216f3a4 100644
--- a/misc/mke2fs.8.in
+++ b/misc/mke2fs.8.in
@@ -207,10 +207,11 @@ manual page for more details.
 .SH OPTIONS
 .TP
 .BI \-b " block-size"
-Specify the size of blocks in bytes.  Valid block-size values are 1024,
-2048 and 4096 bytes per block.  If omitted,
-block-size is heuristically determined by the filesystem size and
-the expected usage of the filesystem (see the
+Specify the size of blocks in bytes.  Valid block-size values are powers of two
+from 1024 up to 65536 (however note that the kernel is able to mount only
+filesystems with block-size smaller or equal to the system page size - 4k on
+x86 systems). If omitted, block-size is heuristically determined by the
+filesystem size and the expected usage of the filesystem (see the
 .B \-T
 option).  If
 .I block-size
-- 
2.16.4

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