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Date: Wed, 16 Dec 2020 11:22:06 +0100 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. Reviewed-by: Andreas Dilger <adilger@...ger.ca> Signed-off-by: Jan Kara <jack@...e.cz> --- misc/mke2fs.8.in | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/misc/mke2fs.8.in b/misc/mke2fs.8.in index e6bfc6d6fd2d..171315b142bc 100644 --- a/misc/mke2fs.8.in +++ b/misc/mke2fs.8.in @@ -207,12 +207,14 @@ 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 +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, upto 64k on ppc64 or aarch64 depending on kernel configuration). +If omitted, block-size is heuristically determined by the filesystem size and the expected usage of the filesystem (see the .B \-T -option). If +option). In most common cases, the default block size is 4k. If .I block-size is preceded by a negative sign ('-'), then .B mke2fs -- 2.16.4
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