From: Jan Kara Date: Thu, 21 Jan 2021 23:26:25 +0000 (-0500) Subject: mke2fs.8: Improve valid block size documentation X-Git-Tag: v1.45.7~20 X-Git-Url: https://git.whamcloud.com/?a=commitdiff_plain;h=33b0356c353feaef32fdcf300d39d2d2ef08ef1f;p=tools%2Fe2fsprogs.git mke2fs.8: Improve valid block size documentation Explain which valid block sizes mke2fs supports in more detail. Reviewed-by: Andreas Dilger Signed-off-by: Jan Kara Signed-off-by: Theodore Ts'o --- diff --git a/misc/mke2fs.8.in b/misc/mke2fs.8.in index e6bfc6d..171315b 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