Here's my stab at documenting the defaults/config file behavior. I've condensed it down to just mkfs.xfs 8 changes, and tried to make it more concise. I'll let people bikeshed this while I work out a proper way to substitute %sysconfdir% in the text. Note that what I describe in terms of bare filename behavior doesn't match the code today - I think we still need to reach a consensus on whether a bare filename looks in $PWD first, or only in the /etc/ path. (I'd prefer the latter, I think, but still slightly wobbly on this) Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx> --- diff --git a/man/man8/mkfs.xfs.8 b/man/man8/mkfs.xfs.8 index 4b8c78c..64853cc 100644 --- a/man/man8/mkfs.xfs.8 +++ b/man/man8/mkfs.xfs.8 @@ -4,6 +4,10 @@ mkfs.xfs \- construct an XFS filesystem .SH SYNOPSIS .B mkfs.xfs [ +.B \-c +.I configuration +] [ +[ .B \-b .I block_size_options ] [ @@ -121,8 +125,38 @@ when parameters are quantified in those units. .PP Many feature options allow an optional argument of 0 or 1, to explicitly disable or enable the functionality. +.SH DEFAULT VALUES +.BR mkfs.xfs (8) +contains built-in default values for every option as described in the sections +below. +These built-in defaults may evolve over time as new capabilities are added. +If the file +.B /etc/xfs/mkfs/defaults +exists, it will be parsed to override built-in defaults as specified in the +.B defaults +file, and the defaults described in sections below may no longer apply. +.PP +The +.B \-c +option may also be used to specify an alternate configuration file +as descibed in the OPTIONS section. .SH OPTIONS .TP +.BI \-c " configuration" +This option may be used to specify a configuration file other than +.B /etc/xfs/mkfs/defaults +to override selected built-in parameter defaults. +If +.B configuration +is a bare filename, it will be searched in the +.B /etc/xfs/mkfs/ +directory. If +.B configuration +is a full pathname or a relative pathname starting with +.BR \'./\' " or " \'../\' +then that explicit path to the configuration file will be used. +See also the CONFIGURATION FILE FORMAT section below. +.TP .BI \-b " block_size_options" This option specifies the fundamental block size of the filesystem. The valid @@ -920,6 +954,55 @@ Do not attempt to discard blocks at mkfs time. .TP .B \-V Prints the version number and exits. +.SH CONFIGURATION FILE FORMAT +The optional default configuration file in +.B /etc/xfs/mkfs/default +as well as any alternate configuration file specified via the +.B \-c +option follow a simple ini-style format as shown below. +Available options consist of a small subset of the parameters available +via the +.BR mkfs.xfs (8) +command line. +Currently all default parameters can only be either enabled or disabled, +with a value of 1 to enable or 0 to disable. +See below for a list of all supported configuration parameters and their +current built-in default settings. +.PP +.BI [data] +.br +.BI noalign=0 +.PP +.BI [inode] +.br +.BI align=1 +.br +.BI projid32bit=1 +.br +.BI sparse=0 +.PP +.BI [log] +.br +.BI lazy-count=1 +.PP +.BI [metadata] +.br +.BI crc=1 +.br +.BI finobt=1 +.br +.BI rmapbt=0 +.br +.BI reflink=0 +.PP +.BI [naming] +.br +.BI ftype=1 +.PP +.BI [rtdev] +.br +.BI noalign=0 +.PP .SH SEE ALSO .BR xfs (5), .BR mkfs (8), -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
