From: Dave Chinner <dchinner@xxxxxxxxxx> So people know it exists. Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx> --- man/man8/mkfs.xfs.8 | 113 +++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 106 insertions(+), 7 deletions(-) diff --git a/man/man8/mkfs.xfs.8 b/man/man8/mkfs.xfs.8 index 0a7858748457..b959f293edb5 100644 --- a/man/man8/mkfs.xfs.8 +++ b/man/man8/mkfs.xfs.8 @@ -122,8 +122,46 @@ If the size of the block or sector is not specified, the default sizes Many feature options allow an optional argument of 0 or 1, to explicitly disable or enable the functionality. .SH OPTIONS +Options may be specified either on the command line or in a configuration file. +Not all command line options can be specified in configuration files; only the +command line options followed by a +.B [section] +label can be used in a configuration file. +.PP +Options that can be used in configuration files are grouped into related +sections containing multiple options. +The command line options and configuration files use the same option +sections and grouping. +Configuration file section names are listed in the command line option +sections below. +Option names and values are the same for both command line +and configuration file specification. +.PP +Options specified are the combined set of command line parameters and +configuration file parameters. +Duplicated options will result in a respecification error, regardless of the +location they were specified at. +.TP +.BI \-c " configuration_file_option" +This option specifies the files that mkfs configuration will be obtained from. +The valid +.I configuration_file_option +is: +.RS 1.2i .TP +.BI options= name +The configuration options will be sourced from the file specified by the +.I name +option string. +This option can be use either an absolute or relative path to the configuration +file to be read. +.RE +.PP +.PD 0 .BI \-b " block_size_options" +.TP +.BI "Section Name: " [block] +.PD This option specifies the fundamental block size of the filesystem. The valid .I block_size_option @@ -141,8 +179,12 @@ Although will accept any of these values and create a valid filesystem, XFS on Linux can only mount filesystems with pagesize or smaller blocks. .RE -.TP +.PP +.PD 0 .BI \-m " global_metadata_options" +.TP +.BI "Section Name: " [metadata] +.PD These options specify metadata format options that either apply to the entire filesystem or aren't easily characterised by a specific functionality group. The valid @@ -243,8 +285,12 @@ reflink-enabled XFS filesystems. To use filesystem DAX with XFS, specify the .B \-m reflink=0 option to mkfs.xfs to disable the reflink feature. .RE -.TP +.PP +.PD 0 .BI \-d " data_section_options" +.TP +.BI "Section Name: " [data] +.PD These options specify the location, size, and other parameters of the data section of the filesystem. The valid .I data_section_options @@ -416,8 +462,12 @@ By default, .B mkfs.xfs will not write to the device if it suspects that there is a filesystem or partition table on the device already. -.TP +.PP +.PD 0 .BI \-i " inode_options" +.TP +.BI "Section Name: " [inode] +.PD This option specifies the inode size of the filesystem, and other inode allocation parameters. The XFS inode contains a fixed-size part and a variable-size part. @@ -537,8 +587,12 @@ accommodate a chunk of 64 inodes. Without this feature enabled, inode allocations can fail with out of space errors under severe fragmented free space conditions. .RE -.TP +.PP +.PD 0 .BI \-l " log_section_options" +.TP +.BI "Section Name: " [log] +.PD These options specify the location, size, and other parameters of the log section of the filesystem. The valid .I log_section_options @@ -651,8 +705,12 @@ is 1 (on) so you must specify if you want to disable this feature for older kernels which don't support it. .RE -.TP +.PP +.PD 0 .BI \-n " naming_options" +.TP +.BI "Section Name: " [naming] +.PD These options specify the version and size parameters for the naming (directory) area of the filesystem. The valid .I naming_options @@ -858,8 +916,12 @@ to be constructed; the .B \-q flag suppresses this. -.TP +.PP +.PD 0 .BI \-r " realtime_section_options" +.TP +.BI "Section Name: " [realtime] +.PD These options specify the location, size, and other parameters of the real-time section of the filesystem. The valid .I realtime_section_options @@ -893,8 +955,12 @@ or logical volume containing the section. This option disables stripe size detection, enforcing a realtime device with no stripe geometry. .RE -.TP +.PP +.PD 0 .BI \-s " sector_size_options" +.TP +.BI "Section Name: " [sector] +.PD This option specifies the fundamental sector size of the filesystem. The valid .I sector_size_option @@ -933,6 +999,39 @@ Do not attempt to discard blocks at mkfs time. .TP .B \-V Prints the version number and exits. +.SH Configuration File Format +The configuration file uses a basic INI format to specify sections and options +within a section. +Section and option names are case sensitive. +Section names must not contain whitespace. +Options are name-value pairs, ended by the first whitespace in the line. +Option names cannot contain whitespace. +Full line comments can be added by starting a line with a # symbol. +If values contain whitespace, then it must be quoted. +.PP +The following example configuration file sets the block size to 4096 bytes, +turns on reverse mapping btrees and sets the inode size to 2048 bytes. +.PP +.PD 0 +# Example mkfs.xfs configuration file +.HP +.HP +[block] +.HP +size=4k +.HP +.HP +[metadata] +.HP +rmapbt=1 +.HP +.HP +[inode] +.HP +size=2048 +.HP +.PD +.PP .SH SEE ALSO .BR xfs (5), .BR mkfs (8), -- 2.28.0
