[PATCH v1] Doc : fs : convert xfs.txt to ReST

[Sheriff Esseson]

	Convert xfs.txt to ReST, markup and rename accordingly. Update
	Documentation/index.rst.
	
	While at it, make "value" in "option=value" form xfs options definable by
	the user, by embedding in angle "<>" brackets, rather than something
	predifined elsewhere. This is inline with the conventions in manuals.
	
	Also, make defaults of boolean options prefixed with "(*)". This is
	so that options can be compressed to "[no]option" and on a single line, which renders
	consistently and nicely in htmldocs.
	lastly, enforce a "one option, one definition" policy to keep things
	consistent and simple.

Signed-off-by: Sheriff Esseson <sheriffesseson@xxxxxxxxx>
---
 Documentation/filesystems/index.rst           |   1 +
 .../filesystems/{xfs.txt => xfs.rst}          | 190 ++++++++++--------
 2 files changed, 103 insertions(+), 88 deletions(-)
 rename Documentation/filesystems/{xfs.txt => xfs.rst} (74%)

diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst
index 1131c34d7..be91fe616 100644
--- a/Documentation/filesystems/index.rst
+++ b/Documentation/filesystems/index.rst
@@ -41,3 +41,4 @@ Documentation for individual filesystem types can be found here.
    :maxdepth: 2
 
    binderfs.rst
+   xfs.rst
diff --git a/Documentation/filesystems/xfs.txt b/Documentation/filesystems/xfs.rst
similarity index 74%
rename from Documentation/filesystems/xfs.txt
rename to Documentation/filesystems/xfs.rst
index a5cbb5e0e..5e29e1583 100644
--- a/Documentation/filesystems/xfs.txt
+++ b/Documentation/filesystems/xfs.rst
@@ -1,4 +1,4 @@
-
+======================
 The SGI XFS Filesystem
 ======================
 
@@ -18,10 +18,10 @@ Mount Options
 =============
 
 When mounting an XFS filesystem, the following options are accepted.
-For boolean mount options, the names with the (*) suffix is the
+For boolean mount options, the names with the "(*)" prefix is the
 default behaviour.
 
-  allocsize=size
+   allocsize=<size>
 	Sets the buffered I/O end-of-file preallocation size when
 	doing delayed allocation writeout (default size is 64KiB).
 	Valid values for this option are page size (typically 4KiB)
@@ -34,181 +34,195 @@ default behaviour.
 	to the file. Specifying a fixed allocsize value turns off
 	the dynamic behaviour.
 
-  attr2
-  noattr2
+   [no]attr2
 	The options enable/disable an "opportunistic" improvement to
 	be made in the way inline extended attributes are stored
 	on-disk.  When the new form is used for the first time when
-	attr2 is selected (either when setting or removing extended
+	``attr2`` is selected (either when setting or removing extended
 	attributes) the on-disk superblock feature bit field will be
 	updated to reflect this format being in use.
 
 	The default behaviour is determined by the on-disk feature
-	bit indicating that attr2 behaviour is active. If either
-	mount option it set, then that becomes the new default used
-	by the filesystem.
-
-	CRC enabled filesystems always use the attr2 format, and so
-	will reject the noattr2 mount option if it is set.
+	bit indicating that ``attr2`` behaviour is active. If either
+	mount options is set, then that becomes the new default used
+	by the filesystem. However on CRC enabled filesystems, the
+        ``attr2`` format is always used , and so
+	will reject the ``noattr2`` mount option if it is set.
 
-  discard
-  nodiscard (*)
+   (*)[no]discard
 	Enable/disable the issuing of commands to let the block
 	device reclaim space freed by the filesystem.  This is
 	useful for SSD devices, thinly provisioned LUNs and virtual
 	machine images, but may have a performance impact.
 
-	Note: It is currently recommended that you use the fstrim
-	application to discard unused blocks rather than the discard
+	Note: It is currently recommended that you use the ``fstrim``
+	application to discard unused blocks rather than the ``discard``
 	mount option because the performance impact of this option
 	is quite severe.
 
-  grpid/bsdgroups
-  nogrpid/sysvgroups (*)
+   grpid/bsdgroups
+   nogrpid/(*)sysvgroups
 	These options define what group ID a newly created file
-	gets.  When grpid is set, it takes the group ID of the
+	gets.  When ``grpid`` is set, it takes the group ID of the
 	directory in which it is created; otherwise it takes the
-	fsgid of the current process, unless the directory has the
-	setgid bit set, in which case it takes the gid from the
-	parent directory, and also gets the setgid bit set if it is
+	``fsgid`` of the current process, unless the directory has the
+	``setgid`` bit set, in which case it takes the ``gid`` from the
+	parent directory, and also gets the ``setgid`` bit set if it is
 	a directory itself.
 
-  filestreams
+   filestreams
 	Make the data allocator use the filestreams allocation mode
 	across the entire filesystem rather than just on directories
 	configured to use it.
 
-  ikeep
-  noikeep (*)
-	When ikeep is specified, XFS does not delete empty inode
-	clusters and keeps them around on disk.  When noikeep is
+   (*)[no]ikeep
+	When ``ikeep`` is specified, XFS does not delete empty inode
+	clusters and keeps them around on disk.  When ``noikeep`` is
 	specified, empty inode clusters are returned to the free
 	space pool.
 
-  inode32
-  inode64 (*)
-	When inode32 is specified, it indicates that XFS limits
+   inode32 | (*)inode64
+	When ``inode32`` is specified, it indicates that XFS limits
 	inode creation to locations which will not result in inode
 	numbers with more than 32 bits of significance.
 
-	When inode64 is specified, it indicates that XFS is allowed
+	When ``inode64`` is specified, it indicates that XFS is allowed
 	to create inodes at any location in the filesystem,
 	including those which will result in inode numbers occupying
-	more than 32 bits of significance. 
+	more than 32 bits of significance.
 
-	inode32 is provided for backwards compatibility with older
+	``inode32`` is provided for backwards compatibility with older
 	systems and applications, since 64 bits inode numbers might
 	cause problems for some applications that cannot handle
 	large inode numbers.  If applications are in use which do
-	not handle inode numbers bigger than 32 bits, the inode32
+	not handle inode numbers bigger than 32 bits, the ``inode32``
 	option should be specified.
 
 
-  largeio
-  nolargeio (*)
-	If "nolargeio" is specified, the optimal I/O reported in
-	st_blksize by stat(2) will be as small as possible to allow
+   (*)[no]largeio
+	If ``nolargeio`` is specified, the optimal I/O reported in
+	st_blksize by **stat(2)** will be as small as possible to allow
 	user applications to avoid inefficient read/modify/write
 	I/O.  This is typically the page size of the machine, as
 	this is the granularity of the page cache.
 
-	If "largeio" specified, a filesystem that was created with a
-	"swidth" specified will return the "swidth" value (in bytes)
-	in st_blksize. If the filesystem does not have a "swidth"
-	specified but does specify an "allocsize" then "allocsize"
+	If ``largeio`` specified, a filesystem that was created with a
+	``swidth`` specified will return the ``swidth`` value (in bytes)
+	in st_blksize. If the filesystem does not have a ``swidth``
+	specified but does specify an ``allocsize`` then ``allocsize``
 	(in bytes) will be returned instead. Otherwise the behaviour
-	is the same as if "nolargeio" was specified.
+	is the same as if ``nolargeio`` was specified.
 
-  logbufs=value
-	Set the number of in-memory log buffers.  Valid numbers
+   logbufs=<value>
+	Set the number of in-memory log buffers to ``value``.  Valid numbers
 	range from 2-8 inclusive.
 
 	The default value is 8 buffers.
 
 	If the memory cost of 8 log buffers is too high on small
 	systems, then it may be reduced at some cost to performance
-	on metadata intensive workloads. The logbsize option below
+	on metadata intensive workloads. The ``logbsize`` option below
 	controls the size of each buffer and so is also relevant to
 	this case.
 
-  logbsize=value
-	Set the size of each in-memory log buffer.  The size may be
-	specified in bytes, or in kilobytes with a "k" suffix.
+   logbsize=<value>
+	Set the size of each in-memory log buffer to ``value``.  The size
+        may be specified in bytes, or in kilobytes with a "k" suffix.
 	Valid sizes for version 1 and version 2 logs are 16384 (16k)
 	and 32768 (32k).  Valid sizes for version 2 logs also
 	include 65536 (64k), 131072 (128k) and 262144 (256k). The
-	logbsize must be an integer multiple of the log
-	stripe unit configured at mkfs time.
+	``logbsize`` must be an integer multiple of the
+        "log stripe unit" configured at mkfs time.
 
 	The default value for for version 1 logs is 32768, while the
-	default value for version 2 logs is MAX(32768, log_sunit).
+	default value for version 2 logs is ``MAX(32768, log_sunit)``.
 
-  logdev=device and rtdev=device
-	Use an external log (metadata journal) and/or real-time device.
-	An XFS filesystem has up to three parts: a data section, a log
-	section, and a real-time section.  The real-time section is
-	optional, and the log section can be separate from the data
-	section or contained within it.
+   logdev=<device>
+	Use ``device`` as an external log.
+	In an XFS filesystem, the log section can be separate from
+        the data section or contained within it.
 
-  noalign
+   rtdev=<device>
+        An XFS filesystem has up to three parts: a data section, a log
+	section, and a real-time section.  The real-time section is optional.
+        If enabled, ``rtdev`` sets ``device`` to be used as an
+        external real-time section, similar to ``logdev`` above.
+
+   noalign
 	Data allocations will not be aligned at stripe unit
 	boundaries. This is only relevant to filesystems created
 	with non-zero data alignment parameters (sunit, swidth) by
 	mkfs.
 
-  norecovery
+   norecovery
 	The filesystem will be mounted without running log recovery.
 	If the filesystem was not cleanly unmounted, it is likely to
-	be inconsistent when mounted in "norecovery" mode.
+	be inconsistent when mounted in ``norecovery`` mode.
 	Some files or directories may not be accessible because of this.
-	Filesystems mounted "norecovery" must be mounted read-only or
+	Filesystems mounted ``norecovery`` must be mounted read-only or
 	the mount will fail.
 
-  nouuid
+   nouuid
 	Don't check for double mounted file systems using the file
 	system uuid.  This is useful to mount LVM snapshot volumes,
-	and often used in combination with "norecovery" for mounting
+	and often used in combination with ``norecovery`` for mounting
 	read-only snapshots.
 
-  noquota
+   noquota
 	Forcibly turns off all quota accounting and enforcement
 	within the filesystem.
 
-  uquota/usrquota/uqnoenforce/quota
+   uquota/usrquota/uqnoenforce/quota
 	User disk quota accounting enabled, and limits (optionally)
-	enforced.  Refer to xfs_quota(8) for further details.
+	enforced.  Refer to **xfs_quota(8)** for further details.
 
-  gquota/grpquota/gqnoenforce
+   gquota/grpquota/gqnoenforce
 	Group disk quota accounting enabled and limits (optionally)
-	enforced.  Refer to xfs_quota(8) for further details.
+	enforced.  Refer to **xfs_quota(8)** for further details.
 
-  pquota/prjquota/pqnoenforce
+   pquota/prjquota/pqnoenforce
 	Project disk quota accounting enabled and limits (optionally)
-	enforced.  Refer to xfs_quota(8) for further details.
+	enforced.  Refer to **xfs_quota(8)** for further details.
 
-  sunit=value and swidth=value
-	Used to specify the stripe unit and width for a RAID device
-	or a stripe volume.  "value" must be specified in 512-byte
-	block units. These options are only relevant to filesystems
+   sunit=<value>
+	Used to specify the stripe unit for a RAID device
+	or (in conjunction with ``swidth`` below) a stripe volume.  ``value`` must be specified in 512-byte
+	block units. This option is only relevant to filesystems
 	that were created with non-zero data alignment parameters.
 
-	The sunit and swidth parameters specified must be compatible
+	The ``sunit`` parameter specified must be compatible
 	with the existing filesystem alignment characteristics.  In
-	general, that means the only valid changes to sunit are
-	increasing it by a power-of-2 multiple. Valid swidth values
-	are any integer multiple of a valid sunit value.
+	general, that means the only valid changes to ``sunit`` are
+	increasing it by a power-of-2 multiple.
 
-	Typically the only time these mount options are necessary if
-	after an underlying RAID device has had it's geometry
+	Typically, this mount option is necessary only
+	after an underlying RAID device has had its geometry
 	modified, such as adding a new disk to a RAID5 lun and
 	reshaping it.
 
-  swalloc
+   swidth=<value>
+        Used to specify the stripe width for a RAID device
+	or (in conjunction with ``sunit`` above) a stripe volume.  ``value`` must be specified in 512-byte
+	block units. This option, like ``sunit`` above, is only
+        relevant to filesystems that were created with non-zero data alignment parameters.
+
+	The ``swidth`` parameter specified must be compatible
+	with the existing filesystem alignment characteristics.  In
+	general, that means the only valid swidth values
+	are any integer multiple of a valid ``sunit`` value.
+
+	Typically, this mount option is necessary only
+	after an underlying RAID device has had its geometry
+	modified, such as adding a new disk to a RAID5 lun and
+	reshaping it.
+
+
+   swalloc
 	Data allocations will be rounded up to stripe width boundaries
 	when the current end of file is being extended and the file
 	size is larger than the stripe width size.
 
-  wsync
+   wsync
 	When specified, all filesystem namespace operations are
 	executed synchronously. This ensures that when the namespace
 	operation (create, unlink, etc) completes, the change to the
@@ -302,27 +316,27 @@ The following sysctls are available for the XFS filesystem:
 
   fs.xfs.inherit_sync		(Min: 0  Default: 1  Max: 1)
 	Setting this to "1" will cause the "sync" flag set
-	by the xfs_io(8) chattr command on a directory to be
+	by the **xfs_io(8)** chattr command on a directory to be
 	inherited by files in that directory.
 
   fs.xfs.inherit_nodump		(Min: 0  Default: 1  Max: 1)
 	Setting this to "1" will cause the "nodump" flag set
-	by the xfs_io(8) chattr command on a directory to be
+	by the **xfs_io(8)** chattr command on a directory to be
 	inherited by files in that directory.
 
   fs.xfs.inherit_noatime	(Min: 0  Default: 1  Max: 1)
 	Setting this to "1" will cause the "noatime" flag set
-	by the xfs_io(8) chattr command on a directory to be
+	by the **xfs_io(8)** chattr command on a directory to be
 	inherited by files in that directory.
 
   fs.xfs.inherit_nosymlinks	(Min: 0  Default: 1  Max: 1)
 	Setting this to "1" will cause the "nosymlinks" flag set
-	by the xfs_io(8) chattr command on a directory to be
+	by the **xfs_io(8)** chattr command on a directory to be
 	inherited by files in that directory.
 
   fs.xfs.inherit_nodefrag	(Min: 0  Default: 1  Max: 1)
 	Setting this to "1" will cause the "nodefrag" flag set
-	by the xfs_io(8) chattr command on a directory to be
+	by the **xfs_io(8)** chattr command on a directory to be
 	inherited by files in that directory.
 
   fs.xfs.rotorstep		(Min: 1  Default: 1  Max: 256)
-- 
2.22.0