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Document the grpid mount option, add it to doc-update patch too.
Merge of 2.6.x-xfs-melb:linux:23160a by kenmcd.

Index: 2.6.x-xfs/Documentation/filesystems/xfs.txt
===================================================================
--- 2.6.x-xfs.orig/Documentation/filesystems/xfs.txt	2005-06-20 17:04:10.610874459 +1000
+++ 2.6.x-xfs/Documentation/filesystems/xfs.txt	2005-07-13 14:15:27.981755471 +1000
@@ -19,32 +19,49 @@
 
 When mounting an XFS filesystem, the following options are accepted.
 
-  biosize=size
-	Sets the preferred buffered I/O size (default size is 64K).
-	"size" must be expressed as the logarithm (base2) of the
-	desired I/O size.
-	Valid values for this option are 14 through 16, inclusive
-	(i.e. 16K, 32K, and 64K bytes).  On machines with a 4K
-	pagesize, 13 (8K bytes) is also a valid size.
-	The preferred buffered I/O size can also be altered on an
-	individual file basis using the ioctl(2) system call.
+  allocsize=size
+	Sets the buffered I/O end-of-file preallocation size when
+	doing delayed allocation writeout (default size is 64KB).
+	Valid values for this option are page size (typically 4KB)
+	through to 1GB, inclusive, in power-of-2 increments.
 
   dmapi
 	Enable the DMAPI (Data Management API) event callouts.
 	Use with the "mtpt" option.
 
+  grpid/bsdgroups and nogrpid/sysvgroups
+	These options define what group ID a newly created file gets.
+	When grpid is set, it takes the group ID of the directory in
+	which it is created; otherwise (the default) 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 a directory itself.
+
+  ihashsize=value
+	Sets the number of hash buckets available for hashing the
+	in-memory inodes of the specified mount point.  If a value
+	of zero is used, the value selected by the default algorithm
+	will be displayed in /proc/mounts.
+
   ikeep/noikeep
 	When inode clusters are emptied of inodes, keep them around
 	on the disk (ikeep) - this is the traditional XFS behaviour
 	and is still the default for now.  Using the noikeep option,
 	inode clusters are returned to the free space pool.
 
+  inode64
+	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.  This is
+	provided for backwards compatibility, but causes problems for
+	backup applications that cannot handle large inode numbers.
+
   logbufs=value
 	Set the number of in-memory log buffers.  Valid numbers range
 	from 2-8 inclusive.
 	The default value is 8 buffers for filesystems with a
-	blocksize of 64K, 4 buffers for filesystems with a blocksize
-	of 32K, 3 buffers for filesystems with a blocksize of 16K
+	blocksize of 64KB, 4 buffers for filesystems with a blocksize
+	of 32KB, 3 buffers for filesystems with a blocksize of 16KB
 	and 2 buffers for all other configurations.  Increasing the
 	number of buffers may increase performance on some workloads
 	at the cost of the memory used for the additional log buffers
@@ -100,13 +117,17 @@
 	O_SYNC writes can be lost if the system crashes.
 	If timestamp updates are critical, use the osyncisosync option.
 
-  quota/usrquota/uqnoenforce
+  uquota/usrquota/uqnoenforce/quota
 	User disk quota accounting enabled, and limits (optionally)
-	enforced.
+	enforced.  Refer to xfs_quota(8) for further details.
 
-  grpquota/gqnoenforce
+  gquota/grpquota/gqnoenforce
 	Group disk quota accounting enabled and limits (optionally)
-	enforced.
+	enforced.  Refer to xfs_quota(8) for further details.
+
+  pquota/prjquota/pqnoenforce
+	Project disk quota accounting enabled and limits (optionally)
+	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
@@ -122,6 +143,12 @@
 	The "swidth" option is required if the "sunit" option has been
 	specified, and must be a multiple of the "sunit" value.
 
+  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.
+
+
 sysctls
 =======
 
@@ -181,17 +208,29 @@
   	Controls whether unprivileged users can use chown to "give away"
 	a file to another user.
 
-  fs.xfs.inherit_sync		(Min: 0  Default: 1  Max 1)
+  fs.xfs.inherit_sync		(Min: 0  Default: 1  Max: 1)
 	Setting this to "1" will cause the "sync" flag set 
-	by the chattr(1) 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)
+  fs.xfs.inherit_nodump		(Min: 0  Default: 1  Max: 1)
 	Setting this to "1" will cause the "nodump" flag set 
-	by the chattr(1) 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)
+  fs.xfs.inherit_noatime	(Min: 0  Default: 1  Max: 1)
 	Setting this to "1" will cause the "noatime" flag set 
-	by the chattr(1) 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
 	inherited by files in that directory.
+
+  fs.xfs.rotorstep		(Min: 1  Default: 1  Max: 256)
+	In "inode32" allocation mode, this option determines how many
+	files the allocator attempts to allocate in the same allocation
+	group before moving to the next allocation group.  The intent
+	is to control the rate at which the allocator moves between
+	allocation groups when allocating extents for new files.