Merger of the quota64 project into head.

This joint work of Dag-Erling Smørgrav and myself updates the
FFS quota system to support both traditional 32-bit and new 64-bit
quotas (for those of you who want to put 2+Tb quotas on your users).

By default quotas are not compiled into the kernel. To include them
in your kernel configuration you need to specify:

options         QUOTA                   # Enable FFS quotas

If you are already running with the current 32-bit quotas, they
should continue to work just as they have in the past. If you
wish to convert to using 64-bit quotas, use `quotacheck -c 64';
if you wish to revert from 64-bit quotas back to 32-bit quotas,
use `quotacheck -c 32'.

There is a new library of functions to simplify the use of the
quota system, do `man quotafile' for details. If your application
is currently using the quotactl(2), it is highly recommended that
you convert your application to use the quotafile interface.
Note that existing binaries will continue to work.

Special thanks to John Kozubik of rsync.net for getting me
interested in pursuing 64-bit quota support and for funding
part of my development time on this project.

1 files changed, 18 insertions, 4 deletions

diff --git a/lib/libc/sys/quotactl.2 b/lib/libc/sys/quotactl.2
index 4b4dca5..ff3cb4b 100644
--- a/lib/libc/sys/quotactl.2
+++ b/lib/libc/sys/quotactl.2
@@ -84,7 +84,7 @@ and group identifiers (GRPQUOTA).
 The
 .Dq ufs
 specific commands are:
-.Bl -tag -width Q_QUOTAOFFxx
+.Bl -tag -width Q_GETQUOTASIZEx
 .It Dv Q_QUOTAON
 Enable disk quotas for the file system specified by
 .Fa path .
@@ -110,6 +110,17 @@ and
 .Fa id
 arguments are unused.
 Only the super-user may turn quotas off.
+.It Dv Q_GETQUOTASIZE
+Get the wordsize used to represent the quotas for the user or group
+(as determined by the command type).
+Possible values are 32 for the old-style quota file 
+and 64 for the new-style quota file.
+The
+.Fa addr
+argument is a pointer to an integer into which the size is stored.
+The identifier
+.Fa id
+is not used.
 .It Dv Q_GETQUOTA
 Get disk quota limits and current usage for the user or group
 (as determined by the command type) with identifier
@@ -177,9 +188,11 @@ The
 argument
 or the command type is invalid.
 In
-.Dv Q_GETQUOTA
-and
+.Dv Q_GETQUOTASIZE ,
+.Dv Q_GETQUOTA ,
 .Dv Q_SETQUOTA ,
+and
+.Dv Q_SETUSE ,
 quotas are not currently enabled for this file system.
 .Pp
 The
@@ -208,7 +221,8 @@ Too many symbolic links were encountered in translating a pathname.
 .It Bq Er EROFS
 In
 .Dv Q_QUOTAON ,
-the quota file resides on a read-only file system.
+either the file system on which quotas are to be enabled is mounted read-only
+or the quota file resides on a read-only file system.
 .It Bq Er EIO
 An
 .Tn I/O