btrfs-progs: Convert man page for btrfs-quota.

Convert man page for btrfs-quota.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

Documentation/Makefile

@@ -26,7 +26,7 @@ MAN8_TXT += btrfs-rescue.txt
 MAN8_TXT += btrfs-inspect-internal.txt
 MAN8_TXT += btrfs-send.txt
 MAN8_TXT += btrfs-receive.txt
-#MAN8_TXT += btrfs-quota.txt
+MAN8_TXT += btrfs-quota.txt
 #MAN8_TXT += btrfs-replace.txt
 #MAN8_TXT += btrfs-dedup.txt
 

Documentation/btrfs-quota.txt

@@ -0,0 +1,59 @@
+btrfs-quota(8)
+==============
+
+NAME
+----
+btrfs-quota - control the quota of a btrfs filesystem
+
+SYNOPSIS
+--------
+'btrfs quota' <subcommand> <args>
+
+DESCRIPTION
+-----------
+'btrfs quota' is used to enable/disable or rescan subvolume quota of a btrfs
+filesystem.
+
+For setting quota or other quota operations on a btrfs filesystem, please see
+`btrfs-qgroup`(8) for details.
+
+WARNING: Quota and qgroup in btrfs filesystem is not stable and impacts
+performance in mainline kernel yet(v3.14 so far).
+
+SUBCOMMAND
+----------
+'enable' <path>::
+Enable subvolume quota support for a filesystem.
+
+
+'disable' <path>::
+Disable subvolume quota support for a filesystem.
+
+'rescan' [-s] <path>::
+Trash all qgroup numbers and scan the metadata again with the current config.
++
+`Options`
++
+-s::::
+show status of a running rescan operation.
+-w::::
+wait for rescan operation to finish(can be already in progress).
+
+EXIT STATUS
+-----------
+'btrfs quota' returns a zero exist status if it succeeds. Non zero is
+returned in case of failure.
+
+AVAILABILITY
+------------
+'btrfs' is part of btrfs-progs. Btrfs filesystem is currently under heavy
+development,
+and not suitable for any uses other than benchmarking and review.
+Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
+further details.
+
+SEE ALSO
+--------
+`mkfs.btrfs`(8),
+`btrfs-subvolume`(8),
+`btrfs-qgroup`(8)