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

Convert man page for btrfs-replace.

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

Documentation/Makefile

@@ -28,7 +28,7 @@ MAN8_TXT += btrfs-send.txt
 MAN8_TXT += btrfs-receive.txt
 MAN8_TXT += btrfs-quota.txt
 MAN8_TXT += btrfs-qgroup.txt
-#MAN8_TXT += btrfs-replace.txt
+MAN8_TXT += btrfs-replace.txt
 #MAN8_TXT += btrfs-dedup.txt
 
 MAN_TXT = $(MAN8_TXT)

Documentation/btrfs-replace.txt

@@ -0,0 +1,76 @@
+btrfs-replace(8)
+===============
+
+NAME
+----
+btrfs-replace - replace devices managed by btrfs with other device.
+
+SYNOPSIS
+--------
+'btrfs replace' <subcommand> <args>
+
+DESCRIPTION
+-----------
+'btrfs replace' is used to replace btrfs managed devices with other device.
+
+SUBCOMMAND
+----------
+'start' [-Bfr] <srcdev>|<devid> <targetdev> <path>::
+Replace device of a btrfs filesystem.
++
+On a live filesystem, duplicate the data to the target device which
+is currently stored on the source device.
+If the source device is not available anymore, or if the -r option is set,
+the data is built only using the RAID redundancy mechanisms.
+After completion of the operation, the source device is removed from the
+filesystem.
+If the <srcdev> is a numerical value, it is assumed to be the device id
+of the filesystem which is mounted at <path>, otherwise is is
+the path to the source device. If the source device is disconnected,
+from the system, you have to use the devid parameter format.
+The <targetdev> needs to be same size or larger than the <srcdev>.
++
+`Options`
++
+-r::::
+only read from <srcdev> if no other zero-defect mirror exists.
+(enable this if your drive has lots of read errors, the access would be very
+slow)
+-f::::
+force using and overwriting <targetdev> even if it looks like
+containing a valid btrfs filesystem.
++
+A valid filesystem is assumed if a btrfs superblock is found which contains a
+correct checksum. Devices which are currently mounted are
+never allowed to be used as the <targetdev>.
+-B::::
+no background replace.
+
+'status' [-1] <mount_point>::
+Print status and progress information of a running device replace operation.
++
+`Options`
++
+-1::::
+print once instead of print continuously until the replace
+operation finishes (or is canceled)
+
+'cancel' <mount_point>::
+Cancel a running device replace operation.
+
+EXIT STATUS
+-----------
+'btrfs replace' 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),