[PATCH 3/5] xfs_admin: support adding features to V5 filesystems

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Teach the xfs_admin script how to add features to V5 filesystems.
Technically speaking we could add lazycount to the list, but that option
is only useful for the V4 format which is deprecated.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 db/xfs_admin.sh      |    6 ++++--
 man/man8/xfs_admin.8 |   22 ++++++++++++++++++++++
 2 files changed, 26 insertions(+), 2 deletions(-)


diff --git a/db/xfs_admin.sh b/db/xfs_admin.sh
index 430872ef..7a467dbe 100755
--- a/db/xfs_admin.sh
+++ b/db/xfs_admin.sh
@@ -8,9 +8,10 @@ status=0
 DB_OPTS=""
 REPAIR_OPTS=""
 REPAIR_DEV_OPTS=""
-USAGE="Usage: xfs_admin [-efjlpuV] [-c 0|1] [-L label] [-r rtdev] [-U uuid] device [logdev]"
+DB_LOG_OPTS=""
+USAGE="Usage: xfs_admin [-efjlpuV] [-c 0|1] [-L label] [-O v5_feature] [-r rtdev] [-U uuid] device [logdev]"
 
-while getopts "c:efjlL:pr:uU:V" c
+while getopts "c:efjlL:O:pr:uU:V" c
 do
 	case $c in
 	c)	REPAIR_OPTS=$REPAIR_OPTS" -c lazycount="$OPTARG;;
@@ -19,6 +20,7 @@ do
 	j)	DB_OPTS=$DB_OPTS" -c 'version log2'";;
 	l)	DB_OPTS=$DB_OPTS" -r -c label";;
 	L)	DB_OPTS=$DB_OPTS" -c 'label "$OPTARG"'";;
+	O)	REPAIR_OPTS=$REPAIR_OPTS" -c $OPTARG=1";;
 	p)	DB_OPTS=$DB_OPTS" -c 'version projid32bit'";;
 	r)	REPAIR_DEV_OPTS=" -r '$OPTARG'";;
 	u)	DB_OPTS=$DB_OPTS" -r -c uuid";;
diff --git a/man/man8/xfs_admin.8 b/man/man8/xfs_admin.8
index 5ef99316..ae661648 100644
--- a/man/man8/xfs_admin.8
+++ b/man/man8/xfs_admin.8
@@ -6,6 +6,8 @@ xfs_admin \- change parameters of an XFS filesystem
 [
 .B \-eflpu
 ] [
+.BI \-O " featurelist"
+] [
 .BR "\-c 0" | 1
 ] [
 .B \-L
@@ -116,6 +118,26 @@ The filesystem label can be cleared using the special "\c
 " value for
 .IR label .
 .TP
+.BI \-O " feature1" = "status" , "feature2" = "status..."
+Add or remove features on an existing V5 filesystem.
+The features should be specified as a comma-separated list.
+.I status
+should be either 0 to disable the feature or 1 to enable the feature.
+Note, however, that most features cannot be disabled.
+.IP
+.B NOTE:
+Administrators must ensure the filesystem is clean by running
+.B xfs_repair -n
+to inspect the filesystem before performing the upgrade.
+If corruption is found, recovery procedures (e.g. reformat followed by
+restoration from backup; or running
+.B xfs_repair
+without the
+.BR -n )
+must be followed to clean the filesystem.
+.IP
+There are no feature options currently.
+.TP
 .BI \-U " uuid"
 Set the UUID of the filesystem to
 .IR uuid .