From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Connect xfs_admin -L to the xfs_io label command so that we can get and
set the label for a live filesystem.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
db/xfs_admin.sh | 42 ++++++++++++++++++++++++++++++++++++++++--
man/man8/xfs_admin.8 | 4 +++-
2 files changed, 43 insertions(+), 3 deletions(-)
diff --git a/db/xfs_admin.sh b/db/xfs_admin.sh
index bd325da2..d18959bf 100755
--- a/db/xfs_admin.sh
+++ b/db/xfs_admin.sh
@@ -7,8 +7,30 @@
status=0
DB_OPTS=""
REPAIR_OPTS=""
+IO_OPTS=""
USAGE="Usage: xfs_admin [-efjlpuV] [-c 0|1] [-L label] [-U uuid] device [logdev]"
+# Try to find a loop device associated with a file. We only want to return
+# one loopdev (multiple loop devices can attach to a single file) so we grab
+# the last line and return it if it's actually a block device.
+try_find_loop_dev_for_file() {
+ local x="$(losetup -O NAME -j "$1" 2> /dev/null | tail -n 1)"
+ test -b "$x" && echo "$x"
+}
+
+# See if we can find a mount point for the argument.
+find_mntpt_for_arg() {
+ local arg="$1"
+
+ # See if we can map the arg to a loop device
+ local loopdev="$(try_find_loop_dev_for_file "${arg}")"
+ test -n "$loopdev" && arg="$loopdev"
+
+ # If we find a mountpoint for the device, do a live query;
+ # otherwise try reading the fs with xfs_db.
+ findmnt -t xfs -f -n -o TARGET "${arg}" 2> /dev/null
+}
+
while getopts "efjlpuc:L:U:V" c
do
case $c in
@@ -16,8 +38,16 @@ do
e) DB_OPTS=$DB_OPTS" -c 'version extflg'";;
f) DB_OPTS=$DB_OPTS" -f";;
j) DB_OPTS=$DB_OPTS" -c 'version log2'";;
- l) DB_OPTS=$DB_OPTS" -r -c label";;
- L) DB_OPTS=$DB_OPTS" -c 'label "$OPTARG"'";;
+ l) DB_OPTS=$DB_OPTS" -r -c label"
+ IO_OPTS=$IO_OPTS" -r -c label"
+ ;;
+ L) DB_OPTS=$DB_OPTS" -c 'label "$OPTARG"'"
+ if [ "$OPTARG" = "--" ]; then
+ IO_OPTS=$IO_OPTS" -c 'label -c'"
+ else
+ IO_OPTS=$IO_OPTS" -c 'label -s "$OPTARG"'"
+ fi
+ ;;
p) DB_OPTS=$DB_OPTS" -c 'version projid32bit'";;
u) DB_OPTS=$DB_OPTS" -r -c uuid";;
U) DB_OPTS=$DB_OPTS" -c 'uuid "$OPTARG"'";;
@@ -41,6 +71,14 @@ case $# in
REPAIR_OPTS=$REPAIR_OPTS" -l '$2'"
fi
+ # Try making the changes online, if supported
+ if [ -n "$IO_OPTS" ] && mntpt="$(find_mntpt_for_arg "$1")"
+ then
+ eval xfs_io -x -p xfs_admin $IO_OPTS "$mntpt"
+ test "$?" -eq 0 && exit 0
+ fi
+
+ # Otherwise try offline changing
if [ -n "$DB_OPTS" ]
then
eval xfs_db -x -p xfs_admin $DB_OPTS $1
diff --git a/man/man8/xfs_admin.8 b/man/man8/xfs_admin.8
index 8afc873f..220dd803 100644
--- a/man/man8/xfs_admin.8
+++ b/man/man8/xfs_admin.8
@@ -26,7 +26,7 @@ uses the
.BR xfs_db (8)
command to modify various parameters of a filesystem.
.PP
-Devices that are mounted cannot be modified.
+Devices that are mounted cannot be modified, except as noted below.
Administrators must unmount filesystems before
.BR xfs_admin " or " xfs_db (8)
can convert parameters.
@@ -67,6 +67,7 @@ log buffers).
.TP
.B \-l
Print the current filesystem label.
+This command can be run if the filesystem is mounted.
.TP
.B \-p
Enable 32bit project identifier support (PROJID32BIT feature).
@@ -102,6 +103,7 @@ The filesystem label can be cleared using the special "\c
.B \-\-\c
" value for
.IR label .
+This command can be run if the filesystem is mounted.
.TP
.BI \-U " uuid"
Set the UUID of the filesystem to
