common/xfs: wipe the XFS superblock of each AGs

xfs/030 always fails after d0e484ac699f ("check: wipe scratch devices
between tests") get merged.

Due to xfs/030 does a sized(100m) mkfs. Before we merge above commit,
mkfs.xfs detects an old primary superblock, it will write zeroes to
all superblocks before formatting the new filesystem. But this won't
be done if we wipe the first superblock(by merging above commit).

That means if we make a (smaller) sized xfs after wipefs, those *old*
superblocks which created by last time mkfs.xfs will be left on disk.
Then when we do xfs_repair, if xfs_repair can't find the first SB, it
will go to find those *old* SB at first. When it finds them,
everyting goes wrong.

So I try to wipe each XFS superblock if there's a XFS ondisk, then
try to erase superblock of each XFS AG by default mkfs.xfs geometry.
Thanks Darrick J. Wong helped to analyze this issue.

Reported-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
Signed-off-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

diff --git a/common/rc b/common/rc
index 8d57c371aef2f9d5f83b268c85c34b9c10c7acab..bbeabe6426dee1081d996be2538d7f7e052c33f3 100644 (file)
--- a/common/rc
+++ b/common/rc
@@ -4045,6 +4045,14 @@ _try_wipe_scratch_devs()
 {
        test -x "$WIPEFS_PROG" || return 0
 
 {
        test -x "$WIPEFS_PROG" || return 0
 

+       # Do specified filesystem wipe at first
+       case "$FSTYP" in
+       "xfs")
+               _try_wipe_scratch_xfs
+               ;;
+       esac
+
+       # Then do wipefs on all scratch devices

        for dev in $SCRATCH_DEV_POOL $SCRATCH_DEV $SCRATCH_LOGDEV $SCRATCH_RTDEV; do
                test -b $dev && $WIPEFS_PROG -a $dev
        done
        for dev in $SCRATCH_DEV_POOL $SCRATCH_DEV $SCRATCH_LOGDEV $SCRATCH_RTDEV; do
                test -b $dev && $WIPEFS_PROG -a $dev
        done

diff --git a/common/xfs b/common/xfs
index 1bce3c18f58742c5b1681f0f0dc03f3a97272c9f..706ddf8511d0d19691e0d02009ec2ac473cad03c 100644 (file)
--- a/common/xfs
+++ b/common/xfs
@@ -884,3 +884,43 @@ _xfs_mount_agcount()
 {
        $XFS_INFO_PROG "$1" | grep agcount= | sed -e 's/^.*agcount=\([0-9]*\),.*$/\1/g'
 }
 {
        $XFS_INFO_PROG "$1" | grep agcount= | sed -e 's/^.*agcount=\([0-9]*\),.*$/\1/g'
 }

+
+# Wipe the superblock of each XFS AGs
+_try_wipe_scratch_xfs()
+{
+       local num='^[0-9]+$'
+       local agcount
+       local agsize
+       local dbsize
+
+       # Try to wipe each SB if there's an existed XFS
+       agcount=`_scratch_xfs_get_sb_field agcount 2>/dev/null`
+       agsize=`_scratch_xfs_get_sb_field agblocks 2>/dev/null`
+       dbsize=`_scratch_xfs_get_sb_field blocksize 2>/dev/null`
+       if [[ $agcount =~ $num && $agsize =~ $num && $dbsize =~ $num ]];then
+               for ((i = 0; i < agcount; i++)); do
+                       $XFS_IO_PROG -c "pwrite $((i * dbsize * agsize)) $dbsize" \
+                               $SCRATCH_DEV >/dev/null;
+               done
+       fi
+
+       # Try to wipe each SB by default mkfs.xfs geometry
+       local tmp=`mktemp -u`
+       unset agcount agsize dbsize
+       _scratch_mkfs_xfs -N 2>/dev/null | perl -ne '
+               if (/^meta-data=.*\s+agcount=(\d+), agsize=(\d+) blks/) {
+                       print STDOUT "agcount=$1\nagsize=$2\n";
+               }
+               if (/^data\s+=\s+bsize=(\d+)\s/) {
+                       print STDOUT "dbsize=$1\n";
+               }' > $tmp.mkfs
+
+       . $tmp.mkfs
+       if [[ $agcount =~ $num && $agsize =~ $num && $dbsize =~ $num ]];then
+               for ((i = 0; i < agcount; i++)); do
+                       $XFS_IO_PROG -c "pwrite $((i * dbsize * agsize)) $dbsize" \
+                               $SCRATCH_DEV >/dev/null;
+               done
+       fi
+       rm -f $tmp.mkfs
+}