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[PATCH] xfstests: add background noise to test 276 (btrfs backref resolv

To: xfs@xxxxxxxxxxx
Subject: [PATCH] xfstests: add background noise to test 276 (btrfs backref resolving)
From: Jan Schmidt <list.btrfs@xxxxxxxxxxxxx>
Date: Tue, 19 Mar 2013 17:24:20 +0100
Cc: linux-btrfs@xxxxxxxxxxxxxxx, alex.btrfs@xxxxxxxxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
The backref resolver test for btrfs was run on a static file system so far.
Resolving backrefs on a busy file system is what happens in reality and that
is what should be checked by this test.

I added a parameter such that the script can easily be changed to the former
behavior for development purposes.

Furthermore, this increases two constants which make the test simply cycle a
few seconds longer, increasing the chance to hit on something suspicious in
case we broke something.

Signed-off-by: Jan Schmidt <list.btrfs@xxxxxxxxxxxxx>
---
 276 |   29 ++++++++++++++++++++++++++---
 1 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/276 b/276
index 65da464..40b30cf 100755
--- a/276
+++ b/276
@@ -33,9 +33,16 @@ echo "QA output created by $seq"
 here=`pwd`
 tmp=/tmp/$$
 status=1
+noise_pid=0
 
 _cleanup()
 {
+       if [ $noise_pid -ne 0 ]; then
+               echo "background noise kill $noise_pid" >>$seq.full
+               kill $noise_pid
+               noise_pid=0
+               wait
+       fi
        echo "*** unmount"
        umount $SCRATCH_MNT 2>/dev/null
        rm -f $tmp.*
@@ -171,6 +178,7 @@ workout()
        nfiles=$2
        procs=$3
        snap_name=$4
+       do_bg_noise=$5
 
        umount $SCRATCH_DEV >/dev/null 2>&1
        echo "*** mkfs -dsize=$fsz"    >>$seq.full
@@ -179,7 +187,7 @@ workout()
                || _fail "size=$fsz mkfs failed"
        run_check _scratch_mount
        # -w ensures that the only ops are ones which cause write I/O
-       run_check $FSSTRESS_PROG -d $SCRATCH_MNT -w -p $procs -n 1000 \
+       run_check $FSSTRESS_PROG -d $SCRATCH_MNT -w -p $procs -n 2000 \
                $FSSTRESS_AVOID
 
        run_check $BTRFS_UTIL_PROG subvol snap $SCRATCH_MNT \
@@ -190,9 +198,10 @@ workout()
 
        # make some noise but ensure we're not touching existing data
        # extents.
-       run_check $FSSTRESS_PROG -d $SCRATCH_MNT -p $procs -n 2000 \
+       run_check $FSSTRESS_PROG -d $SCRATCH_MNT -p $procs -n 4000 \
                -z -f chown=3 -f link=1 -f mkdir=2 -f mknod=2 \
                -f rename=2 -f setxattr=1 -f symlink=2
+
        clean_dir="$SCRATCH_MNT/next"
        mkdir $clean_dir
        # now make more files to get a higher tree
@@ -201,6 +210,18 @@ workout()
        run_check umount $SCRATCH_DEV >/dev/null 2>&1
        run_check _scratch_mount "-o atime"
 
+       if [ $do_bg_noise -ne 0 ]; then
+               # make background noise while backrefs are being walked
+               while /bin/true; do
+                       echo background fsstress >>$seq.full
+                       run_check $FSSTRESS_PROG -d $SCRATCH_MNT/bgnoise -n 999
+                       echo background rm >>$seq.full
+                       rm -rf $SCRATCH_MNT/bgnoise/
+               done &
+               noise_pid=`jobs -p %1`
+               echo "background noise by $noise_pid" >>$seq.full
+       fi
+
        cnt=0
        errcnt=0
        dir="$SCRATCH_MNT/$snap_name/"
@@ -230,6 +251,7 @@ workout()
                        break
                fi
        done
+
        if [ $errcnt -gt 0 ]; then
                _fail "test failed: $errcnt error(s)"
        fi
@@ -241,8 +263,9 @@ snap_name="snap1"
 filesize=`expr 2000 \* 1024 \* 1024`
 nfiles=4
 numprocs=1
+do_bg_noise=1
 
-workout $filesize $nfiles $numprocs $snap_name
+workout $filesize $nfiles $numprocs $snap_name $do_bg_noise
 
 echo "*** done"
 status=0
-- 
1.7.2.2

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