new file mode 100755
@@ -0,0 +1,109 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2020 Chandan Babu R. All Rights Reserved.
+#
+# FS QA Test 530
+#
+# Verify that XFS does not cause inode fork's extent count to overflow when
+# swapping forks between files
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+ cd /
+ rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/inject
+
+# remove previous $seqres.full before test
+rm -f $seqres.full
+
+# real QA test starts here
+
+_supported_fs xfs
+_require_scratch
+_require_xfs_debug
+_require_xfs_scratch_rmapbt
+_require_xfs_io_command "fcollapse"
+_require_xfs_io_command "swapext"
+_require_xfs_io_error_injection "reduce_max_iextents"
+
+echo "* Swap extent forks"
+
+echo "Format and mount fs"
+_scratch_mkfs >> $seqres.full
+_scratch_mount >> $seqres.full
+
+bsize=$(_get_block_size $SCRATCH_MNT)
+
+srcfile=${SCRATCH_MNT}/srcfile
+donorfile=${SCRATCH_MNT}/donorfile
+
+echo "Create \$donorfile having an extent of length 67 blocks"
+$XFS_IO_PROG -f -s -c "pwrite -b $((67 * bsize)) 0 $((67 * bsize))" $donorfile \
+ >> $seqres.full
+
+# After the for loop the donor file will have the following extent layout
+# | 0-4 | 5 | 6 | 7 | ... | 34 | 35 |
+echo "Fragment \$donorfile"
+for i in $(seq 5 35); do
+ start_offset=$((i * bsize))
+ $XFS_IO_PROG -f -c "fcollapse $start_offset $bsize" $donorfile >> $seqres.full
+done
+
+echo "Create \$srcfile having an extent of length 67 blocks"
+$XFS_IO_PROG -f -s -c "pwrite -b $((67 * bsize)) 0 $((67 * bsize))" $srcfile \
+ >> $seqres.full
+
+echo "Fragment \$srcfile"
+# After the for loop the src file will have the following extent layout
+# | 0 | 1 | 2 | ... | 29 | 30 | 31-35 |
+for i in $(seq 1 31); do
+ start_offset=$((i * bsize))
+ $XFS_IO_PROG -f -c "fcollapse $start_offset $bsize" $srcfile >> $seqres.full
+done
+
+echo "Collect \$donorfile's extent count"
+donor_nr_exts=$($XFS_IO_PROG -c 'stat' $donorfile | grep nextents)
+donor_nr_exts=${donor_nr_exts##fsxattr.nextents = }
+
+echo "Collect \$srcfile's extent count"
+src_nr_exts=$($XFS_IO_PROG -c 'stat' $srcfile | grep nextents)
+src_nr_exts=${src_nr_exts##fsxattr.nextents = }
+
+echo "Inject reduce_max_iextents error tag"
+_scratch_inject_error reduce_max_iextents 1
+
+echo "Swap \$srcfile's and \$donorfile's extent forks"
+$XFS_IO_PROG -f -c "swapext $donorfile" $srcfile >> $seqres.full 2>&1
+
+echo "Check for \$donorfile's extent count overflow"
+nextents=$($XFS_IO_PROG -c 'stat' $donorfile | grep nextents)
+nextents=${nextents##fsxattr.nextents = }
+
+if (( $nextents == $src_nr_exts )); then
+ echo "\$donorfile: Extent count overflow check failed"
+fi
+
+echo "Check for \$srcfile's extent count overflow"
+nextents=$($XFS_IO_PROG -c 'stat' $srcfile | grep nextents)
+nextents=${nextents##fsxattr.nextents = }
+
+if (( $nextents == $donor_nr_exts )); then
+ echo "\$srcfile: Extent count overflow check failed"
+fi
+
+# success, all done
+status=0
+exit
new file mode 100644
@@ -0,0 +1,13 @@
+QA output created by 530
+* Swap extent forks
+Format and mount fs
+Create $donorfile having an extent of length 67 blocks
+Fragment $donorfile
+Create $srcfile having an extent of length 67 blocks
+Fragment $srcfile
+Collect $donorfile's extent count
+Collect $srcfile's extent count
+Inject reduce_max_iextents error tag
+Swap $srcfile's and $donorfile's extent forks
+Check for $donorfile's extent count overflow
+Check for $srcfile's extent count overflow
@@ -527,6 +527,7 @@
527 auto quick
528 auto quick reflink
529 auto quick reflink
+530 auto quick
758 auto quick rw attr realtime
759 auto quick rw realtime
760 auto quick rw collapse punch insert zero prealloc
This test verifies that XFS does not cause inode fork's extent count to overflow when swapping forks across two files. Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com> --- tests/xfs/530 | 109 ++++++++++++++++++++++++++++++++++++++++++++++ tests/xfs/530.out | 13 ++++++ tests/xfs/group | 1 + 3 files changed, 123 insertions(+) create mode 100755 tests/xfs/530 create mode 100644 tests/xfs/530.out