diff mbox series

[03/11] xfs: Check for extent overflow when trivally adding a new extent

Message ID 20201113112704.28798-4-chandanrlinux@gmail.com (mailing list archive)
State Superseded, archived
Headers show
Series xfs: Tests to check for inode fork extent count overflow detection | expand

Commit Message

Chandan Babu R Nov. 13, 2020, 11:26 a.m. UTC 
Verify that XFS does not cause inode fork's extent count to overflow
when adding a single extent while there's no possibility of splitting an
existing mapping (limited to realtime files only).

Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
---
 tests/xfs/523     | 176 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/523.out |  18 +++++
 tests/xfs/group   |   1 +
 3 files changed, 195 insertions(+)
 create mode 100755 tests/xfs/523
 create mode 100644 tests/xfs/523.out

Comments

Darrick J. Wong Nov. 14, 2020, 12:18 a.m. UTC | #1 
> Subject: xfs: Check for extent overflow when trivally adding a new extent

Why does patch 3 have the same subject as patch 2?  This confused
my quiltish scripts. :(

On Fri, Nov 13, 2020 at 04:56:55PM +0530, Chandan Babu R wrote:
> Verify that XFS does not cause inode fork's extent count to overflow
> when adding a single extent while there's no possibility of splitting an
> existing mapping (limited to realtime files only).
> 
> Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
> ---
>  tests/xfs/523     | 176 ++++++++++++++++++++++++++++++++++++++++++++++
>  tests/xfs/523.out |  18 +++++
>  tests/xfs/group   |   1 +
>  3 files changed, 195 insertions(+)
>  create mode 100755 tests/xfs/523
>  create mode 100644 tests/xfs/523.out
> 
> diff --git a/tests/xfs/523 b/tests/xfs/523
> new file mode 100755
> index 00000000..4f5b3584
> --- /dev/null
> +++ b/tests/xfs/523
> @@ -0,0 +1,176 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2020 Chandan Babu R.  All Rights Reserved.
> +#
> +# FS QA Test 523
> +#
> +# Verify that XFS does not cause inode fork's extent count to overflow when
> +# adding a single extent while there's no possibility of splitting an existing
> +# mapping (limited to realtime files only).
> +#
> +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 /
> +	_scratch_unmount >> $seqres.full 2>&1
> +	test -e "$rtdev" && losetup -d $rtdev >> $seqres.full 2>&1
> +	rm -f $tmp.* $TEST_DIR/$seq.rtvol
> +}
> +
> +# 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_test
> +_require_xfs_debug
> +_require_test_program "punch-alternating"
> +_require_xfs_io_error_injection "reduce_max_iextents"
> +_require_xfs_io_error_injection "bmap_alloc_minlen_extent"
> +_require_scratch_nocheck
> +
> +grow_rtinodes()
> +{
> +	echo "* Test extending rt inodes"
> +
> +	_scratch_mkfs | _filter_mkfs >> $seqres.full 2> $tmp.mkfs
> +	. $tmp.mkfs
> +
> +	echo "Create fake rt volume"
> +	nr_bitmap_blks=25
> +	nr_bits=$((nr_bitmap_blks * dbsize * 8))
> +	rtextsz=$dbsize
> +	rtdevsz=$((nr_bits * rtextsz))
> +	truncate -s $rtdevsz $TEST_DIR/$seq.rtvol
> +	rtdev=$(_create_loop_device $TEST_DIR/$seq.rtvol)
> +
> +	echo "Format and mount rt volume"
> +	export USE_EXTERNAL=yes
> +	export SCRATCH_RTDEV=$rtdev

I'm frankly wondering if it's time to just turn this into a
_scratch_synthesize_rtvol helper or something.

> +	_scratch_mkfs -d size=$((1024 * 1024 * 1024)) \
> +		      -r size=2M,extsize=${rtextsz} >> $seqres.full
> +	_scratch_mount >> $seqres.full
> +
> +	testfile=$SCRATCH_MNT/testfile
> +
> +	echo "Consume free space"
> +	dd if=/dev/zero of=${testfile} bs=${dbsize} >> $seqres.full 2>&1

Can you accomplish this with fallocate?  Or better yet _fill_fs()?

> +	sync
> +
> +	echo "Create fragmented filesystem"
> +	$here/src/punch-alternating $testfile >> $seqres.full
> +	sync
> +
> +	echo "Inject reduce_max_iextents error tag"
> +	xfs_io -x -c 'inject reduce_max_iextents' $SCRATCH_MNT
> +
> +	echo "Inject bmap_alloc_minlen_extent error tag"
> +	xfs_io -x -c 'inject bmap_alloc_minlen_extent' $SCRATCH_MNT
> +
> +	echo "Grow realtime volume"
> +	xfs_growfs -r $SCRATCH_MNT >> $seqres.full 2>&1

$XFS_GROWFS_PROG, not xfs_growfs

> +	if [[ $? == 0 ]]; then
> +		echo "Growfs succeeded; should have failed."
> +		exit 1
> +	fi
> +
> +	_scratch_unmount >> $seqres.full
> +
> +	echo "Verify rbmino's and rsumino's extent count"
> +	for rtino in rbmino rsumino; do
> +		ino=$(_scratch_xfs_db -c sb -c "print $rtino")
> +		ino=${ino##${rtino} = }
> +		echo "$rtino = $ino" >> $seqres.full
> +
> +		nextents=$(_scratch_get_iext_count $ino data || \
> +				_fail "Unable to obtain inode fork's extent count")

Aha, you use this helper for the rt inodes too.  Ok, disregard my
comments for patch 1.

> +		if (( $nextents > 10 )); then
> +			echo "Extent count overflow check failed: nextents = $nextents"
> +			exit 1
> +		fi
> +	done
> +
> +	echo "Check filesystem"
> +	_check_xfs_filesystem $SCRATCH_DEV none $rtdev
> +
> +	losetup -d $rtdev
> +	rm -f $TEST_DIR/$seq.rtvol
> +
> +	export USE_EXTERNAL=""
> +	export SCRATCH_RTDEV=""
> +}
> +
> +rtfile_extend()
> +{
> +	echo "* Test extending an rt file"
> +
> +	_scratch_mkfs | _filter_mkfs >> $seqres.full 2> $tmp.mkfs
> +	. $tmp.mkfs

Are these separate functionality tests?  If so, should they be in
separate test files?

> +
> +	echo "Create fake rt volume"
> +	nr_blks=$((15 * 2))
> +	rtextsz=$dbsize
> +	rtdevsz=$((2 * nr_blks * rtextsz))
> +	truncate -s $rtdevsz $TEST_DIR/$seq.rtvol
> +	rtdev=$(_create_loop_device $TEST_DIR/$seq.rtvol)
> +
> +	echo "Format and mount rt volume"
> +	export USE_EXTERNAL=yes
> +	export SCRATCH_RTDEV=$rtdev
> +	_scratch_mkfs -d size=$((1024 * 1024 * 1024)) \
> +		      -r size=$rtdevsz >> $seqres.full
> +	_scratch_mount >> $seqres.full
> +
> +	echo "Inject reduce_max_iextents error tag"
> +	xfs_io -x -c 'inject reduce_max_iextents' $SCRATCH_MNT

$XFS_IO_PROG, not xfs_io.

--D

> +
> +	echo "Create fragmented file on rt volume"
> +	testfile=$SCRATCH_MNT/testfile
> +	for i in $(seq 0 2 $((nr_blks - 1))); do
> +		xfs_io -Rf -c "pwrite $((i * dbsize)) $dbsize" -c fsync \
> +		       $testfile >> $seqres.full 2>&1
> +		[[ $? != 0 ]] && break
> +	done
> +
> +	testino=$(stat -c "%i" $testfile)
> +
> +	_scratch_unmount >> $seqres.full
> +
> +	echo "Verify \$testfile's extent count"
> +	nextents=$(_scratch_get_iext_count $testino data || \
> +			_fail "Unable to obtain inode fork's extent count")
> +	if (( $nextents > 10 )); then
> +		echo "Extent count overflow check failed: nextents = $nextents"
> +		exit 1
> +	fi
> +
> +	echo "Check filesystem"
> +	_check_xfs_filesystem $SCRATCH_DEV none $rtdev
> +
> +	losetup -d $rtdev
> +	rm -f $TEST_DIR/$seq.rtvol
> +
> +	export USE_EXTERNAL=""
> +	export SCRATCH_RTDEV=""
> +}
> +
> +grow_rtinodes
> +rtfile_extend
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/xfs/523.out b/tests/xfs/523.out
> new file mode 100644
> index 00000000..16b4e0ad
> --- /dev/null
> +++ b/tests/xfs/523.out
> @@ -0,0 +1,18 @@
> +QA output created by 523
> +* Test extending rt inodes
> +Create fake rt volume
> +Format and mount rt volume
> +Consume free space
> +Create fragmented filesystem
> +Inject reduce_max_iextents error tag
> +Inject bmap_alloc_minlen_extent error tag
> +Grow realtime volume
> +Verify rbmino's and rsumino's extent count
> +Check filesystem
> +* Test extending an rt file
> +Create fake rt volume
> +Format and mount rt volume
> +Inject reduce_max_iextents error tag
> +Create fragmented file on rt volume
> +Verify $testfile's extent count
> +Check filesystem
> diff --git a/tests/xfs/group b/tests/xfs/group
> index 1831f0b5..018c70ef 100644
> --- a/tests/xfs/group
> +++ b/tests/xfs/group
> @@ -520,3 +520,4 @@
>  520 auto quick reflink
>  521 auto quick realtime growfs
>  522 auto quick quota
> +523 auto quick realtime growfs
> -- 
> 2.28.0
>
Chandan Babu R Nov. 17, 2020, 2:22 p.m. UTC | #2 
On Saturday 14 November 2020 5:48:13 AM IST Darrick J. Wong wrote:
> > Subject: xfs: Check for extent overflow when trivally adding a new extent
> 
> Why does patch 3 have the same subject as patch 2?  This confused
> my quiltish scripts. :(

Sorry, The tests in patch 2 and 3 test the functionality associated with
XFS_IEXT_ADD_NOSPLIT_CNT. I had decided to separate these tests from those in
patch 2 since the tests here required creating an RT volume. I will fix the
subject line before posting the next version.

> 
> On Fri, Nov 13, 2020 at 04:56:55PM +0530, Chandan Babu R wrote:
> > Verify that XFS does not cause inode fork's extent count to overflow
> > when adding a single extent while there's no possibility of splitting an
> > existing mapping (limited to realtime files only).
> > 
> > Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
> > ---
> >  tests/xfs/523     | 176 ++++++++++++++++++++++++++++++++++++++++++++++
> >  tests/xfs/523.out |  18 +++++
> >  tests/xfs/group   |   1 +
> >  3 files changed, 195 insertions(+)
> >  create mode 100755 tests/xfs/523
> >  create mode 100644 tests/xfs/523.out
> > 
> > diff --git a/tests/xfs/523 b/tests/xfs/523
> > new file mode 100755
> > index 00000000..4f5b3584
> > --- /dev/null
> > +++ b/tests/xfs/523
> > @@ -0,0 +1,176 @@
> > +#! /bin/bash
> > +# SPDX-License-Identifier: GPL-2.0
> > +# Copyright (c) 2020 Chandan Babu R.  All Rights Reserved.
> > +#
> > +# FS QA Test 523
> > +#
> > +# Verify that XFS does not cause inode fork's extent count to overflow when
> > +# adding a single extent while there's no possibility of splitting an existing
> > +# mapping (limited to realtime files only).
> > +#
> > +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 /
> > +	_scratch_unmount >> $seqres.full 2>&1
> > +	test -e "$rtdev" && losetup -d $rtdev >> $seqres.full 2>&1
> > +	rm -f $tmp.* $TEST_DIR/$seq.rtvol
> > +}
> > +
> > +# 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_test
> > +_require_xfs_debug
> > +_require_test_program "punch-alternating"
> > +_require_xfs_io_error_injection "reduce_max_iextents"
> > +_require_xfs_io_error_injection "bmap_alloc_minlen_extent"
> > +_require_scratch_nocheck
> > +
> > +grow_rtinodes()
> > +{
> > +	echo "* Test extending rt inodes"
> > +
> > +	_scratch_mkfs | _filter_mkfs >> $seqres.full 2> $tmp.mkfs
> > +	. $tmp.mkfs
> > +
> > +	echo "Create fake rt volume"
> > +	nr_bitmap_blks=25
> > +	nr_bits=$((nr_bitmap_blks * dbsize * 8))
> > +	rtextsz=$dbsize
> > +	rtdevsz=$((nr_bits * rtextsz))
> > +	truncate -s $rtdevsz $TEST_DIR/$seq.rtvol
> > +	rtdev=$(_create_loop_device $TEST_DIR/$seq.rtvol)
> > +
> > +	echo "Format and mount rt volume"
> > +	export USE_EXTERNAL=yes
> > +	export SCRATCH_RTDEV=$rtdev
> 
> I'm frankly wondering if it's time to just turn this into a
> _scratch_synthesize_rtvol helper or something.

Ok. I will write the helper and invoke it from appropriate places in xfstests.

> 
> > +	_scratch_mkfs -d size=$((1024 * 1024 * 1024)) \
> > +		      -r size=2M,extsize=${rtextsz} >> $seqres.full
> > +	_scratch_mount >> $seqres.full
> > +
> > +	testfile=$SCRATCH_MNT/testfile
> > +
> > +	echo "Consume free space"
> > +	dd if=/dev/zero of=${testfile} bs=${dbsize} >> $seqres.full 2>&1
> 
> Can you accomplish this with fallocate?  Or better yet _fill_fs()?

Hmm. _fill_fs() would be a better candidate. I can then invoke
punch-alternating on all the files in the directory (passed as 2nd argument to
_fill_fs()) to create a fragmented filesystem. Thanks for the suggestion.

> 
> > +	sync
> > +
> > +	echo "Create fragmented filesystem"
> > +	$here/src/punch-alternating $testfile >> $seqres.full
> > +	sync
> > +
> > +	echo "Inject reduce_max_iextents error tag"
> > +	xfs_io -x -c 'inject reduce_max_iextents' $SCRATCH_MNT
> > +
> > +	echo "Inject bmap_alloc_minlen_extent error tag"
> > +	xfs_io -x -c 'inject bmap_alloc_minlen_extent' $SCRATCH_MNT
> > +
> > +	echo "Grow realtime volume"
> > +	xfs_growfs -r $SCRATCH_MNT >> $seqres.full 2>&1
> 
> $XFS_GROWFS_PROG, not xfs_growfs

Ok. I will fix this.

> 
> > +	if [[ $? == 0 ]]; then
> > +		echo "Growfs succeeded; should have failed."
> > +		exit 1
> > +	fi
> > +
> > +	_scratch_unmount >> $seqres.full
> > +
> > +	echo "Verify rbmino's and rsumino's extent count"
> > +	for rtino in rbmino rsumino; do
> > +		ino=$(_scratch_xfs_db -c sb -c "print $rtino")
> > +		ino=${ino##${rtino} = }
> > +		echo "$rtino = $ino" >> $seqres.full
> > +
> > +		nextents=$(_scratch_get_iext_count $ino data || \
> > +				_fail "Unable to obtain inode fork's extent count")
> 
> Aha, you use this helper for the rt inodes too.  Ok, disregard my
> comments for patch 1.
> 
> > +		if (( $nextents > 10 )); then
> > +			echo "Extent count overflow check failed: nextents = $nextents"
> > +			exit 1
> > +		fi
> > +	done
> > +
> > +	echo "Check filesystem"
> > +	_check_xfs_filesystem $SCRATCH_DEV none $rtdev
> > +
> > +	losetup -d $rtdev
> > +	rm -f $TEST_DIR/$seq.rtvol
> > +
> > +	export USE_EXTERNAL=""
> > +	export SCRATCH_RTDEV=""
> > +}
> > +
> > +rtfile_extend()
> > +{
> > +	echo "* Test extending an rt file"
> > +
> > +	_scratch_mkfs | _filter_mkfs >> $seqres.full 2> $tmp.mkfs
> > +	. $tmp.mkfs
> 
> Are these separate functionality tests?  If so, should they be in
> separate test files?

Actually I will drop the rtfile_extend() test functionality since it takes the
same code path as the direct IO file operation tested in patch 2.

> 
> > +
> > +	echo "Create fake rt volume"
> > +	nr_blks=$((15 * 2))
> > +	rtextsz=$dbsize
> > +	rtdevsz=$((2 * nr_blks * rtextsz))
> > +	truncate -s $rtdevsz $TEST_DIR/$seq.rtvol
> > +	rtdev=$(_create_loop_device $TEST_DIR/$seq.rtvol)
> > +
> > +	echo "Format and mount rt volume"
> > +	export USE_EXTERNAL=yes
> > +	export SCRATCH_RTDEV=$rtdev
> > +	_scratch_mkfs -d size=$((1024 * 1024 * 1024)) \
> > +		      -r size=$rtdevsz >> $seqres.full
> > +	_scratch_mount >> $seqres.full
> > +
> > +	echo "Inject reduce_max_iextents error tag"
> > +	xfs_io -x -c 'inject reduce_max_iextents' $SCRATCH_MNT
> 
> $XFS_IO_PROG, not xfs_io.

Ok. I will fix this in all the test scripts in this patchset.

> 
> --D
> 
> > +
> > +	echo "Create fragmented file on rt volume"
> > +	testfile=$SCRATCH_MNT/testfile
> > +	for i in $(seq 0 2 $((nr_blks - 1))); do
> > +		xfs_io -Rf -c "pwrite $((i * dbsize)) $dbsize" -c fsync \
> > +		       $testfile >> $seqres.full 2>&1
> > +		[[ $? != 0 ]] && break
> > +	done
> > +
> > +	testino=$(stat -c "%i" $testfile)
> > +
> > +	_scratch_unmount >> $seqres.full
> > +
> > +	echo "Verify \$testfile's extent count"
> > +	nextents=$(_scratch_get_iext_count $testino data || \
> > +			_fail "Unable to obtain inode fork's extent count")
> > +	if (( $nextents > 10 )); then
> > +		echo "Extent count overflow check failed: nextents = $nextents"
> > +		exit 1
> > +	fi
> > +
> > +	echo "Check filesystem"
> > +	_check_xfs_filesystem $SCRATCH_DEV none $rtdev
> > +
> > +	losetup -d $rtdev
> > +	rm -f $TEST_DIR/$seq.rtvol
> > +
> > +	export USE_EXTERNAL=""
> > +	export SCRATCH_RTDEV=""
> > +}
> > +
> > +grow_rtinodes
> > +rtfile_extend
> > +
> > +# success, all done
> > +status=0
> > +exit
> > diff --git a/tests/xfs/523.out b/tests/xfs/523.out
> > new file mode 100644
> > index 00000000..16b4e0ad
> > --- /dev/null
> > +++ b/tests/xfs/523.out
> > @@ -0,0 +1,18 @@
> > +QA output created by 523
> > +* Test extending rt inodes
> > +Create fake rt volume
> > +Format and mount rt volume
> > +Consume free space
> > +Create fragmented filesystem
> > +Inject reduce_max_iextents error tag
> > +Inject bmap_alloc_minlen_extent error tag
> > +Grow realtime volume
> > +Verify rbmino's and rsumino's extent count
> > +Check filesystem
> > +* Test extending an rt file
> > +Create fake rt volume
> > +Format and mount rt volume
> > +Inject reduce_max_iextents error tag
> > +Create fragmented file on rt volume
> > +Verify $testfile's extent count
> > +Check filesystem
> > diff --git a/tests/xfs/group b/tests/xfs/group
> > index 1831f0b5..018c70ef 100644
> > --- a/tests/xfs/group
> > +++ b/tests/xfs/group
> > @@ -520,3 +520,4 @@
> >  520 auto quick reflink
> >  521 auto quick realtime growfs
> >  522 auto quick quota
> > +523 auto quick realtime growfs
>
diff mbox series

Patch

diff --git a/tests/xfs/523 b/tests/xfs/523
new file mode 100755
index 00000000..4f5b3584
--- /dev/null
+++ b/tests/xfs/523
@@ -0,0 +1,176 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2020 Chandan Babu R.  All Rights Reserved.
+#
+# FS QA Test 523
+#
+# Verify that XFS does not cause inode fork's extent count to overflow when
+# adding a single extent while there's no possibility of splitting an existing
+# mapping (limited to realtime files only).
+#
+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 /
+	_scratch_unmount >> $seqres.full 2>&1
+	test -e "$rtdev" && losetup -d $rtdev >> $seqres.full 2>&1
+	rm -f $tmp.* $TEST_DIR/$seq.rtvol
+}
+
+# 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_test
+_require_xfs_debug
+_require_test_program "punch-alternating"
+_require_xfs_io_error_injection "reduce_max_iextents"
+_require_xfs_io_error_injection "bmap_alloc_minlen_extent"
+_require_scratch_nocheck
+
+grow_rtinodes()
+{
+	echo "* Test extending rt inodes"
+
+	_scratch_mkfs | _filter_mkfs >> $seqres.full 2> $tmp.mkfs
+	. $tmp.mkfs
+
+	echo "Create fake rt volume"
+	nr_bitmap_blks=25
+	nr_bits=$((nr_bitmap_blks * dbsize * 8))
+	rtextsz=$dbsize
+	rtdevsz=$((nr_bits * rtextsz))
+	truncate -s $rtdevsz $TEST_DIR/$seq.rtvol
+	rtdev=$(_create_loop_device $TEST_DIR/$seq.rtvol)
+
+	echo "Format and mount rt volume"
+	export USE_EXTERNAL=yes
+	export SCRATCH_RTDEV=$rtdev
+	_scratch_mkfs -d size=$((1024 * 1024 * 1024)) \
+		      -r size=2M,extsize=${rtextsz} >> $seqres.full
+	_scratch_mount >> $seqres.full
+
+	testfile=$SCRATCH_MNT/testfile
+
+	echo "Consume free space"
+	dd if=/dev/zero of=${testfile} bs=${dbsize} >> $seqres.full 2>&1
+	sync
+
+	echo "Create fragmented filesystem"
+	$here/src/punch-alternating $testfile >> $seqres.full
+	sync
+
+	echo "Inject reduce_max_iextents error tag"
+	xfs_io -x -c 'inject reduce_max_iextents' $SCRATCH_MNT
+
+	echo "Inject bmap_alloc_minlen_extent error tag"
+	xfs_io -x -c 'inject bmap_alloc_minlen_extent' $SCRATCH_MNT
+
+	echo "Grow realtime volume"
+	xfs_growfs -r $SCRATCH_MNT >> $seqres.full 2>&1
+	if [[ $? == 0 ]]; then
+		echo "Growfs succeeded; should have failed."
+		exit 1
+	fi
+
+	_scratch_unmount >> $seqres.full
+
+	echo "Verify rbmino's and rsumino's extent count"
+	for rtino in rbmino rsumino; do
+		ino=$(_scratch_xfs_db -c sb -c "print $rtino")
+		ino=${ino##${rtino} = }
+		echo "$rtino = $ino" >> $seqres.full
+
+		nextents=$(_scratch_get_iext_count $ino data || \
+				_fail "Unable to obtain inode fork's extent count")
+		if (( $nextents > 10 )); then
+			echo "Extent count overflow check failed: nextents = $nextents"
+			exit 1
+		fi
+	done
+
+	echo "Check filesystem"
+	_check_xfs_filesystem $SCRATCH_DEV none $rtdev
+
+	losetup -d $rtdev
+	rm -f $TEST_DIR/$seq.rtvol
+
+	export USE_EXTERNAL=""
+	export SCRATCH_RTDEV=""
+}
+
+rtfile_extend()
+{
+	echo "* Test extending an rt file"
+
+	_scratch_mkfs | _filter_mkfs >> $seqres.full 2> $tmp.mkfs
+	. $tmp.mkfs
+
+	echo "Create fake rt volume"
+	nr_blks=$((15 * 2))
+	rtextsz=$dbsize
+	rtdevsz=$((2 * nr_blks * rtextsz))
+	truncate -s $rtdevsz $TEST_DIR/$seq.rtvol
+	rtdev=$(_create_loop_device $TEST_DIR/$seq.rtvol)
+
+	echo "Format and mount rt volume"
+	export USE_EXTERNAL=yes
+	export SCRATCH_RTDEV=$rtdev
+	_scratch_mkfs -d size=$((1024 * 1024 * 1024)) \
+		      -r size=$rtdevsz >> $seqres.full
+	_scratch_mount >> $seqres.full
+
+	echo "Inject reduce_max_iextents error tag"
+	xfs_io -x -c 'inject reduce_max_iextents' $SCRATCH_MNT
+
+	echo "Create fragmented file on rt volume"
+	testfile=$SCRATCH_MNT/testfile
+	for i in $(seq 0 2 $((nr_blks - 1))); do
+		xfs_io -Rf -c "pwrite $((i * dbsize)) $dbsize" -c fsync \
+		       $testfile >> $seqres.full 2>&1
+		[[ $? != 0 ]] && break
+	done
+
+	testino=$(stat -c "%i" $testfile)
+
+	_scratch_unmount >> $seqres.full
+
+	echo "Verify \$testfile's extent count"
+	nextents=$(_scratch_get_iext_count $testino data || \
+			_fail "Unable to obtain inode fork's extent count")
+	if (( $nextents > 10 )); then
+		echo "Extent count overflow check failed: nextents = $nextents"
+		exit 1
+	fi
+
+	echo "Check filesystem"
+	_check_xfs_filesystem $SCRATCH_DEV none $rtdev
+
+	losetup -d $rtdev
+	rm -f $TEST_DIR/$seq.rtvol
+
+	export USE_EXTERNAL=""
+	export SCRATCH_RTDEV=""
+}
+
+grow_rtinodes
+rtfile_extend
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/523.out b/tests/xfs/523.out
new file mode 100644
index 00000000..16b4e0ad
--- /dev/null
+++ b/tests/xfs/523.out
@@ -0,0 +1,18 @@ 
+QA output created by 523
+* Test extending rt inodes
+Create fake rt volume
+Format and mount rt volume
+Consume free space
+Create fragmented filesystem
+Inject reduce_max_iextents error tag
+Inject bmap_alloc_minlen_extent error tag
+Grow realtime volume
+Verify rbmino's and rsumino's extent count
+Check filesystem
+* Test extending an rt file
+Create fake rt volume
+Format and mount rt volume
+Inject reduce_max_iextents error tag
+Create fragmented file on rt volume
+Verify $testfile's extent count
+Check filesystem
diff --git a/tests/xfs/group b/tests/xfs/group
index 1831f0b5..018c70ef 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -520,3 +520,4 @@ 
 520 auto quick reflink
 521 auto quick realtime growfs
 522 auto quick quota
+523 auto quick realtime growfs