[PATCH v2] xfstests: test speculative preallocation reclaim on ENOSPC/EDQUOT

[PATCH v2] xfstests: test speculative preallocation reclaim on ENOSPC/EDQUOT

[Brian Foster]

XFS can allocate significant amounts of space to files via speculative
preallocation. Such preallocation may not be reclaimed automatically on
file close() if a file is repeatedly opened and extended. For smaller
filesystems with relatively large and slow growing files, this
preallocation can linger for some time, including contributing to out of
space conditions.

Create a situation where an fs is near out of space while several files
still have lingering, significant preallocations. Verify that new
writers reclaim the preallocated space rather than return ENOSPC. Repeat
a similar test for quota limits and EDQUOT.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---

v2:
- Added a post-test scratch fs check.
- Use a loop device to reduce the space requirement.
- Added support for analogous EDQUOT test and added to quota group.
- Some refactoring, cleanups, etc.
v1: http://oss.sgi.com/archives/xfs/2014-05/msg00531.html

 tests/xfs/014     | 212 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/014.out |   1 +
 tests/xfs/group   |   1 +
 3 files changed, 214 insertions(+)
 create mode 100755 tests/xfs/014
 create mode 100644 tests/xfs/014.out

diff --git a/tests/xfs/014 b/tests/xfs/014
new file mode 100755
index 0000000..ef08bee
--- /dev/null
+++ b/tests/xfs/014
@@ -0,0 +1,212 @@
+#!/bin/bash
+# FS QA Test No. xfs/014
+#
+# Test the behavior of XFS dynamic speculative preallocation at ENOSPC and
+# EDQUOT conditions. Speculative preallocation allocates post-EOF space to files
+# as they are extended. This test creates conditions where an fs is near a space
+# limit with lingering, relatively significant preallocations and verifies that
+# new writers reclaim said preallocations rather than prematurely fail with
+# ENOSPC/EDQUOT.
+#
+#-----------------------------------------------------------------------
+# Copyright (c) 2014 Red Hat, Inc.  All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+#-----------------------------------------------------------------------
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/quota
+
+_cleanup()
+{
+	cd /
+	umount $LOOP_MNT 2>/dev/null
+	umount $SCRATCH_MNT 2>/dev/null
+	rm -f $tmp.*
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# Create a file using a repeated open, extending write and close pattern. This
+# causes the preallocation to persist after the file is closed. Preallocation
+# will not be reclaimed unless the inode is evicted or we hit an allocation
+# failure.
+_spec_prealloc_file()
+{
+	file=$1
+
+	rm -f $file
+
+	# a few file extending open-write-close cycles should be enough to
+	# trigger the fs to retain preallocation. write 256k in 32k intervals to
+	# be sure
+	for i in $(seq 0 32768 262144)
+	do
+		$XFS_IO_PROG -fc "pwrite $i 32k" $file | \
+			_filter_xfs_io >> $seqres.full
+	done
+
+	# write a 4k aligned amount of data to keep the calculations simple
+	$XFS_IO_PROG -c "pwrite 0 128m" $file | _filter_xfs_io >> $seqres.full
+
+	size=`stat -c "%s" $file`
+	blocks=`stat -c "%b" $file`
+	blocksize=`stat -c "%B" $file`
+
+	prealloc_size=$((blocks * blocksize - size))
+	if [ $prealloc_size -eq 0 ]
+	then
+		echo "Warning: No speculative preallocation for $file." \
+			"Check use of the allocsize= mount option."
+	fi
+
+	# keep a running total of how much preallocation we've created
+	TOTAL_PREALLOC=$((TOTAL_PREALLOC + prealloc_size))
+}
+
+_consume_free_space()
+{
+	dir=$1
+
+	# calculate the rough amount of free space in MB
+	fsblocksize=`$XFS_IO_PROG -x -c "statfs" $dir | grep f_bsize | \
+			awk '{ print $3 }'`
+	blocksavail=`$XFS_IO_PROG -x -c "statfs" $dir | grep f_bavail | \
+			awk '{ print $3 }'`
+	freesp=$((fsblocksize * blocksavail / 1024 / 1024))
+
+	# allocate all but 10MB
+	freesp=$((freesp - 10))
+	$XFS_IO_PROG -fc "falloc 0 ${freesp}M" $dir/spc
+}
+
+# Create several files with preallocation and consume the remaining free space
+# via fallocate to the put the fs at ENOSPC. Create a set of background writers
+# to write into ENOSPC and cause the preallocation to be reclaimed and
+# reallocated to the new writers.
+_test_enospc()
+{
+	dir=$1
+
+	rm -rf $dir/*
+
+	TOTAL_PREALLOC=0
+	for i in $(seq 0 3)
+	do
+		_spec_prealloc_file $dir/pre$i
+	done
+
+	_consume_free_space $dir
+
+	# consume 1/2 of the current preallocation across the set of 4 writers
+	write_size=$((TOTAL_PREALLOC / 2 / 4))
+	for i in $(seq 0 3)
+	do
+		$XFS_IO_PROG -fc "pwrite 0 $write_size" $dir/file.$i | \
+			_filter_xfs_io >> $seqres.full &
+	done
+
+	wait
+}
+
+# Create preallocations accounted by both user and group quotas. Set the
+# associated quota hard limits to put them at EDQUOT. Verify that a new writer
+# reclaims the preallocated space and proceeds without error.
+_test_edquot()
+{
+	dir=$1
+
+	rm -rf $dir/*
+
+	TOTAL_PREALLOC=0
+	_spec_prealloc_file $dir/user
+	chown $qa_user $dir/user
+
+	_spec_prealloc_file $dir/group
+	chgrp $qa_group $dir/group
+
+	# writing to a file under both quotas means both will be reclaimed on
+	# allocation failure
+	touch $dir/file
+	chown $qa_user $dir/file
+	chgrp $qa_group $dir/file
+
+	# put both quotas at EDQUOT
+	blks=`$XFS_QUOTA_PROG -xc "quota -u $qa_user" $dir | \
+		tail -n 1 | awk '{ print $2 }'`
+	$XFS_QUOTA_PROG -xc "limit -u bhard=${blks}k $qa_user" $dir
+	blks=`$XFS_QUOTA_PROG -xc "quota -g $qa_grup" $dir | \
+		tail -n 1 | awk '{ print $2 }'`
+	$XFS_QUOTA_PROG -xc "limit -g bhard=${blks}k $qa_group" $dir
+
+	# each quota has a single file worth of preallocation to reclaim. leave
+	# some wiggle room and write to 1/3 the total.
+	write_size=$((TOTAL_PREALLOC / 3))
+	$XFS_IO_PROG -c "pwrite 0 $write_size" $dir/file | \
+		_filter_xfs_io >> $seqres.full
+}
+
+# real QA test starts here
+_supported_fs xfs
+_supported_os Linux
+
+_require_scratch
+_require_xfs_io_command "falloc"
+_require_loop
+_require_quota
+_require_user
+_require_group
+
+rm -f $seqres.full
+
+_scratch_mkfs_xfs | _filter_mkfs >> $seqres.full 2>&1
+_scratch_mount
+
+# make sure the background eofblocks scanner doesn't interfere
+orig_sp_time=`cat /proc/sys/fs/xfs/speculative_prealloc_lifetime`
+echo 9999 > /proc/sys/fs/xfs/speculative_prealloc_lifetime
+
+LOOP_FILE=$SCRATCH_MNT/$seq.fs
+LOOP_MNT=$SCRATCH_MNT/$seq.mnt
+
+$MKFS_XFS_PROG -d "file=1,name=$LOOP_FILE,size=$((1024*1024*1024 * 10))" | \
+	_filter_mkfs >> $seqres.full 2>&1
+
+mkdir -p $LOOP_MNT
+mount -t xfs -o loop,uquota,gquota $LOOP_FILE $LOOP_MNT || \
+	_fail "Failed to mount loop fs."
+
+_test_enospc $LOOP_MNT
+_test_edquot $LOOP_MNT
+
+umount $LOOP_MNT
+
+echo $orig_sp_time > /proc/sys/fs/xfs/speculative_prealloc_lifetime
+
+umount $SCRATCH_MNT
+_check_scratch_fs
+
+status=0
+exit
diff --git a/tests/xfs/014.out b/tests/xfs/014.out
new file mode 100644
index 0000000..a825535
--- /dev/null
+++ b/tests/xfs/014.out
@@ -0,0 +1 @@
+QA output created by 014
diff --git a/tests/xfs/group b/tests/xfs/group
index 19fd968..13f07b8 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -10,6 +10,7 @@
 010 auto quick repair
 012 rw auto quick
 013 auto metadata stress
+014 auto enospc quick quota
 016 rw auto quick
 017 mount auto quick stress
 018 deprecated # log logprint v2log
-- 
1.8.3.1

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Re: [PATCH v2] xfstests: test speculative preallocation reclaim on ENOSPC/EDQUOT

[Dave Chinner]

On Tue, Jun 03, 2014 at 10:53:58AM -0400, Brian Foster wrote:
> XFS can allocate significant amounts of space to files via speculative
> preallocation. Such preallocation may not be reclaimed automatically on
> file close() if a file is repeatedly opened and extended. For smaller
> filesystems with relatively large and slow growing files, this
> preallocation can linger for some time, including contributing to out of
> space conditions.
> 
> Create a situation where an fs is near out of space while several files
> still have lingering, significant preallocations. Verify that new
> writers reclaim the preallocated space rather than return ENOSPC. Repeat
> a similar test for quota limits and EDQUOT.
> 
> Signed-off-by: Brian Foster <bfoster@redhat.com>

Couple of minor things.

> +# Create a file using a repeated open, extending write and close pattern. This
> +# causes the preallocation to persist after the file is closed. Preallocation
> +# will not be reclaimed unless the inode is evicted or we hit an allocation
> +# failure.
> +_spec_prealloc_file()
> +{
> +	file=$1
> +
> +	rm -f $file
> +
> +	# a few file extending open-write-close cycles should be enough to
> +	# trigger the fs to retain preallocation. write 256k in 32k intervals to
> +	# be sure
> +	for i in $(seq 0 32768 262144)
> +	do

	for .... ; do

> +		$XFS_IO_PROG -fc "pwrite $i 32k" $file | \
> +			_filter_xfs_io >> $seqres.full
> +	done

If you are dumping the output into $seqres.full, then it doesn't
need to be filtered. Filtering is only necessary for golden image
matching; $seqres.full is for debug output and so should be
pristine...

Also, I prefer $XFS_IO_PROG -f -c "..." (separate -c "...") because
the -c arg must be followed by the command and so order is
important...

> +	# write a 4k aligned amount of data to keep the calculations simple
> +	$XFS_IO_PROG -c "pwrite 0 128m" $file | _filter_xfs_io >> $seqres.full
> +
> +	size=`stat -c "%s" $file`
> +	blocks=`stat -c "%b" $file`
> +	blocksize=`stat -c "%B" $file`
> +
> +	prealloc_size=$((blocks * blocksize - size))
> +	if [ $prealloc_size -eq 0 ]
> +	then

	if [ ... ]; then

> +		echo "Warning: No speculative preallocation for $file." \
> +			"Check use of the allocsize= mount option."
> +	fi
> +
> +	# keep a running total of how much preallocation we've created
> +	TOTAL_PREALLOC=$((TOTAL_PREALLOC + prealloc_size))
> +}
> +
> +_consume_free_space()
> +{
> +	dir=$1
> +
> +	# calculate the rough amount of free space in MB
> +	fsblocksize=`$XFS_IO_PROG -x -c "statfs" $dir | grep f_bsize | \
> +			awk '{ print $3 }'`
> +	blocksavail=`$XFS_IO_PROG -x -c "statfs" $dir | grep f_bavail | \
> +			awk '{ print $3 }'`
> +	freesp=$((fsblocksize * blocksavail / 1024 / 1024))
> +
> +	# allocate all but 10MB
> +	freesp=$((freesp - 10))

	freesp=`$DF_PROG -m $dir | awk '/^\// { print $4 - 10 }'`
 
> +	$XFS_IO_PROG -fc "falloc 0 ${freesp}M" $dir/spc
> +}
> +
> +# Create several files with preallocation and consume the remaining free space
> +# via fallocate to the put the fs at ENOSPC. Create a set of background writers
> +# to write into ENOSPC and cause the preallocation to be reclaimed and
> +# reallocated to the new writers.
> +_test_enospc()
> +{
> +	dir=$1
> +
> +	rm -rf $dir/*
> +
> +	TOTAL_PREALLOC=0
> +	for i in $(seq 0 3)
> +	do

for (); do

> +		_spec_prealloc_file $dir/pre$i
> +	done
> +
> +	_consume_free_space $dir
> +
> +	# consume 1/2 of the current preallocation across the set of 4 writers
> +	write_size=$((TOTAL_PREALLOC / 2 / 4))
> +	for i in $(seq 0 3)
> +	do
> +		$XFS_IO_PROG -fc "pwrite 0 $write_size" $dir/file.$i | \
> +			_filter_xfs_io >> $seqres.full &

no filter, for (); do

> +	done
> +
> +	wait
> +}
> +
> +# Create preallocations accounted by both user and group quotas. Set the
> +# associated quota hard limits to put them at EDQUOT. Verify that a new writer
> +# reclaims the preallocated space and proceeds without error.
> +_test_edquot()
> +{
> +	dir=$1
> +
> +	rm -rf $dir/*
> +
> +	TOTAL_PREALLOC=0
> +	_spec_prealloc_file $dir/user
> +	chown $qa_user $dir/user
> +
> +	_spec_prealloc_file $dir/group
> +	chgrp $qa_group $dir/group
> +
> +	# writing to a file under both quotas means both will be reclaimed on
> +	# allocation failure
> +	touch $dir/file
> +	chown $qa_user $dir/file
> +	chgrp $qa_group $dir/file
> +
> +	# put both quotas at EDQUOT
> +	blks=`$XFS_QUOTA_PROG -xc "quota -u $qa_user" $dir | \
> +		tail -n 1 | awk '{ print $2 }'`
> +	$XFS_QUOTA_PROG -xc "limit -u bhard=${blks}k $qa_user" $dir
> +	blks=`$XFS_QUOTA_PROG -xc "quota -g $qa_grup" $dir | \
> +		tail -n 1 | awk '{ print $2 }'`
> +	$XFS_QUOTA_PROG -xc "limit -g bhard=${blks}k $qa_group" $dir
> +
> +	# each quota has a single file worth of preallocation to reclaim. leave
> +	# some wiggle room and write to 1/3 the total.
> +	write_size=$((TOTAL_PREALLOC / 3))
> +	$XFS_IO_PROG -c "pwrite 0 $write_size" $dir/file | \
> +		_filter_xfs_io >> $seqres.full

no filter.

> +}
> +
> +# real QA test starts here
> +_supported_fs xfs
> +_supported_os Linux
> +
> +_require_scratch
> +_require_xfs_io_command "falloc"
> +_require_loop
> +_require_quota
> +_require_user
> +_require_group
> +
> +rm -f $seqres.full
> +
> +_scratch_mkfs_xfs | _filter_mkfs >> $seqres.full 2>&1
> +_scratch_mount
> +
> +# make sure the background eofblocks scanner doesn't interfere
> +orig_sp_time=`cat /proc/sys/fs/xfs/speculative_prealloc_lifetime`
> +echo 9999 > /proc/sys/fs/xfs/speculative_prealloc_lifetime
> +
> +LOOP_FILE=$SCRATCH_MNT/$seq.fs
> +LOOP_MNT=$SCRATCH_MNT/$seq.mnt
> +
> +$MKFS_XFS_PROG -d "file=1,name=$LOOP_FILE,size=$((1024*1024*1024 * 10))" | \
> +	_filter_mkfs >> $seqres.full 2>&1

mkfs takes "size=10g" as a valid size.

> +mkdir -p $LOOP_MNT
> +mount -t xfs -o loop,uquota,gquota $LOOP_FILE $LOOP_MNT || \
> +	_fail "Failed to mount loop fs."
> +
> +_test_enospc $LOOP_MNT
> +_test_edquot $LOOP_MNT
> +
> +umount $LOOP_MNT
> +
> +echo $orig_sp_time > /proc/sys/fs/xfs/speculative_prealloc_lifetime
> +
> +umount $SCRATCH_MNT
> +_check_scratch_fs
> +
> +status=0
> +exit
> diff --git a/tests/xfs/014.out b/tests/xfs/014.out
> new file mode 100644
> index 0000000..a825535
> --- /dev/null
> +++ b/tests/xfs/014.out
> @@ -0,0 +1 @@
> +QA output created by 014

The test writes nothing to the output file? Perhaps it should
indicate that (silence is golden....)....

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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Re: [PATCH v2] xfstests: test speculative preallocation reclaim on ENOSPC/EDQUOT

[Brian Foster]

On Tue, Jun 10, 2014 at 12:06:26PM +1000, Dave Chinner wrote:
> On Tue, Jun 03, 2014 at 10:53:58AM -0400, Brian Foster wrote:
> > XFS can allocate significant amounts of space to files via speculative
> > preallocation. Such preallocation may not be reclaimed automatically on
> > file close() if a file is repeatedly opened and extended. For smaller
> > filesystems with relatively large and slow growing files, this
> > preallocation can linger for some time, including contributing to out of
> > space conditions.
> > 
> > Create a situation where an fs is near out of space while several files
> > still have lingering, significant preallocations. Verify that new
> > writers reclaim the preallocated space rather than return ENOSPC. Repeat
> > a similar test for quota limits and EDQUOT.
> > 
> > Signed-off-by: Brian Foster <bfoster@redhat.com>
> 
> Couple of minor things.
> 
> > +# Create a file using a repeated open, extending write and close pattern. This
> > +# causes the preallocation to persist after the file is closed. Preallocation
> > +# will not be reclaimed unless the inode is evicted or we hit an allocation
> > +# failure.
> > +_spec_prealloc_file()
> > +{
> > +	file=$1
> > +
> > +	rm -f $file
> > +
> > +	# a few file extending open-write-close cycles should be enough to
> > +	# trigger the fs to retain preallocation. write 256k in 32k intervals to
> > +	# be sure
> > +	for i in $(seq 0 32768 262144)
> > +	do
> 
> 	for .... ; do
> 
> > +		$XFS_IO_PROG -fc "pwrite $i 32k" $file | \
> > +			_filter_xfs_io >> $seqres.full
> > +	done
> 
> If you are dumping the output into $seqres.full, then it doesn't
> need to be filtered. Filtering is only necessary for golden image
> matching; $seqres.full is for debug output and so should be
> pristine...
> 

Err... right. I think I was changing the output redirection around as I
was writing these tests and just lost track of the filtering. I'll fix
that.

> Also, I prefer $XFS_IO_PROG -f -c "..." (separate -c "...") because
> the -c arg must be followed by the command and so order is
> important...
> 

Ok.

> > +	# write a 4k aligned amount of data to keep the calculations simple
> > +	$XFS_IO_PROG -c "pwrite 0 128m" $file | _filter_xfs_io >> $seqres.full
> > +
> > +	size=`stat -c "%s" $file`
> > +	blocks=`stat -c "%b" $file`
> > +	blocksize=`stat -c "%B" $file`
> > +
> > +	prealloc_size=$((blocks * blocksize - size))
> > +	if [ $prealloc_size -eq 0 ]
> > +	then
> 
> 	if [ ... ]; then
> 
> > +		echo "Warning: No speculative preallocation for $file." \
> > +			"Check use of the allocsize= mount option."
> > +	fi
> > +
> > +	# keep a running total of how much preallocation we've created
> > +	TOTAL_PREALLOC=$((TOTAL_PREALLOC + prealloc_size))
> > +}
> > +
> > +_consume_free_space()
> > +{
> > +	dir=$1
> > +
> > +	# calculate the rough amount of free space in MB
> > +	fsblocksize=`$XFS_IO_PROG -x -c "statfs" $dir | grep f_bsize | \
> > +			awk '{ print $3 }'`
> > +	blocksavail=`$XFS_IO_PROG -x -c "statfs" $dir | grep f_bavail | \
> > +			awk '{ print $3 }'`
> > +	freesp=$((fsblocksize * blocksavail / 1024 / 1024))
> > +
> > +	# allocate all but 10MB
> > +	freesp=$((freesp - 10))
> 
> 	freesp=`$DF_PROG -m $dir | awk '/^\// { print $4 - 10 }'`
>  

Thanks. ;) The rest of the fixes look good to me so I'll get those in.
Thanks again for the review.

Brian

> > +	$XFS_IO_PROG -fc "falloc 0 ${freesp}M" $dir/spc
> > +}
> > +
> > +# Create several files with preallocation and consume the remaining free space
> > +# via fallocate to the put the fs at ENOSPC. Create a set of background writers
> > +# to write into ENOSPC and cause the preallocation to be reclaimed and
> > +# reallocated to the new writers.
> > +_test_enospc()
> > +{
> > +	dir=$1
> > +
> > +	rm -rf $dir/*
> > +
> > +	TOTAL_PREALLOC=0
> > +	for i in $(seq 0 3)
> > +	do
> 
> for (); do
> 
> > +		_spec_prealloc_file $dir/pre$i
> > +	done
> > +
> > +	_consume_free_space $dir
> > +
> > +	# consume 1/2 of the current preallocation across the set of 4 writers
> > +	write_size=$((TOTAL_PREALLOC / 2 / 4))
> > +	for i in $(seq 0 3)
> > +	do
> > +		$XFS_IO_PROG -fc "pwrite 0 $write_size" $dir/file.$i | \
> > +			_filter_xfs_io >> $seqres.full &
> 
> no filter, for (); do
> 
> > +	done
> > +
> > +	wait
> > +}
> > +
> > +# Create preallocations accounted by both user and group quotas. Set the
> > +# associated quota hard limits to put them at EDQUOT. Verify that a new writer
> > +# reclaims the preallocated space and proceeds without error.
> > +_test_edquot()
> > +{
> > +	dir=$1
> > +
> > +	rm -rf $dir/*
> > +
> > +	TOTAL_PREALLOC=0
> > +	_spec_prealloc_file $dir/user
> > +	chown $qa_user $dir/user
> > +
> > +	_spec_prealloc_file $dir/group
> > +	chgrp $qa_group $dir/group
> > +
> > +	# writing to a file under both quotas means both will be reclaimed on
> > +	# allocation failure
> > +	touch $dir/file
> > +	chown $qa_user $dir/file
> > +	chgrp $qa_group $dir/file
> > +
> > +	# put both quotas at EDQUOT
> > +	blks=`$XFS_QUOTA_PROG -xc "quota -u $qa_user" $dir | \
> > +		tail -n 1 | awk '{ print $2 }'`
> > +	$XFS_QUOTA_PROG -xc "limit -u bhard=${blks}k $qa_user" $dir
> > +	blks=`$XFS_QUOTA_PROG -xc "quota -g $qa_grup" $dir | \
> > +		tail -n 1 | awk '{ print $2 }'`
> > +	$XFS_QUOTA_PROG -xc "limit -g bhard=${blks}k $qa_group" $dir
> > +
> > +	# each quota has a single file worth of preallocation to reclaim. leave
> > +	# some wiggle room and write to 1/3 the total.
> > +	write_size=$((TOTAL_PREALLOC / 3))
> > +	$XFS_IO_PROG -c "pwrite 0 $write_size" $dir/file | \
> > +		_filter_xfs_io >> $seqres.full
> 
> no filter.
> 
> > +}
> > +
> > +# real QA test starts here
> > +_supported_fs xfs
> > +_supported_os Linux
> > +
> > +_require_scratch
> > +_require_xfs_io_command "falloc"
> > +_require_loop
> > +_require_quota
> > +_require_user
> > +_require_group
> > +
> > +rm -f $seqres.full
> > +
> > +_scratch_mkfs_xfs | _filter_mkfs >> $seqres.full 2>&1
> > +_scratch_mount
> > +
> > +# make sure the background eofblocks scanner doesn't interfere
> > +orig_sp_time=`cat /proc/sys/fs/xfs/speculative_prealloc_lifetime`
> > +echo 9999 > /proc/sys/fs/xfs/speculative_prealloc_lifetime
> > +
> > +LOOP_FILE=$SCRATCH_MNT/$seq.fs
> > +LOOP_MNT=$SCRATCH_MNT/$seq.mnt
> > +
> > +$MKFS_XFS_PROG -d "file=1,name=$LOOP_FILE,size=$((1024*1024*1024 * 10))" | \
> > +	_filter_mkfs >> $seqres.full 2>&1
> 
> mkfs takes "size=10g" as a valid size.
> 
> > +mkdir -p $LOOP_MNT
> > +mount -t xfs -o loop,uquota,gquota $LOOP_FILE $LOOP_MNT || \
> > +	_fail "Failed to mount loop fs."
> > +
> > +_test_enospc $LOOP_MNT
> > +_test_edquot $LOOP_MNT
> > +
> > +umount $LOOP_MNT
> > +
> > +echo $orig_sp_time > /proc/sys/fs/xfs/speculative_prealloc_lifetime
> > +
> > +umount $SCRATCH_MNT
> > +_check_scratch_fs
> > +
> > +status=0
> > +exit
> > diff --git a/tests/xfs/014.out b/tests/xfs/014.out
> > new file mode 100644
> > index 0000000..a825535
> > --- /dev/null
> > +++ b/tests/xfs/014.out
> > @@ -0,0 +1 @@
> > +QA output created by 014
> 
> The test writes nothing to the output file? Perhaps it should
> indicate that (silence is golden....)....
> 
> Cheers,
> 
> Dave.
> -- 
> Dave Chinner
> david@fromorbit.com

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