* [PATCH v3] overlay: test unstable inode number
@ 2016-12-12 8:45 Amir Goldstein
2016-12-12 9:08 ` Eryu Guan
0 siblings, 1 reply; 5+ messages in thread
From: Amir Goldstein @ 2016-12-12 8:45 UTC (permalink / raw)
To: Eryu Guan; +Cc: Miklos Szeredi, linux-unionfs, fstests
Introduce a new test to demonstrate a known issue with overlayfs:
- stat file A shows inode number X
- modify A to trigger copy up
- stat file A shows inode number Y != X
Also test if d_ino of readdir entries changes after copy up.
There is a POC patch by Miklos Szeredi that fixes this issue.
Not dealing with hardlinks here, because there is more to test
then stable inode number.
Hardlinks will get a test of their own.
---
tests/overlay/018 | 101 ++++++++++++++++++++++++++++++++++++++++++++++++++
tests/overlay/018.out | 7 ++++
tests/overlay/group | 1 +
3 files changed, 109 insertions(+)
create mode 100755 tests/overlay/018
create mode 100644 tests/overlay/018.out
v3:
- test also special device files
- document not testing hardlinks
v2:
- use arbitrary uid for chown
diff --git a/tests/overlay/018 b/tests/overlay/018
new file mode 100755
index 0000000..230245b
--- /dev/null
+++ b/tests/overlay/018
@@ -0,0 +1,101 @@
+#! /bin/bash
+# FSQA Test No. 018
+#
+# Test unstable inode number
+#
+# This simple test demonstrates a known issue with overlayfs:
+# - stat file A shows inode number X
+# - modify A to trigger copy up
+# - stat file A shows inode number Y != X
+#
+# Also test if d_ino of readdir entries changes after copy up.
+#
+#-----------------------------------------------------------------------
+#
+# Copyright (C) 2016 CTERA Networks. All Rights Reserved.
+# Author: Amir Goldstein <amir73il@gmail.com>
+#
+# 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"
+
+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
+
+# real QA test starts here
+_supported_fs overlay
+_supported_os Linux
+_require_scratch
+
+rm -f $seqres.full
+
+_scratch_mkfs >>$seqres.full 2>&1
+
+# Create our test files.
+# Not dealing with hardlinks here, because there is more to test
+# then stable inode number.
+# Hardlinks will get a test of their own.
+lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+mkdir -p $lowerdir
+mkdir $lowerdir/dir
+touch $lowerdir/file
+ln -s $lowerdir/file $lowerdir/symlink
+mknod $lowerdir/chrdev c 1 1
+mknod $lowerdir/blkdev b 1 1
+mknod $lowerdir/fifo p
+
+
+_scratch_mount
+
+cd $SCRATCH_MNT
+
+rm -f $tmp.before $tmp.after
+
+# Test stable stat(2) st_ino
+
+# Record inode numbers before and after copy up
+for f in dir file symlink chrdev blkdev fifo; do
+ ls -id $f >> $tmp.before
+ # chown -h modifies all those file types
+ chown -h 100 $f
+ ls -id $f >> $tmp.after
+done
+
+# Test stable readdir(3)/getdents(2) d_ino
+
+# find by inode number - expect to find file by inode number
+cat $tmp.before | while read ino f; do
+ find $f -inum $ino -maxdepth 0
+done
+
+# Compare before..after - expect silence
+diff $tmp.before $tmp.after
+
+status=0
+exit
diff --git a/tests/overlay/018.out b/tests/overlay/018.out
new file mode 100644
index 0000000..bf4bce8
--- /dev/null
+++ b/tests/overlay/018.out
@@ -0,0 +1,7 @@
+QA output created by 018
+dir
+file
+symlink
+chrdev
+blkdev
+fifo
diff --git a/tests/overlay/group b/tests/overlay/group
index 5740d2a..683b2fc 100644
--- a/tests/overlay/group
+++ b/tests/overlay/group
@@ -19,3 +19,4 @@
014 auto quick copyup
015 auto quick whiteout
016 auto quick
+018 auto quick
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v3] overlay: test unstable inode number
2016-12-12 8:45 [PATCH v3] overlay: test unstable inode number Amir Goldstein
@ 2016-12-12 9:08 ` Eryu Guan
2016-12-12 9:21 ` Amir Goldstein
0 siblings, 1 reply; 5+ messages in thread
From: Eryu Guan @ 2016-12-12 9:08 UTC (permalink / raw)
To: Amir Goldstein; +Cc: Miklos Szeredi, linux-unionfs, fstests
On Mon, Dec 12, 2016 at 10:45:06AM +0200, Amir Goldstein wrote:
> Introduce a new test to demonstrate a known issue with overlayfs:
> - stat file A shows inode number X
> - modify A to trigger copy up
> - stat file A shows inode number Y != X
>
> Also test if d_ino of readdir entries changes after copy up.
>
> There is a POC patch by Miklos Szeredi that fixes this issue.
>
> Not dealing with hardlinks here, because there is more to test
> then stable inode number.
> Hardlinks will get a test of their own.
Thanks! I added the missing SOB line, and added "copyup" group too.
Eryu
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v3] overlay: test unstable inode number
2016-12-12 9:08 ` Eryu Guan
@ 2016-12-12 9:21 ` Amir Goldstein
2016-12-12 9:26 ` Eryu Guan
0 siblings, 1 reply; 5+ messages in thread
From: Amir Goldstein @ 2016-12-12 9:21 UTC (permalink / raw)
To: Eryu Guan; +Cc: Miklos Szeredi, linux-unionfs, fstests
On Mon, Dec 12, 2016 at 11:08 AM, Eryu Guan <eguan@redhat.com> wrote:
> On Mon, Dec 12, 2016 at 10:45:06AM +0200, Amir Goldstein wrote:
>> Introduce a new test to demonstrate a known issue with overlayfs:
>> - stat file A shows inode number X
>> - modify A to trigger copy up
>> - stat file A shows inode number Y != X
>>
>> Also test if d_ino of readdir entries changes after copy up.
>>
>> There is a POC patch by Miklos Szeredi that fixes this issue.
>>
>> Not dealing with hardlinks here, because there is more to test
>> then stable inode number.
>> Hardlinks will get a test of their own.
>
> Thanks! I added the missing SOB line, and added "copyup" group too.
>
Right. Thanks.
I audited existing tests and I believe my 016 also calls for "copyup" tag
and 013 as well.
Do you want a patch for that or will you fix it up yourself?
Amir.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v3] overlay: test unstable inode number
2016-12-12 9:21 ` Amir Goldstein
@ 2016-12-12 9:26 ` Eryu Guan
0 siblings, 0 replies; 5+ messages in thread
From: Eryu Guan @ 2016-12-12 9:26 UTC (permalink / raw)
To: Amir Goldstein; +Cc: Miklos Szeredi, linux-unionfs, fstests
On Mon, Dec 12, 2016 at 11:21:48AM +0200, Amir Goldstein wrote:
> On Mon, Dec 12, 2016 at 11:08 AM, Eryu Guan <eguan@redhat.com> wrote:
> > On Mon, Dec 12, 2016 at 10:45:06AM +0200, Amir Goldstein wrote:
> >> Introduce a new test to demonstrate a known issue with overlayfs:
> >> - stat file A shows inode number X
> >> - modify A to trigger copy up
> >> - stat file A shows inode number Y != X
> >>
> >> Also test if d_ino of readdir entries changes after copy up.
> >>
> >> There is a POC patch by Miklos Szeredi that fixes this issue.
> >>
> >> Not dealing with hardlinks here, because there is more to test
> >> then stable inode number.
> >> Hardlinks will get a test of their own.
> >
> > Thanks! I added the missing SOB line, and added "copyup" group too.
> >
>
> Right. Thanks.
> I audited existing tests and I believe my 016 also calls for "copyup" tag
> and 013 as well.
> Do you want a patch for that or will you fix it up yourself?
Please send a new patch to fix them. Thanks!
Eryu
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v3] overlay: test unstable inode number
@ 2016-12-13 6:18 Amir Goldstein
0 siblings, 0 replies; 5+ messages in thread
From: Amir Goldstein @ 2016-12-13 6:18 UTC (permalink / raw)
To: Eryu Guan; +Cc: Miklos Szeredi, linux-unionfs, fstests
Introduce a new test to demonstrate a known issue with overlayfs:
- stat file A shows inode number X
- modify A to trigger copy up
- stat file A shows inode number Y != X
Also test if d_ino of readdir entries changes after copy up.
There is a POC patch by Miklos Szeredi that fixes this issue.
Not dealing with hardlinks here, because there is more to test
then stable inode number.
Hardlinks will get a test of their own.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
tests/overlay/018 | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++
tests/overlay/018.out | 7 ++++
tests/overlay/group | 1 +
3 files changed, 107 insertions(+)
create mode 100755 tests/overlay/018
create mode 100644 tests/overlay/018.out
v3:
- avoid cd into $SCRATCH_MNT
v2:
- use arbitrary uid for chown
diff --git a/tests/overlay/018 b/tests/overlay/018
new file mode 100755
index 0000000..92fb63d
--- /dev/null
+++ b/tests/overlay/018
@@ -0,0 +1,99 @@
+#! /bin/bash
+# FSQA Test No. 018
+#
+# Test unstable inode number
+#
+# This simple test demonstrates a known issue with overlayfs:
+# - stat file A shows inode number X
+# - modify A to trigger copy up
+# - stat file A shows inode number Y != X
+#
+# Also test if d_ino of readdir entries changes after copy up.
+#
+#-----------------------------------------------------------------------
+#
+# Copyright (C) 2016 CTERA Networks. All Rights Reserved.
+# Author: Amir Goldstein <amir73il@gmail.com>
+#
+# 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"
+
+tmp=/tmp/$$
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+ rm -f $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_fs overlay
+_supported_os Linux
+_require_scratch
+
+rm -f $seqres.full
+
+_scratch_mkfs >>$seqres.full 2>&1
+
+# Create our test files.
+# Not dealing with hardlinks here, because there is more to test
+# then stable inode number.
+# Hardlinks will get a test of their own.
+lowerdir=$SCRATCH_DEV/$OVERLAY_LOWER_DIR
+mkdir -p $lowerdir
+mkdir $lowerdir/dir
+touch $lowerdir/file
+ln -s $lowerdir/file $lowerdir/symlink
+mknod $lowerdir/chrdev c 1 1
+mknod $lowerdir/blkdev b 1 1
+mknod $lowerdir/fifo p
+
+
+_scratch_mount
+
+
+rm -f $tmp.before $tmp.after
+
+# Test stable stat(2) st_ino
+
+# Record inode numbers before and after copy up
+for f in dir file symlink chrdev blkdev fifo; do
+ ls -id $SCRATCH_MNT/$f >> $tmp.before
+ # chown -h modifies all those file types
+ chown -h 100 $SCRATCH_MNT/$f
+ ls -id $SCRATCH_MNT/$f >> $tmp.after
+done
+
+# Test stable readdir(3)/getdents(2) d_ino
+
+# find by inode number - expect to find file by inode number
+cat $tmp.before | while read ino f; do
+ find $f -inum $ino -maxdepth 0 | _filter_scratch
+done
+
+# Compare before..after - expect silence
+diff $tmp.before $tmp.after
+
+status=0
+exit
diff --git a/tests/overlay/018.out b/tests/overlay/018.out
new file mode 100644
index 0000000..0e5132c
--- /dev/null
+++ b/tests/overlay/018.out
@@ -0,0 +1,7 @@
+QA output created by 018
+SCRATCH_MNT/dir
+SCRATCH_MNT/file
+SCRATCH_MNT/symlink
+SCRATCH_MNT/chrdev
+SCRATCH_MNT/blkdev
+SCRATCH_MNT/fifo
diff --git a/tests/overlay/group b/tests/overlay/group
index 7cb2615..fb6610d 100644
--- a/tests/overlay/group
+++ b/tests/overlay/group
@@ -19,3 +19,4 @@
014 auto quick copyup
015 auto quick whiteout
016 auto quick copyup
+018 auto quick copyup
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2016-12-13 6:18 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-12-12 8:45 [PATCH v3] overlay: test unstable inode number Amir Goldstein
2016-12-12 9:08 ` Eryu Guan
2016-12-12 9:21 ` Amir Goldstein
2016-12-12 9:26 ` Eryu Guan
2016-12-13 6:18 Amir Goldstein
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