overlay: test ro/rw fd data inconsistecies

Commit Message

Eryu Guan Dec. 2, 2016, 5:42 a.m. UTC

On Thu, Dec 01, 2016 at 06:42:00PM +0200, Amir Goldstein wrote:
> On Tue, Nov 29, 2016 at 1:37 PM, Eryu Guan <[e-mail]> wrote:
> > On Tue, Nov 29, 2016 at 10:53:36AM +0200, Amir Goldstein wrote:
> 
> >>
> >> Eryu and all,
> >>
> >> I wanted to ask what is the common practice for introducing tests for
> >> know issues
> >> that are *about* to be solved.
> >>
> >> What is the preferred timing for merging these sort of tests?
> >> Is it productive to have these tests merged before a fix is merged to master?
> >> Before a fix is queued for next?
> >> Before a fix is available?
> >
> > Basically new regression tests will be merged as soon as possible, as
> > long as there're no objections from reviewers or all comments are
> > addressed.
> >
> > One exception is that for tests that could crash latest maintainer's
> > tree (even there's a known fix), I'd perfer letting the fix go upstream
> > first, so that the test doesn't break anyone's tests by crashing all the
> > testing hosts. It's great if the test author could give a notification
> > on the test to say that the fix has been merged, so the test could be
> > merged too. I'll watch the patch status too, but maybe not so timely.
> >
> 
> Nothing of a sort lurking with the tests I am planning to write.
> Just tests that check for "Non-standard behavior" of overlayfs,
> some of it described in Documentation/filesystems/overlayfs.txt.
> 
> >
> >>
> >> FYI, the fix for the test in this patch (test ro/rw fd data inconsistencies)
> >> is not queued for next yet, but I am hoping it will be.
> >> Miklos?
> >
> > FYI, this test is already in my last pull request to Dave.
> >
> 
> Eryu,
> 
> I am getting this error when running my test with an older xfs_io (4.3.0).
> I generated the good output with xfs_io from Dave's for-next branch (4.8.0).
> 
> Have you any idea why in one setup I see the commands echoed
> to output and not in the other?

I'm also using latest for-next branch, so I didn't notice this issue
either. I guess xfs_io changed its behavior on when to print \n in
interactive mode, but I didn't dig into the history.

> 
> I realize that the use of redirecting commands from here document
> to xfs_io has not been used in xfstests before, but I could not find
> another way to use 'open' commands, which are needed for this test.
> 
> Amir.
> 
> overlay/016      - output mismatch (see
> /home/amir/src/xfstests-dev/results//overlay/016.out.bad)
>     --- tests/overlay/016.out   2016-12-01 12:19:02.710370574 +0200
>     +++ /home/amir/src/xfstests-dev/results//overlay/016.out.bad
>  2016-12-01 18:29:23.684327009 +0200
>     @@ -1,12 +1,22 @@
>      QA output created by 016
>     -xfs_io> xfs_io> xfs_io> wrote 16/16 bytes at offset 0
>     +xfs_io> open -r foo
>     +xfs_io> open foo
>     +xfs_io> pwrite -S 0x61 0 16
>     +wrote 16/16 bytes at offset 0
>      XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
>     ...

I did find a better way to call open either, but if all we care about is
the output from reading the file, then we can check that explicitly and
ignore other outputs. e.g. 


This should work for both old and new version of xfs_io.

Thanks,
Eryu
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Patch

--- a/tests/overlay/016
+++ b/tests/overlay/016
@@ -61,6 +61,8 @@  mkdir -p $lowerdir
 echo "This is old news" > $lowerdir/foo
 echo "This is old news" > $lowerdir/bar
 
+echo "Silence is golden"
+
 _scratch_mount
 
 cd $SCRATCH_MNT
@@ -72,7 +74,7 @@  cd $SCRATCH_MNT
 # write to rwfd
 # read from rofd
 #
-$XFS_IO_PROG << EOF | _filter_xfs_io
+$XFS_IO_PROG << EOF | grep "old"
 open -r foo
 open foo
 pwrite -S 0x61 0 16
@@ -86,7 +88,7 @@  EOF
 # write to rwfd
 # read from mapped memory
 #
-$XFS_IO_PROG << EOF | _filter_xfs_io
+$XFS_IO_PROG << EOF | grep "old"
 open -r bar
 mmap -r 0 16
 open bar
diff --git a/tests/overlay/016.out b/tests/overlay/016.out
index 52b8cd7..aa2526b 100644
--- a/tests/overlay/016.out
+++ b/tests/overlay/016.out
@@ -1,12 +1,2 @@ 
 QA output created by 016
-xfs_io> xfs_io> xfs_io> wrote 16/16 bytes at offset 0
-XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-xfs_io> [000] foo            (foreign,non-sync,non-direct,read-only)
- 001  foo            (foreign,non-sync,non-direct,read-write)
-xfs_io> 00000000:  61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61  aaaaaaaaaaaaaaaa
-read 16/16 bytes at offset 0
-XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-xfs_io> xfs_io> xfs_io> xfs_io> xfs_io> wrote 16/16 bytes at offset 0
-XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-xfs_io> 00000000:  61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61  aaaaaaaaaaaaaaaa
-xfs_io> 
\ No newline at end of file
+Silence is golden