Re: [RFC][PATCH v2 0/5] Experiments with overlayfs filemap

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On Fri, Feb 01, 2019 at 05:24:26PM +0100, Miklos Szeredi wrote:
> On Fri, Feb 1, 2019 at 2:25 PM Amir Goldstein <amir73il@xxxxxxxxx> wrote:
> 
> > Wrong st_mtime/st_ctime:
> > generic/003 generic/080 generic/215
> 
> Fixed.  Albeit, I feel it's pretty hackish with various forms of
> ovl_copyattr sprinkled all over the place.  Need to think about proper
> management of attributes between upper and overlay inode.
> 
> >
> > EIO on clone/dedupe:
> > generic/303 generic/304
> >
> > Wrong st_blocks/fiemap:
> > generic/353 generic/392 generic/422
> 
> Hmm, generic/353 passes for me...
> 
> >
> > New lazy copy up semantics:
> > overlay/060
> 
> Need to fix the testcase?

This seems to fix xfstest overlay/060 for me.

Vivek

Subject: Fix metacopy test cases for data copy up on first read/write

Overlayfs might copy up data of file on first read/write of file (and
not necessarily upon open of file). So read few bytes from file opened
with O_RDWR and after that data must have been copied up.

Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
---
 tests/overlay/060 |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: xfstests-dev/tests/overlay/060
===================================================================
--- xfstests-dev.orig/tests/overlay/060	2018-08-27 11:21:51.811847671 -0400
+++ xfstests-dev/tests/overlay/060	2019-02-01 11:43:43.354762812 -0500
@@ -170,7 +170,7 @@ test_common()
 
 	# Trigger data copy up and check absence of metacopy xattr.
 	mount_overlay $_lowerdir
-	$XFS_IO_PROG -c "open -a $SCRATCH_MNT/$_target"
+	$XFS_IO_PROG -c "pread 0 1" $SCRATCH_MNT/$_target >> $seqres.full
 	echo "check properties of data copied up file"
 	check_file_size_contents $SCRATCH_MNT/$_target $_size "$_data"
 	umount_overlay



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