On Mon, Jul 05, 2021 at 07:04:34PM +0800, Zorro Lang wrote: > On Fri, Jul 02, 2021 at 09:40:24AM -0400, Jeff Layton wrote: > > We had a broken optimization in cephfs and netfs lib that could cause > > part of a page to be improperly zeroed-out when writing to an offset > > that was beyond the EOF but in an existing page. > > > > Add a simple test that would have caught this. > > > > Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx> > > --- > > tests/generic/639 | 39 +++++++++++++++++++++++++++++++++++++++ > > tests/generic/639.out | 5 +++++ > > 2 files changed, 44 insertions(+) > > create mode 100755 tests/generic/639 > > create mode 100644 tests/generic/639.out > > > > v3: adapt to new test template > > > > diff --git a/tests/generic/639 b/tests/generic/639 > > new file mode 100755 > > index 000000000000..c30f7644a2fc > > --- /dev/null > > +++ b/tests/generic/639 > > @@ -0,0 +1,39 @@ > > +#! /bin/bash > > +# SPDX-License-Identifier: GPL-2.0 > > +# Copyright (c) 2021, Jeff Layton <jlayton@xxxxxxxxxx> > > +# > > +# FS QA Test No. 639 > > +# > > +# Open a file and write a little data to it. Unmount (to clean out the cache) > > +# and then mount again. Then write some data to it beyond the EOF and ensure > > +# the result is correct. > > +# > > +# Prompted by a bug in ceph_write_begin that was fixed by commit 827a746f405d. > > +# > > +. ./common/preamble > > +_begin_fstest auto quick rw > > + > > +# Import common functions. > > +. ./common/filter > > + > > +# real QA test starts here > > +_supported_fs generic > > +_require_test > > + > > +testfile="$TEST_DIR/test_write_begin.$$" > > + > > +# write some data to file and fsync it out > > +$XFS_IO_PROG -f -c "pwrite -q 0 32" $testfile > > Looks good to me, if you've used this case to reproduce that issue. > > Just one question, the comment says "fsync it out", does that mean we need an > explicit "fsync" call (e.g. -c "pwrite -q 0 32" -c "fsync") to reproduce this > bug? Or there's an implicit "fsync" somewhere? Oh, this patch has just been merged, sorry for my late review. You can ignore this message. Thanks, Zorro > > Thanks, > Zorro > > > + > > +# cycle the mount to clean out the pagecache > > +_test_cycle_mount > > + > > +# now, write to the file (near the end) > > +$XFS_IO_PROG -c "pwrite -q 32 32" $testfile > > + > > +# dump what we think is in there > > +echo "The result should be 64 bytes filled with 0xcd:" > > +hexdump -C $testfile > > + > > +status=0 > > +exit > > diff --git a/tests/generic/639.out b/tests/generic/639.out > > new file mode 100644 > > index 000000000000..9bf0bac96864 > > --- /dev/null > > +++ b/tests/generic/639.out > > @@ -0,0 +1,5 @@ > > +QA output created by 639 > > +The result should be 64 bytes filled with 0xcd: > > +00000000 cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd cd |................| > > +* > > +00000040 > > -- > > 2.31.1 > >
