On Sat, Nov 05, 2022 at 08:16:11PM +0800, Zorro Lang wrote: > On Fri, Nov 04, 2022 at 09:29:28AM -0700, Darrick J. Wong wrote: > > On Sat, Nov 05, 2022 at 12:20:02AM +0800, Zorro Lang wrote: > > > An old issue might cause on-disk inode sizes are logged prematurely > > > via the free eofblocks path on file close. Then fs shutdown might > > > leave NULL files but their di_size > 0. > > > > > > Signed-off-by: Zorro Lang <zlang@xxxxxxxxxx> > > > --- > > > > > > Hi, > > > > > > There was an very old xfs bug on rhel-6.5, I'd like to share its reproducer to > > > fstests. I've tried generic/044~049, no one can reproduce this bug, so I > > > have to write this new one. It fails on rhel-6.5 [1], and test passed on > > > later kernel. > > > > > > I hard to say which patch fix this issue exactly, it's fixed by a patchset > > > which does code improvement/cleanup. > > > > > > Thanks, > > > Zorro > > > > > > [1] > > > # ./check generic/999 > > > FSTYP -- xfs (non-debug) > > > PLATFORM -- Linux/x86_64 > > > MKFS_OPTIONS -- -f -bsize=4096 /dev/loop1 > > > MOUNT_OPTIONS -- -o context=system_u:object_r:nfs_t:s0 /dev/loop1 /mnt/scratch > > > > > > generic/999 2s ... - output mismatch (see /root/xfstests-dev/results//generic/999.out.bad) > > > --- tests/generic/999.out 2022-11-04 00:54:11.123353054 -0400 > > > +++ /root/xfstests-dev/results//generic/999.out.bad 2022-11-04 04:24:57.861673433 -0400 > > > @@ -1 +1,3 @@ > > > QA output created by 999 > > > + - /mnt/scratch/1 get no extents, but its di_size > 0 > > > +/mnt/scratch/1: > > > ... > > > (Run 'diff -u tests/generic/045.out /root/xfstests-dev/results//generic/999.out.bad' to see the entire diff) > > > Ran: generic/999 > > > Failures: generic/999 > > > Failed 1 of 1 tests > > > > > > tests/generic/999 | 46 +++++++++++++++++++++++++++++++++++++++++++ > > > tests/generic/999.out | 5 +++++ > > > 2 files changed, 51 insertions(+) > > > create mode 100755 tests/generic/999 > > > create mode 100644 tests/generic/999.out > > > > > > diff --git a/tests/generic/999 b/tests/generic/999 > > > new file mode 100755 > > > index 00000000..a2e662fc > > > --- /dev/null > > > +++ b/tests/generic/999 > > > @@ -0,0 +1,46 @@ > > > +#! /bin/bash > > > +# SPDX-License-Identifier: GPL-2.0 > > > +# Copyright (c) 2022 Red Hat, Inc. All Rights Reserved. > > > +# > > > +# FS QA Test No. 999 > > > +# > > > +# Test an issue in the truncate codepath where on-disk inode sizes are logged > > > +# prematurely via the free eofblocks path on file close. > > > +# > > > +. ./common/preamble > > > +_begin_fstest auto quick shutdown > > > + > > > +# real QA test starts here > > > +_supported_fs xfs > > > +_require_scratch > > > +_require_xfs_io_command fiemap > > > > /me would've thought you'd use the xfs_io stat/bmap commands to detect > > either nextents > 0 (stat) or actual mappings returned (bmap), but I Wait a minute... the "stat" command can help this case too? I didn't use bmap command due to it only for xfs, but stat is a common command, if it helps, that's better than fiemap (due to it supports old system). I'll give it a test, and will resend the patch if it works. Thanks your suggestion! > > guess if RHEL 6.5 xfsprogs has a fiemap command then this is fine with > > me. > > Ah, you're right, rhel-6 xfs_io doesn't support fiemap :) > > And yes, I wrote this case as a xfs specific case at first, by using xfs_bmap. > The original case (of us) uses xfs_bmap too. But I thought fiemap can help it > to be a generic case to cover more fs, so I turn to use fiemap. > > > > > If the answer to the above is "um, RHEL 6.5 xfsprogs *does* have FIEMAP", > > then there's little point in rewriting a stable regression test, so: > > I don't worry about rhel6 testing, due to I keep our internal case (for rhel6 > only). I'd like to see more generic cases, except fiemap can't help this test :) > > Thanks, > Zorro > > > > > Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx> > > > > --D > > > > > +_require_scratch_shutdown > > > +_scratch_mkfs > $seqres.full 2>&1 > > > +_scratch_mount > > > + > > > +echo "Create many small files with one extent at least" > > > +for ((i=0; i<10000; i++));do > > > + $XFS_IO_PROG -f -c "pwrite 0 4k" $SCRATCH_MNT/file.$i >/dev/null 2>&1 > > > +done > > > + > > > +echo "Shutdown the fs suddently" > > > +_scratch_shutdown > > > + > > > +echo "Cycle mount" > > > +_scratch_cycle_mount > > > + > > > +echo "Check file's (di_size > 0) extents" > > > +for f in $(find $SCRATCH_MNT -type f -size +0);do > > > + $XFS_IO_PROG -c "fiemap" $f > $tmp.fiemap > > > + # Check if the file has any extent > > > + grep -Eq '^[[:space:]]+[0-9]+:' $tmp.fiemap > > > + if [ $? -ne 0 ];then > > > + echo " - $f get no extents, but its di_size > 0" > > > + cat $tmp.fiemap > > > + break > > > + fi > > > +done > > > + > > > +# success, all done > > > +status=0 > > > +exit > > > diff --git a/tests/generic/999.out b/tests/generic/999.out > > > new file mode 100644 > > > index 00000000..50008783 > > > --- /dev/null > > > +++ b/tests/generic/999.out > > > @@ -0,0 +1,5 @@ > > > +QA output created by 999 > > > +Create many small files with one extent at least > > > +Shutdown the fs suddently > > > +Cycle mount > > > +Check file's (di_size > 0) extents > > > -- > > > 2.31.1 > > > > >
