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Message-ID: <20250206155251.GA21787@frogsfrogsfrogs>
Date: Thu, 6 Feb 2025 07:52:51 -0800
From: "Darrick J. Wong" <djwong@...nel.org>
To: "Nirjhar Roy (IBM)" <nirjhar.roy.lists@...il.com>
Cc: fstests@...r.kernel.org, linux-ext4@...r.kernel.org,
linux-xfs@...r.kernel.org, ritesh.list@...il.com,
ojaswin@...ux.ibm.com, zlang@...nel.org
Subject: Re: [PATCH v2] check: Fix fs specfic imports when
$FSTYPE!=$OLD_FSTYPE
On Thu, Feb 06, 2025 at 11:05:42AM +0530, Nirjhar Roy (IBM) wrote:
>
> On 1/31/25 21:54, Darrick J. Wong wrote:
> > On Fri, Jan 31, 2025 at 06:49:50PM +0530, Nirjhar Roy (IBM) wrote:
> > > On 1/29/25 21:32, Darrick J. Wong wrote:
> > > > On Wed, Jan 29, 2025 at 04:48:10PM +0530, Nirjhar Roy (IBM) wrote:
> > > > > On 1/28/25 23:39, Darrick J. Wong wrote:
> > > > > > On Tue, Jan 28, 2025 at 05:00:22AM +0000, Nirjhar Roy (IBM) wrote:
> > > > > > > Bug Description:
> > > > > > >
> > > > > > > _test_mount function is failing with the following error:
> > > > > > > ./common/rc: line 4716: _xfs_prepare_for_eio_shutdown: command not found
> > > > > > > check: failed to mount /dev/loop0 on /mnt1/test
> > > > > > >
> > > > > > > when the second section in local.config file is xfs and the first section
> > > > > > > is non-xfs.
> > > > > > >
> > > > > > > It can be easily reproduced with the following local.config file
> > > > > > >
> > > > > > > [s2]
> > > > > > > export FSTYP=ext4
> > > > > > > export TEST_DEV=/dev/loop0
> > > > > > > export TEST_DIR=/mnt1/test
> > > > > > > export SCRATCH_DEV=/dev/loop1
> > > > > > > export SCRATCH_MNT=/mnt1/scratch
> > > > > > >
> > > > > > > [s1]
> > > > > > > export FSTYP=xfs
> > > > > > > export TEST_DEV=/dev/loop0
> > > > > > > export TEST_DIR=/mnt1/test
> > > > > > > export SCRATCH_DEV=/dev/loop1
> > > > > > > export SCRATCH_MNT=/mnt1/scratch
> > > > > > >
> > > > > > > ./check selftest/001
> > > > > > >
> > > > > > > Root cause:
> > > > > > > When _test_mount() is executed for the second section, the FSTYPE has
> > > > > > > already changed but the new fs specific common/$FSTYP has not yet
> > > > > > > been done. Hence _xfs_prepare_for_eio_shutdown() is not found and
> > > > > > > the test run fails.
> > > > > > >
> > > > > > > Fix:
> > > > > > > Remove the additional _test_mount in check file just before ". commom/rc"
> > > > > > > since ". commom/rc" is already sourcing fs specific imports and doing a
> > > > > > > _test_mount.
> > > > > > >
> > > > > > > Fixes: 1a49022fab9b4 ("fstests: always use fail-at-unmount semantics for XFS")
> > > > > > > Signed-off-by: Nirjhar Roy (IBM) <nirjhar.roy.lists@...il.com>
> > > > > > > ---
> > > > > > > check | 12 +++---------
> > > > > > > 1 file changed, 3 insertions(+), 9 deletions(-)
> > > > > > >
> > > > > > > diff --git a/check b/check
> > > > > > > index 607d2456..5cb4e7eb 100755
> > > > > > > --- a/check
> > > > > > > +++ b/check
> > > > > > > @@ -784,15 +784,9 @@ function run_section()
> > > > > > > status=1
> > > > > > > exit
> > > > > > > fi
> > > > > > > - if ! _test_mount
> > > > > > Don't we want to _test_mount the newly created filesystem still? But
> > > > > > perhaps after sourcing common/rc ?
> > > > > >
> > > > > > --D
> > > > > common/rc calls init_rc() in the end and init_rc() already does a
> > > > > _test_mount. _test_mount after sourcing common/rc will fail, won't it? Does
> > > > > that make sense?
> > > > >
> > > > > init_rc()
> > > > > {
> > > > > # make some further configuration checks here
> > > > > if [ "$TEST_DEV" = "" ]
> > > > > then
> > > > > echo "common/rc: Error: \$TEST_DEV is not set"
> > > > > exit 1
> > > > > fi
> > > > >
> > > > > # if $TEST_DEV is not mounted, mount it now as XFS
> > > > > if [ -z "`_fs_type $TEST_DEV`" ]
> > > > > then
> > > > > # $TEST_DEV is not mounted
> > > > > if ! _test_mount
> > > > > then
> > > > > echo "common/rc: retrying test device mount with external set"
> > > > > [ "$USE_EXTERNAL" != "yes" ] && export USE_EXTERNAL=yes
> > > > > if ! _test_mount
> > > > > then
> > > > > echo "common/rc: could not mount $TEST_DEV on $TEST_DIR"
> > > > > exit 1
> > > > > fi
> > > > > fi
> > > > > fi
> > > > > ...
> > > > ahahahaha yes it does.
> > > >
> > > > /commit message reading comprehension fail, sorry about that.
> > > >
> > > > Though now that you point it out, should check elide the init_rc call
> > > > about 12 lines down if it re-sourced common/rc ?
> > > Yes, it should. init_rc() is getting called twice when common/rc is getting
> > > re-sourced. Maybe I can do like
> > >
> > >
> > > if $RECREATE_TEST_DEV || [ "$OLD_FSTYP" != "$FSTYP" ]; then
> > >
> > > <...>
> > >
> > > . common/rc # changes in this patch
> > >
> > > <...>
> > >
> > > elif [ "$OLD_TEST_FS_MOUNT_OPTS" != "$TEST_FS_MOUNT_OPTS" ]; then
> > >
> > > ...
> > >
> > > init_rc() # explicitly adding an init_rc() for this condition
> > >
> > > else
> > >
> > > init_rc() # # explicitly adding an init_rc() for all other conditions.
> > > This will prevent init_rc() from getting called twice during re-sourcing
> > > common/rc
> > >
> > > fi
> > >
> > > What do you think?
> > Sounds fine as a mechanical change, but I wonder, should calling init_rc
> > be explicit? There are not so many places that source common/rc:
> >
> > $ git grep 'common/rc'
> > check:362:if ! . ./common/rc; then
> > check:836: . common/rc
> > common/preamble:52: . ./common/rc
> > soak:7:. ./common/rc
> > tests/generic/749:18:. ./common/rc
> >
> > (I filtered out the non-executable matches)
> >
> > I think the call in generic/749 is unnecessary and I don't know what
> > soak does. But that means that one could insert an explicit call to
> > init_rc at line 366 and 837 in check and at line 53 in common/preamble,
> > and we can clean up one more of those places where sourcing a common/
> > file actually /does/ something quietly under the covers.
>
> Okay just to clear my understanding, do you mean that the call to init_rc()
> be removed from common/rc file and the places which actually need the call
> to init_rc, explicitly calls init_rc() instead of sourcing ". common/rc" and
> making common/rc do something under the cover?
Yes. Callsites like this:
. ./common
<horrid bash code>
become this:
. ./common/rc
init_rc
<horrid bash code>
--D
> --NR
>
> >
> > (Unless the maintainer is ok with the status quo...?)
> >
> > --D
> >
> > > > Reviewed-by: "Darrick J. Wong" <djwong@...nel.org>
> > > >
> > > > --D
> > > >
> > > > > ...
> > > > >
> > > > > --NR
> > > > >
> > > > >
> > > > >
> > > > > > > - then
> > > > > > > - echo "check: failed to mount $TEST_DEV on $TEST_DIR"
> > > > > > > - status=1
> > > > > > > - exit
> > > > > > > - fi
> > > > > > > - # TEST_DEV has been recreated, previous FSTYP derived from
> > > > > > > - # TEST_DEV could be changed, source common/rc again with
> > > > > > > - # correct FSTYP to get FSTYP specific configs, e.g. common/xfs
> > > > > > > + # Previous FSTYP derived from TEST_DEV could be changed, source
> > > > > > > + # common/rc again with correct FSTYP to get FSTYP specific configs,
> > > > > > > + # e.g. common/xfs
> > > > > > > . common/rc
> > > > > > > _prepare_test_list
> > > > > > > elif [ "$OLD_TEST_FS_MOUNT_OPTS" != "$TEST_FS_MOUNT_OPTS" ]; then
> > > > > > > --
> > > > > > > 2.34.1
> > > > > > >
> > > > > > >
> > > > > --
> > > > > Nirjhar Roy
> > > > > Linux Kernel Developer
> > > > > IBM, Bangalore
> > > > >
> > > --
> > > Nirjhar Roy
> > > Linux Kernel Developer
> > > IBM, Bangalore
> > >
> > >
> --
> Nirjhar Roy
> Linux Kernel Developer
> IBM, Bangalore
>
>
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