On Sun, May 26, 2024 at 12:47:49PM +0100, Filipe Manana wrote: > On Fri, May 24, 2024 at 9:58 PM Omar Sandoval <osandov@xxxxxxxxxxx> wrote: > > > > From: Omar Sandoval <osandov@xxxxxx> > > > > This is a regression test for a Btrfs bug, but there's nothing > > Btrfs-specific about it. Since it's a race, we just try to make the race > > happen in a loop and pass if it doesn't crash after all of our attempts. > > > > Signed-off-by: Omar Sandoval <osandov@xxxxxx> > > --- > > Changes from v1 [1]: > > > > - Added missing groups and requires. > > - Simplified $XFS_IO_PROG calls. > > - Removed -i flag from $XFS_IO_PROG to make race reproduce more > > reliably. > > - Removed all of the file creation and dump-tree parsing since the only > > file on a fresh filesystem is guaranteed to be at the end of a leaf > > anyways. > > - Rewrote to be a generic test. > > > > 1: https://lore.kernel.org/linux-btrfs/297da2b53ce9b697d82d89afd322b2cc0d0f392d.1716492850.git.osandov@xxxxxxxxxxx/ > > > > tests/generic/745 | 44 +++++++++++++++++++++++++++++++++++++++++++ > > tests/generic/745.out | 2 ++ > > 2 files changed, 46 insertions(+) > > create mode 100755 tests/generic/745 > > create mode 100644 tests/generic/745.out > > > > diff --git a/tests/generic/745 b/tests/generic/745 > > new file mode 100755 > > index 00000000..925adba9 > > --- /dev/null > > +++ b/tests/generic/745 > > Btw, generic/745 already exists in the for-next branch (development is > based against that branch nowadays). > > > @@ -0,0 +1,44 @@ > > +#! /bin/bash > > +# SPDX-License-Identifier: GPL-2.0 > > +# Copyright (c) Meta Platforms, Inc. and affiliates. > > +# > > +# FS QA Test 745 > > +# > > +# Repeatedly prealloc beyond i_size, set an xattr, direct write into the > > +# prealloc while extending i_size, then fdatasync. This is a regression test > > +# for a Btrfs crash. > > +# > > +. ./common/preamble > > +. ./common/attr > > +_begin_fstest auto quick log preallocrw dangerous > > + > > +_supported_fs generic > > +_require_scratch > > +_require_attrs > > +_require_xfs_io_command falloc -k > > Since this is now a generic test and we're using direct IO, also: > > _require_odirect > > > +_fixed_by_kernel_commit XXXXXXXXXXXX \ > > + "btrfs: fix crash on racing fsync and size-extending write into prealloc" > > Because it's now a generic test, it should be: > > [ "$FSTYP" = "btrfs" ] && _fixed_by_kernel_commit .... > > Otherwise it looks good to me, so with that: > > Reviewed-by: Filipe Manana <fdmanana@xxxxxxxx> Thanks Filipe, merged this patch with above review points, more details refer to "patches-in-queue" branch. Feel free to have more review points before I push to for-next :) Thanks, Zorro > > Thanks. > > > + > > +# -i slows down xfs_io startup and makes the race much less reliable. > > +export XFS_IO_PROG="$(echo "$XFS_IO_PROG" | sed 's/ -i\b//')" > > + > > +_scratch_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed" > > +_scratch_mount > > + > > +blksz=$(_get_block_size "$SCRATCH_MNT") > > + > > +# On Btrfs, since this is the only file on the filesystem, its metadata is at > > +# the end of a B-tree leaf. We want an ordered extent completion to add an > > +# extent item at the end of the leaf while we're logging prealloc extents > > +# beyond i_size after an xattr was set. > > +for ((i = 0; i < 5000; i++)); do > > + $XFS_IO_PROG -ftd -c "falloc -k 0 $((blksz * 3))" -c "pwrite -q -w 0 $blksz" "$SCRATCH_MNT/file" > > + $SETFATTR_PROG -n user.a -v a "$SCRATCH_MNT/file" > > + $XFS_IO_PROG -d -c "pwrite -q -w $blksz $blksz" "$SCRATCH_MNT/file" > > +done > > + > > +# If it didn't crash, we're good. > > + > > +echo "Silence is golden" > > +status=0 > > +exit > > diff --git a/tests/generic/745.out b/tests/generic/745.out > > new file mode 100644 > > index 00000000..fce6b7f5 > > --- /dev/null > > +++ b/tests/generic/745.out > > @@ -0,0 +1,2 @@ > > +QA output created by 745 > > +Silence is golden > > -- > > 2.45.1 > > > > >
