| Message ID | 20240611030203.1719072-2-mcgrof@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | fstests: add some new LBS inspired tests | expand |
On Mon, Jun 10, 2024 at 08:01:58PM -0700, Luis Chamberlain wrote: > We want a shared way to use mmap in a way that we can test > for the SIGBUS, provide a shared routine which other tests can > leverage. > > Suggested-by: "Darrick J. Wong" <djwong@kernel.org> > Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Looks ok, Reviewed-by: Darrick J. Wong <djwong@kernel.org> --D > --- > common/rc | 28 ++++++++++++++++++++++++++++ > tests/generic/574 | 36 ++++-------------------------------- > 2 files changed, 32 insertions(+), 32 deletions(-) > > diff --git a/common/rc b/common/rc > index 163041fea5b9..fa7942809d6c 100644 > --- a/common/rc > +++ b/common/rc > @@ -52,6 +52,34 @@ _pwrite_byte() { > $XFS_IO_PROG $xfs_io_args -f -c "pwrite -S $pattern $offset $len" "$file" > } > > +_round_up_to_page_boundary() > +{ > + local n=$1 > + local page_size=$(_get_page_size) > + > + echo $(( (n + page_size - 1) & ~(page_size - 1) )) > +} > + > +_mread() > +{ > + local file=$1 > + local offset=$2 > + local length=$3 > + local map_len=$(_round_up_to_page_boundary $(_get_filesize $file)) > + > + # Some callers expect xfs_io to crash with SIGBUS due to the mread, > + # causing the shell to print "Bus error" to stderr. To allow this > + # message to be redirected, execute xfs_io in a new shell instance. > + # However, for this to work reliably, we also need to prevent the new > + # shell instance from optimizing out the fork and directly exec'ing > + # xfs_io. The easiest way to do that is to append 'true' to the > + # commands, so that xfs_io is no longer the last command the shell sees. > + # Don't let it write core files to the filesystem. > + bash -c "trap '' SIGBUS; ulimit -c 0; $XFS_IO_PROG -r $file \ > + -c 'mmap -r 0 $map_len' \ > + -c 'mread -v $offset $length'; true" > +} > + > # mmap-write a byte into a range of a file > _mwrite_byte() { > local pattern="$1" > diff --git a/tests/generic/574 b/tests/generic/574 > index cb42baaa67aa..d44c23e5abc2 100755 > --- a/tests/generic/574 > +++ b/tests/generic/574 > @@ -52,34 +52,6 @@ setup_zeroed_file() > cmp $fsv_orig_file $fsv_file > } > > -round_up_to_page_boundary() > -{ > - local n=$1 > - local page_size=$(_get_page_size) > - > - echo $(( (n + page_size - 1) & ~(page_size - 1) )) > -} > - > -mread() > -{ > - local file=$1 > - local offset=$2 > - local length=$3 > - local map_len=$(round_up_to_page_boundary $(_get_filesize $file)) > - > - # Some callers expect xfs_io to crash with SIGBUS due to the mread, > - # causing the shell to print "Bus error" to stderr. To allow this > - # message to be redirected, execute xfs_io in a new shell instance. > - # However, for this to work reliably, we also need to prevent the new > - # shell instance from optimizing out the fork and directly exec'ing > - # xfs_io. The easiest way to do that is to append 'true' to the > - # commands, so that xfs_io is no longer the last command the shell sees. > - # Don't let it write core files to the filesystem. > - bash -c "trap '' SIGBUS; ulimit -c 0; $XFS_IO_PROG -r $file \ > - -c 'mmap -r 0 $map_len' \ > - -c 'mread -v $offset $length'; true" > -} > - > corruption_test() > { > local block_size=$1 > @@ -142,7 +114,7 @@ corruption_test() > fi > > # Reading the full file via mmap should fail. > - mread $fsv_file 0 $file_len >/dev/null 2>$tmp.err > + _mread $fsv_file 0 $file_len >/dev/null 2>$tmp.err > if ! grep -q 'Bus error' $tmp.err; then > echo "Didn't see SIGBUS when reading file via mmap" > cat $tmp.err > @@ -150,7 +122,7 @@ corruption_test() > > # Reading just the corrupted part via mmap should fail. > if ! $is_merkle_tree; then > - mread $fsv_file $zap_offset $zap_len >/dev/null 2>$tmp.err > + _mread $fsv_file $zap_offset $zap_len >/dev/null 2>$tmp.err > if ! grep -q 'Bus error' $tmp.err; then > echo "Didn't see SIGBUS when reading corrupted part via mmap" > cat $tmp.err > @@ -174,10 +146,10 @@ corrupt_eof_block_test() > head -c $zap_len /dev/zero | tr '\0' X \ > | _fsv_scratch_corrupt_bytes $fsv_file $file_len > > - mread $fsv_file $file_len $zap_len >$tmp.out 2>$tmp.err > + _mread $fsv_file $file_len $zap_len >$tmp.out 2>$tmp.err > > head -c $file_len /dev/zero >$tmp.zeroes > - mread $tmp.zeroes $file_len $zap_len >$tmp.zeroes_out > + _mread $tmp.zeroes $file_len $zap_len >$tmp.zeroes_out > > grep -q 'Bus error' $tmp.err || diff $tmp.out $tmp.zeroes_out > } > -- > 2.43.0 > >
diff --git a/common/rc b/common/rc index 163041fea5b9..fa7942809d6c 100644 --- a/common/rc +++ b/common/rc @@ -52,6 +52,34 @@ _pwrite_byte() { $XFS_IO_PROG $xfs_io_args -f -c "pwrite -S $pattern $offset $len" "$file" } +_round_up_to_page_boundary() +{ + local n=$1 + local page_size=$(_get_page_size) + + echo $(( (n + page_size - 1) & ~(page_size - 1) )) +} + +_mread() +{ + local file=$1 + local offset=$2 + local length=$3 + local map_len=$(_round_up_to_page_boundary $(_get_filesize $file)) + + # Some callers expect xfs_io to crash with SIGBUS due to the mread, + # causing the shell to print "Bus error" to stderr. To allow this + # message to be redirected, execute xfs_io in a new shell instance. + # However, for this to work reliably, we also need to prevent the new + # shell instance from optimizing out the fork and directly exec'ing + # xfs_io. The easiest way to do that is to append 'true' to the + # commands, so that xfs_io is no longer the last command the shell sees. + # Don't let it write core files to the filesystem. + bash -c "trap '' SIGBUS; ulimit -c 0; $XFS_IO_PROG -r $file \ + -c 'mmap -r 0 $map_len' \ + -c 'mread -v $offset $length'; true" +} + # mmap-write a byte into a range of a file _mwrite_byte() { local pattern="$1" diff --git a/tests/generic/574 b/tests/generic/574 index cb42baaa67aa..d44c23e5abc2 100755 --- a/tests/generic/574 +++ b/tests/generic/574 @@ -52,34 +52,6 @@ setup_zeroed_file() cmp $fsv_orig_file $fsv_file } -round_up_to_page_boundary() -{ - local n=$1 - local page_size=$(_get_page_size) - - echo $(( (n + page_size - 1) & ~(page_size - 1) )) -} - -mread() -{ - local file=$1 - local offset=$2 - local length=$3 - local map_len=$(round_up_to_page_boundary $(_get_filesize $file)) - - # Some callers expect xfs_io to crash with SIGBUS due to the mread, - # causing the shell to print "Bus error" to stderr. To allow this - # message to be redirected, execute xfs_io in a new shell instance. - # However, for this to work reliably, we also need to prevent the new - # shell instance from optimizing out the fork and directly exec'ing - # xfs_io. The easiest way to do that is to append 'true' to the - # commands, so that xfs_io is no longer the last command the shell sees. - # Don't let it write core files to the filesystem. - bash -c "trap '' SIGBUS; ulimit -c 0; $XFS_IO_PROG -r $file \ - -c 'mmap -r 0 $map_len' \ - -c 'mread -v $offset $length'; true" -} - corruption_test() { local block_size=$1 @@ -142,7 +114,7 @@ corruption_test() fi # Reading the full file via mmap should fail. - mread $fsv_file 0 $file_len >/dev/null 2>$tmp.err + _mread $fsv_file 0 $file_len >/dev/null 2>$tmp.err if ! grep -q 'Bus error' $tmp.err; then echo "Didn't see SIGBUS when reading file via mmap" cat $tmp.err @@ -150,7 +122,7 @@ corruption_test() # Reading just the corrupted part via mmap should fail. if ! $is_merkle_tree; then - mread $fsv_file $zap_offset $zap_len >/dev/null 2>$tmp.err + _mread $fsv_file $zap_offset $zap_len >/dev/null 2>$tmp.err if ! grep -q 'Bus error' $tmp.err; then echo "Didn't see SIGBUS when reading corrupted part via mmap" cat $tmp.err @@ -174,10 +146,10 @@ corrupt_eof_block_test() head -c $zap_len /dev/zero | tr '\0' X \ | _fsv_scratch_corrupt_bytes $fsv_file $file_len - mread $fsv_file $file_len $zap_len >$tmp.out 2>$tmp.err + _mread $fsv_file $file_len $zap_len >$tmp.out 2>$tmp.err head -c $file_len /dev/zero >$tmp.zeroes - mread $tmp.zeroes $file_len $zap_len >$tmp.zeroes_out + _mread $tmp.zeroes $file_len $zap_len >$tmp.zeroes_out grep -q 'Bus error' $tmp.err || diff $tmp.out $tmp.zeroes_out }
We want a shared way to use mmap in a way that we can test for the SIGBUS, provide a shared routine which other tests can leverage. Suggested-by: "Darrick J. Wong" <djwong@kernel.org> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> --- common/rc | 28 ++++++++++++++++++++++++++++ tests/generic/574 | 36 ++++-------------------------------- 2 files changed, 32 insertions(+), 32 deletions(-)