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Date: Wed, 5 Jan 2022 23:57:43 +0800
From: Zorro Lang <zlang@...hat.com>
To: Theodore Ts'o <tytso@....edu>
Cc: guan@...u.me, fstests@...r.kernel.org,
Ext4 Developers List <linux-ext4@...r.kernel.org>,
Eric Whitney <enwlinux@...il.com>
Subject: Re: [PATCH] ext4/033: test EXT4_IOC_RESIZE_FS by calling the ioctl
directly
On Mon, Dec 20, 2021 at 03:40:59PM -0500, Theodore Ts'o wrote:
> E2fsprogs commits 4ea80d031c7e ("resize2fs: adjust new size of the
> file system to allow a successful resize") and 50088b1996cc
> ("resize2fs: attempt to keep the # of inodes valid by removing the
> last bg") will automatically reduce the requested new size of the file
> system by up to a single block group to avoid overflowing the 32-bit
> inode count. This interferes with ext4/033's test of kernel commit
> 4f2f76f75143 ("ext4: Forbid overflowing inode count when # resizing".)
>
> Address this by creating a new test program, ext4_resize which calls
> the EXT4_IOC_RESIZE_FS ioctl directly so we can correctly test the
> kernel's online resize code.
>
> Reported-by: Eric Whitney <enwlinux@...il.com>
> Signed-off-by: Theodore Ts'o <tytso@....edu>
> ---
> .gitignore | 1 +
> src/Makefile | 2 +-
> src/ext4_resize.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++
> tests/ext4/033 | 16 ++++++++++-----
> 4 files changed, 63 insertions(+), 6 deletions(-)
> create mode 100644 src/ext4_resize.c
>
> diff --git a/.gitignore b/.gitignore
> index 9e6d2fd5..65b93307 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -77,6 +77,7 @@ tags
> /src/dirperf
> /src/dirstress
> /src/e4compact
> +/src/ext4_resize
> /src/fault
> /src/feature
> /src/fiemap-tester
> diff --git a/src/Makefile b/src/Makefile
> index 25ab061d..1737ed0e 100644
> --- a/src/Makefile
> +++ b/src/Makefile
> @@ -31,7 +31,7 @@ LINUX_TARGETS = xfsctl bstat t_mtab getdevicesize preallo_rw_pattern_reader \
> dio-invalidate-cache stat_test t_encrypted_d_revalidate \
> attr_replace_test swapon mkswap t_attr_corruption t_open_tmpfiles \
> fscrypt-crypt-util bulkstat_null_ocount splice-test chprojid_fail \
> - detached_mounts_propagation
> + detached_mounts_propagation ext4_resize
>
> EXTRA_EXECS = dmerror fill2attr fill2fs fill2fs_check scaleread.sh \
> btrfs_crc32c_forged_name.py
> diff --git a/src/ext4_resize.c b/src/ext4_resize.c
> new file mode 100644
> index 00000000..1ac51e6f
> --- /dev/null
> +++ b/src/ext4_resize.c
> @@ -0,0 +1,50 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/*
> + * Test program which uses the raw ext4 resize_fs ioctl directly.
> + */
> +
> +#include <stdio.h>
> +#include <fcntl.h>
> +#include <errno.h>
> +#include <unistd.h>
> +#include <stdint.h>
> +#include <stdlib.h>
> +#include <sys/ioctl.h>
> +#include <sys/mount.h>
> +
> +typedef unsigned long long __u64;
> +
> +#ifndef EXT4_IOC_RESIZE_FS
> +#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
> +#endif
This patch looks good to me, I just want to ask if we'd better to try to include
ext2fs/ext2fs.h at here? And of course, check it in configure.ac.
The EXT4_IOC_RESIZE_FS looks like defined in ext2fs/ext2_fs.h which comes from
e2fsprogs-devel package. I can't find this definition from kernel-hearders package.
As you're the expert of this part, please correct me if it's wrong :)
Thanks,
Zorro
> +
> +int main(int argc, char **argv)
> +{
> + __u64 new_size;
> + int error, fd;
> + char *tmp = NULL;
> +
> + if (argc != 3) {
> + fputs("insufficient arguments\n", stderr);
> + return 1;
> + }
> + fd = open(argv[1], O_RDONLY);
> + if (!fd) {
> + perror(argv[1]);
> + return 1;
> + }
> +
> + new_size = strtoull(argv[2], &tmp, 10);
> + if ((errno) || (*tmp != '\0')) {
> + fprintf(stderr, "%s: invalid new size\n", argv[0]);
> + return 1;
> + }
> +
> + error = ioctl(fd, EXT4_IOC_RESIZE_FS, &new_size);
> + if (error < 0) {
> + perror("EXT4_IOC_RESIZE_FS");
> + return 1;
> + }
> + return 0;
> +}
> diff --git a/tests/ext4/033 b/tests/ext4/033
> index 1bc14c03..22041a17 100755
> --- a/tests/ext4/033
> +++ b/tests/ext4/033
> @@ -5,7 +5,8 @@
> # FS QA Test 033
> #
> # Test s_inodes_count overflow for huge filesystems. This bug was fixed
> -# by commit "ext4: Forbid overflowing inode count when resizing".
> +# by commit 4f2f76f75143 ("ext4: Forbid overflowing inode count when
> +# resizing".)
> #
> . ./common/preamble
> _begin_fstest auto ioctl resize
> @@ -28,7 +29,9 @@ _supported_fs ext4
> _require_scratch_nocheck
> _require_dmhugedisk
> _require_dumpe2fs
> -_require_command "$RESIZE2FS_PROG" resize2fs
> +_require_test_program ext4_resize
> +
> +EXT4_RESIZE=$here/src/ext4_resize
>
> # Figure out whether device is large enough
> devsize=$(blockdev --getsize64 $SCRATCH_DEV)
> @@ -68,7 +71,8 @@ $DUMPE2FS_PROG -h $DMHUGEDISK_DEV >> $seqres.full 2>&1
>
> # This should fail, s_inodes_count would just overflow!
> echo "Resizing to inode limit + 1..."
> -$RESIZE2FS_PROG $DMHUGEDISK_DEV $((limit_groups*group_blocks)) >> $seqres.full 2>&1
> +echo $EXT4_RESIZE $SCRATCH_MNT $((limit_groups*group_blocks)) >> $seqres.full 2>&1
> +$EXT4_RESIZE $SCRATCH_MNT $((limit_groups*group_blocks)) >> $seqres.full 2>&1
> if [ $? -eq 0 ]; then
> echo "Resizing succeeded but it should fail!"
> exit
> @@ -76,7 +80,8 @@ fi
>
> # This should succeed, we are maxing out inodes
> echo "Resizing to max group count..."
> -$RESIZE2FS_PROG $DMHUGEDISK_DEV $(((limit_groups-1)*group_blocks)) >> $seqres.full 2>&1
> +echo $EXT4_RESIZE $SCRATCH_MNT $(((limit_groups-1)*group_blocks)) >> $seqres.full 2>&1
> +$EXT4_RESIZE $SCRATCH_MNT $(((limit_groups-1)*group_blocks)) >> $seqres.full 2>&1
> if [ $? -ne 0 ]; then
> echo "Resizing failed!"
> exit
> @@ -87,7 +92,8 @@ $DUMPE2FS_PROG -h $DMHUGEDISK_DEV >> $seqres.full 2>&1
>
> # This should fail, s_inodes_count would overflow by quite a bit!
> echo "Resizing to device size..."
> -$RESIZE2FS_PROG $DMHUGEDISK_DEV >> $seqres.full 2>&1
> +echo $EXT4_RESIZE $SCRATCH_MNT $(((limit_groups + 16)*group_blocks)) >> $seqres.full 2>&1
> +$EXT4_RESIZE $SCRATCH_MNT $(((limit_groups + 16)*group_blocks)) >> $seqres.full 2>&1
> if [ $? -eq 0 ]; then
> echo "Resizing succeeded but it should fail!"
> exit
> --
> 2.31.0
>
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