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Date: Mon, 20 Dec 2021 15:40:59 -0500
From: "Theodore Ts'o" <tytso@....edu>
To: guan@...u.me
Cc: fstests@...r.kernel.org,
Ext4 Developers List <linux-ext4@...r.kernel.org>,
"Theodore Ts'o" <tytso@....edu>, Eric Whitney <enwlinux@...il.com>
Subject: [PATCH] ext4/033: test EXT4_IOC_RESIZE_FS by calling the ioctl directly
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
+
+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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