f2fs: fix to drop meta_inode's page cache in f2fs_put_super()

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to drop meta_inode's page cache in f2fs_put_super()

syzbot reports a kernel bug as below:

F2FS-fs (loop1): detect filesystem reference count leak during umount, type: 10, count: 1

kernel BUG at fs/f2fs/super.c:1639!

CPU: 0 PID: 15451 Comm: syz-executor.1 Not tainted 6.5.0-syzkaller-09338-ge0152e7481c6 #0

RIP: 0010:f2fs_put_super+0xce1/0xed0 fs/f2fs/super.c:1639

Call Trace:

generic_shutdown_super+0x161/0x3c0 fs/super.c:693

kill_block_super+0x3b/0x70 fs/super.c:1646

kill_f2fs_super+0x2b7/0x3d0 fs/f2fs/super.c:4879

deactivate_locked_super+0x9a/0x170 fs/super.c:481

deactivate_super+0xde/0x100 fs/super.c:514

cleanup_mnt+0x222/0x3d0 fs/namespace.c:1254

task_work_run+0x14d/0x240 kernel/task_work.c:179

resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]

exit_to_user_mode_loop kernel/entry/common.c:171 [inline]

exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204

__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]

syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296

do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86

entry_SYSCALL_64_after_hwframe+0x63/0xcd

In f2fs_put_super(), it tries to do sanity check on dirty and IO

reference count of f2fs, once there is any reference count leak,

it will trigger panic.

The root case is, during f2fs_put_super(), if there is any IO error

in f2fs_wait_on_all_pages(), we missed to truncate meta_inode's page

cache later, result in panic, fix this case.