Hello!

The following patch disables loading of f2fs module on architectures
which have PAGE_SIZE > 4096 , since it is impossible to mount f2fs on
such architectures , log messages are:

root@ttip:/1/mator/xfstests-dev# mount -t f2fs /dev/vdiskb1 /mnt
mount: /mnt: wrong fs type, bad option, bad superblock on
/dev/vdiskb1, missing codepage or helper program, or other error.
root@ttip:/1/mator/xfstests-dev# file -s /dev/vdiskb1
/dev/vdiskb1: F2FS filesystem,
UUID=1d8b9ca4-2389-4910-af3b-10998969f09c, volume name ""

May 15 18:03:13 ttip kernel: F2FS-fs (vdiskb1): Invalid
page_cache_size (8192), supports only 4KB
May 15 18:03:13 ttip kernel: F2FS-fs (vdiskb1): Can't find valid F2FS
filesystem in 1th superblock
May 15 18:03:13 ttip kernel: F2FS-fs (vdiskb1): Invalid
page_cache_size (8192), supports only 4KB
May 15 18:03:13 ttip kernel: F2FS-fs (vdiskb1): Can't find valid F2FS
filesystem in 2th superblock
May 15 18:03:13 ttip kernel: F2FS-fs (vdiskb1): Invalid
page_cache_size (8192), supports only 4KB

which was introduced by git commit 5c9b469295fb6b10d98923eab5e79c4edb80ed20

tested on git kernel v4.17-rc5-20-g21b9f1c7e319

Signed-off-by: Anatoly Pugachev <mator...@gmail.com>
---

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 42d564c5ccd0..3071771bf261 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -3063,6 +3063,11 @@ static int __init init_f2fs_fs(void)
 {
        int err;

+       if (PAGE_SIZE > 4096) {
+               printk("F2FS not supported on PAGE_SIZE > 4096\n");
+               return -1;
+       }
+
        f2fs_build_trace_ios();

        err = init_inodecache();

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