# How to using F2FS in EL9? **URL:** \ **Category:** Special Interest Groups\ **Created:** [April 30, 2025, 5:01am UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291 "2025-04-30T05:01:50Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![berlin](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@berlin](https://forums.rockylinux.org/u/berlin)\ **Post date:** [April 30, 2025, 5:01am UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/1 "2025-04-30T05:01:50Z")
Any way to using f2fs inside rocky9? I have a disk is f2fs, which works in centos7. However, after swich to rocky9, f2fs not surported any more ```auto mount: /mnt/nvme1: unknown filesystem type 'f2fs'. ``` I have tried to rpmbuild the ‘f2fs-tools’ from `git clone https://src.fedoraproject.org/rpms/f2fs-tools.git`, and installed the local builed f2fs-tools. however it is not work. other testing: ```auto # modprobe f2fs modprobe: FATAL: Module f2fs not found in directory /lib/modules/5.14.0-503.38.1.el9_5.x86_64 ``` ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [April 30, 2025, 7:24am UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/2 "2025-04-30T07:24:14Z")
The support for filesystems, “drivers”, is in kernel – most often as module. The `f2fs-tools` are mere userland tools that would talk to the kernel. The kernel config for CentOS 7 did not _set_ CONFIG\_F2FS\_FS. Therefore, CentOS 7 did not support f2fs “out of the box” either. You must have procured f2fs module for CentOS 7 somehow. How did you do that? The ELRepo’s `kernel-ml` and `kernel-lt` upstream kernel builds for el9 seem to include the f2fs module. ---
**Author:** ![berlin](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@berlin](https://forums.rockylinux.org/u/berlin)\ **Post date:** [April 30, 2025, 7:44am UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/3 "2025-04-30T07:44:57Z")
Yes, just noticed that my centos7 uses kernel-ml. Looks like I can only use elrepo’s kernel in el9. And just tested in EL10, the kernel is the same as EL9, which is not suport f2fs. ---
**Author:** ![berlin](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@berlin](https://forums.rockylinux.org/u/berlin)\ **Post date:** [April 30, 2025, 7:55am UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/4 "2025-04-30T07:55:16Z")
It would be nice if there was a way to manually add kernel modules into the official kernel. ( Just like adding a new NIC driver. ) ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [April 30, 2025, 8:25am UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/5 "2025-04-30T08:25:30Z")
ELRepo, CentOS Kmods SIG, Rocky SIG/kernel, etc seem to be doing just that: build kernel modules and package them for easy ‘dnf install’. The ‘dkms’ and ‘akmod’ tools seem able to rebuild, if needed, modules from “sources” when new kernel boots (or installs). There clearly is a way. * * * How does one build one kernel module? I have no idea. ---
**Author:** ![gerry666uk](https://avatars.discourse-cdn.com/v4/letter/g/dbc845/32.png) [@gerry666uk](https://forums.rockylinux.org/u/gerry666uk)\ **Post date:** [May 1, 2025, 12:58pm UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/6 "2025-05-01T12:58:41Z")
> [@jlehtone](#): > > How does one build one kernel module? I have no idea. The last entry in this forum post has an example [https://forums.rockylinux.org/t/building-v4l-rpm-for-tbs-hardware/18014/10](https://forums.rockylinux.org/t/building-v4l-rpm-for-tbs-hardware/18014/10) But even then, there’s still the issue of how to sign it. ---
**Author:** ![berlin](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@berlin](https://forums.rockylinux.org/u/berlin)\ **Post date:** [May 2, 2025, 9:35am UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/7 "2025-05-02T09:35:30Z")
I found a way to build and add mod, that is, ```auto dnf install kernel-devel mkdir /root/mybuild cd /root/mybuild # download src dnf download --source kernel rpm2cpio kernel-5.14.0-503.40.1.el9_5.src.rpm | cpio -idmv tar -xvf linux-5.14.0-503.40.1.el9_5.tar.xz cd linux-5.14.0-503.40.1.el9_5 # make the module make CONFIG_F2FS_FS=m -C /usr/src/kernels/5.14.0-503.40.1.el9_5.x86_64 M=/root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs modules # insert module: f2fs.ko insmod ./fs/f2fs/f2fs.ko # check supported filesystems cat /proc/filesystems ``` However, the source-code may have some type of errors, the make is not finished fine, logs: ```auto [root@host linux-5.14.0-503.40.1.el9_5]# make CONFIG_F2FS_FS=m -C /usr/src/kernels/5.14.0-503.40.1.el9_5.x86_64 M=/root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs modules make: Entering directory '/usr/src/kernels/5.14.0-503.40.1.el9_5.x86_64' CC [M] /root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs/dir.o CC [M] /root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs/file.o CC [M] /root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs/inode.o /root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs/inode.c: In function ‘f2fs_iget_retry’: /root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs/inode.c:565:25: error: implicit declaration of function ‘congestion_wait’ [-Werror=implicit-function-declaration] 565 | congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT); | ^ ~~~~~~~~~~~~~~ /root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs/inode.c:565:41: error: ‘BLK_RW_ASYNC’ undeclared (first use in this function) 565 | congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT); | ^ ~~~~~~~~~~~ /root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs/inode.c:565:41: note: each undeclared identifier is reported only once for each function it appears in cc1: some warnings being treated as errors make[1]: *** [scripts/Makefile.build:249: /root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs/inode.o] Error 1 make: *** [Makefile:1944: /root/mybuild/linux-5.14.0-503.40.1.el9_5/fs/f2fs] Error 2 make: Leaving directory '/usr/src/kernels/5.14.0-503.40.1.el9_5.x86_64' ``` ---
**Author:** ![berlin](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@berlin](https://forums.rockylinux.org/u/berlin)\ **Post date:** [May 2, 2025, 1:19pm UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/8 "2025-05-02T13:19:26Z")
> [@berlin](#): > > Looks like I can only use elrepo’s kernel in el9. I Have tested to install the elrepo `kernel-lt` or `kernel-ml`. Unfortunately, however, none of them support f2fs. looks like I’ll have to build the mod, or kernel. ---
**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\ **Post date:** [May 2, 2025, 1:34pm UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/9 "2025-05-02T13:34:30Z")
> [@berlin](#): > > I Have tested to install the elrepo `kernel-lt` or `kernel-ml`. Unfortunately, however, none of them support f2fs. Really? The `dnf --repo=elrepo-kernel provides */f2fs.ko\*` claims that both of them have `f2fs.ko.xz` Would it not load, was the support missing even with that module loaded, or what? ---
**Author:** ![iwalker](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/iwalker/32/2599_2.png) [@iwalker](https://forums.rockylinux.org/u/iwalker)\ **Post date:** [May 2, 2025, 1:47pm UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/10 "2025-05-02T13:47:59Z")
It’s definitely there: ```auto root@zfs:~# modprobe f2fs root@zfs:~# lsmod | grep f2fs f2fs 823296 0 lz4hc_compress 24576 1 f2fs lz4_compress 36864 1 f2fs zstd_compress 299008 1 f2fs root@zfs:~# cat /etc/rocky-release Rocky Linux release 9.5 (Blue Onyx) root@zfs:~# uname -r 6.1.135-1.el9.elrepo.x86_64 ``` ---
**Author:** ![berlin](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@berlin](https://forums.rockylinux.org/u/berlin)\ **Post date:** [May 2, 2025, 2:06pm UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/11 "2025-05-02T14:06:09Z")
I was not run the `modprobe`， it works now for elrepo-kernel. ---
**Author:** ![berlin](https://avatars.discourse-cdn.com/v4/letter/b/41988e/32.png) [@berlin](https://forums.rockylinux.org/u/berlin)\ **Post date:** [May 2, 2025, 2:11pm UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/12 "2025-05-02T14:11:01Z")
I still expect, however, to go with the approach of loading self-built mods in the official kernel. > 1. elrepo not works with leapp, if want to update to EL10. > 2. If one installed nvidia drivers firstly, may will be not able to install elrepo kernel Any one have idea on the [err log of make modules](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/7) ---
**Author:** ![system](https://us1.discourse-cdn.com/flex020/uploads/rockylinux/original/1X/91b7219eec10e30013422e4df76c1d898711a5d5.svg) [@system](https://forums.rockylinux.org/u/system)\ **Post date:** [July 1, 2025, 2:11pm UTC](https://forums.rockylinux.org/t/how-to-using-f2fs-in-el9/18291/13 "2025-07-01T14:11:19Z")
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