Tested the JFFS2 on 5.4 kernel as the instruction said, still got some
errors, any ideas?
Without the patch,
root@imx8mmevk:~# cat /proc/mtd
dev: size erasesize name
mtd0: 00400000 00020000 "mtdram test device"
mtd1: 04000000 00020000 "5d120000.spi"
root@imx8mmevk:~# mtd_debug info /dev/mtd0
mtd.type = MTD_RAM
mtd.flags = MTD_CAP_RAM
mtd.size = 4194304 (4M)
mtd.erasesize = 131072 (128K)
mtd.writesize = 1
mtd.oobsize = 0
regions = 0
root@imx8mmevk:~# flash_erase /dev/mtd0 0 0
Erasing 128 Kibyte @ 3e0000 -- 100 % complete
root@imx8mmevk:~# mount -t jffs2 /dev/mtdblock0 test_dir/
mount: /home/root/test_dir: wrong fs type, bad option, bad superblock
on /dev/mtdblock0, missing codepage or helper program, or other error.
With the patch,
root@imx8mmevk:~# cat /proc/mtd
dev: size erasesize name
mtd0: 00400000 00020000 "mtdram test device"
mtd1: 04000000 00020000 "5d120000.spi"
root@imx8mmevk:~# mtd_debug info /dev/mtd0
mtd.type = MTD_RAM
mtd.flags = MTD_CAP_RAM
mtd.size = 4194304 (4M)
mtd.erasesize = 131072 (128K)
mtd.writesize = 1
mtd.oobsize = 0
regions = 0
root@imx8mmevk:~# flash_erase /dev/mtd0 0 0
Erasing 128 Kibyte @ 3e0000 -- 100 % complete
root@imx8mmevk:~# mount -t jffs2 /dev/mtdblock0 test_dir/
root@imx8mmevk:~# mount
/dev/mtdblock0 on /home/root/test_dir type jffs2 (rw,relatime)
BUT, it's not writable.
root@imx8mmevk:~# cp test_file test_dir/
cp: error writing 'test_dir/test_file': Invalid argument
root@imx8mmevk:~# dd if=/dev/urandom of=test_dir/test_file bs=1k count=1
dd: error writing 'test_dir/test_file': Invalid argument
1+0 records in
0+0 records out
0 bytes copied, 0.000855156 s, 0.0 kB/s
On Fri, Sep 27, 2019 at 3:38 AM Sergei Shtylyov
<sergei.shtylyov@xxxxxxxxxxxxxxxxxx> wrote:
>
> Hello!
>
> On 26.09.2019 17:21, David Howells wrote:
>
> > The mounting of jffs2 is broken due to the changes from the new mount API
> > because it specifies a "source" operation, but then doesn't actually
> > process it. But because it specified it, it doesn't return -ENOPARAM and
>
> What specified what? Too many "it"'s to figure that out. :-)
>
> > the caller doesn't process it either and the source gets lost.
> >
> > Fix this by simply removing the source parameter from jffs2 and letting the
> > VFS deal with it in the default manner.
> >
> > To test it, enable CONFIG_MTD_MTDRAM and allow the default size and erase
> > block size parameters, then try and mount the /dev/mtdblock<N> file that
> > that creates as jffs2. No need to initialise it.
>
> One "that" should be enough. :-)
>
> > Fixes: ec10a24f10c8 ("vfs: Convert jffs2 to use the new mount API")
> > Reported-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> > Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
> > cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
> > cc: Richard Weinberger <richard@xxxxxx>
> > cc: linux-mtd@xxxxxxxxxxxxxxxxxxx
> [...]
>
> MBR, Sergei
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
--
Sincerely,
Han XU
