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SubjectRe: [PATCH 1/2] jffs2: implement mount option parsing and compression overriding
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Hi,

please, cc the fs-devel mailing list when you sumbit v2.

On Sat, 2011-10-15 at 12:50 -0700, Andres Salomon wrote:
> Currently jffs2 has compile-time constants (and .config options)
> controlling whether or not the various compression/decompression
> drivers are built in and enabled. This is fine for embedded
> systems, but it clashes with distribution kernels. Distro kernels
> tend to turn on everything; this causes OpenFirmware to fall
> over, as it understands ZLIB-compressed inodes. Booting a kernel
> that has LZO compression enabled, writing to the boot partition,
> and then rebooting causes OFW to fail to read the kernel from
> the filesystem. This is because LZO compression has priority
> when writing new data to jffs2, if LZO is enabled.
>
> This patch adds mount option parsing, and a single supported
> option ("compr=none"). This adds the flexibility of being
> able to specify which compressor overrides on a per-superblock
> basis. For now, we can simply disable compression;
> additional flexibility coming soon.
>
> Signed-off-by: Andres Salomon <dilinger@queued.net>

You forgot to implement .show_options method of
'struct super_operations' - it is needed to make sure 'compr=none'
is shown when you do 'cat /proc/mounts'.


> + err = jffs2_parse_options(c, data);
> + if (err) {
> + printk(KERN_ERR "JFFS2 error: invalid or unknown mount option\n");

'jffs2_parse_options()' prints the error message, do not duplicate it
please.

> + return -EINVAL;
> + }
> +
> + return jffs2_do_remount_fs(sb, flags, data);
> +}
> +
> static const struct super_operations jffs2_super_operations =
> {
> .alloc_inode = jffs2_alloc_inode,
> @@ -166,6 +234,13 @@ static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
> c->os_priv = sb;
> sb->s_fs_info = c;
>
> + ret = jffs2_parse_options(c, data);
> + if (ret) {
> + printk(KERN_ERR "JFFS2 error: invalid or unknown mount option\n");

Ditto - kill this printk please.


--
Best Regards,
Artem Bityutskiy



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