Re: [f2fs-dev] [PATCH v3] f2fs: compress: support chksum

[Chao Yu]

On 2020/12/8 4:37, Eric Biggers wrote:
> On Thu, Nov 26, 2020 at 06:32:09PM +0800, Chao Yu wrote:
> > +	if (!ret && fi->i_compress_flag & 1 << COMPRESS_CHKSUM) {
>
> This really could use some parentheses.  People shouldn't have to look up a
> C operator precedence table to understand the code.

Will add parentheses to avoid misread.

> > +		u32 provided = le32_to_cpu(dic->cbuf->chksum);
> > +		u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
> > +
> > +		if (provided != calculated) {
> > +			if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
> > +				set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
> > +				printk_ratelimited(
> > +					"%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
> > +					KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
> > +					provided, calculated);
> > +			}
> > +			set_sbi_flag(sbi, SBI_NEED_FSCK);
> > +			WARN_ON_ONCE(1);
>
> WARN, WARN_ON_ONCE, BUG, BUG_ON, etc. are only for kernel bugs, not for invalid
> inputs from disk or userspace.
>
> There is already a log message printed just above, so it seems this WARN_ON_ONCE
> should just be removed.

Jaegeuk wants to give WARN_ON and marking a FSCK flag without returning EFSCORRUPTED,

Jaegeuk, thoughts?

Thanks,

> - Eric
> .