linux-kernel - Re: [f2fs-dev] [PATCH v4 2/2] f2fs: fix compat F2FS_IOC_{MOVE, GARBAGE_COLLECT}

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Date:   Sat, 7 Nov 2020 17:25:23 +0800
From:   Chao Yu <chao@...nel.org>
To:     Eric Biggers <ebiggers@...nel.org>, Chao Yu <yuchao0@...wei.com>
Cc:     jaegeuk@...nel.org, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH v4 2/2] f2fs: fix compat F2FS_IOC_{MOVE,
 GARBAGE_COLLECT}_RANGE

On 2020/11/7 2:03, Eric Biggers wrote:
> On Fri, Nov 06, 2020 at 02:53:31PM +0800, Chao Yu wrote:
>> +#if defined(__KERNEL__)
>> +struct compat_f2fs_gc_range {
>> +	u32 sync;
>> +	compat_u64 start;
>> +	compat_u64 len;
>> +};
> 
> There's no need to use '#if defined(__KERNEL__)' in kernel source files.
> 
> Likewise for compat_f2fs_move_range.

Correct.

> 
>> +static int f2fs_compat_ioc_gc_range(struct file *file, unsigned long arg)
>> +{
>> +	struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(file));
>> +	struct compat_f2fs_gc_range __user *urange;
>> +	struct f2fs_gc_range range;
>> +	int err;
>> +
>> +	if (unlikely(f2fs_cp_error(sbi)))
>> +		return -EIO;
>> +	if (!f2fs_is_checkpoint_ready(sbi))
>> +		return -ENOSPC;
> 
> I still don't understand why this checkpoint-related stuff is getting added
> here, and only to the compat versions of the ioctls.  It wasn't in the original
> version.  If they are needed then they should be added to __f2fs_ioc_gc_range()
> and __f2fs_ioc_move_range() (preferably by a separate patch) so that they are

If so, cp-related stuff will be checked redundantly in both f2fs_ioctl() and 
__f2fs_ioc_xxx() function for native GC_RANGE and MOVE_RANGE ioctls, it's not 
needed.

Thanks,

> done for both the native and compat versions of these ioctls.
> 
> - Eric
> 
> 
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