Re: [f2fs-dev] [PATCH] f2fs: fix error handling on device alias check in rename and unlink

[Chao Yu <chao@kernel.org>]

On 8/22/26 08:12, Jaegeuk Kim wrote:
> On 08/22, Chao Yu wrote:
>> On 8/21/26 23:26, Jaegeuk Kim via Linux-f2fs-devel wrote:
>>> On 08/21, Daeho Jeong wrote:
>>>> From: Daeho Jeong <daehojeong@google.com>
>>>>
>>>> In f2fs_rename() and f2fs_unlink(), directly returning -EPERM when
>>>> encountering a device aliasing file bypasses the cleanup path.
>>>>
>>>> Fix this by setting err to -EPERM and jumping to the proper cleanup
>>>> labels (out_dir and out) instead of returning immediately.
>>>>
>>>> Fixes: a737e409a3d6 ("f2fs: support dynamic reserve/release for device aliasing")
>>>> Cc: stable@kernel.org
>>>
>>> Applied without Fixes and stable, since the original patch has not been
>>> upstreamed.
>>
>> Jaegeuk, if we don't plan to merge them, we'd better keep the Fixes and stable
>> line, otherwise, once the two patches be upstreamed, we may missed to backport
>> the fix one due to the missing lines?
> 
> My concern is the never existing hash in upstream. And, I don't think this will
> go into any LTS.

Oh, I see, actually, my concern is developers may potentially miss this fix when
backporting related feature.

Thanks,

> 
>>
>> Thanks,
>>
>>>
>>>> Reported-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
>>>> Signed-off-by: Daeho Jeong <daehojeong@google.com>
>>>> Reviewed-by: Chao Yu <chao@kernel.org>
>>>> ---
>>>>    fs/f2fs/namei.c | 12 ++++++++----
>>>>    1 file changed, 8 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
>>>> index 784f636244e1..b9b15c5d28de 100644
>>>> --- a/fs/f2fs/namei.c
>>>> +++ b/fs/f2fs/namei.c
>>>> @@ -571,8 +571,10 @@ static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
>>>>    	trace_f2fs_unlink_enter(dir, dentry);
>>>> -	if (IS_DEVICE_ALIASING(inode))
>>>> -		return -EPERM;
>>>> +	if (IS_DEVICE_ALIASING(inode)) {
>>>> +		err = -EPERM;
>>>> +		goto out;
>>>> +	}
>>>>    	if (unlikely(f2fs_cp_error(sbi))) {
>>>>    		err = -EIO;
>>>> @@ -1025,8 +1027,10 @@ static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
>>>>    	}
>>>>    	if (new_inode) {
>>>> -		if (IS_DEVICE_ALIASING(new_inode))
>>>> -			return -EPERM;
>>>> +		if (IS_DEVICE_ALIASING(new_inode)) {
>>>> +			err = -EPERM;
>>>> +			goto out_dir;
>>>> +		}
>>>>    		err = -ENOTEMPTY;
>>>>    		if (old_is_dir && !f2fs_empty_dir(new_inode))
>>>> -- 
>>>> 2.55.0.766.g2966f0265a-goog
>>>>
>>>>
>>>>
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>>>
>>>
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>>