[PATCH] ubifs: Fix O_TMPFILE corner case in ubifs_link()

[Richard Weinberger]

Am 30.03.2017 um 11:49 schrieb Richard Weinberger:
> Am 30.03.2017 um 11:32 schrieb Adrian Hunter:
>>> diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
>>> index 0858213a4e63..0139155045fe 100644
>>> --- a/fs/ubifs/dir.c
>>> +++ b/fs/ubifs/dir.c
>>> @@ -748,6 +748,11 @@ static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
>>>  		goto out_fname;
>>>  
>>>  	lock_2_inodes(dir, inode);
>>> +
>>> +	/* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */
>>> +	if (inode->i_nlink == 0)
>>> +		ubifs_delete_orphan(c, inode->i_ino);
>>
>> Isn't there also a deletion inode in the journal?  If the recovery sees that
>> won't it delete the file data?
> 
> Yes, but ubifs_link() adds a new journal entry which revives the inode.
> This should cancel out the deletion, right?
> You know the UBIFS journal better than I do. :-)

Reading deeper into the proved that I was wrong.
AFAIKT UBIFS' journal has currently no way to revive a deleted inode.
So, we have to think about a new solution.

Thanks,
//richard