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

[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. :-)

Thanks,
//richard