Re: [PATCH] dcache: unlock inode->i_lock before goto restart tag in, d_prune_aliases

[Zhiqiang Liu <liuzhiqiang26@huawei.com>]

On 2020/4/16 9:46, Eric Biggers wrote:
> On Wed, Apr 15, 2020 at 09:20:33PM +0800, Zhiqiang Liu wrote:
>> From: Zhiqiang Liu <liuzhiqiang26@huawei.com>
>>
>> coccicheck reports:
>>   fs/dcache.c:1027:1-10: second lock on line 1027
>>
>> In d_prune_aliases, before goto restart we should unlock
>> inode->i_lock.
>>
>> Fixes: 29355c3904e ("d_prune_alias(): just lock the parent and call __dentry_kill()")
>> Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
>> Signed-off-by: Feilong Lin <linfeilong@huawei.com>
>> ---
>>  fs/dcache.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/fs/dcache.c b/fs/dcache.c
>> index b280e07e162b..1532ebe9d9ca 100644
>> --- a/fs/dcache.c
>> +++ b/fs/dcache.c
>> @@ -1030,6 +1030,7 @@ void d_prune_aliases(struct inode *inode)
>>  		if (!dentry->d_lockref.count) {
>>  			struct dentry *parent = lock_parent(dentry);
>>  			if (likely(!dentry->d_lockref.count)) {
>> +				spin_unlock(&inode->i_lock);
>>  				__dentry_kill(dentry);
>>  				dput(parent);
>>  				goto restart;
>> -- 
> 
> Doesn't __dentry_kill() already do the unlock, via dentry_unlink_inode()?
> 
> - Eric
> 
Yes, you are right. Sorry for that. Please ignore this patch.
> .
>