lkml.org 
[lkml]   [2017]   [May]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Question on fscrypt_d_revalidate() and fstest generic/429
From
Date
Eric,

Am 16.05.2017 um 01:25 schrieb Eric Biggers:
> On Mon, May 15, 2017 at 09:51:03PM +0200, Richard Weinberger wrote:
>>>
>>> The test is repeatedly creating and removing a directory "dir" while lookups are
>>> being done in it. It seems the problem is that many dentries are being created
>>> for "dir", and they pin many different inodes, all at the same time. This
>>> actually happens for ext4 too; it just doesn't cause an observable error.
>>>
>>> I doubt it's the right solution to make fscrypt_d_revalidate() look at
>>> ->i_nlink, since ->d_revalidate() is meant to validate the filename, not the
>>> inode. I think there is probably a VFS bug that is causing the dentries to not
>>> be freed.
>>
>> Not sure. Al? :-)
>>
>
> I can reproduce this on an unencrypted directory after updating path_init() in
> fs/namei.c to always clear LOOKUP_RCU, so that all path lookups are done in
> ref-walk mode. So I think fscrypt_d_revalidate() was only relevant because it
> causes all path lookups to drop out of rcu-walk mode.

On ext4 or UBIFS?

Thanks,
//richard

\
 
 \ /
  Last update: 2017-05-16 08:48    [W:0.061 / U:2.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site