Re: Race condition between iget_locked() and evict_inodes()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Al,

> On 29 Sep 2016, at 13:17, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> 
> On Thu, Sep 29, 2016 at 11:53:21AM +0000, Anton Altaparmakov wrote:
>> Thus if the events happen in this order:
>> 
>> evict_inodes()				iget_locked() in find_inode_fast()
> 
> ... you are buggered, because somebody is trying to grab a reference
> to inode on a filesystem that is being shut down.  Look at evict_inode()
> caller...

But what if that somebody is simply the file system being shutdown trying to flush some dirty metadata to disk which is stored in a file and thus accessed via an inode and thus iget on the inode is needed?  Surely that is allowed even during shutdown.  Once the write is complete iput() is called which then immediately evicts the inode as MS_ACTIVE is clear...

Best regards,

	Anton
-- 
Anton Altaparmakov <anton at tuxera.com> (replace at with @)
Lead in File System Development, Tuxera Inc., http://www.tuxera.com/
Linux NTFS maintainer

--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux