On Thu 28-06-12 11:44:03, Mikulas Patocka wrote: > On Thu, 28 Jun 2012, Jan Kara wrote: > > > > Do you have any other ideas what to do with it? > > Yeah, it's nasty and neither solution looks particularly appealing. One > > idea that came to my mind is: I'm trying to solve some races between direct > > IO, buffered IO, hole punching etc. by a new mapping interval lock. I'm not > > sure if it will go anywhere yet but if it does, we can fix the above race > > by taking the mapping lock for the whole block device around setting block > > size thus effectivelly disallowing any IO to it. > > > > Honza > > -- > > Jan Kara <jack@xxxxxxx> > > SUSE Labs, CR > > What races are you trying to solve? There used to be i_alloc_mem that > prevented direct i/o while the file is being truncated, but it disappeared > in recent kernels... i_alloc_sem has been replaced by inode_dio_wait() and friends. The problem is mainly with hole punching - see the thread starting here: http://www.spinics.net/lists/linux-ext4/msg32059.html Honza -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
