Re: [PATCH] UDF: fix deadlock on inode being dropped

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

 



[Jan Kara - Thu, Jun 07, 2007 at 04:41:21PM +0200]
| On Thu 07-06-07 17:54:58, Cyrill Gorcunov wrote:
| > [Jan Kara - Thu, Jun 07, 2007 at 11:36:07AM +0200]
| > |   Hi Cyrill!
| > | 
| > | On Wed 06-06-07 21:53:51, Cyrill Gorcunov wrote:
| > | > This patch prevents from deadlock on inode being dropped.
| > | > The deadlock is caused by inderect call of mark_inode_dirty()
| > | > within udf_drop_inode() but inode lock is already kept
| > | > by the kernel. So moving code from udf_drop_inode() to
| > | > udf_delete_inode() we save its functionality and avoid
| > | > deadlock.
| > |   The patch is wrong. You cannot truncate the extent just in delete_inode.
| > | That would lead to inodes with untruncated last extent on disk after
| > | unmounting, which is forbidden in the specification. You need to truncate
| > | the last extent whenever inode is being removed from memory or something
| > | like that... I'm already thinking how to do it and avoid calling
| > | mark_inode_dirty()...
| > | 
| > 
| > Arh, thanks... Jan, actually the reason I've moved the code into
| > 'delete' section was that I found no reasonable difference for our
| > case between 'drop' and 'delete'. Moreover, by seeing into VFS code
| > the only diff between 'drop' and 'delete' is that
| > inside generic_delete_inode() a few inode structure elements
| > are being destroyed and then our udf_drop_inode is called. So assuming,
| > that you're right in drop_inode I've code just moved to 'delete' section.
|   The difference is that udf_delete_inode() is called only when inode has
| i_nlink == 0 and thus it's being deleted on disk. udf_drop_inode() is
| called whenever inode is removed from memory which is what we want.
|   I'm already testing a patch which should fix the problem...
| 
| 								Honza
| -- 
| Jan Kara <[email protected]>
| SuSE CR Labs
| 

Thanks for eplanation, Jan

		Cyrill

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux