[Bug 14354] Bad corruption with 2.6.32-rc1 and upwards

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http://bugzilla.kernel.org/show_bug.cgi?id=14354





--- Comment #162 from Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>  2009-10-31 15:26:01 ---
On Sat, Oct 31, 2009 at 05:15:28AM -0400, Theodore Tso wrote:
> On Fri, Oct 30, 2009 at 01:56:27PM -0600, Andreas Dilger wrote:
> > I wonder if there are multiple problems involved here?  Eric, it seems
> > possible that your reproducer is exercising a similar, though unrelated
> > codepath.  
> 
> Note that Aneesh has pubished two patches which insert a call to
> ext4_discard_preallocations().  One is a patch which inserts it into
> fs/inode.c's truncate path (for direct/indirect-mapped inodes) and one
> which is patch which inserts it into fs/extents.c truncate path (for
> extent-mapped inodes).  As near as I can tell both patches are
> necessary, and it looks to me like they should be combined into a
> single patch, since commit 487caeef9 affects both truncate paths.
> Aneesh, do you concur?
> 

We need only the patch that drop prealloc space in ext4_truncate_restart_trans
ext4_ext_truncate_extend_restart calls ext4_truncate_restart_trans. So adding
the prealloc space dropping in ext4_truncate_restart_trans should handle both
direct/indirect-mapped inode and extent-mapped inodes.

-aneesh

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