Re: PATCH: udf fs corruption on linux-2.6

From: Chuck Ebbert
Date: Wed Jun 13 2007 - 17:27:49 EST

On 06/13/2007 04:48 PM, Rich Coe wrote:
> Hi Linus,
> This patch fixes directory and missing files corruption in fs/udf which
> occurs on all known 2.6 releases.
> The corruption occurs because blocks which were pre-alloc'd for a directory
> are released back to the fs freelist, but the inode's alloc block information
> is not updated to reflect this.
> You would not see corruption if the number of files in any directory is
> less than 41, because the pre-alloc routine does not allocate blocks for the
> directory until the number of files is over 40.
> The problem occurs during unmounting because fs/udf incorrectly calls
> udf_discard_prealloc() from udf_clear_inode(). udf_discard_prealloc() will
> update the inode and schedule it for write, but no write will ever occur
> because the fs is in the process of being umount'd.
> The solution is to add a put_inode routine to update the inode contents
> and release the pre-alloc'd blocks to disk prior to clearing the inode
> from the kernel.

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