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Message-ID: <46706140.6040502@redhat.com> Date: Wed, 13 Jun 2007 17:27:28 -0400 From: Chuck Ebbert <cebbert@...hat.com> To: Rich Coe <Richard.Coe@....ge.com> CC: torvalds@...l.org, jack@...e.cz, linux-kernel@...r.kernel.org Subject: Re: PATCH: udf fs corruption on linux-2.6 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. http://lkml.org/lkml/2007/6/11/79 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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