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Date: Mon, 18 Jul 2011 14:04:44 +1000 From: Dave Chinner <david@...morbit.com> To: linux-fsdevel@...r.kernel.org Cc: linux-kernel@...r.kernel.org, xfs@....sgi.com Subject: [PATCH 2/2] xfs: fix splice/direct-IO deadlock From: Dave Chinner <dchinner@...hat.com> lockdep reports splice vs direct-io write lock inversions due to generic_file_splice_write() taking the inode->i_mutex inside XFS_IOLOCK_EXCL context. These lock contexts are inverted, hence can deadlock. Use generic_file_splice_write_unlocked() because the i_mutex does not need to be held over the operations that are done in the XFS splice write path. Signed-off-by: Dave Chinner <dchinner@...hat.com> --- fs/xfs/linux-2.6/xfs_file.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c index f51a384..1e641e6 100644 --- a/fs/xfs/linux-2.6/xfs_file.c +++ b/fs/xfs/linux-2.6/xfs_file.c @@ -463,7 +463,8 @@ xfs_file_splice_write( trace_xfs_file_splice_write(ip, count, *ppos, ioflags); - ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags); + ret = generic_file_splice_write_unlocked(pipe, outfilp, ppos, + count, flags); xfs_aio_write_isize_update(inode, ppos, ret); xfs_aio_write_newsize_update(ip); -- 1.7.5.1 -- 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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