Commit 4e5ae838 authored Jun 05, 2007 by David Chinner Committed by Tim Shimmin Jul 14, 2007

[XFS] xfs_bmapi fails to update the previous extent pointer



When processing multiple extent maps, xfs_bmapi needs to keep track of the
extent behind the one it is currently working on to be able to trim extent
ranges correctly. Failing to update the previous pointer can result in
corrupted extent lists in memory and this will result in panics or assert
failures.

Update the previous pointer correctly when we move to the next extent to
process.

SGI-PV: 965631
SGI-Modid: xfs-linux-melb:xfs-kern:28773a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Vlad Apostolov <vapo@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

parent 210c6f1c

fs/xfs/xfs_bmap.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -5219,10 +5219,10 @@ xfs_bmapi(
		* Else go on to the next record.
		*/
		ep = xfs_iext_get_ext(ifp, ++lastx);
		if (lastx >= nextents) {
		eof = 1;
		prev = got;
		} else
		if (lastx >= nextents)
		eof = 1;
		else
		xfs_bmbt_get_all(ep, &got);
		}
		ifp->if_lastex = lastx;

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