Commit ce62003f authored Jul 24, 2014 by Liu Bo Committed by Chris Mason Aug 15, 2014

Btrfs: fix compressed write corruption on enospc



When failing to allocate space for the whole compressed extent, we'll
fallback to uncompressed IO, but we've forgotten to redirty the pages
which belong to this compressed extent, and these 'clean' pages will
simply skip 'submit' part and go to endio directly, at last we got data
corruption as we write nothing.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Tested-By: Martin Steigerwald <martin@lichtvoll.de>
Signed-off-by: Chris Mason <clm@fb.com>

parent f90e579c

fs/btrfs/inode.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -709,6 +709,18 @@ retry:
		unlock_extent(io_tree, async_extent->start,
		async_extent->start +
		async_extent->ram_size - 1);

		/*
		* we need to redirty the pages if we decide to
		* fallback to uncompressed IO, otherwise we
		* will not submit these pages down to lower
		* layers.
		*/
		extent_range_redirty_for_io(inode,
		async_extent->start,
		async_extent->start +
		async_extent->ram_size - 1);

		goto retry;
		}
		goto out_free;

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