https://github.com/torvalds/linux
Revision fb993fa1a2f669215fa03a09eed7848f2663e336 authored by Weijie Yang on 02 December 2014, 23:59:25 UTC, committed by Linus Torvalds on 03 December 2014, 01:32:07 UTC
If a frontswap dup-store failed, it should invalidate the expired page in the backend, or it could trigger some data corruption issue. Such as: 1. use zswap as the frontswap backend with writeback feature 2. store a swap page(version_1) to entry A, success 3. dup-store a newer page(version_2) to the same entry A, fail 4. use __swap_writepage() write version_2 page to swapfile, success 5. zswap do shrink, writeback version_1 page to swapfile 6. version_2 page is overwrited by version_1, data corrupt. This patch fixes this issue by invalidating expired data immediately when meet a dup-store failure. Signed-off-by: Weijie Yang <weijie.yang@samsung.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Seth Jennings <sjennings@variantweb.net> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Bob Liu <bob.liu@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent bc127bd
Tip revision: fb993fa1a2f669215fa03a09eed7848f2663e336 authored by Weijie Yang on 02 December 2014, 23:59:25 UTC
mm: frontswap: invalidate expired data on a dup-store failure
mm: frontswap: invalidate expired data on a dup-store failure
Tip revision: fb993fa
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