The patch titled Subject: mm: frontswap: invalidate expired data on a dup-store failure has been removed from the -mm tree. Its filename was mm-frontswap-invalidate-expired-data-on-a-dup-store-failure.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Weijie Yang <weijie.yang@xxxxxxxxxxx> Subject: mm: frontswap: invalidate expired data on a dup-store failure 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@xxxxxxxxxxx> Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Cc: Seth Jennings <sjennings@xxxxxxxxxxxxxx> Cc: Dan Streetman <ddstreet@xxxxxxxx> Cc: Minchan Kim <minchan@xxxxxxxxxx> Cc: Bob Liu <bob.liu@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/frontswap.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff -puN mm/frontswap.c~mm-frontswap-invalidate-expired-data-on-a-dup-store-failure mm/frontswap.c --- a/mm/frontswap.c~mm-frontswap-invalidate-expired-data-on-a-dup-store-failure +++ a/mm/frontswap.c @@ -244,8 +244,10 @@ int __frontswap_store(struct page *page) the (older) page from frontswap */ inc_frontswap_failed_stores(); - if (dup) + if (dup) { __frontswap_clear(sis, offset); + frontswap_ops->invalidate_page(type, offset); + } } if (frontswap_writethrough_enabled) /* report failure so swap also writes to swap device */ _ Patches currently in -mm which might be from weijie.yang@xxxxxxxxxxx are origin.patch mm-page_isolation-check-pfn-validity-before-access.patch mm-mincore-add-hwpoison-page-handle.patch mm-mincore-add-hwpoison-page-handle-checkpatch-fixes.patch mm-zram-correct-zram_zero-flag-bit-position.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html