Commit 2d30d31e authored by Jerome Marchand's avatar Jerome Marchand Committed by Linus Torvalds

swap: redirty page if page write fails on swap file

Since commit 62c230bc ("mm: add support for a filesystem to activate
swap files and use direct_IO for writing swap pages"), swap_writepage()
calls direct_IO on swap files.  However, in that case the page isn't
redirtied if I/O fails, and is therefore handled afterwards as if it has
been successfully written to the swap file, leading to memory corruption
when the page is eventually swapped back in.

This patch sets the page dirty when direct_IO() fails.  It fixes a
memory corruption that happened while using swap-over-NFS.
Signed-off-by: default avatarJerome Marchand <jmarchan@redhat.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarMel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>	[3.6+]
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 465adcf1
......@@ -231,6 +231,8 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
if (ret == PAGE_SIZE) {
count_vm_event(PSWPOUT);
ret = 0;
} else {
set_page_dirty(page);
}
return ret;
}
......
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