tree 192edd3a85d3665bb7e44c429609a7357ba12bac
parent ca5f9703dffa012cc46166e6206c5a992910e041
author Peter Zijlstra <a.p.zijlstra@chello.nl> 1159252286 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1159285728 -0700

[PATCH] mm: swap write failure fixup

Currently we can silently drop data if the write to swap failed.  It
usually doesn't result in data-corruption because on page-in the process
will receive SIGBUS (assuming write-failure implies read-failure).

This assumption might or might not be valid.

This patch will avoid the page being discarded after a failed write.  But
will print a warning the sysadmin _should_ take to heart, if a lot of swap
space becomes un-writeable, OOM is not far off.

Tested by making the write fail 'randomly' once every 50 writes or so.

[akpm@osdl.org: printk warning fix]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>