diff options
| author | Shaohua Li <shli@kernel.org> | 2012-03-21 16:34:17 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-05-31 00:43:47 +0100 |
| commit | 07fb30fa5b317e65a6953471886b7fd04e1acb51 (patch) | |
| tree | 9da224d88791c3600b03aecc57fe2cd891602dd4 | |
| parent | ff741084d380bd234a4d0ffba0c19e8047a14658 (diff) | |
swap: don't do discard if no discard option added
commit 052b1987faca3606109d88d96bce124851f7c4c2 upstream.
When swapon() was not passed the SWAP_FLAG_DISCARD option, sys_swapon()
will still perform a discard operation. This can cause problems if
discard is slow or buggy.
Reverse the order of the check so that a discard operation is performed
only if the sys_swapon() caller is attempting to enable discard.
Signed-off-by: Shaohua Li <shli@fusionio.com>
Reported-by: Holger Kiehl <Holger.Kiehl@dwd.de>
Tested-by: Holger Kiehl <Holger.Kiehl@dwd.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | mm/swapfile.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 2015a1e42dc0..d3955f2745e5 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -2102,7 +2102,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) p->flags |= SWP_SOLIDSTATE; p->cluster_next = 1 + (random32() % p->highest_bit); } - if (discard_swap(p) == 0 && (swap_flags & SWAP_FLAG_DISCARD)) + if ((swap_flags & SWAP_FLAG_DISCARD) && discard_swap(p) == 0) p->flags |= SWP_DISCARDABLE; } |