Commit 1421ef3c authored Mar 22, 2011 by Cesar Eduardo Barros Committed by Linus Torvalds Mar 22, 2011

sys_swapon: call swap_cgroup_swapon() earlier



The call to swap_cgroup_swapon is in the middle of loading the swap map
and extents. As it only does memory allocation and does not depend on
the swapfile layout (map/extents), it can be called earlier (or later).

Move it to just after the allocation of swap_map, since it is
conceptually similar (allocates a map).

Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Tested-by: Eric B Munson <emunson@mgebm.net>
Acked-by: Eric B Munson <emunson@mgebm.net>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 38719025

mm/swapfile.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -2074,6 +2074,10 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
		goto bad_swap;
		}

		error = swap_cgroup_swapon(p->type, maxpages);
		if (error)
		goto bad_swap;

		nr_good_pages = maxpages - 1; /* omit header page */

		for (i = 0; i < swap_header->info.nr_badpages; i++) {
		@@ -2088,10 +2092,6 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
		}
		}

		error = swap_cgroup_swapon(p->type, maxpages);
		if (error)
		goto bad_swap;

		if (nr_good_pages) {
		swap_map[0] = SWAP_MAP_BAD;
		p->max = maxpages;