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authorHugh Dickins <hugh@veritas.com>2009-01-06 14:39:56 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-06 15:59:06 -0800
commit858a29900ea2d639759e697be901a60b759cdcfb (patch)
tree2a75b37a5bb5522c33d47356354866d0b3e8bb40
parentc60aa176c6de82703f064082b909496fc4fee956 (diff)
swapfile: change discard pgoff_t to sector_t
Change pgoff_t nr_blocks in discard_swap() and discard_swap_cluster() to sector_t: given the constraints on swap offsets (in particular, the 5 bits of swap type accommodated in the same unsigned long), pgoff_t was actually safe as is, but it certainly looked worrying when shifted left. [akpm@linux-foundation.org: fix shift overflow] Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Matthew Wilcox <matthew@wil.cx> Cc: Joern Engel <joern@logfs.org> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Donjun Shin <djshin90@gmail.com> Cc: Tejun Heo <teheo@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/swapfile.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 763210732b5..6a078557306 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -96,7 +96,7 @@ static int discard_swap(struct swap_info_struct *si)
list_for_each_entry(se, &si->extent_list, list) {
sector_t start_block = se->start_block << (PAGE_SHIFT - 9);
- pgoff_t nr_blocks = se->nr_pages << (PAGE_SHIFT - 9);
+ sector_t nr_blocks = (sector_t)se->nr_pages << (PAGE_SHIFT - 9);
if (se->start_page == 0) {
/* Do not discard the swap header page! */
@@ -133,7 +133,7 @@ static void discard_swap_cluster(struct swap_info_struct *si,
start_page < se->start_page + se->nr_pages) {
pgoff_t offset = start_page - se->start_page;
sector_t start_block = se->start_block + offset;
- pgoff_t nr_blocks = se->nr_pages - offset;
+ sector_t nr_blocks = se->nr_pages - offset;
if (nr_blocks > nr_pages)
nr_blocks = nr_pages;