minixfs: fix block limit check

On minix2 and minix3 usually max_size is 7fffffff and the check in
question prohibits creation of last block spanning right before 7fffffff,
due to downward rounding during the division.  Fix it by using
multiplication instead.

[akpm@linux-foundation.org: fix up code layout, use local `sb']
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/minix/itree_v2.c b/fs/minix/itree_v2.c
index 13487ad16894..78e2d93e5c83 100644
--- a/fs/minix/itree_v2.c
+++ b/fs/minix/itree_v2.c
@@ -32,7 +32,8 @@ static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
         if (block < 0) {
                 printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
                         block, bdevname(sb->s_bdev, b));
-        } else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) {
+        } else if ((u64)block * (u64)sb->s_blocksize >=
+                        minix_sb(sb)->s_max_size) {
                 if (printk_ratelimit())
                         printk("MINIX-fs: block_to_path: "
                                "block %ld too big on dev %s\n",