md: fix some (more) errors with bitmaps on devices larger than 2TB.

If a write intent bitmap covers more than 2TB, we sometimes work with
values beyond 32bit, so these need to be sector_t.  This patches
add the required casts to some unsigned longs that are being shifted
up.

This will affect any raid10 larger than 2TB, or any raid1/4/5/6 with
member devices that are larger than 2TB.

Signed-off-by: NeilBrown <neilb@suse.de>
Reported-by: "Mario 'BitKoenig' Holbe" <Mario.Holbe@TU-Ilmenau.DE>
Cc: stable@kernel.org

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index bc1d64b..47c68bc 100644 (file)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1013,9 +1013,11 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
                kunmap_atomic(paddr, KM_USER0);
                if (b) {
                        /* if the disk bit is set, set the memory bit */
-                       bitmap_set_memory_bits(bitmap, i << CHUNK_BLOCK_SHIFT(bitmap),
-                                              ((i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) >= start)
-                               );
+                       int needed = ((sector_t)(i+1) << (CHUNK_BLOCK_SHIFT(bitmap))
+                                     >= start);
+                       bitmap_set_memory_bits(bitmap,
+                                              (sector_t)i << CHUNK_BLOCK_SHIFT(bitmap),
+                                              needed);
                        bit_cnt++;
                        set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN);
                }
@@ -1151,8 +1153,9 @@ void bitmap_daemon_work(struct bitmap *bitmap)
                        spin_lock_irqsave(&bitmap->lock, flags);
                        clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN);
                }
-               bmc = bitmap_get_counter(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap),
-                                       &blocks, 0);
+               bmc = bitmap_get_counter(bitmap,
+                                        (sector_t)j << CHUNK_BLOCK_SHIFT(bitmap),
+                                        &blocks, 0);
                if (bmc) {
 /*
   if (j < 100) printk("bitmap: j=%lu, *bmc = 0x%x\n", j, *bmc);
@@ -1166,7 +1169,8 @@ void bitmap_daemon_work(struct bitmap *bitmap)
                        } else if (*bmc == 1) {
                                /* we can clear the bit */
                                *bmc = 0;
-                               bitmap_count_page(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap),
+                               bitmap_count_page(bitmap,
+                                                 (sector_t)j << CHUNK_BLOCK_SHIFT(bitmap),
                                                  -1);
 
                                /* clear the bit */
@@ -1511,7 +1515,7 @@ void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
        unsigned long chunk;
 
        for (chunk = s; chunk <= e; chunk++) {
-               sector_t sec = chunk << CHUNK_BLOCK_SHIFT(bitmap);
+               sector_t sec = (sector_t)chunk << CHUNK_BLOCK_SHIFT(bitmap);
                bitmap_set_memory_bits(bitmap, sec, 1);
                bitmap_file_set_bit(bitmap, sec);
        }