From db305e507d554430a69ede901a6308e6ecb72349 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Thu, 7 May 2009 12:49:06 +1000 Subject: 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 Reported-by: "Mario 'BitKoenig' Holbe" Cc: stable@kernel.org --- drivers/md/bitmap.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index bc1d64b7b63..47c68bc75a1 100644 --- 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); } -- cgit v1.2.3