From: NeilBrown Date: Thu, 2 Feb 2006 22:28:03 +0000 (-0800) Subject: [PATCH] md: Fix device-size updates in md X-Git-Tag: v2.6.16-rc2~1^2~4 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6d89332b776fc11bac0073209e44ec8f39831e4e;p=linux-2.6 [PATCH] md: Fix device-size updates in md As 'array_size' is a 'sector_t', it may overflow inappropriately when shifted 10 bits. So We should cast it to a loff_t first. There are two places with this problem, but the second (in update_raid_disks) isn't needed so just remove it: The only personality that handles ->reshape currently is raid1, and it doesn't change the size of the array. When added for raid5/6, reshape again won't change the size of the array, at least not straight away. This code might be need for reshaping 'linear' but linear->shape, if implemented, should probably do the i_size_write itself. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/md/md.c b/drivers/md/md.c index 7145cd150f..9fac8ac496 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -3465,7 +3465,7 @@ static int update_size(mddev_t *mddev, unsigned long size) bdev = bdget_disk(mddev->gendisk, 0); if (bdev) { mutex_lock(&bdev->bd_inode->i_mutex); - i_size_write(bdev->bd_inode, mddev->array_size << 10); + i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10); mutex_unlock(&bdev->bd_inode->i_mutex); bdput(bdev); } @@ -3485,17 +3485,6 @@ static int update_raid_disks(mddev_t *mddev, int raid_disks) if (mddev->sync_thread) return -EBUSY; rv = mddev->pers->reshape(mddev, raid_disks); - if (!rv) { - struct block_device *bdev; - - bdev = bdget_disk(mddev->gendisk, 0); - if (bdev) { - mutex_lock(&bdev->bd_inode->i_mutex); - i_size_write(bdev->bd_inode, mddev->array_size << 10); - mutex_unlock(&bdev->bd_inode->i_mutex); - bdput(bdev); - } - } return rv; }