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authorNeilBrown <neilb@suse.de>2006-02-02 14:28:03 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-02 15:07:10 -0800
commit6d89332b776fc11bac0073209e44ec8f39831e4e (patch)
treee3e3b1917a08f2cdfa8ff9acc804a7b7ef1a6e3d /drivers/md
parentcf41f8ac386e8d62122e7e394b4c6b3e3ab30ede (diff)
[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 <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/md.c13
1 files changed, 1 insertions, 12 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 7145cd150f7b..9fac8ac496c5 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;
}