[PATCH 29/45] block: initialize struct block_device in bdev_alloc

[Christoph Hellwig <hch@xxxxxx>]

Don't play tricks with slab constructors as bdev structures tends to not
get reused very much, and this makes the code a lot less error prone.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 fs/block_dev.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 43a0fda982c879..1e5c6d0eb92677 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -784,20 +784,11 @@ static void bdev_free_inode(struct inode *inode)
        kmem_cache_free(bdev_cachep, BDEV_I(inode));
 }
 
-static void init_once(void *foo)
+static void init_once(void *data)
 {
-       struct bdev_inode *ei = (struct bdev_inode *) foo;
-       struct block_device *bdev = &ei->bdev;
+       struct bdev_inode *ei = data;
 
-       memset(bdev, 0, sizeof(*bdev));
-       mutex_init(&bdev->bd_mutex);
-#ifdef CONFIG_SYSFS
-       INIT_LIST_HEAD(&bdev->bd_holder_disks);
-#endif
-       bdev->bd_bdi = &noop_backing_dev_info;
        inode_init_once(&ei->vfs_inode);
-       /* Initialize mutex for freeze. */
-       mutex_init(&bdev->bd_fsfreeze_mutex);
 }
 
 static void bdev_evict_inode(struct inode *inode)
@@ -872,12 +863,17 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 
partno)
        inode->i_data.a_ops = &def_blk_aops;
 
        bdev = I_BDEV(inode);
+       memset(bdev, 0, sizeof(*bdev));
+       mutex_init(&bdev->bd_mutex);
+       mutex_init(&bdev->bd_fsfreeze_mutex);
        spin_lock_init(&bdev->bd_size_lock);
        bdev->bd_disk = disk;
        bdev->bd_partno = partno;
-       bdev->bd_super = NULL;
        bdev->bd_inode = inode;
-       bdev->bd_part_count = 0;
+       bdev->bd_bdi = &noop_backing_dev_info;
+#ifdef CONFIG_SYSFS
+       INIT_LIST_HEAD(&bdev->bd_holder_disks);
+#endif
        return bdev;
 }
 
-- 
2.29.2