fs: Get proper reference for s_bdi
So far we just relied on block device to hold a bdi reference for us
while the filesystem is mounted. While that works perfectly fine, it is
a bit awkward that we have a pointer to a refcounted structure in the
superblock without proper reference. So make s_bdi hold a proper
reference to block device's BDI. No filesystem using mount_bdev()
actually changes s_bdi so this is safe and will make bdev filesystems
work the same way as filesystems needing to set up their private bdi.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fs/super.c b/fs/super.c
index 0f51a43..e267d3a 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1054,12 +1054,9 @@ static int set_bdev_super(struct super_block *s, void *data)
{
s->s_bdev = data;
s->s_dev = s->s_bdev->bd_dev;
+ s->s_bdi = bdi_get(s->s_bdev->bd_bdi);
+ s->s_iflags |= SB_I_DYNBDI;
- /*
- * We set the bdi here to the queue backing, file systems can
- * overwrite this in ->fill_super()
- */
- s->s_bdi = bdev_get_queue(s->s_bdev)->backing_dev_info;
return 0;
}
