btrfs: remove folio order ASSERT()s in super block writeback path

[BUG]
There is a syzbot report that the ASSERT() inside write_dev_supers() got
triggered:

  assertion failed: folio_order(folio) == 0, in fs/btrfs/disk-io.c:3858
  ------------[ cut here ]------------
  kernel BUG at fs/btrfs/disk-io.c:3858!
  Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
  CPU: 0 UID: 0 PID: 6730 Comm: syz-executor378 Not tainted 6.14.0-syzkaller-03565-gf6e0150b2003 #0 PREEMPT(full)
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
  RIP: 0010:write_dev_supers fs/btrfs/disk-io.c:3858 [inline]
  RIP: 0010:write_all_supers+0x400f/0x4090 fs/btrfs/disk-io.c:4155
  Call Trace:
   <TASK>
   btrfs_commit_transaction+0x1eda/0x3750 fs/btrfs/transaction.c:2528
   btrfs_quota_enable+0xfcc/0x21a0 fs/btrfs/qgroup.c:1226
   btrfs_ioctl_quota_ctl+0x144/0x1c0 fs/btrfs/ioctl.c:3677
   vfs_ioctl fs/ioctl.c:51 [inline]
   __do_sys_ioctl fs/ioctl.c:906 [inline]
   __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f
  RIP: 0033:0x7f5ad1f20289
   </TASK>
  ---[ end trace 0000000000000000 ]---

[CAUSE]
Since commit f93ee0d ("btrfs: convert super block writes to folio
in write_dev_supers()") and commit c94b734 ("btrfs: convert super
block writes to folio in wait_dev_supers()"), the super block writeback
path is converted to use folio.

Since the original code is using page based interfaces, we have an
"ASSERT(folio_order(folio) == 0);" added to make sure everything is not
changed.

But the folio here is not from any btrfs inode, but from the block
device, and we have no control on the folio order in bdev, the device
can choose whatever folio size they want/need.

E.g. the bdev may even have a block size of multiple pages.

So the ASSERT() is triggered.

[FIX]
The super block writeback path has taken larger folios into
consideration, so there is no need for the ASSERT().

And since commit bc00965 ("btrfs: count super block write errors in
device instead of tracking folio error state"), the wait path no longer
checks the folio status but only wait for the folio writeback to finish,
there is nothing requiring the ASSERT() either.

So we can remove both ASSERT()s safely now.

Reported-by: syzbot+34122898a11ab689518a@syzkaller.appspotmail.com
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -3853,7 +3853,6 @@ static int write_dev_supers(struct btrfs_device *device,
 			atomic_inc(&device->sb_write_errors);
 			continue;
 		}
-		ASSERT(folio_order(folio) == 0);
 
 		offset = offset_in_folio(folio, bytenr);
 		disk_super = folio_address(folio) + offset;
@@ -3926,7 +3925,6 @@ static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
 		/* If the folio has been removed, then we know it completed. */
 		if (IS_ERR(folio))
 			continue;
-		ASSERT(folio_order(folio) == 0);
 
 		/* Folio will be unlocked once the write completes. */
 		folio_wait_locked(folio);