K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2019-10-18T03:38:02.590303Z
K 7
svn:log
V 449
MFC r353443

mountroot: run statfs after mounting devfs

The usual flow for mounting a file system is to VFS_MOUNT() and then
immediately VFS_STATFS().

That's not done in vfs_mountroot_devfs(), which means the
mp->mnt_stat.f_iosize field is not correctly populated, which in turn
causes us to mark valid aio operations as unsafe (because the io size is
set to 0), ultimately causing the aio_test:md_waitcomplete test to fail.

Sponsored by:	Axiado

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