Symbol: zfs_umount
usr/src/uts/common/fs/zfs/zfs_vfsops.c
88
static int zfs_umount(vfs_t *vfsp, int fflag, cred_t *cr);
usr/src/uts/common/fs/zfs/zfs_vfsops.c
99
VFSNAME_UNMOUNT, { .vfs_unmount = zfs_umount },