libzfs: On FreeBSD, use MNT_NOWAIT with getfsstat

`getfsstat(2)` is used to retrieve the list of mounted file systems,
which libzfs uses when fetching properties like mountpoint, atime,
setuid, etc.  The `mode` parameter may be `MNT_NOWAIT`, which uses
information in the VFS's cache, or `MNT_WAIT`, which effectively does a
`statfs` on every single mounted file system in order to fetch the most
up-to-date information.  As far as I can tell, the only fields that
libzfs cares about are the filesystem's name, mountpoint, fstypename,
and mount flags.  Those things are always updated on mount and unmount,
so they will always be accurate in the VFS's mount cache except in two
circumstances:

1) When a file system is busy unmounting
2) When a ZFS file system changes the value of a mount-overridable
   property like atime or setuid, but doesn't remount the file system.
   Right now that only happens when the property is changed by an
   unprivileged user who has delegated authority to change the property
   but not to mount the dataset.  But perhaps libzfs could choose to do
   it for other reasons in the future.

Switching to `MNT_NOWAIT` will greatly improve speed with no downside,
as long as we explicitly update the mount cache whenever we change a
mount-overridable property.

For comparison, Illumos gets this information using the native
`getmntany` and `getmntent` functions, which also use cached
information.  The illumos function that would refresh the cache,
`resetmnttab`, is never called by libzfs.

And on GNU/Linux, `getmntany` and `getmntent` don't even communicate
with the kernel directly.  They simply parse the file they are given,
which is usually /etc/mtab or /proc/mounts.  Perhaps the implementation
of /proc/mounts is synchronous, ala MNT_WAIT; I don't know.

Sponsored-by:	Axcient
Reviewed-by: Ryan Moeller <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by:	Alan Somers <[email protected]>
Closes: #12091

1 files changed, 1 insertions, 0 deletions

diff --git a/include/sys/zfs_ioctl_impl.h b/include/sys/zfs_ioctl_impl.h
index 23262a35d..3db67ae98 100644
--- a/include/sys/zfs_ioctl_impl.h
+++ b/include/sys/zfs_ioctl_impl.h
@@ -82,6 +82,7 @@ void zfs_ioctl_register(const char *, zfs_ioc_t, zfs_ioc_func_t *,
     boolean_t, boolean_t, const zfs_ioc_key_t *, size_t);
 
 uint64_t zfs_max_nvlist_src_size_os(void);
+void zfs_ioctl_update_mount_cache(const char *dsname);
 void zfs_ioctl_init_os(void);
 
 boolean_t zfs_vfs_held(zfsvfs_t *);