vfs_mount.c: Don't call VFS_MOUNT() if only exports are being updatedHEADmain

PR#293198 reports a hang within ZFS when exports
are being updated concurrently with a VOP_SETEXTATTR().
The hang appears to be caused by mishandling of the
z_teardown_lock, but fixing handling of this lock appears
to be a major effort. Since the hang occurs when
VFS_MOUNT() acquires a write/exclusive z_teardown_lock,
which rarely occurs, except when exports are being updated,
this patch avoids the VFS_MOUNT() call for this case.

Avoiding a VFS_MOUNT() call fixes the hang for the case
reported by PR#293198 and is also an optimization.
As such, this patch avoids the VFS_MOUNT() call when only exports
are being updated similar to what was already being done
within vnet prisons.

PR:	293198
Reviewed by:	kib, markj
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D55318

0 files changed, 0 insertions, 0 deletions