Samba llseek bug

[David Howells]

Note that whilst testing my cifs fixes with the generic/075 and generic/112
xfstests, the tests occasionally hit a bug in Samba whereby llseek() fails
because there are too many extents in the server file for the server to
report.  I've noted this before:

	https://lore.kernel.org/linux-cifs/349671.1716335639@warthog.procyon.org.uk/

is there a fix for this I can try?

David