tmpfs - Fix arbitrary maximum file size limitation
* tmpfs's maxfilesize was limited to the original tmpfs mount
storage limit, prior to argument overrides. In addition,
the -f argument override would not increase the maxfilesize
limit beyond the original storage limit anyway.
* Remove this limit calculation entirely. Instead the limit
is based on the storage limit which can be optioned at mount
time.
* Fixes expectations when tmpfs is used to hold just a few (or
even just one) file.
Reported-by: kerma