[issue10812] Add some posix functions

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

According to the posix_fallocate() man page under OpenSolaris:

     EINVAL    The len argument is less than or equal to zero, or
               the  offset  argument  is  less  than zero, or the
               underlying  file  system  does  not  support  this
               operation.

I would go for the third (last) interpretation: the filesystem (ZFS here) doesn't support it.

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