[Bug 223015] [tmpfs] tmpfs does not support sparse files

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223015

Keith White <kwhite at site.uottawa.ca> changed:

           What    |Removed                     |Added
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 Attachment #187197|0                           |1
        is obsolete|                            |

--- Comment #6 from Keith White <kwhite at site.uottawa.ca> ---
Created attachment 187384
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=187384&action=edit
POC for using resident_page_count

This patch allows me to use large files with holes. e.g.

# mkdir /tmp/_x
# mount -t tmpfs -osize=10m tmp /tmp/_x
# truncate -s4g /tmp/_x/4g
# ls -ls /tmp/_x/4g
    0 -rw-r--r--  1 root  wheel  4294967296 Oct 22 19:51 /tmp/_x/4g
# df /tmp/_x
    Filesystem 1K-blocks Used Avail Capacity  Mounted on
    tmpfs          10240    4 10236     0%    /tmp/_x
# du /tmp/_x
    0       /tmp/_x
# umount /tmp/_x
# rmdir /tmp/_x

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