git: sys/vfs/hammer: Don't reblock when volume to delete is empty

[Tomohiro Kusumi]

commit 1e94cea68de46fe62ada9e33cbf25441c2329200
Author: Tomohiro Kusumi <kusumi.tomohiro at gmail.com>
Date:   Tue Aug 4 05:39:14 2015 +0900

    sys/vfs/hammer: Don't reblock when volume to delete is empty
    
    hammer_ioc_volume_del() needs to reblock filesystem only
    when the volume hammer volume-del is trying to remove is
    not empty. If it's empty (means the volume's blockmap has
    nothing other than layer2 big-block in non-root volume)
    it can be removed right away.
    
    The way it always reblocks on hammer volume-del is also
    counter intuitive since not everyone expects this command
    to do extra effort to delete it when it's not empty, and
    force one to wait for reblock to finish.

Summary of changes:
 sbin/hammer/hammer.8           |  4 ++
 sys/vfs/hammer/hammer_volume.c | 88 +++++++++++++++++++++++++++++-------------
 2 files changed, 66 insertions(+), 26 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/1e94cea68de46fe62ada9e33cbf25441c2329200


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