git: kernel - Try harder to unmount a filesystem

[Matthew Dillon]

commit fdbec6d31d4c1ab916476564bfcccfac093bfe0a
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Tue Feb 26 00:35:03 2013 -0800

    kernel - Try harder to unmount a filesystem
    
    * Use LK_TIMELOCK (5 seconds) instead of LK_NOWAIT when getting the mp
      lockmgr lock for unforced unmounts.
    
    * Remove the syncer vnode and issue VFS_SYNC prior to checking
      mnt_refs instead of after the check.  This appears to improve tmpfs's
      chances of unmounting, though it is a bit unclear as to why.
    
    * Wait up to 1 second for mnt_refs to drop to 1 before giving up.
    
    * Improves Poudriere's chances of successfully unmounting a tmpfs
      filesystem.

Summary of changes:
 sys/kern/vfs_mount.c    |  2 +-
 sys/kern/vfs_syscalls.c | 47 ++++++++++++++++++++++++++++++++++-------------
 2 files changed, 35 insertions(+), 14 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/fdbec6d31d4c1ab916476564bfcccfac093bfe0a


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