git: hammer2 hammer2 - Config notifications, cleanup HAMMER2 VFS API
dillon at crater.dragonflybsd.org
Fri Aug 10 20:56:35 PDT 2012
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date: Fri Aug 10 20:46:51 2012 -0700
hammer2 - Config notifications, cleanup HAMMER2 VFS API
* A hammer2 volume has a PERSISTENT table of 256 entries in the media
volume header for specifying how the cluster connects together. Various
hammer2 directives can list, add, or remove entries from this table.
This table will be used for several different aspects of the filesystem
and one of them is to tell the userland hammer2 service daemon what
other machines to connect to. That is, we want the cluster configuration
to be persistently stored as part of a HAMMER2 filesystem.
* Add a notification message from the kernel to the daemon whenever this
table id modified. The kernel will also spam the contents of the table
to the daemon when it first connects to the daemon.
The service daemon tracks the table and will connect to (or disconnect
from) the listed targets in real time. In addition, the service daemon
will retry a failed connection (or failed DNS lookup) forever as long
as the entry is intact. The idea being that a machine in the cluster
will recover once transitory failures are resolved.
This is a bit messy at the moment as two pthreads have to be created for
each connection... one to handle connect, disconnect, and retry operations
and the other to handle the actual message stream over the connection.
* Clean up the HAMMER2 VFS code's messaging APIs a bit, bringing them
closer to the hammer2 userland APIs (though of course there will
always be major differences).
* Adjust the hammer2 VFS to try to clean up open transactional states
when a socket failure occurs before proceeding with a umount, so the
related functional states can be triggered and cleaned up.
* Added an ioctl to reconnect a hammer2 mount to the userland hammer2
service daemon (not yet used). This will allow us to kill and restart
the daemon and have it recover the communications pipes between itself
and the HAMMER2 mounts in the kernel.
Summary of changes:
sbin/hammer2/cmd_remote.c | 2 +-
sbin/hammer2/msg.c | 3 +
sbin/hammer2/msg_lnk.c | 261 +++++++++++++++++++++++++++++++++----
sbin/hammer2/network.h | 10 +-
sys/vfs/hammer2/hammer2.h | 18 ++-
sys/vfs/hammer2/hammer2_ioctl.c | 37 +++++-
sys/vfs/hammer2/hammer2_ioctl.h | 10 ++-
sys/vfs/hammer2/hammer2_msg.c | 78 ++++++-----
sys/vfs/hammer2/hammer2_network.h | 33 ++++-
sys/vfs/hammer2/hammer2_vfsops.c | 151 ++++++++++++++++++++--
10 files changed, 511 insertions(+), 92 deletions(-)
DragonFly BSD source repository
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