git: cluster - xdisk automatic BIO restart

[Matthew Dillon]

commit 5a78b06a5d4598d555a136c3ca9e9e124e46ef94
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Tue Dec 4 19:24:54 2012 -0800

    cluster - xdisk automatic BIO restart
    
    * The xdisk driver now detects failed transactions due to failed circuits
      and will restart the BIOs on another circuit or hold onto them until
      connectivity is restored and a new circuit is reforged.
    
      Automatic restarts only occur if the xa* disk is open()'d (i.e. mounted
      or being accessed by userland).  Kernel disk subsystem probes on attach
      will be failed normally and not stall on lost connectivity.
    
    * subr_diskiocom now reports the correct DMSG error code for failed BIOs
      instead of reporting a kernel error code.

Summary of changes:
 sys/dev/disk/xdisk/xdisk.c |   72 +++++++++++++++++++++++++++++++-------------
 sys/kern/subr_diskiocom.c  |    9 +++++-
 sys/sys/dmsg.h             |    1 +
 3 files changed, 60 insertions(+), 22 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/5a78b06a5d4598d555a136c3ca9e9e124e46ef94


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