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[Qemu-block] [PATCH v2 0/4] scsi, block: introduce persistent reservatio
From: |
Paolo Bonzini |
Subject: |
[Qemu-block] [PATCH v2 0/4] scsi, block: introduce persistent reservation managers |
Date: |
Tue, 19 Sep 2017 12:24:30 +0200 |
SCSI persistent Reservations allow restricting access to block devices
to specific initiators in a shared storage setup. When implementing
clustering of virtual machines, it is a common requirement for virtual
machines to send persistent reservation SCSI commands. However,
the operating system restricts sending these commands to unprivileged
programs because incorrect usage can disrupt regular operation of the
storage fabric.
With these patches, the scsi-block and scsi-generic SCSI passthrough
devices learn to delegate the implementation of persistent reservations to
a separate object, the "persistent reservation manager". The persistent
reservation manager talks to a separate privileged program, with a very
simple protocol based on SCM_RIGHTS. In addition to invoking PERSISTENT
RESERVATION OUT and PERSISTENT RESERVATION IN commands, the privileged
component can also use libmpathpersist so that persistent reservations
are applied to all paths in a multipath setting.
Patch 1 defines the abstract QOM class and plugs it into block/file-posix.c.
Patch 2 and 3 introduce the privileged helper program, while patch 4
defines the concrete QOM class that talks to it.
Paolo
v1->v2: removed scsi/ patches which were all reviewed
removed man page (requires .texi while I used .rst for docs)
qio_channel_read/write_all also went in independently
fix installation of qemu-pr-helper man page
fixes to documentation
added BSD license to protocol header
added handling of residual (buffer underrun)
fixed closing of file descriptors on error
block PERSISTENT RESERVE OUT for read-only file descriptors
do not use g_assert
use EXIT_SUCCESS/EXIT_FAILURE consistently
moved all CONFIG_MPATH usage to the right patch
drop CAP_SYS_ADMIN if multipath not compiled in
simplify buffer size handling in multipath PERSISTENT RESERVE IN
block REGISTER AND MOVE operation for multipath PERSISTENT RESERVE OUT
fixed transport id handling in multipath PERSISTENT RESERVE OUT
fixed string property double-free in pr-manager-helper
fixed/cleaned up error handling in pr-manager-helper
Paolo Bonzini (9):
scsi, file-posix: add support for persistent reservation management
scsi: build qemu-pr-helper
scsi: add multipath support to qemu-pr-helper
scsi: add persistent reservation manager using qemu-pr-helper
Makefile | 14 +-
configure | 59 ++-
docs/interop/pr-helper.rst | 83 ++++
docs/pr-manager.rst | 60 +++
include/scsi/utils.h | 4 +
scsi/Makefile.objs | 2 +-
scsi/pr-helper.h | 41 ++
scsi/pr-manager-helper.c | 302 +++++++++++++
scsi/qemu-pr-helper.c | 1038 ++++++++++++++++++++++++++++++++++++++++++++
scsi/utils.c | 10 +
10 files changed, 1607 insertions(+), 6 deletions(-)
--
2.13.5
- [Qemu-block] [PATCH v2 0/4] scsi, block: introduce persistent reservation managers,
Paolo Bonzini <=