Commit Graph

14 Commits

Author SHA1 Message Date
Sepherosa Ziehau
bedddda00f hyperv/vss: Nuke unused variables.
Submitted by:	markj
Reported by:	markj
MFC after:	3 weeks
Sponsored by:	Microsoft
2016-11-17 03:00:56 +00:00
Sepherosa Ziehau
168fce73b5 hyperv/vss: Add driver and tools for VSS
VSS stands for "Volume Shadow Copy Service".  Unlike virtual machine
snapshot, it only takes snapshot for the virtual disks, so both
filesystem and applications have to aware of it, and cooperate the
whole VSS process.

This driver exposes two device files to the userland:

    /dev/hv_fsvss_dev

    Normally userland programs should _not_ mess with this device file.
    It is currently used by the hv_vss_daemon(8), which freezes and
    thaws the filesystem.  NOTE: currently only UFS is supported, if
    the system mounts _any_ other filesystems, the hv_vss_daemon(8)
    will veto the VSS process.

    If hv_vss_daemon(8) was disabled, then this device file must be
    opened, and proper ioctls must be issued to keep the VSS working.

    /dev/hv_appvss_dev

    Userland application can opened this device file to receive the
    VSS freeze notification, hold the VSS for a while (mainly to flush
    application data to filesystem), release the VSS process, and
    receive the VSS thaw notification i.e. applications can run again.

    The VSS will still work, even if this device file is not opened.
    However, only filesystem consistency is promised, if this device
    file is not opened or is not operated properly.

hv_vss_daemon(8) is started by devd(8) by default.  It can be disabled
by editting /etc/devd/hyperv.conf.

Submitted by:	Hongjiang Zhang <honzhan microsoft com>
Reviewed by:	kib, mckusick
MFC after:	3 weeks
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8224
2016-11-15 02:36:12 +00:00
Sepherosa Ziehau
30c90f019f hyperv/kvp: Don't mix message status codes and function return values.
While I'm here, move message status codes to hv_utilreg.h, since they
will be used by the upcoming VSS stuffs.

Submitted by:	Hongjiang Zhang <honzhan microsoft com>
MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8391
2016-11-02 07:18:27 +00:00
Sepherosa Ziehau
868a59a7e2 hyperv/kvp_daemon: Make poll(2) block indefinitely
Submitted by:	Jun Su <junsu microsoft com>
Reviewed by:	Dexuan Cui <decui microsoft com>, me, adrain
Approved by:	adrian
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D4762
2016-01-11 03:30:16 +00:00
Pedro F. Giffuni
6460ee789a Appease gcc-4.2
It needs to die, but it resists mipsteriously.

Submitted by:	Oliver Pinter
2015-08-20 21:49:59 +00:00
Xin LI
2582ba5ec3 Test errno against EEXIST as well.
MFC after:	3 days
2014-11-11 16:49:33 +00:00
Xin LI
a31070e90d Rename variable name from 'index' to 'idx' to avoid shadowing index(3).
Noticed by:	dim
MFC after:	2 weeks
2014-11-11 05:49:57 +00:00
Xin LI
1545452c54 Remove an extra copy of hv_kvp_daemon(8) [1].
While I'm there also correct typos in OptionalObsoleteFiles and add
information of the command line options for hv_kvp_daemon(8).

Reported by:	jmg [1]
Reviewed by:	jmg
MFC after:	2 weeks
2014-10-27 21:29:42 +00:00
Xin LI
97d15a9372 Use a char * as iterator over a bounded string.
MFC after:	1 week
2014-09-25 22:22:57 +00:00
Xin LI
a6733ed126 Use strlcpy(). I don't believe these are real problems but it's better
to use a safe idiom.

Reported by:	Coverity
CID:		1238914
MFC after:	1 week
2014-09-25 22:22:54 +00:00
Xin LI
a2cf0c3c61 Refactor the code a little bit to avoid NULL deference when
allocation was failed.

Reported by:	Coverity
CID:		1238915
MFC after:	1 week
2014-09-25 22:22:51 +00:00
Xin LI
0a8534f083 Plug a file descriptor leak.
Reported by:	Coverity
CID:		1238916
MFC after:	1 week
2014-09-25 22:22:48 +00:00
Xin LI
be930504be Being able to access a path do not necessarily mean we have access
to a directory. So instead of doing this, we just call mkdir(2)
directly and test if the returned value is 0 or errno is EISDIR.

Reported by:	Coverity
CID:		1238925
MFC after:	1 week
2014-09-25 22:22:43 +00:00
Xin LI
e72055b7fe Import HyperV Key-Value Pair (KVP) driver and daemon code by Microsoft,
many thanks for their continued support of FreeBSD.

While I'm there, also implement a new build knob, WITHOUT_HYPERV to
disable building and installing of the HyperV utilities when necessary.

The HyperV utilities are only built for i386 and amd64 targets.

This is a stable/10 candidate for inclusion with 10.1-RELEASE.

Submitted by:	Wei Hu <weh microsoft com>
MFC after:	1 week
2014-09-13 02:15:31 +00:00