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libvirt/tests
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Daniel P. Berrange eca72d4759 Introduce an internal API for handling file based lockspaces 
The previously introduced virFile{Lock,Unlock} APIs provide a
way to acquire/release fcntl() locks on individual files. For
unknown reason though, the POSIX spec says that fcntl() locks
are released when *any* file handle referring to the same path
is closed. In the following sequence

  threadA: fd1 = open("foo")
  threadB: fd2 = open("foo")
  threadA: virFileLock(fd1)
  threadB: virFileLock(fd2)
  threadB: close(fd2)

you'd expect threadA to come out holding a lock on 'foo', and
indeed it does hold a lock for a very short time. Unfortunately
when threadB does close(fd2) this releases the lock associated
with fd1. For the current libvirt use case for virFileLock -
pidfiles - this doesn't matter since the lock is acquired
at startup while single threaded an never released until
exit.

To provide a more generally useful API though, it is necessary
to introduce a slightly higher level abstraction, which is to
be referred to as a "lockspace".  This is to be provided by
a virLockSpacePtr object in src/util/virlockspace.{c,h}. The
core idea is that the lockspace keeps track of what files are
already open+locked. This means that when a 2nd thread comes
along and tries to acquire a lock, it doesn't end up opening
and closing a new FD. The lockspace just checks the current
list of held locks and immediately returns VIR_ERR_RESOURCE_BUSY.

NB, the API as it stands is designed on the basis that the
files being locked are not being otherwise opened and used
by the application code. One approach to using this API is to
acquire locks based on a hash of the filepath.

eg to lock /var/lib/libvirt/images/foo.img the application
might do

   virLockSpacePtr lockspace = virLockSpaceNew("/var/lib/libvirt/imagelocks");
   lockname = md5sum("/var/lib/libvirt/images/foo.img");
   virLockSpaceAcquireLock(lockspace, lockname);

NB, in this example, the caller should ensure that the path
is canonicalized before calculating the checksum.

It is also possible to do locks directly on resources by
using a NULL lockspace directory and then using the file
path as the lock name eg

   virLockSpacePtr lockspace = virLockSpaceNew(NULL);
   virLockSpaceAcquireLock(lockspace, "/var/lib/libvirt/images/foo.img");

This is only safe to do though if no other part of the process
will be opening the files. This will be the case when this
code is used inside the soon-to-be-reposted virlockd daemon

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2012-10-16 15:45:55 +01:00
..
capabilityschemadata Update xml schemas according to libvirt source 2012-08-02 14:36:23 -06:00
commanddata command: shell-quote when logging commands 2012-08-31 08:10:58 -07:00
confdata Change the default of mdns_adv to false 2012-03-27 09:54:49 -06:00
cputestdata Removed more AMD-specific features from cpu64-rhel* models 2012-03-09 14:36:31 +01:00
domainschemadata parallels: implement containers creation 2012-09-13 21:19:58 +08:00
domainsnapshotxml2xmlin snapshot: also support disks by path 2011-09-05 07:03:04 -06:00
domainsnapshotxml2xmlout qemu: Support numad 2012-03-15 12:24:56 +08:00
interfaceschemadata Update interface.rng and xml test files to match netcf 0.1.5 2010-01-19 21:13:03 +01:00
lxcxml2xmldata numad: Always output 'placement' of <vcpu> 2012-05-08 16:57:37 -06:00
networkxml2argvdata remove dnsmasq command line parameter "--filterwin2k" 2012-09-06 10:59:33 -06:00
networkxml2xmlin conf: parser/formatter/rng for <forward mode='hostdev'> 2012-08-17 15:43:26 -04:00
networkxml2xmlout conf: parser/formatter/rng for <forward mode='hostdev'> 2012-08-17 15:43:26 -04:00
nodedevschemadata Update xml schemas according to libvirt source 2012-08-02 14:36:23 -06:00
nodeinfodata tests: reduce length of nodeinfodata test names 2012-07-20 15:36:11 -06:00
nwfilterxml2xmlin nwfilter: Add support for ipset 2012-05-21 06:26:34 -04:00
nwfilterxml2xmlout nwfilter: Add support for ipset 2012-05-21 06:26:34 -04:00
qemuhelpdata tests: add qemu-1.2.0 help data 2012-09-18 15:43:28 +08:00
qemuxml2argvdata conf: add test for boot dev and order 2012-10-16 12:25:32 +02:00
qemuxml2xmloutdata Remove probing of CPU models when launching QEMU guests 2012-09-27 10:24:52 +01:00
qemuxmlnsdata xml: output memory unit for clarity 2012-03-07 18:24:43 -07:00
sexpr2xmldata numad: Always output 'placement' of <vcpu> 2012-05-08 16:57:37 -06:00
storagepoolxml2xmlin Update xml schemas according to libvirt source 2012-08-02 14:36:23 -06:00
storagepoolxml2xmlout Update xml schemas according to libvirt source 2012-08-02 14:36:23 -06:00
storagevolxml2xmlin Added timestamps to storage volumes 2012-08-02 17:14:17 -06:00
storagevolxml2xmlout Add a sheepdog backend for the storage driver 2012-07-18 20:08:27 +01:00
vmx2xmldata vmx: handle shared folders parsing 2012-07-21 20:15:02 +02:00
xencapsdata Add suspend info to Xen, LXC and UML hypervisor capabilities 2011-11-30 10:12:30 +00:00
xmconfigdata numad: Always output 'placement' of <vcpu> 2012-05-08 16:57:37 -06:00
xml2sexprdata Xen: Fix <clock> handling 2012-04-02 09:33:54 -06:00
xml2vmxdata vmx: handle shared folders formatting 2012-07-21 19:45:02 +02:00
.valgrind.supp tests: suppress more valgrind situations 2011-05-03 08:03:39 -06:00
capabilityschematest Make test suite output less verbose 2010-01-15 16:28:05 +00:00
commandhelper.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
commandtest.c tests: test previous commit 2012-09-24 17:04:46 -06:00
conftest.c tests: Lower stack usage below 4096 bytes 2011-04-30 19:59:52 +02:00
cpuset use virBitmap to store cpumask info. 2012-09-17 14:59:37 -04:00
cputest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
define-dev-segfault numad: Always output 'placement' of <vcpu> 2012-05-08 16:57:37 -06:00
domainschematest Add LXC XML files to schema test & fix problems this uncovers 2012-03-27 15:52:25 +01:00
domainsnapshotschematest Domain snapshot RNG and tests. 2010-05-20 13:50:03 -04:00
domainsnapshotxml2xmltest.c Cleanup for a return statement in source files 2012-03-26 14:45:22 -06:00
esxutilstest.c build: properly skip tests 2011-12-01 13:49:20 -07:00
eventtest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
int-overflow tests: Don't use bash if we don't have to 2011-07-29 17:17:21 +02:00
interfaceschematest Make test suite output less verbose 2010-01-15 16:28:05 +00:00
interfacexml2xmltest.c Cleanup for a return statement in source files 2012-03-26 14:45:22 -06:00
jsontest.c Add test case for parsing JSON docs 2011-06-30 18:04:02 +01:00
libvirtd-fail Fix up "make check" 2009-10-07 12:18:13 +02:00
libvirtd-pool Fix up "make check" 2009-10-07 12:18:13 +02:00
libvirtdconftest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
lxcxml2xmltest.c build: silence recent syntax check violations 2012-03-29 21:23:59 -06:00
Makefile.am Introduce an internal API for handling file based lockspaces 2012-10-16 15:45:55 +01:00
networkschematest Make test suite output less verbose 2010-01-15 16:28:05 +00:00
networkxml2argvtest.c test: fix segfault in networkxml2argvtest 2012-04-05 07:04:43 -04:00
networkxml2xmltest.c conf: parser/formatter/rng for <forward mode='hostdev'> 2012-08-17 15:43:26 -04:00
nodedevschematest Make test suite output less verbose 2010-01-15 16:28:05 +00:00
nodedevxml2xmltest.c Cleanup for a return statement in source files 2012-03-26 14:45:22 -06:00
nodeinfotest.c tests: reduce length of nodeinfodata test names 2012-07-20 15:36:11 -06:00
nwfilterschematest nwfilter: Add filter schema for nwfilter XML, extend domain XML schema 2010-04-06 11:09:46 -04:00
nwfilterxml2xmltest.c nwfilter: Add support for ipset 2012-05-21 06:26:34 -04:00
object-locking.ml maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
oomtrace.pl Remove tabs from all perl files & enforce this 2012-07-30 13:09:57 +01:00
openvzutilstest.c numad: Always output 'placement' of <vcpu> 2012-05-08 16:57:37 -06:00
openvzutilstest.conf openvz: Add simple test for openvzReadNetworkConf 2011-06-01 11:58:15 +02:00
pkix_asn1_tab.c Add a test case for certificate validation 2011-07-22 15:18:32 +01:00
qemuargv2xmltest.c tests: Add tests for dump-core option 2012-09-20 16:41:07 +02:00
qemuhelptest.c qemu: Fix QMP detection of QXL graphics 2012-10-09 11:42:05 +02:00
qemumonitorjsontest.c Add a qemuMonitorGetCommands() method for QMP query-commands command 2012-09-27 11:04:32 +01:00
qemumonitortest.c qemu: unescape HMP commands before converting them to json 2012-02-27 16:06:02 -07:00
qemumonitortestutils.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
qemumonitortestutils.h maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
qemuxml2argvtest.c conf: add test for boot dev and order 2012-10-16 12:25:32 +02:00
qemuxml2xmltest.c tests: Add tests for dump-core option 2012-09-20 16:41:07 +02:00
qemuxmlnstest.c Remove probing of machine types when canonicalizing XML 2012-09-27 10:24:52 +01:00
read-bufsiz maint: avoid regression on copyright listings 2012-07-27 07:42:34 -06:00
read-non-seekable maint: avoid regression on copyright listings 2012-07-27 07:42:34 -06:00
reconnect.c tests: avoid xend ABRT crash report 2011-11-18 15:00:18 -07:00
schematestutils.sh tests: fix schema checks sorting 2011-12-22 13:01:09 -07:00
seclabeltest.c virrandom: make virRandomInitialize an automatic one-shot 2012-08-06 08:15:13 -06:00
securityselinuxhelper.c selinux: Use raw contexts 2012-10-12 17:54:09 +02:00
securityselinuxtest.c selinux: Use raw contexts 2012-10-12 17:54:09 +02:00
sexpr2xmltest.c Convert public datatypes to inherit from virObject 2012-08-07 11:47:41 +01:00
shunloadhelper.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
shunloadtest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
sockettest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
ssh.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
start maint: avoid regression on copyright listings 2012-07-27 07:42:34 -06:00
statstest.c Cleanup for a return statement in source files 2012-03-26 14:45:22 -06:00
storagebackendsheepdogtest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
storagepoolschematest Make test suite output less verbose 2010-01-15 16:28:05 +00:00
storagepoolxml2xmltest.c Add a sheepdog backend for the storage driver 2012-07-18 20:08:27 +01:00
storagevolschematest Make test suite output less verbose 2010-01-15 16:28:05 +00:00
storagevolxml2xmltest.c Add a sheepdog backend for the storage driver 2012-07-18 20:08:27 +01:00
test_conf.sh Make test suite output less verbose 2010-01-15 16:28:05 +00:00
test-lib.sh tests: simplify formatting 2011-07-11 09:21:37 -06:00
testutils.c Change logging category parameter into an enum 2012-09-28 10:39:28 +01:00
testutils.h maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
testutilslxc.c Add support for setting init argv for LXC 2012-03-27 15:52:25 +01:00
testutilslxc.h Add support for setting init argv for LXC 2012-03-27 15:52:25 +01:00
testutilsqemu.c S390: Adding testcases for s390 2012-07-11 11:19:05 +02:00
testutilsqemu.h remove all trailing blank lines 2009-07-16 15:06:42 +02:00
testutilsxen.c Fix default console type setting 2011-11-03 12:01:48 +00:00
testutilsxen.h remove all trailing blank lines 2009-07-16 15:06:42 +02:00
utiltest.c build: avoid 'make syntax-check' failure 2011-07-01 16:46:20 -06:00
vcpupin maint: avoid regression on copyright listings 2012-07-27 07:42:34 -06:00
viratomictest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
virauthconfigtest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
virbitmaptest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
virbuftest.c buf: support peeking at string contents 2012-06-11 09:21:27 -06:00
virdrivermoduletest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
virhashdata.h Rename hash.h and hash.c to virhash.h and virhash.c 2012-01-26 14:11:13 +00:00
virhashtest.c Fix format specifiers in test cases on Win32 2012-04-04 14:33:27 +01:00
virkeyfiletest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
virlockspacetest.c Introduce an internal API for handling file based lockspaces 2012-10-16 15:45:55 +01:00
virnetmessagetest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
virnetsockettest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
virnettlscontexttest.c Various typos and misspellings 2012-10-12 00:03:43 +02:00
virsh-all Don't check the 'connect' command in virsh-all test 2012-08-07 11:59:08 +01:00
virsh-optparse maint: avoid regression on copyright listings 2012-07-27 07:42:34 -06:00
virsh-schedinfo maint: avoid regression on copyright listings 2012-07-27 07:42:34 -06:00
virsh-synopsis maint: avoid regression on copyright listings 2012-07-27 07:42:34 -06:00
virsh-undefine build: avoid confusing make with raw name 'undefine' 2012-09-12 11:27:22 -06:00
virshtest.c virsh: output scaled values with correct units 2012-05-01 14:58:14 -06:00
virt-aa-helper-test fix AppArmor driver for pipe character devices 2011-09-28 15:43:39 +08:00
virtimetest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
viruritest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
vmx2xmltest.c vmx: handle shared folders parsing 2012-07-21 20:15:02 +02:00
xencapstest.c Cleanup for a return statement in source files 2012-03-26 14:45:22 -06:00
xmconfigtest.c maint: fix up copyright notice inconsistencies 2012-09-20 16:30:55 -06:00
xml2sexprtest.c Cleanup for a return statement in source files 2012-03-26 14:45:22 -06:00
xml2vmxtest.c vmx: handle shared folders formatting 2012-07-21 19:45:02 +02:00