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qemu: allow simple domain save to use fd: protocol

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This allows direct saves (no compression, no root-squash NFS) to use
the more efficient fd: migration, which in turn avoids a race where
qemu exec: migration can sometimes fail because qemu does a generic
waitpid() that conflicts with the pclose() used by exec:.  Further
patches will solve compression and root-squash NFS.

* src/qemu/qemu_driver.c (qemudDomainSaveFlag): Use new function
when there is no compression.
This commit is contained in:
Eric Blake 2011-03-01 21:59:25 -07:00
parent d51023d4c2
commit 9497506fa0
1 changed files with 23 additions and 3 deletions
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26
src/qemu/qemu_driver.c
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@ -1823,6 +1823,7 @@ static int qemudDomainSaveFlag(struct qemud_driver *driver, virDomainPtr dom,
int is_reg = 0;
unsigned long long offset;
virCgroupPtr cgroup = NULL;
virBitmapPtr qemuCaps = NULL;
memset(&header, 0, sizeof(header));
memcpy(header.magic, QEMUD_SAVE_MAGIC, sizeof(header.magic));
@ -1853,6 +1854,11 @@ static int qemudDomainSaveFlag(struct qemud_driver *driver, virDomainPtr dom,
}
}
if (qemuCapsExtractVersionInfo(vm->def->emulator, vm->def->os.arch,
NULL,
&qemuCaps) < 0)
goto endjob;
/* Get XML for the domain */
xml = virDomainDefFormat(vm->def, VIR_DOMAIN_XML_SECURE);
if (!xml) {
@ -2013,10 +2019,23 @@ static int qemudDomainSaveFlag(struct qemud_driver *driver, virDomainPtr dom,
if (header.compressed == QEMUD_SAVE_FORMAT_RAW) {
const char *args[] = { "cat", NULL };
/* XXX gross - why don't we reuse the fd already opened earlier */
int fd = -1;
if (qemuCapsGet(qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD) &&
priv->monConfig->type == VIR_DOMAIN_CHR_TYPE_UNIX)
fd = open(path, O_WRONLY);
qemuDomainObjEnterMonitorWithDriver(driver, vm);
rc = qemuMonitorMigrateToFile(priv->mon,
QEMU_MONITOR_MIGRATE_BACKGROUND,
args, path, offset);
if (fd >= 0 && lseek(fd, offset, SEEK_SET) == offset) {
rc = qemuMonitorMigrateToFd(priv->mon,
QEMU_MONITOR_MIGRATE_BACKGROUND,
fd);
} else {
rc = qemuMonitorMigrateToFile(priv->mon,
QEMU_MONITOR_MIGRATE_BACKGROUND,
args, path, offset);
}
VIR_FORCE_CLOSE(fd);
qemuDomainObjExitMonitorWithDriver(driver, vm);
} else {
const char *prog = qemudSaveCompressionTypeToString(header.compressed);
@ -2099,6 +2118,7 @@ endjob:
}
cleanup:
qemuCapsFree(qemuCaps);
VIR_FREE(xml);
if (ret != 0 && is_reg)
unlink(path);