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qemu: use file cache for nbdkit caps

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Add the virFileCache implementation for nbdkit capabilities to the qemu
driver. This allows us to determine whether nbdkit is installed and
which plugins are supported. it also has persistent caching and the
capabilities are re-queried whenever something changes.

Signed-off-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Jonathon Jongsma 2022-07-21 17:34:49 -05:00
parent d0fd04556c
commit 0c00059a72
2 changed files with 6 additions and 0 deletions
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3
src/qemu/qemu_conf.h
View File

@ -318,6 +318,9 @@ struct _virQEMUDriver {
/* Immutable pointer, self-locking APIs */
virHashAtomic *migrationErrors;
/* Immutable pointer, self-locking APIs */
virFileCache *nbdkitCapsCache;
};
virQEMUDriverConfig *virQEMUDriverConfigNew(bool privileged,

3
src/qemu/qemu_driver.c
View File

@ -845,6 +845,8 @@ qemuStateInitialize(bool privileged,
defsecmodel)))
goto error;
qemu_driver->nbdkitCapsCache = qemuNbdkitCapsCacheNew(cfg->cacheDir);
/* If hugetlbfs is present, then we need to create a sub-directory within
* it, since we can't assume the root mount point has permissions that
* will let our spawned QEMU instances use it. */
@ -1078,6 +1080,7 @@ qemuStateCleanup(void)
ebtablesContextFree(qemu_driver->ebtables);
VIR_FREE(qemu_driver->qemuImgBinary);
virObjectUnref(qemu_driver->domains);
virObjectUnref(qemu_driver->nbdkitCapsCache);
if (qemu_driver->lockFD != -1)
virPidFileRelease(qemu_driver->config->stateDir, "driver", qemu_driver->lockFD);