[libvirt] [PATCH v2 06/11] qemu: block: Add function to check if storage source allows concurrent access

Storage source format backing a shared device (e.g. running a cluster filesystem) needs to support the sharing so that metadata are not corrupted. Add a central function for checking this. --- src/qemu/qemu_block.c | 15 +++++++++++++++ src/qemu/qemu_block.h | 3 +++ 2 files changed, 18 insertions(+) diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c index 8b23df8227..29a341f149 100644 --- a/src/qemu/qemu_block.c +++ b/src/qemu/qemu_block.c @@ -390,6 +390,21 @@ qemuBlockGetNodeData(virJSONValuePtr data) } +/** + * qemuBlockStorageSourceSupportsConcurrentAccess: + * @src: disk storage source + * + * Returns true if the given storage format supports concurrent access from two + * separate processes. + */ +bool +qemuBlockStorageSourceSupportsConcurrentAccess(virStorageSourcePtr src) +{ + /* no need to check in backing chain since only RAW storage supports this */ + return src->format == VIR_STORAGE_FILE_RAW; +} + + /** * qemuBlockStorageSourceGetURI: * @src: disk storage source diff --git a/src/qemu/qemu_block.h b/src/qemu/qemu_block.h index b9ee97f488..45485733fc 100644 --- a/src/qemu/qemu_block.h +++ b/src/qemu/qemu_block.h @@ -54,6 +54,9 @@ qemuBlockNodeNamesDetect(virQEMUDriverPtr driver, virHashTablePtr qemuBlockGetNodeData(virJSONValuePtr data); +bool +qemuBlockStorageSourceSupportsConcurrentAccess(virStorageSourcePtr src); + virJSONValuePtr qemuBlockStorageSourceGetBackendProps(virStorageSourcePtr src); -- 2.14.3