[libvirt] [PATCH 6/9] storage: Implement 'CreateBlockFrom' helper.
Add a 'CreateBlockFrom' in the global storage_backend, which sets up the
destination block device: CopyFromFD does the rest of the cloning.
---
src/storage_backend.c | 46 +++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 45 insertions(+), 1 deletions(-)
diff --git a/src/storage_backend.c b/src/storage_backend.c
index 868c297..37c227f 100644
--- a/src/storage_backend.c
+++ b/src/storage_backend.c
@@ -190,6 +190,47 @@ cleanup:
return ret;
}
+static int
+virStorageBackendCreateBlockFrom(virConnectPtr conn,
+ virStorageVolDefPtr vol,
+ virStorageVolDefPtr inputvol,
+ unsigned int flags ATTRIBUTE_UNUSED)
+{
+ int fd = -1;
+ int ret = -1;
+ unsigned long long remain;
+
+ if ((fd = open(vol->target.path, O_RDWR)) < 0) {
+ virReportSystemError(conn, errno,
+ _("cannot create path '%s'"),
+ vol->target.path);
+ goto cleanup;
+ }
+
+ remain = vol->allocation;
+
+ if (inputvol) {
+ int res = virStorageBackendCopyToFD(conn, vol, inputvol, fd, &remain);
+ if (res < 0)
+ goto cleanup;
+ }
+
+ if (close(fd) < 0) {
+ virReportSystemError(conn, errno,
+ _("cannot close file '%s'"),
+ vol->target.path);
+ goto cleanup;
+ }
+ fd = -1;
+
+ ret = 0;
+cleanup:
+ if (fd != -1)
+ close(fd);
+
+ return ret;
+}
+
int
virStorageBackendCreateRaw(virConnectPtr conn,
virStorageVolDefPtr vol,
@@ -517,7 +558,10 @@ virStorageBackendGetBuildVolFromFunction(virConnectPtr conn,
return virStorageBackendFSImageToolTypeToFunc(conn, tool_type);
}
- return virStorageBackendCreateRaw;
+ if (vol->type == VIR_STORAGE_VOL_BLOCK)
+ return virStorageBackendCreateBlockFrom;
+ else
+ return virStorageBackendCreateRaw;
}
#if defined(UDEVADM) || defined(UDEVSETTLE)
--
1.6.0.6