Re: [libvirt] [PATCHv1 09/13] Split out qemu-img command generation

Do not require the volume definition. This will allow code reuse when creating snapshots. --- src/storage/storage_backend.c | 203 +++++++++++++++++++++++------------------- 1 file changed, 109 insertions(+), 94 deletions(-) diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c index f5b95ec..bfbc193 100644 --- a/src/storage/storage_backend.c +++ b/src/storage/storage_backend.c @@ -870,38 +870,16 @@ virStorageBackendCreateQemuImgOpts(char **opts, return -1; } -/* Create a qemu-img virCommand from the supplied binary path, - * volume definitions and imgformat - */ -virCommandPtr -virStorageBackendCreateQemuImgCmdFromVol(virConnectPtr conn, - virStoragePoolObjPtr pool, - virStorageVolDefPtr vol, - virStorageVolDefPtr inputvol, - unsigned int flags, - const char *create_tool, - int imgformat) +static virCommandPtr +virStorageBackendCreateQemuImgCmd(const char *create_tool, + int imgformat, + struct _virStorageBackendQemuImgInfo info) { virCommandPtr cmd = NULL; - const char *type; + const char *type = NULL; const char *backingType = NULL; const char *inputType = NULL; char *opts = NULL; - struct _virStorageBackendQemuImgInfo info = { - .format = vol->target.format, - .path = vol->target.path, - .encryption = vol->target.encryption != NULL, - .preallocate = !!(flags & VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA), - .compat = vol->target.compat, - .features = vol->target.features, - .nocow = vol->target.nocow, - }; - - virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA, NULL); - - /* Treat output block devices as 'raw' format */ - if (vol->type == VIR_STORAGE_VOL_BLOCK) - info.format = VIR_STORAGE_FILE_RAW; if (!(type = virStorageFileFormatTypeToString(info.format))) { virReportError(VIR_ERR_INTERNAL_ERROR, @@ -926,6 +904,107 @@ virStorageBackendCreateQemuImgCmdFromVol(virConnectPtr conn, return NULL; } + if (info.inputPath && + !(inputType = virStorageFileFormatTypeToString(info.inputFormat))) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("unknown storage vol type %d"), + info.inputFormat); + return NULL; + } + + if (info.backingPath) { + if (info.preallocate) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("metadata preallocation conflicts with backing" + " store")); + return NULL; + } + + if (!(backingType = virStorageFileFormatTypeToString(info.backingFormat))) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("unknown storage vol backing store type %d"), + info.backingFormat); + return NULL; + } + } + + /* ignore the backing volume when we're converting a volume */ + if (info.inputPath) { + info.backingPath = NULL; + backingType = NULL; + }

+ + cmd = virCommandNew(create_tool); + + if (info.inputPath) + virCommandAddArgList(cmd, "convert", "-f", inputType, "-O", type, NULL); + else + virCommandAddArgList(cmd, "create", "-f", type, NULL); + + if (info.backingPath) + virCommandAddArgList(cmd, "-b", info.backingPath, NULL); + + if (imgformat >= QEMU_IMG_BACKING_FORMAT_OPTIONS) { + if (info.format == VIR_STORAGE_FILE_QCOW2 && !info.compat && + imgformat == QEMU_IMG_BACKING_FORMAT_OPTIONS_COMPAT) + info.compat = "0.10"; + + if (virStorageBackendCreateQemuImgOpts(&opts, info) < 0) { + virCommandFree(cmd); + return NULL; + } + if (opts) + virCommandAddArgList(cmd, "-o", opts, NULL); + VIR_FREE(opts); + } else { + if (info.backingPath) { + if (imgformat == QEMU_IMG_BACKING_FORMAT_FLAG) + virCommandAddArgList(cmd, "-F", backingType, NULL); + else + VIR_DEBUG("Unable to set backing store format for %s with %s", + info.path, create_tool); + } + if (info.encryption) + virCommandAddArg(cmd, "-e"); + } + + if (info.inputPath) + virCommandAddArg(cmd, info.inputPath); + virCommandAddArg(cmd, info.path); + if (!info.inputPath && info.size_arg) + virCommandAddArgFormat(cmd, "%lluK", info.size_arg); + return cmd; +}