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Rewrite qemu-img backing store format handling
When creating qcow2 files with a backing store, it is important to set an explicit format to prevent QEMU probing. The storage backend was only doing this if it found a 'kvm-img' binary. This is wrong because plenty of kvm-img binaries don't support an explicit format, and plenty of 'qemu-img' binaries do support a format. The result was that most qcow2 files were not getting a backing store format. This patch runs 'qemu-img -h' to check for the two support argument formats '-o backing_format=raw' '-F raw' and use whichever option it finds * src/storage/storage_backend.c: Query binary to determine how to set the backing store format
This commit is contained in:
Daniel P. Berrange
parent
03ca42046a
commit
27f45438c8
@ -561,6 +561,69 @@ static int virStorageBackendCreateExecCommand(virStoragePoolObjPtr pool,
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return 0;
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}
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enum {
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QEMU_IMG_BACKING_FORMAT_NONE = 0,
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QEMU_IMG_BACKING_FORMAT_FLAG,
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QEMU_IMG_BACKING_FORMAT_OPTIONS,
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};
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static int virStorageBackendQEMUImgBackingFormat(const char *qemuimg)
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{
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const char *const qemuarg[] = { qemuimg, "-h", NULL };
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const char *const qemuenv[] = { "LC_ALL=C", NULL };
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pid_t child = 0;
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int status;
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int newstdout = -1;
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char *help = NULL;
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enum { MAX_HELP_OUTPUT_SIZE = 1024*8 };
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int len;
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char *start;
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char *end;
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char *tmp;
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int ret = -1;
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if (virExec(qemuarg, qemuenv, NULL,
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&child, -1, &newstdout, NULL, VIR_EXEC_CLEAR_CAPS) < 0)
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goto cleanup;
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if ((len = virFileReadLimFD(newstdout, MAX_HELP_OUTPUT_SIZE, &help)) < 0) {
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virReportSystemError(errno,
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_("Unable to read '%s -h' output"),
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qemuimg);
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goto cleanup;
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}
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start = strstr(help, " create ");
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end = strstr(start, "\n");
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if ((tmp = strstr(start, "-F fmt")) && tmp < end)
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ret = QEMU_IMG_BACKING_FORMAT_FLAG;
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else if ((tmp = strstr(start, "[-o options]")) && tmp < end)
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ret = QEMU_IMG_BACKING_FORMAT_OPTIONS;
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else
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ret = QEMU_IMG_BACKING_FORMAT_NONE;
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cleanup:
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VIR_FREE(help);
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close(newstdout);
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rewait:
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if (child) {
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if (waitpid(child, &status, 0) != child) {
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if (errno == EINTR)
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goto rewait;
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VIR_ERROR(_("Unexpected exit status from qemu %d pid %lu"),
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WEXITSTATUS(status), (unsigned long)child);
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}
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if (WEXITSTATUS(status) != 0) {
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VIR_WARN("Unexpected exit status '%d', qemu probably failed",
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WEXITSTATUS(status));
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}
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}
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return ret;
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}
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static int
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virStorageBackendCreateQemuImg(virConnectPtr conn,
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virStoragePoolObjPtr pool,
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@ -568,10 +631,9 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
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virStorageVolDefPtr inputvol,
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unsigned int flags ATTRIBUTE_UNUSED)
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{
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int ret;
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int ret = -1;
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char size[100];
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char *create_tool;
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short use_kvmimg;
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const char *type = virStorageFileFormatTypeToString(vol->target.format);
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const char *backingType = vol->backingStore.path ?
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@ -582,41 +644,10 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
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const char *inputPath = inputvol ? inputvol->target.path : NULL;
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/* Treat input block devices as 'raw' format */
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const char *inputType = inputPath ?
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virStorageFileFormatTypeToString(inputvol->type == VIR_STORAGE_VOL_BLOCK ? VIR_STORAGE_FILE_RAW : inputvol->target.format) :
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NULL;
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const char **imgargv;
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/* The extra NULL field is for indicating encryption (-e). */
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const char *imgargvnormal[] = {
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NULL, "create",
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"-f", type,
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vol->target.path,
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size,
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NULL,
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NULL
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};
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/* Extra NULL fields are for including "backingType" when using
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* kvm-img (-F backingType), and for indicating encryption (-e).
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*/
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const char *imgargvbacking[] = {
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NULL, "create",
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"-f", type,
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"-b", vol->backingStore.path,
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vol->target.path,
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size,
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NULL,
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NULL,
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NULL,
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NULL
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};
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const char *convargv[] = {
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NULL, "convert",
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"-f", inputType,
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"-O", type,
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inputPath,
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vol->target.path,
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NULL,
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};
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virStorageFileFormatTypeToString(inputvol->type == VIR_STORAGE_VOL_BLOCK ?
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VIR_STORAGE_FILE_RAW :
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inputvol->target.format) :
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NULL;
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if (type == NULL) {
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virStorageReportError(VIR_ERR_INTERNAL_ERROR,
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@ -690,44 +721,103 @@ virStorageBackendCreateQemuImg(virConnectPtr conn,
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}
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}
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if ((create_tool = virFindFileInPath("kvm-img")) != NULL)
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use_kvmimg = 1;
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else if ((create_tool = virFindFileInPath("qemu-img")) != NULL)
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use_kvmimg = 0;
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else {
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/* Size in KB */
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snprintf(size, sizeof(size), "%lluK", vol->capacity/1024);
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/* KVM is usually ahead of qemu on features, so try that first */
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create_tool = virFindFileInPath("kvm-img");
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if (!create_tool)
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create_tool = virFindFileInPath("qemu-img");
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if (!create_tool) {
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virStorageReportError(VIR_ERR_INTERNAL_ERROR,
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"%s", _("unable to find kvm-img or qemu-img"));
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return -1;
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}
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if (inputvol) {
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convargv[0] = create_tool;
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imgargv = convargv;
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const char *imgargv[] = {
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create_tool,
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"convert",
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"-f", inputType,
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"-O", type,
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inputPath,
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vol->target.path,
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NULL,
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};
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ret = virStorageBackendCreateExecCommand(pool, vol, imgargv);
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} else if (vol->backingStore.path) {
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imgargvbacking[0] = create_tool;
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if (use_kvmimg) {
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imgargvbacking[6] = "-F";
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imgargvbacking[7] = backingType;
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imgargvbacking[8] = vol->target.path;
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imgargvbacking[9] = size;
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const char *imgargv[] = {
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create_tool,
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"create",
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"-f", type,
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"-b", vol->backingStore.path,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL
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};
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int imgformat = virStorageBackendQEMUImgBackingFormat(create_tool);
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char *optflag = NULL;
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if (imgformat < 0)
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goto cleanup;
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switch (imgformat) {
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case QEMU_IMG_BACKING_FORMAT_FLAG:
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imgargv[6] = "-F";
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imgargv[7] = backingType;
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imgargv[8] = vol->target.path;
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imgargv[9] = size;
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if (vol->target.encryption != NULL)
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imgargvbacking[10] = "-e";
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} else if (vol->target.encryption != NULL)
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imgargvbacking[8] = "-e";
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imgargv = imgargvbacking;
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imgargv[10] = "-e";
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break;
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case QEMU_IMG_BACKING_FORMAT_OPTIONS:
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if (virAsprintf(&optflag, "backing_fmt=%s", backingType) < 0) {
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virReportOOMError();
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goto cleanup;
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}
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imgargv[6] = "-o";
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imgargv[7] = optflag;
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imgargv[8] = vol->target.path;
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imgargv[9] = size;
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if (vol->target.encryption != NULL)
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imgargv[10] = "-e";
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break;
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default:
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VIR_INFO("Unable to set backing store format for %s with %s",
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vol->target.path, create_tool);
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imgargv[6] = vol->target.path;
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imgargv[7] = size;
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if (vol->target.encryption != NULL)
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imgargv[8] = "-e";
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}
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ret = virStorageBackendCreateExecCommand(pool, vol, imgargv);
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VIR_FREE(optflag);
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} else {
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imgargvnormal[0] = create_tool;
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imgargv = imgargvnormal;
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/* The extra NULL field is for indicating encryption (-e). */
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const char *imgargv[] = {
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create_tool,
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"create",
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"-f", type,
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vol->target.path,
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size,
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NULL,
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NULL
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};
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if (vol->target.encryption != NULL)
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imgargv[6] = "-e";
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ret = virStorageBackendCreateExecCommand(pool, vol, imgargv);
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}
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/* Size in KB */
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snprintf(size, sizeof(size), "%lluK", vol->capacity/1024);
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ret = virStorageBackendCreateExecCommand(pool, vol, imgargv);
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VIR_FREE(imgargv[0]);
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cleanup:
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VIR_FREE(create_tool);
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return ret;
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}
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