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https://gitlab.com/libvirt/libvirt.git
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VolumeCreateXMLFrom FS storage backend implementation.
Add an extra 'inputvol' parameter to the file volume building routines. This allows us to easily reuse the duplicate functionality.
This commit is contained in:
parent
4aa0959d60
commit
2d1de285b3
@ -1,3 +1,8 @@
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Tue May 19 09:39:01 EDT 2009 Cole Robinson <crobinso@redhat.com>
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* src/storage_backend_fs.c: VolumeCreateXMLFrom FS storage
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backend implementation.
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Tue May 19 09:36:48 EDT 2009 Cole Robinson <crobinso@redhat.com>
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Tue May 19 09:36:48 EDT 2009 Cole Robinson <crobinso@redhat.com>
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* src/storage_backend.h src/storage_driver.c: Storage driver
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* src/storage_backend.h src/storage_driver.c: Storage driver
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@ -62,7 +62,9 @@ static int qcowXGetBackingStore(virConnectPtr, char **,
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static int vmdk4GetBackingStore(virConnectPtr, char **,
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static int vmdk4GetBackingStore(virConnectPtr, char **,
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const unsigned char *, size_t);
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const unsigned char *, size_t);
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typedef int (*createFile)(virConnectPtr conn, virStorageVolDefPtr vol);
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typedef int (*createFile)(virConnectPtr conn,
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virStorageVolDefPtr vol,
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virStorageVolDefPtr inputvol);
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static int track_allocation_progress = 0;
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static int track_allocation_progress = 0;
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@ -1011,15 +1013,29 @@ virStorageBackendFileSystemVolCreate(virConnectPtr conn,
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}
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}
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static int createRaw(virConnectPtr conn,
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static int createRaw(virConnectPtr conn,
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virStorageVolDefPtr vol) {
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virStorageVolDefPtr vol,
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int fd;
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virStorageVolDefPtr inputvol) {
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int fd = -1;
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int inputfd = -1;
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int ret = -1;
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unsigned long long remain;
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char *buf = NULL;
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if ((fd = open(vol->target.path, O_RDWR | O_CREAT | O_EXCL,
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if ((fd = open(vol->target.path, O_RDWR | O_CREAT | O_EXCL,
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vol->target.perms.mode)) < 0) {
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vol->target.perms.mode)) < 0) {
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virReportSystemError(conn, errno,
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virReportSystemError(conn, errno,
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_("cannot create path '%s'"),
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_("cannot create path '%s'"),
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vol->target.path);
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vol->target.path);
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return -1;
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goto cleanup;
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}
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if (inputvol) {
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if ((inputfd = open(inputvol->target.path, O_RDONLY)) < 0) {
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virReportSystemError(conn, errno,
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_("could not open input path '%s'"),
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inputvol->target.path);
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goto cleanup;
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}
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}
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}
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/* Seek to the final size, so the capacity is available upfront
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/* Seek to the final size, so the capacity is available upfront
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@ -1028,15 +1044,66 @@ static int createRaw(virConnectPtr conn,
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virReportSystemError(conn, errno,
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virReportSystemError(conn, errno,
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_("cannot extend file '%s'"),
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_("cannot extend file '%s'"),
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vol->target.path);
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vol->target.path);
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close(fd);
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goto cleanup;
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return -1;
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}
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remain = vol->capacity;
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if (inputfd != -1) {
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int amtread = -1;
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size_t bytes = 1024 * 1024;
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char zerobuf[512];
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bzero(&zerobuf, sizeof(zerobuf));
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if (VIR_ALLOC_N(buf, bytes) < 0) {
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virReportOOMError(conn);
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goto cleanup;
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}
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while (amtread != 0) {
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int amtleft;
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if (remain < bytes)
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bytes = remain;
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if ((amtread = saferead(inputfd, buf, bytes)) < 0) {
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virReportSystemError(conn, errno,
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_("failed reading from file '%s'"),
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inputvol->target.path);
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goto cleanup;
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}
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remain -= amtread;
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/* Loop over amt read in 512 byte increments, looking for sparse
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* blocks */
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amtleft = amtread;
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do {
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int interval = ((512 > amtleft) ? amtleft : 512);
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int offset = amtread - amtleft;
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if (memcmp(buf+offset, zerobuf, interval) == 0) {
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if (lseek(fd, interval, SEEK_CUR) < 0) {
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virReportSystemError(conn, errno,
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_("cannot extend file '%s'"),
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vol->target.path);
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goto cleanup;
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}
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} else if (safewrite(fd, buf+offset, interval) < 0) {
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virReportSystemError(conn, errno,
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_("failed writing to file '%s'"),
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vol->target.path);
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goto cleanup;
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}
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} while ((amtleft -= 512) > 0);
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}
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}
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}
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/* Pre-allocate any data if requested */
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/* Pre-allocate any data if requested */
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/* XXX slooooooooooooooooow on non-extents-based file systems */
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/* XXX slooooooooooooooooow on non-extents-based file systems */
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if (vol->allocation) {
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if (remain) {
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if (track_allocation_progress) {
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if (track_allocation_progress) {
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unsigned long long remain = vol->allocation;
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while (remain) {
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while (remain) {
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/* Allocate in chunks of 512MiB: big-enough chunk
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/* Allocate in chunks of 512MiB: big-enough chunk
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@ -1053,20 +1120,18 @@ static int createRaw(virConnectPtr conn,
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virReportSystemError(conn, r,
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virReportSystemError(conn, r,
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_("cannot fill file '%s'"),
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_("cannot fill file '%s'"),
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vol->target.path);
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vol->target.path);
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close(fd);
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goto cleanup;
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return -1;
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}
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}
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remain -= bytes;
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remain -= bytes;
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}
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}
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} else { /* No progress bars to be shown */
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} else { /* No progress bars to be shown */
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int r;
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int r;
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if ((r = safezero(fd, 0, 0, vol->allocation)) != 0) {
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if ((r = safezero(fd, 0, 0, remain)) != 0) {
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virReportSystemError(conn, r,
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virReportSystemError(conn, r,
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_("cannot fill file '%s'"),
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_("cannot fill file '%s'"),
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vol->target.path);
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vol->target.path);
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close(fd);
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goto cleanup;
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return -1;
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}
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}
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}
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}
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}
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}
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@ -1075,14 +1140,39 @@ static int createRaw(virConnectPtr conn,
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virReportSystemError(conn, errno,
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virReportSystemError(conn, errno,
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_("cannot close file '%s'"),
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_("cannot close file '%s'"),
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vol->target.path);
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vol->target.path);
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return -1;
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goto cleanup;
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}
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}
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fd = -1;
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return 0;
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if (inputfd != -1 && close(inputfd) < 0) {
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virReportSystemError(conn, errno,
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_("cannot close file '%s'"),
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inputvol->target.path);
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goto cleanup;
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}
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inputfd = -1;
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ret = 0;
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cleanup:
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if (fd != -1)
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close(fd);
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if (inputfd != -1)
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close(inputfd);
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VIR_FREE(buf);
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return ret;
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}
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}
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static int createFileDir(virConnectPtr conn,
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static int createFileDir(virConnectPtr conn,
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virStorageVolDefPtr vol) {
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virStorageVolDefPtr vol,
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virStorageVolDefPtr inputvol) {
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if (inputvol) {
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virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
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"%s",
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_("cannot copy from volume to a directory volume"));
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return -1;
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}
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if (mkdir(vol->target.path, vol->target.perms.mode) < 0) {
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if (mkdir(vol->target.path, vol->target.perms.mode) < 0) {
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virReportSystemError(conn, errno,
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virReportSystemError(conn, errno,
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_("cannot create path '%s'"),
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_("cannot create path '%s'"),
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@ -1095,20 +1185,56 @@ static int createFileDir(virConnectPtr conn,
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#if HAVE_QEMU_IMG
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#if HAVE_QEMU_IMG
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static int createQemuImg(virConnectPtr conn,
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static int createQemuImg(virConnectPtr conn,
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virStorageVolDefPtr vol) {
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virStorageVolDefPtr vol,
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virStorageVolDefPtr inputvol) {
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char size[100];
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const char *type = virStorageVolFormatFileSystemTypeToString(vol->target.format);
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const char *type = virStorageVolFormatFileSystemTypeToString(vol->target.format);
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const char *backingType = vol->backingStore.path ?
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const char *backingType = vol->backingStore.path ?
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virStorageVolFormatFileSystemTypeToString(vol->backingStore.format) : NULL;
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virStorageVolFormatFileSystemTypeToString(vol->backingStore.format) : NULL;
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char size[100];
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const char *inputBackingPath = (inputvol ? inputvol->backingStore.path
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: NULL);
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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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virStorageVolFormatFileSystemTypeToString(inputvol->type == VIR_STORAGE_VOL_BLOCK ? VIR_STORAGE_VOL_FILE_RAW : inputvol->target.format) :
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NULL;
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const char **imgargv;
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const char **imgargv;
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const char *imgargvnormal[] = {
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const char *imgargvnormal[] = {
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QEMU_IMG, "create", "-f", type, vol->target.path, size, NULL,
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QEMU_IMG, "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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};
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};
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/* XXX including "backingType" here too, once QEMU accepts
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/* XXX including "backingType" here too, once QEMU accepts
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* the patches to specify it. It'll probably be -F backingType */
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* the patches to specify it. It'll probably be -F backingType */
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const char *imgargvbacking[] = {
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const char *imgargvbacking[] = {
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QEMU_IMG, "create", "-f", type, "-b", vol->backingStore.path, vol->target.path, size, NULL,
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QEMU_IMG, "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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};
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};
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const char *convargv[] = {
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QEMU_IMG, "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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if (inputvol) {
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imgargv = convargv;
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} else if (vol->backingStore.path) {
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imgargv = imgargvbacking;
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} else {
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imgargv = imgargvnormal;
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}
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if (type == NULL) {
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if (type == NULL) {
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virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
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virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
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@ -1116,9 +1242,27 @@ static int createQemuImg(virConnectPtr conn,
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vol->target.format);
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vol->target.format);
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return -1;
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return -1;
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}
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}
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if (vol->backingStore.path == NULL) {
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if (inputvol && inputType == NULL) {
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imgargv = imgargvnormal;
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virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
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} else {
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_("unknown storage vol type %d"),
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inputvol->target.format);
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return -1;
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}
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if (vol->backingStore.path) {
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/* XXX: Not strictly required: qemu-img has an option a different
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* backing store, not really sure what use it serves though, and it
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* may cause issues with lvm. Untested essentially.
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*/
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if (!inputBackingPath ||
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!STREQ(inputBackingPath, vol->backingStore.path)) {
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virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
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"%s", _("a different backing store can not "
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"be specified."));
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return -1;
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}
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if (backingType == NULL) {
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if (backingType == NULL) {
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virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
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virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
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_("unknown storage vol backing store type %d"),
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_("unknown storage vol backing store type %d"),
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@ -1131,8 +1275,6 @@ static int createQemuImg(virConnectPtr conn,
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vol->backingStore.path);
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vol->backingStore.path);
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return -1;
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return -1;
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}
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}
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imgargv = imgargvbacking;
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}
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}
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/* Size in KB */
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/* Size in KB */
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@ -1151,10 +1293,18 @@ static int createQemuImg(virConnectPtr conn,
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* with a partially functional qcow-create. Go figure ??!?
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* with a partially functional qcow-create. Go figure ??!?
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*/
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*/
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static int createQemuCreate(virConnectPtr conn,
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static int createQemuCreate(virConnectPtr conn,
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virStorageVolDefPtr vol) {
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virStorageVolDefPtr vol,
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virStorageVolDefPtr inputvol) {
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char size[100];
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char size[100];
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const char *imgargv[4];
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const char *imgargv[4];
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if (inputvol) {
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virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
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"%s",
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_("cannot copy from volume with qcow-create"));
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return -1;
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}
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if (vol->target.format != VIR_STORAGE_VOL_FILE_QCOW2) {
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if (vol->target.format != VIR_STORAGE_VOL_FILE_QCOW2) {
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virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
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virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
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_("unsupported storage vol type %d"),
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_("unsupported storage vol type %d"),
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@ -1184,19 +1334,22 @@ static int createQemuCreate(virConnectPtr conn,
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}
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}
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#endif /* HAVE_QEMU_IMG, elif HAVE_QCOW_CREATE */
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#endif /* HAVE_QEMU_IMG, elif HAVE_QCOW_CREATE */
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/**
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* Allocate a new file as a volume. This is either done directly
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* for raw/sparse files, or by calling qemu-img/qcow-create for
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* special kinds of files
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*/
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static int
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static int
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virStorageBackendFileSystemVolBuild(virConnectPtr conn,
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_virStorageBackendFileSystemVolBuild(virConnectPtr conn,
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virStorageVolDefPtr vol)
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virStorageVolDefPtr vol,
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virStorageVolDefPtr inputvol)
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{
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{
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int fd;
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int fd;
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createFile create_func;
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createFile create_func;
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if (vol->target.format == VIR_STORAGE_VOL_FILE_RAW) {
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if (vol->target.format == VIR_STORAGE_VOL_FILE_RAW &&
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(!inputvol ||
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(inputvol->type == VIR_STORAGE_VOL_BLOCK ||
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inputvol->target.format == VIR_STORAGE_VOL_FILE_RAW))) {
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/* Raw file creation
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* Raw -> Raw copying
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* Block dev -> Raw copying
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*/
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create_func = createRaw;
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create_func = createRaw;
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} else if (vol->target.format == VIR_STORAGE_VOL_FILE_DIR) {
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} else if (vol->target.format == VIR_STORAGE_VOL_FILE_DIR) {
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create_func = createFileDir;
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create_func = createFileDir;
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@ -1213,7 +1366,7 @@ virStorageBackendFileSystemVolBuild(virConnectPtr conn,
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#endif
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#endif
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}
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}
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if (create_func(conn, vol) < 0)
|
if (create_func(conn, vol, inputvol) < 0)
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return -1;
|
return -1;
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|
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if ((fd = open(vol->target.path, O_RDONLY)) < 0) {
|
if ((fd = open(vol->target.path, O_RDONLY)) < 0) {
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@ -1259,6 +1412,27 @@ virStorageBackendFileSystemVolBuild(virConnectPtr conn,
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return 0;
|
return 0;
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}
|
}
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/**
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||||||
|
* Allocate a new file as a volume. This is either done directly
|
||||||
|
* for raw/sparse files, or by calling qemu-img/qcow-create for
|
||||||
|
* special kinds of files
|
||||||
|
*/
|
||||||
|
static int
|
||||||
|
virStorageBackendFileSystemVolBuild(virConnectPtr conn,
|
||||||
|
virStorageVolDefPtr vol) {
|
||||||
|
return _virStorageBackendFileSystemVolBuild(conn, vol, NULL);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Create a storage vol using 'inputvol' as input
|
||||||
|
*/
|
||||||
|
static int
|
||||||
|
virStorageBackendFileSystemVolBuildFrom(virConnectPtr conn,
|
||||||
|
virStorageVolDefPtr vol,
|
||||||
|
virStorageVolDefPtr inputvol,
|
||||||
|
unsigned int flags ATTRIBUTE_UNUSED) {
|
||||||
|
return _virStorageBackendFileSystemVolBuild(conn, vol, inputvol);
|
||||||
|
}
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* Remove a volume - just unlinks for now
|
* Remove a volume - just unlinks for now
|
||||||
@ -1301,6 +1475,7 @@ virStorageBackend virStorageBackendDirectory = {
|
|||||||
.refreshPool = virStorageBackendFileSystemRefresh,
|
.refreshPool = virStorageBackendFileSystemRefresh,
|
||||||
.deletePool = virStorageBackendFileSystemDelete,
|
.deletePool = virStorageBackendFileSystemDelete,
|
||||||
.buildVol = virStorageBackendFileSystemVolBuild,
|
.buildVol = virStorageBackendFileSystemVolBuild,
|
||||||
|
.buildVolFrom = virStorageBackendFileSystemVolBuildFrom,
|
||||||
.createVol = virStorageBackendFileSystemVolCreate,
|
.createVol = virStorageBackendFileSystemVolCreate,
|
||||||
.refreshVol = virStorageBackendFileSystemVolRefresh,
|
.refreshVol = virStorageBackendFileSystemVolRefresh,
|
||||||
.deleteVol = virStorageBackendFileSystemVolDelete,
|
.deleteVol = virStorageBackendFileSystemVolDelete,
|
||||||
@ -1316,6 +1491,7 @@ virStorageBackend virStorageBackendFileSystem = {
|
|||||||
.stopPool = virStorageBackendFileSystemStop,
|
.stopPool = virStorageBackendFileSystemStop,
|
||||||
.deletePool = virStorageBackendFileSystemDelete,
|
.deletePool = virStorageBackendFileSystemDelete,
|
||||||
.buildVol = virStorageBackendFileSystemVolBuild,
|
.buildVol = virStorageBackendFileSystemVolBuild,
|
||||||
|
.buildVolFrom = virStorageBackendFileSystemVolBuildFrom,
|
||||||
.createVol = virStorageBackendFileSystemVolCreate,
|
.createVol = virStorageBackendFileSystemVolCreate,
|
||||||
.refreshVol = virStorageBackendFileSystemVolRefresh,
|
.refreshVol = virStorageBackendFileSystemVolRefresh,
|
||||||
.deleteVol = virStorageBackendFileSystemVolDelete,
|
.deleteVol = virStorageBackendFileSystemVolDelete,
|
||||||
@ -1330,6 +1506,7 @@ virStorageBackend virStorageBackendNetFileSystem = {
|
|||||||
.stopPool = virStorageBackendFileSystemStop,
|
.stopPool = virStorageBackendFileSystemStop,
|
||||||
.deletePool = virStorageBackendFileSystemDelete,
|
.deletePool = virStorageBackendFileSystemDelete,
|
||||||
.buildVol = virStorageBackendFileSystemVolBuild,
|
.buildVol = virStorageBackendFileSystemVolBuild,
|
||||||
|
.buildVolFrom = virStorageBackendFileSystemVolBuildFrom,
|
||||||
.createVol = virStorageBackendFileSystemVolCreate,
|
.createVol = virStorageBackendFileSystemVolCreate,
|
||||||
.refreshVol = virStorageBackendFileSystemVolRefresh,
|
.refreshVol = virStorageBackendFileSystemVolRefresh,
|
||||||
.deleteVol = virStorageBackendFileSystemVolDelete,
|
.deleteVol = virStorageBackendFileSystemVolDelete,
|
||||||
|
Loading…
Reference in New Issue
Block a user