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storage: Implement 'CreateBlockFrom' helper.

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Add a 'CreateBlockFrom' in the global storage_backend, which sets up the
destination block device: CopyFromFD does the rest of the cloning.
This commit is contained in:
Cole Robinson 2009-07-09 19:14:51 -04:00
parent a256fccfe1
commit 7471357081
1 changed files with 45 additions and 1 deletions
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46
src/storage_backend.c
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@ -192,6 +192,47 @@ 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,
@ -533,7 +574,10 @@ 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)