virStorageFileResize: fallocate the whole capacity

We have been trying to implement the ALLOCATE flag to mean
"the volume should be fully allocated after the resize".

Since commit b0579ed9 we do not allocate from the existing
capacity, but from the existing allocation value.
However this value is a total of all the allocated bytes,
not an offset.

For a sparsely allocated file:
$ perl -e 'print "x"x8192;' > vol1
$ fallocate -p -o 0 -l 4096 vol1
$ virsh vol-info vol1 default
Capacity:       8.00 KiB
Allocation:     4.00 KiB

Treating allocation as an offset would result in an incompletely
allocated file:
$ virsh vol-resize vol1 --pool default 16384 --allocate
Capacity:       16.00 KiB
Allocation:     12.00 KiB

Call fallocate from zero on the whole requested capacity to fully
allocate the file. After that, the volume is fully allocated
after the resize:
$ virsh vol-resize vol1 --pool default 16384 --allocate
$ virsh vol-info vol1 default
Capacity:       16.00 KiB
Allocation:     16.00 KiB

src/storage/storage_util.c

@@ -2329,8 +2329,7 @@ virStorageBackendVolResizeLocal(virConnectPtr conn ATTRIBUTE_UNUSED,
     bool pre_allocate = flags & VIR_STORAGE_VOL_RESIZE_ALLOCATE;
 
     if (vol->target.format == VIR_STORAGE_FILE_RAW) {
-        return virStorageFileResize(vol->target.path, capacity,
-                                    vol->target.allocation, pre_allocate);
+        return virStorageFileResize(vol->target.path, capacity, pre_allocate);
     } else if (vol->target.format == VIR_STORAGE_FILE_PLOOP) {
         return storagePloopResize(vol, capacity);
     } else {

src/util/virstoragefile.c

@@ -1315,17 +1315,11 @@ virStorageFileChainGetBroken(virStorageSourcePtr chain,
 int
 virStorageFileResize(const char *path,
                      unsigned long long capacity,
-                     unsigned long long orig_capacity,
                      bool pre_allocate)
 {
     int fd = -1;
     int ret = -1;
     int rc;
-    off_t offset ATTRIBUTE_UNUSED;
-    off_t len ATTRIBUTE_UNUSED;
-
-    offset = orig_capacity;
-    len = capacity - orig_capacity;
 
     if ((fd = open(path, O_RDWR)) < 0) {
         virReportSystemError(errno, _("Unable to open '%s'"), path);
@@ -1333,7 +1327,7 @@ virStorageFileResize(const char *path,
     }
 
     if (pre_allocate) {
-        if ((rc = virFileAllocate(fd, offset, len)) != 0) {
+        if ((rc = virFileAllocate(fd, 0, capacity)) != 0) {
             if (rc == -2) {
                 virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
                                _("preallocate is not supported on this platform"));

src/util/virstoragefile.h

@@ -328,7 +328,6 @@ virStorageSourcePtr virStorageFileChainLookup(virStorageSourcePtr chain,
 
 int virStorageFileResize(const char *path,
                          unsigned long long capacity,
-                         unsigned long long orig_capacity,
                          bool pre_allocate);
 
 int virStorageFileIsClusterFS(const char *path);