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storage: resize vol against real allocated size

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Currently, 'vol-resize --allocate' allocates new space at the
vol->capacity offset. But the vol->capacity is not necessarily the same
as vol->allocation. For instance:.

	[root@localhost ~]# virsh vol-list --pool tmp-pool --details
	 Name      Path                   Type  Capacity  Allocation
	-------------------------------------------------------------
	 tmp-vol  /root/tmp-pool/tmp-vol  file  1.00 GiB  1.00 GiB

	[root@localhost ~]# virsh vol-resize tmp-vol --pool tmp-pool 2G

	[root@localhost ~]# virsh vol-list --pool tmp-pool --details
	 Name      Path                   Type  Capacity  Allocation
	-------------------------------------------------------------
	 tmp-vol  /root/tmp-pool/tmp-vol  file  2.00 GiB  1.00 GiB

So, if we want to allocate more bytes, so the file is say 3G big, the
real allocated size is 2G actually:

	[root@localhost ~]# virsh vol-resize tmp-vol --pool tmp-pool 3G --allocate

	[root@localhost ~]# virsh vol-list --pool tmp-pool --details
	 Name      Path                   Type  Capacity  Allocation
	-------------------------------------------------------------
	 tmp-vol  /root/tmp-pool/tmp-vol  file  3.00 GiB  2.00 GiB

This commit uses the correct vol->allocation instead of incorrect
vol->capacity, so the output of the commands above looks like this:

	[root@localhost ~]# virsh vol-resize tmp-vol --pool tmp-pool 3G --allocate

	[root@localhost ~]# virsh vol-list --pool tmp-pool --details
	 Name      Path                   Type  Capacity  Allocation
	-------------------------------------------------------------
	 tmp-vol  /root/tmp-pool/tmp-vol  file  3.00 GiB  3.00 GiB

Moreover, if the '--alocate' flag was used, we must update the
vol->allocation member in storageVolResize API too, not just
vol->capacity.

Reported-by: Wang Sen <wangsen@linux.vnet.ibm.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Michal Privoznik 2013-12-16 13:00:00 +08:00
parent 5d7e4f0cf3
commit b0579ed900
2 changed files with 3 additions and 1 deletions
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2
src/storage/storage_backend_fs.c
View File

@ -1267,7 +1267,7 @@ virStorageBackendFileSystemVolResize(virConnectPtr conn ATTRIBUTE_UNUSED,
if (vol->target.format == VIR_STORAGE_FILE_RAW) {
return virStorageFileResize(vol->target.path, capacity,
vol->capacity, pre_allocate);
vol->allocation, pre_allocate);
} else {
if (pre_allocate) {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",

2
src/storage/storage_driver.c
View File

@ -2029,6 +2029,8 @@ storageVolResize(virStorageVolPtr obj,
goto out;
vol->capacity = abs_capacity;
if (flags & VIR_STORAGE_VOL_RESIZE_ALLOCATE)
vol->allocation = abs_capacity;
/* Update pool metadata */
pool->def->allocation += (abs_capacity - vol->capacity);