[libvirt] directory storage pools reported available space

We recently had an issue with not being able to allocate the full capacity of a directory based storage pool. The reported value via pool-info was larger than what was available to the image creator. Looking at the storage code, in virStorageBackendFileSystemRefresh() we're using statvfs, and reporting back pool->def->available = ((unsigned long long)sb.f_bfree * (unsigned long long)sb.f_bsize); Which is the amount of blocks available, including any root reservation if present on the filesystem. This does't line up with df output , which at least on RHEL5 and 6 systems reports the available space from f_bavail, which excludes and reserved space. Is it reasonable to have the available value line up with output from df and not report reserved space? -- Ryan Harper Software Engineer; Linux Technology Center IBM Corp., Austin, Tx ryanh(a)us.ibm.com