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由 Eric Blake 提交于
In order to temporarily label files read/write during a commit operation, we need to crawl the backing chain and find the absolute file name that needs labeling in the first place, as well as the name of the file that owns the backing file. * src/util/storage_file.c (virStorageFileChainLookup): New function. * src/util/storage_file.h: Declare it. * src/libvirt_private.syms (storage_file.h): Export it.
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