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由 Jiri Denemark 提交于
When virFileOpenAs is called with VIR_FILE_OPEN_AS_UID flag and uid/gid different from root/root while libvirtd is running as root, we fork a new child, change its effective UID/GID to uid/gid and run virFileOpenAsNoFork. It doesn't make any sense to fchown() the opened file in this case since we already know that uid/gid can access the file when open succeeds and one of the following situations may happen: - the file is already owned by uid/gid and we skip fchown even before this patch - the file is owned by uid but not gid because it was created in a directory with SETGID set, in which case it is desirable not to change the group - the file may be owned by a completely different user and/or group because it was created on a root-squashed or even all-squashed NFS filesystem, in which case fchown would most likely fail anyway
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