On Thu, 27 Mar 2014 16:55:53 +0530, Sankar P said: > The size of the "uid" in UNIX is just 16 bits. So what is the way used > by the Linux [filesystems] to store the GUID in linux to uniquely > identify an user ? The filesystem only stores UIDs, not GUIDS for users. > Were there any proposals in the past, to increase the size of the unix > uid to match that of a GUID ? There's been proposals. They usually end up dying off because the person making the proposal can't make the business case. What *actual* benefits do we get from doing this? Wnat problem does it solve that (for instance) aren't solved just as well by doing uid-guid mapping in the nfsd or cifs code as things go out on the wire? How do we do conversion of all the existing filesystems that only store 32-bit values? What's the performance impact of having to do 128-bit comparisons rather than 32-bit?
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