On Mon, May 19, 2014 at 8:39 AM, Niels de Vos <[email protected]> wrote: > > The 32 limit you are hitting is caused by FUSE. The Linux kernel module > provides the groups of the process that accesses the FUSE-mountpoint > through /proc/$PID/status (line starting with 'Groups:'). The kernel > does not pass more groups than 32, this limit is hardcoded in the FUSE > kernel module. >
Minor nit - 32 groupid limit is independent of FUSE. It is just the limited number of groupIDs the kernel exposes through proc. FUSE filesystems's only option is to use this sub-optimal interface to get group IDs. It is not unreasonable to actually implement a new reverse call in FUSE over /dev/fuse to resolve group-ids of a given request/process. Even then, the 400byte RPC limit of 93 would apply (we could at some point in the future move away from RPC) Avati
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