On Jan 6, 2017, at 3:40 PM, David Howells <dhowells@xxxxxxxxxx> wrote: > > AFS filesystem implementations like OpenAFS have a number of management calls > usually implemented through the pioctl() and afs() system calls. However, > there is general revulsion to the idea of allowing these in Linux as they are > very much abused. > > Now, I need to come up with replacements for these. For some I can use > getxattr()/setxattr(), for some keyrings and for others procfs/sysfs, but for > some I can't. > > One of these is the call to manage local caching on a file or volume. This, > however, doesn't really need to be limited to AFS, but could also be > applicable to NFS, CIFS, etc. - and possibly even to local filesystems. > > A brainstorming session on this would be useful. This is definitely something I'd like to discuss as well. The posix_fadvise() call doesn't interact with the filesystem at all, so it isn't a useful source of cache management hints. We've implemented a Lustre-specific ladvise hint using an ioctl to advise client and server caches, but having a generic hint API would be better. Cheers, Andreas
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