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path: root/fs/nfsd/cache.h
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2013-04-03nfsd: add new reply_cache_stats file in nfsdfsJeff Layton
For presenting statistics relating to duplicate reply cache. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2013-02-08nfsd: keep a checksum of the first 256 bytes of requestJeff Layton
Now that we're allowing more DRC entries, it becomes a lot easier to hit problems with XID collisions. In order to mitigate those, calculate a checksum of up to the first 256 bytes of each request coming in and store that in the cache entry, along with the total length of the request. This initially used crc32, but Chuck Lever and Jim Rees pointed out that crc32 is probably more heavyweight than we really need for generating these checksums, and recommended looking at using the same routines that are used to generate checksums for IP packets. On an x86_64 KVM guest measurements with ftrace showed ~800ns to use csum_partial vs ~1750ns for crc32. The difference probably isn't terribly significant, but for now we may as well use csum_partial. Signed-off-by: Jeff Layton <jlayton@redhat.com> Stones-thrown-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2013-02-04nfsd: clean up and clarify the cache expiration codeJeff Layton
Add a preprocessor constant for the expiry time of cache entries, and move the test for an expired entry into a function. Note that the current code does not test for RC_INPROG. It just assumes that it won't take more than 2 minutes to fill out an in-progress entry. I'm not sure how valid that assumption is though, so let's just ensure that we never consider an RC_INPROG entry to be expired. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2013-02-04nfsd: get rid of RC_INTRJeff Layton
The reply cache code never returns this status. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2013-02-04nfsd: fix IPv6 address handling in the DRCJeff Layton
Currently, it only stores the first 16 bytes of any address. struct sockaddr_in6 is 28 bytes however, so we're currently ignoring the last 12 bytes of the address. Expand the c_addr field to a sockaddr_in6, and cast it to a sockaddr_in as necessary. Also fix the comparitor to use the existing RPC helpers for this. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2011-07-18nfsd: turn on reply cache for NFSv4J. Bruce Fields
It's sort of ridiculous that we've never had a working reply cache for NFSv4. On the other hand, we may still not: our current reply cache is likely not very good, especially in the TCP case (which is the only case that matters for v4). What we really need here is some serious testing. Anyway, here's a start. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2009-12-15nfsd: remove pointless paths in file headersJ. Bruce Fields
The new .h files have paths at the top that are now out of date. While we're here, just remove all of those from fs/nfsd; they never served any purpose. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2009-12-14nfsd: Move private headers to source directoryBoaz Harrosh
Lots of include/linux/nfsd/* headers are only used by nfsd module. Move them to the source directory Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>