The NFS and RPC layer currently always takes a reference to the credential passed by the user, even in the case where the RPC call is synchronous, or the cred is also being pinned by file pointers and open contexts. In addition, the access cache will take a reference for each cache entry on each file that we've looked up. This patch set attempts to reduce the amount of references that the NFS layer holds, by optimising away a few cases where we're taking the refcount unnecessarily. It also sets a more stringent limit on the number of access cache entries that the NFS layer holds. Trond Myklebust (8): NFS: alloc_nfs_open_context() must use the file cred when available SUNRPC: Add a flag to avoid reference counts on credentials SUNRPC: Don't take a reference to the cred on synchronous tasks NFS: Assume cred is pinned by open context in I/O requests NFSv4: Avoid referencing the cred unnecessarily during NFSv4 I/O NFSv4: Avoid unnecessary credential references in layoutget NFS: Avoid referencing the cred twice in async rename/unlink NFS: Limit the size of the access cache by default fs/nfs/dir.c | 2 +- fs/nfs/inode.c | 10 +++++----- fs/nfs/nfs4proc.c | 12 ++++++------ fs/nfs/pagelist.c | 2 +- fs/nfs/pnfs.c | 3 +-- fs/nfs/unlink.c | 4 ++-- fs/nfs/write.c | 2 +- include/linux/sunrpc/sched.h | 1 + net/sunrpc/clnt.c | 8 ++++++-- net/sunrpc/sched.c | 3 ++- 10 files changed, 26 insertions(+), 21 deletions(-) -- 2.24.1
