NFSv4.2: add client side xattr caching.
Implement client side caching for NFSv4.2 extended attributes. The cache is a per-inode hashtable, with name/value entries. There is one special entry for the listxattr cache. NFS inodes have a pointer to a cache structure. The cache structure is allocated on demand, freed when the cache is invalidated. Memory shrinkers keep the size in check. Large entries (> PAGE_SIZE) are collected by a separate shrinker, and freed more aggressively than others. Signed-off-by:Frank van der Linden <fllinden@amazon.com> Signed-off-by:
Trond Myklebust <trond.myklebust@hammerspace.com>
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012a211a
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