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NFSv4.2: add client side xattr caching.

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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>
This commit is contained in:
Frank van der Linden 2020-06-23 22:39:04 +00:00 • committed by Trond Myklebust
parent 012a211abd
commit 95ad37f90c
9 changed files with 1179 additions and 8 deletions
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1
include/uapi/linux/nfs_fs.h
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@ -56,6 +56,7 @@
#define NFSDBG_PNFS 0x1000
#define NFSDBG_PNFS_LD 0x2000
#define NFSDBG_STATE 0x4000
#define NFSDBG_XATTRCACHE 0x8000
#define NFSDBG_ALL 0xFFFF