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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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10
fs/nfs/nfs4super.c
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@@ -69,6 +69,7 @@ static void nfs4_evict_inode(struct inode *inode)
pnfs_destroy_layout(NFS_I(inode));
/* First call standard NFS clear_inode() code */
nfs_clear_inode(inode);
nfs4_xattr_cache_zap(inode);
}
struct nfs_referral_count {
@@ -268,6 +269,12 @@ static int __init init_nfs_v4(void)
if (err)
goto out1;
#ifdef CONFIG_NFS_V4_2
err = nfs4_xattr_cache_init();
if (err)
goto out2;
#endif
err = nfs4_register_sysctl();
if (err)
goto out2;
@@ -288,6 +295,9 @@ static void __exit exit_nfs_v4(void)
nfs4_pnfs_v3_ds_connect_unload();
unregister_nfs_version(&nfs_v4);
#ifdef CONFIG_NFS_V4_2
nfs4_xattr_cache_exit();
#endif
nfs4_unregister_sysctl();
nfs_idmap_quit();
nfs_dns_resolver_destroy();