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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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9
fs/nfs/inode.c
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@ -193,6 +193,7 @@ bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
return nfs_check_cache_invalid_not_delegated(inode, flags);
}
EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
{
@ -234,11 +235,13 @@ static void nfs_zap_caches_locked(struct inode *inode)
| NFS_INO_INVALID_DATA
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
| NFS_INO_INVALID_XATTR
| NFS_INO_REVAL_PAGECACHE);
} else
nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
| NFS_INO_INVALID_XATTR
| NFS_INO_REVAL_PAGECACHE);
nfs_zap_label_cache_locked(nfsi);
}
@ -1897,7 +1900,8 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
if (!(have_writers || have_delegation)) {
invalid |= NFS_INO_INVALID_DATA
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL;
| NFS_INO_INVALID_ACL
| NFS_INO_INVALID_XATTR;
/* Force revalidate of all attributes */
save_cache_validity |= NFS_INO_INVALID_CTIME
| NFS_INO_INVALID_MTIME
@ -2100,6 +2104,9 @@ struct inode *nfs_alloc_inode(struct super_block *sb)
#if IS_ENABLED(CONFIG_NFS_V4)
nfsi->nfs4_acl = NULL;
#endif /* CONFIG_NFS_V4 */
#ifdef CONFIG_NFS_V4_2
nfsi->xattr_cache = NULL;
#endif
return &nfsi->vfs_inode;
}
EXPORT_SYMBOL_GPL(nfs_alloc_inode);