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From: Frank van der Linden <fllinden@amazon.com>
To: <linux-nfs@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>
Subject: [RFC PATCH 18/35] NFSv4.2: add client side xattr caching functions
Date: Fri, 30 Aug 2019 23:38:36 +0000
Message-ID: <69bcfd7de0c47fb0fd45788394ffa52478a63bdc.1568309119.git.fllinden@amazon.com> (raw)
In-Reply-To: <cover.1568309119.git.fllinden@amazon.com>

Implement client side caching for NFSv4.2 extended attributes.

[note: this currently does nothing]

Signed-off-by: Frank van der Linden <fllinden@amazon.com>
---
 fs/nfs/Makefile             |  1 +
 fs/nfs/internal.h           | 16 +++++++++
 fs/nfs/nfs42xattr.c         | 72 +++++++++++++++++++++++++++++++++++++
 include/uapi/linux/nfs_fs.h |  1 +
 4 files changed, 90 insertions(+)
 create mode 100644 fs/nfs/nfs42xattr.c

diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index 34cdeaecccf6..0917598db270 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -31,6 +31,7 @@ nfsv4-$(CONFIG_NFS_USE_LEGACY_DNS) += cache_lib.o
 nfsv4-$(CONFIG_SYSCTL)	+= nfs4sysctl.o
 nfsv4-$(CONFIG_NFS_V4_1)	+= pnfs.o pnfs_dev.o pnfs_nfs.o
 nfsv4-$(CONFIG_NFS_V4_2)	+= nfs42proc.o
+nfsv4-$(CONFIG_NFS_V4_XATTR)	+= nfs42xattr.o
 
 obj-$(CONFIG_PNFS_FILE_LAYOUT) += filelayout/
 obj-$(CONFIG_PNFS_BLOCK) += blocklayout/
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 75645d9ff10b..558b9c8ddfbf 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -583,6 +583,22 @@ extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
 				struct rpc_xprt *xprt,
 				void *data);
 
+#ifdef CONFIG_NFS_V4_XATTR
+extern void nfs4_xattr_cache_add(struct inode *, const char *name,
+				 const char *buf, ssize_t buflen);
+extern void nfs4_xattr_cache_remove(struct inode *, const char *name);
+extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name,
+				char *buf, ssize_t buflen);
+extern void nfs4_xattr_cache_set_list(struct inode *, const char *buf,
+				      ssize_t buflen);
+extern ssize_t nfs4_xattr_cache_list(struct inode *, char *buf, ssize_t buflen);
+extern void nfs4_xattr_cache_zap(struct inode *);
+#else
+static inline void nfs4_xattr_cache_zap(struct inode *)
+{
+}
+#endif
+
 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
 {
 	inode = igrab(inode);
diff --git a/fs/nfs/nfs42xattr.c b/fs/nfs/nfs42xattr.c
new file mode 100644
index 000000000000..40c190cfaa75
--- /dev/null
+++ b/fs/nfs/nfs42xattr.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2019 Amazon.com, Inc. or its affiliates. All rights reserved.
+ *
+ * User extended attribute client side cache functions.
+ *
+ * Author: Frank van der Linden <fllinden@amazon.com>
+ */
+
+#include <linux/errno.h>
+#include <linux/nfs_fs.h>
+
+#include "nfs4_fs.h"
+#include "internal.h"
+
+#define NFSDBG_FACILITY         NFSDBG_XATTRCACHE
+
+
+/*
+ * Retrieve an xattr from the cache.
+ */
+ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name, char *buf,
+			 ssize_t buflen)
+{
+	return -ENOENT;
+}
+
+/*
+ * Retrieve a cached list of xattrs from the cache.
+ */
+ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf, ssize_t buflen)
+{
+	return -ENOENT;
+}
+
+/*
+ * Add an xattr to the cache.
+ *
+ * This also invalidates the xattr list cache.
+ */
+void nfs4_xattr_cache_add(struct inode *inode, const char *name,
+			  const char *buf, ssize_t buflen)
+{
+}
+
+
+/*
+ * Remove an xattr to the cache.
+ *
+ * This also invalidates the xattr list cache.
+ */
+void nfs4_xattr_cache_remove(struct inode *inode, const char *name)
+{
+}
+
+/*
+ * Cache listxattr output, replacing any possible old one.
+ *
+ * Should validate existing cache entries.
+ */
+void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf,
+			       ssize_t buflen)
+{
+}
+
+/*
+ * Zap the entire cache.
+ */
+void nfs4_xattr_cache_zap(struct inode *inode)
+{
+}
diff --git a/include/uapi/linux/nfs_fs.h b/include/uapi/linux/nfs_fs.h
index 7bcc8cd6831d..3afe3767c55d 100644
--- a/include/uapi/linux/nfs_fs.h
+++ b/include/uapi/linux/nfs_fs.h
@@ -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
 
 
-- 
2.17.2


  parent reply index

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-12 17:25 [RFC PATCH 00/35] user xattr support (RFC8276) Frank van der Linden
2019-07-01 17:56 ` [RFC PATCH 02/35] nfs/nfsd: basic NFS4 extended attribute definitions Frank van der Linden
2019-08-26 21:38 ` [RFC PATCH 03/35] NFSv4.2: query the server for extended attribute support Frank van der Linden
2019-08-26 21:53 ` [RFC PATCH 04/35] nfs: parse the {no}user_xattr option Frank van der Linden
2019-08-26 22:06 ` [RFC PATCH 05/35] NFSv4.2: define a function to compute the maximum XDR size for listxattr Frank van der Linden
2019-08-26 22:23 ` [RFC PATCH 06/35] NFSv4.2: define and set initial limits for extended attributes Frank van der Linden
2019-08-26 22:32 ` [RFC PATCH 07/35] NFSv4.2: define argument and response structures for xattr operations Frank van der Linden
2019-08-26 22:44 ` [RFC PATCH 08/35] NFSv4.2: define the encode/decode sizes for the XATTR operations Frank van der Linden
2019-08-26 23:09 ` [RFC PATCH 09/35] NFSv4.2: define and use extended attribute overhead sizes Frank van der Linden
2019-08-27 15:34 ` [RFC PATCH 10/35] NFSv4.2: add client side XDR handling for extended attributes Frank van der Linden
2019-08-27 15:46 ` [RFC PATCH 11/35] nfs: define nfs_access_get_cached function Frank van der Linden
2019-08-27 16:01 ` [RFC PATCH 12/35] NFSv4.2: query the extended attribute access bits Frank van der Linden
2019-08-27 22:51 ` [RFC PATCH 13/35] nfs: modify update_changeattr to deal with regular files Frank van der Linden
2019-08-30 22:48 ` [RFC PATCH 14/35] nfs: define and use the NFS_INO_INVALID_XATTR flag Frank van der Linden
2019-08-30 22:56 ` [RFC PATCH 15/35] nfs: make the buf_to_pages_noslab function available to the nfs code Frank van der Linden
2019-08-30 23:15 ` [RFC PATCH 16/35] NFSv4.2: add the extended attribute proc functions Frank van der Linden
2019-08-30 23:31 ` [RFC PATCH 17/35] NFSv4.2: hook in the user extended attribute handlers Frank van der Linden
2019-08-30 23:38 ` Frank van der Linden [this message]
2019-08-30 23:45 ` [RFC PATCH 19/35] NFSv4.2: call the xattr cache functions Frank van der Linden
2019-08-30 23:59 ` [RFC PATCH 20/35] nfs: add the NFS_V4_XATTR config option Frank van der Linden
2019-08-31  2:12 ` [RFC PATCH 21/35] xattr: modify vfs_{set,remove}xattr for NFS server use Frank van der Linden
2019-08-31 19:00 ` [RFC PATCH 22/35] nfsd: split off the write decode code in to a seperate function Frank van der Linden
2019-08-31 19:19 ` [RFC PATCH 23/35] nfsd: add defines for NFSv4.2 extended attribute support Frank van der Linden
2019-08-31 21:35 ` [RFC PATCH 26/35] nfsd: add structure definitions for xattr requests / responses Frank van der Linden
2019-08-31 23:53 ` [RFC PATCH 24/35] nfsd: define xattr functions to call in to their vfs counterparts Frank van der Linden
2019-09-01  0:13 ` [RFC PATCH 25/35] nfsd: take xattr access bits in to account when checking Frank van der Linden
2019-09-01  1:19 ` [RFC PATCH 27/35] nfsd: implement the xattr procedure functions Frank van der Linden
2019-09-01  2:46 ` [RFC PATCH 01/35] nfsd: make sure the nfsd4_ops array has the right size Frank van der Linden
2019-09-02 19:40 ` [RFC PATCH 28/35] nfsd: define xattr reply size functions Frank van der Linden
2019-09-02 19:58 ` [RFC PATCH 29/35] nfsd: add xattr XDR decode functions Frank van der Linden
2019-09-02 20:09 ` [RFC PATCH 30/35] nfsd: add xattr XDR encode functions Frank van der Linden
2019-09-02 20:19 ` [RFC PATCH 31/35] nfsd: add xattr operations to ops array Frank van der Linden
2019-09-02 20:34 ` [RFC PATCH 32/35] xattr: add a function to check if a namespace is supported Frank van der Linden
2019-09-02 21:30 ` [RFC PATCH 33/35] nfsd: add fattr support for user extended attributes Frank van der Linden
2019-09-02 23:06 ` [RFC PATCH 34/35] nfsd: add export flag to disable " Frank van der Linden
2019-09-02 23:17 ` [RFC PATCH 35/35] nfsd: add NFSD_V4_XATTR config option Frank van der Linden
2019-10-24 20:16 ` [RFC PATCH 00/35] user xattr support (RFC8276) Chuck Lever
2019-10-24 23:15   ` Frank van der Linden
2019-10-25 19:55     ` Chuck Lever
2019-11-04  3:01       ` bfields
2019-11-04 15:36         ` Chuck Lever
2019-11-04 16:21           ` Frank van der Linden
2019-11-04 22:58             ` Bruce Fields
2019-11-05  0:06               ` Frank van der Linden
2019-11-05 15:44               ` Chuck Lever

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