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From:   Frank van der Linden <fllinden@amazon.com>
To:     <linux-nfs@vger.kernel.org>, <anna.schumaker@netapp.com>,
        <trond.myklebust@hammerspace.com>
CC:     Frank van der Linden <fllinden@amazon.com>
Subject: [PATCH v2 06/13] nfs: define nfs_access_get_cached function
Date:   Wed, 25 Mar 2020 23:10:44 +0000
Message-ID: <20200325231051.31652-7-fllinden@amazon.com>
In-Reply-To: <20200325231051.31652-1-fllinden@amazon.com>
References: <20200325231051.31652-1-fllinden@amazon.com>
MIME-Version: 1.0
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Sender: linux-nfs-owner@vger.kernel.org
Precedence: bulk

The only consumer of nfs_access_get_cached_rcu and nfs_access_cached
calls these static functions in order to first try RCU access, and
then locked access.

Combine them in to a single function, and call that. Make this function
available to the rest of the NFS code.

Signed-off-by: Frank van der Linden <fllinden@amazon.com>
---
 fs/nfs/dir.c           | 20 ++++++++++++++++----
 include/linux/nfs_fs.h |  2 ++
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 193d6fb363b7..a0b564781e3e 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2433,7 +2433,7 @@ static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, co
 	return NULL;
 }
 
-static int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res, bool may_block)
+static int nfs_access_get_cached_locked(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res, bool may_block)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
 	struct nfs_access_entry *cache;
@@ -2506,6 +2506,20 @@ static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cre
 	return err;
 }
 
+int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct
+nfs_access_entry *res, bool may_block)
+{
+	int status;
+
+	status = nfs_access_get_cached_rcu(inode, cred, res);
+	if (status != 0)
+		status = nfs_access_get_cached_locked(inode, cred, res,
+		    may_block);
+
+	return status;
+}
+EXPORT_SYMBOL_GPL(nfs_access_get_cached);
+
 static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
@@ -2620,9 +2634,7 @@ static int nfs_do_access(struct inode *inode, const struct cred *cred, int mask)
 
 	trace_nfs_access_enter(inode);
 
-	status = nfs_access_get_cached_rcu(inode, cred, &cache);
-	if (status != 0)
-		status = nfs_access_get_cached(inode, cred, &cache, may_block);
+	status = nfs_access_get_cached(inode, cred, &cache, may_block);
 	if (status == 0)
 		goto out_cached;
 
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 442458e94ab5..e86e7a747092 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -491,6 +491,8 @@ extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
 			struct nfs_fattr *fattr, struct nfs4_label *label);
 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
 extern void nfs_access_zap_cache(struct inode *inode);
+extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res,
+				 bool may_block);
 
 /*
  * linux/fs/nfs/symlink.c
-- 
2.17.2