[PATCH 06/13] nfs: define nfs_access_get_cached function

Frank van der Linden
2020-03-11T19:56:30Z

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
--
2.16.6