[PATCH] NFS: Cache the NFSv3 acls.

 Attach acls to inodes in the icache to avoid unnecessary GETACL RPC
 round-trips.  As long as the client doesn't retrieve any acls itself, only the
 default acls of exiting directories and the default and access acls of new
 directories will end up in the cache, which preserves some memory compared to
 always caching the access and default acl of all files.

 Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
 Acked-by: Olaf Kirch <okir@suse.de>
 Signed-off-by: Andrew Morton <akpm@osdl.org>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 7662c5131b47..4ceac9ddac93 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -91,6 +91,8 @@ struct nfs_open_context {
  */
 struct nfs_delegation;
 
+struct posix_acl;
+
 /*
  * nfs fs inode data in memory
  */
@@ -144,6 +146,10 @@ struct nfs_inode {
         atomic_t                data_updates;
 
         struct nfs_access_entry cache_access;
+#ifdef CONFIG_NFS_V3_ACL
+        struct posix_acl        *acl_access;
+        struct posix_acl        *acl_default;
+#endif
 
         /*
          * This is the cookie verifier used for NFSv3 readdir
@@ -480,6 +486,7 @@ extern int nfs3_proc_setacl(struct inode *inode, int type,
                             struct posix_acl *acl);
 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
                 mode_t mode);
+extern void nfs3_forget_cached_acls(struct inode *inode);
 #else
 static inline int nfs3_proc_set_default_acl(struct inode *dir,
                                             struct inode *inode,
@@ -487,6 +494,10 @@ static inline int nfs3_proc_set_default_acl(struct inode *dir,
 {
         return 0;
 }
+
+static inline void nfs3_forget_cached_acls(struct inode *inode)
+{
+}
 #endif /* CONFIG_NFS_V3_ACL */
 
 /*