NFS: Use cached page as buffer for NFS symlink requests

Now that we have a copy of the symlink path in the page cache, we can pass
a struct page down to the XDR routines instead of a string buffer.

Test plan:
Connectathon, all NFS versions.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 10 insertions, 7 deletions

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index ddf5d75e97a2..dc5397d9d23c 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -358,8 +358,8 @@ struct nfs_symlinkargs {
         struct nfs_fh *         fromfh;
         const char *            fromname;
         unsigned int            fromlen;
-        const char *            topath;
-        unsigned int            tolen;
+        struct page **          pages;
+        unsigned int            pathlen;
         struct iattr *          sattr;
 };
 
@@ -434,8 +434,8 @@ struct nfs3_symlinkargs {
         struct nfs_fh *         fromfh;
         const char *            fromname;
         unsigned int            fromlen;
-        const char *            topath;
-        unsigned int            tolen;
+        struct page **          pages;
+        unsigned int            pathlen;
         struct iattr *          sattr;
 };
 
@@ -533,7 +533,10 @@ struct nfs4_accessres {
 struct nfs4_create_arg {
         u32                             ftype;
         union {
-                struct qstr *           symlink;    /* NF4LNK */
+                struct {
+                        struct page **  pages;
+                        unsigned int    len;
+                } symlink;   /* NF4LNK */
                 struct {
                         u32             specdata1;
                         u32             specdata2;
@@ -793,8 +796,8 @@ struct nfs_rpc_ops {
         int     (*rename)  (struct inode *, struct qstr *,
                             struct inode *, struct qstr *);
         int     (*link)    (struct inode *, struct inode *, struct qstr *);
-        int     (*symlink) (struct inode *, struct dentry *, struct qstr *,
-                            struct iattr *);
+        int     (*symlink) (struct inode *, struct dentry *, struct page *,
+                            unsigned int, struct iattr *);
         int     (*mkdir)   (struct inode *, struct dentry *, struct iattr *);
         int     (*rmdir)   (struct inode *, struct qstr *);
         int     (*readdir) (struct dentry *, struct rpc_cred *,