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, 7 insertions, 5 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 2d18eac6bee5..7f60beb40df3 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2085,7 +2085,7 @@ static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *n
 }
 
 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
-                struct qstr *path, struct iattr *sattr)
+                struct page *page, unsigned int len, struct iattr *sattr)
 {
         struct nfs_server *server = NFS_SERVER(dir);
         struct nfs_fh fhandle;
@@ -2111,10 +2111,11 @@ static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
         };
         int                     status;
 
-        if (path->len > NFS4_MAXPATHLEN)
+        if (len > NFS4_MAXPATHLEN)
                 return -ENAMETOOLONG;
 
-        arg.u.symlink = path;
+        arg.u.symlink.pages = &page;
+        arg.u.symlink.len = len;
         nfs_fattr_init(&fattr);
         nfs_fattr_init(&dir_fattr);
         
@@ -2128,13 +2129,14 @@ static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
 }
 
 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
-                struct qstr *path, struct iattr *sattr)
+                struct page *page, unsigned int len, struct iattr *sattr)
 {
         struct nfs4_exception exception = { };
         int err;
         do {
                 err = nfs4_handle_exception(NFS_SERVER(dir),
-                                _nfs4_proc_symlink(dir, dentry, path, sattr),
+                                _nfs4_proc_symlink(dir, dentry, page,
+                                                        len, sattr),
                                 &exception);
         } while (exception.retry);
         return err;