1 files changed, 69 insertions, 0 deletions

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
new file mode 100644
index 000000000000..0886f1db5917
--- /dev/null
+++ b/fs/nfs/nfs42proc.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
+ */
+#include <linux/fs.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/nfs.h>
+#include <linux/nfs3.h>
+#include <linux/nfs4.h>
+#include <linux/nfs_xdr.h>
+#include <linux/nfs_fs.h>
+#include "nfs4_fs.h"
+#include "nfs42.h"
+
+static int nfs42_set_rw_stateid(nfs4_stateid *dst, struct file *file,
+                                fmode_t fmode)
+{
+        struct nfs_open_context *open;
+        struct nfs_lock_context *lock;
+        int ret;
+
+        open = get_nfs_open_context(nfs_file_open_context(file));
+        lock = nfs_get_lock_context(open);
+        if (IS_ERR(lock)) {
+                put_nfs_open_context(open);
+                return PTR_ERR(lock);
+        }
+
+        ret = nfs4_set_rw_stateid(dst, open, lock, fmode);
+
+        nfs_put_lock_context(lock);
+        put_nfs_open_context(open);
+        return ret;
+}
+
+loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
+{
+        struct inode *inode = file_inode(filep);
+        struct nfs42_seek_args args = {
+                .sa_fh          = NFS_FH(inode),
+                .sa_offset      = offset,
+                .sa_what        = (whence == SEEK_HOLE) ?
+                                        NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
+        };
+        struct nfs42_seek_res res;
+        struct rpc_message msg = {
+                .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
+                .rpc_argp = &args,
+                .rpc_resp = &res,
+        };
+        struct nfs_server *server = NFS_SERVER(inode);
+        int status;
+
+        if (!(server->caps & NFS_CAP_SEEK))
+                return -ENOTSUPP;
+
+        status = nfs42_set_rw_stateid(&args.sa_stateid, filep, FMODE_READ);
+        if (status)
+                return status;
+
+        nfs_wb_all(inode);
+        status = nfs4_call_sync(server->client, server, &msg,
+                                &args.seq_args, &res.seq_res, 0);
+        if (status == -ENOTSUPP)
+                server->caps &= ~NFS_CAP_SEEK;
+        if (status)
+                return status;
+
+        return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
+}