2 * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
5 #include <linux/sunrpc/sched.h>
7 #include <linux/nfs3.h>
8 #include <linux/nfs4.h>
9 #include <linux/nfs_xdr.h>
10 #include <linux/nfs_fs.h>
14 static int nfs42_set_rw_stateid(nfs4_stateid *dst, struct file *file,
17 struct nfs_open_context *open;
18 struct nfs_lock_context *lock;
21 open = get_nfs_open_context(nfs_file_open_context(file));
22 lock = nfs_get_lock_context(open);
24 put_nfs_open_context(open);
28 ret = nfs4_set_rw_stateid(dst, open, lock, fmode);
30 nfs_put_lock_context(lock);
31 put_nfs_open_context(open);
35 loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
37 struct inode *inode = file_inode(filep);
38 struct nfs42_seek_args args = {
39 .sa_fh = NFS_FH(inode),
41 .sa_what = (whence == SEEK_HOLE) ?
42 NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
44 struct nfs42_seek_res res;
45 struct rpc_message msg = {
46 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
50 struct nfs_server *server = NFS_SERVER(inode);
53 if (!(server->caps & NFS_CAP_SEEK))
56 status = nfs42_set_rw_stateid(&args.sa_stateid, filep, FMODE_READ);
61 status = nfs4_call_sync(server->client, server, &msg,
62 &args.seq_args, &res.seq_res, 0);
63 if (status == -ENOTSUPP)
64 server->caps &= ~NFS_CAP_SEEK;
68 return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);