blob: 0886f1db59179d1e0414d37a5012714cbdf334e3 [file] [log] [blame]
Anna Schumaker1c6dcbe2014-09-26 13:58:48 -04001/*
2 * Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
3 */
4#include <linux/fs.h>
5#include <linux/sunrpc/sched.h>
6#include <linux/nfs.h>
7#include <linux/nfs3.h>
8#include <linux/nfs4.h>
9#include <linux/nfs_xdr.h>
10#include <linux/nfs_fs.h>
11#include "nfs4_fs.h"
12#include "nfs42.h"
13
14static int nfs42_set_rw_stateid(nfs4_stateid *dst, struct file *file,
15 fmode_t fmode)
16{
17 struct nfs_open_context *open;
18 struct nfs_lock_context *lock;
19 int ret;
20
21 open = get_nfs_open_context(nfs_file_open_context(file));
22 lock = nfs_get_lock_context(open);
23 if (IS_ERR(lock)) {
24 put_nfs_open_context(open);
25 return PTR_ERR(lock);
26 }
27
28 ret = nfs4_set_rw_stateid(dst, open, lock, fmode);
29
30 nfs_put_lock_context(lock);
31 put_nfs_open_context(open);
32 return ret;
33}
34
35loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
36{
37 struct inode *inode = file_inode(filep);
38 struct nfs42_seek_args args = {
39 .sa_fh = NFS_FH(inode),
40 .sa_offset = offset,
41 .sa_what = (whence == SEEK_HOLE) ?
42 NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
43 };
44 struct nfs42_seek_res res;
45 struct rpc_message msg = {
46 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
47 .rpc_argp = &args,
48 .rpc_resp = &res,
49 };
50 struct nfs_server *server = NFS_SERVER(inode);
51 int status;
52
53 if (!(server->caps & NFS_CAP_SEEK))
54 return -ENOTSUPP;
55
56 status = nfs42_set_rw_stateid(&args.sa_stateid, filep, FMODE_READ);
57 if (status)
58 return status;
59
60 nfs_wb_all(inode);
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;
65 if (status)
66 return status;
67
68 return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
69}