1/*
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
35static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
36				 loff_t offset, loff_t len)
37{
38	struct inode *inode = file_inode(filep);
39	struct nfs_server *server = NFS_SERVER(inode);
40	struct nfs42_falloc_args args = {
41		.falloc_fh	= NFS_FH(inode),
42		.falloc_offset	= offset,
43		.falloc_length	= len,
44		.falloc_bitmask	= server->cache_consistency_bitmask,
45	};
46	struct nfs42_falloc_res res = {
47		.falloc_server	= server,
48	};
49	int status;
50
51	msg->rpc_argp = &args;
52	msg->rpc_resp = &res;
53
54	status = nfs42_set_rw_stateid(&args.falloc_stateid, filep, FMODE_WRITE);
55	if (status)
56		return status;
57
58	res.falloc_fattr = nfs_alloc_fattr();
59	if (!res.falloc_fattr)
60		return -ENOMEM;
61
62	status = nfs4_call_sync(server->client, server, msg,
63				&args.seq_args, &res.seq_res, 0);
64	if (status == 0)
65		status = nfs_post_op_update_inode(inode, res.falloc_fattr);
66
67	kfree(res.falloc_fattr);
68	return status;
69}
70
71static int nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
72				loff_t offset, loff_t len)
73{
74	struct nfs_server *server = NFS_SERVER(file_inode(filep));
75	struct nfs4_exception exception = { };
76	int err;
77
78	do {
79		err = _nfs42_proc_fallocate(msg, filep, offset, len);
80		if (err == -ENOTSUPP)
81			return -EOPNOTSUPP;
82		err = nfs4_handle_exception(server, err, &exception);
83	} while (exception.retry);
84
85	return err;
86}
87
88int nfs42_proc_allocate(struct file *filep, loff_t offset, loff_t len)
89{
90	struct rpc_message msg = {
91		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ALLOCATE],
92	};
93	struct inode *inode = file_inode(filep);
94	int err;
95
96	if (!nfs_server_capable(inode, NFS_CAP_ALLOCATE))
97		return -EOPNOTSUPP;
98
99	mutex_lock(&inode->i_mutex);
100
101	err = nfs42_proc_fallocate(&msg, filep, offset, len);
102	if (err == -EOPNOTSUPP)
103		NFS_SERVER(inode)->caps &= ~NFS_CAP_ALLOCATE;
104
105	mutex_unlock(&inode->i_mutex);
106	return err;
107}
108
109int nfs42_proc_deallocate(struct file *filep, loff_t offset, loff_t len)
110{
111	struct rpc_message msg = {
112		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DEALLOCATE],
113	};
114	struct inode *inode = file_inode(filep);
115	int err;
116
117	if (!nfs_server_capable(inode, NFS_CAP_DEALLOCATE))
118		return -EOPNOTSUPP;
119
120	nfs_wb_all(inode);
121	mutex_lock(&inode->i_mutex);
122
123	err = nfs42_proc_fallocate(&msg, filep, offset, len);
124	if (err == 0)
125		truncate_pagecache_range(inode, offset, (offset + len) -1);
126	if (err == -EOPNOTSUPP)
127		NFS_SERVER(inode)->caps &= ~NFS_CAP_DEALLOCATE;
128
129	mutex_unlock(&inode->i_mutex);
130	return err;
131}
132
133loff_t nfs42_proc_llseek(struct file *filep, loff_t offset, int whence)
134{
135	struct inode *inode = file_inode(filep);
136	struct nfs42_seek_args args = {
137		.sa_fh		= NFS_FH(inode),
138		.sa_offset	= offset,
139		.sa_what	= (whence == SEEK_HOLE) ?
140					NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA,
141	};
142	struct nfs42_seek_res res;
143	struct rpc_message msg = {
144		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK],
145		.rpc_argp = &args,
146		.rpc_resp = &res,
147	};
148	struct nfs_server *server = NFS_SERVER(inode);
149	int status;
150
151	if (!nfs_server_capable(inode, NFS_CAP_SEEK))
152		return -ENOTSUPP;
153
154	status = nfs42_set_rw_stateid(&args.sa_stateid, filep, FMODE_READ);
155	if (status)
156		return status;
157
158	nfs_wb_all(inode);
159	status = nfs4_call_sync(server->client, server, &msg,
160				&args.seq_args, &res.seq_res, 0);
161	if (status == -ENOTSUPP)
162		server->caps &= ~NFS_CAP_SEEK;
163	if (status)
164		return status;
165
166	return vfs_setpos(filep, res.sr_offset, inode->i_sb->s_maxbytes);
167}
168