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Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -07001/*
2 * linux/fs/9p/vfs_file.c
3 *
4 * This file contians vfs file ops for 9P2000.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
Eric Van Hensbergen42e8c502006-03-25 03:07:28 -080010 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070012 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
Al Viro914e2632006-10-18 13:55:46 -040029#include <linux/sched.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070030#include <linux/file.h>
31#include <linux/stat.h>
32#include <linux/string.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070033#include <linux/inet.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070034#include <linux/list.h>
35#include <asm/uaccess.h>
36#include <linux/idr.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050037#include <net/9p/9p.h>
38#include <net/9p/client.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070039
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070040#include "v9fs.h"
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070041#include "v9fs_vfs.h"
42#include "fid.h"
43
Adrian Bunkd32b6872007-03-05 02:49:48 +010044static const struct file_operations v9fs_cached_file_operations;
45
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070046/**
47 * v9fs_file_open - open a file (or directory)
48 * @inode: inode to be opened
49 * @file: file being opened
50 *
51 */
52
53int v9fs_file_open(struct inode *inode, struct file *file)
54{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080055 int err;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050056 struct v9fs_session_info *v9ses;
57 struct p9_fid *fid;
58 int omode;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070059
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050060 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file);
61 v9ses = v9fs_inode2v9ses(inode);
Eric Van Hensbergen2e4bef42008-06-24 17:39:39 -050062 omode = v9fs_uflags2omode(file->f_flags, v9fs_extended(v9ses));
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050063 fid = file->private_data;
64 if (!fid) {
65 fid = v9fs_fid_clone(file->f_path.dentry);
66 if (IS_ERR(fid))
67 return PTR_ERR(fid);
68
69 err = p9_client_open(fid, omode);
Eric Van Hensbergen9523a842007-07-13 13:01:27 -050070 if (err < 0) {
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050071 p9_client_clunk(fid);
72 return err;
73 }
Eric Van Hensbergen9523a842007-07-13 13:01:27 -050074 if (omode & P9_OTRUNC) {
75 inode->i_size = 0;
76 inode->i_blocks = 0;
77 }
Eric Van Hensbergen2e4bef42008-06-24 17:39:39 -050078 if ((file->f_flags & O_APPEND) && (!v9fs_extended(v9ses)))
79 generic_file_llseek(file, 0, SEEK_END);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080080 }
81
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050082 file->private_data = fid;
83 if ((fid->qid.version) && (v9ses->cache)) {
84 P9_DPRINTK(P9_DEBUG_VFS, "cached");
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060085 /* enable cached file options */
86 if(file->f_op == &v9fs_file_operations)
87 file->f_op = &v9fs_cached_file_operations;
88 }
89
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070090 return 0;
91}
92
93/**
94 * v9fs_file_lock - lock a file (or directory)
Eric Van Hensbergenee443992008-03-05 07:08:09 -060095 * @filp: file to be locked
96 * @cmd: lock command
97 * @fl: file lock structure
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070098 *
Eric Van Hensbergenee443992008-03-05 07:08:09 -060099 * Bugs: this looks like a local only lock, we should extend into 9P
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700100 * by using open exclusive
101 */
102
103static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
104{
105 int res = 0;
Josef "Jeff" Sipekd6f787b2006-12-08 02:36:45 -0800106 struct inode *inode = filp->f_path.dentry->d_inode;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700107
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500108 P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700109
110 /* No mandatory locks */
Pavel Emelyanov66abe5f2007-10-01 14:41:13 -0700111 if (__mandatory_lock(inode))
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700112 return -ENOLCK;
113
114 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
OGAWA Hirofumi28fd1292006-01-08 01:02:14 -0800115 filemap_write_and_wait(inode->i_mapping);
Andrew Mortonfc0ecff2007-02-10 01:45:39 -0800116 invalidate_mapping_pages(&inode->i_data, 0, -1);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700117 }
118
119 return res;
120}
121
122/**
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500123 * v9fs_file_readn - read from a file
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600124 * @filp: file pointer to read
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700125 * @data: data buffer to read data into
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500126 * @udata: user data buffer to read data into
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700127 * @count: size of buffer
128 * @offset: offset at which to read data
129 *
130 */
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500131
132ssize_t
133v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
134 u64 offset)
135{
136 int n, total;
137 struct p9_fid *fid = filp->private_data;
138
139 P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid,
140 (long long unsigned) offset, count);
141
142 n = 0;
143 total = 0;
144 do {
145 n = p9_client_read(fid, data, udata, offset, count);
146 if (n <= 0)
147 break;
148
149 if (data)
150 data += n;
151 if (udata)
152 udata += n;
153
154 offset += n;
155 count -= n;
156 total += n;
157 } while (count > 0 && n == (fid->clnt->msize - P9_IOHDRSZ));
158
159 if (n < 0)
160 total = n;
161
162 return total;
163}
164
165/**
166 * v9fs_file_read - read from a file
167 * @filp: file pointer to read
168 * @udata: user data buffer to read data into
169 * @count: size of buffer
170 * @offset: offset at which to read data
171 *
172 */
173
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700174static ssize_t
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500175v9fs_file_read(struct file *filp, char __user *udata, size_t count,
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700176 loff_t * offset)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700177{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500178 int ret;
179 struct p9_fid *fid;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700180
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500181 P9_DPRINTK(P9_DEBUG_VFS, "count %d offset %lld\n", count, *offset);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500182 fid = filp->private_data;
Eric Van Hensbergenfbedadc2008-10-13 20:36:16 -0500183
184 if (count > (fid->clnt->msize - P9_IOHDRSZ))
185 ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
186 else
187 ret = p9_client_read(fid, NULL, udata, *offset, count);
188
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500189 if (ret > 0)
190 *offset += ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700191
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500192 return ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700193}
194
195/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700196 * v9fs_file_write - write to a file
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600197 * @filp: file pointer to write
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700198 * @data: data buffer to write data from
199 * @count: size of buffer
200 * @offset: offset at which to write data
201 *
202 */
203
204static ssize_t
205v9fs_file_write(struct file *filp, const char __user * data,
206 size_t count, loff_t * offset)
207{
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500208 int ret;
209 struct p9_fid *fid;
Eric Van Hensbergen9523a842007-07-13 13:01:27 -0500210 struct inode *inode = filp->f_path.dentry->d_inode;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700211
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500212 P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
213 (int)count, (int)*offset);
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700214
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500215 fid = filp->private_data;
Eric Van Hensbergen0fc96552008-10-13 20:36:17 -0500216 ret = p9_client_write(fid, NULL, data, *offset, count);
Eric Van Hensbergen50fd8012007-10-17 14:31:07 -0500217 if (ret > 0) {
218 invalidate_inode_pages2_range(inode->i_mapping, *offset,
219 *offset+ret);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500220 *offset += ret;
Eric Van Hensbergen50fd8012007-10-17 14:31:07 -0500221 }
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700222
Eric Van Hensbergen9523a842007-07-13 13:01:27 -0500223 if (*offset > inode->i_size) {
224 inode->i_size = *offset;
225 inode->i_blocks = (inode->i_size + 512 - 1) >> 9;
226 }
227
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500228 return ret;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700229}
230
Adrian Bunkd32b6872007-03-05 02:49:48 +0100231static const struct file_operations v9fs_cached_file_operations = {
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600232 .llseek = generic_file_llseek,
233 .read = do_sync_read,
234 .aio_read = generic_file_aio_read,
235 .write = v9fs_file_write,
236 .open = v9fs_file_open,
237 .release = v9fs_dir_release,
238 .lock = v9fs_file_lock,
Eric Van Hensbergen14b88692008-02-06 19:25:05 -0600239 .mmap = generic_file_readonly_mmap,
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600240};
241
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800242const struct file_operations v9fs_file_operations = {
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700243 .llseek = generic_file_llseek,
244 .read = v9fs_file_read,
245 .write = v9fs_file_write,
246 .open = v9fs_file_open,
247 .release = v9fs_dir_release,
248 .lock = v9fs_file_lock,
Eric Van Hensbergen14b88692008-02-06 19:25:05 -0600249 .mmap = generic_file_readonly_mmap,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700250};