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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>
33#include <linux/smp_lock.h>
34#include <linux/inet.h>
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070035#include <linux/list.h>
36#include <asm/uaccess.h>
37#include <linux/idr.h>
38
39#include "debug.h"
40#include "v9fs.h"
41#include "9p.h"
42#include "v9fs_vfs.h"
43#include "fid.h"
44
45/**
46 * v9fs_file_open - open a file (or directory)
47 * @inode: inode to be opened
48 * @file: file being opened
49 *
50 */
51
52int v9fs_file_open(struct inode *inode, struct file *file)
53{
54 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080055 struct v9fs_fid *vfid;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070056 struct v9fs_fcall *fcall = NULL;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080057 int omode;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080058 int err;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070059
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -070060 dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file);
61
Eric Van Hensbergenda977b22007-01-26 00:57:06 -080062 vfid = v9fs_fid_clone(file->f_path.dentry);
63 if (IS_ERR(vfid))
64 return PTR_ERR(vfid);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070065
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -080066 omode = v9fs_uflags2omode(file->f_flags);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -080067 err = v9fs_t_open(v9ses, vfid->fid, omode, &fcall);
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -080068 if (err < 0) {
69 PRINT_FCALL_ERROR("open failed", fcall);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -080070 goto Clunk_Fid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080071 }
72
73 file->private_data = vfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080074 vfid->fidopen = 1;
75 vfid->fidclunked = 0;
76 vfid->iounit = fcall->params.ropen.iounit;
77 vfid->rdir_pos = 0;
78 vfid->rdir_fcall = NULL;
79 vfid->filp = file;
80 kfree(fcall);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070081
Eric Van Hensbergene03abc02007-02-11 13:21:39 -060082 if((vfid->qid.version) && (v9ses->cache)) {
83 dprintk(DEBUG_VFS, "cached");
84 /* enable cached file options */
85 if(file->f_op == &v9fs_file_operations)
86 file->f_op = &v9fs_cached_file_operations;
87 }
88
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070089 return 0;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080090
Eric Van Hensbergenda977b22007-01-26 00:57:06 -080091Clunk_Fid:
92 v9fs_fid_clunk(v9ses, vfid);
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -080093 kfree(fcall);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -080094
95 return err;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -070096}
97
98/**
99 * v9fs_file_lock - lock a file (or directory)
100 * @inode: inode to be opened
101 * @file: file being opened
102 *
103 * XXX - this looks like a local only lock, we should extend into 9P
104 * by using open exclusive
105 */
106
107static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
108{
109 int res = 0;
Josef "Jeff" Sipekd6f787b2006-12-08 02:36:45 -0800110 struct inode *inode = filp->f_path.dentry->d_inode;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700111
112 dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
113
114 /* No mandatory locks */
115 if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
116 return -ENOLCK;
117
118 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
OGAWA Hirofumi28fd1292006-01-08 01:02:14 -0800119 filemap_write_and_wait(inode->i_mapping);
Andrew Mortonfc0ecff2007-02-10 01:45:39 -0800120 invalidate_mapping_pages(&inode->i_data, 0, -1);
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700121 }
122
123 return res;
124}
125
126/**
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700127 * v9fs_file_read - read from a file
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700128 * @filep: file pointer to read
129 * @data: data buffer to read data into
130 * @count: size of buffer
131 * @offset: offset at which to read data
132 *
133 */
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700134static ssize_t
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700135v9fs_file_read(struct file *filp, char __user * data, size_t count,
136 loff_t * offset)
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700137{
Josef "Jeff" Sipekd6f787b2006-12-08 02:36:45 -0800138 struct inode *inode = filp->f_path.dentry->d_inode;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700139 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
140 struct v9fs_fid *v9f = filp->private_data;
141 struct v9fs_fcall *fcall = NULL;
142 int fid = v9f->fid;
143 int rsize = 0;
144 int result = 0;
145 int total = 0;
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700146 int n;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700147
148 dprintk(DEBUG_VFS, "\n");
149
150 rsize = v9ses->maxdata - V9FS_IOHDRSZ;
151 if (v9f->iounit != 0 && rsize > v9f->iounit)
152 rsize = v9f->iounit;
153
154 do {
155 if (count < rsize)
156 rsize = count;
157
158 result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall);
159
160 if (result < 0) {
161 printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n",
162 result);
163
164 kfree(fcall);
165 return total;
166 } else
167 *offset += result;
168
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700169 n = copy_to_user(data, fcall->params.rread.data, result);
170 if (n) {
171 dprintk(DEBUG_ERROR, "Problem copying to user %d\n", n);
172 kfree(fcall);
173 return -EFAULT;
174 }
175
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700176 count -= result;
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700177 data += result;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700178 total += result;
179
180 kfree(fcall);
181
182 if (result < rsize)
183 break;
184 } while (count);
185
186 return total;
187}
188
189/**
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700190 * v9fs_file_write - write to a file
191 * @filep: file pointer to write
192 * @data: data buffer to write data from
193 * @count: size of buffer
194 * @offset: offset at which to write data
195 *
196 */
197
198static ssize_t
199v9fs_file_write(struct file *filp, const char __user * data,
200 size_t count, loff_t * offset)
201{
Josef "Jeff" Sipekd6f787b2006-12-08 02:36:45 -0800202 struct inode *inode = filp->f_path.dentry->d_inode;
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700203 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
204 struct v9fs_fid *v9fid = filp->private_data;
205 struct v9fs_fcall *fcall;
206 int fid = v9fid->fid;
207 int result = -EIO;
208 int rsize = 0;
209 int total = 0;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700210
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700211 dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count,
212 (int)*offset);
213 rsize = v9ses->maxdata - V9FS_IOHDRSZ;
214 if (v9fid->iounit != 0 && rsize > v9fid->iounit)
215 rsize = v9fid->iounit;
216
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700217 do {
218 if (count < rsize)
219 rsize = count;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700220
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800221 result = v9fs_t_write(v9ses, fid, *offset, rsize, data, &fcall);
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700222 if (result < 0) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800223 PRINT_FCALL_ERROR("error while writing", fcall);
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700224 kfree(fcall);
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700225 return result;
226 } else
227 *offset += result;
228
229 kfree(fcall);
230 fcall = NULL;
231
232 if (result != rsize) {
233 eprintk(KERN_ERR,
234 "short write: v9fs_t_write returned %d\n",
235 result);
236 break;
237 }
238
239 count -= result;
240 data += result;
241 total += result;
242 } while (count);
243
Andrew Mortonfc0ecff2007-02-10 01:45:39 -0800244 invalidate_inode_pages2(inode->i_mapping);
Latchesar Ionkov19cba8a2005-10-11 08:29:03 -0700245 return total;
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700246}
247
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600248const struct file_operations v9fs_cached_file_operations = {
249 .llseek = generic_file_llseek,
250 .read = do_sync_read,
251 .aio_read = generic_file_aio_read,
252 .write = v9fs_file_write,
253 .open = v9fs_file_open,
254 .release = v9fs_dir_release,
255 .lock = v9fs_file_lock,
256 .mmap = generic_file_mmap,
257};
258
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800259const struct file_operations v9fs_file_operations = {
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700260 .llseek = generic_file_llseek,
261 .read = v9fs_file_read,
262 .write = v9fs_file_write,
263 .open = v9fs_file_open,
264 .release = v9fs_dir_release,
265 .lock = v9fs_file_lock,
Eric Van Hensbergen147b31c2006-01-18 17:43:02 -0800266 .mmap = generic_file_mmap,
Eric Van Hensbergene69e7fe2005-09-09 13:04:18 -0700267};