Commit | Line | Data |
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e69e7fe5 EVH |
1 | /* |
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 | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to: | |
21 | * Free Software Foundation | |
22 | * 51 Franklin Street, Fifth Floor | |
23 | * Boston, MA 02111-1301 USA | |
24 | * | |
25 | */ | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/fs.h> | |
30 | #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> | |
531b1094 | 35 | #include <linux/version.h> |
e69e7fe5 EVH |
36 | #include <linux/list.h> |
37 | #include <asm/uaccess.h> | |
38 | #include <linux/idr.h> | |
39 | ||
40 | #include "debug.h" | |
41 | #include "v9fs.h" | |
42 | #include "9p.h" | |
43 | #include "v9fs_vfs.h" | |
44 | #include "fid.h" | |
45 | ||
46 | /** | |
47 | * v9fs_file_open - open a file (or directory) | |
48 | * @inode: inode to be opened | |
49 | * @file: file being opened | |
50 | * | |
51 | */ | |
52 | ||
53 | int v9fs_file_open(struct inode *inode, struct file *file) | |
54 | { | |
55 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
6a3124a3 | 56 | struct v9fs_fid *vfid; |
e69e7fe5 | 57 | struct v9fs_fcall *fcall = NULL; |
6a3124a3 LI |
58 | int omode; |
59 | int fid = V9FS_NOFID; | |
60 | int err; | |
e69e7fe5 | 61 | |
0b8dd177 LI |
62 | dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file); |
63 | ||
6a3124a3 LI |
64 | vfid = v9fs_fid_lookup(file->f_dentry); |
65 | if (!vfid) { | |
e69e7fe5 | 66 | dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n"); |
0b8dd177 LI |
67 | return -EBADF; |
68 | } | |
e69e7fe5 | 69 | |
6a3124a3 LI |
70 | fid = v9fs_get_idpool(&v9ses->fidpool); |
71 | if (fid < 0) { | |
16cce6d2 LI |
72 | eprintk(KERN_WARNING, "newfid fails!\n"); |
73 | return -ENOSPC; | |
74 | } | |
e69e7fe5 | 75 | |
6a3124a3 LI |
76 | err = v9fs_t_walk(v9ses, vfid->fid, fid, NULL, NULL); |
77 | if (err < 0) { | |
16cce6d2 | 78 | dprintk(DEBUG_ERROR, "rewalk didn't work\n"); |
6a3124a3 LI |
79 | goto put_fid; |
80 | } | |
81 | ||
16cce6d2 LI |
82 | /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */ |
83 | /* translate open mode appropriately */ | |
6a3124a3 LI |
84 | omode = v9fs_uflags2omode(file->f_flags); |
85 | err = v9fs_t_open(v9ses, fid, omode, &fcall); | |
86 | if (err < 0) { | |
87 | PRINT_FCALL_ERROR("open failed", fcall); | |
16cce6d2 LI |
88 | goto clunk_fid; |
89 | } | |
90 | ||
91 | vfid = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL); | |
92 | if (vfid == NULL) { | |
93 | dprintk(DEBUG_ERROR, "out of memory\n"); | |
94 | err = -ENOMEM; | |
95 | goto clunk_fid; | |
6a3124a3 | 96 | } |
e69e7fe5 | 97 | |
6a3124a3 LI |
98 | file->private_data = vfid; |
99 | vfid->fid = fid; | |
100 | vfid->fidopen = 1; | |
101 | vfid->fidclunked = 0; | |
102 | vfid->iounit = fcall->params.ropen.iounit; | |
103 | vfid->rdir_pos = 0; | |
104 | vfid->rdir_fcall = NULL; | |
105 | vfid->filp = file; | |
106 | kfree(fcall); | |
e69e7fe5 | 107 | |
6a3124a3 | 108 | return 0; |
e69e7fe5 | 109 | |
6a3124a3 LI |
110 | clunk_fid: |
111 | v9fs_t_clunk(v9ses, fid); | |
e69e7fe5 | 112 | |
6a3124a3 LI |
113 | put_fid: |
114 | v9fs_put_idpool(fid, &v9ses->fidpool); | |
16cce6d2 | 115 | kfree(fcall); |
e69e7fe5 | 116 | |
6a3124a3 | 117 | return err; |
e69e7fe5 EVH |
118 | } |
119 | ||
120 | /** | |
121 | * v9fs_file_lock - lock a file (or directory) | |
122 | * @inode: inode to be opened | |
123 | * @file: file being opened | |
124 | * | |
125 | * XXX - this looks like a local only lock, we should extend into 9P | |
126 | * by using open exclusive | |
127 | */ | |
128 | ||
129 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
130 | { | |
131 | int res = 0; | |
132 | struct inode *inode = filp->f_dentry->d_inode; | |
133 | ||
134 | dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); | |
135 | ||
136 | /* No mandatory locks */ | |
137 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
138 | return -ENOLCK; | |
139 | ||
140 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
28fd1298 | 141 | filemap_write_and_wait(inode->i_mapping); |
e69e7fe5 EVH |
142 | invalidate_inode_pages(&inode->i_data); |
143 | } | |
144 | ||
145 | return res; | |
146 | } | |
147 | ||
148 | /** | |
19cba8ab | 149 | * v9fs_file_read - read from a file |
e69e7fe5 EVH |
150 | * @filep: file pointer to read |
151 | * @data: data buffer to read data into | |
152 | * @count: size of buffer | |
153 | * @offset: offset at which to read data | |
154 | * | |
155 | */ | |
e69e7fe5 | 156 | static ssize_t |
19cba8ab LI |
157 | v9fs_file_read(struct file *filp, char __user * data, size_t count, |
158 | loff_t * offset) | |
e69e7fe5 EVH |
159 | { |
160 | struct inode *inode = filp->f_dentry->d_inode; | |
161 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
162 | struct v9fs_fid *v9f = filp->private_data; | |
163 | struct v9fs_fcall *fcall = NULL; | |
164 | int fid = v9f->fid; | |
165 | int rsize = 0; | |
166 | int result = 0; | |
167 | int total = 0; | |
19cba8ab | 168 | int n; |
e69e7fe5 EVH |
169 | |
170 | dprintk(DEBUG_VFS, "\n"); | |
171 | ||
172 | rsize = v9ses->maxdata - V9FS_IOHDRSZ; | |
173 | if (v9f->iounit != 0 && rsize > v9f->iounit) | |
174 | rsize = v9f->iounit; | |
175 | ||
176 | do { | |
177 | if (count < rsize) | |
178 | rsize = count; | |
179 | ||
180 | result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall); | |
181 | ||
182 | if (result < 0) { | |
183 | printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n", | |
184 | result); | |
185 | ||
186 | kfree(fcall); | |
187 | return total; | |
188 | } else | |
189 | *offset += result; | |
190 | ||
19cba8ab LI |
191 | n = copy_to_user(data, fcall->params.rread.data, result); |
192 | if (n) { | |
193 | dprintk(DEBUG_ERROR, "Problem copying to user %d\n", n); | |
194 | kfree(fcall); | |
195 | return -EFAULT; | |
196 | } | |
197 | ||
e69e7fe5 | 198 | count -= result; |
19cba8ab | 199 | data += result; |
e69e7fe5 EVH |
200 | total += result; |
201 | ||
202 | kfree(fcall); | |
203 | ||
204 | if (result < rsize) | |
205 | break; | |
206 | } while (count); | |
207 | ||
208 | return total; | |
209 | } | |
210 | ||
211 | /** | |
19cba8ab | 212 | * v9fs_file_write - write to a file |
e69e7fe5 EVH |
213 | * @filep: file pointer to write |
214 | * @data: data buffer to write data from | |
215 | * @count: size of buffer | |
216 | * @offset: offset at which to write data | |
217 | * | |
218 | */ | |
219 | ||
220 | static ssize_t | |
19cba8ab LI |
221 | v9fs_file_write(struct file *filp, const char __user * data, |
222 | size_t count, loff_t * offset) | |
e69e7fe5 EVH |
223 | { |
224 | struct inode *inode = filp->f_dentry->d_inode; | |
225 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
226 | struct v9fs_fid *v9fid = filp->private_data; | |
227 | struct v9fs_fcall *fcall; | |
228 | int fid = v9fid->fid; | |
229 | int result = -EIO; | |
230 | int rsize = 0; | |
231 | int total = 0; | |
232 | ||
19cba8ab | 233 | dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count, |
e69e7fe5 EVH |
234 | (int)*offset); |
235 | rsize = v9ses->maxdata - V9FS_IOHDRSZ; | |
236 | if (v9fid->iounit != 0 && rsize > v9fid->iounit) | |
237 | rsize = v9fid->iounit; | |
238 | ||
e69e7fe5 EVH |
239 | do { |
240 | if (count < rsize) | |
241 | rsize = count; | |
242 | ||
531b1094 | 243 | result = v9fs_t_write(v9ses, fid, *offset, rsize, data, &fcall); |
e69e7fe5 | 244 | if (result < 0) { |
531b1094 | 245 | PRINT_FCALL_ERROR("error while writing", fcall); |
e69e7fe5 EVH |
246 | kfree(fcall); |
247 | return result; | |
248 | } else | |
249 | *offset += result; | |
250 | ||
251 | kfree(fcall); | |
19cba8ab | 252 | fcall = NULL; |
e69e7fe5 EVH |
253 | |
254 | if (result != rsize) { | |
255 | eprintk(KERN_ERR, | |
256 | "short write: v9fs_t_write returned %d\n", | |
257 | result); | |
258 | break; | |
259 | } | |
260 | ||
261 | count -= result; | |
19cba8ab | 262 | data += result; |
e69e7fe5 EVH |
263 | total += result; |
264 | } while (count); | |
265 | ||
147b31cf | 266 | invalidate_inode_pages2(inode->i_mapping); |
e69e7fe5 EVH |
267 | return total; |
268 | } | |
269 | ||
e69e7fe5 EVH |
270 | struct file_operations v9fs_file_operations = { |
271 | .llseek = generic_file_llseek, | |
272 | .read = v9fs_file_read, | |
273 | .write = v9fs_file_write, | |
274 | .open = v9fs_file_open, | |
275 | .release = v9fs_dir_release, | |
276 | .lock = v9fs_file_lock, | |
147b31cf | 277 | .mmap = generic_file_mmap, |
e69e7fe5 | 278 | }; |