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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 | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
e69e7fe5 EVH |
12 | * |
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> | |
914e2637 | 29 | #include <linux/sched.h> |
e69e7fe5 EVH |
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> | |
e69e7fe5 EVH |
35 | #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 | ||
52 | int v9fs_file_open(struct inode *inode, struct file *file) | |
53 | { | |
54 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
6a3124a3 | 55 | struct v9fs_fid *vfid; |
e69e7fe5 | 56 | struct v9fs_fcall *fcall = NULL; |
6a3124a3 LI |
57 | int omode; |
58 | int fid = V9FS_NOFID; | |
59 | int err; | |
e69e7fe5 | 60 | |
0b8dd177 LI |
61 | dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file); |
62 | ||
6a3124a3 LI |
63 | vfid = v9fs_fid_lookup(file->f_dentry); |
64 | if (!vfid) { | |
e69e7fe5 | 65 | dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n"); |
0b8dd177 LI |
66 | return -EBADF; |
67 | } | |
e69e7fe5 | 68 | |
6a3124a3 LI |
69 | fid = v9fs_get_idpool(&v9ses->fidpool); |
70 | if (fid < 0) { | |
16cce6d2 LI |
71 | eprintk(KERN_WARNING, "newfid fails!\n"); |
72 | return -ENOSPC; | |
73 | } | |
e69e7fe5 | 74 | |
41e5a6ac | 75 | err = v9fs_t_walk(v9ses, vfid->fid, fid, NULL, &fcall); |
6a3124a3 | 76 | if (err < 0) { |
16cce6d2 | 77 | dprintk(DEBUG_ERROR, "rewalk didn't work\n"); |
41e5a6ac LI |
78 | if (fcall && fcall->id == RWALK) |
79 | goto clunk_fid; | |
80 | else { | |
81 | v9fs_put_idpool(fid, &v9ses->fidpool); | |
82 | goto free_fcall; | |
83 | } | |
6a3124a3 | 84 | } |
41e5a6ac | 85 | kfree(fcall); |
6a3124a3 | 86 | |
16cce6d2 LI |
87 | /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */ |
88 | /* translate open mode appropriately */ | |
6a3124a3 LI |
89 | omode = v9fs_uflags2omode(file->f_flags); |
90 | err = v9fs_t_open(v9ses, fid, omode, &fcall); | |
91 | if (err < 0) { | |
92 | PRINT_FCALL_ERROR("open failed", fcall); | |
16cce6d2 LI |
93 | goto clunk_fid; |
94 | } | |
95 | ||
96 | vfid = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL); | |
97 | if (vfid == NULL) { | |
98 | dprintk(DEBUG_ERROR, "out of memory\n"); | |
99 | err = -ENOMEM; | |
100 | goto clunk_fid; | |
6a3124a3 | 101 | } |
e69e7fe5 | 102 | |
6a3124a3 LI |
103 | file->private_data = vfid; |
104 | vfid->fid = fid; | |
105 | vfid->fidopen = 1; | |
106 | vfid->fidclunked = 0; | |
107 | vfid->iounit = fcall->params.ropen.iounit; | |
108 | vfid->rdir_pos = 0; | |
109 | vfid->rdir_fcall = NULL; | |
110 | vfid->filp = file; | |
111 | kfree(fcall); | |
e69e7fe5 | 112 | |
6a3124a3 | 113 | return 0; |
e69e7fe5 | 114 | |
6a3124a3 LI |
115 | clunk_fid: |
116 | v9fs_t_clunk(v9ses, fid); | |
e69e7fe5 | 117 | |
41e5a6ac | 118 | free_fcall: |
16cce6d2 | 119 | kfree(fcall); |
e69e7fe5 | 120 | |
6a3124a3 | 121 | return err; |
e69e7fe5 EVH |
122 | } |
123 | ||
124 | /** | |
125 | * v9fs_file_lock - lock a file (or directory) | |
126 | * @inode: inode to be opened | |
127 | * @file: file being opened | |
128 | * | |
129 | * XXX - this looks like a local only lock, we should extend into 9P | |
130 | * by using open exclusive | |
131 | */ | |
132 | ||
133 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
134 | { | |
135 | int res = 0; | |
136 | struct inode *inode = filp->f_dentry->d_inode; | |
137 | ||
138 | dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); | |
139 | ||
140 | /* No mandatory locks */ | |
141 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
142 | return -ENOLCK; | |
143 | ||
144 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
28fd1298 | 145 | filemap_write_and_wait(inode->i_mapping); |
e69e7fe5 EVH |
146 | invalidate_inode_pages(&inode->i_data); |
147 | } | |
148 | ||
149 | return res; | |
150 | } | |
151 | ||
152 | /** | |
19cba8ab | 153 | * v9fs_file_read - read from a file |
e69e7fe5 EVH |
154 | * @filep: file pointer to read |
155 | * @data: data buffer to read data into | |
156 | * @count: size of buffer | |
157 | * @offset: offset at which to read data | |
158 | * | |
159 | */ | |
e69e7fe5 | 160 | static ssize_t |
19cba8ab LI |
161 | v9fs_file_read(struct file *filp, char __user * data, size_t count, |
162 | loff_t * offset) | |
e69e7fe5 EVH |
163 | { |
164 | struct inode *inode = filp->f_dentry->d_inode; | |
165 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
166 | struct v9fs_fid *v9f = filp->private_data; | |
167 | struct v9fs_fcall *fcall = NULL; | |
168 | int fid = v9f->fid; | |
169 | int rsize = 0; | |
170 | int result = 0; | |
171 | int total = 0; | |
19cba8ab | 172 | int n; |
e69e7fe5 EVH |
173 | |
174 | dprintk(DEBUG_VFS, "\n"); | |
175 | ||
176 | rsize = v9ses->maxdata - V9FS_IOHDRSZ; | |
177 | if (v9f->iounit != 0 && rsize > v9f->iounit) | |
178 | rsize = v9f->iounit; | |
179 | ||
180 | do { | |
181 | if (count < rsize) | |
182 | rsize = count; | |
183 | ||
184 | result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall); | |
185 | ||
186 | if (result < 0) { | |
187 | printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n", | |
188 | result); | |
189 | ||
190 | kfree(fcall); | |
191 | return total; | |
192 | } else | |
193 | *offset += result; | |
194 | ||
19cba8ab LI |
195 | n = copy_to_user(data, fcall->params.rread.data, result); |
196 | if (n) { | |
197 | dprintk(DEBUG_ERROR, "Problem copying to user %d\n", n); | |
198 | kfree(fcall); | |
199 | return -EFAULT; | |
200 | } | |
201 | ||
e69e7fe5 | 202 | count -= result; |
19cba8ab | 203 | data += result; |
e69e7fe5 EVH |
204 | total += result; |
205 | ||
206 | kfree(fcall); | |
207 | ||
208 | if (result < rsize) | |
209 | break; | |
210 | } while (count); | |
211 | ||
212 | return total; | |
213 | } | |
214 | ||
215 | /** | |
19cba8ab | 216 | * v9fs_file_write - write to a file |
e69e7fe5 EVH |
217 | * @filep: file pointer to write |
218 | * @data: data buffer to write data from | |
219 | * @count: size of buffer | |
220 | * @offset: offset at which to write data | |
221 | * | |
222 | */ | |
223 | ||
224 | static ssize_t | |
19cba8ab LI |
225 | v9fs_file_write(struct file *filp, const char __user * data, |
226 | size_t count, loff_t * offset) | |
e69e7fe5 EVH |
227 | { |
228 | struct inode *inode = filp->f_dentry->d_inode; | |
229 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); | |
230 | struct v9fs_fid *v9fid = filp->private_data; | |
231 | struct v9fs_fcall *fcall; | |
232 | int fid = v9fid->fid; | |
233 | int result = -EIO; | |
234 | int rsize = 0; | |
235 | int total = 0; | |
236 | ||
19cba8ab | 237 | dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count, |
e69e7fe5 EVH |
238 | (int)*offset); |
239 | rsize = v9ses->maxdata - V9FS_IOHDRSZ; | |
240 | if (v9fid->iounit != 0 && rsize > v9fid->iounit) | |
241 | rsize = v9fid->iounit; | |
242 | ||
e69e7fe5 EVH |
243 | do { |
244 | if (count < rsize) | |
245 | rsize = count; | |
246 | ||
531b1094 | 247 | result = v9fs_t_write(v9ses, fid, *offset, rsize, data, &fcall); |
e69e7fe5 | 248 | if (result < 0) { |
531b1094 | 249 | PRINT_FCALL_ERROR("error while writing", fcall); |
e69e7fe5 EVH |
250 | kfree(fcall); |
251 | return result; | |
252 | } else | |
253 | *offset += result; | |
254 | ||
255 | kfree(fcall); | |
19cba8ab | 256 | fcall = NULL; |
e69e7fe5 EVH |
257 | |
258 | if (result != rsize) { | |
259 | eprintk(KERN_ERR, | |
260 | "short write: v9fs_t_write returned %d\n", | |
261 | result); | |
262 | break; | |
263 | } | |
264 | ||
265 | count -= result; | |
19cba8ab | 266 | data += result; |
e69e7fe5 EVH |
267 | total += result; |
268 | } while (count); | |
269 | ||
147b31cf | 270 | invalidate_inode_pages2(inode->i_mapping); |
e69e7fe5 EVH |
271 | return total; |
272 | } | |
273 | ||
4b6f5d20 | 274 | const struct file_operations v9fs_file_operations = { |
e69e7fe5 EVH |
275 | .llseek = generic_file_llseek, |
276 | .read = v9fs_file_read, | |
277 | .write = v9fs_file_write, | |
278 | .open = v9fs_file_open, | |
279 | .release = v9fs_dir_release, | |
280 | .lock = v9fs_file_lock, | |
147b31cf | 281 | .mmap = generic_file_mmap, |
e69e7fe5 | 282 | }; |