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 | 57 | int omode; |
6a3124a3 | 58 | int err; |
e69e7fe5 | 59 | |
0b8dd177 LI |
60 | dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file); |
61 | ||
da977b2c EVH |
62 | vfid = v9fs_fid_clone(file->f_path.dentry); |
63 | if (IS_ERR(vfid)) | |
64 | return PTR_ERR(vfid); | |
6a3124a3 | 65 | |
6a3124a3 | 66 | omode = v9fs_uflags2omode(file->f_flags); |
da977b2c | 67 | err = v9fs_t_open(v9ses, vfid->fid, omode, &fcall); |
6a3124a3 LI |
68 | if (err < 0) { |
69 | PRINT_FCALL_ERROR("open failed", fcall); | |
da977b2c | 70 | goto Clunk_Fid; |
6a3124a3 | 71 | } |
e69e7fe5 | 72 | |
6a3124a3 | 73 | file->private_data = vfid; |
6a3124a3 LI |
74 | 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); | |
e69e7fe5 | 81 | |
6a3124a3 | 82 | return 0; |
e69e7fe5 | 83 | |
da977b2c EVH |
84 | Clunk_Fid: |
85 | v9fs_fid_clunk(v9ses, vfid); | |
16cce6d2 | 86 | kfree(fcall); |
e69e7fe5 | 87 | |
6a3124a3 | 88 | return err; |
e69e7fe5 EVH |
89 | } |
90 | ||
91 | /** | |
92 | * v9fs_file_lock - lock a file (or directory) | |
93 | * @inode: inode to be opened | |
94 | * @file: file being opened | |
95 | * | |
96 | * XXX - this looks like a local only lock, we should extend into 9P | |
97 | * by using open exclusive | |
98 | */ | |
99 | ||
100 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
101 | { | |
102 | int res = 0; | |
d6f787bc | 103 | struct inode *inode = filp->f_path.dentry->d_inode; |
e69e7fe5 EVH |
104 | |
105 | dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); | |
106 | ||
107 | /* No mandatory locks */ | |
108 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) | |
109 | return -ENOLCK; | |
110 | ||
111 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
28fd1298 | 112 | filemap_write_and_wait(inode->i_mapping); |
fc0ecff6 | 113 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
e69e7fe5 EVH |
114 | } |
115 | ||
116 | return res; | |
117 | } | |
118 | ||
119 | /** | |
19cba8ab | 120 | * v9fs_file_read - read from a file |
e69e7fe5 EVH |
121 | * @filep: file pointer to read |
122 | * @data: data buffer to read data into | |
123 | * @count: size of buffer | |
124 | * @offset: offset at which to read data | |
125 | * | |
126 | */ | |
e69e7fe5 | 127 | static ssize_t |
19cba8ab LI |
128 | v9fs_file_read(struct file *filp, char __user * data, size_t count, |
129 | loff_t * offset) | |
e69e7fe5 | 130 | { |
d6f787bc | 131 | struct inode *inode = filp->f_path.dentry->d_inode; |
e69e7fe5 EVH |
132 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
133 | struct v9fs_fid *v9f = filp->private_data; | |
134 | struct v9fs_fcall *fcall = NULL; | |
135 | int fid = v9f->fid; | |
136 | int rsize = 0; | |
137 | int result = 0; | |
138 | int total = 0; | |
19cba8ab | 139 | int n; |
e69e7fe5 EVH |
140 | |
141 | dprintk(DEBUG_VFS, "\n"); | |
142 | ||
143 | rsize = v9ses->maxdata - V9FS_IOHDRSZ; | |
144 | if (v9f->iounit != 0 && rsize > v9f->iounit) | |
145 | rsize = v9f->iounit; | |
146 | ||
147 | do { | |
148 | if (count < rsize) | |
149 | rsize = count; | |
150 | ||
151 | result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall); | |
152 | ||
153 | if (result < 0) { | |
154 | printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n", | |
155 | result); | |
156 | ||
157 | kfree(fcall); | |
158 | return total; | |
159 | } else | |
160 | *offset += result; | |
161 | ||
19cba8ab LI |
162 | n = copy_to_user(data, fcall->params.rread.data, result); |
163 | if (n) { | |
164 | dprintk(DEBUG_ERROR, "Problem copying to user %d\n", n); | |
165 | kfree(fcall); | |
166 | return -EFAULT; | |
167 | } | |
168 | ||
e69e7fe5 | 169 | count -= result; |
19cba8ab | 170 | data += result; |
e69e7fe5 EVH |
171 | total += result; |
172 | ||
173 | kfree(fcall); | |
174 | ||
175 | if (result < rsize) | |
176 | break; | |
177 | } while (count); | |
178 | ||
179 | return total; | |
180 | } | |
181 | ||
182 | /** | |
19cba8ab | 183 | * v9fs_file_write - write to a file |
e69e7fe5 EVH |
184 | * @filep: file pointer to write |
185 | * @data: data buffer to write data from | |
186 | * @count: size of buffer | |
187 | * @offset: offset at which to write data | |
188 | * | |
189 | */ | |
190 | ||
191 | static ssize_t | |
19cba8ab LI |
192 | v9fs_file_write(struct file *filp, const char __user * data, |
193 | size_t count, loff_t * offset) | |
e69e7fe5 | 194 | { |
d6f787bc | 195 | struct inode *inode = filp->f_path.dentry->d_inode; |
e69e7fe5 EVH |
196 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
197 | struct v9fs_fid *v9fid = filp->private_data; | |
198 | struct v9fs_fcall *fcall; | |
199 | int fid = v9fid->fid; | |
200 | int result = -EIO; | |
201 | int rsize = 0; | |
202 | int total = 0; | |
203 | ||
19cba8ab | 204 | dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count, |
e69e7fe5 EVH |
205 | (int)*offset); |
206 | rsize = v9ses->maxdata - V9FS_IOHDRSZ; | |
207 | if (v9fid->iounit != 0 && rsize > v9fid->iounit) | |
208 | rsize = v9fid->iounit; | |
209 | ||
e69e7fe5 EVH |
210 | do { |
211 | if (count < rsize) | |
212 | rsize = count; | |
213 | ||
531b1094 | 214 | result = v9fs_t_write(v9ses, fid, *offset, rsize, data, &fcall); |
e69e7fe5 | 215 | if (result < 0) { |
531b1094 | 216 | PRINT_FCALL_ERROR("error while writing", fcall); |
e69e7fe5 EVH |
217 | kfree(fcall); |
218 | return result; | |
219 | } else | |
220 | *offset += result; | |
221 | ||
222 | kfree(fcall); | |
19cba8ab | 223 | fcall = NULL; |
e69e7fe5 EVH |
224 | |
225 | if (result != rsize) { | |
226 | eprintk(KERN_ERR, | |
227 | "short write: v9fs_t_write returned %d\n", | |
228 | result); | |
229 | break; | |
230 | } | |
231 | ||
232 | count -= result; | |
19cba8ab | 233 | data += result; |
e69e7fe5 EVH |
234 | total += result; |
235 | } while (count); | |
236 | ||
fc0ecff6 | 237 | invalidate_inode_pages2(inode->i_mapping); |
e69e7fe5 EVH |
238 | return total; |
239 | } | |
240 | ||
4b6f5d20 | 241 | const struct file_operations v9fs_file_operations = { |
e69e7fe5 EVH |
242 | .llseek = generic_file_llseek, |
243 | .read = v9fs_file_read, | |
244 | .write = v9fs_file_write, | |
245 | .open = v9fs_file_open, | |
246 | .release = v9fs_dir_release, | |
247 | .lock = v9fs_file_lock, | |
147b31cf | 248 | .mmap = generic_file_mmap, |
e69e7fe5 | 249 | }; |