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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> | |
e69e7fe5 | 33 | #include <linux/inet.h> |
e69e7fe5 EVH |
34 | #include <linux/list.h> |
35 | #include <asm/uaccess.h> | |
36 | #include <linux/idr.h> | |
bd238fb4 LI |
37 | #include <net/9p/9p.h> |
38 | #include <net/9p/client.h> | |
e69e7fe5 | 39 | |
e69e7fe5 | 40 | #include "v9fs.h" |
e69e7fe5 EVH |
41 | #include "v9fs_vfs.h" |
42 | #include "fid.h" | |
43 | ||
d32b687e AB |
44 | static const struct file_operations v9fs_cached_file_operations; |
45 | ||
e69e7fe5 EVH |
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 | { | |
6a3124a3 | 55 | int err; |
bd238fb4 LI |
56 | struct v9fs_session_info *v9ses; |
57 | struct p9_fid *fid; | |
58 | int omode; | |
e69e7fe5 | 59 | |
bd238fb4 LI |
60 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file); |
61 | v9ses = v9fs_inode2v9ses(inode); | |
2e4bef41 | 62 | omode = v9fs_uflags2omode(file->f_flags, v9fs_extended(v9ses)); |
bd238fb4 LI |
63 | 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); | |
9523a841 | 70 | if (err < 0) { |
bd238fb4 LI |
71 | p9_client_clunk(fid); |
72 | return err; | |
73 | } | |
9523a841 EVH |
74 | if (omode & P9_OTRUNC) { |
75 | inode->i_size = 0; | |
76 | inode->i_blocks = 0; | |
77 | } | |
2e4bef41 EVH |
78 | if ((file->f_flags & O_APPEND) && (!v9fs_extended(v9ses))) |
79 | generic_file_llseek(file, 0, SEEK_END); | |
6a3124a3 | 80 | } |
e69e7fe5 | 81 | |
bd238fb4 LI |
82 | file->private_data = fid; |
83 | if ((fid->qid.version) && (v9ses->cache)) { | |
84 | P9_DPRINTK(P9_DEBUG_VFS, "cached"); | |
e03abc0c EVH |
85 | /* enable cached file options */ |
86 | if(file->f_op == &v9fs_file_operations) | |
87 | file->f_op = &v9fs_cached_file_operations; | |
88 | } | |
89 | ||
6a3124a3 | 90 | return 0; |
e69e7fe5 EVH |
91 | } |
92 | ||
93 | /** | |
94 | * v9fs_file_lock - lock a file (or directory) | |
ee443996 EVH |
95 | * @filp: file to be locked |
96 | * @cmd: lock command | |
97 | * @fl: file lock structure | |
e69e7fe5 | 98 | * |
ee443996 | 99 | * Bugs: this looks like a local only lock, we should extend into 9P |
e69e7fe5 EVH |
100 | * by using open exclusive |
101 | */ | |
102 | ||
103 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
104 | { | |
105 | int res = 0; | |
d6f787bc | 106 | struct inode *inode = filp->f_path.dentry->d_inode; |
e69e7fe5 | 107 | |
bd238fb4 | 108 | P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); |
e69e7fe5 EVH |
109 | |
110 | /* No mandatory locks */ | |
66abe5f2 | 111 | if (__mandatory_lock(inode)) |
e69e7fe5 EVH |
112 | return -ENOLCK; |
113 | ||
114 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
28fd1298 | 115 | filemap_write_and_wait(inode->i_mapping); |
fc0ecff6 | 116 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
e69e7fe5 EVH |
117 | } |
118 | ||
119 | return res; | |
120 | } | |
121 | ||
122 | /** | |
fbedadc1 | 123 | * v9fs_file_readn - read from a file |
ee443996 | 124 | * @filp: file pointer to read |
e69e7fe5 | 125 | * @data: data buffer to read data into |
fbedadc1 | 126 | * @udata: user data buffer to read data into |
e69e7fe5 EVH |
127 | * @count: size of buffer |
128 | * @offset: offset at which to read data | |
129 | * | |
130 | */ | |
fbedadc1 EVH |
131 | |
132 | ssize_t | |
133 | v9fs_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 | ||
e69e7fe5 | 174 | static ssize_t |
fbedadc1 | 175 | v9fs_file_read(struct file *filp, char __user *udata, size_t count, |
19cba8ab | 176 | loff_t * offset) |
e69e7fe5 | 177 | { |
bd238fb4 LI |
178 | int ret; |
179 | struct p9_fid *fid; | |
e69e7fe5 | 180 | |
fbedadc1 | 181 | P9_DPRINTK(P9_DEBUG_VFS, "count %d offset %lld\n", count, *offset); |
bd238fb4 | 182 | fid = filp->private_data; |
fbedadc1 EVH |
183 | |
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 | ||
bd238fb4 LI |
189 | if (ret > 0) |
190 | *offset += ret; | |
e69e7fe5 | 191 | |
bd238fb4 | 192 | return ret; |
e69e7fe5 EVH |
193 | } |
194 | ||
195 | /** | |
19cba8ab | 196 | * v9fs_file_write - write to a file |
ee443996 | 197 | * @filp: file pointer to write |
e69e7fe5 EVH |
198 | * @data: data buffer to write data from |
199 | * @count: size of buffer | |
200 | * @offset: offset at which to write data | |
201 | * | |
202 | */ | |
203 | ||
204 | static ssize_t | |
19cba8ab LI |
205 | v9fs_file_write(struct file *filp, const char __user * data, |
206 | size_t count, loff_t * offset) | |
e69e7fe5 | 207 | { |
bd238fb4 LI |
208 | int ret; |
209 | struct p9_fid *fid; | |
9523a841 | 210 | struct inode *inode = filp->f_path.dentry->d_inode; |
e69e7fe5 | 211 | |
bd238fb4 LI |
212 | P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data, |
213 | (int)count, (int)*offset); | |
e69e7fe5 | 214 | |
bd238fb4 | 215 | fid = filp->private_data; |
0fc9655e | 216 | ret = p9_client_write(fid, NULL, data, *offset, count); |
50fd8010 EVH |
217 | if (ret > 0) { |
218 | invalidate_inode_pages2_range(inode->i_mapping, *offset, | |
219 | *offset+ret); | |
bd238fb4 | 220 | *offset += ret; |
50fd8010 | 221 | } |
e69e7fe5 | 222 | |
9523a841 EVH |
223 | if (*offset > inode->i_size) { |
224 | inode->i_size = *offset; | |
225 | inode->i_blocks = (inode->i_size + 512 - 1) >> 9; | |
226 | } | |
227 | ||
bd238fb4 | 228 | return ret; |
e69e7fe5 EVH |
229 | } |
230 | ||
d32b687e | 231 | static const struct file_operations v9fs_cached_file_operations = { |
e03abc0c EVH |
232 | .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, | |
14b8869f | 239 | .mmap = generic_file_readonly_mmap, |
e03abc0c EVH |
240 | }; |
241 | ||
4b6f5d20 | 242 | const struct file_operations v9fs_file_operations = { |
e69e7fe5 EVH |
243 | .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, | |
14b8869f | 249 | .mmap = generic_file_readonly_mmap, |
e69e7fe5 | 250 | }; |