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26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/sched.h>
30#include <linux/file.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/inet.h>
34#include <linux/list.h>
35#include <linux/pagemap.h>
36#include <asm/uaccess.h>
37#include <linux/idr.h>
38#include <net/9p/9p.h>
39#include <net/9p/client.h>
40
41#include "v9fs.h"
42#include "v9fs_vfs.h"
43#include "fid.h"
44#include "cache.h"
45
46static const struct file_operations v9fs_cached_file_operations;
47
48
49
50
51
52
53
54
55int v9fs_file_open(struct inode *inode, struct file *file)
56{
57 int err;
58 struct v9fs_session_info *v9ses;
59 struct p9_fid *fid;
60 int omode;
61
62 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file);
63 v9ses = v9fs_inode2v9ses(inode);
64 omode = v9fs_uflags2omode(file->f_flags, v9fs_extended(v9ses));
65 fid = file->private_data;
66 if (!fid) {
67 fid = v9fs_fid_clone(file->f_path.dentry);
68 if (IS_ERR(fid))
69 return PTR_ERR(fid);
70
71 err = p9_client_open(fid, omode);
72 if (err < 0) {
73 p9_client_clunk(fid);
74 return err;
75 }
76 if (omode & P9_OTRUNC) {
77 i_size_write(inode, 0);
78 inode->i_blocks = 0;
79 }
80 if ((file->f_flags & O_APPEND) && (!v9fs_extended(v9ses)))
81 generic_file_llseek(file, 0, SEEK_END);
82 }
83
84 file->private_data = fid;
85 if ((fid->qid.version) && (v9ses->cache)) {
86 P9_DPRINTK(P9_DEBUG_VFS, "cached");
87
88 if(file->f_op == &v9fs_file_operations)
89 file->f_op = &v9fs_cached_file_operations;
90
91#ifdef CONFIG_9P_FSCACHE
92 v9fs_cache_inode_set_cookie(inode, file);
93#endif
94 }
95
96 return 0;
97}
98
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107
108
109static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
110{
111 int res = 0;
112 struct inode *inode = filp->f_path.dentry->d_inode;
113
114 P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
115
116
117 if (__mandatory_lock(inode))
118 return -ENOLCK;
119
120 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
121 filemap_write_and_wait(inode->i_mapping);
122 invalidate_mapping_pages(&inode->i_data, 0, -1);
123 }
124
125 return res;
126}
127
128
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133
134
135
136
137
138ssize_t
139v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
140 u64 offset)
141{
142 int n, total;
143 struct p9_fid *fid = filp->private_data;
144
145 P9_DPRINTK(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", fid->fid,
146 (long long unsigned) offset, count);
147
148 n = 0;
149 total = 0;
150 do {
151 n = p9_client_read(fid, data, udata, offset, count);
152 if (n <= 0)
153 break;
154
155 if (data)
156 data += n;
157 if (udata)
158 udata += n;
159
160 offset += n;
161 count -= n;
162 total += n;
163 } while (count > 0 && n == (fid->clnt->msize - P9_IOHDRSZ));
164
165 if (n < 0)
166 total = n;
167
168 return total;
169}
170
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179
180static ssize_t
181v9fs_file_read(struct file *filp, char __user *udata, size_t count,
182 loff_t * offset)
183{
184 int ret;
185 struct p9_fid *fid;
186
187 P9_DPRINTK(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
188 fid = filp->private_data;
189
190 if (count > (fid->clnt->msize - P9_IOHDRSZ))
191 ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
192 else
193 ret = p9_client_read(fid, NULL, udata, *offset, count);
194
195 if (ret > 0)
196 *offset += ret;
197
198 return ret;
199}
200
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208
209
210static ssize_t
211v9fs_file_write(struct file *filp, const char __user * data,
212 size_t count, loff_t * offset)
213{
214 int n, rsize, total = 0;
215 struct p9_fid *fid;
216 struct p9_client *clnt;
217 struct inode *inode = filp->f_path.dentry->d_inode;
218 int origin = *offset;
219 unsigned long pg_start, pg_end;
220
221 P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data,
222 (int)count, (int)*offset);
223
224 fid = filp->private_data;
225 clnt = fid->clnt;
226
227 rsize = fid->iounit;
228 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
229 rsize = clnt->msize - P9_IOHDRSZ;
230
231 do {
232 if (count < rsize)
233 rsize = count;
234
235 n = p9_client_write(fid, NULL, data+total, origin+total,
236 rsize);
237 if (n <= 0)
238 break;
239 count -= n;
240 total += n;
241 } while (count > 0);
242
243 if (total > 0) {
244 pg_start = origin >> PAGE_CACHE_SHIFT;
245 pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
246 if (inode->i_mapping && inode->i_mapping->nrpages)
247 invalidate_inode_pages2_range(inode->i_mapping,
248 pg_start, pg_end);
249 *offset += total;
250 i_size_write(inode, i_size_read(inode) + total);
251 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
252 }
253
254 if (n < 0)
255 return n;
256
257 return total;
258}
259
260static const struct file_operations v9fs_cached_file_operations = {
261 .llseek = generic_file_llseek,
262 .read = do_sync_read,
263 .aio_read = generic_file_aio_read,
264 .write = v9fs_file_write,
265 .open = v9fs_file_open,
266 .release = v9fs_dir_release,
267 .lock = v9fs_file_lock,
268 .mmap = generic_file_readonly_mmap,
269};
270
271const struct file_operations v9fs_file_operations = {
272 .llseek = generic_file_llseek,
273 .read = v9fs_file_read,
274 .write = v9fs_file_write,
275 .open = v9fs_file_open,
276 .release = v9fs_dir_release,
277 .lock = v9fs_file_lock,
278 .mmap = generic_file_readonly_mmap,
279};
280