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26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/file.h>
30#include <linux/stat.h>
31#include <linux/string.h>
32#include <linux/sched.h>
33#include <linux/inet.h>
34#include <linux/idr.h>
35#include <linux/slab.h>
36#include <net/9p/9p.h>
37#include <net/9p/client.h>
38
39#include "v9fs.h"
40#include "v9fs_vfs.h"
41#include "fid.h"
42
43
44
45
46
47
48
49
50
51
52
53
54struct p9_rdir {
55 struct mutex mutex;
56 int head;
57 int tail;
58 uint8_t *buf;
59};
60
61
62
63
64
65
66
67static inline int dt_type(struct p9_wstat *mistat)
68{
69 unsigned long perm = mistat->mode;
70 int rettype = DT_REG;
71
72 if (perm & P9_DMDIR)
73 rettype = DT_DIR;
74 if (perm & P9_DMSYMLINK)
75 rettype = DT_LNK;
76
77 return rettype;
78}
79
80static void p9stat_init(struct p9_wstat *stbuf)
81{
82 stbuf->name = NULL;
83 stbuf->uid = NULL;
84 stbuf->gid = NULL;
85 stbuf->muid = NULL;
86 stbuf->extension = NULL;
87}
88
89
90
91
92
93
94
95
96static int v9fs_alloc_rdir_buf(struct file *filp, int buflen)
97{
98 struct p9_rdir *rdir;
99 struct p9_fid *fid;
100 int err = 0;
101
102 fid = filp->private_data;
103 if (!fid->rdir) {
104 rdir = kmalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
105
106 if (rdir == NULL) {
107 err = -ENOMEM;
108 goto exit;
109 }
110 spin_lock(&filp->f_dentry->d_lock);
111 if (!fid->rdir) {
112 rdir->buf = (uint8_t *)rdir + sizeof(struct p9_rdir);
113 mutex_init(&rdir->mutex);
114 rdir->head = rdir->tail = 0;
115 fid->rdir = (void *) rdir;
116 rdir = NULL;
117 }
118 spin_unlock(&filp->f_dentry->d_lock);
119 kfree(rdir);
120 }
121exit:
122 return err;
123}
124
125
126
127
128
129
130
131
132
133static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
134{
135 int over;
136 struct p9_wstat st;
137 int err = 0;
138 struct p9_fid *fid;
139 int buflen;
140 int reclen = 0;
141 struct p9_rdir *rdir;
142
143 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
144 fid = filp->private_data;
145
146 buflen = fid->clnt->msize - P9_IOHDRSZ;
147
148 err = v9fs_alloc_rdir_buf(filp, buflen);
149 if (err)
150 goto exit;
151 rdir = (struct p9_rdir *) fid->rdir;
152
153 err = mutex_lock_interruptible(&rdir->mutex);
154 if (err)
155 return err;
156 while (err == 0) {
157 if (rdir->tail == rdir->head) {
158 err = v9fs_file_readn(filp, rdir->buf, NULL,
159 buflen, filp->f_pos);
160 if (err <= 0)
161 goto unlock_and_exit;
162
163 rdir->head = 0;
164 rdir->tail = err;
165 }
166 while (rdir->head < rdir->tail) {
167 p9stat_init(&st);
168 err = p9stat_read(rdir->buf + rdir->head,
169 rdir->tail - rdir->head, &st,
170 fid->clnt->proto_version);
171 if (err) {
172 P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
173 err = -EIO;
174 p9stat_free(&st);
175 goto unlock_and_exit;
176 }
177 reclen = st.size+2;
178
179 over = filldir(dirent, st.name, strlen(st.name),
180 filp->f_pos, v9fs_qid2ino(&st.qid), dt_type(&st));
181
182 p9stat_free(&st);
183
184 if (over) {
185 err = 0;
186 goto unlock_and_exit;
187 }
188 rdir->head += reclen;
189 filp->f_pos += reclen;
190 }
191 }
192
193unlock_and_exit:
194 mutex_unlock(&rdir->mutex);
195exit:
196 return err;
197}
198
199
200
201
202
203
204
205
206static int v9fs_dir_readdir_dotl(struct file *filp, void *dirent,
207 filldir_t filldir)
208{
209 int over;
210 int err = 0;
211 struct p9_fid *fid;
212 int buflen;
213 struct p9_rdir *rdir;
214 struct p9_dirent curdirent;
215 u64 oldoffset = 0;
216
217 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
218 fid = filp->private_data;
219
220 buflen = fid->clnt->msize - P9_READDIRHDRSZ;
221
222 err = v9fs_alloc_rdir_buf(filp, buflen);
223 if (err)
224 goto exit;
225 rdir = (struct p9_rdir *) fid->rdir;
226
227 err = mutex_lock_interruptible(&rdir->mutex);
228 if (err)
229 return err;
230
231 while (err == 0) {
232 if (rdir->tail == rdir->head) {
233 err = p9_client_readdir(fid, rdir->buf, buflen,
234 filp->f_pos);
235 if (err <= 0)
236 goto unlock_and_exit;
237
238 rdir->head = 0;
239 rdir->tail = err;
240 }
241
242 while (rdir->head < rdir->tail) {
243
244 err = p9dirent_read(rdir->buf + rdir->head,
245 rdir->tail - rdir->head,
246 &curdirent,
247 fid->clnt->proto_version);
248 if (err < 0) {
249 P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
250 err = -EIO;
251 goto unlock_and_exit;
252 }
253
254
255
256
257
258
259
260 over = filldir(dirent, curdirent.d_name,
261 strlen(curdirent.d_name),
262 oldoffset, v9fs_qid2ino(&curdirent.qid),
263 curdirent.d_type);
264 oldoffset = curdirent.d_off;
265
266 if (over) {
267 err = 0;
268 goto unlock_and_exit;
269 }
270
271 filp->f_pos = curdirent.d_off;
272 rdir->head += err;
273 }
274 }
275
276unlock_and_exit:
277 mutex_unlock(&rdir->mutex);
278exit:
279 return err;
280}
281
282
283
284
285
286
287
288
289
290int v9fs_dir_release(struct inode *inode, struct file *filp)
291{
292 struct p9_fid *fid;
293
294 fid = filp->private_data;
295 P9_DPRINTK(P9_DEBUG_VFS,
296 "v9fs_dir_release: inode: %p filp: %p fid: %d\n",
297 inode, filp, fid ? fid->fid : -1);
298 filemap_write_and_wait(inode->i_mapping);
299 if (fid)
300 p9_client_clunk(fid);
301 return 0;
302}
303
304const struct file_operations v9fs_dir_operations = {
305 .read = generic_read_dir,
306 .llseek = generic_file_llseek,
307 .readdir = v9fs_dir_readdir,
308 .open = v9fs_file_open,
309 .release = v9fs_dir_release,
310};
311
312const struct file_operations v9fs_dir_operations_dotl = {
313 .read = generic_read_dir,
314 .llseek = generic_file_llseek,
315 .readdir = v9fs_dir_readdir_dotl,
316 .open = v9fs_file_open,
317 .release = v9fs_dir_release,
318 .fsync = v9fs_file_fsync_dotl,
319};
320