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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(fid->clnt, rdir->buf + rdir->head,
169 rdir->tail - rdir->head, &st);
170 if (err) {
171 P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
172 err = -EIO;
173 p9stat_free(&st);
174 goto unlock_and_exit;
175 }
176 reclen = st.size+2;
177
178 over = filldir(dirent, st.name, strlen(st.name),
179 filp->f_pos, v9fs_qid2ino(&st.qid), dt_type(&st));
180
181 p9stat_free(&st);
182
183 if (over) {
184 err = 0;
185 goto unlock_and_exit;
186 }
187 rdir->head += reclen;
188 filp->f_pos += reclen;
189 }
190 }
191
192unlock_and_exit:
193 mutex_unlock(&rdir->mutex);
194exit:
195 return err;
196}
197
198
199
200
201
202
203
204
205static int v9fs_dir_readdir_dotl(struct file *filp, void *dirent,
206 filldir_t filldir)
207{
208 int over;
209 int err = 0;
210 struct p9_fid *fid;
211 int buflen;
212 struct p9_rdir *rdir;
213 struct p9_dirent curdirent;
214 u64 oldoffset = 0;
215
216 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
217 fid = filp->private_data;
218
219 buflen = fid->clnt->msize - P9_READDIRHDRSZ;
220
221 err = v9fs_alloc_rdir_buf(filp, buflen);
222 if (err)
223 goto exit;
224 rdir = (struct p9_rdir *) fid->rdir;
225
226 err = mutex_lock_interruptible(&rdir->mutex);
227 if (err)
228 return err;
229
230 while (err == 0) {
231 if (rdir->tail == rdir->head) {
232 err = p9_client_readdir(fid, rdir->buf, buflen,
233 filp->f_pos);
234 if (err <= 0)
235 goto unlock_and_exit;
236
237 rdir->head = 0;
238 rdir->tail = err;
239 }
240
241 while (rdir->head < rdir->tail) {
242
243 err = p9dirent_read(fid->clnt, rdir->buf + rdir->head,
244 rdir->tail - rdir->head,
245 &curdirent);
246 if (err < 0) {
247 P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
248 err = -EIO;
249 goto unlock_and_exit;
250 }
251
252
253
254
255
256
257
258 over = filldir(dirent, curdirent.d_name,
259 strlen(curdirent.d_name),
260 oldoffset, v9fs_qid2ino(&curdirent.qid),
261 curdirent.d_type);
262 oldoffset = curdirent.d_off;
263
264 if (over) {
265 err = 0;
266 goto unlock_and_exit;
267 }
268
269 filp->f_pos = curdirent.d_off;
270 rdir->head += err;
271 }
272 }
273
274unlock_and_exit:
275 mutex_unlock(&rdir->mutex);
276exit:
277 return err;
278}
279
280
281
282
283
284
285
286
287
288int v9fs_dir_release(struct inode *inode, struct file *filp)
289{
290 struct p9_fid *fid;
291
292 fid = filp->private_data;
293 P9_DPRINTK(P9_DEBUG_VFS,
294 "v9fs_dir_release: inode: %p filp: %p fid: %d\n",
295 inode, filp, fid ? fid->fid : -1);
296 if (fid)
297 p9_client_clunk(fid);
298 return 0;
299}
300
301const struct file_operations v9fs_dir_operations = {
302 .read = generic_read_dir,
303 .llseek = generic_file_llseek,
304 .readdir = v9fs_dir_readdir,
305 .open = v9fs_file_open,
306 .release = v9fs_dir_release,
307};
308
309const struct file_operations v9fs_dir_operations_dotl = {
310 .read = generic_read_dir,
311 .llseek = generic_file_llseek,
312 .readdir = v9fs_dir_readdir_dotl,
313 .open = v9fs_file_open,
314 .release = v9fs_dir_release,
315 .fsync = v9fs_file_fsync_dotl,
316};
317