1 /*
2 * (C) 2001 Clemson University and The University of Chicago
3 *
4 * See COPYING in top-level directory.
5 */
6
7 /*
8 * Linux VFS namei operations.
9 */
10
11 #include "protocol.h"
12 #include "orangefs-kernel.h"
13
14 /*
15 * Get a newly allocated inode to go with a negative dentry.
16 */
orangefs_create(struct inode * dir,struct dentry * dentry,umode_t mode,bool exclusive)17 static int orangefs_create(struct inode *dir,
18 struct dentry *dentry,
19 umode_t mode,
20 bool exclusive)
21 {
22 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
23 struct orangefs_kernel_op_s *new_op;
24 struct inode *inode;
25 int ret;
26
27 gossip_debug(GOSSIP_NAME_DEBUG, "%s: %pd\n",
28 __func__,
29 dentry);
30
31 new_op = op_alloc(ORANGEFS_VFS_OP_CREATE);
32 if (!new_op)
33 return -ENOMEM;
34
35 new_op->upcall.req.create.parent_refn = parent->refn;
36
37 fill_default_sys_attrs(new_op->upcall.req.create.attributes,
38 ORANGEFS_TYPE_METAFILE, mode);
39
40 strncpy(new_op->upcall.req.create.d_name,
41 dentry->d_name.name, ORANGEFS_NAME_MAX);
42
43 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
44
45 gossip_debug(GOSSIP_NAME_DEBUG,
46 "%s: %pd: handle:%pU: fsid:%d: new_op:%p: ret:%d:\n",
47 __func__,
48 dentry,
49 &new_op->downcall.resp.create.refn.khandle,
50 new_op->downcall.resp.create.refn.fs_id,
51 new_op,
52 ret);
53
54 if (ret < 0)
55 goto out;
56
57 inode = orangefs_new_inode(dir->i_sb, dir, S_IFREG | mode, 0,
58 &new_op->downcall.resp.create.refn);
59 if (IS_ERR(inode)) {
60 gossip_err("%s: Failed to allocate inode for file :%pd:\n",
61 __func__,
62 dentry);
63 ret = PTR_ERR(inode);
64 goto out;
65 }
66
67 gossip_debug(GOSSIP_NAME_DEBUG,
68 "%s: Assigned inode :%pU: for file :%pd:\n",
69 __func__,
70 get_khandle_from_ino(inode),
71 dentry);
72
73 d_instantiate(dentry, inode);
74 unlock_new_inode(inode);
75 orangefs_set_timeout(dentry);
76 ORANGEFS_I(inode)->getattr_time = jiffies - 1;
77
78 gossip_debug(GOSSIP_NAME_DEBUG,
79 "%s: dentry instantiated for %pd\n",
80 __func__,
81 dentry);
82
83 SetMtimeFlag(parent);
84 dir->i_mtime = dir->i_ctime = current_time(dir);
85 mark_inode_dirty_sync(dir);
86 ret = 0;
87 out:
88 op_release(new_op);
89 gossip_debug(GOSSIP_NAME_DEBUG,
90 "%s: %pd: returning %d\n",
91 __func__,
92 dentry,
93 ret);
94 return ret;
95 }
96
97 /*
98 * Attempt to resolve an object name (dentry->d_name), parent handle, and
99 * fsid into a handle for the object.
100 */
orangefs_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)101 static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
102 unsigned int flags)
103 {
104 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
105 struct orangefs_kernel_op_s *new_op;
106 struct inode *inode;
107 struct dentry *res;
108 int ret = -EINVAL;
109
110 /*
111 * in theory we could skip a lookup here (if the intent is to
112 * create) in order to avoid a potentially failed lookup, but
113 * leaving it in can skip a valid lookup and try to create a file
114 * that already exists (e.g. the vfs already handles checking for
115 * -EEXIST on O_EXCL opens, which is broken if we skip this lookup
116 * in the create path)
117 */
118 gossip_debug(GOSSIP_NAME_DEBUG, "%s called on %pd\n",
119 __func__, dentry);
120
121 if (dentry->d_name.len > (ORANGEFS_NAME_MAX - 1))
122 return ERR_PTR(-ENAMETOOLONG);
123
124 new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
125 if (!new_op)
126 return ERR_PTR(-ENOMEM);
127
128 new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
129
130 gossip_debug(GOSSIP_NAME_DEBUG, "%s:%s:%d using parent %pU\n",
131 __FILE__,
132 __func__,
133 __LINE__,
134 &parent->refn.khandle);
135 new_op->upcall.req.lookup.parent_refn = parent->refn;
136
137 strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name,
138 ORANGEFS_NAME_MAX);
139
140 gossip_debug(GOSSIP_NAME_DEBUG,
141 "%s: doing lookup on %s under %pU,%d\n",
142 __func__,
143 new_op->upcall.req.lookup.d_name,
144 &new_op->upcall.req.lookup.parent_refn.khandle,
145 new_op->upcall.req.lookup.parent_refn.fs_id);
146
147 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
148
149 gossip_debug(GOSSIP_NAME_DEBUG,
150 "Lookup Got %pU, fsid %d (ret=%d)\n",
151 &new_op->downcall.resp.lookup.refn.khandle,
152 new_op->downcall.resp.lookup.refn.fs_id,
153 ret);
154
155 if (ret < 0) {
156 if (ret == -ENOENT) {
157 /*
158 * if no inode was found, add a negative dentry to
159 * dcache anyway; if we don't, we don't hold expected
160 * lookup semantics and we most noticeably break
161 * during directory renames.
162 *
163 * however, if the operation failed or exited, do not
164 * add the dentry (e.g. in the case that a touch is
165 * issued on a file that already exists that was
166 * interrupted during this lookup -- no need to add
167 * another negative dentry for an existing file)
168 */
169
170 gossip_debug(GOSSIP_NAME_DEBUG,
171 "orangefs_lookup: Adding *negative* dentry "
172 "%p for %pd\n",
173 dentry,
174 dentry);
175
176 d_add(dentry, NULL);
177 res = NULL;
178 goto out;
179 }
180
181 /* must be a non-recoverable error */
182 res = ERR_PTR(ret);
183 goto out;
184 }
185
186 orangefs_set_timeout(dentry);
187
188 inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn);
189 if (IS_ERR(inode)) {
190 gossip_debug(GOSSIP_NAME_DEBUG,
191 "error %ld from iget\n", PTR_ERR(inode));
192 res = ERR_CAST(inode);
193 goto out;
194 }
195
196 gossip_debug(GOSSIP_NAME_DEBUG,
197 "%s:%s:%d "
198 "Found good inode [%lu] with count [%d]\n",
199 __FILE__,
200 __func__,
201 __LINE__,
202 inode->i_ino,
203 (int)atomic_read(&inode->i_count));
204
205 /* update dentry/inode pair into dcache */
206 res = d_splice_alias(inode, dentry);
207
208 gossip_debug(GOSSIP_NAME_DEBUG,
209 "Lookup success (inode ct = %d)\n",
210 (int)atomic_read(&inode->i_count));
211 out:
212 op_release(new_op);
213 return res;
214 }
215
216 /* return 0 on success; non-zero otherwise */
orangefs_unlink(struct inode * dir,struct dentry * dentry)217 static int orangefs_unlink(struct inode *dir, struct dentry *dentry)
218 {
219 struct inode *inode = dentry->d_inode;
220 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
221 struct orangefs_kernel_op_s *new_op;
222 int ret;
223
224 gossip_debug(GOSSIP_NAME_DEBUG,
225 "%s: called on %pd\n"
226 " (inode %pU): Parent is %pU | fs_id %d\n",
227 __func__,
228 dentry,
229 get_khandle_from_ino(inode),
230 &parent->refn.khandle,
231 parent->refn.fs_id);
232
233 new_op = op_alloc(ORANGEFS_VFS_OP_REMOVE);
234 if (!new_op)
235 return -ENOMEM;
236
237 new_op->upcall.req.remove.parent_refn = parent->refn;
238 strncpy(new_op->upcall.req.remove.d_name, dentry->d_name.name,
239 ORANGEFS_NAME_MAX);
240
241 ret = service_operation(new_op, "orangefs_unlink",
242 get_interruptible_flag(inode));
243
244 gossip_debug(GOSSIP_NAME_DEBUG,
245 "%s: service_operation returned:%d:\n",
246 __func__,
247 ret);
248
249 op_release(new_op);
250
251 if (!ret) {
252 drop_nlink(inode);
253
254 SetMtimeFlag(parent);
255 dir->i_mtime = dir->i_ctime = current_time(dir);
256 mark_inode_dirty_sync(dir);
257 }
258 return ret;
259 }
260
orangefs_symlink(struct inode * dir,struct dentry * dentry,const char * symname)261 static int orangefs_symlink(struct inode *dir,
262 struct dentry *dentry,
263 const char *symname)
264 {
265 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
266 struct orangefs_kernel_op_s *new_op;
267 struct inode *inode;
268 int mode = 755;
269 int ret;
270
271 gossip_debug(GOSSIP_NAME_DEBUG, "%s: called\n", __func__);
272
273 if (!symname)
274 return -EINVAL;
275
276 if (strlen(symname)+1 > ORANGEFS_NAME_MAX)
277 return -ENAMETOOLONG;
278
279 new_op = op_alloc(ORANGEFS_VFS_OP_SYMLINK);
280 if (!new_op)
281 return -ENOMEM;
282
283 new_op->upcall.req.sym.parent_refn = parent->refn;
284
285 fill_default_sys_attrs(new_op->upcall.req.sym.attributes,
286 ORANGEFS_TYPE_SYMLINK,
287 mode);
288
289 strncpy(new_op->upcall.req.sym.entry_name,
290 dentry->d_name.name,
291 ORANGEFS_NAME_MAX);
292 strncpy(new_op->upcall.req.sym.target, symname, ORANGEFS_NAME_MAX);
293
294 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
295
296 gossip_debug(GOSSIP_NAME_DEBUG,
297 "Symlink Got ORANGEFS handle %pU on fsid %d (ret=%d)\n",
298 &new_op->downcall.resp.sym.refn.khandle,
299 new_op->downcall.resp.sym.refn.fs_id, ret);
300
301 if (ret < 0) {
302 gossip_debug(GOSSIP_NAME_DEBUG,
303 "%s: failed with error code %d\n",
304 __func__, ret);
305 goto out;
306 }
307
308 inode = orangefs_new_inode(dir->i_sb, dir, S_IFLNK | mode, 0,
309 &new_op->downcall.resp.sym.refn);
310 if (IS_ERR(inode)) {
311 gossip_err
312 ("*** Failed to allocate orangefs symlink inode\n");
313 ret = PTR_ERR(inode);
314 goto out;
315 }
316
317 gossip_debug(GOSSIP_NAME_DEBUG,
318 "Assigned symlink inode new number of %pU\n",
319 get_khandle_from_ino(inode));
320
321 d_instantiate(dentry, inode);
322 unlock_new_inode(inode);
323 orangefs_set_timeout(dentry);
324 ORANGEFS_I(inode)->getattr_time = jiffies - 1;
325
326 gossip_debug(GOSSIP_NAME_DEBUG,
327 "Inode (Symlink) %pU -> %pd\n",
328 get_khandle_from_ino(inode),
329 dentry);
330
331 SetMtimeFlag(parent);
332 dir->i_mtime = dir->i_ctime = current_time(dir);
333 mark_inode_dirty_sync(dir);
334 ret = 0;
335 out:
336 op_release(new_op);
337 return ret;
338 }
339
orangefs_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)340 static int orangefs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
341 {
342 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
343 struct orangefs_kernel_op_s *new_op;
344 struct inode *inode;
345 int ret;
346
347 new_op = op_alloc(ORANGEFS_VFS_OP_MKDIR);
348 if (!new_op)
349 return -ENOMEM;
350
351 new_op->upcall.req.mkdir.parent_refn = parent->refn;
352
353 fill_default_sys_attrs(new_op->upcall.req.mkdir.attributes,
354 ORANGEFS_TYPE_DIRECTORY, mode);
355
356 strncpy(new_op->upcall.req.mkdir.d_name,
357 dentry->d_name.name, ORANGEFS_NAME_MAX);
358
359 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
360
361 gossip_debug(GOSSIP_NAME_DEBUG,
362 "Mkdir Got ORANGEFS handle %pU on fsid %d\n",
363 &new_op->downcall.resp.mkdir.refn.khandle,
364 new_op->downcall.resp.mkdir.refn.fs_id);
365
366 if (ret < 0) {
367 gossip_debug(GOSSIP_NAME_DEBUG,
368 "%s: failed with error code %d\n",
369 __func__, ret);
370 goto out;
371 }
372
373 inode = orangefs_new_inode(dir->i_sb, dir, S_IFDIR | mode, 0,
374 &new_op->downcall.resp.mkdir.refn);
375 if (IS_ERR(inode)) {
376 gossip_err("*** Failed to allocate orangefs dir inode\n");
377 ret = PTR_ERR(inode);
378 goto out;
379 }
380
381 gossip_debug(GOSSIP_NAME_DEBUG,
382 "Assigned dir inode new number of %pU\n",
383 get_khandle_from_ino(inode));
384
385 d_instantiate(dentry, inode);
386 unlock_new_inode(inode);
387 orangefs_set_timeout(dentry);
388 ORANGEFS_I(inode)->getattr_time = jiffies - 1;
389
390 gossip_debug(GOSSIP_NAME_DEBUG,
391 "Inode (Directory) %pU -> %pd\n",
392 get_khandle_from_ino(inode),
393 dentry);
394
395 /*
396 * NOTE: we have no good way to keep nlink consistent for directories
397 * across clients; keep constant at 1.
398 */
399 SetMtimeFlag(parent);
400 dir->i_mtime = dir->i_ctime = current_time(dir);
401 mark_inode_dirty_sync(dir);
402 out:
403 op_release(new_op);
404 return ret;
405 }
406
orangefs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)407 static int orangefs_rename(struct inode *old_dir,
408 struct dentry *old_dentry,
409 struct inode *new_dir,
410 struct dentry *new_dentry,
411 unsigned int flags)
412 {
413 struct orangefs_kernel_op_s *new_op;
414 int ret;
415
416 if (flags)
417 return -EINVAL;
418
419 gossip_debug(GOSSIP_NAME_DEBUG,
420 "orangefs_rename: called (%pd2 => %pd2) ct=%d\n",
421 old_dentry, new_dentry, d_count(new_dentry));
422
423 ORANGEFS_I(new_dentry->d_parent->d_inode)->getattr_time = jiffies - 1;
424
425 new_op = op_alloc(ORANGEFS_VFS_OP_RENAME);
426 if (!new_op)
427 return -EINVAL;
428
429 new_op->upcall.req.rename.old_parent_refn = ORANGEFS_I(old_dir)->refn;
430 new_op->upcall.req.rename.new_parent_refn = ORANGEFS_I(new_dir)->refn;
431
432 strncpy(new_op->upcall.req.rename.d_old_name,
433 old_dentry->d_name.name,
434 ORANGEFS_NAME_MAX);
435 strncpy(new_op->upcall.req.rename.d_new_name,
436 new_dentry->d_name.name,
437 ORANGEFS_NAME_MAX);
438
439 ret = service_operation(new_op,
440 "orangefs_rename",
441 get_interruptible_flag(old_dentry->d_inode));
442
443 gossip_debug(GOSSIP_NAME_DEBUG,
444 "orangefs_rename: got downcall status %d\n",
445 ret);
446
447 if (new_dentry->d_inode)
448 new_dentry->d_inode->i_ctime = current_time(new_dentry->d_inode);
449
450 op_release(new_op);
451 return ret;
452 }
453
454 /* ORANGEFS implementation of VFS inode operations for directories */
455 const struct inode_operations orangefs_dir_inode_operations = {
456 .lookup = orangefs_lookup,
457 .get_acl = orangefs_get_acl,
458 .set_acl = orangefs_set_acl,
459 .create = orangefs_create,
460 .unlink = orangefs_unlink,
461 .symlink = orangefs_symlink,
462 .mkdir = orangefs_mkdir,
463 .rmdir = orangefs_unlink,
464 .rename = orangefs_rename,
465 .setattr = orangefs_setattr,
466 .getattr = orangefs_getattr,
467 .listxattr = orangefs_listxattr,
468 .permission = orangefs_permission,
469 };
470