1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * (C) 2001 Clemson University and The University of Chicago
4 *
5 * See COPYING in top-level directory.
6 */
7
8 /*
9 * Linux VFS namei operations.
10 */
11
12 #include "protocol.h"
13 #include "orangefs-kernel.h"
14
15 /*
16 * Get a newly allocated inode to go with a negative dentry.
17 */
orangefs_create(struct inode * dir,struct dentry * dentry,umode_t mode,bool exclusive)18 static int orangefs_create(struct inode *dir,
19 struct dentry *dentry,
20 umode_t mode,
21 bool exclusive)
22 {
23 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
24 struct orangefs_kernel_op_s *new_op;
25 struct inode *inode;
26 int ret;
27
28 gossip_debug(GOSSIP_NAME_DEBUG, "%s: %pd\n",
29 __func__,
30 dentry);
31
32 new_op = op_alloc(ORANGEFS_VFS_OP_CREATE);
33 if (!new_op)
34 return -ENOMEM;
35
36 new_op->upcall.req.create.parent_refn = parent->refn;
37
38 fill_default_sys_attrs(new_op->upcall.req.create.attributes,
39 ORANGEFS_TYPE_METAFILE, mode);
40
41 strncpy(new_op->upcall.req.create.d_name,
42 dentry->d_name.name, ORANGEFS_NAME_MAX);
43
44 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
45
46 gossip_debug(GOSSIP_NAME_DEBUG,
47 "%s: %pd: handle:%pU: fsid:%d: new_op:%p: ret:%d:\n",
48 __func__,
49 dentry,
50 &new_op->downcall.resp.create.refn.khandle,
51 new_op->downcall.resp.create.refn.fs_id,
52 new_op,
53 ret);
54
55 if (ret < 0)
56 goto out;
57
58 inode = orangefs_new_inode(dir->i_sb, dir, S_IFREG | mode, 0,
59 &new_op->downcall.resp.create.refn);
60 if (IS_ERR(inode)) {
61 gossip_err("%s: Failed to allocate inode for file :%pd:\n",
62 __func__,
63 dentry);
64 ret = PTR_ERR(inode);
65 goto out;
66 }
67
68 gossip_debug(GOSSIP_NAME_DEBUG,
69 "%s: Assigned inode :%pU: for file :%pd:\n",
70 __func__,
71 get_khandle_from_ino(inode),
72 dentry);
73
74 d_instantiate_new(dentry, inode);
75 orangefs_set_timeout(dentry);
76 ORANGEFS_I(inode)->getattr_time = jiffies - 1;
77 ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
78
79 gossip_debug(GOSSIP_NAME_DEBUG,
80 "%s: dentry instantiated for %pd\n",
81 __func__,
82 dentry);
83
84 SetMtimeFlag(parent);
85 dir->i_mtime = dir->i_ctime = current_time(dir);
86 mark_inode_dirty_sync(dir);
87 ret = 0;
88 out:
89 op_release(new_op);
90 gossip_debug(GOSSIP_NAME_DEBUG,
91 "%s: %pd: returning %d\n",
92 __func__,
93 dentry,
94 ret);
95 return ret;
96 }
97
98 /*
99 * Attempt to resolve an object name (dentry->d_name), parent handle, and
100 * fsid into a handle for the object.
101 */
orangefs_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)102 static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
103 unsigned int flags)
104 {
105 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
106 struct orangefs_kernel_op_s *new_op;
107 struct inode *inode;
108 struct dentry *res;
109 int ret = -EINVAL;
110
111 /*
112 * in theory we could skip a lookup here (if the intent is to
113 * create) in order to avoid a potentially failed lookup, but
114 * leaving it in can skip a valid lookup and try to create a file
115 * that already exists (e.g. the vfs already handles checking for
116 * -EEXIST on O_EXCL opens, which is broken if we skip this lookup
117 * in the create path)
118 */
119 gossip_debug(GOSSIP_NAME_DEBUG, "%s called on %pd\n",
120 __func__, dentry);
121
122 if (dentry->d_name.len > (ORANGEFS_NAME_MAX - 1))
123 return ERR_PTR(-ENAMETOOLONG);
124
125 new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
126 if (!new_op)
127 return ERR_PTR(-ENOMEM);
128
129 new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
130
131 gossip_debug(GOSSIP_NAME_DEBUG, "%s:%s:%d using parent %pU\n",
132 __FILE__,
133 __func__,
134 __LINE__,
135 &parent->refn.khandle);
136 new_op->upcall.req.lookup.parent_refn = parent->refn;
137
138 strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name,
139 ORANGEFS_NAME_MAX);
140
141 gossip_debug(GOSSIP_NAME_DEBUG,
142 "%s: doing lookup on %s under %pU,%d\n",
143 __func__,
144 new_op->upcall.req.lookup.d_name,
145 &new_op->upcall.req.lookup.parent_refn.khandle,
146 new_op->upcall.req.lookup.parent_refn.fs_id);
147
148 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
149
150 gossip_debug(GOSSIP_NAME_DEBUG,
151 "Lookup Got %pU, fsid %d (ret=%d)\n",
152 &new_op->downcall.resp.lookup.refn.khandle,
153 new_op->downcall.resp.lookup.refn.fs_id,
154 ret);
155
156 if (ret < 0) {
157 if (ret == -ENOENT) {
158 /*
159 * if no inode was found, add a negative dentry to
160 * dcache anyway; if we don't, we don't hold expected
161 * lookup semantics and we most noticeably break
162 * during directory renames.
163 *
164 * however, if the operation failed or exited, do not
165 * add the dentry (e.g. in the case that a touch is
166 * issued on a file that already exists that was
167 * interrupted during this lookup -- no need to add
168 * another negative dentry for an existing file)
169 */
170
171 gossip_debug(GOSSIP_NAME_DEBUG,
172 "orangefs_lookup: Adding *negative* dentry "
173 "%p for %pd\n",
174 dentry,
175 dentry);
176
177 d_add(dentry, NULL);
178 res = NULL;
179 goto out;
180 }
181
182 /* must be a non-recoverable error */
183 res = ERR_PTR(ret);
184 goto out;
185 }
186
187 orangefs_set_timeout(dentry);
188
189 inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn);
190 if (IS_ERR(inode)) {
191 gossip_debug(GOSSIP_NAME_DEBUG,
192 "error %ld from iget\n", PTR_ERR(inode));
193 res = ERR_CAST(inode);
194 goto out;
195 }
196
197 gossip_debug(GOSSIP_NAME_DEBUG,
198 "%s:%s:%d "
199 "Found good inode [%lu] with count [%d]\n",
200 __FILE__,
201 __func__,
202 __LINE__,
203 inode->i_ino,
204 (int)atomic_read(&inode->i_count));
205
206 /* update dentry/inode pair into dcache */
207 res = d_splice_alias(inode, dentry);
208
209 gossip_debug(GOSSIP_NAME_DEBUG,
210 "Lookup success (inode ct = %d)\n",
211 (int)atomic_read(&inode->i_count));
212 out:
213 op_release(new_op);
214 return res;
215 }
216
217 /* return 0 on success; non-zero otherwise */
orangefs_unlink(struct inode * dir,struct dentry * dentry)218 static int orangefs_unlink(struct inode *dir, struct dentry *dentry)
219 {
220 struct inode *inode = dentry->d_inode;
221 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
222 struct orangefs_kernel_op_s *new_op;
223 int ret;
224
225 gossip_debug(GOSSIP_NAME_DEBUG,
226 "%s: called on %pd\n"
227 " (inode %pU): Parent is %pU | fs_id %d\n",
228 __func__,
229 dentry,
230 get_khandle_from_ino(inode),
231 &parent->refn.khandle,
232 parent->refn.fs_id);
233
234 new_op = op_alloc(ORANGEFS_VFS_OP_REMOVE);
235 if (!new_op)
236 return -ENOMEM;
237
238 new_op->upcall.req.remove.parent_refn = parent->refn;
239 strncpy(new_op->upcall.req.remove.d_name, dentry->d_name.name,
240 ORANGEFS_NAME_MAX);
241
242 ret = service_operation(new_op, "orangefs_unlink",
243 get_interruptible_flag(inode));
244
245 gossip_debug(GOSSIP_NAME_DEBUG,
246 "%s: service_operation returned:%d:\n",
247 __func__,
248 ret);
249
250 op_release(new_op);
251
252 if (!ret) {
253 drop_nlink(inode);
254
255 SetMtimeFlag(parent);
256 dir->i_mtime = dir->i_ctime = current_time(dir);
257 mark_inode_dirty_sync(dir);
258 }
259 return ret;
260 }
261
orangefs_symlink(struct inode * dir,struct dentry * dentry,const char * symname)262 static int orangefs_symlink(struct inode *dir,
263 struct dentry *dentry,
264 const char *symname)
265 {
266 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
267 struct orangefs_kernel_op_s *new_op;
268 struct inode *inode;
269 int mode = 755;
270 int ret;
271
272 gossip_debug(GOSSIP_NAME_DEBUG, "%s: called\n", __func__);
273
274 if (!symname)
275 return -EINVAL;
276
277 if (strlen(symname)+1 > ORANGEFS_NAME_MAX)
278 return -ENAMETOOLONG;
279
280 new_op = op_alloc(ORANGEFS_VFS_OP_SYMLINK);
281 if (!new_op)
282 return -ENOMEM;
283
284 new_op->upcall.req.sym.parent_refn = parent->refn;
285
286 fill_default_sys_attrs(new_op->upcall.req.sym.attributes,
287 ORANGEFS_TYPE_SYMLINK,
288 mode);
289
290 strncpy(new_op->upcall.req.sym.entry_name,
291 dentry->d_name.name,
292 ORANGEFS_NAME_MAX);
293 strncpy(new_op->upcall.req.sym.target, symname, ORANGEFS_NAME_MAX);
294
295 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
296
297 gossip_debug(GOSSIP_NAME_DEBUG,
298 "Symlink Got ORANGEFS handle %pU on fsid %d (ret=%d)\n",
299 &new_op->downcall.resp.sym.refn.khandle,
300 new_op->downcall.resp.sym.refn.fs_id, ret);
301
302 if (ret < 0) {
303 gossip_debug(GOSSIP_NAME_DEBUG,
304 "%s: failed with error code %d\n",
305 __func__, ret);
306 goto out;
307 }
308
309 inode = orangefs_new_inode(dir->i_sb, dir, S_IFLNK | mode, 0,
310 &new_op->downcall.resp.sym.refn);
311 if (IS_ERR(inode)) {
312 gossip_err
313 ("*** Failed to allocate orangefs symlink inode\n");
314 ret = PTR_ERR(inode);
315 goto out;
316 }
317 /*
318 * This is necessary because orangefs_inode_getattr will not
319 * re-read symlink size as it is impossible for it to change.
320 * Invalidating the cache does not help. orangefs_new_inode
321 * does not set the correct size (it does not know symname).
322 */
323 inode->i_size = strlen(symname);
324
325 gossip_debug(GOSSIP_NAME_DEBUG,
326 "Assigned symlink inode new number of %pU\n",
327 get_khandle_from_ino(inode));
328
329 d_instantiate_new(dentry, inode);
330 orangefs_set_timeout(dentry);
331 ORANGEFS_I(inode)->getattr_time = jiffies - 1;
332 ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
333
334 gossip_debug(GOSSIP_NAME_DEBUG,
335 "Inode (Symlink) %pU -> %pd\n",
336 get_khandle_from_ino(inode),
337 dentry);
338
339 SetMtimeFlag(parent);
340 dir->i_mtime = dir->i_ctime = current_time(dir);
341 mark_inode_dirty_sync(dir);
342 ret = 0;
343 out:
344 op_release(new_op);
345 return ret;
346 }
347
orangefs_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)348 static int orangefs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
349 {
350 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
351 struct orangefs_kernel_op_s *new_op;
352 struct inode *inode;
353 int ret;
354
355 new_op = op_alloc(ORANGEFS_VFS_OP_MKDIR);
356 if (!new_op)
357 return -ENOMEM;
358
359 new_op->upcall.req.mkdir.parent_refn = parent->refn;
360
361 fill_default_sys_attrs(new_op->upcall.req.mkdir.attributes,
362 ORANGEFS_TYPE_DIRECTORY, mode);
363
364 strncpy(new_op->upcall.req.mkdir.d_name,
365 dentry->d_name.name, ORANGEFS_NAME_MAX);
366
367 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
368
369 gossip_debug(GOSSIP_NAME_DEBUG,
370 "Mkdir Got ORANGEFS handle %pU on fsid %d\n",
371 &new_op->downcall.resp.mkdir.refn.khandle,
372 new_op->downcall.resp.mkdir.refn.fs_id);
373
374 if (ret < 0) {
375 gossip_debug(GOSSIP_NAME_DEBUG,
376 "%s: failed with error code %d\n",
377 __func__, ret);
378 goto out;
379 }
380
381 inode = orangefs_new_inode(dir->i_sb, dir, S_IFDIR | mode, 0,
382 &new_op->downcall.resp.mkdir.refn);
383 if (IS_ERR(inode)) {
384 gossip_err("*** Failed to allocate orangefs dir inode\n");
385 ret = PTR_ERR(inode);
386 goto out;
387 }
388
389 gossip_debug(GOSSIP_NAME_DEBUG,
390 "Assigned dir inode new number of %pU\n",
391 get_khandle_from_ino(inode));
392
393 d_instantiate_new(dentry, inode);
394 orangefs_set_timeout(dentry);
395 ORANGEFS_I(inode)->getattr_time = jiffies - 1;
396 ORANGEFS_I(inode)->getattr_mask = STATX_BASIC_STATS;
397
398 gossip_debug(GOSSIP_NAME_DEBUG,
399 "Inode (Directory) %pU -> %pd\n",
400 get_khandle_from_ino(inode),
401 dentry);
402
403 /*
404 * NOTE: we have no good way to keep nlink consistent for directories
405 * across clients; keep constant at 1.
406 */
407 SetMtimeFlag(parent);
408 dir->i_mtime = dir->i_ctime = current_time(dir);
409 mark_inode_dirty_sync(dir);
410 out:
411 op_release(new_op);
412 return ret;
413 }
414
orangefs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)415 static int orangefs_rename(struct inode *old_dir,
416 struct dentry *old_dentry,
417 struct inode *new_dir,
418 struct dentry *new_dentry,
419 unsigned int flags)
420 {
421 struct orangefs_kernel_op_s *new_op;
422 int ret;
423
424 if (flags)
425 return -EINVAL;
426
427 gossip_debug(GOSSIP_NAME_DEBUG,
428 "orangefs_rename: called (%pd2 => %pd2) ct=%d\n",
429 old_dentry, new_dentry, d_count(new_dentry));
430
431 ORANGEFS_I(new_dentry->d_parent->d_inode)->getattr_time = jiffies - 1;
432
433 new_op = op_alloc(ORANGEFS_VFS_OP_RENAME);
434 if (!new_op)
435 return -EINVAL;
436
437 new_op->upcall.req.rename.old_parent_refn = ORANGEFS_I(old_dir)->refn;
438 new_op->upcall.req.rename.new_parent_refn = ORANGEFS_I(new_dir)->refn;
439
440 strncpy(new_op->upcall.req.rename.d_old_name,
441 old_dentry->d_name.name,
442 ORANGEFS_NAME_MAX);
443 strncpy(new_op->upcall.req.rename.d_new_name,
444 new_dentry->d_name.name,
445 ORANGEFS_NAME_MAX);
446
447 ret = service_operation(new_op,
448 "orangefs_rename",
449 get_interruptible_flag(old_dentry->d_inode));
450
451 gossip_debug(GOSSIP_NAME_DEBUG,
452 "orangefs_rename: got downcall status %d\n",
453 ret);
454
455 if (new_dentry->d_inode)
456 new_dentry->d_inode->i_ctime = current_time(new_dentry->d_inode);
457
458 op_release(new_op);
459 return ret;
460 }
461
462 /* ORANGEFS implementation of VFS inode operations for directories */
463 const struct inode_operations orangefs_dir_inode_operations = {
464 .lookup = orangefs_lookup,
465 .get_acl = orangefs_get_acl,
466 .set_acl = orangefs_set_acl,
467 .create = orangefs_create,
468 .unlink = orangefs_unlink,
469 .symlink = orangefs_symlink,
470 .mkdir = orangefs_mkdir,
471 .rmdir = orangefs_unlink,
472 .rename = orangefs_rename,
473 .setattr = orangefs_setattr,
474 .getattr = orangefs_getattr,
475 .listxattr = orangefs_listxattr,
476 .permission = orangefs_permission,
477 };
478