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 user_namespace * mnt_userns,struct inode * dir,struct dentry * dentry,umode_t mode,bool exclusive)18 static int orangefs_create(struct user_namespace *mnt_userns,
19 struct inode *dir,
20 struct dentry *dentry,
21 umode_t mode,
22 bool exclusive)
23 {
24 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
25 struct orangefs_kernel_op_s *new_op;
26 struct orangefs_object_kref ref;
27 struct inode *inode;
28 struct iattr iattr;
29 int ret;
30
31 gossip_debug(GOSSIP_NAME_DEBUG, "%s: %pd\n",
32 __func__,
33 dentry);
34
35 new_op = op_alloc(ORANGEFS_VFS_OP_CREATE);
36 if (!new_op)
37 return -ENOMEM;
38
39 new_op->upcall.req.create.parent_refn = parent->refn;
40
41 fill_default_sys_attrs(new_op->upcall.req.create.attributes,
42 ORANGEFS_TYPE_METAFILE, mode);
43
44 strncpy(new_op->upcall.req.create.d_name,
45 dentry->d_name.name, ORANGEFS_NAME_MAX - 1);
46
47 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
48
49 gossip_debug(GOSSIP_NAME_DEBUG,
50 "%s: %pd: handle:%pU: fsid:%d: new_op:%p: ret:%d:\n",
51 __func__,
52 dentry,
53 &new_op->downcall.resp.create.refn.khandle,
54 new_op->downcall.resp.create.refn.fs_id,
55 new_op,
56 ret);
57
58 if (ret < 0)
59 goto out;
60
61 ref = new_op->downcall.resp.create.refn;
62
63 inode = orangefs_new_inode(dir->i_sb, dir, S_IFREG | mode, 0, &ref);
64 if (IS_ERR(inode)) {
65 gossip_err("%s: Failed to allocate inode for file :%pd:\n",
66 __func__,
67 dentry);
68 ret = PTR_ERR(inode);
69 goto out;
70 }
71
72 gossip_debug(GOSSIP_NAME_DEBUG,
73 "%s: Assigned inode :%pU: for file :%pd:\n",
74 __func__,
75 get_khandle_from_ino(inode),
76 dentry);
77
78 d_instantiate_new(dentry, inode);
79 orangefs_set_timeout(dentry);
80
81 gossip_debug(GOSSIP_NAME_DEBUG,
82 "%s: dentry instantiated for %pd\n",
83 __func__,
84 dentry);
85
86 memset(&iattr, 0, sizeof iattr);
87 iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
88 iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
89 __orangefs_setattr(dir, &iattr);
90 ret = 0;
91 out:
92 op_release(new_op);
93 gossip_debug(GOSSIP_NAME_DEBUG,
94 "%s: %pd: returning %d\n",
95 __func__,
96 dentry,
97 ret);
98 return ret;
99 }
100
101 /*
102 * Attempt to resolve an object name (dentry->d_name), parent handle, and
103 * fsid into a handle for the object.
104 */
orangefs_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)105 static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
106 unsigned int flags)
107 {
108 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
109 struct orangefs_kernel_op_s *new_op;
110 struct inode *inode;
111 int ret = -EINVAL;
112
113 /*
114 * in theory we could skip a lookup here (if the intent is to
115 * create) in order to avoid a potentially failed lookup, but
116 * leaving it in can skip a valid lookup and try to create a file
117 * that already exists (e.g. the vfs already handles checking for
118 * -EEXIST on O_EXCL opens, which is broken if we skip this lookup
119 * in the create path)
120 */
121 gossip_debug(GOSSIP_NAME_DEBUG, "%s called on %pd\n",
122 __func__, dentry);
123
124 if (dentry->d_name.len > (ORANGEFS_NAME_MAX - 1))
125 return ERR_PTR(-ENAMETOOLONG);
126
127 new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
128 if (!new_op)
129 return ERR_PTR(-ENOMEM);
130
131 new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
132
133 gossip_debug(GOSSIP_NAME_DEBUG, "%s:%s:%d using parent %pU\n",
134 __FILE__,
135 __func__,
136 __LINE__,
137 &parent->refn.khandle);
138 new_op->upcall.req.lookup.parent_refn = parent->refn;
139
140 strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name,
141 ORANGEFS_NAME_MAX - 1);
142
143 gossip_debug(GOSSIP_NAME_DEBUG,
144 "%s: doing lookup on %s under %pU,%d\n",
145 __func__,
146 new_op->upcall.req.lookup.d_name,
147 &new_op->upcall.req.lookup.parent_refn.khandle,
148 new_op->upcall.req.lookup.parent_refn.fs_id);
149
150 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
151
152 gossip_debug(GOSSIP_NAME_DEBUG,
153 "Lookup Got %pU, fsid %d (ret=%d)\n",
154 &new_op->downcall.resp.lookup.refn.khandle,
155 new_op->downcall.resp.lookup.refn.fs_id,
156 ret);
157
158 if (ret == 0) {
159 orangefs_set_timeout(dentry);
160 inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn);
161 } else if (ret == -ENOENT) {
162 inode = NULL;
163 } else {
164 /* must be a non-recoverable error */
165 inode = ERR_PTR(ret);
166 }
167
168 op_release(new_op);
169 return d_splice_alias(inode, dentry);
170 }
171
172 /* return 0 on success; non-zero otherwise */
orangefs_unlink(struct inode * dir,struct dentry * dentry)173 static int orangefs_unlink(struct inode *dir, struct dentry *dentry)
174 {
175 struct inode *inode = dentry->d_inode;
176 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
177 struct orangefs_kernel_op_s *new_op;
178 struct iattr iattr;
179 int ret;
180
181 gossip_debug(GOSSIP_NAME_DEBUG,
182 "%s: called on %pd\n"
183 " (inode %pU): Parent is %pU | fs_id %d\n",
184 __func__,
185 dentry,
186 get_khandle_from_ino(inode),
187 &parent->refn.khandle,
188 parent->refn.fs_id);
189
190 new_op = op_alloc(ORANGEFS_VFS_OP_REMOVE);
191 if (!new_op)
192 return -ENOMEM;
193
194 new_op->upcall.req.remove.parent_refn = parent->refn;
195 strncpy(new_op->upcall.req.remove.d_name, dentry->d_name.name,
196 ORANGEFS_NAME_MAX - 1);
197
198 ret = service_operation(new_op, "orangefs_unlink",
199 get_interruptible_flag(inode));
200
201 gossip_debug(GOSSIP_NAME_DEBUG,
202 "%s: service_operation returned:%d:\n",
203 __func__,
204 ret);
205
206 op_release(new_op);
207
208 if (!ret) {
209 drop_nlink(inode);
210
211 memset(&iattr, 0, sizeof iattr);
212 iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
213 iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
214 __orangefs_setattr(dir, &iattr);
215 }
216 return ret;
217 }
218
orangefs_symlink(struct user_namespace * mnt_userns,struct inode * dir,struct dentry * dentry,const char * symname)219 static int orangefs_symlink(struct user_namespace *mnt_userns,
220 struct inode *dir,
221 struct dentry *dentry,
222 const char *symname)
223 {
224 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
225 struct orangefs_kernel_op_s *new_op;
226 struct orangefs_object_kref ref;
227 struct inode *inode;
228 struct iattr iattr;
229 int mode = 0755;
230 int ret;
231
232 gossip_debug(GOSSIP_NAME_DEBUG, "%s: called\n", __func__);
233
234 if (!symname)
235 return -EINVAL;
236
237 if (strlen(symname)+1 > ORANGEFS_NAME_MAX)
238 return -ENAMETOOLONG;
239
240 new_op = op_alloc(ORANGEFS_VFS_OP_SYMLINK);
241 if (!new_op)
242 return -ENOMEM;
243
244 new_op->upcall.req.sym.parent_refn = parent->refn;
245
246 fill_default_sys_attrs(new_op->upcall.req.sym.attributes,
247 ORANGEFS_TYPE_SYMLINK,
248 mode);
249
250 strncpy(new_op->upcall.req.sym.entry_name,
251 dentry->d_name.name,
252 ORANGEFS_NAME_MAX - 1);
253 strncpy(new_op->upcall.req.sym.target, symname, ORANGEFS_NAME_MAX - 1);
254
255 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
256
257 gossip_debug(GOSSIP_NAME_DEBUG,
258 "Symlink Got ORANGEFS handle %pU on fsid %d (ret=%d)\n",
259 &new_op->downcall.resp.sym.refn.khandle,
260 new_op->downcall.resp.sym.refn.fs_id, ret);
261
262 if (ret < 0) {
263 gossip_debug(GOSSIP_NAME_DEBUG,
264 "%s: failed with error code %d\n",
265 __func__, ret);
266 goto out;
267 }
268
269 ref = new_op->downcall.resp.sym.refn;
270
271 inode = orangefs_new_inode(dir->i_sb, dir, S_IFLNK | mode, 0, &ref);
272 if (IS_ERR(inode)) {
273 gossip_err
274 ("*** Failed to allocate orangefs symlink inode\n");
275 ret = PTR_ERR(inode);
276 goto out;
277 }
278 /*
279 * This is necessary because orangefs_inode_getattr will not
280 * re-read symlink size as it is impossible for it to change.
281 * Invalidating the cache does not help. orangefs_new_inode
282 * does not set the correct size (it does not know symname).
283 */
284 inode->i_size = strlen(symname);
285
286 gossip_debug(GOSSIP_NAME_DEBUG,
287 "Assigned symlink inode new number of %pU\n",
288 get_khandle_from_ino(inode));
289
290 d_instantiate_new(dentry, inode);
291 orangefs_set_timeout(dentry);
292
293 gossip_debug(GOSSIP_NAME_DEBUG,
294 "Inode (Symlink) %pU -> %pd\n",
295 get_khandle_from_ino(inode),
296 dentry);
297
298 memset(&iattr, 0, sizeof iattr);
299 iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
300 iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
301 __orangefs_setattr(dir, &iattr);
302 ret = 0;
303 out:
304 op_release(new_op);
305 return ret;
306 }
307
orangefs_mkdir(struct user_namespace * mnt_userns,struct inode * dir,struct dentry * dentry,umode_t mode)308 static int orangefs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
309 struct dentry *dentry, umode_t mode)
310 {
311 struct orangefs_inode_s *parent = ORANGEFS_I(dir);
312 struct orangefs_kernel_op_s *new_op;
313 struct orangefs_object_kref ref;
314 struct inode *inode;
315 struct iattr iattr;
316 int ret;
317
318 new_op = op_alloc(ORANGEFS_VFS_OP_MKDIR);
319 if (!new_op)
320 return -ENOMEM;
321
322 new_op->upcall.req.mkdir.parent_refn = parent->refn;
323
324 fill_default_sys_attrs(new_op->upcall.req.mkdir.attributes,
325 ORANGEFS_TYPE_DIRECTORY, mode);
326
327 strncpy(new_op->upcall.req.mkdir.d_name,
328 dentry->d_name.name, ORANGEFS_NAME_MAX - 1);
329
330 ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
331
332 gossip_debug(GOSSIP_NAME_DEBUG,
333 "Mkdir Got ORANGEFS handle %pU on fsid %d\n",
334 &new_op->downcall.resp.mkdir.refn.khandle,
335 new_op->downcall.resp.mkdir.refn.fs_id);
336
337 if (ret < 0) {
338 gossip_debug(GOSSIP_NAME_DEBUG,
339 "%s: failed with error code %d\n",
340 __func__, ret);
341 goto out;
342 }
343
344 ref = new_op->downcall.resp.mkdir.refn;
345
346 inode = orangefs_new_inode(dir->i_sb, dir, S_IFDIR | mode, 0, &ref);
347 if (IS_ERR(inode)) {
348 gossip_err("*** Failed to allocate orangefs dir inode\n");
349 ret = PTR_ERR(inode);
350 goto out;
351 }
352
353 gossip_debug(GOSSIP_NAME_DEBUG,
354 "Assigned dir inode new number of %pU\n",
355 get_khandle_from_ino(inode));
356
357 d_instantiate_new(dentry, inode);
358 orangefs_set_timeout(dentry);
359
360 gossip_debug(GOSSIP_NAME_DEBUG,
361 "Inode (Directory) %pU -> %pd\n",
362 get_khandle_from_ino(inode),
363 dentry);
364
365 /*
366 * NOTE: we have no good way to keep nlink consistent for directories
367 * across clients; keep constant at 1.
368 */
369 memset(&iattr, 0, sizeof iattr);
370 iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
371 iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
372 __orangefs_setattr(dir, &iattr);
373 out:
374 op_release(new_op);
375 return ret;
376 }
377
orangefs_rename(struct user_namespace * mnt_userns,struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)378 static int orangefs_rename(struct user_namespace *mnt_userns,
379 struct inode *old_dir,
380 struct dentry *old_dentry,
381 struct inode *new_dir,
382 struct dentry *new_dentry,
383 unsigned int flags)
384 {
385 struct orangefs_kernel_op_s *new_op;
386 struct iattr iattr;
387 int ret;
388
389 if (flags)
390 return -EINVAL;
391
392 gossip_debug(GOSSIP_NAME_DEBUG,
393 "orangefs_rename: called (%pd2 => %pd2) ct=%d\n",
394 old_dentry, new_dentry, d_count(new_dentry));
395
396 memset(&iattr, 0, sizeof iattr);
397 iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
398 iattr.ia_mtime = iattr.ia_ctime = current_time(new_dir);
399 __orangefs_setattr(new_dir, &iattr);
400
401 new_op = op_alloc(ORANGEFS_VFS_OP_RENAME);
402 if (!new_op)
403 return -EINVAL;
404
405 new_op->upcall.req.rename.old_parent_refn = ORANGEFS_I(old_dir)->refn;
406 new_op->upcall.req.rename.new_parent_refn = ORANGEFS_I(new_dir)->refn;
407
408 strncpy(new_op->upcall.req.rename.d_old_name,
409 old_dentry->d_name.name,
410 ORANGEFS_NAME_MAX - 1);
411 strncpy(new_op->upcall.req.rename.d_new_name,
412 new_dentry->d_name.name,
413 ORANGEFS_NAME_MAX - 1);
414
415 ret = service_operation(new_op,
416 "orangefs_rename",
417 get_interruptible_flag(old_dentry->d_inode));
418
419 gossip_debug(GOSSIP_NAME_DEBUG,
420 "orangefs_rename: got downcall status %d\n",
421 ret);
422
423 if (new_dentry->d_inode)
424 new_dentry->d_inode->i_ctime = current_time(new_dentry->d_inode);
425
426 op_release(new_op);
427 return ret;
428 }
429
430 /* ORANGEFS implementation of VFS inode operations for directories */
431 const struct inode_operations orangefs_dir_inode_operations = {
432 .lookup = orangefs_lookup,
433 .get_acl = orangefs_get_acl,
434 .set_acl = orangefs_set_acl,
435 .create = orangefs_create,
436 .unlink = orangefs_unlink,
437 .symlink = orangefs_symlink,
438 .mkdir = orangefs_mkdir,
439 .rmdir = orangefs_unlink,
440 .rename = orangefs_rename,
441 .setattr = orangefs_setattr,
442 .getattr = orangefs_getattr,
443 .listxattr = orangefs_listxattr,
444 .permission = orangefs_permission,
445 .update_time = orangefs_update_time,
446 };
447
