xref: /linux/fs/orangefs/namei.c (revision 52338415) 
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  */
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 orangefs_object_kref ref;
26 	struct inode *inode;
27 	struct iattr iattr;
28 	int ret;
29 
30 	gossip_debug(GOSSIP_NAME_DEBUG, "%s: %pd\n",
31 		     __func__,
32 		     dentry);
33 
34 	new_op = op_alloc(ORANGEFS_VFS_OP_CREATE);
35 	if (!new_op)
36 		return -ENOMEM;
37 
38 	new_op->upcall.req.create.parent_refn = parent->refn;
39 
40 	fill_default_sys_attrs(new_op->upcall.req.create.attributes,
41 			       ORANGEFS_TYPE_METAFILE, mode);
42 
43 	strncpy(new_op->upcall.req.create.d_name,
44 		dentry->d_name.name, ORANGEFS_NAME_MAX - 1);
45 
46 	ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
47 
48 	gossip_debug(GOSSIP_NAME_DEBUG,
49 		     "%s: %pd: handle:%pU: fsid:%d: new_op:%p: ret:%d:\n",
50 		     __func__,
51 		     dentry,
52 		     &new_op->downcall.resp.create.refn.khandle,
53 		     new_op->downcall.resp.create.refn.fs_id,
54 		     new_op,
55 		     ret);
56 
57 	if (ret < 0)
58 		goto out;
59 
60 	ref = new_op->downcall.resp.create.refn;
61 
62 	inode = orangefs_new_inode(dir->i_sb, dir, S_IFREG | mode, 0, &ref);
63 	if (IS_ERR(inode)) {
64 		gossip_err("%s: Failed to allocate inode for file :%pd:\n",
65 			   __func__,
66 			   dentry);
67 		ret = PTR_ERR(inode);
68 		goto out;
69 	}
70 
71 	gossip_debug(GOSSIP_NAME_DEBUG,
72 		     "%s: Assigned inode :%pU: for file :%pd:\n",
73 		     __func__,
74 		     get_khandle_from_ino(inode),
75 		     dentry);
76 
77 	d_instantiate_new(dentry, inode);
78 	orangefs_set_timeout(dentry);
79 
80 	gossip_debug(GOSSIP_NAME_DEBUG,
81 		     "%s: dentry instantiated for %pd\n",
82 		     __func__,
83 		     dentry);
84 
85 	memset(&iattr, 0, sizeof iattr);
86 	iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
87 	iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
88 	__orangefs_setattr(dir, &iattr);
89 	ret = 0;
90 out:
91 	op_release(new_op);
92 	gossip_debug(GOSSIP_NAME_DEBUG,
93 		     "%s: %pd: returning %d\n",
94 		     __func__,
95 		     dentry,
96 		     ret);
97 	return ret;
98 }
99 
100 /*
101  * Attempt to resolve an object name (dentry->d_name), parent handle, and
102  * fsid into a handle for the object.
103  */
104 static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
105 				   unsigned int flags)
106 {
107 	struct orangefs_inode_s *parent = ORANGEFS_I(dir);
108 	struct orangefs_kernel_op_s *new_op;
109 	struct inode *inode;
110 	int ret = -EINVAL;
111 
112 	/*
113 	 * in theory we could skip a lookup here (if the intent is to
114 	 * create) in order to avoid a potentially failed lookup, but
115 	 * leaving it in can skip a valid lookup and try to create a file
116 	 * that already exists (e.g. the vfs already handles checking for
117 	 * -EEXIST on O_EXCL opens, which is broken if we skip this lookup
118 	 * in the create path)
119 	 */
120 	gossip_debug(GOSSIP_NAME_DEBUG, "%s called on %pd\n",
121 		     __func__, dentry);
122 
123 	if (dentry->d_name.len > (ORANGEFS_NAME_MAX - 1))
124 		return ERR_PTR(-ENAMETOOLONG);
125 
126 	new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
127 	if (!new_op)
128 		return ERR_PTR(-ENOMEM);
129 
130 	new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
131 
132 	gossip_debug(GOSSIP_NAME_DEBUG, "%s:%s:%d using parent %pU\n",
133 		     __FILE__,
134 		     __func__,
135 		     __LINE__,
136 		     &parent->refn.khandle);
137 	new_op->upcall.req.lookup.parent_refn = parent->refn;
138 
139 	strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name,
140 		ORANGEFS_NAME_MAX - 1);
141 
142 	gossip_debug(GOSSIP_NAME_DEBUG,
143 		     "%s: doing lookup on %s under %pU,%d\n",
144 		     __func__,
145 		     new_op->upcall.req.lookup.d_name,
146 		     &new_op->upcall.req.lookup.parent_refn.khandle,
147 		     new_op->upcall.req.lookup.parent_refn.fs_id);
148 
149 	ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
150 
151 	gossip_debug(GOSSIP_NAME_DEBUG,
152 		     "Lookup Got %pU, fsid %d (ret=%d)\n",
153 		     &new_op->downcall.resp.lookup.refn.khandle,
154 		     new_op->downcall.resp.lookup.refn.fs_id,
155 		     ret);
156 
157 	if (ret == 0) {
158 		orangefs_set_timeout(dentry);
159 		inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn);
160 	} else if (ret == -ENOENT) {
161 		inode = NULL;
162 	} else {
163 		/* must be a non-recoverable error */
164 		inode = ERR_PTR(ret);
165 	}
166 
167 	op_release(new_op);
168 	return d_splice_alias(inode, dentry);
169 }
170 
171 /* return 0 on success; non-zero otherwise */
172 static int orangefs_unlink(struct inode *dir, struct dentry *dentry)
173 {
174 	struct inode *inode = dentry->d_inode;
175 	struct orangefs_inode_s *parent = ORANGEFS_I(dir);
176 	struct orangefs_kernel_op_s *new_op;
177 	struct iattr iattr;
178 	int ret;
179 
180 	gossip_debug(GOSSIP_NAME_DEBUG,
181 		     "%s: called on %pd\n"
182 		     "  (inode %pU): Parent is %pU | fs_id %d\n",
183 		     __func__,
184 		     dentry,
185 		     get_khandle_from_ino(inode),
186 		     &parent->refn.khandle,
187 		     parent->refn.fs_id);
188 
189 	new_op = op_alloc(ORANGEFS_VFS_OP_REMOVE);
190 	if (!new_op)
191 		return -ENOMEM;
192 
193 	new_op->upcall.req.remove.parent_refn = parent->refn;
194 	strncpy(new_op->upcall.req.remove.d_name, dentry->d_name.name,
195 		ORANGEFS_NAME_MAX - 1);
196 
197 	ret = service_operation(new_op, "orangefs_unlink",
198 				get_interruptible_flag(inode));
199 
200 	gossip_debug(GOSSIP_NAME_DEBUG,
201 		     "%s: service_operation returned:%d:\n",
202 		     __func__,
203 		     ret);
204 
205 	op_release(new_op);
206 
207 	if (!ret) {
208 		drop_nlink(inode);
209 
210 		memset(&iattr, 0, sizeof iattr);
211 		iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
212 		iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
213 		__orangefs_setattr(dir, &iattr);
214 	}
215 	return ret;
216 }
217 
218 static int orangefs_symlink(struct inode *dir,
219 			 struct dentry *dentry,
220 			 const char *symname)
221 {
222 	struct orangefs_inode_s *parent = ORANGEFS_I(dir);
223 	struct orangefs_kernel_op_s *new_op;
224 	struct orangefs_object_kref ref;
225 	struct inode *inode;
226 	struct iattr iattr;
227 	int mode = 0755;
228 	int ret;
229 
230 	gossip_debug(GOSSIP_NAME_DEBUG, "%s: called\n", __func__);
231 
232 	if (!symname)
233 		return -EINVAL;
234 
235 	if (strlen(symname)+1 > ORANGEFS_NAME_MAX)
236 		return -ENAMETOOLONG;
237 
238 	new_op = op_alloc(ORANGEFS_VFS_OP_SYMLINK);
239 	if (!new_op)
240 		return -ENOMEM;
241 
242 	new_op->upcall.req.sym.parent_refn = parent->refn;
243 
244 	fill_default_sys_attrs(new_op->upcall.req.sym.attributes,
245 			       ORANGEFS_TYPE_SYMLINK,
246 			       mode);
247 
248 	strncpy(new_op->upcall.req.sym.entry_name,
249 		dentry->d_name.name,
250 		ORANGEFS_NAME_MAX - 1);
251 	strncpy(new_op->upcall.req.sym.target, symname, ORANGEFS_NAME_MAX - 1);
252 
253 	ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
254 
255 	gossip_debug(GOSSIP_NAME_DEBUG,
256 		     "Symlink Got ORANGEFS handle %pU on fsid %d (ret=%d)\n",
257 		     &new_op->downcall.resp.sym.refn.khandle,
258 		     new_op->downcall.resp.sym.refn.fs_id, ret);
259 
260 	if (ret < 0) {
261 		gossip_debug(GOSSIP_NAME_DEBUG,
262 			    "%s: failed with error code %d\n",
263 			    __func__, ret);
264 		goto out;
265 	}
266 
267 	ref = new_op->downcall.resp.sym.refn;
268 
269 	inode = orangefs_new_inode(dir->i_sb, dir, S_IFLNK | mode, 0, &ref);
270 	if (IS_ERR(inode)) {
271 		gossip_err
272 		    ("*** Failed to allocate orangefs symlink inode\n");
273 		ret = PTR_ERR(inode);
274 		goto out;
275 	}
276 	/*
277 	 * This is necessary because orangefs_inode_getattr will not
278 	 * re-read symlink size as it is impossible for it to change.
279 	 * Invalidating the cache does not help.  orangefs_new_inode
280 	 * does not set the correct size (it does not know symname).
281 	 */
282 	inode->i_size = strlen(symname);
283 
284 	gossip_debug(GOSSIP_NAME_DEBUG,
285 		     "Assigned symlink inode new number of %pU\n",
286 		     get_khandle_from_ino(inode));
287 
288 	d_instantiate_new(dentry, inode);
289 	orangefs_set_timeout(dentry);
290 
291 	gossip_debug(GOSSIP_NAME_DEBUG,
292 		     "Inode (Symlink) %pU -> %pd\n",
293 		     get_khandle_from_ino(inode),
294 		     dentry);
295 
296 	memset(&iattr, 0, sizeof iattr);
297 	iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
298 	iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
299 	__orangefs_setattr(dir, &iattr);
300 	ret = 0;
301 out:
302 	op_release(new_op);
303 	return ret;
304 }
305 
306 static int orangefs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
307 {
308 	struct orangefs_inode_s *parent = ORANGEFS_I(dir);
309 	struct orangefs_kernel_op_s *new_op;
310 	struct orangefs_object_kref ref;
311 	struct inode *inode;
312 	struct iattr iattr;
313 	int ret;
314 
315 	new_op = op_alloc(ORANGEFS_VFS_OP_MKDIR);
316 	if (!new_op)
317 		return -ENOMEM;
318 
319 	new_op->upcall.req.mkdir.parent_refn = parent->refn;
320 
321 	fill_default_sys_attrs(new_op->upcall.req.mkdir.attributes,
322 			      ORANGEFS_TYPE_DIRECTORY, mode);
323 
324 	strncpy(new_op->upcall.req.mkdir.d_name,
325 		dentry->d_name.name, ORANGEFS_NAME_MAX - 1);
326 
327 	ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
328 
329 	gossip_debug(GOSSIP_NAME_DEBUG,
330 		     "Mkdir Got ORANGEFS handle %pU on fsid %d\n",
331 		     &new_op->downcall.resp.mkdir.refn.khandle,
332 		     new_op->downcall.resp.mkdir.refn.fs_id);
333 
334 	if (ret < 0) {
335 		gossip_debug(GOSSIP_NAME_DEBUG,
336 			     "%s: failed with error code %d\n",
337 			     __func__, ret);
338 		goto out;
339 	}
340 
341 	ref = new_op->downcall.resp.mkdir.refn;
342 
343 	inode = orangefs_new_inode(dir->i_sb, dir, S_IFDIR | mode, 0, &ref);
344 	if (IS_ERR(inode)) {
345 		gossip_err("*** Failed to allocate orangefs dir inode\n");
346 		ret = PTR_ERR(inode);
347 		goto out;
348 	}
349 
350 	gossip_debug(GOSSIP_NAME_DEBUG,
351 		     "Assigned dir inode new number of %pU\n",
352 		     get_khandle_from_ino(inode));
353 
354 	d_instantiate_new(dentry, inode);
355 	orangefs_set_timeout(dentry);
356 
357 	gossip_debug(GOSSIP_NAME_DEBUG,
358 		     "Inode (Directory) %pU -> %pd\n",
359 		     get_khandle_from_ino(inode),
360 		     dentry);
361 
362 	/*
363 	 * NOTE: we have no good way to keep nlink consistent for directories
364 	 * across clients; keep constant at 1.
365 	 */
366 	memset(&iattr, 0, sizeof iattr);
367 	iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
368 	iattr.ia_mtime = iattr.ia_ctime = current_time(dir);
369 	__orangefs_setattr(dir, &iattr);
370 out:
371 	op_release(new_op);
372 	return ret;
373 }
374 
375 static int orangefs_rename(struct inode *old_dir,
376 			struct dentry *old_dentry,
377 			struct inode *new_dir,
378 			struct dentry *new_dentry,
379 			unsigned int flags)
380 {
381 	struct orangefs_kernel_op_s *new_op;
382 	struct iattr iattr;
383 	int ret;
384 
385 	if (flags)
386 		return -EINVAL;
387 
388 	gossip_debug(GOSSIP_NAME_DEBUG,
389 		     "orangefs_rename: called (%pd2 => %pd2) ct=%d\n",
390 		     old_dentry, new_dentry, d_count(new_dentry));
391 
392 	memset(&iattr, 0, sizeof iattr);
393 	iattr.ia_valid |= ATTR_MTIME | ATTR_CTIME;
394 	iattr.ia_mtime = iattr.ia_ctime = current_time(new_dir);
395 	__orangefs_setattr(new_dir, &iattr);
396 
397 	new_op = op_alloc(ORANGEFS_VFS_OP_RENAME);
398 	if (!new_op)
399 		return -EINVAL;
400 
401 	new_op->upcall.req.rename.old_parent_refn = ORANGEFS_I(old_dir)->refn;
402 	new_op->upcall.req.rename.new_parent_refn = ORANGEFS_I(new_dir)->refn;
403 
404 	strncpy(new_op->upcall.req.rename.d_old_name,
405 		old_dentry->d_name.name,
406 		ORANGEFS_NAME_MAX - 1);
407 	strncpy(new_op->upcall.req.rename.d_new_name,
408 		new_dentry->d_name.name,
409 		ORANGEFS_NAME_MAX - 1);
410 
411 	ret = service_operation(new_op,
412 				"orangefs_rename",
413 				get_interruptible_flag(old_dentry->d_inode));
414 
415 	gossip_debug(GOSSIP_NAME_DEBUG,
416 		     "orangefs_rename: got downcall status %d\n",
417 		     ret);
418 
419 	if (new_dentry->d_inode)
420 		new_dentry->d_inode->i_ctime = current_time(new_dentry->d_inode);
421 
422 	op_release(new_op);
423 	return ret;
424 }
425 
426 /* ORANGEFS implementation of VFS inode operations for directories */
427 const struct inode_operations orangefs_dir_inode_operations = {
428 	.lookup = orangefs_lookup,
429 	.get_acl = orangefs_get_acl,
430 	.set_acl = orangefs_set_acl,
431 	.create = orangefs_create,
432 	.unlink = orangefs_unlink,
433 	.symlink = orangefs_symlink,
434 	.mkdir = orangefs_mkdir,
435 	.rmdir = orangefs_unlink,
436 	.rename = orangefs_rename,
437 	.setattr = orangefs_setattr,
438 	.getattr = orangefs_getattr,
439 	.listxattr = orangefs_listxattr,
440 	.permission = orangefs_permission,
441 	.update_time = orangefs_update_time,
442 };
443