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 */
18static int orangefs_create(struct mnt_idmap *idmap,
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;
91out:
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 */
105static 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 */
173static 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
219static int orangefs_symlink(struct mnt_idmap *idmap,
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;
303out:
304	op_release(new_op);
305	return ret;
306}
307
308static int orangefs_mkdir(struct mnt_idmap *idmap, 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);
373out:
374	op_release(new_op);
375	return ret;
376}
377
378static int orangefs_rename(struct mnt_idmap *idmap,
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		inode_set_ctime_current(d_inode(new_dentry));
425
426	op_release(new_op);
427	return ret;
428}
429
430/* ORANGEFS implementation of VFS inode operations for directories */
431const struct inode_operations orangefs_dir_inode_operations = {
432	.lookup = orangefs_lookup,
433	.get_inode_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