1 /*
2  *  linux/fs/9p/vfs_inode_dotl.c
3  *
4  * This file contains vfs inode ops for the 9P2000.L protocol.
5  *
6  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License version 2
11  *  as published by the Free Software Foundation.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to:
20  *  Free Software Foundation
21  *  51 Franklin Street, Fifth Floor
22  *  Boston, MA  02111-1301  USA
23  *
24  */
25 
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/file.h>
30 #include <linux/pagemap.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/namei.h>
35 #include <linux/idr.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/xattr.h>
39 #include <linux/posix_acl.h>
40 #include <net/9p/9p.h>
41 #include <net/9p/client.h>
42 
43 #include "v9fs.h"
44 #include "v9fs_vfs.h"
45 #include "fid.h"
46 #include "cache.h"
47 #include "xattr.h"
48 #include "acl.h"
49 
50 static int
51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
52 		    dev_t rdev);
53 
54 /**
55  * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
56  * new file system object. This checks the S_ISGID to determine the owning
57  * group of the new file system object.
58  */
59 
v9fs_get_fsgid_for_create(struct inode * dir_inode)60 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
61 {
62 	BUG_ON(dir_inode == NULL);
63 
64 	if (dir_inode->i_mode & S_ISGID) {
65 		/* set_gid bit is set.*/
66 		return dir_inode->i_gid;
67 	}
68 	return current_fsgid();
69 }
70 
v9fs_test_inode_dotl(struct inode * inode,void * data)71 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
72 {
73 	struct v9fs_inode *v9inode = V9FS_I(inode);
74 	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
75 
76 	/* don't match inode of different type */
77 	if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
78 		return 0;
79 
80 	if (inode->i_generation != st->st_gen)
81 		return 0;
82 
83 	/* compare qid details */
84 	if (memcmp(&v9inode->qid.version,
85 		   &st->qid.version, sizeof(v9inode->qid.version)))
86 		return 0;
87 
88 	if (v9inode->qid.type != st->qid.type)
89 		return 0;
90 
91 	if (v9inode->qid.path != st->qid.path)
92 		return 0;
93 	return 1;
94 }
95 
96 /* Always get a new inode */
v9fs_test_new_inode_dotl(struct inode * inode,void * data)97 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
98 {
99 	return 0;
100 }
101 
v9fs_set_inode_dotl(struct inode * inode,void * data)102 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
103 {
104 	struct v9fs_inode *v9inode = V9FS_I(inode);
105 	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
106 
107 	memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
108 	inode->i_generation = st->st_gen;
109 	return 0;
110 }
111 
v9fs_qid_iget_dotl(struct super_block * sb,struct p9_qid * qid,struct p9_fid * fid,struct p9_stat_dotl * st,int new)112 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
113 					struct p9_qid *qid,
114 					struct p9_fid *fid,
115 					struct p9_stat_dotl *st,
116 					int new)
117 {
118 	int retval;
119 	unsigned long i_ino;
120 	struct inode *inode;
121 	struct v9fs_session_info *v9ses = sb->s_fs_info;
122 	int (*test)(struct inode *, void *);
123 
124 	if (new)
125 		test = v9fs_test_new_inode_dotl;
126 	else
127 		test = v9fs_test_inode_dotl;
128 
129 	i_ino = v9fs_qid2ino(qid);
130 	inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
131 	if (!inode)
132 		return ERR_PTR(-ENOMEM);
133 	if (!(inode->i_state & I_NEW))
134 		return inode;
135 	/*
136 	 * initialize the inode with the stat info
137 	 * FIXME!! we may need support for stale inodes
138 	 * later.
139 	 */
140 	inode->i_ino = i_ino;
141 	retval = v9fs_init_inode(v9ses, inode,
142 				 st->st_mode, new_decode_dev(st->st_rdev));
143 	if (retval)
144 		goto error;
145 
146 	v9fs_stat2inode_dotl(st, inode, 0);
147 	v9fs_cache_inode_get_cookie(inode);
148 	retval = v9fs_get_acl(inode, fid);
149 	if (retval)
150 		goto error;
151 
152 	unlock_new_inode(inode);
153 	return inode;
154 error:
155 	iget_failed(inode);
156 	return ERR_PTR(retval);
157 
158 }
159 
160 struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info * v9ses,struct p9_fid * fid,struct super_block * sb,int new)161 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
162 			 struct super_block *sb, int new)
163 {
164 	struct p9_stat_dotl *st;
165 	struct inode *inode = NULL;
166 
167 	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
168 	if (IS_ERR(st))
169 		return ERR_CAST(st);
170 
171 	inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
172 	kfree(st);
173 	return inode;
174 }
175 
176 struct dotl_openflag_map {
177 	int open_flag;
178 	int dotl_flag;
179 };
180 
v9fs_mapped_dotl_flags(int flags)181 static int v9fs_mapped_dotl_flags(int flags)
182 {
183 	int i;
184 	int rflags = 0;
185 	struct dotl_openflag_map dotl_oflag_map[] = {
186 		{ O_CREAT,	P9_DOTL_CREATE },
187 		{ O_EXCL,	P9_DOTL_EXCL },
188 		{ O_NOCTTY,	P9_DOTL_NOCTTY },
189 		{ O_APPEND,	P9_DOTL_APPEND },
190 		{ O_NONBLOCK,	P9_DOTL_NONBLOCK },
191 		{ O_DSYNC,	P9_DOTL_DSYNC },
192 		{ FASYNC,	P9_DOTL_FASYNC },
193 		{ O_DIRECT,	P9_DOTL_DIRECT },
194 		{ O_LARGEFILE,	P9_DOTL_LARGEFILE },
195 		{ O_DIRECTORY,	P9_DOTL_DIRECTORY },
196 		{ O_NOFOLLOW,	P9_DOTL_NOFOLLOW },
197 		{ O_NOATIME,	P9_DOTL_NOATIME },
198 		{ O_CLOEXEC,	P9_DOTL_CLOEXEC },
199 		{ O_SYNC,	P9_DOTL_SYNC},
200 	};
201 	for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
202 		if (flags & dotl_oflag_map[i].open_flag)
203 			rflags |= dotl_oflag_map[i].dotl_flag;
204 	}
205 	return rflags;
206 }
207 
208 /**
209  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
210  * plan 9 open flag.
211  * @flags: flags to convert
212  */
v9fs_open_to_dotl_flags(int flags)213 int v9fs_open_to_dotl_flags(int flags)
214 {
215 	int rflags = 0;
216 
217 	/*
218 	 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
219 	 * and P9_DOTL_NOACCESS
220 	 */
221 	rflags |= flags & O_ACCMODE;
222 	rflags |= v9fs_mapped_dotl_flags(flags);
223 
224 	return rflags;
225 }
226 
227 /**
228  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
229  * @dir: directory inode that is being created
230  * @dentry:  dentry that is being deleted
231  * @omode: create permissions
232  *
233  */
234 
235 static int
v9fs_vfs_create_dotl(struct inode * dir,struct dentry * dentry,umode_t omode,bool excl)236 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
237 		bool excl)
238 {
239 	return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
240 }
241 
242 static int
v9fs_vfs_atomic_open_dotl(struct inode * dir,struct dentry * dentry,struct file * file,unsigned flags,umode_t omode)243 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
244 			  struct file *file, unsigned flags, umode_t omode)
245 {
246 	int err = 0;
247 	kgid_t gid;
248 	umode_t mode;
249 	const unsigned char *name = NULL;
250 	struct p9_qid qid;
251 	struct inode *inode;
252 	struct p9_fid *fid = NULL;
253 	struct v9fs_inode *v9inode;
254 	struct p9_fid *dfid, *ofid, *inode_fid;
255 	struct v9fs_session_info *v9ses;
256 	struct posix_acl *pacl = NULL, *dacl = NULL;
257 	struct dentry *res = NULL;
258 
259 	if (d_in_lookup(dentry)) {
260 		res = v9fs_vfs_lookup(dir, dentry, 0);
261 		if (IS_ERR(res))
262 			return PTR_ERR(res);
263 
264 		if (res)
265 			dentry = res;
266 	}
267 
268 	/* Only creates */
269 	if (!(flags & O_CREAT) || d_really_is_positive(dentry))
270 		return	finish_no_open(file, res);
271 
272 	v9ses = v9fs_inode2v9ses(dir);
273 
274 	name = dentry->d_name.name;
275 	p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
276 		 name, flags, omode);
277 
278 	dfid = v9fs_parent_fid(dentry);
279 	if (IS_ERR(dfid)) {
280 		err = PTR_ERR(dfid);
281 		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
282 		goto out;
283 	}
284 
285 	/* clone a fid to use for creation */
286 	ofid = clone_fid(dfid);
287 	if (IS_ERR(ofid)) {
288 		err = PTR_ERR(ofid);
289 		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
290 		goto out;
291 	}
292 
293 	gid = v9fs_get_fsgid_for_create(dir);
294 
295 	mode = omode;
296 	/* Update mode based on ACL value */
297 	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
298 	if (err) {
299 		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
300 			 err);
301 		goto error;
302 	}
303 	err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
304 				    mode, gid, &qid);
305 	if (err < 0) {
306 		p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
307 			 err);
308 		goto error;
309 	}
310 	v9fs_invalidate_inode_attr(dir);
311 
312 	/* instantiate inode and assign the unopened fid to the dentry */
313 	fid = p9_client_walk(dfid, 1, &name, 1);
314 	if (IS_ERR(fid)) {
315 		err = PTR_ERR(fid);
316 		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
317 		fid = NULL;
318 		goto error;
319 	}
320 	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
321 	if (IS_ERR(inode)) {
322 		err = PTR_ERR(inode);
323 		p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
324 		goto error;
325 	}
326 	/* Now set the ACL based on the default value */
327 	v9fs_set_create_acl(inode, fid, dacl, pacl);
328 
329 	v9fs_fid_add(dentry, fid);
330 	d_instantiate(dentry, inode);
331 
332 	v9inode = V9FS_I(inode);
333 	mutex_lock(&v9inode->v_mutex);
334 	if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
335 	    !v9inode->writeback_fid &&
336 	    ((flags & O_ACCMODE) != O_RDONLY)) {
337 		/*
338 		 * clone a fid and add it to writeback_fid
339 		 * we do it during open time instead of
340 		 * page dirty time via write_begin/page_mkwrite
341 		 * because we want write after unlink usecase
342 		 * to work.
343 		 */
344 		inode_fid = v9fs_writeback_fid(dentry);
345 		if (IS_ERR(inode_fid)) {
346 			err = PTR_ERR(inode_fid);
347 			mutex_unlock(&v9inode->v_mutex);
348 			goto err_clunk_old_fid;
349 		}
350 		v9inode->writeback_fid = (void *) inode_fid;
351 	}
352 	mutex_unlock(&v9inode->v_mutex);
353 	/* Since we are opening a file, assign the open fid to the file */
354 	err = finish_open(file, dentry, generic_file_open);
355 	if (err)
356 		goto err_clunk_old_fid;
357 	file->private_data = ofid;
358 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
359 		v9fs_cache_inode_set_cookie(inode, file);
360 	file->f_mode |= FMODE_CREATED;
361 out:
362 	v9fs_put_acl(dacl, pacl);
363 	dput(res);
364 	return err;
365 
366 error:
367 	if (fid)
368 		p9_client_clunk(fid);
369 err_clunk_old_fid:
370 	if (ofid)
371 		p9_client_clunk(ofid);
372 	goto out;
373 }
374 
375 /**
376  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
377  * @dir:  inode that is being unlinked
378  * @dentry: dentry that is being unlinked
379  * @omode: mode for new directory
380  *
381  */
382 
v9fs_vfs_mkdir_dotl(struct inode * dir,struct dentry * dentry,umode_t omode)383 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
384 			       struct dentry *dentry, umode_t omode)
385 {
386 	int err;
387 	struct v9fs_session_info *v9ses;
388 	struct p9_fid *fid = NULL, *dfid = NULL;
389 	kgid_t gid;
390 	const unsigned char *name;
391 	umode_t mode;
392 	struct inode *inode;
393 	struct p9_qid qid;
394 	struct posix_acl *dacl = NULL, *pacl = NULL;
395 
396 	p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
397 	err = 0;
398 	v9ses = v9fs_inode2v9ses(dir);
399 
400 	omode |= S_IFDIR;
401 	if (dir->i_mode & S_ISGID)
402 		omode |= S_ISGID;
403 
404 	dfid = v9fs_parent_fid(dentry);
405 	if (IS_ERR(dfid)) {
406 		err = PTR_ERR(dfid);
407 		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
408 		dfid = NULL;
409 		goto error;
410 	}
411 
412 	gid = v9fs_get_fsgid_for_create(dir);
413 	mode = omode;
414 	/* Update mode based on ACL value */
415 	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
416 	if (err) {
417 		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
418 			 err);
419 		goto error;
420 	}
421 	name = dentry->d_name.name;
422 	err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
423 	if (err < 0)
424 		goto error;
425 
426 	fid = p9_client_walk(dfid, 1, &name, 1);
427 	if (IS_ERR(fid)) {
428 		err = PTR_ERR(fid);
429 		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
430 			 err);
431 		fid = NULL;
432 		goto error;
433 	}
434 
435 	/* instantiate inode and assign the unopened fid to the dentry */
436 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
437 		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
438 		if (IS_ERR(inode)) {
439 			err = PTR_ERR(inode);
440 			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
441 				 err);
442 			goto error;
443 		}
444 		v9fs_fid_add(dentry, fid);
445 		v9fs_set_create_acl(inode, fid, dacl, pacl);
446 		d_instantiate(dentry, inode);
447 		fid = NULL;
448 		err = 0;
449 	} else {
450 		/*
451 		 * Not in cached mode. No need to populate
452 		 * inode with stat. We need to get an inode
453 		 * so that we can set the acl with dentry
454 		 */
455 		inode = v9fs_get_inode(dir->i_sb, mode, 0);
456 		if (IS_ERR(inode)) {
457 			err = PTR_ERR(inode);
458 			goto error;
459 		}
460 		v9fs_set_create_acl(inode, fid, dacl, pacl);
461 		d_instantiate(dentry, inode);
462 	}
463 	inc_nlink(dir);
464 	v9fs_invalidate_inode_attr(dir);
465 error:
466 	if (fid)
467 		p9_client_clunk(fid);
468 	v9fs_put_acl(dacl, pacl);
469 	return err;
470 }
471 
472 static int
v9fs_vfs_getattr_dotl(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)473 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
474 		 u32 request_mask, unsigned int flags)
475 {
476 	struct dentry *dentry = path->dentry;
477 	struct v9fs_session_info *v9ses;
478 	struct p9_fid *fid;
479 	struct p9_stat_dotl *st;
480 
481 	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
482 	v9ses = v9fs_dentry2v9ses(dentry);
483 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
484 		generic_fillattr(d_inode(dentry), stat);
485 		return 0;
486 	}
487 	fid = v9fs_fid_lookup(dentry);
488 	if (IS_ERR(fid))
489 		return PTR_ERR(fid);
490 
491 	/* Ask for all the fields in stat structure. Server will return
492 	 * whatever it supports
493 	 */
494 
495 	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
496 	if (IS_ERR(st))
497 		return PTR_ERR(st);
498 
499 	v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
500 	generic_fillattr(d_inode(dentry), stat);
501 	/* Change block size to what the server returned */
502 	stat->blksize = st->st_blksize;
503 
504 	kfree(st);
505 	return 0;
506 }
507 
508 /*
509  * Attribute flags.
510  */
511 #define P9_ATTR_MODE		(1 << 0)
512 #define P9_ATTR_UID		(1 << 1)
513 #define P9_ATTR_GID		(1 << 2)
514 #define P9_ATTR_SIZE		(1 << 3)
515 #define P9_ATTR_ATIME		(1 << 4)
516 #define P9_ATTR_MTIME		(1 << 5)
517 #define P9_ATTR_CTIME		(1 << 6)
518 #define P9_ATTR_ATIME_SET	(1 << 7)
519 #define P9_ATTR_MTIME_SET	(1 << 8)
520 
521 struct dotl_iattr_map {
522 	int iattr_valid;
523 	int p9_iattr_valid;
524 };
525 
v9fs_mapped_iattr_valid(int iattr_valid)526 static int v9fs_mapped_iattr_valid(int iattr_valid)
527 {
528 	int i;
529 	int p9_iattr_valid = 0;
530 	struct dotl_iattr_map dotl_iattr_map[] = {
531 		{ ATTR_MODE,		P9_ATTR_MODE },
532 		{ ATTR_UID,		P9_ATTR_UID },
533 		{ ATTR_GID,		P9_ATTR_GID },
534 		{ ATTR_SIZE,		P9_ATTR_SIZE },
535 		{ ATTR_ATIME,		P9_ATTR_ATIME },
536 		{ ATTR_MTIME,		P9_ATTR_MTIME },
537 		{ ATTR_CTIME,		P9_ATTR_CTIME },
538 		{ ATTR_ATIME_SET,	P9_ATTR_ATIME_SET },
539 		{ ATTR_MTIME_SET,	P9_ATTR_MTIME_SET },
540 	};
541 	for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
542 		if (iattr_valid & dotl_iattr_map[i].iattr_valid)
543 			p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
544 	}
545 	return p9_iattr_valid;
546 }
547 
548 /**
549  * v9fs_vfs_setattr_dotl - set file metadata
550  * @dentry: file whose metadata to set
551  * @iattr: metadata assignment structure
552  *
553  */
554 
v9fs_vfs_setattr_dotl(struct dentry * dentry,struct iattr * iattr)555 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
556 {
557 	int retval;
558 	struct p9_fid *fid;
559 	struct p9_iattr_dotl p9attr;
560 	struct inode *inode = d_inode(dentry);
561 
562 	p9_debug(P9_DEBUG_VFS, "\n");
563 
564 	retval = setattr_prepare(dentry, iattr);
565 	if (retval)
566 		return retval;
567 
568 	p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
569 	p9attr.mode = iattr->ia_mode;
570 	p9attr.uid = iattr->ia_uid;
571 	p9attr.gid = iattr->ia_gid;
572 	p9attr.size = iattr->ia_size;
573 	p9attr.atime_sec = iattr->ia_atime.tv_sec;
574 	p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
575 	p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
576 	p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
577 
578 	fid = v9fs_fid_lookup(dentry);
579 	if (IS_ERR(fid))
580 		return PTR_ERR(fid);
581 
582 	/* Write all dirty data */
583 	if (S_ISREG(inode->i_mode))
584 		filemap_write_and_wait(inode->i_mapping);
585 
586 	retval = p9_client_setattr(fid, &p9attr);
587 	if (retval < 0)
588 		return retval;
589 
590 	if ((iattr->ia_valid & ATTR_SIZE) &&
591 	    iattr->ia_size != i_size_read(inode))
592 		truncate_setsize(inode, iattr->ia_size);
593 
594 	v9fs_invalidate_inode_attr(inode);
595 	setattr_copy(inode, iattr);
596 	mark_inode_dirty(inode);
597 	if (iattr->ia_valid & ATTR_MODE) {
598 		/* We also want to update ACL when we update mode bits */
599 		retval = v9fs_acl_chmod(inode, fid);
600 		if (retval < 0)
601 			return retval;
602 	}
603 	return 0;
604 }
605 
606 /**
607  * v9fs_stat2inode_dotl - populate an inode structure with stat info
608  * @stat: stat structure
609  * @inode: inode to populate
610  * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
611  *
612  */
613 
614 void
v9fs_stat2inode_dotl(struct p9_stat_dotl * stat,struct inode * inode,unsigned int flags)615 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
616 		      unsigned int flags)
617 {
618 	umode_t mode;
619 	struct v9fs_inode *v9inode = V9FS_I(inode);
620 
621 	if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
622 		inode->i_atime.tv_sec = stat->st_atime_sec;
623 		inode->i_atime.tv_nsec = stat->st_atime_nsec;
624 		inode->i_mtime.tv_sec = stat->st_mtime_sec;
625 		inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
626 		inode->i_ctime.tv_sec = stat->st_ctime_sec;
627 		inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
628 		inode->i_uid = stat->st_uid;
629 		inode->i_gid = stat->st_gid;
630 		set_nlink(inode, stat->st_nlink);
631 
632 		mode = stat->st_mode & S_IALLUGO;
633 		mode |= inode->i_mode & ~S_IALLUGO;
634 		inode->i_mode = mode;
635 
636 		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
637 			v9fs_i_size_write(inode, stat->st_size);
638 		inode->i_blocks = stat->st_blocks;
639 	} else {
640 		if (stat->st_result_mask & P9_STATS_ATIME) {
641 			inode->i_atime.tv_sec = stat->st_atime_sec;
642 			inode->i_atime.tv_nsec = stat->st_atime_nsec;
643 		}
644 		if (stat->st_result_mask & P9_STATS_MTIME) {
645 			inode->i_mtime.tv_sec = stat->st_mtime_sec;
646 			inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
647 		}
648 		if (stat->st_result_mask & P9_STATS_CTIME) {
649 			inode->i_ctime.tv_sec = stat->st_ctime_sec;
650 			inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
651 		}
652 		if (stat->st_result_mask & P9_STATS_UID)
653 			inode->i_uid = stat->st_uid;
654 		if (stat->st_result_mask & P9_STATS_GID)
655 			inode->i_gid = stat->st_gid;
656 		if (stat->st_result_mask & P9_STATS_NLINK)
657 			set_nlink(inode, stat->st_nlink);
658 		if (stat->st_result_mask & P9_STATS_MODE) {
659 			mode = stat->st_mode & S_IALLUGO;
660 			mode |= inode->i_mode & ~S_IALLUGO;
661 			inode->i_mode = mode;
662 		}
663 		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
664 		    stat->st_result_mask & P9_STATS_SIZE)
665 			v9fs_i_size_write(inode, stat->st_size);
666 		if (stat->st_result_mask & P9_STATS_BLOCKS)
667 			inode->i_blocks = stat->st_blocks;
668 	}
669 	if (stat->st_result_mask & P9_STATS_GEN)
670 		inode->i_generation = stat->st_gen;
671 
672 	/* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
673 	 * because the inode structure does not have fields for them.
674 	 */
675 	v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
676 }
677 
678 static int
v9fs_vfs_symlink_dotl(struct inode * dir,struct dentry * dentry,const char * symname)679 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
680 		const char *symname)
681 {
682 	int err;
683 	kgid_t gid;
684 	const unsigned char *name;
685 	struct p9_qid qid;
686 	struct inode *inode;
687 	struct p9_fid *dfid;
688 	struct p9_fid *fid = NULL;
689 	struct v9fs_session_info *v9ses;
690 
691 	name = dentry->d_name.name;
692 	p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
693 	v9ses = v9fs_inode2v9ses(dir);
694 
695 	dfid = v9fs_parent_fid(dentry);
696 	if (IS_ERR(dfid)) {
697 		err = PTR_ERR(dfid);
698 		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
699 		return err;
700 	}
701 
702 	gid = v9fs_get_fsgid_for_create(dir);
703 
704 	/* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
705 	err = p9_client_symlink(dfid, name, symname, gid, &qid);
706 
707 	if (err < 0) {
708 		p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
709 		goto error;
710 	}
711 
712 	v9fs_invalidate_inode_attr(dir);
713 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
714 		/* Now walk from the parent so we can get an unopened fid. */
715 		fid = p9_client_walk(dfid, 1, &name, 1);
716 		if (IS_ERR(fid)) {
717 			err = PTR_ERR(fid);
718 			p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
719 				 err);
720 			fid = NULL;
721 			goto error;
722 		}
723 
724 		/* instantiate inode and assign the unopened fid to dentry */
725 		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
726 		if (IS_ERR(inode)) {
727 			err = PTR_ERR(inode);
728 			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
729 				 err);
730 			goto error;
731 		}
732 		v9fs_fid_add(dentry, fid);
733 		d_instantiate(dentry, inode);
734 		fid = NULL;
735 		err = 0;
736 	} else {
737 		/* Not in cached mode. No need to populate inode with stat */
738 		inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
739 		if (IS_ERR(inode)) {
740 			err = PTR_ERR(inode);
741 			goto error;
742 		}
743 		d_instantiate(dentry, inode);
744 	}
745 
746 error:
747 	if (fid)
748 		p9_client_clunk(fid);
749 
750 	return err;
751 }
752 
753 /**
754  * v9fs_vfs_link_dotl - create a hardlink for dotl
755  * @old_dentry: dentry for file to link to
756  * @dir: inode destination for new link
757  * @dentry: dentry for link
758  *
759  */
760 
761 static int
v9fs_vfs_link_dotl(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)762 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
763 		struct dentry *dentry)
764 {
765 	int err;
766 	struct p9_fid *dfid, *oldfid;
767 	struct v9fs_session_info *v9ses;
768 
769 	p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
770 		 dir->i_ino, old_dentry, dentry);
771 
772 	v9ses = v9fs_inode2v9ses(dir);
773 	dfid = v9fs_parent_fid(dentry);
774 	if (IS_ERR(dfid))
775 		return PTR_ERR(dfid);
776 
777 	oldfid = v9fs_fid_lookup(old_dentry);
778 	if (IS_ERR(oldfid))
779 		return PTR_ERR(oldfid);
780 
781 	err = p9_client_link(dfid, oldfid, dentry->d_name.name);
782 
783 	if (err < 0) {
784 		p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
785 		return err;
786 	}
787 
788 	v9fs_invalidate_inode_attr(dir);
789 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
790 		/* Get the latest stat info from server. */
791 		struct p9_fid *fid;
792 		fid = v9fs_fid_lookup(old_dentry);
793 		if (IS_ERR(fid))
794 			return PTR_ERR(fid);
795 
796 		v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
797 	}
798 	ihold(d_inode(old_dentry));
799 	d_instantiate(dentry, d_inode(old_dentry));
800 
801 	return err;
802 }
803 
804 /**
805  * v9fs_vfs_mknod_dotl - create a special file
806  * @dir: inode destination for new link
807  * @dentry: dentry for file
808  * @omode: mode for creation
809  * @rdev: device associated with special file
810  *
811  */
812 static int
v9fs_vfs_mknod_dotl(struct inode * dir,struct dentry * dentry,umode_t omode,dev_t rdev)813 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
814 		dev_t rdev)
815 {
816 	int err;
817 	kgid_t gid;
818 	const unsigned char *name;
819 	umode_t mode;
820 	struct v9fs_session_info *v9ses;
821 	struct p9_fid *fid = NULL, *dfid = NULL;
822 	struct inode *inode;
823 	struct p9_qid qid;
824 	struct posix_acl *dacl = NULL, *pacl = NULL;
825 
826 	p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
827 		 dir->i_ino, dentry, omode,
828 		 MAJOR(rdev), MINOR(rdev));
829 
830 	v9ses = v9fs_inode2v9ses(dir);
831 	dfid = v9fs_parent_fid(dentry);
832 	if (IS_ERR(dfid)) {
833 		err = PTR_ERR(dfid);
834 		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
835 		dfid = NULL;
836 		goto error;
837 	}
838 
839 	gid = v9fs_get_fsgid_for_create(dir);
840 	mode = omode;
841 	/* Update mode based on ACL value */
842 	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
843 	if (err) {
844 		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
845 			 err);
846 		goto error;
847 	}
848 	name = dentry->d_name.name;
849 
850 	err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
851 	if (err < 0)
852 		goto error;
853 
854 	v9fs_invalidate_inode_attr(dir);
855 	fid = p9_client_walk(dfid, 1, &name, 1);
856 	if (IS_ERR(fid)) {
857 		err = PTR_ERR(fid);
858 		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
859 			 err);
860 		fid = NULL;
861 		goto error;
862 	}
863 
864 	/* instantiate inode and assign the unopened fid to the dentry */
865 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
866 		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
867 		if (IS_ERR(inode)) {
868 			err = PTR_ERR(inode);
869 			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
870 				 err);
871 			goto error;
872 		}
873 		v9fs_set_create_acl(inode, fid, dacl, pacl);
874 		v9fs_fid_add(dentry, fid);
875 		d_instantiate(dentry, inode);
876 		fid = NULL;
877 		err = 0;
878 	} else {
879 		/*
880 		 * Not in cached mode. No need to populate inode with stat.
881 		 * socket syscall returns a fd, so we need instantiate
882 		 */
883 		inode = v9fs_get_inode(dir->i_sb, mode, rdev);
884 		if (IS_ERR(inode)) {
885 			err = PTR_ERR(inode);
886 			goto error;
887 		}
888 		v9fs_set_create_acl(inode, fid, dacl, pacl);
889 		d_instantiate(dentry, inode);
890 	}
891 error:
892 	if (fid)
893 		p9_client_clunk(fid);
894 	v9fs_put_acl(dacl, pacl);
895 	return err;
896 }
897 
898 /**
899  * v9fs_vfs_get_link_dotl - follow a symlink path
900  * @dentry: dentry for symlink
901  * @inode: inode for symlink
902  * @done: destructor for return value
903  */
904 
905 static const char *
v9fs_vfs_get_link_dotl(struct dentry * dentry,struct inode * inode,struct delayed_call * done)906 v9fs_vfs_get_link_dotl(struct dentry *dentry,
907 		       struct inode *inode,
908 		       struct delayed_call *done)
909 {
910 	struct p9_fid *fid;
911 	char *target;
912 	int retval;
913 
914 	if (!dentry)
915 		return ERR_PTR(-ECHILD);
916 
917 	p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
918 
919 	fid = v9fs_fid_lookup(dentry);
920 	if (IS_ERR(fid))
921 		return ERR_CAST(fid);
922 	retval = p9_client_readlink(fid, &target);
923 	if (retval)
924 		return ERR_PTR(retval);
925 	set_delayed_call(done, kfree_link, target);
926 	return target;
927 }
928 
v9fs_refresh_inode_dotl(struct p9_fid * fid,struct inode * inode)929 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
930 {
931 	struct p9_stat_dotl *st;
932 	struct v9fs_session_info *v9ses;
933 	unsigned int flags;
934 
935 	v9ses = v9fs_inode2v9ses(inode);
936 	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
937 	if (IS_ERR(st))
938 		return PTR_ERR(st);
939 	/*
940 	 * Don't update inode if the file type is different
941 	 */
942 	if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
943 		goto out;
944 
945 	/*
946 	 * We don't want to refresh inode->i_size,
947 	 * because we may have cached data
948 	 */
949 	flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
950 		V9FS_STAT2INODE_KEEP_ISIZE : 0;
951 	v9fs_stat2inode_dotl(st, inode, flags);
952 out:
953 	kfree(st);
954 	return 0;
955 }
956 
957 const struct inode_operations v9fs_dir_inode_operations_dotl = {
958 	.create = v9fs_vfs_create_dotl,
959 	.atomic_open = v9fs_vfs_atomic_open_dotl,
960 	.lookup = v9fs_vfs_lookup,
961 	.link = v9fs_vfs_link_dotl,
962 	.symlink = v9fs_vfs_symlink_dotl,
963 	.unlink = v9fs_vfs_unlink,
964 	.mkdir = v9fs_vfs_mkdir_dotl,
965 	.rmdir = v9fs_vfs_rmdir,
966 	.mknod = v9fs_vfs_mknod_dotl,
967 	.rename = v9fs_vfs_rename,
968 	.getattr = v9fs_vfs_getattr_dotl,
969 	.setattr = v9fs_vfs_setattr_dotl,
970 	.listxattr = v9fs_listxattr,
971 	.get_acl = v9fs_iop_get_acl,
972 };
973 
974 const struct inode_operations v9fs_file_inode_operations_dotl = {
975 	.getattr = v9fs_vfs_getattr_dotl,
976 	.setattr = v9fs_vfs_setattr_dotl,
977 	.listxattr = v9fs_listxattr,
978 	.get_acl = v9fs_iop_get_acl,
979 };
980 
981 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
982 	.get_link = v9fs_vfs_get_link_dotl,
983 	.getattr = v9fs_vfs_getattr_dotl,
984 	.setattr = v9fs_vfs_setattr_dotl,
985 	.listxattr = v9fs_listxattr,
986 };
987