xref: /openbmc/linux/fs/9p/vfs_inode_dotl.c (revision 565d76cb)
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, int 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 
60 static gid_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 
71 /**
72  * v9fs_dentry_from_dir_inode - helper function to get the dentry from
73  * dir inode.
74  *
75  */
76 
77 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
78 {
79 	struct dentry *dentry;
80 
81 	spin_lock(&inode->i_lock);
82 	/* Directory should have only one entry. */
83 	BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
84 	dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
85 	spin_unlock(&inode->i_lock);
86 	return dentry;
87 }
88 
89 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
90 					struct p9_qid *qid,
91 					struct p9_fid *fid,
92 					struct p9_stat_dotl *st)
93 {
94 	int retval;
95 	unsigned long i_ino;
96 	struct inode *inode;
97 	struct v9fs_session_info *v9ses = sb->s_fs_info;
98 
99 	i_ino = v9fs_qid2ino(qid);
100 	inode = iget_locked(sb, i_ino);
101 	if (!inode)
102 		return ERR_PTR(-ENOMEM);
103 	if (!(inode->i_state & I_NEW))
104 		return inode;
105 	/*
106 	 * initialize the inode with the stat info
107 	 * FIXME!! we may need support for stale inodes
108 	 * later.
109 	 */
110 	retval = v9fs_init_inode(v9ses, inode, st->st_mode);
111 	if (retval)
112 		goto error;
113 
114 	v9fs_stat2inode_dotl(st, inode);
115 #ifdef CONFIG_9P_FSCACHE
116 	v9fs_fscache_set_key(inode, &st->qid);
117 	v9fs_cache_inode_get_cookie(inode);
118 #endif
119 	retval = v9fs_get_acl(inode, fid);
120 	if (retval)
121 		goto error;
122 
123 	unlock_new_inode(inode);
124 	return inode;
125 error:
126 	unlock_new_inode(inode);
127 	iput(inode);
128 	return ERR_PTR(retval);
129 
130 }
131 
132 struct inode *
133 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
134 			 struct super_block *sb)
135 {
136 	struct p9_stat_dotl *st;
137 	struct inode *inode = NULL;
138 
139 	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
140 	if (IS_ERR(st))
141 		return ERR_CAST(st);
142 
143 	inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st);
144 	kfree(st);
145 	return inode;
146 }
147 
148 /**
149  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
150  * @dir: directory inode that is being created
151  * @dentry:  dentry that is being deleted
152  * @mode: create permissions
153  * @nd: path information
154  *
155  */
156 
157 static int
158 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
159 		struct nameidata *nd)
160 {
161 	int err = 0;
162 	gid_t gid;
163 	int flags;
164 	mode_t mode;
165 	char *name = NULL;
166 	struct file *filp;
167 	struct p9_qid qid;
168 	struct inode *inode;
169 	struct p9_fid *fid = NULL;
170 	struct v9fs_inode *v9inode;
171 	struct p9_fid *dfid, *ofid, *inode_fid;
172 	struct v9fs_session_info *v9ses;
173 	struct posix_acl *pacl = NULL, *dacl = NULL;
174 
175 	v9ses = v9fs_inode2v9ses(dir);
176 	if (nd && nd->flags & LOOKUP_OPEN)
177 		flags = nd->intent.open.flags - 1;
178 	else {
179 		/*
180 		 * create call without LOOKUP_OPEN is due
181 		 * to mknod of regular files. So use mknod
182 		 * operation.
183 		 */
184 		return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
185 	}
186 
187 	name = (char *) dentry->d_name.name;
188 	P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
189 			"mode:0x%x\n", name, flags, omode);
190 
191 	dfid = v9fs_fid_lookup(dentry->d_parent);
192 	if (IS_ERR(dfid)) {
193 		err = PTR_ERR(dfid);
194 		P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
195 		return err;
196 	}
197 
198 	/* clone a fid to use for creation */
199 	ofid = p9_client_walk(dfid, 0, NULL, 1);
200 	if (IS_ERR(ofid)) {
201 		err = PTR_ERR(ofid);
202 		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
203 		return err;
204 	}
205 
206 	gid = v9fs_get_fsgid_for_create(dir);
207 
208 	mode = omode;
209 	/* Update mode based on ACL value */
210 	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
211 	if (err) {
212 		P9_DPRINTK(P9_DEBUG_VFS,
213 			   "Failed to get acl values in creat %d\n", err);
214 		goto error;
215 	}
216 	err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
217 	if (err < 0) {
218 		P9_DPRINTK(P9_DEBUG_VFS,
219 				"p9_client_open_dotl failed in creat %d\n",
220 				err);
221 		goto error;
222 	}
223 	v9fs_invalidate_inode_attr(dir);
224 
225 	/* instantiate inode and assign the unopened fid to the dentry */
226 	fid = p9_client_walk(dfid, 1, &name, 1);
227 	if (IS_ERR(fid)) {
228 		err = PTR_ERR(fid);
229 		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
230 		fid = NULL;
231 		goto error;
232 	}
233 	inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
234 	if (IS_ERR(inode)) {
235 		err = PTR_ERR(inode);
236 		P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
237 		goto error;
238 	}
239 	d_instantiate(dentry, inode);
240 	err = v9fs_fid_add(dentry, fid);
241 	if (err < 0)
242 		goto error;
243 
244 	/* Now set the ACL based on the default value */
245 	v9fs_set_create_acl(dentry, dacl, pacl);
246 
247 	v9inode = V9FS_I(inode);
248 	mutex_lock(&v9inode->v_mutex);
249 	if (v9ses->cache && !v9inode->writeback_fid &&
250 	    ((flags & O_ACCMODE) != O_RDONLY)) {
251 		/*
252 		 * clone a fid and add it to writeback_fid
253 		 * we do it during open time instead of
254 		 * page dirty time via write_begin/page_mkwrite
255 		 * because we want write after unlink usecase
256 		 * to work.
257 		 */
258 		inode_fid = v9fs_writeback_fid(dentry);
259 		if (IS_ERR(inode_fid)) {
260 			err = PTR_ERR(inode_fid);
261 			mutex_unlock(&v9inode->v_mutex);
262 			goto error;
263 		}
264 		v9inode->writeback_fid = (void *) inode_fid;
265 	}
266 	mutex_unlock(&v9inode->v_mutex);
267 	/* Since we are opening a file, assign the open fid to the file */
268 	filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
269 	if (IS_ERR(filp)) {
270 		p9_client_clunk(ofid);
271 		return PTR_ERR(filp);
272 	}
273 	filp->private_data = ofid;
274 #ifdef CONFIG_9P_FSCACHE
275 	if (v9ses->cache)
276 		v9fs_cache_inode_set_cookie(inode, filp);
277 #endif
278 	return 0;
279 
280 error:
281 	if (ofid)
282 		p9_client_clunk(ofid);
283 	if (fid)
284 		p9_client_clunk(fid);
285 	return err;
286 }
287 
288 /**
289  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
290  * @dir:  inode that is being unlinked
291  * @dentry: dentry that is being unlinked
292  * @mode: mode for new directory
293  *
294  */
295 
296 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
297 			       struct dentry *dentry, int omode)
298 {
299 	int err;
300 	struct v9fs_session_info *v9ses;
301 	struct p9_fid *fid = NULL, *dfid = NULL;
302 	gid_t gid;
303 	char *name;
304 	mode_t mode;
305 	struct inode *inode;
306 	struct p9_qid qid;
307 	struct dentry *dir_dentry;
308 	struct posix_acl *dacl = NULL, *pacl = NULL;
309 
310 	P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
311 	err = 0;
312 	v9ses = v9fs_inode2v9ses(dir);
313 
314 	omode |= S_IFDIR;
315 	if (dir->i_mode & S_ISGID)
316 		omode |= S_ISGID;
317 
318 	dir_dentry = v9fs_dentry_from_dir_inode(dir);
319 	dfid = v9fs_fid_lookup(dir_dentry);
320 	if (IS_ERR(dfid)) {
321 		err = PTR_ERR(dfid);
322 		P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
323 		dfid = NULL;
324 		goto error;
325 	}
326 
327 	gid = v9fs_get_fsgid_for_create(dir);
328 	mode = omode;
329 	/* Update mode based on ACL value */
330 	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
331 	if (err) {
332 		P9_DPRINTK(P9_DEBUG_VFS,
333 			   "Failed to get acl values in mkdir %d\n", err);
334 		goto error;
335 	}
336 	name = (char *) dentry->d_name.name;
337 	err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
338 	if (err < 0)
339 		goto error;
340 
341 	/* instantiate inode and assign the unopened fid to the dentry */
342 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
343 		fid = p9_client_walk(dfid, 1, &name, 1);
344 		if (IS_ERR(fid)) {
345 			err = PTR_ERR(fid);
346 			P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
347 				err);
348 			fid = NULL;
349 			goto error;
350 		}
351 
352 		inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
353 		if (IS_ERR(inode)) {
354 			err = PTR_ERR(inode);
355 			P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
356 				err);
357 			goto error;
358 		}
359 		d_instantiate(dentry, inode);
360 		err = v9fs_fid_add(dentry, fid);
361 		if (err < 0)
362 			goto error;
363 		fid = NULL;
364 	} else {
365 		/*
366 		 * Not in cached mode. No need to populate
367 		 * inode with stat. We need to get an inode
368 		 * so that we can set the acl with dentry
369 		 */
370 		inode = v9fs_get_inode(dir->i_sb, mode);
371 		if (IS_ERR(inode)) {
372 			err = PTR_ERR(inode);
373 			goto error;
374 		}
375 		d_instantiate(dentry, inode);
376 	}
377 	/* Now set the ACL based on the default value */
378 	v9fs_set_create_acl(dentry, dacl, pacl);
379 	inc_nlink(dir);
380 	v9fs_invalidate_inode_attr(dir);
381 error:
382 	if (fid)
383 		p9_client_clunk(fid);
384 	return err;
385 }
386 
387 static int
388 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
389 		 struct kstat *stat)
390 {
391 	int err;
392 	struct v9fs_session_info *v9ses;
393 	struct p9_fid *fid;
394 	struct p9_stat_dotl *st;
395 
396 	P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
397 	err = -EPERM;
398 	v9ses = v9fs_dentry2v9ses(dentry);
399 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
400 		generic_fillattr(dentry->d_inode, stat);
401 		return 0;
402 	}
403 	fid = v9fs_fid_lookup(dentry);
404 	if (IS_ERR(fid))
405 		return PTR_ERR(fid);
406 
407 	/* Ask for all the fields in stat structure. Server will return
408 	 * whatever it supports
409 	 */
410 
411 	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
412 	if (IS_ERR(st))
413 		return PTR_ERR(st);
414 
415 	v9fs_stat2inode_dotl(st, dentry->d_inode);
416 	generic_fillattr(dentry->d_inode, stat);
417 	/* Change block size to what the server returned */
418 	stat->blksize = st->st_blksize;
419 
420 	kfree(st);
421 	return 0;
422 }
423 
424 /**
425  * v9fs_vfs_setattr_dotl - set file metadata
426  * @dentry: file whose metadata to set
427  * @iattr: metadata assignment structure
428  *
429  */
430 
431 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
432 {
433 	int retval;
434 	struct v9fs_session_info *v9ses;
435 	struct p9_fid *fid;
436 	struct p9_iattr_dotl p9attr;
437 
438 	P9_DPRINTK(P9_DEBUG_VFS, "\n");
439 
440 	retval = inode_change_ok(dentry->d_inode, iattr);
441 	if (retval)
442 		return retval;
443 
444 	p9attr.valid = iattr->ia_valid;
445 	p9attr.mode = iattr->ia_mode;
446 	p9attr.uid = iattr->ia_uid;
447 	p9attr.gid = iattr->ia_gid;
448 	p9attr.size = iattr->ia_size;
449 	p9attr.atime_sec = iattr->ia_atime.tv_sec;
450 	p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
451 	p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
452 	p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
453 
454 	retval = -EPERM;
455 	v9ses = v9fs_dentry2v9ses(dentry);
456 	fid = v9fs_fid_lookup(dentry);
457 	if (IS_ERR(fid))
458 		return PTR_ERR(fid);
459 
460 	/* Write all dirty data */
461 	if (S_ISREG(dentry->d_inode->i_mode))
462 		filemap_write_and_wait(dentry->d_inode->i_mapping);
463 
464 	retval = p9_client_setattr(fid, &p9attr);
465 	if (retval < 0)
466 		return retval;
467 
468 	if ((iattr->ia_valid & ATTR_SIZE) &&
469 	    iattr->ia_size != i_size_read(dentry->d_inode))
470 		truncate_setsize(dentry->d_inode, iattr->ia_size);
471 
472 	v9fs_invalidate_inode_attr(dentry->d_inode);
473 	setattr_copy(dentry->d_inode, iattr);
474 	mark_inode_dirty(dentry->d_inode);
475 	if (iattr->ia_valid & ATTR_MODE) {
476 		/* We also want to update ACL when we update mode bits */
477 		retval = v9fs_acl_chmod(dentry);
478 		if (retval < 0)
479 			return retval;
480 	}
481 	return 0;
482 }
483 
484 /**
485  * v9fs_stat2inode_dotl - populate an inode structure with stat info
486  * @stat: stat structure
487  * @inode: inode to populate
488  * @sb: superblock of filesystem
489  *
490  */
491 
492 void
493 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
494 {
495 	struct v9fs_inode *v9inode = V9FS_I(inode);
496 
497 	if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
498 		inode->i_atime.tv_sec = stat->st_atime_sec;
499 		inode->i_atime.tv_nsec = stat->st_atime_nsec;
500 		inode->i_mtime.tv_sec = stat->st_mtime_sec;
501 		inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
502 		inode->i_ctime.tv_sec = stat->st_ctime_sec;
503 		inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
504 		inode->i_uid = stat->st_uid;
505 		inode->i_gid = stat->st_gid;
506 		inode->i_nlink = stat->st_nlink;
507 		inode->i_mode = stat->st_mode;
508 		inode->i_rdev = new_decode_dev(stat->st_rdev);
509 
510 		if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
511 			init_special_inode(inode, inode->i_mode, inode->i_rdev);
512 
513 		i_size_write(inode, stat->st_size);
514 		inode->i_blocks = stat->st_blocks;
515 	} else {
516 		if (stat->st_result_mask & P9_STATS_ATIME) {
517 			inode->i_atime.tv_sec = stat->st_atime_sec;
518 			inode->i_atime.tv_nsec = stat->st_atime_nsec;
519 		}
520 		if (stat->st_result_mask & P9_STATS_MTIME) {
521 			inode->i_mtime.tv_sec = stat->st_mtime_sec;
522 			inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
523 		}
524 		if (stat->st_result_mask & P9_STATS_CTIME) {
525 			inode->i_ctime.tv_sec = stat->st_ctime_sec;
526 			inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
527 		}
528 		if (stat->st_result_mask & P9_STATS_UID)
529 			inode->i_uid = stat->st_uid;
530 		if (stat->st_result_mask & P9_STATS_GID)
531 			inode->i_gid = stat->st_gid;
532 		if (stat->st_result_mask & P9_STATS_NLINK)
533 			inode->i_nlink = stat->st_nlink;
534 		if (stat->st_result_mask & P9_STATS_MODE) {
535 			inode->i_mode = stat->st_mode;
536 			if ((S_ISBLK(inode->i_mode)) ||
537 						(S_ISCHR(inode->i_mode)))
538 				init_special_inode(inode, inode->i_mode,
539 								inode->i_rdev);
540 		}
541 		if (stat->st_result_mask & P9_STATS_RDEV)
542 			inode->i_rdev = new_decode_dev(stat->st_rdev);
543 		if (stat->st_result_mask & P9_STATS_SIZE)
544 			i_size_write(inode, stat->st_size);
545 		if (stat->st_result_mask & P9_STATS_BLOCKS)
546 			inode->i_blocks = stat->st_blocks;
547 	}
548 	if (stat->st_result_mask & P9_STATS_GEN)
549 			inode->i_generation = stat->st_gen;
550 
551 	/* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
552 	 * because the inode structure does not have fields for them.
553 	 */
554 	v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
555 }
556 
557 static int
558 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
559 		const char *symname)
560 {
561 	int err;
562 	gid_t gid;
563 	char *name;
564 	struct p9_qid qid;
565 	struct inode *inode;
566 	struct p9_fid *dfid;
567 	struct p9_fid *fid = NULL;
568 	struct v9fs_session_info *v9ses;
569 
570 	name = (char *) dentry->d_name.name;
571 	P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
572 			dir->i_ino, name, symname);
573 	v9ses = v9fs_inode2v9ses(dir);
574 
575 	dfid = v9fs_fid_lookup(dentry->d_parent);
576 	if (IS_ERR(dfid)) {
577 		err = PTR_ERR(dfid);
578 		P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
579 		return err;
580 	}
581 
582 	gid = v9fs_get_fsgid_for_create(dir);
583 
584 	/* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
585 	err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
586 
587 	if (err < 0) {
588 		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
589 		goto error;
590 	}
591 
592 	v9fs_invalidate_inode_attr(dir);
593 	if (v9ses->cache) {
594 		/* Now walk from the parent so we can get an unopened fid. */
595 		fid = p9_client_walk(dfid, 1, &name, 1);
596 		if (IS_ERR(fid)) {
597 			err = PTR_ERR(fid);
598 			P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
599 					err);
600 			fid = NULL;
601 			goto error;
602 		}
603 
604 		/* instantiate inode and assign the unopened fid to dentry */
605 		inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
606 		if (IS_ERR(inode)) {
607 			err = PTR_ERR(inode);
608 			P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
609 					err);
610 			goto error;
611 		}
612 		d_instantiate(dentry, inode);
613 		err = v9fs_fid_add(dentry, fid);
614 		if (err < 0)
615 			goto error;
616 		fid = NULL;
617 	} else {
618 		/* Not in cached mode. No need to populate inode with stat */
619 		inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
620 		if (IS_ERR(inode)) {
621 			err = PTR_ERR(inode);
622 			goto error;
623 		}
624 		d_instantiate(dentry, inode);
625 	}
626 
627 error:
628 	if (fid)
629 		p9_client_clunk(fid);
630 
631 	return err;
632 }
633 
634 /**
635  * v9fs_vfs_link_dotl - create a hardlink for dotl
636  * @old_dentry: dentry for file to link to
637  * @dir: inode destination for new link
638  * @dentry: dentry for link
639  *
640  */
641 
642 static int
643 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
644 		struct dentry *dentry)
645 {
646 	int err;
647 	char *name;
648 	struct dentry *dir_dentry;
649 	struct p9_fid *dfid, *oldfid;
650 	struct v9fs_session_info *v9ses;
651 
652 	P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
653 			dir->i_ino, old_dentry->d_name.name,
654 			dentry->d_name.name);
655 
656 	v9ses = v9fs_inode2v9ses(dir);
657 	dir_dentry = v9fs_dentry_from_dir_inode(dir);
658 	dfid = v9fs_fid_lookup(dir_dentry);
659 	if (IS_ERR(dfid))
660 		return PTR_ERR(dfid);
661 
662 	oldfid = v9fs_fid_lookup(old_dentry);
663 	if (IS_ERR(oldfid))
664 		return PTR_ERR(oldfid);
665 
666 	name = (char *) dentry->d_name.name;
667 
668 	err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
669 
670 	if (err < 0) {
671 		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
672 		return err;
673 	}
674 
675 	v9fs_invalidate_inode_attr(dir);
676 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
677 		/* Get the latest stat info from server. */
678 		struct p9_fid *fid;
679 		fid = v9fs_fid_lookup(old_dentry);
680 		if (IS_ERR(fid))
681 			return PTR_ERR(fid);
682 
683 		v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
684 	}
685 	ihold(old_dentry->d_inode);
686 	d_instantiate(dentry, old_dentry->d_inode);
687 
688 	return err;
689 }
690 
691 /**
692  * v9fs_vfs_mknod_dotl - create a special file
693  * @dir: inode destination for new link
694  * @dentry: dentry for file
695  * @mode: mode for creation
696  * @rdev: device associated with special file
697  *
698  */
699 static int
700 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
701 		dev_t rdev)
702 {
703 	int err;
704 	gid_t gid;
705 	char *name;
706 	mode_t mode;
707 	struct v9fs_session_info *v9ses;
708 	struct p9_fid *fid = NULL, *dfid = NULL;
709 	struct inode *inode;
710 	struct p9_qid qid;
711 	struct dentry *dir_dentry;
712 	struct posix_acl *dacl = NULL, *pacl = NULL;
713 
714 	P9_DPRINTK(P9_DEBUG_VFS,
715 		" %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
716 		dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
717 
718 	if (!new_valid_dev(rdev))
719 		return -EINVAL;
720 
721 	v9ses = v9fs_inode2v9ses(dir);
722 	dir_dentry = v9fs_dentry_from_dir_inode(dir);
723 	dfid = v9fs_fid_lookup(dir_dentry);
724 	if (IS_ERR(dfid)) {
725 		err = PTR_ERR(dfid);
726 		P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
727 		dfid = NULL;
728 		goto error;
729 	}
730 
731 	gid = v9fs_get_fsgid_for_create(dir);
732 	mode = omode;
733 	/* Update mode based on ACL value */
734 	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
735 	if (err) {
736 		P9_DPRINTK(P9_DEBUG_VFS,
737 			   "Failed to get acl values in mknod %d\n", err);
738 		goto error;
739 	}
740 	name = (char *) dentry->d_name.name;
741 
742 	err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
743 	if (err < 0)
744 		goto error;
745 
746 	v9fs_invalidate_inode_attr(dir);
747 	/* instantiate inode and assign the unopened fid to the dentry */
748 	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
749 		fid = p9_client_walk(dfid, 1, &name, 1);
750 		if (IS_ERR(fid)) {
751 			err = PTR_ERR(fid);
752 			P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
753 				err);
754 			fid = NULL;
755 			goto error;
756 		}
757 
758 		inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
759 		if (IS_ERR(inode)) {
760 			err = PTR_ERR(inode);
761 			P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
762 				err);
763 			goto error;
764 		}
765 		d_instantiate(dentry, inode);
766 		err = v9fs_fid_add(dentry, fid);
767 		if (err < 0)
768 			goto error;
769 		fid = NULL;
770 	} else {
771 		/*
772 		 * Not in cached mode. No need to populate inode with stat.
773 		 * socket syscall returns a fd, so we need instantiate
774 		 */
775 		inode = v9fs_get_inode(dir->i_sb, mode);
776 		if (IS_ERR(inode)) {
777 			err = PTR_ERR(inode);
778 			goto error;
779 		}
780 		d_instantiate(dentry, inode);
781 	}
782 	/* Now set the ACL based on the default value */
783 	v9fs_set_create_acl(dentry, dacl, pacl);
784 error:
785 	if (fid)
786 		p9_client_clunk(fid);
787 	return err;
788 }
789 
790 /**
791  * v9fs_vfs_follow_link_dotl - follow a symlink path
792  * @dentry: dentry for symlink
793  * @nd: nameidata
794  *
795  */
796 
797 static void *
798 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
799 {
800 	int retval;
801 	struct p9_fid *fid;
802 	char *link = __getname();
803 	char *target;
804 
805 	P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
806 
807 	if (!link) {
808 		link = ERR_PTR(-ENOMEM);
809 		goto ndset;
810 	}
811 	fid = v9fs_fid_lookup(dentry);
812 	if (IS_ERR(fid)) {
813 		__putname(link);
814 		link = ERR_PTR(PTR_ERR(fid));
815 		goto ndset;
816 	}
817 	retval = p9_client_readlink(fid, &target);
818 	if (!retval) {
819 		strcpy(link, target);
820 		kfree(target);
821 		goto ndset;
822 	}
823 	__putname(link);
824 	link = ERR_PTR(retval);
825 ndset:
826 	nd_set_link(nd, link);
827 	return NULL;
828 }
829 
830 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
831 {
832 	loff_t i_size;
833 	struct p9_stat_dotl *st;
834 	struct v9fs_session_info *v9ses;
835 
836 	v9ses = v9fs_inode2v9ses(inode);
837 	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
838 	if (IS_ERR(st))
839 		return PTR_ERR(st);
840 
841 	spin_lock(&inode->i_lock);
842 	/*
843 	 * We don't want to refresh inode->i_size,
844 	 * because we may have cached data
845 	 */
846 	i_size = inode->i_size;
847 	v9fs_stat2inode_dotl(st, inode);
848 	if (v9ses->cache)
849 		inode->i_size = i_size;
850 	spin_unlock(&inode->i_lock);
851 	kfree(st);
852 	return 0;
853 }
854 
855 const struct inode_operations v9fs_dir_inode_operations_dotl = {
856 	.create = v9fs_vfs_create_dotl,
857 	.lookup = v9fs_vfs_lookup,
858 	.link = v9fs_vfs_link_dotl,
859 	.symlink = v9fs_vfs_symlink_dotl,
860 	.unlink = v9fs_vfs_unlink,
861 	.mkdir = v9fs_vfs_mkdir_dotl,
862 	.rmdir = v9fs_vfs_rmdir,
863 	.mknod = v9fs_vfs_mknod_dotl,
864 	.rename = v9fs_vfs_rename,
865 	.getattr = v9fs_vfs_getattr_dotl,
866 	.setattr = v9fs_vfs_setattr_dotl,
867 	.setxattr = generic_setxattr,
868 	.getxattr = generic_getxattr,
869 	.removexattr = generic_removexattr,
870 	.listxattr = v9fs_listxattr,
871 	.check_acl = v9fs_check_acl,
872 };
873 
874 const struct inode_operations v9fs_file_inode_operations_dotl = {
875 	.getattr = v9fs_vfs_getattr_dotl,
876 	.setattr = v9fs_vfs_setattr_dotl,
877 	.setxattr = generic_setxattr,
878 	.getxattr = generic_getxattr,
879 	.removexattr = generic_removexattr,
880 	.listxattr = v9fs_listxattr,
881 	.check_acl = v9fs_check_acl,
882 };
883 
884 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
885 	.readlink = generic_readlink,
886 	.follow_link = v9fs_vfs_follow_link_dotl,
887 	.put_link = v9fs_vfs_put_link,
888 	.getattr = v9fs_vfs_getattr_dotl,
889 	.setattr = v9fs_vfs_setattr_dotl,
890 	.setxattr = generic_setxattr,
891 	.getxattr = generic_getxattr,
892 	.removexattr = generic_removexattr,
893 	.listxattr = v9fs_listxattr,
894 };
895