1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file contains vfs inode ops for the 9P2000.L protocol.
4 *
5 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
6 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
7 */
8
9#include <linux/module.h>
10#include <linux/errno.h>
11#include <linux/fs.h>
12#include <linux/file.h>
13#include <linux/pagemap.h>
14#include <linux/stat.h>
15#include <linux/string.h>
16#include <linux/inet.h>
17#include <linux/namei.h>
18#include <linux/idr.h>
19#include <linux/sched.h>
20#include <linux/slab.h>
21#include <linux/xattr.h>
22#include <linux/posix_acl.h>
23#include <net/9p/9p.h>
24#include <net/9p/client.h>
25
26#include "v9fs.h"
27#include "v9fs_vfs.h"
28#include "fid.h"
29#include "cache.h"
30#include "xattr.h"
31#include "acl.h"
32
33static int
34v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
35		    struct dentry *dentry, umode_t omode, dev_t rdev);
36
37/**
38 * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object
39 * @dir_inode: The directory inode
40 *
41 * Helper function to get the gid for creating a
42 * new file system object. This checks the S_ISGID to determine the owning
43 * group of the new file system object.
44 */
45
46static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
47{
48	BUG_ON(dir_inode == NULL);
49
50	if (dir_inode->i_mode & S_ISGID) {
51		/* set_gid bit is set.*/
52		return dir_inode->i_gid;
53	}
54	return current_fsgid();
55}
56
57static int v9fs_test_inode_dotl(struct inode *inode, void *data)
58{
59	struct v9fs_inode *v9inode = V9FS_I(inode);
60	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
61
62	/* don't match inode of different type */
63	if (inode_wrong_type(inode, st->st_mode))
64		return 0;
65
66	if (inode->i_generation != st->st_gen)
67		return 0;
68
69	/* compare qid details */
70	if (memcmp(&v9inode->qid.version,
71		   &st->qid.version, sizeof(v9inode->qid.version)))
72		return 0;
73
74	if (v9inode->qid.type != st->qid.type)
75		return 0;
76
77	if (v9inode->qid.path != st->qid.path)
78		return 0;
79	return 1;
80}
81
82/* Always get a new inode */
83static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
84{
85	return 0;
86}
87
88static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
89{
90	struct v9fs_inode *v9inode = V9FS_I(inode);
91	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
92
93	memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
94	inode->i_generation = st->st_gen;
95	return 0;
96}
97
98static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
99					struct p9_qid *qid,
100					struct p9_fid *fid,
101					struct p9_stat_dotl *st,
102					int new)
103{
104	int retval;
105	unsigned long i_ino;
106	struct inode *inode;
107	struct v9fs_session_info *v9ses = sb->s_fs_info;
108	int (*test)(struct inode *inode, void *data);
109
110	if (new)
111		test = v9fs_test_new_inode_dotl;
112	else
113		test = v9fs_test_inode_dotl;
114
115	i_ino = v9fs_qid2ino(qid);
116	inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
117	if (!inode)
118		return ERR_PTR(-ENOMEM);
119	if (!(inode->i_state & I_NEW))
120		return inode;
121	/*
122	 * initialize the inode with the stat info
123	 * FIXME!! we may need support for stale inodes
124	 * later.
125	 */
126	inode->i_ino = i_ino;
127	retval = v9fs_init_inode(v9ses, inode,
128				 st->st_mode, new_decode_dev(st->st_rdev));
129	if (retval)
130		goto error;
131
132	v9fs_stat2inode_dotl(st, inode, 0);
133	v9fs_cache_inode_get_cookie(inode);
134	retval = v9fs_get_acl(inode, fid);
135	if (retval)
136		goto error;
137
138	unlock_new_inode(inode);
139	return inode;
140error:
141	iget_failed(inode);
142	return ERR_PTR(retval);
143
144}
145
146struct inode *
147v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
148			 struct super_block *sb, int new)
149{
150	struct p9_stat_dotl *st;
151	struct inode *inode = NULL;
152
153	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
154	if (IS_ERR(st))
155		return ERR_CAST(st);
156
157	inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
158	kfree(st);
159	return inode;
160}
161
162struct dotl_openflag_map {
163	int open_flag;
164	int dotl_flag;
165};
166
167static int v9fs_mapped_dotl_flags(int flags)
168{
169	int i;
170	int rflags = 0;
171	struct dotl_openflag_map dotl_oflag_map[] = {
172		{ O_CREAT,	P9_DOTL_CREATE },
173		{ O_EXCL,	P9_DOTL_EXCL },
174		{ O_NOCTTY,	P9_DOTL_NOCTTY },
175		{ O_APPEND,	P9_DOTL_APPEND },
176		{ O_NONBLOCK,	P9_DOTL_NONBLOCK },
177		{ O_DSYNC,	P9_DOTL_DSYNC },
178		{ FASYNC,	P9_DOTL_FASYNC },
179		{ O_DIRECT,	P9_DOTL_DIRECT },
180		{ O_LARGEFILE,	P9_DOTL_LARGEFILE },
181		{ O_DIRECTORY,	P9_DOTL_DIRECTORY },
182		{ O_NOFOLLOW,	P9_DOTL_NOFOLLOW },
183		{ O_NOATIME,	P9_DOTL_NOATIME },
184		{ O_CLOEXEC,	P9_DOTL_CLOEXEC },
185		{ O_SYNC,	P9_DOTL_SYNC},
186	};
187	for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
188		if (flags & dotl_oflag_map[i].open_flag)
189			rflags |= dotl_oflag_map[i].dotl_flag;
190	}
191	return rflags;
192}
193
194/**
195 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
196 * plan 9 open flag.
197 * @flags: flags to convert
198 */
199int v9fs_open_to_dotl_flags(int flags)
200{
201	int rflags = 0;
202
203	/*
204	 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
205	 * and P9_DOTL_NOACCESS
206	 */
207	rflags |= flags & O_ACCMODE;
208	rflags |= v9fs_mapped_dotl_flags(flags);
209
210	return rflags;
211}
212
213/**
214 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
215 * @mnt_userns: The user namespace of the mount
216 * @dir: directory inode that is being created
217 * @dentry:  dentry that is being deleted
218 * @omode: create permissions
219 * @excl: True if the file must not yet exist
220 *
221 */
222static int
223v9fs_vfs_create_dotl(struct user_namespace *mnt_userns, struct inode *dir,
224		     struct dentry *dentry, umode_t omode, bool excl)
225{
226	return v9fs_vfs_mknod_dotl(mnt_userns, dir, dentry, omode, 0);
227}
228
229static int
230v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
231			  struct file *file, unsigned int flags, umode_t omode)
232{
233	int err = 0;
234	kgid_t gid;
235	umode_t mode;
236	const unsigned char *name = NULL;
237	struct p9_qid qid;
238	struct inode *inode;
239	struct p9_fid *fid = NULL;
240	struct v9fs_inode *v9inode;
241	struct p9_fid *dfid, *ofid, *inode_fid;
242	struct v9fs_session_info *v9ses;
243	struct posix_acl *pacl = NULL, *dacl = NULL;
244	struct dentry *res = NULL;
245
246	if (d_in_lookup(dentry)) {
247		res = v9fs_vfs_lookup(dir, dentry, 0);
248		if (IS_ERR(res))
249			return PTR_ERR(res);
250
251		if (res)
252			dentry = res;
253	}
254
255	/* Only creates */
256	if (!(flags & O_CREAT) || d_really_is_positive(dentry))
257		return	finish_no_open(file, res);
258
259	v9ses = v9fs_inode2v9ses(dir);
260
261	name = dentry->d_name.name;
262	p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
263		 name, flags, omode);
264
265	dfid = v9fs_parent_fid(dentry);
266	if (IS_ERR(dfid)) {
267		err = PTR_ERR(dfid);
268		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
269		goto out;
270	}
271
272	/* clone a fid to use for creation */
273	ofid = clone_fid(dfid);
274	if (IS_ERR(ofid)) {
275		err = PTR_ERR(ofid);
276		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
277		goto out;
278	}
279
280	gid = v9fs_get_fsgid_for_create(dir);
281
282	mode = omode;
283	/* Update mode based on ACL value */
284	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
285	if (err) {
286		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
287			 err);
288		goto error;
289	}
290	err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
291				    mode, gid, &qid);
292	if (err < 0) {
293		p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
294			 err);
295		goto error;
296	}
297	v9fs_invalidate_inode_attr(dir);
298
299	/* instantiate inode and assign the unopened fid to the dentry */
300	fid = p9_client_walk(dfid, 1, &name, 1);
301	p9_client_clunk(dfid);
302	if (IS_ERR(fid)) {
303		err = PTR_ERR(fid);
304		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
305		fid = NULL;
306		goto error;
307	}
308	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
309	if (IS_ERR(inode)) {
310		err = PTR_ERR(inode);
311		p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
312		goto error;
313	}
314	/* Now set the ACL based on the default value */
315	v9fs_set_create_acl(inode, fid, dacl, pacl);
316
317	v9fs_fid_add(dentry, fid);
318	d_instantiate(dentry, inode);
319
320	v9inode = V9FS_I(inode);
321	mutex_lock(&v9inode->v_mutex);
322	if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
323	    !v9inode->writeback_fid &&
324	    ((flags & O_ACCMODE) != O_RDONLY)) {
325		/*
326		 * clone a fid and add it to writeback_fid
327		 * we do it during open time instead of
328		 * page dirty time via write_begin/page_mkwrite
329		 * because we want write after unlink usecase
330		 * to work.
331		 */
332		inode_fid = v9fs_writeback_fid(dentry);
333		if (IS_ERR(inode_fid)) {
334			err = PTR_ERR(inode_fid);
335			mutex_unlock(&v9inode->v_mutex);
336			goto err_clunk_old_fid;
337		}
338		v9inode->writeback_fid = (void *) inode_fid;
339	}
340	mutex_unlock(&v9inode->v_mutex);
341	/* Since we are opening a file, assign the open fid to the file */
342	err = finish_open(file, dentry, generic_file_open);
343	if (err)
344		goto err_clunk_old_fid;
345	file->private_data = ofid;
346	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
347		fscache_use_cookie(v9fs_inode_cookie(v9inode),
348				   file->f_mode & FMODE_WRITE);
349	v9fs_open_fid_add(inode, ofid);
350	file->f_mode |= FMODE_CREATED;
351out:
352	v9fs_put_acl(dacl, pacl);
353	dput(res);
354	return err;
355
356error:
357	if (fid)
358		p9_client_clunk(fid);
359err_clunk_old_fid:
360	if (ofid)
361		p9_client_clunk(ofid);
362	goto out;
363}
364
365/**
366 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
367 * @mnt_userns: The user namespace of the mount
368 * @dir:  inode that is being unlinked
369 * @dentry: dentry that is being unlinked
370 * @omode: mode for new directory
371 *
372 */
373
374static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns,
375			       struct inode *dir, struct dentry *dentry,
376			       umode_t omode)
377{
378	int err;
379	struct v9fs_session_info *v9ses;
380	struct p9_fid *fid = NULL, *dfid = NULL;
381	kgid_t gid;
382	const unsigned char *name;
383	umode_t mode;
384	struct inode *inode;
385	struct p9_qid qid;
386	struct posix_acl *dacl = NULL, *pacl = NULL;
387
388	p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
389	err = 0;
390	v9ses = v9fs_inode2v9ses(dir);
391
392	omode |= S_IFDIR;
393	if (dir->i_mode & S_ISGID)
394		omode |= S_ISGID;
395
396	dfid = v9fs_parent_fid(dentry);
397	if (IS_ERR(dfid)) {
398		err = PTR_ERR(dfid);
399		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
400		dfid = NULL;
401		goto error;
402	}
403
404	gid = v9fs_get_fsgid_for_create(dir);
405	mode = omode;
406	/* Update mode based on ACL value */
407	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
408	if (err) {
409		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
410			 err);
411		goto error;
412	}
413	name = dentry->d_name.name;
414	err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
415	if (err < 0)
416		goto error;
417	fid = p9_client_walk(dfid, 1, &name, 1);
418	if (IS_ERR(fid)) {
419		err = PTR_ERR(fid);
420		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
421			 err);
422		fid = NULL;
423		goto error;
424	}
425
426	/* instantiate inode and assign the unopened fid to the dentry */
427	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
428		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
429		if (IS_ERR(inode)) {
430			err = PTR_ERR(inode);
431			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
432				 err);
433			goto error;
434		}
435		v9fs_fid_add(dentry, fid);
436		v9fs_set_create_acl(inode, fid, dacl, pacl);
437		d_instantiate(dentry, inode);
438		fid = NULL;
439		err = 0;
440	} else {
441		/*
442		 * Not in cached mode. No need to populate
443		 * inode with stat. We need to get an inode
444		 * so that we can set the acl with dentry
445		 */
446		inode = v9fs_get_inode(dir->i_sb, mode, 0);
447		if (IS_ERR(inode)) {
448			err = PTR_ERR(inode);
449			goto error;
450		}
451		v9fs_set_create_acl(inode, fid, dacl, pacl);
452		d_instantiate(dentry, inode);
453	}
454	inc_nlink(dir);
455	v9fs_invalidate_inode_attr(dir);
456error:
457	if (fid)
458		p9_client_clunk(fid);
459	v9fs_put_acl(dacl, pacl);
460	p9_client_clunk(dfid);
461	return err;
462}
463
464static int
465v9fs_vfs_getattr_dotl(struct user_namespace *mnt_userns,
466		      const struct path *path, struct kstat *stat,
467		      u32 request_mask, unsigned int flags)
468{
469	struct dentry *dentry = path->dentry;
470	struct v9fs_session_info *v9ses;
471	struct p9_fid *fid;
472	struct p9_stat_dotl *st;
473
474	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
475	v9ses = v9fs_dentry2v9ses(dentry);
476	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
477		generic_fillattr(&init_user_ns, d_inode(dentry), stat);
478		return 0;
479	}
480	fid = v9fs_fid_lookup(dentry);
481	if (IS_ERR(fid))
482		return PTR_ERR(fid);
483
484	/* Ask for all the fields in stat structure. Server will return
485	 * whatever it supports
486	 */
487
488	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
489	p9_client_clunk(fid);
490	if (IS_ERR(st))
491		return PTR_ERR(st);
492
493	v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
494	generic_fillattr(&init_user_ns, d_inode(dentry), stat);
495	/* Change block size to what the server returned */
496	stat->blksize = st->st_blksize;
497
498	kfree(st);
499	return 0;
500}
501
502/*
503 * Attribute flags.
504 */
505#define P9_ATTR_MODE		(1 << 0)
506#define P9_ATTR_UID		(1 << 1)
507#define P9_ATTR_GID		(1 << 2)
508#define P9_ATTR_SIZE		(1 << 3)
509#define P9_ATTR_ATIME		(1 << 4)
510#define P9_ATTR_MTIME		(1 << 5)
511#define P9_ATTR_CTIME		(1 << 6)
512#define P9_ATTR_ATIME_SET	(1 << 7)
513#define P9_ATTR_MTIME_SET	(1 << 8)
514
515struct dotl_iattr_map {
516	int iattr_valid;
517	int p9_iattr_valid;
518};
519
520static int v9fs_mapped_iattr_valid(int iattr_valid)
521{
522	int i;
523	int p9_iattr_valid = 0;
524	struct dotl_iattr_map dotl_iattr_map[] = {
525		{ ATTR_MODE,		P9_ATTR_MODE },
526		{ ATTR_UID,		P9_ATTR_UID },
527		{ ATTR_GID,		P9_ATTR_GID },
528		{ ATTR_SIZE,		P9_ATTR_SIZE },
529		{ ATTR_ATIME,		P9_ATTR_ATIME },
530		{ ATTR_MTIME,		P9_ATTR_MTIME },
531		{ ATTR_CTIME,		P9_ATTR_CTIME },
532		{ ATTR_ATIME_SET,	P9_ATTR_ATIME_SET },
533		{ ATTR_MTIME_SET,	P9_ATTR_MTIME_SET },
534	};
535	for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
536		if (iattr_valid & dotl_iattr_map[i].iattr_valid)
537			p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
538	}
539	return p9_iattr_valid;
540}
541
542/**
543 * v9fs_vfs_setattr_dotl - set file metadata
544 * @mnt_userns: The user namespace of the mount
545 * @dentry: file whose metadata to set
546 * @iattr: metadata assignment structure
547 *
548 */
549
550int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns,
551			  struct dentry *dentry, struct iattr *iattr)
552{
553	int retval, use_dentry = 0;
554	struct p9_fid *fid = NULL;
555	struct p9_iattr_dotl p9attr = {
556		.uid = INVALID_UID,
557		.gid = INVALID_GID,
558	};
559	struct inode *inode = d_inode(dentry);
560
561	p9_debug(P9_DEBUG_VFS, "\n");
562
563	retval = setattr_prepare(&init_user_ns, dentry, iattr);
564	if (retval)
565		return retval;
566
567	p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
568	if (iattr->ia_valid & ATTR_MODE)
569		p9attr.mode = iattr->ia_mode;
570	if (iattr->ia_valid & ATTR_UID)
571		p9attr.uid = iattr->ia_uid;
572	if (iattr->ia_valid & ATTR_GID)
573		p9attr.gid = iattr->ia_gid;
574	if (iattr->ia_valid & ATTR_SIZE)
575		p9attr.size = iattr->ia_size;
576	if (iattr->ia_valid & ATTR_ATIME_SET) {
577		p9attr.atime_sec = iattr->ia_atime.tv_sec;
578		p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
579	}
580	if (iattr->ia_valid & ATTR_MTIME_SET) {
581		p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
582		p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
583	}
584
585	if (iattr->ia_valid & ATTR_FILE) {
586		fid = iattr->ia_file->private_data;
587		WARN_ON(!fid);
588	}
589	if (!fid) {
590		fid = v9fs_fid_lookup(dentry);
591		use_dentry = 1;
592	}
593	if (IS_ERR(fid))
594		return PTR_ERR(fid);
595
596	/* Write all dirty data */
597	if (S_ISREG(inode->i_mode))
598		filemap_write_and_wait(inode->i_mapping);
599
600	retval = p9_client_setattr(fid, &p9attr);
601	if (retval < 0) {
602		if (use_dentry)
603			p9_client_clunk(fid);
604		return retval;
605	}
606
607	if ((iattr->ia_valid & ATTR_SIZE) &&
608	    iattr->ia_size != i_size_read(inode))
609		truncate_setsize(inode, iattr->ia_size);
610
611	v9fs_invalidate_inode_attr(inode);
612	setattr_copy(&init_user_ns, inode, iattr);
613	mark_inode_dirty(inode);
614	if (iattr->ia_valid & ATTR_MODE) {
615		/* We also want to update ACL when we update mode bits */
616		retval = v9fs_acl_chmod(inode, fid);
617		if (retval < 0) {
618			if (use_dentry)
619				p9_client_clunk(fid);
620			return retval;
621		}
622	}
623	if (use_dentry)
624		p9_client_clunk(fid);
625
626	return 0;
627}
628
629/**
630 * v9fs_stat2inode_dotl - populate an inode structure with stat info
631 * @stat: stat structure
632 * @inode: inode to populate
633 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
634 *
635 */
636
637void
638v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
639		      unsigned int flags)
640{
641	umode_t mode;
642	struct v9fs_inode *v9inode = V9FS_I(inode);
643
644	if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
645		inode->i_atime.tv_sec = stat->st_atime_sec;
646		inode->i_atime.tv_nsec = stat->st_atime_nsec;
647		inode->i_mtime.tv_sec = stat->st_mtime_sec;
648		inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
649		inode->i_ctime.tv_sec = stat->st_ctime_sec;
650		inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
651		inode->i_uid = stat->st_uid;
652		inode->i_gid = stat->st_gid;
653		set_nlink(inode, stat->st_nlink);
654
655		mode = stat->st_mode & S_IALLUGO;
656		mode |= inode->i_mode & ~S_IALLUGO;
657		inode->i_mode = mode;
658
659		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
660			v9fs_i_size_write(inode, stat->st_size);
661		inode->i_blocks = stat->st_blocks;
662	} else {
663		if (stat->st_result_mask & P9_STATS_ATIME) {
664			inode->i_atime.tv_sec = stat->st_atime_sec;
665			inode->i_atime.tv_nsec = stat->st_atime_nsec;
666		}
667		if (stat->st_result_mask & P9_STATS_MTIME) {
668			inode->i_mtime.tv_sec = stat->st_mtime_sec;
669			inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
670		}
671		if (stat->st_result_mask & P9_STATS_CTIME) {
672			inode->i_ctime.tv_sec = stat->st_ctime_sec;
673			inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
674		}
675		if (stat->st_result_mask & P9_STATS_UID)
676			inode->i_uid = stat->st_uid;
677		if (stat->st_result_mask & P9_STATS_GID)
678			inode->i_gid = stat->st_gid;
679		if (stat->st_result_mask & P9_STATS_NLINK)
680			set_nlink(inode, stat->st_nlink);
681		if (stat->st_result_mask & P9_STATS_MODE) {
682			mode = stat->st_mode & S_IALLUGO;
683			mode |= inode->i_mode & ~S_IALLUGO;
684			inode->i_mode = mode;
685		}
686		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
687		    stat->st_result_mask & P9_STATS_SIZE)
688			v9fs_i_size_write(inode, stat->st_size);
689		if (stat->st_result_mask & P9_STATS_BLOCKS)
690			inode->i_blocks = stat->st_blocks;
691	}
692	if (stat->st_result_mask & P9_STATS_GEN)
693		inode->i_generation = stat->st_gen;
694
695	/* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
696	 * because the inode structure does not have fields for them.
697	 */
698	v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
699}
700
701static int
702v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir,
703		      struct dentry *dentry, const char *symname)
704{
705	int err;
706	kgid_t gid;
707	const unsigned char *name;
708	struct p9_qid qid;
709	struct inode *inode;
710	struct p9_fid *dfid;
711	struct p9_fid *fid = NULL;
712	struct v9fs_session_info *v9ses;
713
714	name = dentry->d_name.name;
715	p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
716	v9ses = v9fs_inode2v9ses(dir);
717
718	dfid = v9fs_parent_fid(dentry);
719	if (IS_ERR(dfid)) {
720		err = PTR_ERR(dfid);
721		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
722		return err;
723	}
724
725	gid = v9fs_get_fsgid_for_create(dir);
726
727	/* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
728	err = p9_client_symlink(dfid, name, symname, gid, &qid);
729
730	if (err < 0) {
731		p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
732		goto error;
733	}
734
735	v9fs_invalidate_inode_attr(dir);
736	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
737		/* Now walk from the parent so we can get an unopened fid. */
738		fid = p9_client_walk(dfid, 1, &name, 1);
739		if (IS_ERR(fid)) {
740			err = PTR_ERR(fid);
741			p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
742				 err);
743			fid = NULL;
744			goto error;
745		}
746
747		/* instantiate inode and assign the unopened fid to dentry */
748		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
749		if (IS_ERR(inode)) {
750			err = PTR_ERR(inode);
751			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
752				 err);
753			goto error;
754		}
755		v9fs_fid_add(dentry, fid);
756		d_instantiate(dentry, inode);
757		fid = NULL;
758		err = 0;
759	} else {
760		/* Not in cached mode. No need to populate inode with stat */
761		inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
762		if (IS_ERR(inode)) {
763			err = PTR_ERR(inode);
764			goto error;
765		}
766		d_instantiate(dentry, inode);
767	}
768
769error:
770	if (fid)
771		p9_client_clunk(fid);
772
773	p9_client_clunk(dfid);
774	return err;
775}
776
777/**
778 * v9fs_vfs_link_dotl - create a hardlink for dotl
779 * @old_dentry: dentry for file to link to
780 * @dir: inode destination for new link
781 * @dentry: dentry for link
782 *
783 */
784
785static int
786v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
787		struct dentry *dentry)
788{
789	int err;
790	struct p9_fid *dfid, *oldfid;
791	struct v9fs_session_info *v9ses;
792
793	p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
794		 dir->i_ino, old_dentry, dentry);
795
796	v9ses = v9fs_inode2v9ses(dir);
797	dfid = v9fs_parent_fid(dentry);
798	if (IS_ERR(dfid))
799		return PTR_ERR(dfid);
800
801	oldfid = v9fs_fid_lookup(old_dentry);
802	if (IS_ERR(oldfid)) {
803		p9_client_clunk(dfid);
804		return PTR_ERR(oldfid);
805	}
806
807	err = p9_client_link(dfid, oldfid, dentry->d_name.name);
808
809	p9_client_clunk(dfid);
810	p9_client_clunk(oldfid);
811	if (err < 0) {
812		p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
813		return err;
814	}
815
816	v9fs_invalidate_inode_attr(dir);
817	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
818		/* Get the latest stat info from server. */
819		struct p9_fid *fid;
820
821		fid = v9fs_fid_lookup(old_dentry);
822		if (IS_ERR(fid))
823			return PTR_ERR(fid);
824
825		v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
826		p9_client_clunk(fid);
827	}
828	ihold(d_inode(old_dentry));
829	d_instantiate(dentry, d_inode(old_dentry));
830
831	return err;
832}
833
834/**
835 * v9fs_vfs_mknod_dotl - create a special file
836 * @mnt_userns: The user namespace of the mount
837 * @dir: inode destination for new link
838 * @dentry: dentry for file
839 * @omode: mode for creation
840 * @rdev: device associated with special file
841 *
842 */
843static int
844v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
845		    struct dentry *dentry, umode_t omode, dev_t rdev)
846{
847	int err;
848	kgid_t gid;
849	const unsigned char *name;
850	umode_t mode;
851	struct v9fs_session_info *v9ses;
852	struct p9_fid *fid = NULL, *dfid = NULL;
853	struct inode *inode;
854	struct p9_qid qid;
855	struct posix_acl *dacl = NULL, *pacl = NULL;
856
857	p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
858		 dir->i_ino, dentry, omode,
859		 MAJOR(rdev), MINOR(rdev));
860
861	v9ses = v9fs_inode2v9ses(dir);
862	dfid = v9fs_parent_fid(dentry);
863	if (IS_ERR(dfid)) {
864		err = PTR_ERR(dfid);
865		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
866		dfid = NULL;
867		goto error;
868	}
869
870	gid = v9fs_get_fsgid_for_create(dir);
871	mode = omode;
872	/* Update mode based on ACL value */
873	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
874	if (err) {
875		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
876			 err);
877		goto error;
878	}
879	name = dentry->d_name.name;
880
881	err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
882	if (err < 0)
883		goto error;
884
885	v9fs_invalidate_inode_attr(dir);
886	fid = p9_client_walk(dfid, 1, &name, 1);
887	if (IS_ERR(fid)) {
888		err = PTR_ERR(fid);
889		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
890			 err);
891		fid = NULL;
892		goto error;
893	}
894
895	/* instantiate inode and assign the unopened fid to the dentry */
896	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
897		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
898		if (IS_ERR(inode)) {
899			err = PTR_ERR(inode);
900			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
901				 err);
902			goto error;
903		}
904		v9fs_set_create_acl(inode, fid, dacl, pacl);
905		v9fs_fid_add(dentry, fid);
906		d_instantiate(dentry, inode);
907		fid = NULL;
908		err = 0;
909	} else {
910		/*
911		 * Not in cached mode. No need to populate inode with stat.
912		 * socket syscall returns a fd, so we need instantiate
913		 */
914		inode = v9fs_get_inode(dir->i_sb, mode, rdev);
915		if (IS_ERR(inode)) {
916			err = PTR_ERR(inode);
917			goto error;
918		}
919		v9fs_set_create_acl(inode, fid, dacl, pacl);
920		d_instantiate(dentry, inode);
921	}
922error:
923	if (fid)
924		p9_client_clunk(fid);
925	v9fs_put_acl(dacl, pacl);
926	p9_client_clunk(dfid);
927
928	return err;
929}
930
931/**
932 * v9fs_vfs_get_link_dotl - follow a symlink path
933 * @dentry: dentry for symlink
934 * @inode: inode for symlink
935 * @done: destructor for return value
936 */
937
938static const char *
939v9fs_vfs_get_link_dotl(struct dentry *dentry,
940		       struct inode *inode,
941		       struct delayed_call *done)
942{
943	struct p9_fid *fid;
944	char *target;
945	int retval;
946
947	if (!dentry)
948		return ERR_PTR(-ECHILD);
949
950	p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
951
952	fid = v9fs_fid_lookup(dentry);
953	if (IS_ERR(fid))
954		return ERR_CAST(fid);
955	retval = p9_client_readlink(fid, &target);
956	p9_client_clunk(fid);
957	if (retval)
958		return ERR_PTR(retval);
959	set_delayed_call(done, kfree_link, target);
960	return target;
961}
962
963int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
964{
965	struct p9_stat_dotl *st;
966	struct v9fs_session_info *v9ses;
967	unsigned int flags;
968
969	v9ses = v9fs_inode2v9ses(inode);
970	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
971	if (IS_ERR(st))
972		return PTR_ERR(st);
973	/*
974	 * Don't update inode if the file type is different
975	 */
976	if (inode_wrong_type(inode, st->st_mode))
977		goto out;
978
979	/*
980	 * We don't want to refresh inode->i_size,
981	 * because we may have cached data
982	 */
983	flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
984		V9FS_STAT2INODE_KEEP_ISIZE : 0;
985	v9fs_stat2inode_dotl(st, inode, flags);
986out:
987	kfree(st);
988	return 0;
989}
990
991const struct inode_operations v9fs_dir_inode_operations_dotl = {
992	.create = v9fs_vfs_create_dotl,
993	.atomic_open = v9fs_vfs_atomic_open_dotl,
994	.lookup = v9fs_vfs_lookup,
995	.link = v9fs_vfs_link_dotl,
996	.symlink = v9fs_vfs_symlink_dotl,
997	.unlink = v9fs_vfs_unlink,
998	.mkdir = v9fs_vfs_mkdir_dotl,
999	.rmdir = v9fs_vfs_rmdir,
1000	.mknod = v9fs_vfs_mknod_dotl,
1001	.rename = v9fs_vfs_rename,
1002	.getattr = v9fs_vfs_getattr_dotl,
1003	.setattr = v9fs_vfs_setattr_dotl,
1004	.listxattr = v9fs_listxattr,
1005	.get_acl = v9fs_iop_get_acl,
1006};
1007
1008const struct inode_operations v9fs_file_inode_operations_dotl = {
1009	.getattr = v9fs_vfs_getattr_dotl,
1010	.setattr = v9fs_vfs_setattr_dotl,
1011	.listxattr = v9fs_listxattr,
1012	.get_acl = v9fs_iop_get_acl,
1013};
1014
1015const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1016	.get_link = v9fs_vfs_get_link_dotl,
1017	.getattr = v9fs_vfs_getattr_dotl,
1018	.setattr = v9fs_vfs_setattr_dotl,
1019	.listxattr = v9fs_listxattr,
1020};
1021