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 = NULL, *ofid = NULL, *inode_fid = NULL;
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 out;
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 out;
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	if (IS_ERR(fid)) {
302		err = PTR_ERR(fid);
303		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
304		goto out;
305	}
306	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
307	if (IS_ERR(inode)) {
308		err = PTR_ERR(inode);
309		p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
310		goto out;
311	}
312	/* Now set the ACL based on the default value */
313	v9fs_set_create_acl(inode, fid, dacl, pacl);
314
315	v9fs_fid_add(dentry, &fid);
316	d_instantiate(dentry, inode);
317
318	v9inode = V9FS_I(inode);
319	mutex_lock(&v9inode->v_mutex);
320	if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
321	    !v9inode->writeback_fid &&
322	    ((flags & O_ACCMODE) != O_RDONLY)) {
323		/*
324		 * clone a fid and add it to writeback_fid
325		 * we do it during open time instead of
326		 * page dirty time via write_begin/page_mkwrite
327		 * because we want write after unlink usecase
328		 * to work.
329		 */
330		inode_fid = v9fs_writeback_fid(dentry);
331		if (IS_ERR(inode_fid)) {
332			err = PTR_ERR(inode_fid);
333			mutex_unlock(&v9inode->v_mutex);
334			goto out;
335		}
336		v9inode->writeback_fid = (void *) inode_fid;
337	}
338	mutex_unlock(&v9inode->v_mutex);
339	/* Since we are opening a file, assign the open fid to the file */
340	err = finish_open(file, dentry, generic_file_open);
341	if (err)
342		goto out;
343	file->private_data = ofid;
344	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
345		fscache_use_cookie(v9fs_inode_cookie(v9inode),
346				   file->f_mode & FMODE_WRITE);
347	v9fs_open_fid_add(inode, &ofid);
348	file->f_mode |= FMODE_CREATED;
349out:
350	p9_fid_put(dfid);
351	p9_fid_put(ofid);
352	p9_fid_put(fid);
353	v9fs_put_acl(dacl, pacl);
354	dput(res);
355	return err;
356}
357
358/**
359 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
360 * @mnt_userns: The user namespace of the mount
361 * @dir:  inode that is being unlinked
362 * @dentry: dentry that is being unlinked
363 * @omode: mode for new directory
364 *
365 */
366
367static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns,
368			       struct inode *dir, struct dentry *dentry,
369			       umode_t omode)
370{
371	int err;
372	struct v9fs_session_info *v9ses;
373	struct p9_fid *fid = NULL, *dfid = NULL;
374	kgid_t gid;
375	const unsigned char *name;
376	umode_t mode;
377	struct inode *inode;
378	struct p9_qid qid;
379	struct posix_acl *dacl = NULL, *pacl = NULL;
380
381	p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
382	err = 0;
383	v9ses = v9fs_inode2v9ses(dir);
384
385	omode |= S_IFDIR;
386	if (dir->i_mode & S_ISGID)
387		omode |= S_ISGID;
388
389	dfid = v9fs_parent_fid(dentry);
390	if (IS_ERR(dfid)) {
391		err = PTR_ERR(dfid);
392		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
393		goto error;
394	}
395
396	gid = v9fs_get_fsgid_for_create(dir);
397	mode = omode;
398	/* Update mode based on ACL value */
399	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
400	if (err) {
401		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
402			 err);
403		goto error;
404	}
405	name = dentry->d_name.name;
406	err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
407	if (err < 0)
408		goto error;
409	fid = p9_client_walk(dfid, 1, &name, 1);
410	if (IS_ERR(fid)) {
411		err = PTR_ERR(fid);
412		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
413			 err);
414		goto error;
415	}
416
417	/* instantiate inode and assign the unopened fid to the dentry */
418	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
419		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
420		if (IS_ERR(inode)) {
421			err = PTR_ERR(inode);
422			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
423				 err);
424			goto error;
425		}
426		v9fs_fid_add(dentry, &fid);
427		v9fs_set_create_acl(inode, fid, dacl, pacl);
428		d_instantiate(dentry, inode);
429		err = 0;
430	} else {
431		/*
432		 * Not in cached mode. No need to populate
433		 * inode with stat. We need to get an inode
434		 * so that we can set the acl with dentry
435		 */
436		inode = v9fs_get_inode(dir->i_sb, mode, 0);
437		if (IS_ERR(inode)) {
438			err = PTR_ERR(inode);
439			goto error;
440		}
441		v9fs_set_create_acl(inode, fid, dacl, pacl);
442		d_instantiate(dentry, inode);
443	}
444	inc_nlink(dir);
445	v9fs_invalidate_inode_attr(dir);
446error:
447	p9_fid_put(fid);
448	v9fs_put_acl(dacl, pacl);
449	p9_fid_put(dfid);
450	return err;
451}
452
453static int
454v9fs_vfs_getattr_dotl(struct user_namespace *mnt_userns,
455		      const struct path *path, struct kstat *stat,
456		      u32 request_mask, unsigned int flags)
457{
458	struct dentry *dentry = path->dentry;
459	struct v9fs_session_info *v9ses;
460	struct p9_fid *fid;
461	struct p9_stat_dotl *st;
462
463	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
464	v9ses = v9fs_dentry2v9ses(dentry);
465	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
466		generic_fillattr(&init_user_ns, d_inode(dentry), stat);
467		return 0;
468	}
469	fid = v9fs_fid_lookup(dentry);
470	if (IS_ERR(fid))
471		return PTR_ERR(fid);
472
473	/* Ask for all the fields in stat structure. Server will return
474	 * whatever it supports
475	 */
476
477	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
478	p9_fid_put(fid);
479	if (IS_ERR(st))
480		return PTR_ERR(st);
481
482	v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
483	generic_fillattr(&init_user_ns, d_inode(dentry), stat);
484	/* Change block size to what the server returned */
485	stat->blksize = st->st_blksize;
486
487	kfree(st);
488	return 0;
489}
490
491/*
492 * Attribute flags.
493 */
494#define P9_ATTR_MODE		(1 << 0)
495#define P9_ATTR_UID		(1 << 1)
496#define P9_ATTR_GID		(1 << 2)
497#define P9_ATTR_SIZE		(1 << 3)
498#define P9_ATTR_ATIME		(1 << 4)
499#define P9_ATTR_MTIME		(1 << 5)
500#define P9_ATTR_CTIME		(1 << 6)
501#define P9_ATTR_ATIME_SET	(1 << 7)
502#define P9_ATTR_MTIME_SET	(1 << 8)
503
504struct dotl_iattr_map {
505	int iattr_valid;
506	int p9_iattr_valid;
507};
508
509static int v9fs_mapped_iattr_valid(int iattr_valid)
510{
511	int i;
512	int p9_iattr_valid = 0;
513	struct dotl_iattr_map dotl_iattr_map[] = {
514		{ ATTR_MODE,		P9_ATTR_MODE },
515		{ ATTR_UID,		P9_ATTR_UID },
516		{ ATTR_GID,		P9_ATTR_GID },
517		{ ATTR_SIZE,		P9_ATTR_SIZE },
518		{ ATTR_ATIME,		P9_ATTR_ATIME },
519		{ ATTR_MTIME,		P9_ATTR_MTIME },
520		{ ATTR_CTIME,		P9_ATTR_CTIME },
521		{ ATTR_ATIME_SET,	P9_ATTR_ATIME_SET },
522		{ ATTR_MTIME_SET,	P9_ATTR_MTIME_SET },
523	};
524	for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
525		if (iattr_valid & dotl_iattr_map[i].iattr_valid)
526			p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
527	}
528	return p9_iattr_valid;
529}
530
531/**
532 * v9fs_vfs_setattr_dotl - set file metadata
533 * @mnt_userns: The user namespace of the mount
534 * @dentry: file whose metadata to set
535 * @iattr: metadata assignment structure
536 *
537 */
538
539int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns,
540			  struct dentry *dentry, struct iattr *iattr)
541{
542	int retval, use_dentry = 0;
543	struct p9_fid *fid = NULL;
544	struct p9_iattr_dotl p9attr = {
545		.uid = INVALID_UID,
546		.gid = INVALID_GID,
547	};
548	struct inode *inode = d_inode(dentry);
549
550	p9_debug(P9_DEBUG_VFS, "\n");
551
552	retval = setattr_prepare(&init_user_ns, dentry, iattr);
553	if (retval)
554		return retval;
555
556	p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
557	if (iattr->ia_valid & ATTR_MODE)
558		p9attr.mode = iattr->ia_mode;
559	if (iattr->ia_valid & ATTR_UID)
560		p9attr.uid = iattr->ia_uid;
561	if (iattr->ia_valid & ATTR_GID)
562		p9attr.gid = iattr->ia_gid;
563	if (iattr->ia_valid & ATTR_SIZE)
564		p9attr.size = iattr->ia_size;
565	if (iattr->ia_valid & ATTR_ATIME_SET) {
566		p9attr.atime_sec = iattr->ia_atime.tv_sec;
567		p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
568	}
569	if (iattr->ia_valid & ATTR_MTIME_SET) {
570		p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
571		p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
572	}
573
574	if (iattr->ia_valid & ATTR_FILE) {
575		fid = iattr->ia_file->private_data;
576		WARN_ON(!fid);
577	}
578	if (!fid) {
579		fid = v9fs_fid_lookup(dentry);
580		use_dentry = 1;
581	}
582	if (IS_ERR(fid))
583		return PTR_ERR(fid);
584
585	/* Write all dirty data */
586	if (S_ISREG(inode->i_mode))
587		filemap_write_and_wait(inode->i_mapping);
588
589	retval = p9_client_setattr(fid, &p9attr);
590	if (retval < 0) {
591		if (use_dentry)
592			p9_fid_put(fid);
593		return retval;
594	}
595
596	if ((iattr->ia_valid & ATTR_SIZE) &&
597	    iattr->ia_size != i_size_read(inode))
598		truncate_setsize(inode, iattr->ia_size);
599
600	v9fs_invalidate_inode_attr(inode);
601	setattr_copy(&init_user_ns, inode, iattr);
602	mark_inode_dirty(inode);
603	if (iattr->ia_valid & ATTR_MODE) {
604		/* We also want to update ACL when we update mode bits */
605		retval = v9fs_acl_chmod(inode, fid);
606		if (retval < 0) {
607			if (use_dentry)
608				p9_fid_put(fid);
609			return retval;
610		}
611	}
612	if (use_dentry)
613		p9_fid_put(fid);
614
615	return 0;
616}
617
618/**
619 * v9fs_stat2inode_dotl - populate an inode structure with stat info
620 * @stat: stat structure
621 * @inode: inode to populate
622 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
623 *
624 */
625
626void
627v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
628		      unsigned int flags)
629{
630	umode_t mode;
631	struct v9fs_inode *v9inode = V9FS_I(inode);
632
633	if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
634		inode->i_atime.tv_sec = stat->st_atime_sec;
635		inode->i_atime.tv_nsec = stat->st_atime_nsec;
636		inode->i_mtime.tv_sec = stat->st_mtime_sec;
637		inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
638		inode->i_ctime.tv_sec = stat->st_ctime_sec;
639		inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
640		inode->i_uid = stat->st_uid;
641		inode->i_gid = stat->st_gid;
642		set_nlink(inode, stat->st_nlink);
643
644		mode = stat->st_mode & S_IALLUGO;
645		mode |= inode->i_mode & ~S_IALLUGO;
646		inode->i_mode = mode;
647
648		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
649			v9fs_i_size_write(inode, stat->st_size);
650		inode->i_blocks = stat->st_blocks;
651	} else {
652		if (stat->st_result_mask & P9_STATS_ATIME) {
653			inode->i_atime.tv_sec = stat->st_atime_sec;
654			inode->i_atime.tv_nsec = stat->st_atime_nsec;
655		}
656		if (stat->st_result_mask & P9_STATS_MTIME) {
657			inode->i_mtime.tv_sec = stat->st_mtime_sec;
658			inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
659		}
660		if (stat->st_result_mask & P9_STATS_CTIME) {
661			inode->i_ctime.tv_sec = stat->st_ctime_sec;
662			inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
663		}
664		if (stat->st_result_mask & P9_STATS_UID)
665			inode->i_uid = stat->st_uid;
666		if (stat->st_result_mask & P9_STATS_GID)
667			inode->i_gid = stat->st_gid;
668		if (stat->st_result_mask & P9_STATS_NLINK)
669			set_nlink(inode, stat->st_nlink);
670		if (stat->st_result_mask & P9_STATS_MODE) {
671			mode = stat->st_mode & S_IALLUGO;
672			mode |= inode->i_mode & ~S_IALLUGO;
673			inode->i_mode = mode;
674		}
675		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
676		    stat->st_result_mask & P9_STATS_SIZE)
677			v9fs_i_size_write(inode, stat->st_size);
678		if (stat->st_result_mask & P9_STATS_BLOCKS)
679			inode->i_blocks = stat->st_blocks;
680	}
681	if (stat->st_result_mask & P9_STATS_GEN)
682		inode->i_generation = stat->st_gen;
683
684	/* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
685	 * because the inode structure does not have fields for them.
686	 */
687	v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
688}
689
690static int
691v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir,
692		      struct dentry *dentry, const char *symname)
693{
694	int err;
695	kgid_t gid;
696	const unsigned char *name;
697	struct p9_qid qid;
698	struct inode *inode;
699	struct p9_fid *dfid;
700	struct p9_fid *fid = NULL;
701	struct v9fs_session_info *v9ses;
702
703	name = dentry->d_name.name;
704	p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
705	v9ses = v9fs_inode2v9ses(dir);
706
707	dfid = v9fs_parent_fid(dentry);
708	if (IS_ERR(dfid)) {
709		err = PTR_ERR(dfid);
710		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
711		return err;
712	}
713
714	gid = v9fs_get_fsgid_for_create(dir);
715
716	/* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
717	err = p9_client_symlink(dfid, name, symname, gid, &qid);
718
719	if (err < 0) {
720		p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
721		goto error;
722	}
723
724	v9fs_invalidate_inode_attr(dir);
725	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
726		/* Now walk from the parent so we can get an unopened fid. */
727		fid = p9_client_walk(dfid, 1, &name, 1);
728		if (IS_ERR(fid)) {
729			err = PTR_ERR(fid);
730			p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
731				 err);
732			goto error;
733		}
734
735		/* instantiate inode and assign the unopened fid to dentry */
736		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
737		if (IS_ERR(inode)) {
738			err = PTR_ERR(inode);
739			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
740				 err);
741			goto error;
742		}
743		v9fs_fid_add(dentry, &fid);
744		d_instantiate(dentry, inode);
745		err = 0;
746	} else {
747		/* Not in cached mode. No need to populate inode with stat */
748		inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
749		if (IS_ERR(inode)) {
750			err = PTR_ERR(inode);
751			goto error;
752		}
753		d_instantiate(dentry, inode);
754	}
755
756error:
757	p9_fid_put(fid);
758	p9_fid_put(dfid);
759	return err;
760}
761
762/**
763 * v9fs_vfs_link_dotl - create a hardlink for dotl
764 * @old_dentry: dentry for file to link to
765 * @dir: inode destination for new link
766 * @dentry: dentry for link
767 *
768 */
769
770static int
771v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
772		struct dentry *dentry)
773{
774	int err;
775	struct p9_fid *dfid, *oldfid;
776	struct v9fs_session_info *v9ses;
777
778	p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
779		 dir->i_ino, old_dentry, dentry);
780
781	v9ses = v9fs_inode2v9ses(dir);
782	dfid = v9fs_parent_fid(dentry);
783	if (IS_ERR(dfid))
784		return PTR_ERR(dfid);
785
786	oldfid = v9fs_fid_lookup(old_dentry);
787	if (IS_ERR(oldfid)) {
788		p9_fid_put(dfid);
789		return PTR_ERR(oldfid);
790	}
791
792	err = p9_client_link(dfid, oldfid, dentry->d_name.name);
793
794	p9_fid_put(dfid);
795	p9_fid_put(oldfid);
796	if (err < 0) {
797		p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
798		return err;
799	}
800
801	v9fs_invalidate_inode_attr(dir);
802	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
803		/* Get the latest stat info from server. */
804		struct p9_fid *fid;
805
806		fid = v9fs_fid_lookup(old_dentry);
807		if (IS_ERR(fid))
808			return PTR_ERR(fid);
809
810		v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
811		p9_fid_put(fid);
812	}
813	ihold(d_inode(old_dentry));
814	d_instantiate(dentry, d_inode(old_dentry));
815
816	return err;
817}
818
819/**
820 * v9fs_vfs_mknod_dotl - create a special file
821 * @mnt_userns: The user namespace of the mount
822 * @dir: inode destination for new link
823 * @dentry: dentry for file
824 * @omode: mode for creation
825 * @rdev: device associated with special file
826 *
827 */
828static int
829v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
830		    struct dentry *dentry, umode_t omode, dev_t rdev)
831{
832	int err;
833	kgid_t gid;
834	const unsigned char *name;
835	umode_t mode;
836	struct v9fs_session_info *v9ses;
837	struct p9_fid *fid = NULL, *dfid = NULL;
838	struct inode *inode;
839	struct p9_qid qid;
840	struct posix_acl *dacl = NULL, *pacl = NULL;
841
842	p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
843		 dir->i_ino, dentry, omode,
844		 MAJOR(rdev), MINOR(rdev));
845
846	v9ses = v9fs_inode2v9ses(dir);
847	dfid = v9fs_parent_fid(dentry);
848	if (IS_ERR(dfid)) {
849		err = PTR_ERR(dfid);
850		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
851		goto error;
852	}
853
854	gid = v9fs_get_fsgid_for_create(dir);
855	mode = omode;
856	/* Update mode based on ACL value */
857	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
858	if (err) {
859		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
860			 err);
861		goto error;
862	}
863	name = dentry->d_name.name;
864
865	err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
866	if (err < 0)
867		goto error;
868
869	v9fs_invalidate_inode_attr(dir);
870	fid = p9_client_walk(dfid, 1, &name, 1);
871	if (IS_ERR(fid)) {
872		err = PTR_ERR(fid);
873		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
874			 err);
875		goto error;
876	}
877
878	/* instantiate inode and assign the unopened fid to the dentry */
879	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
880		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
881		if (IS_ERR(inode)) {
882			err = PTR_ERR(inode);
883			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
884				 err);
885			goto error;
886		}
887		v9fs_set_create_acl(inode, fid, dacl, pacl);
888		v9fs_fid_add(dentry, &fid);
889		d_instantiate(dentry, inode);
890		err = 0;
891	} else {
892		/*
893		 * Not in cached mode. No need to populate inode with stat.
894		 * socket syscall returns a fd, so we need instantiate
895		 */
896		inode = v9fs_get_inode(dir->i_sb, mode, rdev);
897		if (IS_ERR(inode)) {
898			err = PTR_ERR(inode);
899			goto error;
900		}
901		v9fs_set_create_acl(inode, fid, dacl, pacl);
902		d_instantiate(dentry, inode);
903	}
904error:
905	p9_fid_put(fid);
906	v9fs_put_acl(dacl, pacl);
907	p9_fid_put(dfid);
908
909	return err;
910}
911
912/**
913 * v9fs_vfs_get_link_dotl - follow a symlink path
914 * @dentry: dentry for symlink
915 * @inode: inode for symlink
916 * @done: destructor for return value
917 */
918
919static const char *
920v9fs_vfs_get_link_dotl(struct dentry *dentry,
921		       struct inode *inode,
922		       struct delayed_call *done)
923{
924	struct p9_fid *fid;
925	char *target;
926	int retval;
927
928	if (!dentry)
929		return ERR_PTR(-ECHILD);
930
931	p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
932
933	fid = v9fs_fid_lookup(dentry);
934	if (IS_ERR(fid))
935		return ERR_CAST(fid);
936	retval = p9_client_readlink(fid, &target);
937	p9_fid_put(fid);
938	if (retval)
939		return ERR_PTR(retval);
940	set_delayed_call(done, kfree_link, target);
941	return target;
942}
943
944int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
945{
946	struct p9_stat_dotl *st;
947	struct v9fs_session_info *v9ses;
948	unsigned int flags;
949
950	v9ses = v9fs_inode2v9ses(inode);
951	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
952	if (IS_ERR(st))
953		return PTR_ERR(st);
954	/*
955	 * Don't update inode if the file type is different
956	 */
957	if (inode_wrong_type(inode, st->st_mode))
958		goto out;
959
960	/*
961	 * We don't want to refresh inode->i_size,
962	 * because we may have cached data
963	 */
964	flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
965		V9FS_STAT2INODE_KEEP_ISIZE : 0;
966	v9fs_stat2inode_dotl(st, inode, flags);
967out:
968	kfree(st);
969	return 0;
970}
971
972const struct inode_operations v9fs_dir_inode_operations_dotl = {
973	.create = v9fs_vfs_create_dotl,
974	.atomic_open = v9fs_vfs_atomic_open_dotl,
975	.lookup = v9fs_vfs_lookup,
976	.link = v9fs_vfs_link_dotl,
977	.symlink = v9fs_vfs_symlink_dotl,
978	.unlink = v9fs_vfs_unlink,
979	.mkdir = v9fs_vfs_mkdir_dotl,
980	.rmdir = v9fs_vfs_rmdir,
981	.mknod = v9fs_vfs_mknod_dotl,
982	.rename = v9fs_vfs_rename,
983	.getattr = v9fs_vfs_getattr_dotl,
984	.setattr = v9fs_vfs_setattr_dotl,
985	.listxattr = v9fs_listxattr,
986	.get_acl = v9fs_iop_get_acl,
987};
988
989const struct inode_operations v9fs_file_inode_operations_dotl = {
990	.getattr = v9fs_vfs_getattr_dotl,
991	.setattr = v9fs_vfs_setattr_dotl,
992	.listxattr = v9fs_listxattr,
993	.get_acl = v9fs_iop_get_acl,
994};
995
996const struct inode_operations v9fs_symlink_inode_operations_dotl = {
997	.get_link = v9fs_vfs_get_link_dotl,
998	.getattr = v9fs_vfs_getattr_dotl,
999	.setattr = v9fs_vfs_setattr_dotl,
1000	.listxattr = v9fs_listxattr,
1001};
1002