xref: /kernel/linux/linux-5.10/fs/9p/vfs_inode_dotl.c (revision 8c2ecf20)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  linux/fs/9p/vfs_inode_dotl.c
4 *
5 * This file contains vfs inode ops for the 9P2000.L protocol.
6 *
7 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 */
10
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/fs.h>
14#include <linux/file.h>
15#include <linux/pagemap.h>
16#include <linux/stat.h>
17#include <linux/string.h>
18#include <linux/inet.h>
19#include <linux/namei.h>
20#include <linux/idr.h>
21#include <linux/sched.h>
22#include <linux/slab.h>
23#include <linux/xattr.h>
24#include <linux/posix_acl.h>
25#include <net/9p/9p.h>
26#include <net/9p/client.h>
27
28#include "v9fs.h"
29#include "v9fs_vfs.h"
30#include "fid.h"
31#include "cache.h"
32#include "xattr.h"
33#include "acl.h"
34
35static int
36v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
37		    dev_t rdev);
38
39/**
40 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
41 * new file system object. This checks the S_ISGID to determine the owning
42 * group of the new file system object.
43 */
44
45static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
46{
47	BUG_ON(dir_inode == NULL);
48
49	if (dir_inode->i_mode & S_ISGID) {
50		/* set_gid bit is set.*/
51		return dir_inode->i_gid;
52	}
53	return current_fsgid();
54}
55
56static int v9fs_test_inode_dotl(struct inode *inode, void *data)
57{
58	struct v9fs_inode *v9inode = V9FS_I(inode);
59	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
60
61	/* don't match inode of different type */
62	if (inode_wrong_type(inode, st->st_mode))
63		return 0;
64
65	if (inode->i_generation != st->st_gen)
66		return 0;
67
68	/* compare qid details */
69	if (memcmp(&v9inode->qid.version,
70		   &st->qid.version, sizeof(v9inode->qid.version)))
71		return 0;
72
73	if (v9inode->qid.type != st->qid.type)
74		return 0;
75
76	if (v9inode->qid.path != st->qid.path)
77		return 0;
78	return 1;
79}
80
81/* Always get a new inode */
82static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
83{
84	return 0;
85}
86
87static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
88{
89	struct v9fs_inode *v9inode = V9FS_I(inode);
90	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
91
92	memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
93	inode->i_generation = st->st_gen;
94	return 0;
95}
96
97static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
98					struct p9_qid *qid,
99					struct p9_fid *fid,
100					struct p9_stat_dotl *st,
101					int new)
102{
103	int retval;
104	unsigned long i_ino;
105	struct inode *inode;
106	struct v9fs_session_info *v9ses = sb->s_fs_info;
107	int (*test)(struct inode *, void *);
108
109	if (new)
110		test = v9fs_test_new_inode_dotl;
111	else
112		test = v9fs_test_inode_dotl;
113
114	i_ino = v9fs_qid2ino(qid);
115	inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
116	if (!inode)
117		return ERR_PTR(-ENOMEM);
118	if (!(inode->i_state & I_NEW))
119		return inode;
120	/*
121	 * initialize the inode with the stat info
122	 * FIXME!! we may need support for stale inodes
123	 * later.
124	 */
125	inode->i_ino = i_ino;
126	retval = v9fs_init_inode(v9ses, inode,
127				 st->st_mode, new_decode_dev(st->st_rdev));
128	if (retval)
129		goto error;
130
131	v9fs_stat2inode_dotl(st, inode, 0);
132	v9fs_cache_inode_get_cookie(inode);
133	retval = v9fs_get_acl(inode, fid);
134	if (retval)
135		goto error;
136
137	unlock_new_inode(inode);
138	return inode;
139error:
140	iget_failed(inode);
141	return ERR_PTR(retval);
142
143}
144
145struct inode *
146v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
147			 struct super_block *sb, int new)
148{
149	struct p9_stat_dotl *st;
150	struct inode *inode = NULL;
151
152	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
153	if (IS_ERR(st))
154		return ERR_CAST(st);
155
156	inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
157	kfree(st);
158	return inode;
159}
160
161struct dotl_openflag_map {
162	int open_flag;
163	int dotl_flag;
164};
165
166static int v9fs_mapped_dotl_flags(int flags)
167{
168	int i;
169	int rflags = 0;
170	struct dotl_openflag_map dotl_oflag_map[] = {
171		{ O_CREAT,	P9_DOTL_CREATE },
172		{ O_EXCL,	P9_DOTL_EXCL },
173		{ O_NOCTTY,	P9_DOTL_NOCTTY },
174		{ O_APPEND,	P9_DOTL_APPEND },
175		{ O_NONBLOCK,	P9_DOTL_NONBLOCK },
176		{ O_DSYNC,	P9_DOTL_DSYNC },
177		{ FASYNC,	P9_DOTL_FASYNC },
178		{ O_DIRECT,	P9_DOTL_DIRECT },
179		{ O_LARGEFILE,	P9_DOTL_LARGEFILE },
180		{ O_DIRECTORY,	P9_DOTL_DIRECTORY },
181		{ O_NOFOLLOW,	P9_DOTL_NOFOLLOW },
182		{ O_NOATIME,	P9_DOTL_NOATIME },
183		{ O_CLOEXEC,	P9_DOTL_CLOEXEC },
184		{ O_SYNC,	P9_DOTL_SYNC},
185	};
186	for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
187		if (flags & dotl_oflag_map[i].open_flag)
188			rflags |= dotl_oflag_map[i].dotl_flag;
189	}
190	return rflags;
191}
192
193/**
194 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
195 * plan 9 open flag.
196 * @flags: flags to convert
197 */
198int v9fs_open_to_dotl_flags(int flags)
199{
200	int rflags = 0;
201
202	/*
203	 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
204	 * and P9_DOTL_NOACCESS
205	 */
206	rflags |= flags & O_ACCMODE;
207	rflags |= v9fs_mapped_dotl_flags(flags);
208
209	return rflags;
210}
211
212/**
213 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
214 * @dir: directory inode that is being created
215 * @dentry:  dentry that is being deleted
216 * @omode: create permissions
217 *
218 */
219
220static int
221v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
222		bool excl)
223{
224	return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
225}
226
227static int
228v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
229			  struct file *file, unsigned flags, umode_t omode)
230{
231	int err = 0;
232	kgid_t gid;
233	umode_t mode;
234	const unsigned char *name = NULL;
235	struct p9_qid qid;
236	struct inode *inode;
237	struct p9_fid *fid = NULL;
238	struct v9fs_inode *v9inode;
239	struct p9_fid *dfid, *ofid, *inode_fid;
240	struct v9fs_session_info *v9ses;
241	struct posix_acl *pacl = NULL, *dacl = NULL;
242	struct dentry *res = NULL;
243
244	if (d_in_lookup(dentry)) {
245		res = v9fs_vfs_lookup(dir, dentry, 0);
246		if (IS_ERR(res))
247			return PTR_ERR(res);
248
249		if (res)
250			dentry = res;
251	}
252
253	/* Only creates */
254	if (!(flags & O_CREAT) || d_really_is_positive(dentry))
255		return	finish_no_open(file, res);
256
257	v9ses = v9fs_inode2v9ses(dir);
258
259	name = dentry->d_name.name;
260	p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
261		 name, flags, omode);
262
263	dfid = v9fs_parent_fid(dentry);
264	if (IS_ERR(dfid)) {
265		err = PTR_ERR(dfid);
266		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
267		goto out;
268	}
269
270	/* clone a fid to use for creation */
271	ofid = clone_fid(dfid);
272	if (IS_ERR(ofid)) {
273		err = PTR_ERR(ofid);
274		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
275		goto out;
276	}
277
278	gid = v9fs_get_fsgid_for_create(dir);
279
280	mode = omode;
281	/* Update mode based on ACL value */
282	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
283	if (err) {
284		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
285			 err);
286		goto error;
287	}
288	err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
289				    mode, gid, &qid);
290	if (err < 0) {
291		p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
292			 err);
293		goto error;
294	}
295	v9fs_invalidate_inode_attr(dir);
296
297	/* instantiate inode and assign the unopened fid to the dentry */
298	fid = p9_client_walk(dfid, 1, &name, 1);
299	if (IS_ERR(fid)) {
300		err = PTR_ERR(fid);
301		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
302		fid = NULL;
303		goto error;
304	}
305	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
306	if (IS_ERR(inode)) {
307		err = PTR_ERR(inode);
308		p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
309		goto error;
310	}
311	/* Now set the ACL based on the default value */
312	v9fs_set_create_acl(inode, fid, dacl, pacl);
313
314	v9fs_fid_add(dentry, fid);
315	d_instantiate(dentry, inode);
316
317	v9inode = V9FS_I(inode);
318	mutex_lock(&v9inode->v_mutex);
319	if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
320	    !v9inode->writeback_fid &&
321	    ((flags & O_ACCMODE) != O_RDONLY)) {
322		/*
323		 * clone a fid and add it to writeback_fid
324		 * we do it during open time instead of
325		 * page dirty time via write_begin/page_mkwrite
326		 * because we want write after unlink usecase
327		 * to work.
328		 */
329		inode_fid = v9fs_writeback_fid(dentry);
330		if (IS_ERR(inode_fid)) {
331			err = PTR_ERR(inode_fid);
332			mutex_unlock(&v9inode->v_mutex);
333			goto err_clunk_old_fid;
334		}
335		v9inode->writeback_fid = (void *) inode_fid;
336	}
337	mutex_unlock(&v9inode->v_mutex);
338	/* Since we are opening a file, assign the open fid to the file */
339	err = finish_open(file, dentry, generic_file_open);
340	if (err)
341		goto err_clunk_old_fid;
342	file->private_data = ofid;
343	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
344		v9fs_cache_inode_set_cookie(inode, file);
345	file->f_mode |= FMODE_CREATED;
346out:
347	v9fs_put_acl(dacl, pacl);
348	dput(res);
349	return err;
350
351error:
352	if (fid)
353		p9_client_clunk(fid);
354err_clunk_old_fid:
355	if (ofid)
356		p9_client_clunk(ofid);
357	goto out;
358}
359
360/**
361 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
362 * @dir:  inode that is being unlinked
363 * @dentry: dentry that is being unlinked
364 * @omode: mode for new directory
365 *
366 */
367
368static int v9fs_vfs_mkdir_dotl(struct inode *dir,
369			       struct dentry *dentry, 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		dfid = NULL;
394		goto error;
395	}
396
397	gid = v9fs_get_fsgid_for_create(dir);
398	mode = omode;
399	/* Update mode based on ACL value */
400	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
401	if (err) {
402		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
403			 err);
404		goto error;
405	}
406	name = dentry->d_name.name;
407	err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
408	if (err < 0)
409		goto error;
410
411	fid = p9_client_walk(dfid, 1, &name, 1);
412	if (IS_ERR(fid)) {
413		err = PTR_ERR(fid);
414		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
415			 err);
416		fid = NULL;
417		goto error;
418	}
419
420	/* instantiate inode and assign the unopened fid to the dentry */
421	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
422		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
423		if (IS_ERR(inode)) {
424			err = PTR_ERR(inode);
425			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
426				 err);
427			goto error;
428		}
429		v9fs_fid_add(dentry, fid);
430		v9fs_set_create_acl(inode, fid, dacl, pacl);
431		d_instantiate(dentry, inode);
432		fid = NULL;
433		err = 0;
434	} else {
435		/*
436		 * Not in cached mode. No need to populate
437		 * inode with stat. We need to get an inode
438		 * so that we can set the acl with dentry
439		 */
440		inode = v9fs_get_inode(dir->i_sb, mode, 0);
441		if (IS_ERR(inode)) {
442			err = PTR_ERR(inode);
443			goto error;
444		}
445		v9fs_set_create_acl(inode, fid, dacl, pacl);
446		d_instantiate(dentry, inode);
447	}
448	inc_nlink(dir);
449	v9fs_invalidate_inode_attr(dir);
450error:
451	if (fid)
452		p9_client_clunk(fid);
453	v9fs_put_acl(dacl, pacl);
454	return err;
455}
456
457static int
458v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
459		 u32 request_mask, unsigned int flags)
460{
461	struct dentry *dentry = path->dentry;
462	struct v9fs_session_info *v9ses;
463	struct p9_fid *fid;
464	struct p9_stat_dotl *st;
465
466	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
467	v9ses = v9fs_dentry2v9ses(dentry);
468	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
469		generic_fillattr(d_inode(dentry), stat);
470		return 0;
471	}
472	fid = v9fs_fid_lookup(dentry);
473	if (IS_ERR(fid))
474		return PTR_ERR(fid);
475
476	/* Ask for all the fields in stat structure. Server will return
477	 * whatever it supports
478	 */
479
480	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
481	if (IS_ERR(st))
482		return PTR_ERR(st);
483
484	v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
485	generic_fillattr(d_inode(dentry), stat);
486	/* Change block size to what the server returned */
487	stat->blksize = st->st_blksize;
488
489	kfree(st);
490	return 0;
491}
492
493/*
494 * Attribute flags.
495 */
496#define P9_ATTR_MODE		(1 << 0)
497#define P9_ATTR_UID		(1 << 1)
498#define P9_ATTR_GID		(1 << 2)
499#define P9_ATTR_SIZE		(1 << 3)
500#define P9_ATTR_ATIME		(1 << 4)
501#define P9_ATTR_MTIME		(1 << 5)
502#define P9_ATTR_CTIME		(1 << 6)
503#define P9_ATTR_ATIME_SET	(1 << 7)
504#define P9_ATTR_MTIME_SET	(1 << 8)
505
506struct dotl_iattr_map {
507	int iattr_valid;
508	int p9_iattr_valid;
509};
510
511static int v9fs_mapped_iattr_valid(int iattr_valid)
512{
513	int i;
514	int p9_iattr_valid = 0;
515	struct dotl_iattr_map dotl_iattr_map[] = {
516		{ ATTR_MODE,		P9_ATTR_MODE },
517		{ ATTR_UID,		P9_ATTR_UID },
518		{ ATTR_GID,		P9_ATTR_GID },
519		{ ATTR_SIZE,		P9_ATTR_SIZE },
520		{ ATTR_ATIME,		P9_ATTR_ATIME },
521		{ ATTR_MTIME,		P9_ATTR_MTIME },
522		{ ATTR_CTIME,		P9_ATTR_CTIME },
523		{ ATTR_ATIME_SET,	P9_ATTR_ATIME_SET },
524		{ ATTR_MTIME_SET,	P9_ATTR_MTIME_SET },
525	};
526	for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
527		if (iattr_valid & dotl_iattr_map[i].iattr_valid)
528			p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
529	}
530	return p9_iattr_valid;
531}
532
533/**
534 * v9fs_vfs_setattr_dotl - set file metadata
535 * @dentry: file whose metadata to set
536 * @iattr: metadata assignment structure
537 *
538 */
539
540int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
541{
542	int retval;
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(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	if (IS_ERR(fid))
581		return PTR_ERR(fid);
582
583	/* Write all dirty data */
584	if (S_ISREG(inode->i_mode))
585		filemap_write_and_wait(inode->i_mapping);
586
587	retval = p9_client_setattr(fid, &p9attr);
588	if (retval < 0)
589		return retval;
590
591	if ((iattr->ia_valid & ATTR_SIZE) &&
592	    iattr->ia_size != i_size_read(inode))
593		truncate_setsize(inode, iattr->ia_size);
594
595	v9fs_invalidate_inode_attr(inode);
596	setattr_copy(inode, iattr);
597	mark_inode_dirty(inode);
598	if (iattr->ia_valid & ATTR_MODE) {
599		/* We also want to update ACL when we update mode bits */
600		retval = v9fs_acl_chmod(inode, fid);
601		if (retval < 0)
602			return retval;
603	}
604	return 0;
605}
606
607/**
608 * v9fs_stat2inode_dotl - populate an inode structure with stat info
609 * @stat: stat structure
610 * @inode: inode to populate
611 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
612 *
613 */
614
615void
616v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
617		      unsigned int flags)
618{
619	umode_t mode;
620	struct v9fs_inode *v9inode = V9FS_I(inode);
621
622	if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
623		inode->i_atime.tv_sec = stat->st_atime_sec;
624		inode->i_atime.tv_nsec = stat->st_atime_nsec;
625		inode->i_mtime.tv_sec = stat->st_mtime_sec;
626		inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
627		inode->i_ctime.tv_sec = stat->st_ctime_sec;
628		inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
629		inode->i_uid = stat->st_uid;
630		inode->i_gid = stat->st_gid;
631		set_nlink(inode, stat->st_nlink);
632
633		mode = stat->st_mode & S_IALLUGO;
634		mode |= inode->i_mode & ~S_IALLUGO;
635		inode->i_mode = mode;
636
637		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
638			v9fs_i_size_write(inode, stat->st_size);
639		inode->i_blocks = stat->st_blocks;
640	} else {
641		if (stat->st_result_mask & P9_STATS_ATIME) {
642			inode->i_atime.tv_sec = stat->st_atime_sec;
643			inode->i_atime.tv_nsec = stat->st_atime_nsec;
644		}
645		if (stat->st_result_mask & P9_STATS_MTIME) {
646			inode->i_mtime.tv_sec = stat->st_mtime_sec;
647			inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
648		}
649		if (stat->st_result_mask & P9_STATS_CTIME) {
650			inode->i_ctime.tv_sec = stat->st_ctime_sec;
651			inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
652		}
653		if (stat->st_result_mask & P9_STATS_UID)
654			inode->i_uid = stat->st_uid;
655		if (stat->st_result_mask & P9_STATS_GID)
656			inode->i_gid = stat->st_gid;
657		if (stat->st_result_mask & P9_STATS_NLINK)
658			set_nlink(inode, stat->st_nlink);
659		if (stat->st_result_mask & P9_STATS_MODE) {
660			mode = stat->st_mode & S_IALLUGO;
661			mode |= inode->i_mode & ~S_IALLUGO;
662			inode->i_mode = mode;
663		}
664		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
665		    stat->st_result_mask & P9_STATS_SIZE)
666			v9fs_i_size_write(inode, stat->st_size);
667		if (stat->st_result_mask & P9_STATS_BLOCKS)
668			inode->i_blocks = stat->st_blocks;
669	}
670	if (stat->st_result_mask & P9_STATS_GEN)
671		inode->i_generation = stat->st_gen;
672
673	/* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
674	 * because the inode structure does not have fields for them.
675	 */
676	v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
677}
678
679static int
680v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
681		const char *symname)
682{
683	int err;
684	kgid_t gid;
685	const unsigned char *name;
686	struct p9_qid qid;
687	struct inode *inode;
688	struct p9_fid *dfid;
689	struct p9_fid *fid = NULL;
690	struct v9fs_session_info *v9ses;
691
692	name = dentry->d_name.name;
693	p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
694	v9ses = v9fs_inode2v9ses(dir);
695
696	dfid = v9fs_parent_fid(dentry);
697	if (IS_ERR(dfid)) {
698		err = PTR_ERR(dfid);
699		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
700		return err;
701	}
702
703	gid = v9fs_get_fsgid_for_create(dir);
704
705	/* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
706	err = p9_client_symlink(dfid, name, symname, gid, &qid);
707
708	if (err < 0) {
709		p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
710		goto error;
711	}
712
713	v9fs_invalidate_inode_attr(dir);
714	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
715		/* Now walk from the parent so we can get an unopened fid. */
716		fid = p9_client_walk(dfid, 1, &name, 1);
717		if (IS_ERR(fid)) {
718			err = PTR_ERR(fid);
719			p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
720				 err);
721			fid = NULL;
722			goto error;
723		}
724
725		/* instantiate inode and assign the unopened fid to dentry */
726		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
727		if (IS_ERR(inode)) {
728			err = PTR_ERR(inode);
729			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
730				 err);
731			goto error;
732		}
733		v9fs_fid_add(dentry, fid);
734		d_instantiate(dentry, inode);
735		fid = NULL;
736		err = 0;
737	} else {
738		/* Not in cached mode. No need to populate inode with stat */
739		inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
740		if (IS_ERR(inode)) {
741			err = PTR_ERR(inode);
742			goto error;
743		}
744		d_instantiate(dentry, inode);
745	}
746
747error:
748	if (fid)
749		p9_client_clunk(fid);
750
751	return err;
752}
753
754/**
755 * v9fs_vfs_link_dotl - create a hardlink for dotl
756 * @old_dentry: dentry for file to link to
757 * @dir: inode destination for new link
758 * @dentry: dentry for link
759 *
760 */
761
762static int
763v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
764		struct dentry *dentry)
765{
766	int err;
767	struct p9_fid *dfid, *oldfid;
768	struct v9fs_session_info *v9ses;
769
770	p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
771		 dir->i_ino, old_dentry, dentry);
772
773	v9ses = v9fs_inode2v9ses(dir);
774	dfid = v9fs_parent_fid(dentry);
775	if (IS_ERR(dfid))
776		return PTR_ERR(dfid);
777
778	oldfid = v9fs_fid_lookup(old_dentry);
779	if (IS_ERR(oldfid))
780		return PTR_ERR(oldfid);
781
782	err = p9_client_link(dfid, oldfid, dentry->d_name.name);
783
784	if (err < 0) {
785		p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
786		return err;
787	}
788
789	v9fs_invalidate_inode_attr(dir);
790	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
791		/* Get the latest stat info from server. */
792		struct p9_fid *fid;
793		fid = v9fs_fid_lookup(old_dentry);
794		if (IS_ERR(fid))
795			return PTR_ERR(fid);
796
797		v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
798	}
799	ihold(d_inode(old_dentry));
800	d_instantiate(dentry, d_inode(old_dentry));
801
802	return err;
803}
804
805/**
806 * v9fs_vfs_mknod_dotl - create a special file
807 * @dir: inode destination for new link
808 * @dentry: dentry for file
809 * @omode: mode for creation
810 * @rdev: device associated with special file
811 *
812 */
813static int
814v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
815		dev_t rdev)
816{
817	int err;
818	kgid_t gid;
819	const unsigned char *name;
820	umode_t mode;
821	struct v9fs_session_info *v9ses;
822	struct p9_fid *fid = NULL, *dfid = NULL;
823	struct inode *inode;
824	struct p9_qid qid;
825	struct posix_acl *dacl = NULL, *pacl = NULL;
826
827	p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
828		 dir->i_ino, dentry, omode,
829		 MAJOR(rdev), MINOR(rdev));
830
831	v9ses = v9fs_inode2v9ses(dir);
832	dfid = v9fs_parent_fid(dentry);
833	if (IS_ERR(dfid)) {
834		err = PTR_ERR(dfid);
835		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
836		dfid = NULL;
837		goto error;
838	}
839
840	gid = v9fs_get_fsgid_for_create(dir);
841	mode = omode;
842	/* Update mode based on ACL value */
843	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
844	if (err) {
845		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
846			 err);
847		goto error;
848	}
849	name = dentry->d_name.name;
850
851	err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
852	if (err < 0)
853		goto error;
854
855	v9fs_invalidate_inode_attr(dir);
856	fid = p9_client_walk(dfid, 1, &name, 1);
857	if (IS_ERR(fid)) {
858		err = PTR_ERR(fid);
859		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
860			 err);
861		fid = NULL;
862		goto error;
863	}
864
865	/* instantiate inode and assign the unopened fid to the dentry */
866	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
867		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
868		if (IS_ERR(inode)) {
869			err = PTR_ERR(inode);
870			p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
871				 err);
872			goto error;
873		}
874		v9fs_set_create_acl(inode, fid, dacl, pacl);
875		v9fs_fid_add(dentry, fid);
876		d_instantiate(dentry, inode);
877		fid = NULL;
878		err = 0;
879	} else {
880		/*
881		 * Not in cached mode. No need to populate inode with stat.
882		 * socket syscall returns a fd, so we need instantiate
883		 */
884		inode = v9fs_get_inode(dir->i_sb, mode, rdev);
885		if (IS_ERR(inode)) {
886			err = PTR_ERR(inode);
887			goto error;
888		}
889		v9fs_set_create_acl(inode, fid, dacl, pacl);
890		d_instantiate(dentry, inode);
891	}
892error:
893	if (fid)
894		p9_client_clunk(fid);
895	v9fs_put_acl(dacl, pacl);
896	return err;
897}
898
899/**
900 * v9fs_vfs_get_link_dotl - follow a symlink path
901 * @dentry: dentry for symlink
902 * @inode: inode for symlink
903 * @done: destructor for return value
904 */
905
906static const char *
907v9fs_vfs_get_link_dotl(struct dentry *dentry,
908		       struct inode *inode,
909		       struct delayed_call *done)
910{
911	struct p9_fid *fid;
912	char *target;
913	int retval;
914
915	if (!dentry)
916		return ERR_PTR(-ECHILD);
917
918	p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
919
920	fid = v9fs_fid_lookup(dentry);
921	if (IS_ERR(fid))
922		return ERR_CAST(fid);
923	retval = p9_client_readlink(fid, &target);
924	if (retval)
925		return ERR_PTR(retval);
926	set_delayed_call(done, kfree_link, target);
927	return target;
928}
929
930int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
931{
932	struct p9_stat_dotl *st;
933	struct v9fs_session_info *v9ses;
934	unsigned int flags;
935
936	v9ses = v9fs_inode2v9ses(inode);
937	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
938	if (IS_ERR(st))
939		return PTR_ERR(st);
940	/*
941	 * Don't update inode if the file type is different
942	 */
943	if (inode_wrong_type(inode, st->st_mode))
944		goto out;
945
946	/*
947	 * We don't want to refresh inode->i_size,
948	 * because we may have cached data
949	 */
950	flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
951		V9FS_STAT2INODE_KEEP_ISIZE : 0;
952	v9fs_stat2inode_dotl(st, inode, flags);
953out:
954	kfree(st);
955	return 0;
956}
957
958const struct inode_operations v9fs_dir_inode_operations_dotl = {
959	.create = v9fs_vfs_create_dotl,
960	.atomic_open = v9fs_vfs_atomic_open_dotl,
961	.lookup = v9fs_vfs_lookup,
962	.link = v9fs_vfs_link_dotl,
963	.symlink = v9fs_vfs_symlink_dotl,
964	.unlink = v9fs_vfs_unlink,
965	.mkdir = v9fs_vfs_mkdir_dotl,
966	.rmdir = v9fs_vfs_rmdir,
967	.mknod = v9fs_vfs_mknod_dotl,
968	.rename = v9fs_vfs_rename,
969	.getattr = v9fs_vfs_getattr_dotl,
970	.setattr = v9fs_vfs_setattr_dotl,
971	.listxattr = v9fs_listxattr,
972	.get_acl = v9fs_iop_get_acl,
973};
974
975const struct inode_operations v9fs_file_inode_operations_dotl = {
976	.getattr = v9fs_vfs_getattr_dotl,
977	.setattr = v9fs_vfs_setattr_dotl,
978	.listxattr = v9fs_listxattr,
979	.get_acl = v9fs_iop_get_acl,
980};
981
982const struct inode_operations v9fs_symlink_inode_operations_dotl = {
983	.get_link = v9fs_vfs_get_link_dotl,
984	.getattr = v9fs_vfs_getattr_dotl,
985	.setattr = v9fs_vfs_setattr_dotl,
986	.listxattr = v9fs_listxattr,
987};
988