vfs_inode_dotl.c

  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/namei.h>
 17#include <linux/sched.h>
 18#include <linux/slab.h>
 19#include <linux/xattr.h>
 20#include <linux/posix_acl.h>
 21#include <net/9p/9p.h>
 22#include <net/9p/client.h>
 23
 24#include "v9fs.h"
 25#include "v9fs_vfs.h"
 26#include "fid.h"
 27#include "cache.h"
 28#include "xattr.h"
 29#include "acl.h"
 30
 31static int
 32v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
 33		    struct dentry *dentry, umode_t omode, dev_t rdev);
 34
 35/**
 36 * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object
 37 * @dir_inode: The directory inode
 38 *
 39 * Helper function to get the gid for creating a
 40 * new file system object. This checks the S_ISGID to determine the owning
 41 * group of the new file system object.
 42 */
 43
 44static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
 45{
 46	BUG_ON(dir_inode == NULL);
 47
 48	if (dir_inode->i_mode & S_ISGID) {
 49		/* set_gid bit is set.*/
 50		return dir_inode->i_gid;
 51	}
 52	return current_fsgid();
 53}
 54
 55static int v9fs_test_inode_dotl(struct inode *inode, void *data)
 56{
 57	struct v9fs_inode *v9inode = V9FS_I(inode);
 58	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 59
 60	/* don't match inode of different type */
 61	if (inode_wrong_type(inode, st->st_mode))
 62		return 0;
 63
 64	if (inode->i_generation != st->st_gen)
 65		return 0;
 66
 67	/* compare qid details */
 68	if (memcmp(&v9inode->qid.version,
 69		   &st->qid.version, sizeof(v9inode->qid.version)))
 70		return 0;
 71
 72	if (v9inode->qid.type != st->qid.type)
 73		return 0;
 74
 75	if (v9inode->qid.path != st->qid.path)
 76		return 0;
 77	return 1;
 78}
 79
 80/* Always get a new inode */
 81static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
 82{
 83	return 0;
 84}
 85
 86static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
 87{
 88	struct v9fs_inode *v9inode = V9FS_I(inode);
 89	struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 90
 91	memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
 92	inode->i_generation = st->st_gen;
 93	return 0;
 94}
 95
 96static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
 97					struct p9_qid *qid,
 98					struct p9_fid *fid,
 99					struct p9_stat_dotl *st,
100					int new)
101{
102	int retval;
103	struct inode *inode;
104	struct v9fs_session_info *v9ses = sb->s_fs_info;
105	int (*test)(struct inode *inode, void *data);
106
107	if (new)
108		test = v9fs_test_new_inode_dotl;
109	else
110		test = v9fs_test_inode_dotl;
111
112	inode = iget5_locked(sb, QID2INO(qid), test, v9fs_set_inode_dotl, st);
113	if (!inode)
114		return ERR_PTR(-ENOMEM);
115	if (!(inode_state_read_once(inode) & I_NEW))
116		return inode;
117	/*
118	 * initialize the inode with the stat info
119	 * FIXME!! we may need support for stale inodes
120	 * later.
121	 */
122	inode->i_ino = QID2INO(qid);
123	retval = v9fs_init_inode(v9ses, inode,
124				 st->st_mode, new_decode_dev(st->st_rdev));
125	if (retval)
126		goto error;
127
128	v9fs_stat2inode_dotl(st, inode, 0);
129	v9fs_set_netfs_context(inode);
130	v9fs_cache_inode_get_cookie(inode);
131	retval = v9fs_get_acl(inode, fid);
132	if (retval)
133		goto error;
134
135	unlock_new_inode(inode);
136	return inode;
137error:
138	iget_failed(inode);
139	return ERR_PTR(retval);
140
141}
142
143struct inode *
144v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
145			 struct super_block *sb, int new)
146{
147	struct p9_stat_dotl *st;
148	struct inode *inode = NULL;
149
150	st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
151	if (IS_ERR(st))
152		return ERR_CAST(st);
153
154	inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
155	kfree(st);
156	return inode;
157}
158
159struct dotl_openflag_map {
160	int open_flag;
161	int dotl_flag;
162};
163
164static int v9fs_mapped_dotl_flags(int flags)
165{
166	int i;
167	int rflags = 0;
168	struct dotl_openflag_map dotl_oflag_map[] = {
169		{ O_CREAT,	P9_DOTL_CREATE },
170		{ O_EXCL,	P9_DOTL_EXCL },
171		{ O_NOCTTY,	P9_DOTL_NOCTTY },
172		{ O_APPEND,	P9_DOTL_APPEND },
173		{ O_NONBLOCK,	P9_DOTL_NONBLOCK },
174		{ O_DSYNC,	P9_DOTL_DSYNC },
175		{ FASYNC,	P9_DOTL_FASYNC },
176		{ O_DIRECT,	P9_DOTL_DIRECT },
177		{ O_LARGEFILE,	P9_DOTL_LARGEFILE },
178		{ O_DIRECTORY,	P9_DOTL_DIRECTORY },
179		{ O_NOFOLLOW,	P9_DOTL_NOFOLLOW },
180		{ O_NOATIME,	P9_DOTL_NOATIME },
181		{ O_CLOEXEC,	P9_DOTL_CLOEXEC },
182		{ O_SYNC,	P9_DOTL_SYNC},
183	};
184	for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
185		if (flags & dotl_oflag_map[i].open_flag)
186			rflags |= dotl_oflag_map[i].dotl_flag;
187	}
188	return rflags;
189}
190
191/**
192 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
193 * plan 9 open flag.
194 * @flags: flags to convert
195 */
196int v9fs_open_to_dotl_flags(int flags)
197{
198	int rflags = 0;
199
200	/*
201	 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
202	 * and P9_DOTL_NOACCESS
203	 */
204	rflags |= flags & O_ACCMODE;
205	rflags |= v9fs_mapped_dotl_flags(flags);
206
207	return rflags;
208}
209
210/**
211 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
212 * @idmap: The user namespace of the mount
213 * @dir: directory inode that is being created
214 * @dentry:  dentry that is being deleted
215 * @omode: create permissions
216 * @excl: True if the file must not yet exist
217 *
218 */
219static int
220v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir,
221		     struct dentry *dentry, umode_t omode, bool excl)
222{
223	return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0);
224}
225
226static int
227v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
228			  struct file *file, unsigned int flags, umode_t omode)
229{
230	int err = 0;
231	kgid_t gid;
232	umode_t mode;
233	int p9_omode = v9fs_open_to_dotl_flags(flags);
234	const unsigned char *name = NULL;
235	struct p9_qid qid;
236	struct inode *inode;
237	struct p9_fid *fid = NULL;
238	struct p9_fid *dfid = NULL, *ofid = NULL;
239	struct v9fs_session_info *v9ses;
240	struct posix_acl *pacl = NULL, *dacl = NULL;
241
242	if (d_in_lookup(dentry)) {
243		struct dentry *res = v9fs_vfs_lookup(dir, dentry, 0);
244		if (res || d_really_is_positive(dentry))
245			return	finish_no_open(file, res);
246	}
247
248	/* Only creates */
249	if (!(flags & O_CREAT))
250		return	finish_no_open(file, NULL);
251
252	v9ses = v9fs_inode2v9ses(dir);
253
254	name = dentry->d_name.name;
255	p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
256		 name, flags, omode);
257
258	dfid = v9fs_parent_fid(dentry);
259	if (IS_ERR(dfid)) {
260		err = PTR_ERR(dfid);
261		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
262		goto out;
263	}
264
265	/* clone a fid to use for creation */
266	ofid = clone_fid(dfid);
267	if (IS_ERR(ofid)) {
268		err = PTR_ERR(ofid);
269		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
270		goto out;
271	}
272
273	gid = v9fs_get_fsgid_for_create(dir);
274
275	mode = omode;
276	/* Update mode based on ACL value */
277	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
278	if (err) {
279		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n",
280			 err);
281		goto out;
282	}
283
284	if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
285		p9_omode = (p9_omode & ~(P9_OWRITE | P9_DOTL_APPEND)) | P9_ORDWR;
286		p9_debug(P9_DEBUG_CACHE,
287			"write-only file with writeback enabled, creating w/ O_RDWR\n");
288	}
289	err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid);
290	if (err < 0) {
291		p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n",
292			 err);
293		goto out;
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		goto out;
303	}
304	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
305	if (IS_ERR(inode)) {
306		err = PTR_ERR(inode);
307		p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
308		goto out;
309	}
310	/* Now set the ACL based on the default value */
311	v9fs_set_create_acl(inode, fid, dacl, pacl);
312
313	v9fs_fid_add(dentry, &fid);
314	d_instantiate(dentry, inode);
315
316	/* Since we are opening a file, assign the open fid to the file */
317	err = finish_open(file, dentry, generic_file_open);
318	if (err)
319		goto out;
320	file->private_data = ofid;
321#ifdef CONFIG_9P_FSCACHE
322	if (v9ses->cache & CACHE_FSCACHE) {
323		struct v9fs_inode *v9inode = V9FS_I(inode);
324		fscache_use_cookie(v9fs_inode_cookie(v9inode),
325				   file->f_mode & FMODE_WRITE);
326	}
327#endif
328	v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags);
329	v9fs_open_fid_add(inode, &ofid);
330	file->f_mode |= FMODE_CREATED;
331out:
332	p9_fid_put(dfid);
333	p9_fid_put(ofid);
334	p9_fid_put(fid);
335	v9fs_put_acl(dacl, pacl);
336	return err;
337}
338
339/**
340 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
341 * @idmap: The idmap of the mount
342 * @dir:  inode that is being unlinked
343 * @dentry: dentry that is being unlinked
344 * @omode: mode for new directory
345 *
346 */
347
348static struct dentry *v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
349					  struct inode *dir, struct dentry *dentry,
350					  umode_t omode)
351{
352	int err;
353	struct v9fs_session_info *v9ses;
354	struct p9_fid *fid = NULL, *dfid = NULL;
355	kgid_t gid;
356	const unsigned char *name;
357	umode_t mode;
358	struct inode *inode;
359	struct p9_qid qid;
360	struct posix_acl *dacl = NULL, *pacl = NULL;
361
362	p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
363	v9ses = v9fs_inode2v9ses(dir);
364
365	omode |= S_IFDIR;
366	if (dir->i_mode & S_ISGID)
367		omode |= S_ISGID;
368
369	dfid = v9fs_parent_fid(dentry);
370	if (IS_ERR(dfid)) {
371		err = PTR_ERR(dfid);
372		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
373		goto error;
374	}
375
376	gid = v9fs_get_fsgid_for_create(dir);
377	mode = omode;
378	/* Update mode based on ACL value */
379	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
380	if (err) {
381		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
382			 err);
383		goto error;
384	}
385	name = dentry->d_name.name;
386	err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
387	if (err < 0)
388		goto error;
389	fid = p9_client_walk(dfid, 1, &name, 1);
390	if (IS_ERR(fid)) {
391		err = PTR_ERR(fid);
392		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
393			 err);
394		goto error;
395	}
396
397	/* instantiate inode and assign the unopened fid to the dentry */
398	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
399	if (IS_ERR(inode)) {
400		err = PTR_ERR(inode);
401		p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
402			 err);
403		goto error;
404	}
405	v9fs_set_create_acl(inode, fid, dacl, pacl);
406	v9fs_fid_add(dentry, &fid);
407	d_instantiate(dentry, inode);
408	err = 0;
409	inc_nlink(dir);
410	v9fs_invalidate_inode_attr(dir);
411error:
412	p9_fid_put(fid);
413	v9fs_put_acl(dacl, pacl);
414	p9_fid_put(dfid);
415	return ERR_PTR(err);
416}
417
418static int
419v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap,
420		      const struct path *path, struct kstat *stat,
421		      u32 request_mask, unsigned int flags)
422{
423	struct dentry *dentry = path->dentry;
424	struct v9fs_session_info *v9ses;
425	struct p9_fid *fid;
426	struct inode *inode = d_inode(dentry);
427	struct p9_stat_dotl *st;
428
429	p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
430	v9ses = v9fs_dentry2v9ses(dentry);
431	if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
432		generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
433		return 0;
434	} else if (v9ses->cache) {
435		if (S_ISREG(inode->i_mode)) {
436			int retval = filemap_fdatawrite(inode->i_mapping);
437
438			if (retval)
439				p9_debug(P9_DEBUG_ERROR,
440				    "flushing writeback during getattr returned %d\n", retval);
441		}
442	}
443	fid = v9fs_fid_lookup(dentry);
444	if (IS_ERR(fid))
445		return PTR_ERR(fid);
446
447	/* Ask for all the fields in stat structure. Server will return
448	 * whatever it supports
449	 */
450
451	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
452	p9_fid_put(fid);
453	if (IS_ERR(st))
454		return PTR_ERR(st);
455
456	v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
457	generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
458	/* Change block size to what the server returned */
459	stat->blksize = st->st_blksize;
460
461	kfree(st);
462	return 0;
463}
464
465/*
466 * Attribute flags.
467 */
468#define P9_ATTR_MODE		(1 << 0)
469#define P9_ATTR_UID		(1 << 1)
470#define P9_ATTR_GID		(1 << 2)
471#define P9_ATTR_SIZE		(1 << 3)
472#define P9_ATTR_ATIME		(1 << 4)
473#define P9_ATTR_MTIME		(1 << 5)
474#define P9_ATTR_CTIME		(1 << 6)
475#define P9_ATTR_ATIME_SET	(1 << 7)
476#define P9_ATTR_MTIME_SET	(1 << 8)
477
478struct dotl_iattr_map {
479	int iattr_valid;
480	int p9_iattr_valid;
481};
482
483static int v9fs_mapped_iattr_valid(int iattr_valid)
484{
485	int i;
486	int p9_iattr_valid = 0;
487	struct dotl_iattr_map dotl_iattr_map[] = {
488		{ ATTR_MODE,		P9_ATTR_MODE },
489		{ ATTR_UID,		P9_ATTR_UID },
490		{ ATTR_GID,		P9_ATTR_GID },
491		{ ATTR_SIZE,		P9_ATTR_SIZE },
492		{ ATTR_ATIME,		P9_ATTR_ATIME },
493		{ ATTR_MTIME,		P9_ATTR_MTIME },
494		{ ATTR_CTIME,		P9_ATTR_CTIME },
495		{ ATTR_ATIME_SET,	P9_ATTR_ATIME_SET },
496		{ ATTR_MTIME_SET,	P9_ATTR_MTIME_SET },
497	};
498	for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
499		if (iattr_valid & dotl_iattr_map[i].iattr_valid)
500			p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
501	}
502	return p9_iattr_valid;
503}
504
505/**
506 * v9fs_vfs_setattr_dotl - set file metadata
507 * @idmap: idmap of the mount
508 * @dentry: file whose metadata to set
509 * @iattr: metadata assignment structure
510 *
511 */
512
513int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
514			  struct dentry *dentry, struct iattr *iattr)
515{
516	int retval, use_dentry = 0;
517	struct inode *inode = d_inode(dentry);
518	struct v9fs_session_info __maybe_unused *v9ses;
519	struct p9_fid *fid = NULL;
520	struct p9_iattr_dotl p9attr = {
521		.uid = INVALID_UID,
522		.gid = INVALID_GID,
523	};
524
525	p9_debug(P9_DEBUG_VFS, "\n");
526
527	retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
528	if (retval)
529		return retval;
530
531	v9ses = v9fs_dentry2v9ses(dentry);
532
533	p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
534	if (iattr->ia_valid & ATTR_MODE)
535		p9attr.mode = iattr->ia_mode;
536	if (iattr->ia_valid & ATTR_UID)
537		p9attr.uid = iattr->ia_uid;
538	if (iattr->ia_valid & ATTR_GID)
539		p9attr.gid = iattr->ia_gid;
540	if (iattr->ia_valid & ATTR_SIZE)
541		p9attr.size = iattr->ia_size;
542	if (iattr->ia_valid & ATTR_ATIME_SET) {
543		p9attr.atime_sec = iattr->ia_atime.tv_sec;
544		p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
545	}
546	if (iattr->ia_valid & ATTR_MTIME_SET) {
547		p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
548		p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
549	}
550
551	if (iattr->ia_valid & ATTR_FILE) {
552		fid = iattr->ia_file->private_data;
553		WARN_ON(!fid);
554	}
555	if (!fid) {
556		fid = v9fs_fid_lookup(dentry);
557		use_dentry = 1;
558	}
559	if (IS_ERR(fid))
560		return PTR_ERR(fid);
561
562	/* Write all dirty data */
563	if (S_ISREG(inode->i_mode)) {
564		retval = filemap_fdatawrite(inode->i_mapping);
565		if (retval < 0)
566			p9_debug(P9_DEBUG_ERROR,
567			    "Flushing file prior to setattr failed: %d\n", retval);
568	}
569
570	retval = p9_client_setattr(fid, &p9attr);
571	if (retval < 0) {
572		if (use_dentry)
573			p9_fid_put(fid);
574		return retval;
575	}
576
577	if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size !=
578		 i_size_read(inode)) {
579		truncate_setsize(inode, iattr->ia_size);
580		netfs_resize_file(netfs_inode(inode), iattr->ia_size, true);
581
582#ifdef CONFIG_9P_FSCACHE
583		if (v9ses->cache & CACHE_FSCACHE)
584			fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)),
585				iattr->ia_size);
586#endif
587	}
588
589	v9fs_invalidate_inode_attr(inode);
590	setattr_copy(&nop_mnt_idmap, inode, iattr);
591	mark_inode_dirty(inode);
592	if (iattr->ia_valid & ATTR_MODE) {
593		/* We also want to update ACL when we update mode bits */
594		retval = v9fs_acl_chmod(inode, fid);
595		if (retval < 0) {
596			if (use_dentry)
597				p9_fid_put(fid);
598			return retval;
599		}
600	}
601	if (use_dentry)
602		p9_fid_put(fid);
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_set_atime(inode, stat->st_atime_sec,
624				stat->st_atime_nsec);
625		inode_set_mtime(inode, stat->st_mtime_sec,
626				stat->st_mtime_nsec);
627		inode_set_ctime(inode, stat->st_ctime_sec,
628				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		v9inode->netfs.remote_i_size = stat->st_size;
638		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
639			v9fs_i_size_write(inode, stat->st_size);
640		inode->i_blocks = stat->st_blocks;
641	} else {
642		if (stat->st_result_mask & P9_STATS_ATIME) {
643			inode_set_atime(inode, stat->st_atime_sec,
644					stat->st_atime_nsec);
645		}
646		if (stat->st_result_mask & P9_STATS_MTIME) {
647			inode_set_mtime(inode, stat->st_mtime_sec,
648					stat->st_mtime_nsec);
649		}
650		if (stat->st_result_mask & P9_STATS_CTIME) {
651			inode_set_ctime(inode, stat->st_ctime_sec,
652					stat->st_ctime_nsec);
653		}
654		if (stat->st_result_mask & P9_STATS_UID)
655			inode->i_uid = stat->st_uid;
656		if (stat->st_result_mask & P9_STATS_GID)
657			inode->i_gid = stat->st_gid;
658		if (stat->st_result_mask & P9_STATS_NLINK)
659			set_nlink(inode, stat->st_nlink);
660		if (stat->st_result_mask & P9_STATS_MODE) {
661			mode = stat->st_mode & S_IALLUGO;
662			mode |= inode->i_mode & ~S_IALLUGO;
663			inode->i_mode = mode;
664		}
665		if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
666		    stat->st_result_mask & P9_STATS_SIZE) {
667			v9inode->netfs.remote_i_size = stat->st_size;
668			v9fs_i_size_write(inode, stat->st_size);
669		}
670		if (stat->st_result_mask & P9_STATS_BLOCKS)
671			inode->i_blocks = stat->st_blocks;
672	}
673	if (stat->st_result_mask & P9_STATS_GEN)
674		inode->i_generation = stat->st_gen;
675
676	/* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
677	 * because the inode structure does not have fields for them.
678	 */
679	v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
680}
681
682static int
683v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir,
684		      struct dentry *dentry, const char *symname)
685{
686	int err;
687	kgid_t gid;
688	const unsigned char *name;
689	struct p9_qid qid;
690	struct p9_fid *dfid;
691	struct p9_fid *fid = NULL;
692
693	name = dentry->d_name.name;
694	p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
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
715error:
716	p9_fid_put(fid);
717	p9_fid_put(dfid);
718	return err;
719}
720
721/**
722 * v9fs_vfs_link_dotl - create a hardlink for dotl
723 * @old_dentry: dentry for file to link to
724 * @dir: inode destination for new link
725 * @dentry: dentry for link
726 *
727 */
728
729static int
730v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
731		struct dentry *dentry)
732{
733	int err;
734	struct p9_fid *dfid, *oldfid;
735	struct v9fs_session_info *v9ses;
736
737	p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
738		 dir->i_ino, old_dentry, dentry);
739
740	v9ses = v9fs_inode2v9ses(dir);
741	dfid = v9fs_parent_fid(dentry);
742	if (IS_ERR(dfid))
743		return PTR_ERR(dfid);
744
745	oldfid = v9fs_fid_lookup(old_dentry);
746	if (IS_ERR(oldfid)) {
747		p9_fid_put(dfid);
748		return PTR_ERR(oldfid);
749	}
750
751	err = p9_client_link(dfid, oldfid, dentry->d_name.name);
752
753	p9_fid_put(dfid);
754	p9_fid_put(oldfid);
755	if (err < 0) {
756		p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
757		return err;
758	}
759
760	v9fs_invalidate_inode_attr(dir);
761	if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
762		/* Get the latest stat info from server. */
763		struct p9_fid *fid;
764
765		fid = v9fs_fid_lookup(old_dentry);
766		if (IS_ERR(fid))
767			return PTR_ERR(fid);
768
769		v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
770		p9_fid_put(fid);
771	}
772	ihold(d_inode(old_dentry));
773	d_instantiate(dentry, d_inode(old_dentry));
774
775	return err;
776}
777
778/**
779 * v9fs_vfs_mknod_dotl - create a special file
780 * @idmap: The idmap of the mount
781 * @dir: inode destination for new link
782 * @dentry: dentry for file
783 * @omode: mode for creation
784 * @rdev: device associated with special file
785 *
786 */
787static int
788v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
789		    struct dentry *dentry, umode_t omode, dev_t rdev)
790{
791	int err;
792	kgid_t gid;
793	const unsigned char *name;
794	umode_t mode;
795	struct v9fs_session_info *v9ses;
796	struct p9_fid *fid = NULL, *dfid = NULL;
797	struct inode *inode;
798	struct p9_qid qid;
799	struct posix_acl *dacl = NULL, *pacl = NULL;
800
801	p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
802		 dir->i_ino, dentry, omode,
803		 MAJOR(rdev), MINOR(rdev));
804
805	v9ses = v9fs_inode2v9ses(dir);
806	dfid = v9fs_parent_fid(dentry);
807	if (IS_ERR(dfid)) {
808		err = PTR_ERR(dfid);
809		p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
810		goto error;
811	}
812
813	gid = v9fs_get_fsgid_for_create(dir);
814	mode = omode;
815	/* Update mode based on ACL value */
816	err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
817	if (err) {
818		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
819			 err);
820		goto error;
821	}
822	name = dentry->d_name.name;
823
824	err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
825	if (err < 0)
826		goto error;
827
828	v9fs_invalidate_inode_attr(dir);
829	fid = p9_client_walk(dfid, 1, &name, 1);
830	if (IS_ERR(fid)) {
831		err = PTR_ERR(fid);
832		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
833			 err);
834		goto error;
835	}
836	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
837	if (IS_ERR(inode)) {
838		err = PTR_ERR(inode);
839		p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
840			 err);
841		goto error;
842	}
843	v9fs_set_create_acl(inode, fid, dacl, pacl);
844	v9fs_fid_add(dentry, &fid);
845	d_instantiate(dentry, inode);
846	err = 0;
847error:
848	p9_fid_put(fid);
849	v9fs_put_acl(dacl, pacl);
850	p9_fid_put(dfid);
851
852	return err;
853}
854
855/**
856 * v9fs_vfs_get_link_dotl - follow a symlink path
857 * @dentry: dentry for symlink
858 * @inode: inode for symlink
859 * @done: destructor for return value
860 */
861
862static const char *
863v9fs_vfs_get_link_dotl(struct dentry *dentry,
864		       struct inode *inode,
865		       struct delayed_call *done)
866{
867	struct p9_fid *fid;
868	char *target;
869	int retval;
870
871	if (!dentry)
872		return ERR_PTR(-ECHILD);
873
874	p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
875
876	fid = v9fs_fid_lookup(dentry);
877	if (IS_ERR(fid))
878		return ERR_CAST(fid);
879	retval = p9_client_readlink(fid, &target);
880	p9_fid_put(fid);
881	if (retval)
882		return ERR_PTR(retval);
883	set_delayed_call(done, kfree_link, target);
884	return target;
885}
886
887int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
888{
889	struct p9_stat_dotl *st;
890	struct v9fs_session_info *v9ses;
891	unsigned int flags;
892
893	v9ses = v9fs_inode2v9ses(inode);
894	st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
895	if (IS_ERR(st))
896		return PTR_ERR(st);
897	/*
898	 * Don't update inode if the file type is different
899	 */
900	if (inode_wrong_type(inode, st->st_mode))
901		goto out;
902
903	/*
904	 * We don't want to refresh inode->i_size,
905	 * because we may have cached data
906	 */
907	flags = (v9ses->cache & CACHE_LOOSE) ?
908		V9FS_STAT2INODE_KEEP_ISIZE : 0;
909	v9fs_stat2inode_dotl(st, inode, flags);
910out:
911	kfree(st);
912	return 0;
913}
914
915const struct inode_operations v9fs_dir_inode_operations_dotl = {
916	.create = v9fs_vfs_create_dotl,
917	.atomic_open = v9fs_vfs_atomic_open_dotl,
918	.lookup = v9fs_vfs_lookup,
919	.link = v9fs_vfs_link_dotl,
920	.symlink = v9fs_vfs_symlink_dotl,
921	.unlink = v9fs_vfs_unlink,
922	.mkdir = v9fs_vfs_mkdir_dotl,
923	.rmdir = v9fs_vfs_rmdir,
924	.mknod = v9fs_vfs_mknod_dotl,
925	.rename = v9fs_vfs_rename,
926	.getattr = v9fs_vfs_getattr_dotl,
927	.setattr = v9fs_vfs_setattr_dotl,
928	.listxattr = v9fs_listxattr,
929	.get_inode_acl = v9fs_iop_get_inode_acl,
930	.get_acl = v9fs_iop_get_acl,
931	.set_acl = v9fs_iop_set_acl,
932};
933
934const struct inode_operations v9fs_file_inode_operations_dotl = {
935	.getattr = v9fs_vfs_getattr_dotl,
936	.setattr = v9fs_vfs_setattr_dotl,
937	.listxattr = v9fs_listxattr,
938	.get_inode_acl = v9fs_iop_get_inode_acl,
939	.get_acl = v9fs_iop_get_acl,
940	.set_acl = v9fs_iop_set_acl,
941};
942
943const struct inode_operations v9fs_symlink_inode_operations_dotl = {
944	.get_link = v9fs_vfs_get_link_dotl,
945	.getattr = v9fs_vfs_getattr_dotl,
946	.setattr = v9fs_vfs_setattr_dotl,
947	.listxattr = v9fs_listxattr,
948};