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fs/9p: fix menu presentation
[linux-block.git] / fs / 9p / vfs_inode.c
CommitLineData
2bad8471
EVH		 1/*
2 * linux/fs/9p/vfs_inode.c
3 *
73c592b9 4 * This file contains vfs inode ops for the 9P2000 protocol.
2bad8471
EVH		 5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
42e8c509
EVH		 10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
2bad8471
EVH		 12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/file.h>
30#include <linux/pagemap.h>
31#include <linux/stat.h>
32#include <linux/string.h>
2bad8471
EVH		 33#include <linux/inet.h>
34#include <linux/namei.h>
35#include <linux/idr.h>
e8edc6e0 36#include <linux/sched.h>
5a0e3ad6 37#include <linux/slab.h>
ebf46264 38#include <linux/xattr.h>
85ff872d 39#include <linux/posix_acl.h>
bd238fb4
LI		 40#include <net/9p/9p.h>
41#include <net/9p/client.h>
2bad8471 42
2bad8471 43#include "v9fs.h"
2bad8471 44#include "v9fs_vfs.h"
2bad8471 45#include "fid.h"
60e78d2c 46#include "cache.h"
ebf46264 47#include "xattr.h"
85ff872d 48#include "acl.h"
2bad8471 49
754661f1 50static const struct inode_operations v9fs_dir_inode_operations;
9b6533c9
SK		 51static const struct inode_operations v9fs_dir_inode_operations_dotu;
52static const struct inode_operations v9fs_dir_inode_operations_dotl;
754661f1 53static const struct inode_operations v9fs_file_inode_operations;
9b6533c9 54static const struct inode_operations v9fs_file_inode_operations_dotl;
754661f1 55static const struct inode_operations v9fs_symlink_inode_operations;
9b6533c9 56static const struct inode_operations v9fs_symlink_inode_operations_dotl;
2bad8471 57
f5fc6145
AK		 58static int
59v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
60 dev_t rdev);
61
2bad8471
EVH		 62/**
63 * unixmode2p9mode - convert unix mode bits to plan 9
64 * @v9ses: v9fs session information
65 * @mode: mode to convert
66 *
67 */
68
73c592b9 69static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
2bad8471
EVH		 70{
71 int res;
72 res = mode & 0777;
73 if (S_ISDIR(mode))
bd238fb4 74 res |= P9_DMDIR;
dd6102fb 75 if (v9fs_proto_dotu(v9ses)) {
2bad8471 76 if (S_ISLNK(mode))
bd238fb4 77 res |= P9_DMSYMLINK;
2bad8471
EVH		 78 if (v9ses->nodev == 0) {
79 if (S_ISSOCK(mode))
bd238fb4 80 res |= P9_DMSOCKET;
2bad8471 81 if (S_ISFIFO(mode))
bd238fb4 82 res |= P9_DMNAMEDPIPE;
2bad8471 83 if (S_ISBLK(mode))
bd238fb4 84 res |= P9_DMDEVICE;
2bad8471 85 if (S_ISCHR(mode))
bd238fb4 86 res |= P9_DMDEVICE;
2bad8471
EVH		 87 }
88
89 if ((mode & S_ISUID) == S_ISUID)
bd238fb4 90 res |= P9_DMSETUID;
2bad8471 91 if ((mode & S_ISGID) == S_ISGID)
bd238fb4 92 res |= P9_DMSETGID;
d199d652
AL		 93 if ((mode & S_ISVTX) == S_ISVTX)
94 res |= P9_DMSETVTX;
bd238fb4
LI		 95 if ((mode & P9_DMLINK))
96 res |= P9_DMLINK;
2bad8471
EVH		 97 }
98
99 return res;
100}
101
102/**
103 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
104 * @v9ses: v9fs session information
105 * @mode: mode to convert
106 *
107 */
108
73c592b9 109static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
2bad8471
EVH		 110{
111 int res;
112
113 res = mode & 0777;
114
bd238fb4 115 if ((mode & P9_DMDIR) == P9_DMDIR)
2bad8471 116 res |= S_IFDIR;
dd6102fb 117 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
2bad8471 118 res |= S_IFLNK;
dd6102fb 119 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
2bad8471
EVH		 120 && (v9ses->nodev == 0))
121 res |= S_IFSOCK;
dd6102fb 122 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
2bad8471
EVH		 123 && (v9ses->nodev == 0))
124 res |= S_IFIFO;
dd6102fb 125 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
2bad8471
EVH		 126 && (v9ses->nodev == 0))
127 res |= S_IFBLK;
128 else
129 res |= S_IFREG;
130
dd6102fb 131 if (v9fs_proto_dotu(v9ses)) {
bd238fb4 132 if ((mode & P9_DMSETUID) == P9_DMSETUID)
2bad8471
EVH		 133 res |= S_ISUID;
134
bd238fb4 135 if ((mode & P9_DMSETGID) == P9_DMSETGID)
2bad8471 136 res |= S_ISGID;
d199d652
AL		 137
138 if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
139 res |= S_ISVTX;
2bad8471
EVH		 140 }
141
142 return res;
143}
144
ee443996
EVH		 145/**
146 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
147 * @uflags: flags to convert
2e4bef41 148 * @extended: if .u extensions are active
ee443996
EVH		 149 */
150
2e4bef41 151int v9fs_uflags2omode(int uflags, int extended)
6a3124a3
LI		 152{
153 int ret;
154
155 ret = 0;
156 switch (uflags&3) {
157 default:
158 case O_RDONLY:
bd238fb4 159 ret = P9_OREAD;
6a3124a3
LI		 160 break;
161
162 case O_WRONLY:
bd238fb4 163 ret = P9_OWRITE;
6a3124a3
LI		 164 break;
165
166 case O_RDWR:
bd238fb4 167 ret = P9_ORDWR;
6a3124a3
LI		 168 break;
169 }
170
6a3124a3 171 if (uflags & O_TRUNC)
bd238fb4 172 ret |= P9_OTRUNC;
6a3124a3 173
2e4bef41
EVH		 174 if (extended) {
175 if (uflags & O_EXCL)
176 ret |= P9_OEXCL;
177
178 if (uflags & O_APPEND)
179 ret |= P9_OAPPEND;
180 }
6a3124a3
LI		 181
182 return ret;
183}
184
2bad8471 185/**
531b1094 186 * v9fs_blank_wstat - helper function to setup a 9P stat structure
531b1094 187 * @wstat: structure to initialize
2bad8471
EVH		 188 *
189 */
190
7a4439c4 191void
bd238fb4 192v9fs_blank_wstat(struct p9_wstat *wstat)
2bad8471 193{
531b1094
LI		 194 wstat->type = ~0;
195 wstat->dev = ~0;
196 wstat->qid.type = ~0;
197 wstat->qid.version = ~0;
198 *((long long *)&wstat->qid.path) = ~0;
199 wstat->mode = ~0;
200 wstat->atime = ~0;
201 wstat->mtime = ~0;
202 wstat->length = ~0;
203 wstat->name = NULL;
204 wstat->uid = NULL;
205 wstat->gid = NULL;
206 wstat->muid = NULL;
207 wstat->n_uid = ~0;
208 wstat->n_gid = ~0;
209 wstat->n_muid = ~0;
210 wstat->extension = NULL;
2bad8471
EVH		 211}
212
60e78d2c
AK		 213#ifdef CONFIG_9P_FSCACHE
214/**
215 * v9fs_alloc_inode - helper function to allocate an inode
216 * This callback is executed before setting up the inode so that we
217 * can associate a vcookie with each inode.
218 *
219 */
220
221struct inode *v9fs_alloc_inode(struct super_block *sb)
222{
223 struct v9fs_cookie *vcookie;
224 vcookie = (struct v9fs_cookie *)kmem_cache_alloc(vcookie_cache,
225 GFP_KERNEL);
226 if (!vcookie)
227 return NULL;
228
229 vcookie->fscache = NULL;
230 vcookie->qid = NULL;
231 spin_lock_init(&vcookie->lock);
232 return &vcookie->inode;
233}
234
235/**
236 * v9fs_destroy_inode - destroy an inode
237 *
238 */
239
fa0d7e3d 240static void v9fs_i_callback(struct rcu_head *head)
60e78d2c 241{
fa0d7e3d
NP		 242 struct inode *inode = container_of(head, struct inode, i_rcu);
243 INIT_LIST_HEAD(&inode->i_dentry);
60e78d2c
AK		 244 kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode));
245}
fa0d7e3d
NP		 246
247void v9fs_destroy_inode(struct inode *inode)
248{
249 call_rcu(&inode->i_rcu, v9fs_i_callback);
250}
60e78d2c
AK		 251#endif
252
09d34ee5
EVH		 253/**
254 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
255 * new file system object. This checks the S_ISGID to determine the owning
256 * group of the new file system object.
257 */
258
259static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
260{
261 BUG_ON(dir_inode == NULL);
262
263 if (dir_inode->i_mode & S_ISGID) {
264 /* set_gid bit is set.*/
265 return dir_inode->i_gid;
266 }
267 return current_fsgid();
268}
269
270/**
271 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
272 * dir inode.
273 *
274 */
275
ea137533 276static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
09d34ee5
EVH		 277{
278 struct dentry *dentry;
279
873feea0 280 spin_lock(&inode->i_lock);
09d34ee5
EVH		 281 /* Directory should have only one entry. */
282 BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
283 dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
873feea0 284 spin_unlock(&inode->i_lock);
09d34ee5
EVH		 285 return dentry;
286}
287
2bad8471
EVH		 288/**
289 * v9fs_get_inode - helper function to setup an inode
290 * @sb: superblock
291 * @mode: mode to setup inode with
292 *
293 */
294
295struct inode *v9fs_get_inode(struct super_block *sb, int mode)
296{
2bb54115 297 int err;
6a3124a3 298 struct inode *inode;
b501611a 299 struct v9fs_session_info *v9ses = sb->s_fs_info;
2bad8471 300
bd238fb4 301 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
2bad8471
EVH		 302
303 inode = new_inode(sb);
2bb54115
AK		 304 if (!inode) {
305 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
48559b4c 306 return ERR_PTR(-ENOMEM);
2bb54115
AK		 307 }
308
217f206d 309 inode_init_owner(inode, NULL, mode);
2bb54115
AK		 310 inode->i_blocks = 0;
311 inode->i_rdev = 0;
312 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
313 inode->i_mapping->a_ops = &v9fs_addr_operations;
314
315 switch (mode & S_IFMT) {
316 case S_IFIFO:
317 case S_IFBLK:
318 case S_IFCHR:
319 case S_IFSOCK:
4b43516a
MK		 320 if (v9fs_proto_dotl(v9ses)) {
321 inode->i_op = &v9fs_file_inode_operations_dotl;
322 inode->i_fop = &v9fs_file_operations_dotl;
323 } else if (v9fs_proto_dotu(v9ses)) {
324 inode->i_op = &v9fs_file_inode_operations;
325 inode->i_fop = &v9fs_file_operations;
326 } else {
bd238fb4 327 P9_DPRINTK(P9_DEBUG_ERROR,
2bb54115
AK		 328 "special files without extended mode\n");
329 err = -EINVAL;
330 goto error;
2bad8471 331 }
2bb54115
AK		 332 init_special_inode(inode, inode->i_mode, inode->i_rdev);
333 break;
334 case S_IFREG:
9b6533c9
SK		 335 if (v9fs_proto_dotl(v9ses)) {
336 inode->i_op = &v9fs_file_inode_operations_dotl;
337 inode->i_fop = &v9fs_file_operations_dotl;
338 } else {
339 inode->i_op = &v9fs_file_inode_operations;
340 inode->i_fop = &v9fs_file_operations;
341 }
342
2bb54115 343 break;
9b6533c9 344
2bb54115 345 case S_IFLNK:
9b6533c9
SK		 346 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
347 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
348 "legacy protocol.\n");
2bb54115
AK		 349 err = -EINVAL;
350 goto error;
351 }
9b6533c9
SK		 352
353 if (v9fs_proto_dotl(v9ses))
354 inode->i_op = &v9fs_symlink_inode_operations_dotl;
355 else
356 inode->i_op = &v9fs_symlink_inode_operations;
357
2bb54115
AK		 358 break;
359 case S_IFDIR:
360 inc_nlink(inode);
9b6533c9
SK		 361 if (v9fs_proto_dotl(v9ses))
362 inode->i_op = &v9fs_dir_inode_operations_dotl;
363 else if (v9fs_proto_dotu(v9ses))
364 inode->i_op = &v9fs_dir_inode_operations_dotu;
2bb54115
AK		 365 else
366 inode->i_op = &v9fs_dir_inode_operations;
9b6533c9
SK		 367
368 if (v9fs_proto_dotl(v9ses))
369 inode->i_fop = &v9fs_dir_operations_dotl;
370 else
371 inode->i_fop = &v9fs_dir_operations;
372
2bb54115
AK		 373 break;
374 default:
375 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
376 mode, mode & S_IFMT);
377 err = -EINVAL;
378 goto error;
2bad8471 379 }
2bb54115 380
2bad8471 381 return inode;
2bb54115
AK		 382
383error:
384 iput(inode);
385 return ERR_PTR(err);
2bad8471
EVH		 386}
387
bd238fb4 388/*
6a3124a3
LI		 389static struct v9fs_fid*
390v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
391{
392 int err;
736c4b85 393 int nfid;
6a3124a3
LI		 394 struct v9fs_fid *ret;
395 struct v9fs_fcall *fcall;
396
397 nfid = v9fs_get_idpool(&v9ses->fidpool);
398 if (nfid < 0) {
0b8dd177 399 eprintk(KERN_WARNING, "no free fids available\n");
731805b4 400 return ERR_PTR(-ENOSPC);
0b8dd177
LI		 401 }
402
6a3124a3
LI		 403 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
404 &fcall);
405
406 if (err < 0) {
41e5a6ac
LI		 407 if (fcall && fcall->id == RWALK)
408 goto clunk_fid;
409
6a3124a3
LI		 410 PRINT_FCALL_ERROR("walk error", fcall);
411 v9fs_put_idpool(nfid, &v9ses->fidpool);
412 goto error;
0b8dd177 413 }
6a3124a3 414
3cf6429a
LI		 415 kfree(fcall);
416 fcall = NULL;
6a3124a3
LI		 417 ret = v9fs_fid_create(v9ses, nfid);
418 if (!ret) {
419 err = -ENOMEM;
420 goto clunk_fid;
421 }
0b8dd177 422
6a3124a3
LI		 423 err = v9fs_fid_insert(ret, dentry);
424 if (err < 0) {
425 v9fs_fid_destroy(ret);
426 goto clunk_fid;
0b8dd177 427 }
2bad8471 428
6a3124a3 429 return ret;
2bad8471 430
6a3124a3
LI		 431clunk_fid:
432 v9fs_t_clunk(v9ses, nfid);
2bad8471 433
6a3124a3
LI		 434error:
435 kfree(fcall);
436 return ERR_PTR(err);
437}
bd238fb4 438*/
2bad8471 439
60e78d2c
AK		 440
441/**
442 * v9fs_clear_inode - release an inode
443 * @inode: inode to release
444 *
445 */
b57922d9 446void v9fs_evict_inode(struct inode *inode)
60e78d2c 447{
b57922d9
AV		 448 truncate_inode_pages(inode->i_mapping, 0);
449 end_writeback(inode);
60e78d2c
AK		 450 filemap_fdatawrite(inode->i_mapping);
451
452#ifdef CONFIG_9P_FSCACHE
453 v9fs_cache_inode_put_cookie(inode);
454#endif
455}
456
5174fdab 457static struct inode *
f0853122 458v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid,
6a3124a3
LI		 459 struct super_block *sb)
460{
461 int err, umode;
f0853122 462 struct inode *ret = NULL;
51a87c55 463 struct p9_wstat *st;
531b1094 464
bd238fb4 465 st = p9_client_stat(fid);
02bc3567
AK		 466 if (IS_ERR(st))
467 return ERR_CAST(st);
2bad8471 468
bd238fb4 469 umode = p9mode2unixmode(v9ses, st->mode);
6a3124a3
LI		 470 ret = v9fs_get_inode(sb, umode);
471 if (IS_ERR(ret)) {
472 err = PTR_ERR(ret);
6a3124a3
LI		 473 goto error;
474 }
2bad8471 475
bd238fb4
LI		 476 v9fs_stat2inode(st, ret, sb);
477 ret->i_ino = v9fs_qid2ino(&st->qid);
60e78d2c
AK		 478
479#ifdef CONFIG_9P_FSCACHE
480 v9fs_vcookie_set_qid(ret, &st->qid);
481 v9fs_cache_inode_get_cookie(ret);
482#endif
02bc3567 483 p9stat_free(st);
bd238fb4 484 kfree(st);
6a3124a3 485 return ret;
6a3124a3 486error:
02bc3567 487 p9stat_free(st);
bd238fb4 488 kfree(st);
6a3124a3 489 return ERR_PTR(err);
2bad8471
EVH		 490}
491
f0853122
SK		 492static struct inode *
493v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
494 struct super_block *sb)
495{
496 struct inode *ret = NULL;
497 int err;
498 struct p9_stat_dotl *st;
499
500 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
501 if (IS_ERR(st))
502 return ERR_CAST(st);
503
504 ret = v9fs_get_inode(sb, st->st_mode);
505 if (IS_ERR(ret)) {
506 err = PTR_ERR(ret);
507 goto error;
508 }
509
510 v9fs_stat2inode_dotl(st, ret);
511 ret->i_ino = v9fs_qid2ino(&st->qid);
512#ifdef CONFIG_9P_FSCACHE
513 v9fs_vcookie_set_qid(ret, &st->qid);
514 v9fs_cache_inode_get_cookie(ret);
515#endif
85ff872d
AK		 516 err = v9fs_get_acl(ret, fid);
517 if (err) {
518 iput(ret);
519 goto error;
520 }
f0853122
SK		 521 kfree(st);
522 return ret;
523error:
524 kfree(st);
525 return ERR_PTR(err);
526}
527
528/**
529 * v9fs_inode_from_fid - Helper routine to populate an inode by
530 * issuing a attribute request
531 * @v9ses: session information
532 * @fid: fid to issue attribute request for
533 * @sb: superblock on which to create inode
534 *
535 */
536static inline struct inode *
537v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
538 struct super_block *sb)
539{
540 if (v9fs_proto_dotl(v9ses))
541 return v9fs_inode_dotl(v9ses, fid, sb);
542 else
543 return v9fs_inode(v9ses, fid, sb);
544}
545
2bad8471
EVH		 546/**
547 * v9fs_remove - helper function to remove files and directories
73c592b9
EVH		 548 * @dir: directory inode that is being deleted
549 * @file: dentry that is being deleted
550 * @rmdir: removing a directory
2bad8471
EVH		 551 *
552 */
553
554static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
555{
d994f405 556 int retval;
bd238fb4 557 struct inode *file_inode;
bd238fb4 558 struct p9_fid *v9fid;
2bad8471 559
bd238fb4 560 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
2bad8471
EVH		 561 rmdir);
562
563 file_inode = file->d_inode;
c959df9f 564 v9fid = v9fs_fid_clone(file);
ba17674f 565 if (IS_ERR(v9fid))
da977b2c 566 return PTR_ERR(v9fid);
2bad8471 567
d994f405
AK		 568 retval = p9_client_remove(v9fid);
569 if (!retval)
570 drop_nlink(file_inode);
571 return retval;
2bad8471
EVH		 572}
573
574/**
bd238fb4 575 * v9fs_create - Create a file
ee443996
EVH		 576 * @v9ses: session information
577 * @dir: directory that dentry is being created in
bd238fb4 578 * @dentry: dentry that is being created
0e15597e 579 * @extension: 9p2000.u extension string to support devices, etc.
bd238fb4
LI		 580 * @perm: create permissions
581 * @mode: open mode
2bad8471
EVH		 582 *
583 */
bd238fb4
LI		 584static struct p9_fid *
585v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
586 struct dentry *dentry, char *extension, u32 perm, u8 mode)
2bad8471 587{
6a3124a3 588 int err;
bd238fb4
LI		 589 char *name;
590 struct p9_fid *dfid, *ofid, *fid;
6a3124a3 591 struct inode *inode;
6a3124a3 592
51a87c55
EVH		 593 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
594
bd238fb4
LI		 595 err = 0;
596 ofid = NULL;
597 fid = NULL;
598 name = (char *) dentry->d_name.name;
6d27e64d 599 dfid = v9fs_fid_lookup(dentry->d_parent);
ba17674f 600 if (IS_ERR(dfid)) {
da977b2c 601 err = PTR_ERR(dfid);
6d27e64d
VJ		 602 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
603 return ERR_PTR(err);
da977b2c 604 }
6a3124a3 605
bd238fb4
LI		 606 /* clone a fid to use for creation */
607 ofid = p9_client_walk(dfid, 0, NULL, 1);
608 if (IS_ERR(ofid)) {
609 err = PTR_ERR(ofid);
51a87c55 610 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
6d27e64d 611 return ERR_PTR(err);
bd238fb4 612 }
6a3124a3 613
bd238fb4 614 err = p9_client_fcreate(ofid, name, perm, mode, extension);
51a87c55
EVH		 615 if (err < 0) {
616 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
bd238fb4 617 goto error;
51a87c55 618 }
6a3124a3 619
bd238fb4 620 /* now walk from the parent so we can get unopened fid */
6d27e64d 621 fid = p9_client_walk(dfid, 1, &name, 1);
bd238fb4
LI		 622 if (IS_ERR(fid)) {
623 err = PTR_ERR(fid);
51a87c55 624 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
bd238fb4 625 fid = NULL;
6a3124a3 626 goto error;
6d27e64d 627 }
6a3124a3 628
bd238fb4
LI		 629 /* instantiate inode and assign the unopened fid to the dentry */
630 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
6a3124a3
LI		 631 if (IS_ERR(inode)) {
632 err = PTR_ERR(inode);
51a87c55 633 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
6a3124a3
LI		 634 goto error;
635 }
636
ba17674f 637 if (v9ses->cache)
fb045adb 638 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
e03abc0c 639 else
fb045adb 640 d_set_d_op(dentry, &v9fs_dentry_operations);
bd238fb4 641
6a3124a3 642 d_instantiate(dentry, inode);
50fb6d2b
AK		 643 err = v9fs_fid_add(dentry, fid);
644 if (err < 0)
645 goto error;
646
bd238fb4 647 return ofid;
6a3124a3 648
bd238fb4 649error:
bd238fb4
LI		 650 if (ofid)
651 p9_client_clunk(ofid);
652
653 if (fid)
654 p9_client_clunk(fid);
655
656 return ERR_PTR(err);
657}
658
5643135a
VJJ		 659/**
660 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
661 * @dir: directory inode that is being created
662 * @dentry: dentry that is being deleted
663 * @mode: create permissions
664 * @nd: path information
665 *
666 */
667
668static int
ad77dbce 669v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
5643135a
VJJ		 670 struct nameidata *nd)
671{
672 int err = 0;
673 char *name = NULL;
674 gid_t gid;
675 int flags;
ad77dbce 676 mode_t mode;
5643135a
VJJ		 677 struct v9fs_session_info *v9ses;
678 struct p9_fid *fid = NULL;
679 struct p9_fid *dfid, *ofid;
680 struct file *filp;
681 struct p9_qid qid;
682 struct inode *inode;
ad77dbce 683 struct posix_acl *pacl = NULL, *dacl = NULL;
5643135a
VJJ		 684
685 v9ses = v9fs_inode2v9ses(dir);
686 if (nd && nd->flags & LOOKUP_OPEN)
687 flags = nd->intent.open.flags - 1;
f5fc6145
AK		 688 else {
689 /*
690 * create call without LOOKUP_OPEN is due
691 * to mknod of regular files. So use mknod
692 * operation.
693 */
694 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
695 }
5643135a
VJJ		 696
697 name = (char *) dentry->d_name.name;
698 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
ad77dbce 699 "mode:0x%x\n", name, flags, omode);
5643135a
VJJ		 700
701 dfid = v9fs_fid_lookup(dentry->d_parent);
702 if (IS_ERR(dfid)) {
703 err = PTR_ERR(dfid);
704 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
705 return err;
706 }
707
708 /* clone a fid to use for creation */
709 ofid = p9_client_walk(dfid, 0, NULL, 1);
710 if (IS_ERR(ofid)) {
711 err = PTR_ERR(ofid);
712 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
713 return err;
714 }
715
716 gid = v9fs_get_fsgid_for_create(dir);
ad77dbce
AK		 717
718 mode = omode;
719 /* Update mode based on ACL value */
720 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
721 if (err) {
722 P9_DPRINTK(P9_DEBUG_VFS,
723 "Failed to get acl values in creat %d\n", err);
724 goto error;
725 }
5643135a
VJJ		 726 err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
727 if (err < 0) {
728 P9_DPRINTK(P9_DEBUG_VFS,
729 "p9_client_open_dotl failed in creat %d\n",
730 err);
731 goto error;
732 }
ad77dbce
AK		 733 /* instantiate inode and assign the unopened fid to the dentry */
734 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE ||
735 (nd && nd->flags & LOOKUP_OPEN)) {
736 fid = p9_client_walk(dfid, 1, &name, 1);
737 if (IS_ERR(fid)) {
738 err = PTR_ERR(fid);
739 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
740 err);
741 fid = NULL;
742 goto error;
743 }
5643135a 744
ad77dbce
AK		 745 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
746 if (IS_ERR(inode)) {
747 err = PTR_ERR(inode);
748 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
749 err);
750 goto error;
751 }
fb045adb 752 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
ad77dbce
AK		 753 d_instantiate(dentry, inode);
754 err = v9fs_fid_add(dentry, fid);
755 if (err < 0)
756 goto error;
757 /* The fid would get clunked via a dput */
758 fid = NULL;
759 } else {
760 /*
761 * Not in cached mode. No need to populate
762 * inode with stat. We need to get an inode
763 * so that we can set the acl with dentry
764 */
765 inode = v9fs_get_inode(dir->i_sb, mode);
766 if (IS_ERR(inode)) {
767 err = PTR_ERR(inode);
768 goto error;
769 }
fb045adb 770 d_set_d_op(dentry, &v9fs_dentry_operations);
ad77dbce
AK		 771 d_instantiate(dentry, inode);
772 }
773 /* Now set the ACL based on the default value */
774 v9fs_set_create_acl(dentry, dacl, pacl);
5643135a
VJJ		 775
776 /* if we are opening a file, assign the open fid to the file */
777 if (nd && nd->flags & LOOKUP_OPEN) {
877cb3d4 778 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
5643135a
VJJ		 779 if (IS_ERR(filp)) {
780 p9_client_clunk(ofid);
781 return PTR_ERR(filp);
782 }
783 filp->private_data = ofid;
784 } else
785 p9_client_clunk(ofid);
786
787 return 0;
788
789error:
790 if (ofid)
791 p9_client_clunk(ofid);
792 if (fid)
793 p9_client_clunk(fid);
794 return err;
795}
796
bd238fb4
LI		 797/**
798 * v9fs_vfs_create - VFS hook to create files
ee443996 799 * @dir: directory inode that is being created
bd238fb4
LI		 800 * @dentry: dentry that is being deleted
801 * @mode: create permissions
802 * @nd: path information
803 *
804 */
6a3124a3 805
bd238fb4
LI		 806static int
807v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
808 struct nameidata *nd)
809{
810 int err;
811 u32 perm;
812 int flags;
813 struct v9fs_session_info *v9ses;
814 struct p9_fid *fid;
815 struct file *filp;
816
817 err = 0;
818 fid = NULL;
819 v9ses = v9fs_inode2v9ses(dir);
820 perm = unixmode2p9mode(v9ses, mode);
821 if (nd && nd->flags & LOOKUP_OPEN)
822 flags = nd->intent.open.flags - 1;
823 else
824 flags = O_RDWR;
825
826 fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
dd6102fb
SK		 827 v9fs_uflags2omode(flags,
828 v9fs_proto_dotu(v9ses)));
bd238fb4
LI		 829 if (IS_ERR(fid)) {
830 err = PTR_ERR(fid);
831 fid = NULL;
832 goto error;
833 }
834
835 /* if we are opening a file, assign the open fid to the file */
836 if (nd && nd->flags & LOOKUP_OPEN) {
877cb3d4 837 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
6a3124a3 838 if (IS_ERR(filp)) {
bd238fb4
LI		 839 err = PTR_ERR(filp);
840 goto error;
6a3124a3
LI		 841 }
842
bd238fb4
LI		 843 filp->private_data = fid;
844 } else
845 p9_client_clunk(fid);
6a3124a3
LI		 846
847 return 0;
848
849error:
bd238fb4
LI		 850 if (fid)
851 p9_client_clunk(fid);
6a3124a3 852
6a3124a3 853 return err;
2bad8471
EVH		 854}
855
856/**
857 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
ee443996 858 * @dir: inode that is being unlinked
2bad8471
EVH		 859 * @dentry: dentry that is being unlinked
860 * @mode: mode for new directory
861 *
862 */
863
6a3124a3 864static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
2bad8471 865{
6a3124a3 866 int err;
bd238fb4 867 u32 perm;
6a3124a3 868 struct v9fs_session_info *v9ses;
bd238fb4 869 struct p9_fid *fid;
6a3124a3 870
bd238fb4
LI		 871 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
872 err = 0;
6a3124a3 873 v9ses = v9fs_inode2v9ses(dir);
6a3124a3 874 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
bd238fb4
LI		 875 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
876 if (IS_ERR(fid)) {
877 err = PTR_ERR(fid);
878 fid = NULL;
6a3124a3
LI		 879 }
880
bd238fb4
LI		 881 if (fid)
882 p9_client_clunk(fid);
6a3124a3 883
6a3124a3 884 return err;
2bad8471
EVH		 885}
886
01a622bd
MK		 887
888/**
889 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
890 * @dir: inode that is being unlinked
891 * @dentry: dentry that is being unlinked
892 * @mode: mode for new directory
893 *
894 */
895
ad77dbce
AK		 896static int v9fs_vfs_mkdir_dotl(struct inode *dir,
897 struct dentry *dentry, int omode)
01a622bd
MK		 898{
899 int err;
900 struct v9fs_session_info *v9ses;
901 struct p9_fid *fid = NULL, *dfid = NULL;
902 gid_t gid;
903 char *name;
ad77dbce 904 mode_t mode;
01a622bd
MK		 905 struct inode *inode;
906 struct p9_qid qid;
907 struct dentry *dir_dentry;
ad77dbce 908 struct posix_acl *dacl = NULL, *pacl = NULL;
01a622bd
MK		 909
910 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
911 err = 0;
912 v9ses = v9fs_inode2v9ses(dir);
913
ad77dbce 914 omode |= S_IFDIR;
7c7298cf 915 if (dir->i_mode & S_ISGID)
ad77dbce
AK		 916 omode |= S_ISGID;
917
01a622bd
MK		 918 dir_dentry = v9fs_dentry_from_dir_inode(dir);
919 dfid = v9fs_fid_lookup(dir_dentry);
920 if (IS_ERR(dfid)) {
921 err = PTR_ERR(dfid);
922 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
923 dfid = NULL;
924 goto error;
925 }
926
927 gid = v9fs_get_fsgid_for_create(dir);
ad77dbce
AK		 928 mode = omode;
929 /* Update mode based on ACL value */
930 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
931 if (err) {
932 P9_DPRINTK(P9_DEBUG_VFS,
933 "Failed to get acl values in mkdir %d\n", err);
934 goto error;
935 }
01a622bd
MK		 936 name = (char *) dentry->d_name.name;
937 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
938 if (err < 0)
939 goto error;
940
941 /* instantiate inode and assign the unopened fid to the dentry */
942 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
943 fid = p9_client_walk(dfid, 1, &name, 1);
944 if (IS_ERR(fid)) {
945 err = PTR_ERR(fid);
946 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
947 err);
948 fid = NULL;
949 goto error;
950 }
951
952 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
953 if (IS_ERR(inode)) {
954 err = PTR_ERR(inode);
955 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
956 err);
957 goto error;
958 }
fb045adb 959 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
01a622bd
MK		 960 d_instantiate(dentry, inode);
961 err = v9fs_fid_add(dentry, fid);
962 if (err < 0)
963 goto error;
964 fid = NULL;
ad77dbce
AK		 965 } else {
966 /*
967 * Not in cached mode. No need to populate
968 * inode with stat. We need to get an inode
969 * so that we can set the acl with dentry
970 */
971 inode = v9fs_get_inode(dir->i_sb, mode);
972 if (IS_ERR(inode)) {
973 err = PTR_ERR(inode);
974 goto error;
975 }
fb045adb 976 d_set_d_op(dentry, &v9fs_dentry_operations);
ad77dbce 977 d_instantiate(dentry, inode);
01a622bd 978 }
ad77dbce
AK		 979 /* Now set the ACL based on the default value */
980 v9fs_set_create_acl(dentry, dacl, pacl);
981
01a622bd
MK		 982error:
983 if (fid)
984 p9_client_clunk(fid);
985 return err;
986}
987
2bad8471
EVH		 988/**
989 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
990 * @dir: inode that is being walked from
991 * @dentry: dentry that is being walked to?
992 * @nameidata: path data
993 *
994 */
995
996static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
997 struct nameidata *nameidata)
998{
999 struct super_block *sb;
1000 struct v9fs_session_info *v9ses;
bd238fb4 1001 struct p9_fid *dfid, *fid;
2bad8471 1002 struct inode *inode;
bd238fb4 1003 char *name;
2bad8471
EVH		 1004 int result = 0;
1005
bd238fb4 1006 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
731805b4 1007 dir, dentry->d_name.name, dentry, nameidata);
2bad8471 1008
11e9b49b
SK		 1009 if (dentry->d_name.len > NAME_MAX)
1010 return ERR_PTR(-ENAMETOOLONG);
1011
2bad8471
EVH		 1012 sb = dir->i_sb;
1013 v9ses = v9fs_inode2v9ses(dir);
a534c8d1 1014 /* We can walk d_parent because we hold the dir->i_mutex */
bd238fb4
LI		 1015 dfid = v9fs_fid_lookup(dentry->d_parent);
1016 if (IS_ERR(dfid))
e231c2ee 1017 return ERR_CAST(dfid);
bd238fb4
LI		 1018
1019 name = (char *) dentry->d_name.name;
1020 fid = p9_client_walk(dfid, 1, &name, 1);
1021 if (IS_ERR(fid)) {
1022 result = PTR_ERR(fid);
2bad8471 1023 if (result == -ENOENT) {
85e0df24
AK		 1024 inode = NULL;
1025 goto inst_out;
2bad8471 1026 }
2bad8471 1027
bd238fb4 1028 return ERR_PTR(result);
2bad8471
EVH		 1029 }
1030
bd238fb4
LI		 1031 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1032 if (IS_ERR(inode)) {
1033 result = PTR_ERR(inode);
1034 inode = NULL;
1035 goto error;
2bad8471
EVH		 1036 }
1037
bd238fb4 1038 result = v9fs_fid_add(dentry, fid);
6a3124a3 1039 if (result < 0)
9856af8b 1040 goto error_iput;
6a3124a3 1041
85e0df24
AK		 1042inst_out:
1043 if (v9ses->cache)
fb045adb 1044 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
e03abc0c 1045 else
fb045adb 1046 d_set_d_op(dentry, &v9fs_dentry_operations);
2bad8471
EVH		 1047
1048 d_add(dentry, inode);
2bad8471
EVH		 1049 return NULL;
1050
9856af8b
AK		 1051error_iput:
1052 iput(inode);
bd238fb4 1053error:
62aa528e 1054 p9_client_clunk(fid);
da977b2c 1055
2bad8471
EVH		 1056 return ERR_PTR(result);
1057}
1058
1059/**
1060 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
1061 * @i: inode that is being unlinked
73c592b9 1062 * @d: dentry that is being unlinked
2bad8471
EVH		 1063 *
1064 */
1065
1066static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
1067{
1068 return v9fs_remove(i, d, 0);
1069}
1070
1071/**
1072 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
1073 * @i: inode that is being unlinked
73c592b9 1074 * @d: dentry that is being unlinked
2bad8471
EVH		 1075 *
1076 */
1077
1078static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
1079{
1080 return v9fs_remove(i, d, 1);
1081}
1082
1083/**
1084 * v9fs_vfs_rename - VFS hook to rename an inode
1085 * @old_dir: old dir inode
1086 * @old_dentry: old dentry
1087 * @new_dir: new dir inode
1088 * @new_dentry: new dentry
1089 *
1090 */
1091
1092static int
1093v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1094 struct inode *new_dir, struct dentry *new_dentry)
1095{
bd238fb4
LI		 1096 struct inode *old_inode;
1097 struct v9fs_session_info *v9ses;
1098 struct p9_fid *oldfid;
1099 struct p9_fid *olddirfid;
1100 struct p9_fid *newdirfid;
1101 struct p9_wstat wstat;
1102 int retval;
2bad8471 1103
bd238fb4
LI		 1104 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1105 retval = 0;
1106 old_inode = old_dentry->d_inode;
1107 v9ses = v9fs_inode2v9ses(old_inode);
1108 oldfid = v9fs_fid_lookup(old_dentry);
ba17674f 1109 if (IS_ERR(oldfid))
da977b2c
EVH		 1110 return PTR_ERR(oldfid);
1111
1112 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
ba17674f 1113 if (IS_ERR(olddirfid)) {
da977b2c 1114 retval = PTR_ERR(olddirfid);
bd238fb4 1115 goto done;
da977b2c
EVH		 1116 }
1117
1118 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
ba17674f 1119 if (IS_ERR(newdirfid)) {
da977b2c 1120 retval = PTR_ERR(newdirfid);
bd238fb4 1121 goto clunk_olddir;
2bad8471
EVH		 1122 }
1123
a534c8d1 1124 down_write(&v9ses->rename_sem);
4681dbda
SK		 1125 if (v9fs_proto_dotl(v9ses)) {
1126 retval = p9_client_rename(oldfid, newdirfid,
1127 (char *) new_dentry->d_name.name);
1128 if (retval != -ENOSYS)
1129 goto clunk_newdir;
1130 }
a534c8d1
AK		 1131 if (old_dentry->d_parent != new_dentry->d_parent) {
1132 /*
1133 * 9P .u can only handle file rename in the same directory
1134 */
4681dbda 1135
bd238fb4
LI		 1136 P9_DPRINTK(P9_DEBUG_ERROR,
1137 "old dir and new dir are different\n");
621997cd 1138 retval = -EXDEV;
bd238fb4 1139 goto clunk_newdir;
2bad8471 1140 }
531b1094 1141 v9fs_blank_wstat(&wstat);
ba17674f 1142 wstat.muid = v9ses->uname;
531b1094 1143 wstat.name = (char *) new_dentry->d_name.name;
bd238fb4 1144 retval = p9_client_wstat(oldfid, &wstat);
2bad8471 1145
bd238fb4 1146clunk_newdir:
a534c8d1
AK		 1147 if (!retval)
1148 /* successful rename */
1149 d_move(old_dentry, new_dentry);
1150 up_write(&v9ses->rename_sem);
22150c4f 1151 p9_client_clunk(newdirfid);
2bad8471 1152
bd238fb4 1153clunk_olddir:
22150c4f 1154 p9_client_clunk(olddirfid);
da977b2c 1155
bd238fb4 1156done:
2bad8471
EVH		 1157 return retval;
1158}
1159
1160/**
943ffb58 1161 * v9fs_vfs_getattr - retrieve file metadata
ee443996
EVH		 1162 * @mnt: mount information
1163 * @dentry: file to get attributes on
1164 * @stat: metadata structure to populate
2bad8471
EVH		 1165 *
1166 */
1167
1168static int
1169v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1170 struct kstat *stat)
1171{
bd238fb4
LI		 1172 int err;
1173 struct v9fs_session_info *v9ses;
1174 struct p9_fid *fid;
51a87c55 1175 struct p9_wstat *st;
bd238fb4
LI		 1176
1177 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1178 err = -EPERM;
1179 v9ses = v9fs_inode2v9ses(dentry->d_inode);
60e78d2c 1180 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
9523a841
EVH		 1181 return simple_getattr(mnt, dentry, stat);
1182
bd238fb4
LI		 1183 fid = v9fs_fid_lookup(dentry);
1184 if (IS_ERR(fid))
da977b2c 1185 return PTR_ERR(fid);
2bad8471 1186
bd238fb4
LI		 1187 st = p9_client_stat(fid);
1188 if (IS_ERR(st))
1189 return PTR_ERR(st);
2bad8471 1190
bd238fb4 1191 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
2bad8471 1192 generic_fillattr(dentry->d_inode, stat);
2bad8471 1193
62b2be59 1194 p9stat_free(st);
bd238fb4
LI		 1195 kfree(st);
1196 return 0;
2bad8471
EVH		 1197}
1198
f0853122
SK		 1199static int
1200v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
1201 struct kstat *stat)
1202{
1203 int err;
1204 struct v9fs_session_info *v9ses;
1205 struct p9_fid *fid;
1206 struct p9_stat_dotl *st;
1207
1208 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
1209 err = -EPERM;
1210 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1211 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
1212 return simple_getattr(mnt, dentry, stat);
1213
1214 fid = v9fs_fid_lookup(dentry);
1215 if (IS_ERR(fid))
1216 return PTR_ERR(fid);
1217
1218 /* Ask for all the fields in stat structure. Server will return
1219 * whatever it supports
1220 */
1221
1222 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
1223 if (IS_ERR(st))
1224 return PTR_ERR(st);
1225
1226 v9fs_stat2inode_dotl(st, dentry->d_inode);
1227 generic_fillattr(dentry->d_inode, stat);
1228 /* Change block size to what the server returned */
1229 stat->blksize = st->st_blksize;
1230
1231 kfree(st);
1232 return 0;
1233}
1234
2bad8471
EVH		 1235/**
1236 * v9fs_vfs_setattr - set file metadata
1237 * @dentry: file whose metadata to set
1238 * @iattr: metadata assignment structure
1239 *
1240 */
1241
1242static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
1243{
bd238fb4
LI		 1244 int retval;
1245 struct v9fs_session_info *v9ses;
1246 struct p9_fid *fid;
1247 struct p9_wstat wstat;
2bad8471 1248
bd238fb4
LI		 1249 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1250 retval = -EPERM;
1251 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1252 fid = v9fs_fid_lookup(dentry);
da977b2c
EVH		 1253 if(IS_ERR(fid))
1254 return PTR_ERR(fid);
2bad8471 1255
531b1094 1256 v9fs_blank_wstat(&wstat);
2bad8471 1257 if (iattr->ia_valid & ATTR_MODE)
531b1094 1258 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
2bad8471
EVH		 1259
1260 if (iattr->ia_valid & ATTR_MTIME)
531b1094 1261 wstat.mtime = iattr->ia_mtime.tv_sec;
2bad8471
EVH		 1262
1263 if (iattr->ia_valid & ATTR_ATIME)
531b1094 1264 wstat.atime = iattr->ia_atime.tv_sec;
2bad8471
EVH		 1265
1266 if (iattr->ia_valid & ATTR_SIZE)
531b1094 1267 wstat.length = iattr->ia_size;
2bad8471 1268
dd6102fb 1269 if (v9fs_proto_dotu(v9ses)) {
531b1094
LI		 1270 if (iattr->ia_valid & ATTR_UID)
1271 wstat.n_uid = iattr->ia_uid;
2bad8471 1272
531b1094
LI		 1273 if (iattr->ia_valid & ATTR_GID)
1274 wstat.n_gid = iattr->ia_gid;
2bad8471
EVH		 1275 }
1276
bd238fb4 1277 retval = p9_client_wstat(fid, &wstat);
1025774c
CH		 1278 if (retval < 0)
1279 return retval;
2bad8471 1280
1025774c
CH		 1281 if ((iattr->ia_valid & ATTR_SIZE) &&
1282 iattr->ia_size != i_size_read(dentry->d_inode)) {
1283 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
1284 if (retval)
1285 return retval;
1286 }
2bad8471 1287
1025774c
CH		 1288 setattr_copy(dentry->d_inode, iattr);
1289 mark_inode_dirty(dentry->d_inode);
1290 return 0;
2bad8471
EVH		 1291}
1292
87d7845a
SK		 1293/**
1294 * v9fs_vfs_setattr_dotl - set file metadata
1295 * @dentry: file whose metadata to set
1296 * @iattr: metadata assignment structure
1297 *
1298 */
1299
22d8dcdf 1300int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
87d7845a
SK		 1301{
1302 int retval;
1303 struct v9fs_session_info *v9ses;
1304 struct p9_fid *fid;
1305 struct p9_iattr_dotl p9attr;
1306
1307 P9_DPRINTK(P9_DEBUG_VFS, "\n");
1308
1309 retval = inode_change_ok(dentry->d_inode, iattr);
1310 if (retval)
1311 return retval;
1312
1313 p9attr.valid = iattr->ia_valid;
1314 p9attr.mode = iattr->ia_mode;
1315 p9attr.uid = iattr->ia_uid;
1316 p9attr.gid = iattr->ia_gid;
1317 p9attr.size = iattr->ia_size;
1318 p9attr.atime_sec = iattr->ia_atime.tv_sec;
1319 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
1320 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
1321 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
1322
1323 retval = -EPERM;
1324 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1325 fid = v9fs_fid_lookup(dentry);
1326 if (IS_ERR(fid))
1327 return PTR_ERR(fid);
1328
1329 retval = p9_client_setattr(fid, &p9attr);
8cef9c67
SR		 1330 if (retval < 0)
1331 return retval;
87d7845a 1332
8cef9c67
SR		 1333 if ((iattr->ia_valid & ATTR_SIZE) &&
1334 iattr->ia_size != i_size_read(dentry->d_inode)) {
1335 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
1336 if (retval)
1337 return retval;
1338 }
1339
1340 setattr_copy(dentry->d_inode, iattr);
1341 mark_inode_dirty(dentry->d_inode);
6e8dc555
AK		 1342 if (iattr->ia_valid & ATTR_MODE) {
1343 /* We also want to update ACL when we update mode bits */
1344 retval = v9fs_acl_chmod(dentry);
1345 if (retval < 0)
1346 return retval;
1347 }
8cef9c67 1348 return 0;
87d7845a
SK		 1349}
1350
2bad8471 1351/**
531b1094
LI		 1352 * v9fs_stat2inode - populate an inode structure with mistat info
1353 * @stat: Plan 9 metadata (mistat) structure
2bad8471
EVH		 1354 * @inode: inode to populate
1355 * @sb: superblock of filesystem
1356 *
1357 */
1358
1359void
51a87c55 1360v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
531b1094 1361 struct super_block *sb)
2bad8471 1362{
531b1094 1363 char ext[32];
5717144a
AK		 1364 char tag_name[14];
1365 unsigned int i_nlink;
2bad8471
EVH		 1366 struct v9fs_session_info *v9ses = sb->s_fs_info;
1367
1368 inode->i_nlink = 1;
1369
531b1094
LI		 1370 inode->i_atime.tv_sec = stat->atime;
1371 inode->i_mtime.tv_sec = stat->mtime;
1372 inode->i_ctime.tv_sec = stat->mtime;
2bad8471 1373
bd32b82d
LI		 1374 inode->i_uid = v9ses->dfltuid;
1375 inode->i_gid = v9ses->dfltgid;
2bad8471 1376
dd6102fb 1377 if (v9fs_proto_dotu(v9ses)) {
531b1094
LI		 1378 inode->i_uid = stat->n_uid;
1379 inode->i_gid = stat->n_gid;
2bad8471 1380 }
5717144a
AK		 1381 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
1382 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
1383 /*
1384 * Hadlink support got added later to
1385 * to the .u extension. So there can be
1386 * server out there that doesn't support
1387 * this even with .u extension. So check
1388 * for non NULL stat->extension
1389 */
1390 strncpy(ext, stat->extension, sizeof(ext));
1391 /* HARDLINKCOUNT %u */
1392 sscanf(ext, "%13s %u", tag_name, &i_nlink);
1393 if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
1394 inode->i_nlink = i_nlink;
1395 }
1396 }
531b1094 1397 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
2bad8471
EVH		 1398 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
1399 char type = 0;
1400 int major = -1;
1401 int minor = -1;
531b1094 1402
51a87c55 1403 strncpy(ext, stat->extension, sizeof(ext));
531b1094 1404 sscanf(ext, "%c %u %u", &type, &major, &minor);
2bad8471
EVH		 1405 switch (type) {
1406 case 'c':
1407 inode->i_mode &= ~S_IFBLK;
1408 inode->i_mode |= S_IFCHR;
1409 break;
1410 case 'b':
1411 break;
1412 default:
bd238fb4 1413 P9_DPRINTK(P9_DEBUG_ERROR,
51a87c55
EVH		 1414 "Unknown special type %c %s\n", type,
1415 stat->extension);
2bad8471
EVH		 1416 };
1417 inode->i_rdev = MKDEV(major, minor);
57c7b4e6 1418 init_special_inode(inode, inode->i_mode, inode->i_rdev);
2bad8471
EVH		 1419 } else
1420 inode->i_rdev = 0;
1421
7549ae3e 1422 i_size_write(inode, stat->length);
2bad8471 1423
bd238fb4 1424 /* not real number of blocks, but 512 byte ones ... */
7549ae3e 1425 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
2bad8471
EVH		 1426}
1427
f0853122
SK		 1428/**
1429 * v9fs_stat2inode_dotl - populate an inode structure with stat info
1430 * @stat: stat structure
1431 * @inode: inode to populate
1432 * @sb: superblock of filesystem
1433 *
1434 */
1435
1436void
1437v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
1438{
1439
1440 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
1441 inode->i_atime.tv_sec = stat->st_atime_sec;
1442 inode->i_atime.tv_nsec = stat->st_atime_nsec;
1443 inode->i_mtime.tv_sec = stat->st_mtime_sec;
1444 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
1445 inode->i_ctime.tv_sec = stat->st_ctime_sec;
1446 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
1447 inode->i_uid = stat->st_uid;
1448 inode->i_gid = stat->st_gid;
1449 inode->i_nlink = stat->st_nlink;
1450 inode->i_mode = stat->st_mode;
1451 inode->i_rdev = new_decode_dev(stat->st_rdev);
1452
1453 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
1454 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1455
1456 i_size_write(inode, stat->st_size);
1457 inode->i_blocks = stat->st_blocks;
1458 } else {
1459 if (stat->st_result_mask & P9_STATS_ATIME) {
1460 inode->i_atime.tv_sec = stat->st_atime_sec;
1461 inode->i_atime.tv_nsec = stat->st_atime_nsec;
1462 }
1463 if (stat->st_result_mask & P9_STATS_MTIME) {
1464 inode->i_mtime.tv_sec = stat->st_mtime_sec;
1465 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
1466 }
1467 if (stat->st_result_mask & P9_STATS_CTIME) {
1468 inode->i_ctime.tv_sec = stat->st_ctime_sec;
1469 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
1470 }
1471 if (stat->st_result_mask & P9_STATS_UID)
1472 inode->i_uid = stat->st_uid;
1473 if (stat->st_result_mask & P9_STATS_GID)
1474 inode->i_gid = stat->st_gid;
1475 if (stat->st_result_mask & P9_STATS_NLINK)
1476 inode->i_nlink = stat->st_nlink;
1477 if (stat->st_result_mask & P9_STATS_MODE) {
1478 inode->i_mode = stat->st_mode;
1479 if ((S_ISBLK(inode->i_mode)) ||
1480 (S_ISCHR(inode->i_mode)))
1481 init_special_inode(inode, inode->i_mode,
1482 inode->i_rdev);
1483 }
1484 if (stat->st_result_mask & P9_STATS_RDEV)
1485 inode->i_rdev = new_decode_dev(stat->st_rdev);
1486 if (stat->st_result_mask & P9_STATS_SIZE)
1487 i_size_write(inode, stat->st_size);
1488 if (stat->st_result_mask & P9_STATS_BLOCKS)
1489 inode->i_blocks = stat->st_blocks;
1490 }
1491 if (stat->st_result_mask & P9_STATS_GEN)
1492 inode->i_generation = stat->st_gen;
1493
1494 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
1495 * because the inode structure does not have fields for them.
1496 */
1497}
1498
2bad8471
EVH		 1499/**
1500 * v9fs_qid2ino - convert qid into inode number
1501 * @qid: qid to hash
1502 *
1503 * BUG: potential for inode number collisions?
1504 */
1505
bd238fb4 1506ino_t v9fs_qid2ino(struct p9_qid *qid)
2bad8471
EVH		 1507{
1508 u64 path = qid->path + 2;
1509 ino_t i = 0;
1510
1511 if (sizeof(ino_t) == sizeof(path))
1512 memcpy(&i, &path, sizeof(ino_t));
1513 else
1514 i = (ino_t) (path ^ (path >> 32));
1515
1516 return i;
1517}
1518
2bad8471
EVH		 1519/**
1520 * v9fs_readlink - read a symlink's location (internal version)
1521 * @dentry: dentry for symlink
73c592b9 1522 * @buffer: buffer to load symlink location into
2bad8471
EVH		 1523 * @buflen: length of buffer
1524 *
1525 */
1526
1527static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1528{
bd238fb4 1529 int retval;
2bad8471 1530
bd238fb4
LI		 1531 struct v9fs_session_info *v9ses;
1532 struct p9_fid *fid;
51a87c55 1533 struct p9_wstat *st;
2bad8471 1534
bd238fb4
LI		 1535 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
1536 retval = -EPERM;
1537 v9ses = v9fs_inode2v9ses(dentry->d_inode);
1538 fid = v9fs_fid_lookup(dentry);
ba17674f 1539 if (IS_ERR(fid))
da977b2c 1540 return PTR_ERR(fid);
2bad8471 1541
329176cc 1542 if (!v9fs_proto_dotu(v9ses))
bd238fb4 1543 return -EBADF;
2bad8471 1544
bd238fb4
LI		 1545 st = p9_client_stat(fid);
1546 if (IS_ERR(st))
1547 return PTR_ERR(st);
2bad8471 1548
bd238fb4 1549 if (!(st->mode & P9_DMSYMLINK)) {
2bad8471 1550 retval = -EINVAL;
bd238fb4 1551 goto done;
2bad8471
EVH		 1552 }
1553
1554 /* copy extension buffer into buffer */
51a87c55 1555 strncpy(buffer, st->extension, buflen);
2bad8471 1556
bd238fb4 1557 P9_DPRINTK(P9_DEBUG_VFS,
51a87c55 1558 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
2bad8471 1559
2511cd0b 1560 retval = strnlen(buffer, buflen);
bd238fb4 1561done:
62b2be59 1562 p9stat_free(st);
bd238fb4 1563 kfree(st);
2bad8471
EVH		 1564 return retval;
1565}
1566
2bad8471
EVH		 1567/**
1568 * v9fs_vfs_follow_link - follow a symlink path
1569 * @dentry: dentry for symlink
1570 * @nd: nameidata
1571 *
1572 */
1573
1574static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1575{
1576 int len = 0;
1577 char *link = __getname();
1578
bd238fb4 1579 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
2bad8471
EVH		 1580
1581 if (!link)
1582 link = ERR_PTR(-ENOMEM);
1583 else {
16cce6d2 1584 len = v9fs_readlink(dentry, link, PATH_MAX);
2bad8471
EVH		 1585
1586 if (len < 0) {
ce44eeb6 1587 __putname(link);
2bad8471
EVH		 1588 link = ERR_PTR(len);
1589 } else
2511cd0b 1590 link[min(len, PATH_MAX-1)] = 0;
2bad8471
EVH		 1591 }
1592 nd_set_link(nd, link);
1593
1594 return NULL;
1595}
1596
1597/**
1598 * v9fs_vfs_put_link - release a symlink path
1599 * @dentry: dentry for symlink
1600 * @nd: nameidata
ee443996 1601 * @p: unused
2bad8471
EVH		 1602 *
1603 */
1604
ee443996
EVH		 1605static void
1606v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
2bad8471
EVH		 1607{
1608 char *s = nd_get_link(nd);
1609
6ff23207
DG		 1610 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
1611 IS_ERR(s) ? "<error>" : s);
2bad8471 1612 if (!IS_ERR(s))
ce44eeb6 1613 __putname(s);
2bad8471
EVH		 1614}
1615
ee443996
EVH		 1616/**
1617 * v9fs_vfs_mkspecial - create a special file
1618 * @dir: inode to create special file in
1619 * @dentry: dentry to create
1620 * @mode: mode to create special file
1621 * @extension: 9p2000.u format extension string representing special file
1622 *
1623 */
1624
531b1094
LI		 1625static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1626 int mode, const char *extension)
2bad8471 1627{
bd238fb4 1628 u32 perm;
531b1094 1629 struct v9fs_session_info *v9ses;
bd238fb4 1630 struct p9_fid *fid;
2bad8471 1631
6a3124a3 1632 v9ses = v9fs_inode2v9ses(dir);
dd6102fb 1633 if (!v9fs_proto_dotu(v9ses)) {
bd238fb4 1634 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
6a3124a3 1635 return -EPERM;
2bad8471
EVH		 1636 }
1637
da977b2c 1638 perm = unixmode2p9mode(v9ses, mode);
bd238fb4
LI		 1639 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
1640 P9_OREAD);
1641 if (IS_ERR(fid))
1642 return PTR_ERR(fid);
da977b2c 1643
bd238fb4 1644 p9_client_clunk(fid);
6a3124a3 1645 return 0;
531b1094
LI		 1646}
1647
50cc42ff
VJJ		 1648/**
1649 * v9fs_vfs_symlink_dotl - helper function to create symlinks
1650 * @dir: directory inode containing symlink
1651 * @dentry: dentry for symlink
1652 * @symname: symlink data
1653 *
1654 * See Also: 9P2000.L RFC for more information
1655 *
1656 */
1657
1658static int
1659v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
1660 const char *symname)
1661{
1662 struct v9fs_session_info *v9ses;
1663 struct p9_fid *dfid;
1664 struct p9_fid *fid = NULL;
1665 struct inode *inode;
1666 struct p9_qid qid;
1667 char *name;
1668 int err;
1669 gid_t gid;
1670
1671 name = (char *) dentry->d_name.name;
1672 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
1673 dir->i_ino, name, symname);
1674 v9ses = v9fs_inode2v9ses(dir);
1675
1676 dfid = v9fs_fid_lookup(dentry->d_parent);
1677 if (IS_ERR(dfid)) {
1678 err = PTR_ERR(dfid);
1679 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
1680 return err;
1681 }
1682
1683 gid = v9fs_get_fsgid_for_create(dir);
1684
50cc42ff
VJJ		 1685 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
1686 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
1687
1688 if (err < 0) {
1689 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
1690 goto error;
1691 }
1692
1693 if (v9ses->cache) {
1694 /* Now walk from the parent so we can get an unopened fid. */
1695 fid = p9_client_walk(dfid, 1, &name, 1);
1696 if (IS_ERR(fid)) {
1697 err = PTR_ERR(fid);
1698 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
1699 err);
1700 fid = NULL;
1701 goto error;
1702 }
1703
1704 /* instantiate inode and assign the unopened fid to dentry */
1705 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1706 if (IS_ERR(inode)) {
1707 err = PTR_ERR(inode);
1708 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
1709 err);
1710 goto error;
1711 }
fb045adb 1712 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
50cc42ff
VJJ		 1713 d_instantiate(dentry, inode);
1714 err = v9fs_fid_add(dentry, fid);
1715 if (err < 0)
1716 goto error;
1717 fid = NULL;
1718 } else {
1719 /* Not in cached mode. No need to populate inode with stat */
1720 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
1721 if (IS_ERR(inode)) {
1722 err = PTR_ERR(inode);
1723 goto error;
1724 }
fb045adb 1725 d_set_d_op(dentry, &v9fs_dentry_operations);
50cc42ff
VJJ		 1726 d_instantiate(dentry, inode);
1727 }
1728
1729error:
1730 if (fid)
1731 p9_client_clunk(fid);
1732
1733 return err;
1734}
1735
531b1094
LI		 1736/**
1737 * v9fs_vfs_symlink - helper function to create symlinks
1738 * @dir: directory inode containing symlink
1739 * @dentry: dentry for symlink
1740 * @symname: symlink data
1741 *
ee443996 1742 * See Also: 9P2000.u RFC for more information
531b1094
LI		 1743 *
1744 */
1745
1746static int
1747v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1748{
bd238fb4
LI		 1749 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
1750 dentry->d_name.name, symname);
531b1094
LI		 1751
1752 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1753}
1754
1755/**
1756 * v9fs_vfs_link - create a hardlink
1757 * @old_dentry: dentry for file to link to
1758 * @dir: inode destination for new link
1759 * @dentry: dentry for link
1760 *
1761 */
1762
531b1094
LI		 1763static int
1764v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1765 struct dentry *dentry)
1766{
1767 int retval;
bd238fb4 1768 struct p9_fid *oldfid;
531b1094
LI		 1769 char *name;
1770
bd238fb4
LI		 1771 P9_DPRINTK(P9_DEBUG_VFS,
1772 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
531b1094
LI		 1773 old_dentry->d_name.name);
1774
da977b2c 1775 oldfid = v9fs_fid_clone(old_dentry);
ba17674f 1776 if (IS_ERR(oldfid))
da977b2c 1777 return PTR_ERR(oldfid);
531b1094
LI		 1778
1779 name = __getname();
da977b2c
EVH		 1780 if (unlikely(!name)) {
1781 retval = -ENOMEM;
1782 goto clunk_fid;
1783 }
0710d36a 1784
16cce6d2 1785 sprintf(name, "%d\n", oldfid->fid);
bd238fb4 1786 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
531b1094 1787 __putname(name);
2bad8471 1788
da977b2c 1789clunk_fid:
bd238fb4 1790 p9_client_clunk(oldfid);
2bad8471
EVH		 1791 return retval;
1792}
1793
09d34ee5
EVH		 1794/**
1795 * v9fs_vfs_link_dotl - create a hardlink for dotl
1796 * @old_dentry: dentry for file to link to
1797 * @dir: inode destination for new link
1798 * @dentry: dentry for link
1799 *
1800 */
1801
1802static int
1803v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
1804 struct dentry *dentry)
1805{
1806 int err;
1807 struct p9_fid *dfid, *oldfid;
1808 char *name;
1809 struct v9fs_session_info *v9ses;
1810 struct dentry *dir_dentry;
1811
1812 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
1813 dir->i_ino, old_dentry->d_name.name,
1814 dentry->d_name.name);
1815
1816 v9ses = v9fs_inode2v9ses(dir);
1817 dir_dentry = v9fs_dentry_from_dir_inode(dir);
1818 dfid = v9fs_fid_lookup(dir_dentry);
1819 if (IS_ERR(dfid))
1820 return PTR_ERR(dfid);
1821
1822 oldfid = v9fs_fid_lookup(old_dentry);
1823 if (IS_ERR(oldfid))
1824 return PTR_ERR(oldfid);
1825
1826 name = (char *) dentry->d_name.name;
1827
1828 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
1829
1830 if (err < 0) {
1831 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
1832 return err;
1833 }
1834
1835 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1836 /* Get the latest stat info from server. */
1837 struct p9_fid *fid;
1838 struct p9_stat_dotl *st;
1839
1840 fid = v9fs_fid_lookup(old_dentry);
1841 if (IS_ERR(fid))
1842 return PTR_ERR(fid);
1843
1844 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
1845 if (IS_ERR(st))
1846 return PTR_ERR(st);
1847
1848 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
1849
1850 kfree(st);
1851 } else {
1852 /* Caching disabled. No need to get upto date stat info.
7de9c6ee
AV		 1853 * This dentry will be released immediately. So, just hold the
1854 * inode
09d34ee5 1855 */
7de9c6ee 1856 ihold(old_dentry->d_inode);
09d34ee5
EVH		 1857 }
1858
fb045adb 1859 d_set_d_op(dentry, old_dentry->d_op);
09d34ee5
EVH		 1860 d_instantiate(dentry, old_dentry->d_inode);
1861
1862 return err;
1863}
1864
2bad8471
EVH		 1865/**
1866 * v9fs_vfs_mknod - create a special file
1867 * @dir: inode destination for new link
1868 * @dentry: dentry for file
1869 * @mode: mode for creation
ee443996 1870 * @rdev: device associated with special file
2bad8471
EVH		 1871 *
1872 */
1873
1874static int
1875v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1876{
531b1094
LI		 1877 int retval;
1878 char *name;
2bad8471 1879
bd238fb4
LI		 1880 P9_DPRINTK(P9_DEBUG_VFS,
1881 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
2bad8471
EVH		 1882 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1883
531b1094
LI		 1884 if (!new_valid_dev(rdev))
1885 return -EINVAL;
2bad8471 1886
531b1094 1887 name = __getname();
c0291a05
ET		 1888 if (!name)
1889 return -ENOMEM;
2bad8471
EVH		 1890 /* build extension */
1891 if (S_ISBLK(mode))
531b1094 1892 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
2bad8471 1893 else if (S_ISCHR(mode))
531b1094 1894 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
73c592b9 1895 else if (S_ISFIFO(mode))
531b1094 1896 *name = 0;
75cc5c9b
VJ		 1897 else if (S_ISSOCK(mode))
1898 *name = 0;
2bad8471 1899 else {
531b1094
LI		 1900 __putname(name);
1901 return -EINVAL;
2bad8471
EVH		 1902 }
1903
531b1094
LI		 1904 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1905 __putname(name);
2bad8471
EVH		 1906
1907 return retval;
1908}
1909
4b43516a
MK		 1910/**
1911 * v9fs_vfs_mknod_dotl - create a special file
1912 * @dir: inode destination for new link
1913 * @dentry: dentry for file
1914 * @mode: mode for creation
1915 * @rdev: device associated with special file
1916 *
1917 */
1918static int
ad77dbce 1919v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
4b43516a
MK		 1920 dev_t rdev)
1921{
1922 int err;
1923 char *name;
ad77dbce 1924 mode_t mode;
4b43516a
MK		 1925 struct v9fs_session_info *v9ses;
1926 struct p9_fid *fid = NULL, *dfid = NULL;
1927 struct inode *inode;
1928 gid_t gid;
1929 struct p9_qid qid;
01a622bd 1930 struct dentry *dir_dentry;
ad77dbce 1931 struct posix_acl *dacl = NULL, *pacl = NULL;
4b43516a
MK		 1932
1933 P9_DPRINTK(P9_DEBUG_VFS,
1934 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
ad77dbce 1935 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
4b43516a
MK		 1936
1937 if (!new_valid_dev(rdev))
1938 return -EINVAL;
1939
1940 v9ses = v9fs_inode2v9ses(dir);
1941 dir_dentry = v9fs_dentry_from_dir_inode(dir);
01a622bd 1942 dfid = v9fs_fid_lookup(dir_dentry);
4b43516a
MK		 1943 if (IS_ERR(dfid)) {
1944 err = PTR_ERR(dfid);
1945 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
1946 dfid = NULL;
1947 goto error;
1948 }
1949
1950 gid = v9fs_get_fsgid_for_create(dir);
ad77dbce
AK		 1951 mode = omode;
1952 /* Update mode based on ACL value */
1953 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
1954 if (err) {
1955 P9_DPRINTK(P9_DEBUG_VFS,
1956 "Failed to get acl values in mknod %d\n", err);
1957 goto error;
1958 }
4b43516a
MK		 1959 name = (char *) dentry->d_name.name;
1960
1961 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
1962 if (err < 0)
1963 goto error;
1964
1965 /* instantiate inode and assign the unopened fid to the dentry */
1966 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
1967 fid = p9_client_walk(dfid, 1, &name, 1);
1968 if (IS_ERR(fid)) {
1969 err = PTR_ERR(fid);
1970 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
1971 err);
1972 fid = NULL;
1973 goto error;
1974 }
1975
1976 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
1977 if (IS_ERR(inode)) {
1978 err = PTR_ERR(inode);
1979 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
1980 err);
1981 goto error;
1982 }
fb045adb 1983 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
4b43516a
MK		 1984 d_instantiate(dentry, inode);
1985 err = v9fs_fid_add(dentry, fid);
1986 if (err < 0)
1987 goto error;
1988 fid = NULL;
1989 } else {
1990 /*
1991 * Not in cached mode. No need to populate inode with stat.
1992 * socket syscall returns a fd, so we need instantiate
1993 */
1994 inode = v9fs_get_inode(dir->i_sb, mode);
1995 if (IS_ERR(inode)) {
1996 err = PTR_ERR(inode);
1997 goto error;
1998 }
fb045adb 1999 d_set_d_op(dentry, &v9fs_dentry_operations);
4b43516a
MK		 2000 d_instantiate(dentry, inode);
2001 }
ad77dbce
AK		 2002 /* Now set the ACL based on the default value */
2003 v9fs_set_create_acl(dentry, dacl, pacl);
4b43516a
MK		 2004error:
2005 if (fid)
2006 p9_client_clunk(fid);
2007 return err;
2008}
2009
329176cc
MK		 2010static int
2011v9fs_vfs_readlink_dotl(struct dentry *dentry, char *buffer, int buflen)
2012{
2013 int retval;
2014 struct p9_fid *fid;
2015 char *target = NULL;
2016
2017 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
2018 retval = -EPERM;
2019 fid = v9fs_fid_lookup(dentry);
2020 if (IS_ERR(fid))
2021 return PTR_ERR(fid);
2022
2023 retval = p9_client_readlink(fid, &target);
2024 if (retval < 0)
2025 return retval;
2026
2027 strncpy(buffer, target, buflen);
2028 P9_DPRINTK(P9_DEBUG_VFS, "%s -> %s\n", dentry->d_name.name, buffer);
2029
2030 retval = strnlen(buffer, buflen);
2031 return retval;
2032}
2033
2034/**
2035 * v9fs_vfs_follow_link_dotl - follow a symlink path
2036 * @dentry: dentry for symlink
2037 * @nd: nameidata
2038 *
2039 */
2040
2041static void *
2042v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
2043{
2044 int len = 0;
2045 char *link = __getname();
2046
2047 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
2048
2049 if (!link)
2050 link = ERR_PTR(-ENOMEM);
2051 else {
2052 len = v9fs_vfs_readlink_dotl(dentry, link, PATH_MAX);
2053 if (len < 0) {
2054 __putname(link);
2055 link = ERR_PTR(len);
2056 } else
2057 link[min(len, PATH_MAX-1)] = 0;
2058 }
2059 nd_set_link(nd, link);
2060
2061 return NULL;
2062}
2063
9b6533c9
SK		 2064static const struct inode_operations v9fs_dir_inode_operations_dotu = {
2065 .create = v9fs_vfs_create,
2066 .lookup = v9fs_vfs_lookup,
2067 .symlink = v9fs_vfs_symlink,
50cc42ff 2068 .link = v9fs_vfs_link,
9b6533c9
SK		 2069 .unlink = v9fs_vfs_unlink,
2070 .mkdir = v9fs_vfs_mkdir,
2071 .rmdir = v9fs_vfs_rmdir,
1d76e313 2072 .mknod = v9fs_vfs_mknod,
9b6533c9
SK		 2073 .rename = v9fs_vfs_rename,
2074 .getattr = v9fs_vfs_getattr,
2075 .setattr = v9fs_vfs_setattr,
2076};
2077
2078static const struct inode_operations v9fs_dir_inode_operations_dotl = {
5643135a 2079 .create = v9fs_vfs_create_dotl,
2bad8471 2080 .lookup = v9fs_vfs_lookup,
50cc42ff
VJJ		 2081 .link = v9fs_vfs_link_dotl,
2082 .symlink = v9fs_vfs_symlink_dotl,
2bad8471 2083 .unlink = v9fs_vfs_unlink,
01a622bd 2084 .mkdir = v9fs_vfs_mkdir_dotl,
2bad8471 2085 .rmdir = v9fs_vfs_rmdir,
4b43516a 2086 .mknod = v9fs_vfs_mknod_dotl,
2bad8471 2087 .rename = v9fs_vfs_rename,
f0853122 2088 .getattr = v9fs_vfs_getattr_dotl,
87d7845a 2089 .setattr = v9fs_vfs_setattr_dotl,
ebf46264
AK		 2090 .setxattr = generic_setxattr,
2091 .getxattr = generic_getxattr,
2092 .removexattr = generic_removexattr,
2093 .listxattr = v9fs_listxattr,
85ff872d 2094 .check_acl = v9fs_check_acl,
2bad8471
EVH		 2095};
2096
754661f1 2097static const struct inode_operations v9fs_dir_inode_operations = {
b501611a
EVH		 2098 .create = v9fs_vfs_create,
2099 .lookup = v9fs_vfs_lookup,
2100 .unlink = v9fs_vfs_unlink,
2101 .mkdir = v9fs_vfs_mkdir,
2102 .rmdir = v9fs_vfs_rmdir,
2103 .mknod = v9fs_vfs_mknod,
2104 .rename = v9fs_vfs_rename,
2105 .getattr = v9fs_vfs_getattr,
2106 .setattr = v9fs_vfs_setattr,
2107};
2108
754661f1 2109static const struct inode_operations v9fs_file_inode_operations = {
2bad8471
EVH		 2110 .getattr = v9fs_vfs_getattr,
2111 .setattr = v9fs_vfs_setattr,
2112};
2113
9b6533c9 2114static const struct inode_operations v9fs_file_inode_operations_dotl = {
f0853122 2115 .getattr = v9fs_vfs_getattr_dotl,
87d7845a 2116 .setattr = v9fs_vfs_setattr_dotl,
ebf46264
AK		 2117 .setxattr = generic_setxattr,
2118 .getxattr = generic_getxattr,
2119 .removexattr = generic_removexattr,
2120 .listxattr = v9fs_listxattr,
85ff872d 2121 .check_acl = v9fs_check_acl,
9b6533c9
SK		 2122};
2123
754661f1 2124static const struct inode_operations v9fs_symlink_inode_operations = {
204f2f0e 2125 .readlink = generic_readlink,
2bad8471
EVH		 2126 .follow_link = v9fs_vfs_follow_link,
2127 .put_link = v9fs_vfs_put_link,
2128 .getattr = v9fs_vfs_getattr,
2129 .setattr = v9fs_vfs_setattr,
2130};
9b6533c9
SK		 2131
2132static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
329176cc
MK		 2133 .readlink = v9fs_vfs_readlink_dotl,
2134 .follow_link = v9fs_vfs_follow_link_dotl,
9b6533c9 2135 .put_link = v9fs_vfs_put_link,
f0853122 2136 .getattr = v9fs_vfs_getattr_dotl,
87d7845a 2137 .setattr = v9fs_vfs_setattr_dotl,
ebf46264
AK		 2138 .setxattr = generic_setxattr,
2139 .getxattr = generic_getxattr,
2140 .removexattr = generic_removexattr,
2141 .listxattr = v9fs_listxattr,
9b6533c9 2142};
Linux 6.x block layer and io_uring tree(s)