vfs_inode.c 33.4 KB
Newer Older
1 2 3
/*
 *  linux/fs/9p/vfs_inode.c
 *
4
 * This file contains vfs inode ops for the 9P2000 protocol.
5 6 7 8 9
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
10 11
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/pagemap.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/inet.h>
#include <linux/namei.h>
#include <linux/idr.h>
A
Alexey Dobriyan 已提交
36
#include <linux/sched.h>
37
#include <linux/slab.h>
38
#include <linux/xattr.h>
39
#include <linux/posix_acl.h>
40 41
#include <net/9p/9p.h>
#include <net/9p/client.h>
42 43 44 45

#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"
46
#include "cache.h"
47
#include "xattr.h"
48
#include "acl.h"
49

50
static const struct inode_operations v9fs_dir_inode_operations;
51
static const struct inode_operations v9fs_dir_inode_operations_dotu;
52 53
static const struct inode_operations v9fs_file_inode_operations;
static const struct inode_operations v9fs_symlink_inode_operations;
54

55 56 57 58 59 60 61
/**
 * unixmode2p9mode - convert unix mode bits to plan 9
 * @v9ses: v9fs session information
 * @mode: mode to convert
 *
 */

62
static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
63 64 65 66
{
	int res;
	res = mode & 0777;
	if (S_ISDIR(mode))
67
		res |= P9_DMDIR;
68
	if (v9fs_proto_dotu(v9ses)) {
69
		if (S_ISLNK(mode))
70
			res |= P9_DMSYMLINK;
71 72
		if (v9ses->nodev == 0) {
			if (S_ISSOCK(mode))
73
				res |= P9_DMSOCKET;
74
			if (S_ISFIFO(mode))
75
				res |= P9_DMNAMEDPIPE;
76
			if (S_ISBLK(mode))
77
				res |= P9_DMDEVICE;
78
			if (S_ISCHR(mode))
79
				res |= P9_DMDEVICE;
80 81 82
		}

		if ((mode & S_ISUID) == S_ISUID)
83
			res |= P9_DMSETUID;
84
		if ((mode & S_ISGID) == S_ISGID)
85
			res |= P9_DMSETGID;
A
Anthony Liguori 已提交
86 87
		if ((mode & S_ISVTX) == S_ISVTX)
			res |= P9_DMSETVTX;
88 89
		if ((mode & P9_DMLINK))
			res |= P9_DMLINK;
90 91 92 93 94 95 96 97
	}

	return res;
}

/**
 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
 * @v9ses: v9fs session information
98 99
 * @stat: p9_wstat from which mode need to be derived
 * @rdev: major number, minor number in case of device files.
100 101
 *
 */
102 103
static int p9mode2unixmode(struct v9fs_session_info *v9ses,
			   struct p9_wstat *stat, dev_t *rdev)
104 105
{
	int res;
106
	int mode = stat->mode;
107

108 109
	res = mode & S_IALLUGO;
	*rdev = 0;
110

111
	if ((mode & P9_DMDIR) == P9_DMDIR)
112
		res |= S_IFDIR;
113
	else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
114
		res |= S_IFLNK;
115
	else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
116 117
		 && (v9ses->nodev == 0))
		res |= S_IFSOCK;
118
	else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
119 120
		 && (v9ses->nodev == 0))
		res |= S_IFIFO;
121
	else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141
		 && (v9ses->nodev == 0)) {
		char type = 0, ext[32];
		int major = -1, minor = -1;

		strncpy(ext, stat->extension, sizeof(ext));
		sscanf(ext, "%c %u %u", &type, &major, &minor);
		switch (type) {
		case 'c':
			res |= S_IFCHR;
			break;
		case 'b':
			res |= S_IFBLK;
			break;
		default:
			P9_DPRINTK(P9_DEBUG_ERROR,
				"Unknown special type %c %s\n", type,
				stat->extension);
		};
		*rdev = MKDEV(major, minor);
	} else
142 143
		res |= S_IFREG;

144
	if (v9fs_proto_dotu(v9ses)) {
145
		if ((mode & P9_DMSETUID) == P9_DMSETUID)
146 147
			res |= S_ISUID;

148
		if ((mode & P9_DMSETGID) == P9_DMSETGID)
149
			res |= S_ISGID;
A
Anthony Liguori 已提交
150 151 152

		if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
			res |= S_ISVTX;
153 154 155 156
	}
	return res;
}

E
Eric Van Hensbergen 已提交
157 158 159
/**
 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
 * @uflags: flags to convert
160
 * @extended: if .u extensions are active
E
Eric Van Hensbergen 已提交
161 162
 */

163
int v9fs_uflags2omode(int uflags, int extended)
164 165 166 167 168 169 170
{
	int ret;

	ret = 0;
	switch (uflags&3) {
	default:
	case O_RDONLY:
171
		ret = P9_OREAD;
172 173 174
		break;

	case O_WRONLY:
175
		ret = P9_OWRITE;
176 177 178
		break;

	case O_RDWR:
179
		ret = P9_ORDWR;
180 181 182 183
		break;
	}

	if (uflags & O_TRUNC)
184
		ret |= P9_OTRUNC;
185

186 187 188 189 190 191 192
	if (extended) {
		if (uflags & O_EXCL)
			ret |= P9_OEXCL;

		if (uflags & O_APPEND)
			ret |= P9_OAPPEND;
	}
193 194 195 196

	return ret;
}

197
/**
198 199
 * v9fs_blank_wstat - helper function to setup a 9P stat structure
 * @wstat: structure to initialize
200 201 202
 *
 */

203
void
204
v9fs_blank_wstat(struct p9_wstat *wstat)
205
{
206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222
	wstat->type = ~0;
	wstat->dev = ~0;
	wstat->qid.type = ~0;
	wstat->qid.version = ~0;
	*((long long *)&wstat->qid.path) = ~0;
	wstat->mode = ~0;
	wstat->atime = ~0;
	wstat->mtime = ~0;
	wstat->length = ~0;
	wstat->name = NULL;
	wstat->uid = NULL;
	wstat->gid = NULL;
	wstat->muid = NULL;
	wstat->n_uid = ~0;
	wstat->n_gid = ~0;
	wstat->n_muid = ~0;
	wstat->extension = NULL;
223 224
}

225 226 227 228 229 230
/**
 * v9fs_alloc_inode - helper function to allocate an inode
 *
 */
struct inode *v9fs_alloc_inode(struct super_block *sb)
{
A
Aneesh Kumar K.V 已提交
231 232 233 234
	struct v9fs_inode *v9inode;
	v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache,
							GFP_KERNEL);
	if (!v9inode)
235
		return NULL;
A
Aneesh Kumar K.V 已提交
236 237 238 239
#ifdef CONFIG_9P_FSCACHE
	v9inode->fscache = NULL;
	spin_lock_init(&v9inode->fscache_lock);
#endif
240
	v9inode->writeback_fid = NULL;
241
	v9inode->cache_validity = 0;
242
	mutex_init(&v9inode->v_mutex);
A
Aneesh Kumar K.V 已提交
243
	return &v9inode->vfs_inode;
244 245 246 247 248 249 250
}

/**
 * v9fs_destroy_inode - destroy an inode
 *
 */

N
Nick Piggin 已提交
251
static void v9fs_i_callback(struct rcu_head *head)
252
{
N
Nick Piggin 已提交
253 254
	struct inode *inode = container_of(head, struct inode, i_rcu);
	INIT_LIST_HEAD(&inode->i_dentry);
A
Aneesh Kumar K.V 已提交
255
	kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
256
}
N
Nick Piggin 已提交
257 258 259 260 261

void v9fs_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, v9fs_i_callback);
}
262

A
Aneesh Kumar K.V 已提交
263
int v9fs_init_inode(struct v9fs_session_info *v9ses,
264
		    struct inode *inode, int mode, dev_t rdev)
265
{
A
Aneesh Kumar K.V 已提交
266
	int err = 0;
267

268
	inode_init_owner(inode, NULL, mode);
269
	inode->i_blocks = 0;
270
	inode->i_rdev = rdev;
271 272 273 274 275 276 277 278
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	inode->i_mapping->a_ops = &v9fs_addr_operations;

	switch (mode & S_IFMT) {
	case S_IFIFO:
	case S_IFBLK:
	case S_IFCHR:
	case S_IFSOCK:
M
M. Mohan Kumar 已提交
279 280 281 282 283
		if (v9fs_proto_dotl(v9ses)) {
			inode->i_op = &v9fs_file_inode_operations_dotl;
		} else if (v9fs_proto_dotu(v9ses)) {
			inode->i_op = &v9fs_file_inode_operations;
		} else {
284
			P9_DPRINTK(P9_DEBUG_ERROR,
285 286 287
				   "special files without extended mode\n");
			err = -EINVAL;
			goto error;
288
		}
289 290 291
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
		break;
	case S_IFREG:
292 293
		if (v9fs_proto_dotl(v9ses)) {
			inode->i_op = &v9fs_file_inode_operations_dotl;
294 295 296 297 298
			if (v9ses->cache)
				inode->i_fop =
					&v9fs_cached_file_operations_dotl;
			else
				inode->i_fop = &v9fs_file_operations_dotl;
299 300
		} else {
			inode->i_op = &v9fs_file_inode_operations;
301 302 303 304
			if (v9ses->cache)
				inode->i_fop = &v9fs_cached_file_operations;
			else
				inode->i_fop = &v9fs_file_operations;
305 306
		}

307 308
		break;
	case S_IFLNK:
309 310 311
		if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
			P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with "
						"legacy protocol.\n");
312 313 314
			err = -EINVAL;
			goto error;
		}
315 316 317 318 319 320

		if (v9fs_proto_dotl(v9ses))
			inode->i_op = &v9fs_symlink_inode_operations_dotl;
		else
			inode->i_op = &v9fs_symlink_inode_operations;

321 322 323
		break;
	case S_IFDIR:
		inc_nlink(inode);
324 325 326 327
		if (v9fs_proto_dotl(v9ses))
			inode->i_op = &v9fs_dir_inode_operations_dotl;
		else if (v9fs_proto_dotu(v9ses))
			inode->i_op = &v9fs_dir_inode_operations_dotu;
328 329
		else
			inode->i_op = &v9fs_dir_inode_operations;
330 331 332 333 334 335

		if (v9fs_proto_dotl(v9ses))
			inode->i_fop = &v9fs_dir_operations_dotl;
		else
			inode->i_fop = &v9fs_dir_operations;

336 337 338 339 340 341
		break;
	default:
		P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
			   mode, mode & S_IFMT);
		err = -EINVAL;
		goto error;
342
	}
A
Aneesh Kumar K.V 已提交
343 344
error:
	return err;
345

A
Aneesh Kumar K.V 已提交
346
}
347

A
Aneesh Kumar K.V 已提交
348 349 350 351 352 353 354
/**
 * v9fs_get_inode - helper function to setup an inode
 * @sb: superblock
 * @mode: mode to setup inode with
 *
 */

355
struct inode *v9fs_get_inode(struct super_block *sb, int mode, dev_t rdev)
A
Aneesh Kumar K.V 已提交
356 357 358 359 360 361 362 363 364 365 366 367
{
	int err;
	struct inode *inode;
	struct v9fs_session_info *v9ses = sb->s_fs_info;

	P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);

	inode = new_inode(sb);
	if (!inode) {
		P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
		return ERR_PTR(-ENOMEM);
	}
368
	err = v9fs_init_inode(v9ses, inode, mode, rdev);
A
Aneesh Kumar K.V 已提交
369 370 371 372 373
	if (err) {
		iput(inode);
		return ERR_PTR(err);
	}
	return inode;
374 375
}

376
/*
377 378 379 380
static struct v9fs_fid*
v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
{
	int err;
381
	int nfid;
382 383 384 385 386
	struct v9fs_fid *ret;
	struct v9fs_fcall *fcall;

	nfid = v9fs_get_idpool(&v9ses->fidpool);
	if (nfid < 0) {
387
		eprintk(KERN_WARNING, "no free fids available\n");
388
		return ERR_PTR(-ENOSPC);
389 390
	}

391 392 393 394
	err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
		&fcall);

	if (err < 0) {
395 396 397
		if (fcall && fcall->id == RWALK)
			goto clunk_fid;

398 399 400
		PRINT_FCALL_ERROR("walk error", fcall);
		v9fs_put_idpool(nfid, &v9ses->fidpool);
		goto error;
401
	}
402

403 404
	kfree(fcall);
	fcall = NULL;
405 406 407 408 409
	ret = v9fs_fid_create(v9ses, nfid);
	if (!ret) {
		err = -ENOMEM;
		goto clunk_fid;
	}
410

411 412 413 414
	err = v9fs_fid_insert(ret, dentry);
	if (err < 0) {
		v9fs_fid_destroy(ret);
		goto clunk_fid;
415
	}
416

417
	return ret;
418

419 420
clunk_fid:
	v9fs_t_clunk(v9ses, nfid);
421

422 423 424 425
error:
	kfree(fcall);
	return ERR_PTR(err);
}
426
*/
427

428 429 430 431 432 433

/**
 * v9fs_clear_inode - release an inode
 * @inode: inode to release
 *
 */
434
void v9fs_evict_inode(struct inode *inode)
435
{
436 437
	struct v9fs_inode *v9inode = V9FS_I(inode);

438 439
	truncate_inode_pages(inode->i_mapping, 0);
	end_writeback(inode);
440 441 442 443 444
	filemap_fdatawrite(inode->i_mapping);

#ifdef CONFIG_9P_FSCACHE
	v9fs_cache_inode_put_cookie(inode);
#endif
445 446 447 448
	/* clunk the fid stashed in writeback_fid */
	if (v9inode->writeback_fid) {
		p9_client_clunk(v9inode->writeback_fid);
		v9inode->writeback_fid = NULL;
449
	}
450 451
}

452 453 454
static int v9fs_test_inode(struct inode *inode, void *data)
{
	int umode;
455
	dev_t rdev;
456 457 458 459
	struct v9fs_inode *v9inode = V9FS_I(inode);
	struct p9_wstat *st = (struct p9_wstat *)data;
	struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);

460
	umode = p9mode2unixmode(v9ses, st, &rdev);
461 462 463 464 465 466 467 468 469 470 471 472 473 474
	/* don't match inode of different type */
	if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
		return 0;

	/* compare qid details */
	if (memcmp(&v9inode->qid.version,
		   &st->qid.version, sizeof(v9inode->qid.version)))
		return 0;

	if (v9inode->qid.type != st->qid.type)
		return 0;
	return 1;
}

475 476 477 478 479
static int v9fs_test_new_inode(struct inode *inode, void *data)
{
	return 0;
}

480 481 482 483 484 485 486 487 488
static int v9fs_set_inode(struct inode *inode,  void *data)
{
	struct v9fs_inode *v9inode = V9FS_I(inode);
	struct p9_wstat *st = (struct p9_wstat *)data;

	memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
	return 0;
}

A
Aneesh Kumar K.V 已提交
489 490
static struct inode *v9fs_qid_iget(struct super_block *sb,
				   struct p9_qid *qid,
491 492
				   struct p9_wstat *st,
				   int new)
493
{
494
	dev_t rdev;
A
Aneesh Kumar K.V 已提交
495 496 497 498
	int retval, umode;
	unsigned long i_ino;
	struct inode *inode;
	struct v9fs_session_info *v9ses = sb->s_fs_info;
499 500 501 502 503 504
	int (*test)(struct inode *, void *);

	if (new)
		test = v9fs_test_new_inode;
	else
		test = v9fs_test_inode;
505

A
Aneesh Kumar K.V 已提交
506
	i_ino = v9fs_qid2ino(qid);
507
	inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
A
Aneesh Kumar K.V 已提交
508 509 510 511 512 513 514 515 516
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;
	/*
	 * initialize the inode with the stat info
	 * FIXME!! we may need support for stale inodes
	 * later.
	 */
517
	inode->i_ino = i_ino;
518 519
	umode = p9mode2unixmode(v9ses, st, &rdev);
	retval = v9fs_init_inode(v9ses, inode, umode, rdev);
A
Aneesh Kumar K.V 已提交
520
	if (retval)
521
		goto error;
522

A
Aneesh Kumar K.V 已提交
523
	v9fs_stat2inode(st, inode, sb);
524
#ifdef CONFIG_9P_FSCACHE
A
Aneesh Kumar K.V 已提交
525
	v9fs_cache_inode_get_cookie(inode);
526
#endif
A
Aneesh Kumar K.V 已提交
527 528
	unlock_new_inode(inode);
	return inode;
529
error:
A
Aneesh Kumar K.V 已提交
530 531 532 533 534 535 536
	unlock_new_inode(inode);
	iput(inode);
	return ERR_PTR(retval);

}

struct inode *
A
Aneesh Kumar K.V 已提交
537
v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
538
		    struct super_block *sb, int new)
A
Aneesh Kumar K.V 已提交
539 540 541 542 543 544 545 546
{
	struct p9_wstat *st;
	struct inode *inode = NULL;

	st = p9_client_stat(fid);
	if (IS_ERR(st))
		return ERR_CAST(st);

547
	inode = v9fs_qid_iget(sb, &st->qid, st, new);
548
	p9stat_free(st);
549
	kfree(st);
A
Aneesh Kumar K.V 已提交
550
	return inode;
551 552
}

553 554 555 556 557 558 559 560 561 562 563 564 565
/**
 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to
 * plan 9 AT flag.
 * @flags: flags to convert
 */
static int v9fs_at_to_dotl_flags(int flags)
{
	int rflags = 0;
	if (flags & AT_REMOVEDIR)
		rflags |= P9_DOTL_AT_REMOVEDIR;
	return rflags;
}

566 567
/**
 * v9fs_remove - helper function to remove files and directories
568
 * @dir: directory inode that is being deleted
569
 * @dentry:  dentry that is being deleted
570
 * @rmdir: removing a directory
571 572 573
 *
 */

574
static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
575
{
576 577 578 579
	struct inode *inode;
	int retval = -EOPNOTSUPP;
	struct p9_fid *v9fid, *dfid;
	struct v9fs_session_info *v9ses;
580

581 582
	P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
		   dir, dentry, flags);
583

584 585 586 587 588 589 590 591 592
	v9ses = v9fs_inode2v9ses(dir);
	inode = dentry->d_inode;
	dfid = v9fs_fid_lookup(dentry->d_parent);
	if (IS_ERR(dfid)) {
		retval = PTR_ERR(dfid);
		P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
		return retval;
	}
	if (v9fs_proto_dotl(v9ses))
593 594
		retval = p9_client_unlinkat(dfid, dentry->d_name.name,
					    v9fs_at_to_dotl_flags(flags));
595 596 597 598 599 600 601
	if (retval == -EOPNOTSUPP) {
		/* Try the one based on path */
		v9fid = v9fs_fid_clone(dentry);
		if (IS_ERR(v9fid))
			return PTR_ERR(v9fid);
		retval = p9_client_remove(v9fid);
	}
602 603 604 605 606
	if (!retval) {
		/*
		 * directories on unlink should have zero
		 * link count
		 */
607 608
		if (flags & AT_REMOVEDIR) {
			clear_nlink(inode);
609 610
			drop_nlink(dir);
		} else
611
			drop_nlink(inode);
612

613
		v9fs_invalidate_inode_attr(inode);
614
		v9fs_invalidate_inode_attr(dir);
615
	}
A
Aneesh Kumar K.V 已提交
616
	return retval;
617 618 619
}

/**
620
 * v9fs_create - Create a file
E
Eric Van Hensbergen 已提交
621 622
 * @v9ses: session information
 * @dir: directory that dentry is being created in
623
 * @dentry:  dentry that is being created
A
Abhishek Kulkarni 已提交
624
 * @extension: 9p2000.u extension string to support devices, etc.
625 626
 * @perm: create permissions
 * @mode: open mode
627 628
 *
 */
629 630 631
static struct p9_fid *
v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
		struct dentry *dentry, char *extension, u32 perm, u8 mode)
632
{
633
	int err;
634 635
	char *name;
	struct p9_fid *dfid, *ofid, *fid;
636 637
	struct inode *inode;

638 639
	P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);

640 641 642 643
	err = 0;
	ofid = NULL;
	fid = NULL;
	name = (char *) dentry->d_name.name;
644
	dfid = v9fs_fid_lookup(dentry->d_parent);
L
Latchesar Ionkov 已提交
645
	if (IS_ERR(dfid)) {
646
		err = PTR_ERR(dfid);
647 648
		P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
		return ERR_PTR(err);
649
	}
650

651 652 653 654
	/* clone a fid to use for creation */
	ofid = p9_client_walk(dfid, 0, NULL, 1);
	if (IS_ERR(ofid)) {
		err = PTR_ERR(ofid);
655
		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
656
		return ERR_PTR(err);
657
	}
658

659
	err = p9_client_fcreate(ofid, name, perm, mode, extension);
660 661
	if (err < 0) {
		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
662
		goto error;
663
	}
664

665
	/* now walk from the parent so we can get unopened fid */
666
	fid = p9_client_walk(dfid, 1, &name, 1);
667 668
	if (IS_ERR(fid)) {
		err = PTR_ERR(fid);
669
		P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
670
		fid = NULL;
671
		goto error;
672
	}
673

674
	/* instantiate inode and assign the unopened fid to the dentry */
675
	inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
676 677
	if (IS_ERR(inode)) {
		err = PTR_ERR(inode);
678
		P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
679 680
		goto error;
	}
681 682 683
	err = v9fs_fid_add(dentry, fid);
	if (err < 0)
		goto error;
684
	d_instantiate(dentry, inode);
685 686 687 688 689 690 691 692 693 694 695 696 697
	return ofid;
error:
	if (ofid)
		p9_client_clunk(ofid);

	if (fid)
		p9_client_clunk(fid);

	return ERR_PTR(err);
}

/**
 * v9fs_vfs_create - VFS hook to create files
E
Eric Van Hensbergen 已提交
698
 * @dir: directory inode that is being created
699 700 701 702 703
 * @dentry:  dentry that is being deleted
 * @mode: create permissions
 * @nd: path information
 *
 */
704

705 706 707 708 709 710 711
static int
v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
		struct nameidata *nd)
{
	int err;
	u32 perm;
	int flags;
712 713
	struct file *filp;
	struct v9fs_inode *v9inode;
714
	struct v9fs_session_info *v9ses;
715
	struct p9_fid *fid, *inode_fid;
716 717 718 719 720

	err = 0;
	fid = NULL;
	v9ses = v9fs_inode2v9ses(dir);
	perm = unixmode2p9mode(v9ses, mode);
721
	if (nd)
722
		flags = nd->intent.open.flags;
723 724 725 726
	else
		flags = O_RDWR;

	fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
727 728
				v9fs_uflags2omode(flags,
						v9fs_proto_dotu(v9ses)));
729 730 731 732 733 734
	if (IS_ERR(fid)) {
		err = PTR_ERR(fid);
		fid = NULL;
		goto error;
	}

735
	v9fs_invalidate_inode_attr(dir);
736
	/* if we are opening a file, assign the open fid to the file */
737
	if (nd) {
738
		v9inode = V9FS_I(dentry->d_inode);
739
		mutex_lock(&v9inode->v_mutex);
740 741
		if (v9ses->cache && !v9inode->writeback_fid &&
		    ((flags & O_ACCMODE) != O_RDONLY)) {
742
			/*
743
			 * clone a fid and add it to writeback_fid
744 745 746 747 748 749 750 751
			 * we do it during open time instead of
			 * page dirty time via write_begin/page_mkwrite
			 * because we want write after unlink usecase
			 * to work.
			 */
			inode_fid = v9fs_writeback_fid(dentry);
			if (IS_ERR(inode_fid)) {
				err = PTR_ERR(inode_fid);
752
				mutex_unlock(&v9inode->v_mutex);
753 754
				goto error;
			}
755
			v9inode->writeback_fid = (void *) inode_fid;
756
		}
757
		mutex_unlock(&v9inode->v_mutex);
758
		filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
759
		if (IS_ERR(filp)) {
760 761
			err = PTR_ERR(filp);
			goto error;
762 763
		}

764
		filp->private_data = fid;
765 766 767 768
#ifdef CONFIG_9P_FSCACHE
		if (v9ses->cache)
			v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
#endif
769 770
	} else
		p9_client_clunk(fid);
771 772 773 774

	return 0;

error:
775 776
	if (fid)
		p9_client_clunk(fid);
777 778

	return err;
779 780 781 782
}

/**
 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
E
Eric Van Hensbergen 已提交
783
 * @dir:  inode that is being unlinked
784 785 786 787 788
 * @dentry: dentry that is being unlinked
 * @mode: mode for new directory
 *
 */

789
static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
790
{
791
	int err;
792 793
	u32 perm;
	struct p9_fid *fid;
794
	struct v9fs_session_info *v9ses;
795

796 797
	P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
	err = 0;
798 799
	v9ses = v9fs_inode2v9ses(dir);
	perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
800 801 802 803
	fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
	if (IS_ERR(fid)) {
		err = PTR_ERR(fid);
		fid = NULL;
804
	} else {
805
		inc_nlink(dir);
806 807
		v9fs_invalidate_inode_attr(dir);
	}
808

809 810
	if (fid)
		p9_client_clunk(fid);
811 812

	return err;
813 814 815 816 817 818 819 820 821 822
}

/**
 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
 * @dir:  inode that is being walked from
 * @dentry: dentry that is being walked to?
 * @nameidata: path data
 *
 */

823
struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
824 825
				      struct nameidata *nameidata)
{
826
	struct dentry *res;
827 828
	struct super_block *sb;
	struct v9fs_session_info *v9ses;
829
	struct p9_fid *dfid, *fid;
830
	struct inode *inode;
831
	char *name;
832 833
	int result = 0;

834
	P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
835
		dir, dentry->d_name.name, dentry, nameidata);
836

837 838 839
	if (dentry->d_name.len > NAME_MAX)
		return ERR_PTR(-ENAMETOOLONG);

840 841
	sb = dir->i_sb;
	v9ses = v9fs_inode2v9ses(dir);
842
	/* We can walk d_parent because we hold the dir->i_mutex */
843 844
	dfid = v9fs_fid_lookup(dentry->d_parent);
	if (IS_ERR(dfid))
845
		return ERR_CAST(dfid);
846 847 848 849 850

	name = (char *) dentry->d_name.name;
	fid = p9_client_walk(dfid, 1, &name, 1);
	if (IS_ERR(fid)) {
		result = PTR_ERR(fid);
851
		if (result == -ENOENT) {
852 853
			inode = NULL;
			goto inst_out;
854 855
		}

856
		return ERR_PTR(result);
857
	}
858 859 860 861 862 863 864 865 866
	/*
	 * Make sure we don't use a wrong inode due to parallel
	 * unlink. For cached mode create calls request for new
	 * inode. But with cache disabled, lookup should do this.
	 */
	if (v9ses->cache)
		inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
	else
		inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
867 868 869 870
	if (IS_ERR(inode)) {
		result = PTR_ERR(inode);
		inode = NULL;
		goto error;
871
	}
872
	result = v9fs_fid_add(dentry, fid);
873
	if (result < 0)
874
		goto error_iput;
875
inst_out:
876 877 878 879 880 881 882 883 884 885 886
	/*
	 * If we had a rename on the server and a parallel lookup
	 * for the new name, then make sure we instantiate with
	 * the new name. ie look up for a/b, while on server somebody
	 * moved b under k and client parallely did a lookup for
	 * k/b.
	 */
	res = d_materialise_unique(dentry, inode);
	if (!IS_ERR(res))
		return res;
	result = PTR_ERR(res);
887 888
error_iput:
	iput(inode);
889
error:
890
	p9_client_clunk(fid);
891

892 893 894 895 896 897
	return ERR_PTR(result);
}

/**
 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
 * @i:  inode that is being unlinked
898
 * @d: dentry that is being unlinked
899 900 901
 *
 */

902
int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
903 904 905 906 907 908 909
{
	return v9fs_remove(i, d, 0);
}

/**
 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
 * @i:  inode that is being unlinked
910
 * @d: dentry that is being unlinked
911 912 913
 *
 */

914
int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
915
{
916
	return v9fs_remove(i, d, AT_REMOVEDIR);
917 918 919 920 921 922 923 924 925 926 927
}

/**
 * v9fs_vfs_rename - VFS hook to rename an inode
 * @old_dir:  old dir inode
 * @old_dentry: old dentry
 * @new_dir: new dir inode
 * @new_dentry: new dentry
 *
 */

928
int
929 930 931
v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
		struct inode *new_dir, struct dentry *new_dentry)
{
932
	int retval;
933
	struct inode *old_inode;
934
	struct inode *new_inode;
935 936 937 938 939
	struct v9fs_session_info *v9ses;
	struct p9_fid *oldfid;
	struct p9_fid *olddirfid;
	struct p9_fid *newdirfid;
	struct p9_wstat wstat;
940

941 942 943
	P9_DPRINTK(P9_DEBUG_VFS, "\n");
	retval = 0;
	old_inode = old_dentry->d_inode;
944
	new_inode = new_dentry->d_inode;
945 946
	v9ses = v9fs_inode2v9ses(old_inode);
	oldfid = v9fs_fid_lookup(old_dentry);
L
Latchesar Ionkov 已提交
947
	if (IS_ERR(oldfid))
948 949 950
		return PTR_ERR(oldfid);

	olddirfid = v9fs_fid_clone(old_dentry->d_parent);
L
Latchesar Ionkov 已提交
951
	if (IS_ERR(olddirfid)) {
952
		retval = PTR_ERR(olddirfid);
953
		goto done;
954 955 956
	}

	newdirfid = v9fs_fid_clone(new_dentry->d_parent);
L
Latchesar Ionkov 已提交
957
	if (IS_ERR(newdirfid)) {
958
		retval = PTR_ERR(newdirfid);
959
		goto clunk_olddir;
960 961
	}

962
	down_write(&v9ses->rename_sem);
963
	if (v9fs_proto_dotl(v9ses)) {
964 965 966 967 968 969
		retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
					    newdirfid, new_dentry->d_name.name);
		if (retval == -EOPNOTSUPP)
			retval = p9_client_rename(oldfid, newdirfid,
						  new_dentry->d_name.name);
		if (retval != -EOPNOTSUPP)
970 971
			goto clunk_newdir;
	}
972 973 974 975
	if (old_dentry->d_parent != new_dentry->d_parent) {
		/*
		 * 9P .u can only handle file rename in the same directory
		 */
976

977 978
		P9_DPRINTK(P9_DEBUG_ERROR,
				"old dir and new dir are different\n");
979
		retval = -EXDEV;
980
		goto clunk_newdir;
981
	}
982
	v9fs_blank_wstat(&wstat);
L
Latchesar Ionkov 已提交
983
	wstat.muid = v9ses->uname;
984
	wstat.name = (char *) new_dentry->d_name.name;
985
	retval = p9_client_wstat(oldfid, &wstat);
986

987
clunk_newdir:
988 989 990 991 992 993 994 995 996 997 998 999
	if (!retval) {
		if (new_inode) {
			if (S_ISDIR(new_inode->i_mode))
				clear_nlink(new_inode);
			else
				drop_nlink(new_inode);
		}
		if (S_ISDIR(old_inode->i_mode)) {
			if (!new_inode)
				inc_nlink(new_dir);
			drop_nlink(old_dir);
		}
1000
		v9fs_invalidate_inode_attr(old_inode);
1001 1002
		v9fs_invalidate_inode_attr(old_dir);
		v9fs_invalidate_inode_attr(new_dir);
1003

1004 1005
		/* successful rename */
		d_move(old_dentry, new_dentry);
1006
	}
1007
	up_write(&v9ses->rename_sem);
1008
	p9_client_clunk(newdirfid);
1009

1010
clunk_olddir:
1011
	p9_client_clunk(olddirfid);
1012

1013
done:
1014 1015 1016 1017
	return retval;
}

/**
A
Adrian Bunk 已提交
1018
 * v9fs_vfs_getattr - retrieve file metadata
E
Eric Van Hensbergen 已提交
1019 1020 1021
 * @mnt: mount information
 * @dentry: file to get attributes on
 * @stat: metadata structure to populate
1022 1023 1024 1025 1026 1027 1028
 *
 */

static int
v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
		 struct kstat *stat)
{
1029 1030 1031
	int err;
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid;
1032
	struct p9_wstat *st;
1033 1034 1035

	P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
	err = -EPERM;
A
Aneesh Kumar K.V 已提交
1036
	v9ses = v9fs_dentry2v9ses(dentry);
1037 1038 1039 1040
	if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
		generic_fillattr(dentry->d_inode, stat);
		return 0;
	}
1041 1042
	fid = v9fs_fid_lookup(dentry);
	if (IS_ERR(fid))
1043
		return PTR_ERR(fid);
1044

1045 1046 1047
	st = p9_client_stat(fid);
	if (IS_ERR(st))
		return PTR_ERR(st);
1048

1049
	v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
1050
	generic_fillattr(dentry->d_inode, stat);
1051

1052
	p9stat_free(st);
1053 1054
	kfree(st);
	return 0;
1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
}

/**
 * v9fs_vfs_setattr - set file metadata
 * @dentry: file whose metadata to set
 * @iattr: metadata assignment structure
 *
 */

static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
{
1066 1067 1068 1069
	int retval;
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid;
	struct p9_wstat wstat;
1070

1071
	P9_DPRINTK(P9_DEBUG_VFS, "\n");
1072 1073 1074 1075
	retval = inode_change_ok(dentry->d_inode, iattr);
	if (retval)
		return retval;

1076
	retval = -EPERM;
A
Aneesh Kumar K.V 已提交
1077
	v9ses = v9fs_dentry2v9ses(dentry);
1078
	fid = v9fs_fid_lookup(dentry);
1079 1080
	if(IS_ERR(fid))
		return PTR_ERR(fid);
1081

1082
	v9fs_blank_wstat(&wstat);
1083
	if (iattr->ia_valid & ATTR_MODE)
1084
		wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
1085 1086

	if (iattr->ia_valid & ATTR_MTIME)
1087
		wstat.mtime = iattr->ia_mtime.tv_sec;
1088 1089

	if (iattr->ia_valid & ATTR_ATIME)
1090
		wstat.atime = iattr->ia_atime.tv_sec;
1091 1092

	if (iattr->ia_valid & ATTR_SIZE)
1093
		wstat.length = iattr->ia_size;
1094

1095
	if (v9fs_proto_dotu(v9ses)) {
1096 1097
		if (iattr->ia_valid & ATTR_UID)
			wstat.n_uid = iattr->ia_uid;
1098

1099 1100
		if (iattr->ia_valid & ATTR_GID)
			wstat.n_gid = iattr->ia_gid;
1101
	}
1102

1103 1104 1105 1106
	/* Write all dirty data */
	if (S_ISREG(dentry->d_inode->i_mode))
		filemap_write_and_wait(dentry->d_inode->i_mapping);

1107 1108 1109
	retval = p9_client_wstat(fid, &wstat);
	if (retval < 0)
		return retval;
1110 1111 1112 1113 1114

	if ((iattr->ia_valid & ATTR_SIZE) &&
	    iattr->ia_size != i_size_read(dentry->d_inode))
		truncate_setsize(dentry->d_inode, iattr->ia_size);

1115
	v9fs_invalidate_inode_attr(dentry->d_inode);
1116

C
Christoph Hellwig 已提交
1117 1118 1119
	setattr_copy(dentry->d_inode, iattr);
	mark_inode_dirty(dentry->d_inode);
	return 0;
1120 1121 1122
}

/**
1123 1124
 * v9fs_stat2inode - populate an inode structure with mistat info
 * @stat: Plan 9 metadata (mistat) structure
1125 1126 1127 1128 1129 1130
 * @inode: inode to populate
 * @sb: superblock of filesystem
 *
 */

void
1131
v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
1132
	struct super_block *sb)
1133
{
1134
	mode_t mode;
1135
	char ext[32];
1136 1137
	char tag_name[14];
	unsigned int i_nlink;
1138
	struct v9fs_session_info *v9ses = sb->s_fs_info;
1139
	struct v9fs_inode *v9inode = V9FS_I(inode);
1140 1141 1142

	inode->i_nlink = 1;

1143 1144 1145
	inode->i_atime.tv_sec = stat->atime;
	inode->i_mtime.tv_sec = stat->mtime;
	inode->i_ctime.tv_sec = stat->mtime;
1146

1147 1148
	inode->i_uid = v9ses->dfltuid;
	inode->i_gid = v9ses->dfltgid;
1149

1150
	if (v9fs_proto_dotu(v9ses)) {
1151 1152
		inode->i_uid = stat->n_uid;
		inode->i_gid = stat->n_gid;
1153
	}
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
	if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
		if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
			/*
			 * Hadlink support got added later to
			 * to the .u extension. So there can be
			 * server out there that doesn't support
			 * this even with .u extension. So check
			 * for non NULL stat->extension
			 */
			strncpy(ext, stat->extension, sizeof(ext));
			/* HARDLINKCOUNT %u */
			sscanf(ext, "%13s %u", tag_name, &i_nlink);
			if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
				inode->i_nlink = i_nlink;
		}
	}
1170 1171 1172
	mode = stat->mode & S_IALLUGO;
	mode |= inode->i_mode & ~S_IALLUGO;
	inode->i_mode = mode;
1173
	i_size_write(inode, stat->length);
1174

1175
	/* not real number of blocks, but 512 byte ones ... */
1176
	inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9;
1177
	v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
1178 1179 1180 1181 1182 1183 1184 1185 1186
}

/**
 * v9fs_qid2ino - convert qid into inode number
 * @qid: qid to hash
 *
 * BUG: potential for inode number collisions?
 */

1187
ino_t v9fs_qid2ino(struct p9_qid *qid)
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202
{
	u64 path = qid->path + 2;
	ino_t i = 0;

	if (sizeof(ino_t) == sizeof(path))
		memcpy(&i, &path, sizeof(ino_t));
	else
		i = (ino_t) (path ^ (path >> 32));

	return i;
}

/**
 * v9fs_readlink - read a symlink's location (internal version)
 * @dentry: dentry for symlink
1203
 * @buffer: buffer to load symlink location into
1204 1205 1206 1207 1208 1209
 * @buflen: length of buffer
 *
 */

static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
{
1210
	int retval;
1211

1212 1213
	struct v9fs_session_info *v9ses;
	struct p9_fid *fid;
1214
	struct p9_wstat *st;
1215

1216 1217
	P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
	retval = -EPERM;
A
Aneesh Kumar K.V 已提交
1218
	v9ses = v9fs_dentry2v9ses(dentry);
1219
	fid = v9fs_fid_lookup(dentry);
L
Latchesar Ionkov 已提交
1220
	if (IS_ERR(fid))
1221
		return PTR_ERR(fid);
1222

1223
	if (!v9fs_proto_dotu(v9ses))
1224
		return -EBADF;
1225

1226 1227 1228
	st = p9_client_stat(fid);
	if (IS_ERR(st))
		return PTR_ERR(st);
1229

1230
	if (!(st->mode & P9_DMSYMLINK)) {
1231
		retval = -EINVAL;
1232
		goto done;
1233 1234 1235
	}

	/* copy extension buffer into buffer */
1236
	strncpy(buffer, st->extension, buflen);
1237

1238
	P9_DPRINTK(P9_DEBUG_VFS,
1239
		"%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer);
1240

M
Martin Stava 已提交
1241
	retval = strnlen(buffer, buflen);
1242
done:
1243
	p9stat_free(st);
1244
	kfree(st);
1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
	return retval;
}

/**
 * v9fs_vfs_follow_link - follow a symlink path
 * @dentry: dentry for symlink
 * @nd: nameidata
 *
 */

static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
{
	int len = 0;
	char *link = __getname();

1260
	P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
1261 1262 1263 1264

	if (!link)
		link = ERR_PTR(-ENOMEM);
	else {
1265
		len = v9fs_readlink(dentry, link, PATH_MAX);
1266 1267

		if (len < 0) {
1268
			__putname(link);
1269 1270
			link = ERR_PTR(len);
		} else
M
Martin Stava 已提交
1271
			link[min(len, PATH_MAX-1)] = 0;
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
	}
	nd_set_link(nd, link);

	return NULL;
}

/**
 * v9fs_vfs_put_link - release a symlink path
 * @dentry: dentry for symlink
 * @nd: nameidata
E
Eric Van Hensbergen 已提交
1282
 * @p: unused
1283 1284 1285
 *
 */

1286
void
E
Eric Van Hensbergen 已提交
1287
v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1288 1289 1290
{
	char *s = nd_get_link(nd);

1291 1292
	P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name,
		IS_ERR(s) ? "<error>" : s);
1293
	if (!IS_ERR(s))
1294
		__putname(s);
1295 1296
}

E
Eric Van Hensbergen 已提交
1297 1298 1299 1300 1301 1302 1303 1304 1305
/**
 * v9fs_vfs_mkspecial - create a special file
 * @dir: inode to create special file in
 * @dentry: dentry to create
 * @mode: mode to create special file
 * @extension: 9p2000.u format extension string representing special file
 *
 */

1306 1307
static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
	int mode, const char *extension)
1308
{
1309 1310
	u32 perm;
	struct p9_fid *fid;
1311
	struct v9fs_session_info *v9ses;
1312

1313
	v9ses = v9fs_inode2v9ses(dir);
1314
	if (!v9fs_proto_dotu(v9ses)) {
1315
		P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n");
1316
		return -EPERM;
1317 1318
	}

1319
	perm = unixmode2p9mode(v9ses, mode);
1320 1321 1322 1323
	fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
								P9_OREAD);
	if (IS_ERR(fid))
		return PTR_ERR(fid);
1324

1325
	v9fs_invalidate_inode_attr(dir);
1326
	p9_client_clunk(fid);
1327
	return 0;
1328 1329 1330 1331 1332 1333 1334 1335
}

/**
 * v9fs_vfs_symlink - helper function to create symlinks
 * @dir: directory inode containing symlink
 * @dentry: dentry for symlink
 * @symname: symlink data
 *
E
Eric Van Hensbergen 已提交
1336
 * See Also: 9P2000.u RFC for more information
1337 1338 1339 1340 1341 1342
 *
 */

static int
v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
1343 1344
	P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino,
					dentry->d_name.name, symname);
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362

	return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
}

/**
 * v9fs_vfs_link - create a hardlink
 * @old_dentry: dentry for file to link to
 * @dir: inode destination for new link
 * @dentry: dentry for link
 *
 */

static int
v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
	      struct dentry *dentry)
{
	int retval;
	char *name;
1363
	struct p9_fid *oldfid;
1364

1365 1366
	P9_DPRINTK(P9_DEBUG_VFS,
		" %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1367 1368
		old_dentry->d_name.name);

1369
	oldfid = v9fs_fid_clone(old_dentry);
L
Latchesar Ionkov 已提交
1370
	if (IS_ERR(oldfid))
1371
		return PTR_ERR(oldfid);
1372 1373

	name = __getname();
1374 1375 1376 1377
	if (unlikely(!name)) {
		retval = -ENOMEM;
		goto clunk_fid;
	}
1378

1379
	sprintf(name, "%d\n", oldfid->fid);
1380
	retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
1381
	__putname(name);
1382 1383
	if (!retval) {
		v9fs_refresh_inode(oldfid, old_dentry->d_inode);
1384
		v9fs_invalidate_inode_attr(dir);
1385
	}
1386
clunk_fid:
1387
	p9_client_clunk(oldfid);
1388 1389 1390 1391 1392 1393 1394 1395
	return retval;
}

/**
 * v9fs_vfs_mknod - create a special file
 * @dir: inode destination for new link
 * @dentry: dentry for file
 * @mode: mode for creation
E
Eric Van Hensbergen 已提交
1396
 * @rdev: device associated with special file
1397 1398 1399 1400 1401 1402
 *
 */

static int
v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
{
1403 1404
	int retval;
	char *name;
1405

1406 1407
	P9_DPRINTK(P9_DEBUG_VFS,
		" %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1408 1409
		dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));

1410 1411
	if (!new_valid_dev(rdev))
		return -EINVAL;
1412

1413
	name = __getname();
1414 1415
	if (!name)
		return -ENOMEM;
1416 1417
	/* build extension */
	if (S_ISBLK(mode))
1418
		sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
1419
	else if (S_ISCHR(mode))
1420
		sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
1421
	else if (S_ISFIFO(mode))
1422
		*name = 0;
V
Venkateswararao Jujjuri 已提交
1423 1424
	else if (S_ISSOCK(mode))
		*name = 0;
1425
	else {
1426 1427
		__putname(name);
		return -EINVAL;
1428 1429
	}

1430 1431
	retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
	__putname(name);
1432 1433 1434 1435

	return retval;
}

1436 1437
int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
{
1438 1439
	int umode;
	dev_t rdev;
1440 1441 1442 1443 1444 1445 1446 1447
	loff_t i_size;
	struct p9_wstat *st;
	struct v9fs_session_info *v9ses;

	v9ses = v9fs_inode2v9ses(inode);
	st = p9_client_stat(fid);
	if (IS_ERR(st))
		return PTR_ERR(st);
1448 1449 1450 1451 1452 1453
	/*
	 * Don't update inode if the file type is different
	 */
	umode = p9mode2unixmode(v9ses, st, &rdev);
	if ((inode->i_mode & S_IFMT) != (umode & S_IFMT))
		goto out;
1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464

	spin_lock(&inode->i_lock);
	/*
	 * We don't want to refresh inode->i_size,
	 * because we may have cached data
	 */
	i_size = inode->i_size;
	v9fs_stat2inode(st, inode, inode->i_sb);
	if (v9ses->cache)
		inode->i_size = i_size;
	spin_unlock(&inode->i_lock);
1465
out:
1466 1467 1468 1469 1470
	p9stat_free(st);
	kfree(st);
	return 0;
}

1471 1472 1473 1474
static const struct inode_operations v9fs_dir_inode_operations_dotu = {
	.create = v9fs_vfs_create,
	.lookup = v9fs_vfs_lookup,
	.symlink = v9fs_vfs_symlink,
1475
	.link = v9fs_vfs_link,
1476 1477 1478
	.unlink = v9fs_vfs_unlink,
	.mkdir = v9fs_vfs_mkdir,
	.rmdir = v9fs_vfs_rmdir,
1479
	.mknod = v9fs_vfs_mknod,
1480 1481 1482 1483 1484
	.rename = v9fs_vfs_rename,
	.getattr = v9fs_vfs_getattr,
	.setattr = v9fs_vfs_setattr,
};

1485
static const struct inode_operations v9fs_dir_inode_operations = {
1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496
	.create = v9fs_vfs_create,
	.lookup = v9fs_vfs_lookup,
	.unlink = v9fs_vfs_unlink,
	.mkdir = v9fs_vfs_mkdir,
	.rmdir = v9fs_vfs_rmdir,
	.mknod = v9fs_vfs_mknod,
	.rename = v9fs_vfs_rename,
	.getattr = v9fs_vfs_getattr,
	.setattr = v9fs_vfs_setattr,
};

1497
static const struct inode_operations v9fs_file_inode_operations = {
1498 1499 1500 1501
	.getattr = v9fs_vfs_getattr,
	.setattr = v9fs_vfs_setattr,
};

1502
static const struct inode_operations v9fs_symlink_inode_operations = {
A
Al Viro 已提交
1503
	.readlink = generic_readlink,
1504 1505 1506 1507 1508
	.follow_link = v9fs_vfs_follow_link,
	.put_link = v9fs_vfs_put_link,
	.getattr = v9fs_vfs_getattr,
	.setattr = v9fs_vfs_setattr,
};
1509