1
2/*
3 * SPU file system
4 *
5 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
6 *
7 * Author: Arnd Bergmann <arndb@de.ibm.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
12 * any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24#include <linux/file.h>
25#include <linux/fs.h>
26#include <linux/fsnotify.h>
27#include <linux/backing-dev.h>
28#include <linux/init.h>
29#include <linux/ioctl.h>
30#include <linux/module.h>
31#include <linux/mount.h>
32#include <linux/namei.h>
33#include <linux/pagemap.h>
34#include <linux/poll.h>
35#include <linux/slab.h>
36#include <linux/parser.h>
37
38#include <asm/prom.h>
39#include <asm/spu.h>
40#include <asm/spu_priv1.h>
41#include <asm/uaccess.h>
42
43#include "spufs.h"
44
45struct spufs_sb_info {
46	int debug;
47};
48
49static struct kmem_cache *spufs_inode_cache;
50char *isolated_loader;
51static int isolated_loader_size;
52
53static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
54{
55	return sb->s_fs_info;
56}
57
58static struct inode *
59spufs_alloc_inode(struct super_block *sb)
60{
61	struct spufs_inode_info *ei;
62
63	ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
64	if (!ei)
65		return NULL;
66
67	ei->i_gang = NULL;
68	ei->i_ctx = NULL;
69	ei->i_openers = 0;
70
71	return &ei->vfs_inode;
72}
73
74static void spufs_i_callback(struct rcu_head *head)
75{
76	struct inode *inode = container_of(head, struct inode, i_rcu);
77	kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
78}
79
80static void spufs_destroy_inode(struct inode *inode)
81{
82	call_rcu(&inode->i_rcu, spufs_i_callback);
83}
84
85static void
86spufs_init_once(void *p)
87{
88	struct spufs_inode_info *ei = p;
89
90	inode_init_once(&ei->vfs_inode);
91}
92
93static struct inode *
94spufs_new_inode(struct super_block *sb, umode_t mode)
95{
96	struct inode *inode;
97
98	inode = new_inode(sb);
99	if (!inode)
100		goto out;
101
102	inode->i_ino = get_next_ino();
103	inode->i_mode = mode;
104	inode->i_uid = current_fsuid();
105	inode->i_gid = current_fsgid();
106	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
107out:
108	return inode;
109}
110
111static int
112spufs_setattr(struct dentry *dentry, struct iattr *attr)
113{
114	struct inode *inode = d_inode(dentry);
115
116	if ((attr->ia_valid & ATTR_SIZE) &&
117	    (attr->ia_size != inode->i_size))
118		return -EINVAL;
119	setattr_copy(inode, attr);
120	mark_inode_dirty(inode);
121	return 0;
122}
123
124
125static int
126spufs_new_file(struct super_block *sb, struct dentry *dentry,
127		const struct file_operations *fops, umode_t mode,
128		size_t size, struct spu_context *ctx)
129{
130	static const struct inode_operations spufs_file_iops = {
131		.setattr = spufs_setattr,
132	};
133	struct inode *inode;
134	int ret;
135
136	ret = -ENOSPC;
137	inode = spufs_new_inode(sb, S_IFREG | mode);
138	if (!inode)
139		goto out;
140
141	ret = 0;
142	inode->i_op = &spufs_file_iops;
143	inode->i_fop = fops;
144	inode->i_size = size;
145	inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
146	d_add(dentry, inode);
147out:
148	return ret;
149}
150
151static void
152spufs_evict_inode(struct inode *inode)
153{
154	struct spufs_inode_info *ei = SPUFS_I(inode);
155	clear_inode(inode);
156	if (ei->i_ctx)
157		put_spu_context(ei->i_ctx);
158	if (ei->i_gang)
159		put_spu_gang(ei->i_gang);
160}
161
162static void spufs_prune_dir(struct dentry *dir)
163{
164	struct dentry *dentry, *tmp;
165
166	mutex_lock(&d_inode(dir)->i_mutex);
167	list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
168		spin_lock(&dentry->d_lock);
169		if (simple_positive(dentry)) {
170			dget_dlock(dentry);
171			__d_drop(dentry);
172			spin_unlock(&dentry->d_lock);
173			simple_unlink(d_inode(dir), dentry);
174			/* XXX: what was dcache_lock protecting here? Other
175			 * filesystems (IB, configfs) release dcache_lock
176			 * before unlink */
177			dput(dentry);
178		} else {
179			spin_unlock(&dentry->d_lock);
180		}
181	}
182	shrink_dcache_parent(dir);
183	mutex_unlock(&d_inode(dir)->i_mutex);
184}
185
186/* Caller must hold parent->i_mutex */
187static int spufs_rmdir(struct inode *parent, struct dentry *dir)
188{
189	/* remove all entries */
190	int res;
191	spufs_prune_dir(dir);
192	d_drop(dir);
193	res = simple_rmdir(parent, dir);
194	/* We have to give up the mm_struct */
195	spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
196	return res;
197}
198
199static int spufs_fill_dir(struct dentry *dir,
200		const struct spufs_tree_descr *files, umode_t mode,
201		struct spu_context *ctx)
202{
203	while (files->name && files->name[0]) {
204		int ret;
205		struct dentry *dentry = d_alloc_name(dir, files->name);
206		if (!dentry)
207			return -ENOMEM;
208		ret = spufs_new_file(dir->d_sb, dentry, files->ops,
209					files->mode & mode, files->size, ctx);
210		if (ret)
211			return ret;
212		files++;
213	}
214	return 0;
215}
216
217static int spufs_dir_close(struct inode *inode, struct file *file)
218{
219	struct spu_context *ctx;
220	struct inode *parent;
221	struct dentry *dir;
222	int ret;
223
224	dir = file->f_path.dentry;
225	parent = d_inode(dir->d_parent);
226	ctx = SPUFS_I(d_inode(dir))->i_ctx;
227
228	mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
229	ret = spufs_rmdir(parent, dir);
230	mutex_unlock(&parent->i_mutex);
231	WARN_ON(ret);
232
233	return dcache_dir_close(inode, file);
234}
235
236const struct file_operations spufs_context_fops = {
237	.open		= dcache_dir_open,
238	.release	= spufs_dir_close,
239	.llseek		= dcache_dir_lseek,
240	.read		= generic_read_dir,
241	.iterate	= dcache_readdir,
242	.fsync		= noop_fsync,
243};
244EXPORT_SYMBOL_GPL(spufs_context_fops);
245
246static int
247spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
248		umode_t mode)
249{
250	int ret;
251	struct inode *inode;
252	struct spu_context *ctx;
253
254	inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
255	if (!inode)
256		return -ENOSPC;
257
258	if (dir->i_mode & S_ISGID) {
259		inode->i_gid = dir->i_gid;
260		inode->i_mode &= S_ISGID;
261	}
262	ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
263	SPUFS_I(inode)->i_ctx = ctx;
264	if (!ctx) {
265		iput(inode);
266		return -ENOSPC;
267	}
268
269	ctx->flags = flags;
270	inode->i_op = &simple_dir_inode_operations;
271	inode->i_fop = &simple_dir_operations;
272
273	mutex_lock(&inode->i_mutex);
274
275	dget(dentry);
276	inc_nlink(dir);
277	inc_nlink(inode);
278
279	d_instantiate(dentry, inode);
280
281	if (flags & SPU_CREATE_NOSCHED)
282		ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
283					 mode, ctx);
284	else
285		ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
286
287	if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
288		ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
289				mode, ctx);
290
291	if (ret)
292		spufs_rmdir(dir, dentry);
293
294	mutex_unlock(&inode->i_mutex);
295
296	return ret;
297}
298
299static int spufs_context_open(struct path *path)
300{
301	int ret;
302	struct file *filp;
303
304	ret = get_unused_fd_flags(0);
305	if (ret < 0)
306		return ret;
307
308	filp = dentry_open(path, O_RDONLY, current_cred());
309	if (IS_ERR(filp)) {
310		put_unused_fd(ret);
311		return PTR_ERR(filp);
312	}
313
314	filp->f_op = &spufs_context_fops;
315	fd_install(ret, filp);
316	return ret;
317}
318
319static struct spu_context *
320spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
321						struct file *filp)
322{
323	struct spu_context *tmp, *neighbor, *err;
324	int count, node;
325	int aff_supp;
326
327	aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
328					struct spu, cbe_list))->aff_list);
329
330	if (!aff_supp)
331		return ERR_PTR(-EINVAL);
332
333	if (flags & SPU_CREATE_GANG)
334		return ERR_PTR(-EINVAL);
335
336	if (flags & SPU_CREATE_AFFINITY_MEM &&
337	    gang->aff_ref_ctx &&
338	    gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
339		return ERR_PTR(-EEXIST);
340
341	if (gang->aff_flags & AFF_MERGED)
342		return ERR_PTR(-EBUSY);
343
344	neighbor = NULL;
345	if (flags & SPU_CREATE_AFFINITY_SPU) {
346		if (!filp || filp->f_op != &spufs_context_fops)
347			return ERR_PTR(-EINVAL);
348
349		neighbor = get_spu_context(
350				SPUFS_I(file_inode(filp))->i_ctx);
351
352		if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
353		    !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
354		    !list_entry(neighbor->aff_list.next, struct spu_context,
355		    aff_list)->aff_head) {
356			err = ERR_PTR(-EEXIST);
357			goto out_put_neighbor;
358		}
359
360		if (gang != neighbor->gang) {
361			err = ERR_PTR(-EINVAL);
362			goto out_put_neighbor;
363		}
364
365		count = 1;
366		list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
367			count++;
368		if (list_empty(&neighbor->aff_list))
369			count++;
370
371		for (node = 0; node < MAX_NUMNODES; node++) {
372			if ((cbe_spu_info[node].n_spus - atomic_read(
373				&cbe_spu_info[node].reserved_spus)) >= count)
374				break;
375		}
376
377		if (node == MAX_NUMNODES) {
378			err = ERR_PTR(-EEXIST);
379			goto out_put_neighbor;
380		}
381	}
382
383	return neighbor;
384
385out_put_neighbor:
386	put_spu_context(neighbor);
387	return err;
388}
389
390static void
391spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
392					struct spu_context *neighbor)
393{
394	if (flags & SPU_CREATE_AFFINITY_MEM)
395		ctx->gang->aff_ref_ctx = ctx;
396
397	if (flags & SPU_CREATE_AFFINITY_SPU) {
398		if (list_empty(&neighbor->aff_list)) {
399			list_add_tail(&neighbor->aff_list,
400				&ctx->gang->aff_list_head);
401			neighbor->aff_head = 1;
402		}
403
404		if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
405		    || list_entry(neighbor->aff_list.next, struct spu_context,
406							aff_list)->aff_head) {
407			list_add(&ctx->aff_list, &neighbor->aff_list);
408		} else  {
409			list_add_tail(&ctx->aff_list, &neighbor->aff_list);
410			if (neighbor->aff_head) {
411				neighbor->aff_head = 0;
412				ctx->aff_head = 1;
413			}
414		}
415
416		if (!ctx->gang->aff_ref_ctx)
417			ctx->gang->aff_ref_ctx = ctx;
418	}
419}
420
421static int
422spufs_create_context(struct inode *inode, struct dentry *dentry,
423			struct vfsmount *mnt, int flags, umode_t mode,
424			struct file *aff_filp)
425{
426	int ret;
427	int affinity;
428	struct spu_gang *gang;
429	struct spu_context *neighbor;
430	struct path path = {.mnt = mnt, .dentry = dentry};
431
432	if ((flags & SPU_CREATE_NOSCHED) &&
433	    !capable(CAP_SYS_NICE))
434		return -EPERM;
435
436	if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
437	    == SPU_CREATE_ISOLATE)
438		return -EINVAL;
439
440	if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
441		return -ENODEV;
442
443	gang = NULL;
444	neighbor = NULL;
445	affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
446	if (affinity) {
447		gang = SPUFS_I(inode)->i_gang;
448		if (!gang)
449			return -EINVAL;
450		mutex_lock(&gang->aff_mutex);
451		neighbor = spufs_assert_affinity(flags, gang, aff_filp);
452		if (IS_ERR(neighbor)) {
453			ret = PTR_ERR(neighbor);
454			goto out_aff_unlock;
455		}
456	}
457
458	ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
459	if (ret)
460		goto out_aff_unlock;
461
462	if (affinity) {
463		spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
464								neighbor);
465		if (neighbor)
466			put_spu_context(neighbor);
467	}
468
469	ret = spufs_context_open(&path);
470	if (ret < 0)
471		WARN_ON(spufs_rmdir(inode, dentry));
472
473out_aff_unlock:
474	if (affinity)
475		mutex_unlock(&gang->aff_mutex);
476	return ret;
477}
478
479static int
480spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
481{
482	int ret;
483	struct inode *inode;
484	struct spu_gang *gang;
485
486	ret = -ENOSPC;
487	inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
488	if (!inode)
489		goto out;
490
491	ret = 0;
492	if (dir->i_mode & S_ISGID) {
493		inode->i_gid = dir->i_gid;
494		inode->i_mode &= S_ISGID;
495	}
496	gang = alloc_spu_gang();
497	SPUFS_I(inode)->i_ctx = NULL;
498	SPUFS_I(inode)->i_gang = gang;
499	if (!gang)
500		goto out_iput;
501
502	inode->i_op = &simple_dir_inode_operations;
503	inode->i_fop = &simple_dir_operations;
504
505	d_instantiate(dentry, inode);
506	inc_nlink(dir);
507	inc_nlink(d_inode(dentry));
508	return ret;
509
510out_iput:
511	iput(inode);
512out:
513	return ret;
514}
515
516static int spufs_gang_open(struct path *path)
517{
518	int ret;
519	struct file *filp;
520
521	ret = get_unused_fd_flags(0);
522	if (ret < 0)
523		return ret;
524
525	/*
526	 * get references for dget and mntget, will be released
527	 * in error path of *_open().
528	 */
529	filp = dentry_open(path, O_RDONLY, current_cred());
530	if (IS_ERR(filp)) {
531		put_unused_fd(ret);
532		return PTR_ERR(filp);
533	}
534
535	filp->f_op = &simple_dir_operations;
536	fd_install(ret, filp);
537	return ret;
538}
539
540static int spufs_create_gang(struct inode *inode,
541			struct dentry *dentry,
542			struct vfsmount *mnt, umode_t mode)
543{
544	struct path path = {.mnt = mnt, .dentry = dentry};
545	int ret;
546
547	ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
548	if (!ret) {
549		ret = spufs_gang_open(&path);
550		if (ret < 0) {
551			int err = simple_rmdir(inode, dentry);
552			WARN_ON(err);
553		}
554	}
555	return ret;
556}
557
558
559static struct file_system_type spufs_type;
560
561long spufs_create(struct path *path, struct dentry *dentry,
562		unsigned int flags, umode_t mode, struct file *filp)
563{
564	struct inode *dir = d_inode(path->dentry);
565	int ret;
566
567	/* check if we are on spufs */
568	if (path->dentry->d_sb->s_type != &spufs_type)
569		return -EINVAL;
570
571	/* don't accept undefined flags */
572	if (flags & (~SPU_CREATE_FLAG_ALL))
573		return -EINVAL;
574
575	/* only threads can be underneath a gang */
576	if (path->dentry != path->dentry->d_sb->s_root)
577		if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
578			return -EINVAL;
579
580	mode &= ~current_umask();
581
582	if (flags & SPU_CREATE_GANG)
583		ret = spufs_create_gang(dir, dentry, path->mnt, mode);
584	else
585		ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
586					    filp);
587	if (ret >= 0)
588		fsnotify_mkdir(dir, dentry);
589
590	return ret;
591}
592
593/* File system initialization */
594enum {
595	Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
596};
597
598static const match_table_t spufs_tokens = {
599	{ Opt_uid,   "uid=%d" },
600	{ Opt_gid,   "gid=%d" },
601	{ Opt_mode,  "mode=%o" },
602	{ Opt_debug, "debug" },
603	{ Opt_err,    NULL  },
604};
605
606static int
607spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
608{
609	char *p;
610	substring_t args[MAX_OPT_ARGS];
611
612	while ((p = strsep(&options, ",")) != NULL) {
613		int token, option;
614
615		if (!*p)
616			continue;
617
618		token = match_token(p, spufs_tokens, args);
619		switch (token) {
620		case Opt_uid:
621			if (match_int(&args[0], &option))
622				return 0;
623			root->i_uid = make_kuid(current_user_ns(), option);
624			if (!uid_valid(root->i_uid))
625				return 0;
626			break;
627		case Opt_gid:
628			if (match_int(&args[0], &option))
629				return 0;
630			root->i_gid = make_kgid(current_user_ns(), option);
631			if (!gid_valid(root->i_gid))
632				return 0;
633			break;
634		case Opt_mode:
635			if (match_octal(&args[0], &option))
636				return 0;
637			root->i_mode = option | S_IFDIR;
638			break;
639		case Opt_debug:
640			spufs_get_sb_info(sb)->debug = 1;
641			break;
642		default:
643			return 0;
644		}
645	}
646	return 1;
647}
648
649static void spufs_exit_isolated_loader(void)
650{
651	free_pages((unsigned long) isolated_loader,
652			get_order(isolated_loader_size));
653}
654
655static void
656spufs_init_isolated_loader(void)
657{
658	struct device_node *dn;
659	const char *loader;
660	int size;
661
662	dn = of_find_node_by_path("/spu-isolation");
663	if (!dn)
664		return;
665
666	loader = of_get_property(dn, "loader", &size);
667	if (!loader)
668		return;
669
670	/* the loader must be align on a 16 byte boundary */
671	isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
672	if (!isolated_loader)
673		return;
674
675	isolated_loader_size = size;
676	memcpy(isolated_loader, loader, size);
677	printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
678}
679
680static int
681spufs_create_root(struct super_block *sb, void *data)
682{
683	struct inode *inode;
684	int ret;
685
686	ret = -ENODEV;
687	if (!spu_management_ops)
688		goto out;
689
690	ret = -ENOMEM;
691	inode = spufs_new_inode(sb, S_IFDIR | 0775);
692	if (!inode)
693		goto out;
694
695	inode->i_op = &simple_dir_inode_operations;
696	inode->i_fop = &simple_dir_operations;
697	SPUFS_I(inode)->i_ctx = NULL;
698	inc_nlink(inode);
699
700	ret = -EINVAL;
701	if (!spufs_parse_options(sb, data, inode))
702		goto out_iput;
703
704	ret = -ENOMEM;
705	sb->s_root = d_make_root(inode);
706	if (!sb->s_root)
707		goto out;
708
709	return 0;
710out_iput:
711	iput(inode);
712out:
713	return ret;
714}
715
716static int
717spufs_fill_super(struct super_block *sb, void *data, int silent)
718{
719	struct spufs_sb_info *info;
720	static const struct super_operations s_ops = {
721		.alloc_inode = spufs_alloc_inode,
722		.destroy_inode = spufs_destroy_inode,
723		.statfs = simple_statfs,
724		.evict_inode = spufs_evict_inode,
725		.show_options = generic_show_options,
726	};
727
728	save_mount_options(sb, data);
729
730	info = kzalloc(sizeof(*info), GFP_KERNEL);
731	if (!info)
732		return -ENOMEM;
733
734	sb->s_maxbytes = MAX_LFS_FILESIZE;
735	sb->s_blocksize = PAGE_CACHE_SIZE;
736	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
737	sb->s_magic = SPUFS_MAGIC;
738	sb->s_op = &s_ops;
739	sb->s_fs_info = info;
740
741	return spufs_create_root(sb, data);
742}
743
744static struct dentry *
745spufs_mount(struct file_system_type *fstype, int flags,
746		const char *name, void *data)
747{
748	return mount_single(fstype, flags, data, spufs_fill_super);
749}
750
751static struct file_system_type spufs_type = {
752	.owner = THIS_MODULE,
753	.name = "spufs",
754	.mount = spufs_mount,
755	.kill_sb = kill_litter_super,
756};
757MODULE_ALIAS_FS("spufs");
758
759static int __init spufs_init(void)
760{
761	int ret;
762
763	ret = -ENODEV;
764	if (!spu_management_ops)
765		goto out;
766
767	ret = -ENOMEM;
768	spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
769			sizeof(struct spufs_inode_info), 0,
770			SLAB_HWCACHE_ALIGN, spufs_init_once);
771
772	if (!spufs_inode_cache)
773		goto out;
774	ret = spu_sched_init();
775	if (ret)
776		goto out_cache;
777	ret = register_spu_syscalls(&spufs_calls);
778	if (ret)
779		goto out_sched;
780	ret = register_filesystem(&spufs_type);
781	if (ret)
782		goto out_syscalls;
783
784	spufs_init_isolated_loader();
785
786	return 0;
787
788out_syscalls:
789	unregister_spu_syscalls(&spufs_calls);
790out_sched:
791	spu_sched_exit();
792out_cache:
793	kmem_cache_destroy(spufs_inode_cache);
794out:
795	return ret;
796}
797module_init(spufs_init);
798
799static void __exit spufs_exit(void)
800{
801	spu_sched_exit();
802	spufs_exit_isolated_loader();
803	unregister_spu_syscalls(&spufs_calls);
804	unregister_filesystem(&spufs_type);
805	kmem_cache_destroy(spufs_inode_cache);
806}
807module_exit(spufs_exit);
808
809MODULE_LICENSE("GPL");
810MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
811
812