1// SPDX-License-Identifier: GPL-2.0-or-later
2
3/*
4 * SPU file system
5 *
6 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
7 *
8 * Author: Arnd Bergmann <arndb@de.ibm.com>
9 */
10
11#include <linux/file.h>
12#include <linux/fs.h>
13#include <linux/fs_context.h>
14#include <linux/fs_parser.h>
15#include <linux/fsnotify.h>
16#include <linux/backing-dev.h>
17#include <linux/init.h>
18#include <linux/ioctl.h>
19#include <linux/module.h>
20#include <linux/mount.h>
21#include <linux/namei.h>
22#include <linux/pagemap.h>
23#include <linux/poll.h>
24#include <linux/slab.h>
25
26#include <asm/prom.h>
27#include <asm/spu.h>
28#include <asm/spu_priv1.h>
29#include <linux/uaccess.h>
30
31#include "spufs.h"
32
33struct spufs_sb_info {
34	bool debug;
35};
36
37static struct kmem_cache *spufs_inode_cache;
38char *isolated_loader;
39static int isolated_loader_size;
40
41static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
42{
43	return sb->s_fs_info;
44}
45
46static struct inode *
47spufs_alloc_inode(struct super_block *sb)
48{
49	struct spufs_inode_info *ei;
50
51	ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
52	if (!ei)
53		return NULL;
54
55	ei->i_gang = NULL;
56	ei->i_ctx = NULL;
57	ei->i_openers = 0;
58
59	return &ei->vfs_inode;
60}
61
62static void spufs_free_inode(struct inode *inode)
63{
64	kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
65}
66
67static void
68spufs_init_once(void *p)
69{
70	struct spufs_inode_info *ei = p;
71
72	inode_init_once(&ei->vfs_inode);
73}
74
75static struct inode *
76spufs_new_inode(struct super_block *sb, umode_t mode)
77{
78	struct inode *inode;
79
80	inode = new_inode(sb);
81	if (!inode)
82		goto out;
83
84	inode->i_ino = get_next_ino();
85	inode->i_mode = mode;
86	inode->i_uid = current_fsuid();
87	inode->i_gid = current_fsgid();
88	inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
89out:
90	return inode;
91}
92
93static int
94spufs_setattr(struct dentry *dentry, struct iattr *attr)
95{
96	struct inode *inode = d_inode(dentry);
97
98	if ((attr->ia_valid & ATTR_SIZE) &&
99	    (attr->ia_size != inode->i_size))
100		return -EINVAL;
101	setattr_copy(inode, attr);
102	mark_inode_dirty(inode);
103	return 0;
104}
105
106
107static int
108spufs_new_file(struct super_block *sb, struct dentry *dentry,
109		const struct file_operations *fops, umode_t mode,
110		size_t size, struct spu_context *ctx)
111{
112	static const struct inode_operations spufs_file_iops = {
113		.setattr = spufs_setattr,
114	};
115	struct inode *inode;
116	int ret;
117
118	ret = -ENOSPC;
119	inode = spufs_new_inode(sb, S_IFREG | mode);
120	if (!inode)
121		goto out;
122
123	ret = 0;
124	inode->i_op = &spufs_file_iops;
125	inode->i_fop = fops;
126	inode->i_size = size;
127	inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
128	d_add(dentry, inode);
129out:
130	return ret;
131}
132
133static void
134spufs_evict_inode(struct inode *inode)
135{
136	struct spufs_inode_info *ei = SPUFS_I(inode);
137	clear_inode(inode);
138	if (ei->i_ctx)
139		put_spu_context(ei->i_ctx);
140	if (ei->i_gang)
141		put_spu_gang(ei->i_gang);
142}
143
144static void spufs_prune_dir(struct dentry *dir)
145{
146	struct dentry *dentry, *tmp;
147
148	inode_lock(d_inode(dir));
149	list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
150		spin_lock(&dentry->d_lock);
151		if (simple_positive(dentry)) {
152			dget_dlock(dentry);
153			__d_drop(dentry);
154			spin_unlock(&dentry->d_lock);
155			simple_unlink(d_inode(dir), dentry);
156			/* XXX: what was dcache_lock protecting here? Other
157			 * filesystems (IB, configfs) release dcache_lock
158			 * before unlink */
159			dput(dentry);
160		} else {
161			spin_unlock(&dentry->d_lock);
162		}
163	}
164	shrink_dcache_parent(dir);
165	inode_unlock(d_inode(dir));
166}
167
168/* Caller must hold parent->i_mutex */
169static int spufs_rmdir(struct inode *parent, struct dentry *dir)
170{
171	/* remove all entries */
172	int res;
173	spufs_prune_dir(dir);
174	d_drop(dir);
175	res = simple_rmdir(parent, dir);
176	/* We have to give up the mm_struct */
177	spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
178	return res;
179}
180
181static int spufs_fill_dir(struct dentry *dir,
182		const struct spufs_tree_descr *files, umode_t mode,
183		struct spu_context *ctx)
184{
185	while (files->name && files->name[0]) {
186		int ret;
187		struct dentry *dentry = d_alloc_name(dir, files->name);
188		if (!dentry)
189			return -ENOMEM;
190		ret = spufs_new_file(dir->d_sb, dentry, files->ops,
191					files->mode & mode, files->size, ctx);
192		if (ret)
193			return ret;
194		files++;
195	}
196	return 0;
197}
198
199static int spufs_dir_close(struct inode *inode, struct file *file)
200{
201	struct inode *parent;
202	struct dentry *dir;
203	int ret;
204
205	dir = file->f_path.dentry;
206	parent = d_inode(dir->d_parent);
207
208	inode_lock_nested(parent, I_MUTEX_PARENT);
209	ret = spufs_rmdir(parent, dir);
210	inode_unlock(parent);
211	WARN_ON(ret);
212
213	return dcache_dir_close(inode, file);
214}
215
216const struct file_operations spufs_context_fops = {
217	.open		= dcache_dir_open,
218	.release	= spufs_dir_close,
219	.llseek		= dcache_dir_lseek,
220	.read		= generic_read_dir,
221	.iterate_shared	= dcache_readdir,
222	.fsync		= noop_fsync,
223};
224EXPORT_SYMBOL_GPL(spufs_context_fops);
225
226static int
227spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
228		umode_t mode)
229{
230	int ret;
231	struct inode *inode;
232	struct spu_context *ctx;
233
234	inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
235	if (!inode)
236		return -ENOSPC;
237
238	if (dir->i_mode & S_ISGID) {
239		inode->i_gid = dir->i_gid;
240		inode->i_mode &= S_ISGID;
241	}
242	ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
243	SPUFS_I(inode)->i_ctx = ctx;
244	if (!ctx) {
245		iput(inode);
246		return -ENOSPC;
247	}
248
249	ctx->flags = flags;
250	inode->i_op = &simple_dir_inode_operations;
251	inode->i_fop = &simple_dir_operations;
252
253	inode_lock(inode);
254
255	dget(dentry);
256	inc_nlink(dir);
257	inc_nlink(inode);
258
259	d_instantiate(dentry, inode);
260
261	if (flags & SPU_CREATE_NOSCHED)
262		ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
263					 mode, ctx);
264	else
265		ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
266
267	if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
268		ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
269				mode, ctx);
270
271	if (ret)
272		spufs_rmdir(dir, dentry);
273
274	inode_unlock(inode);
275
276	return ret;
277}
278
279static int spufs_context_open(struct path *path)
280{
281	int ret;
282	struct file *filp;
283
284	ret = get_unused_fd_flags(0);
285	if (ret < 0)
286		return ret;
287
288	filp = dentry_open(path, O_RDONLY, current_cred());
289	if (IS_ERR(filp)) {
290		put_unused_fd(ret);
291		return PTR_ERR(filp);
292	}
293
294	filp->f_op = &spufs_context_fops;
295	fd_install(ret, filp);
296	return ret;
297}
298
299static struct spu_context *
300spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
301						struct file *filp)
302{
303	struct spu_context *tmp, *neighbor, *err;
304	int count, node;
305	int aff_supp;
306
307	aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
308					struct spu, cbe_list))->aff_list);
309
310	if (!aff_supp)
311		return ERR_PTR(-EINVAL);
312
313	if (flags & SPU_CREATE_GANG)
314		return ERR_PTR(-EINVAL);
315
316	if (flags & SPU_CREATE_AFFINITY_MEM &&
317	    gang->aff_ref_ctx &&
318	    gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
319		return ERR_PTR(-EEXIST);
320
321	if (gang->aff_flags & AFF_MERGED)
322		return ERR_PTR(-EBUSY);
323
324	neighbor = NULL;
325	if (flags & SPU_CREATE_AFFINITY_SPU) {
326		if (!filp || filp->f_op != &spufs_context_fops)
327			return ERR_PTR(-EINVAL);
328
329		neighbor = get_spu_context(
330				SPUFS_I(file_inode(filp))->i_ctx);
331
332		if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
333		    !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
334		    !list_entry(neighbor->aff_list.next, struct spu_context,
335		    aff_list)->aff_head) {
336			err = ERR_PTR(-EEXIST);
337			goto out_put_neighbor;
338		}
339
340		if (gang != neighbor->gang) {
341			err = ERR_PTR(-EINVAL);
342			goto out_put_neighbor;
343		}
344
345		count = 1;
346		list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
347			count++;
348		if (list_empty(&neighbor->aff_list))
349			count++;
350
351		for (node = 0; node < MAX_NUMNODES; node++) {
352			if ((cbe_spu_info[node].n_spus - atomic_read(
353				&cbe_spu_info[node].reserved_spus)) >= count)
354				break;
355		}
356
357		if (node == MAX_NUMNODES) {
358			err = ERR_PTR(-EEXIST);
359			goto out_put_neighbor;
360		}
361	}
362
363	return neighbor;
364
365out_put_neighbor:
366	put_spu_context(neighbor);
367	return err;
368}
369
370static void
371spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
372					struct spu_context *neighbor)
373{
374	if (flags & SPU_CREATE_AFFINITY_MEM)
375		ctx->gang->aff_ref_ctx = ctx;
376
377	if (flags & SPU_CREATE_AFFINITY_SPU) {
378		if (list_empty(&neighbor->aff_list)) {
379			list_add_tail(&neighbor->aff_list,
380				&ctx->gang->aff_list_head);
381			neighbor->aff_head = 1;
382		}
383
384		if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
385		    || list_entry(neighbor->aff_list.next, struct spu_context,
386							aff_list)->aff_head) {
387			list_add(&ctx->aff_list, &neighbor->aff_list);
388		} else  {
389			list_add_tail(&ctx->aff_list, &neighbor->aff_list);
390			if (neighbor->aff_head) {
391				neighbor->aff_head = 0;
392				ctx->aff_head = 1;
393			}
394		}
395
396		if (!ctx->gang->aff_ref_ctx)
397			ctx->gang->aff_ref_ctx = ctx;
398	}
399}
400
401static int
402spufs_create_context(struct inode *inode, struct dentry *dentry,
403			struct vfsmount *mnt, int flags, umode_t mode,
404			struct file *aff_filp)
405{
406	int ret;
407	int affinity;
408	struct spu_gang *gang;
409	struct spu_context *neighbor;
410	struct path path = {.mnt = mnt, .dentry = dentry};
411
412	if ((flags & SPU_CREATE_NOSCHED) &&
413	    !capable(CAP_SYS_NICE))
414		return -EPERM;
415
416	if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
417	    == SPU_CREATE_ISOLATE)
418		return -EINVAL;
419
420	if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
421		return -ENODEV;
422
423	gang = NULL;
424	neighbor = NULL;
425	affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
426	if (affinity) {
427		gang = SPUFS_I(inode)->i_gang;
428		if (!gang)
429			return -EINVAL;
430		mutex_lock(&gang->aff_mutex);
431		neighbor = spufs_assert_affinity(flags, gang, aff_filp);
432		if (IS_ERR(neighbor)) {
433			ret = PTR_ERR(neighbor);
434			goto out_aff_unlock;
435		}
436	}
437
438	ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
439	if (ret)
440		goto out_aff_unlock;
441
442	if (affinity) {
443		spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
444								neighbor);
445		if (neighbor)
446			put_spu_context(neighbor);
447	}
448
449	ret = spufs_context_open(&path);
450	if (ret < 0)
451		WARN_ON(spufs_rmdir(inode, dentry));
452
453out_aff_unlock:
454	if (affinity)
455		mutex_unlock(&gang->aff_mutex);
456	return ret;
457}
458
459static int
460spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
461{
462	int ret;
463	struct inode *inode;
464	struct spu_gang *gang;
465
466	ret = -ENOSPC;
467	inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
468	if (!inode)
469		goto out;
470
471	ret = 0;
472	if (dir->i_mode & S_ISGID) {
473		inode->i_gid = dir->i_gid;
474		inode->i_mode &= S_ISGID;
475	}
476	gang = alloc_spu_gang();
477	SPUFS_I(inode)->i_ctx = NULL;
478	SPUFS_I(inode)->i_gang = gang;
479	if (!gang) {
480		ret = -ENOMEM;
481		goto out_iput;
482	}
483
484	inode->i_op = &simple_dir_inode_operations;
485	inode->i_fop = &simple_dir_operations;
486
487	d_instantiate(dentry, inode);
488	inc_nlink(dir);
489	inc_nlink(d_inode(dentry));
490	return ret;
491
492out_iput:
493	iput(inode);
494out:
495	return ret;
496}
497
498static int spufs_gang_open(struct path *path)
499{
500	int ret;
501	struct file *filp;
502
503	ret = get_unused_fd_flags(0);
504	if (ret < 0)
505		return ret;
506
507	/*
508	 * get references for dget and mntget, will be released
509	 * in error path of *_open().
510	 */
511	filp = dentry_open(path, O_RDONLY, current_cred());
512	if (IS_ERR(filp)) {
513		put_unused_fd(ret);
514		return PTR_ERR(filp);
515	}
516
517	filp->f_op = &simple_dir_operations;
518	fd_install(ret, filp);
519	return ret;
520}
521
522static int spufs_create_gang(struct inode *inode,
523			struct dentry *dentry,
524			struct vfsmount *mnt, umode_t mode)
525{
526	struct path path = {.mnt = mnt, .dentry = dentry};
527	int ret;
528
529	ret = spufs_mkgang(inode, dentry, mode & 0777);
530	if (!ret) {
531		ret = spufs_gang_open(&path);
532		if (ret < 0) {
533			int err = simple_rmdir(inode, dentry);
534			WARN_ON(err);
535		}
536	}
537	return ret;
538}
539
540
541static struct file_system_type spufs_type;
542
543long spufs_create(struct path *path, struct dentry *dentry,
544		unsigned int flags, umode_t mode, struct file *filp)
545{
546	struct inode *dir = d_inode(path->dentry);
547	int ret;
548
549	/* check if we are on spufs */
550	if (path->dentry->d_sb->s_type != &spufs_type)
551		return -EINVAL;
552
553	/* don't accept undefined flags */
554	if (flags & (~SPU_CREATE_FLAG_ALL))
555		return -EINVAL;
556
557	/* only threads can be underneath a gang */
558	if (path->dentry != path->dentry->d_sb->s_root)
559		if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
560			return -EINVAL;
561
562	mode &= ~current_umask();
563
564	if (flags & SPU_CREATE_GANG)
565		ret = spufs_create_gang(dir, dentry, path->mnt, mode);
566	else
567		ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
568					    filp);
569	if (ret >= 0)
570		fsnotify_mkdir(dir, dentry);
571
572	return ret;
573}
574
575/* File system initialization */
576struct spufs_fs_context {
577	kuid_t	uid;
578	kgid_t	gid;
579	umode_t	mode;
580};
581
582enum {
583	Opt_uid, Opt_gid, Opt_mode, Opt_debug,
584};
585
586static const struct fs_parameter_spec spufs_fs_parameters[] = {
587	fsparam_u32	("gid",				Opt_gid),
588	fsparam_u32oct	("mode",			Opt_mode),
589	fsparam_u32	("uid",				Opt_uid),
590	fsparam_flag	("debug",			Opt_debug),
591	{}
592};
593
594static int spufs_show_options(struct seq_file *m, struct dentry *root)
595{
596	struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
597	struct inode *inode = root->d_inode;
598
599	if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
600		seq_printf(m, ",uid=%u",
601			   from_kuid_munged(&init_user_ns, inode->i_uid));
602	if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
603		seq_printf(m, ",gid=%u",
604			   from_kgid_munged(&init_user_ns, inode->i_gid));
605	if ((inode->i_mode & S_IALLUGO) != 0775)
606		seq_printf(m, ",mode=%o", inode->i_mode);
607	if (sbi->debug)
608		seq_puts(m, ",debug");
609	return 0;
610}
611
612static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
613{
614	struct spufs_fs_context *ctx = fc->fs_private;
615	struct spufs_sb_info *sbi = fc->s_fs_info;
616	struct fs_parse_result result;
617	kuid_t uid;
618	kgid_t gid;
619	int opt;
620
621	opt = fs_parse(fc, spufs_fs_parameters, param, &result);
622	if (opt < 0)
623		return opt;
624
625	switch (opt) {
626	case Opt_uid:
627		uid = make_kuid(current_user_ns(), result.uint_32);
628		if (!uid_valid(uid))
629			return invalf(fc, "Unknown uid");
630		ctx->uid = uid;
631		break;
632	case Opt_gid:
633		gid = make_kgid(current_user_ns(), result.uint_32);
634		if (!gid_valid(gid))
635			return invalf(fc, "Unknown gid");
636		ctx->gid = gid;
637		break;
638	case Opt_mode:
639		ctx->mode = result.uint_32 & S_IALLUGO;
640		break;
641	case Opt_debug:
642		sbi->debug = true;
643		break;
644	}
645
646	return 0;
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	of_node_put(dn);
668	if (!loader)
669		return;
670
671	/* the loader must be align on a 16 byte boundary */
672	isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
673	if (!isolated_loader)
674		return;
675
676	isolated_loader_size = size;
677	memcpy(isolated_loader, loader, size);
678	printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
679}
680
681static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
682{
683	struct spufs_fs_context *ctx = fc->fs_private;
684	struct inode *inode;
685
686	if (!spu_management_ops)
687		return -ENODEV;
688
689	inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
690	if (!inode)
691		return -ENOMEM;
692
693	inode->i_uid = ctx->uid;
694	inode->i_gid = ctx->gid;
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	sb->s_root = d_make_root(inode);
701	if (!sb->s_root)
702		return -ENOMEM;
703	return 0;
704}
705
706static const struct super_operations spufs_ops = {
707	.alloc_inode	= spufs_alloc_inode,
708	.free_inode	= spufs_free_inode,
709	.statfs		= simple_statfs,
710	.evict_inode	= spufs_evict_inode,
711	.show_options	= spufs_show_options,
712};
713
714static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
715{
716	sb->s_maxbytes = MAX_LFS_FILESIZE;
717	sb->s_blocksize = PAGE_SIZE;
718	sb->s_blocksize_bits = PAGE_SHIFT;
719	sb->s_magic = SPUFS_MAGIC;
720	sb->s_op = &spufs_ops;
721
722	return spufs_create_root(sb, fc);
723}
724
725static int spufs_get_tree(struct fs_context *fc)
726{
727	return get_tree_single(fc, spufs_fill_super);
728}
729
730static void spufs_free_fc(struct fs_context *fc)
731{
732	kfree(fc->s_fs_info);
733}
734
735static const struct fs_context_operations spufs_context_ops = {
736	.free		= spufs_free_fc,
737	.parse_param	= spufs_parse_param,
738	.get_tree	= spufs_get_tree,
739};
740
741static int spufs_init_fs_context(struct fs_context *fc)
742{
743	struct spufs_fs_context *ctx;
744	struct spufs_sb_info *sbi;
745
746	ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
747	if (!ctx)
748		goto nomem;
749
750	sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
751	if (!sbi)
752		goto nomem_ctx;
753
754	ctx->uid = current_uid();
755	ctx->gid = current_gid();
756	ctx->mode = 0755;
757
758	fc->fs_private = ctx;
759	fc->s_fs_info = sbi;
760	fc->ops = &spufs_context_ops;
761	return 0;
762
763nomem_ctx:
764	kfree(ctx);
765nomem:
766	return -ENOMEM;
767}
768
769static struct file_system_type spufs_type = {
770	.owner = THIS_MODULE,
771	.name = "spufs",
772	.init_fs_context = spufs_init_fs_context,
773	.parameters	= spufs_fs_parameters,
774	.kill_sb = kill_litter_super,
775};
776MODULE_ALIAS_FS("spufs");
777
778static int __init spufs_init(void)
779{
780	int ret;
781
782	ret = -ENODEV;
783	if (!spu_management_ops)
784		goto out;
785
786	ret = -ENOMEM;
787	spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
788			sizeof(struct spufs_inode_info), 0,
789			SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
790
791	if (!spufs_inode_cache)
792		goto out;
793	ret = spu_sched_init();
794	if (ret)
795		goto out_cache;
796	ret = register_spu_syscalls(&spufs_calls);
797	if (ret)
798		goto out_sched;
799	ret = register_filesystem(&spufs_type);
800	if (ret)
801		goto out_syscalls;
802
803	spufs_init_isolated_loader();
804
805	return 0;
806
807out_syscalls:
808	unregister_spu_syscalls(&spufs_calls);
809out_sched:
810	spu_sched_exit();
811out_cache:
812	kmem_cache_destroy(spufs_inode_cache);
813out:
814	return ret;
815}
816module_init(spufs_init);
817
818static void __exit spufs_exit(void)
819{
820	spu_sched_exit();
821	spufs_exit_isolated_loader();
822	unregister_spu_syscalls(&spufs_calls);
823	unregister_filesystem(&spufs_type);
824	kmem_cache_destroy(spufs_inode_cache);
825}
826module_exit(spufs_exit);
827
828MODULE_LICENSE("GPL");
829MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
830
831