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/of.h>
25#include <linux/seq_file.h>
26#include <linux/slab.h>
27
28#include <asm/spu.h>
29#include <asm/spu_priv1.h>
30#include <linux/uaccess.h>
31
32#include "spufs.h"
33
34struct spufs_sb_info {
35	bool debug;
36};
37
38static struct kmem_cache *spufs_inode_cache;
39char *isolated_loader;
40static int isolated_loader_size;
41
42static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
43{
44	return sb->s_fs_info;
45}
46
47static struct inode *
48spufs_alloc_inode(struct super_block *sb)
49{
50	struct spufs_inode_info *ei;
51
52	ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
53	if (!ei)
54		return NULL;
55
56	ei->i_gang = NULL;
57	ei->i_ctx = NULL;
58	ei->i_openers = 0;
59
60	return &ei->vfs_inode;
61}
62
63static void spufs_free_inode(struct inode *inode)
64{
65	kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
66}
67
68static void
69spufs_init_once(void *p)
70{
71	struct spufs_inode_info *ei = p;
72
73	inode_init_once(&ei->vfs_inode);
74}
75
76static struct inode *
77spufs_new_inode(struct super_block *sb, umode_t mode)
78{
79	struct inode *inode;
80
81	inode = new_inode(sb);
82	if (!inode)
83		goto out;
84
85	inode->i_ino = get_next_ino();
86	inode->i_mode = mode;
87	inode->i_uid = current_fsuid();
88	inode->i_gid = current_fsgid();
89	simple_inode_init_ts(inode);
90out:
91	return inode;
92}
93
94static int
95spufs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
96	      struct iattr *attr)
97{
98	struct inode *inode = d_inode(dentry);
99
100	if ((attr->ia_valid & ATTR_SIZE) &&
101	    (attr->ia_size != inode->i_size))
102		return -EINVAL;
103	setattr_copy(&nop_mnt_idmap, inode, attr);
104	mark_inode_dirty(inode);
105	return 0;
106}
107
108
109static int
110spufs_new_file(struct super_block *sb, struct dentry *dentry,
111		const struct file_operations *fops, umode_t mode,
112		size_t size, struct spu_context *ctx)
113{
114	static const struct inode_operations spufs_file_iops = {
115		.setattr = spufs_setattr,
116	};
117	struct inode *inode;
118	int ret;
119
120	ret = -ENOSPC;
121	inode = spufs_new_inode(sb, S_IFREG | mode);
122	if (!inode)
123		goto out;
124
125	ret = 0;
126	inode->i_op = &spufs_file_iops;
127	inode->i_fop = fops;
128	inode->i_size = size;
129	inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
130	d_add(dentry, inode);
131out:
132	return ret;
133}
134
135static void
136spufs_evict_inode(struct inode *inode)
137{
138	struct spufs_inode_info *ei = SPUFS_I(inode);
139	clear_inode(inode);
140	if (ei->i_ctx)
141		put_spu_context(ei->i_ctx);
142	if (ei->i_gang)
143		put_spu_gang(ei->i_gang);
144}
145
146static void spufs_prune_dir(struct dentry *dir)
147{
148	struct dentry *dentry;
149	struct hlist_node *n;
150
151	inode_lock(d_inode(dir));
152	hlist_for_each_entry_safe(dentry, n, &dir->d_children, d_sib) {
153		spin_lock(&dentry->d_lock);
154		if (simple_positive(dentry)) {
155			dget_dlock(dentry);
156			__d_drop(dentry);
157			spin_unlock(&dentry->d_lock);
158			simple_unlink(d_inode(dir), dentry);
159			/* XXX: what was dcache_lock protecting here? Other
160			 * filesystems (IB, configfs) release dcache_lock
161			 * before unlink */
162			dput(dentry);
163		} else {
164			spin_unlock(&dentry->d_lock);
165		}
166	}
167	shrink_dcache_parent(dir);
168	inode_unlock(d_inode(dir));
169}
170
171/* Caller must hold parent->i_mutex */
172static int spufs_rmdir(struct inode *parent, struct dentry *dir)
173{
174	/* remove all entries */
175	int res;
176	spufs_prune_dir(dir);
177	d_drop(dir);
178	res = simple_rmdir(parent, dir);
179	/* We have to give up the mm_struct */
180	spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
181	return res;
182}
183
184static int spufs_fill_dir(struct dentry *dir,
185		const struct spufs_tree_descr *files, umode_t mode,
186		struct spu_context *ctx)
187{
188	while (files->name && files->name[0]) {
189		int ret;
190		struct dentry *dentry = d_alloc_name(dir, files->name);
191		if (!dentry)
192			return -ENOMEM;
193		ret = spufs_new_file(dir->d_sb, dentry, files->ops,
194					files->mode & mode, files->size, ctx);
195		if (ret)
196			return ret;
197		files++;
198	}
199	return 0;
200}
201
202static int spufs_dir_close(struct inode *inode, struct file *file)
203{
204	struct inode *parent;
205	struct dentry *dir;
206	int ret;
207
208	dir = file->f_path.dentry;
209	parent = d_inode(dir->d_parent);
210
211	inode_lock_nested(parent, I_MUTEX_PARENT);
212	ret = spufs_rmdir(parent, dir);
213	inode_unlock(parent);
214	WARN_ON(ret);
215
216	return dcache_dir_close(inode, file);
217}
218
219const struct file_operations spufs_context_fops = {
220	.open		= dcache_dir_open,
221	.release	= spufs_dir_close,
222	.llseek		= dcache_dir_lseek,
223	.read		= generic_read_dir,
224	.iterate_shared	= dcache_readdir,
225	.fsync		= noop_fsync,
226};
227EXPORT_SYMBOL_GPL(spufs_context_fops);
228
229static int
230spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
231		umode_t mode)
232{
233	int ret;
234	struct inode *inode;
235	struct spu_context *ctx;
236
237	inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
238	if (!inode)
239		return -ENOSPC;
240
241	inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR);
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(const 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	inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR);
473	gang = alloc_spu_gang();
474	SPUFS_I(inode)->i_ctx = NULL;
475	SPUFS_I(inode)->i_gang = gang;
476	if (!gang) {
477		ret = -ENOMEM;
478		goto out_iput;
479	}
480
481	inode->i_op = &simple_dir_inode_operations;
482	inode->i_fop = &simple_dir_operations;
483
484	d_instantiate(dentry, inode);
485	inc_nlink(dir);
486	inc_nlink(d_inode(dentry));
487	return ret;
488
489out_iput:
490	iput(inode);
491out:
492	return ret;
493}
494
495static int spufs_gang_open(const struct path *path)
496{
497	int ret;
498	struct file *filp;
499
500	ret = get_unused_fd_flags(0);
501	if (ret < 0)
502		return ret;
503
504	/*
505	 * get references for dget and mntget, will be released
506	 * in error path of *_open().
507	 */
508	filp = dentry_open(path, O_RDONLY, current_cred());
509	if (IS_ERR(filp)) {
510		put_unused_fd(ret);
511		return PTR_ERR(filp);
512	}
513
514	filp->f_op = &simple_dir_operations;
515	fd_install(ret, filp);
516	return ret;
517}
518
519static int spufs_create_gang(struct inode *inode,
520			struct dentry *dentry,
521			struct vfsmount *mnt, umode_t mode)
522{
523	struct path path = {.mnt = mnt, .dentry = dentry};
524	int ret;
525
526	ret = spufs_mkgang(inode, dentry, mode & 0777);
527	if (!ret) {
528		ret = spufs_gang_open(&path);
529		if (ret < 0) {
530			int err = simple_rmdir(inode, dentry);
531			WARN_ON(err);
532		}
533	}
534	return ret;
535}
536
537
538static struct file_system_type spufs_type;
539
540long spufs_create(const struct path *path, struct dentry *dentry,
541		unsigned int flags, umode_t mode, struct file *filp)
542{
543	struct inode *dir = d_inode(path->dentry);
544	int ret;
545
546	/* check if we are on spufs */
547	if (path->dentry->d_sb->s_type != &spufs_type)
548		return -EINVAL;
549
550	/* don't accept undefined flags */
551	if (flags & (~SPU_CREATE_FLAG_ALL))
552		return -EINVAL;
553
554	/* only threads can be underneath a gang */
555	if (path->dentry != path->dentry->d_sb->s_root)
556		if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
557			return -EINVAL;
558
559	mode &= ~current_umask();
560
561	if (flags & SPU_CREATE_GANG)
562		ret = spufs_create_gang(dir, dentry, path->mnt, mode);
563	else
564		ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
565					    filp);
566	if (ret >= 0)
567		fsnotify_mkdir(dir, dentry);
568
569	return ret;
570}
571
572/* File system initialization */
573struct spufs_fs_context {
574	kuid_t	uid;
575	kgid_t	gid;
576	umode_t	mode;
577};
578
579enum {
580	Opt_uid, Opt_gid, Opt_mode, Opt_debug,
581};
582
583static const struct fs_parameter_spec spufs_fs_parameters[] = {
584	fsparam_u32	("gid",				Opt_gid),
585	fsparam_u32oct	("mode",			Opt_mode),
586	fsparam_u32	("uid",				Opt_uid),
587	fsparam_flag	("debug",			Opt_debug),
588	{}
589};
590
591static int spufs_show_options(struct seq_file *m, struct dentry *root)
592{
593	struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
594	struct inode *inode = root->d_inode;
595
596	if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
597		seq_printf(m, ",uid=%u",
598			   from_kuid_munged(&init_user_ns, inode->i_uid));
599	if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
600		seq_printf(m, ",gid=%u",
601			   from_kgid_munged(&init_user_ns, inode->i_gid));
602	if ((inode->i_mode & S_IALLUGO) != 0775)
603		seq_printf(m, ",mode=%o", inode->i_mode);
604	if (sbi->debug)
605		seq_puts(m, ",debug");
606	return 0;
607}
608
609static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
610{
611	struct spufs_fs_context *ctx = fc->fs_private;
612	struct spufs_sb_info *sbi = fc->s_fs_info;
613	struct fs_parse_result result;
614	kuid_t uid;
615	kgid_t gid;
616	int opt;
617
618	opt = fs_parse(fc, spufs_fs_parameters, param, &result);
619	if (opt < 0)
620		return opt;
621
622	switch (opt) {
623	case Opt_uid:
624		uid = make_kuid(current_user_ns(), result.uint_32);
625		if (!uid_valid(uid))
626			return invalf(fc, "Unknown uid");
627		ctx->uid = uid;
628		break;
629	case Opt_gid:
630		gid = make_kgid(current_user_ns(), result.uint_32);
631		if (!gid_valid(gid))
632			return invalf(fc, "Unknown gid");
633		ctx->gid = gid;
634		break;
635	case Opt_mode:
636		ctx->mode = result.uint_32 & S_IALLUGO;
637		break;
638	case Opt_debug:
639		sbi->debug = true;
640		break;
641	}
642
643	return 0;
644}
645
646static void spufs_exit_isolated_loader(void)
647{
648	free_pages((unsigned long) isolated_loader,
649			get_order(isolated_loader_size));
650}
651
652static void __init
653spufs_init_isolated_loader(void)
654{
655	struct device_node *dn;
656	const char *loader;
657	int size;
658
659	dn = of_find_node_by_path("/spu-isolation");
660	if (!dn)
661		return;
662
663	loader = of_get_property(dn, "loader", &size);
664	of_node_put(dn);
665	if (!loader)
666		return;
667
668	/* the loader must be align on a 16 byte boundary */
669	isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
670	if (!isolated_loader)
671		return;
672
673	isolated_loader_size = size;
674	memcpy(isolated_loader, loader, size);
675	printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
676}
677
678static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
679{
680	struct spufs_fs_context *ctx = fc->fs_private;
681	struct inode *inode;
682
683	if (!spu_management_ops)
684		return -ENODEV;
685
686	inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
687	if (!inode)
688		return -ENOMEM;
689
690	inode->i_uid = ctx->uid;
691	inode->i_gid = ctx->gid;
692	inode->i_op = &simple_dir_inode_operations;
693	inode->i_fop = &simple_dir_operations;
694	SPUFS_I(inode)->i_ctx = NULL;
695	inc_nlink(inode);
696
697	sb->s_root = d_make_root(inode);
698	if (!sb->s_root)
699		return -ENOMEM;
700	return 0;
701}
702
703static const struct super_operations spufs_ops = {
704	.alloc_inode	= spufs_alloc_inode,
705	.free_inode	= spufs_free_inode,
706	.statfs		= simple_statfs,
707	.evict_inode	= spufs_evict_inode,
708	.show_options	= spufs_show_options,
709};
710
711static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
712{
713	sb->s_maxbytes = MAX_LFS_FILESIZE;
714	sb->s_blocksize = PAGE_SIZE;
715	sb->s_blocksize_bits = PAGE_SHIFT;
716	sb->s_magic = SPUFS_MAGIC;
717	sb->s_op = &spufs_ops;
718
719	return spufs_create_root(sb, fc);
720}
721
722static int spufs_get_tree(struct fs_context *fc)
723{
724	return get_tree_single(fc, spufs_fill_super);
725}
726
727static void spufs_free_fc(struct fs_context *fc)
728{
729	kfree(fc->s_fs_info);
730}
731
732static const struct fs_context_operations spufs_context_ops = {
733	.free		= spufs_free_fc,
734	.parse_param	= spufs_parse_param,
735	.get_tree	= spufs_get_tree,
736};
737
738static int spufs_init_fs_context(struct fs_context *fc)
739{
740	struct spufs_fs_context *ctx;
741	struct spufs_sb_info *sbi;
742
743	ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
744	if (!ctx)
745		goto nomem;
746
747	sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
748	if (!sbi)
749		goto nomem_ctx;
750
751	ctx->uid = current_uid();
752	ctx->gid = current_gid();
753	ctx->mode = 0755;
754
755	fc->fs_private = ctx;
756	fc->s_fs_info = sbi;
757	fc->ops = &spufs_context_ops;
758	return 0;
759
760nomem_ctx:
761	kfree(ctx);
762nomem:
763	return -ENOMEM;
764}
765
766static struct file_system_type spufs_type = {
767	.owner = THIS_MODULE,
768	.name = "spufs",
769	.init_fs_context = spufs_init_fs_context,
770	.parameters	= spufs_fs_parameters,
771	.kill_sb = kill_litter_super,
772};
773MODULE_ALIAS_FS("spufs");
774
775static int __init spufs_init(void)
776{
777	int ret;
778
779	ret = -ENODEV;
780	if (!spu_management_ops)
781		goto out;
782
783	ret = -ENOMEM;
784	spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
785			sizeof(struct spufs_inode_info), 0,
786			SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
787
788	if (!spufs_inode_cache)
789		goto out;
790	ret = spu_sched_init();
791	if (ret)
792		goto out_cache;
793	ret = register_spu_syscalls(&spufs_calls);
794	if (ret)
795		goto out_sched;
796	ret = register_filesystem(&spufs_type);
797	if (ret)
798		goto out_syscalls;
799
800	spufs_init_isolated_loader();
801
802	return 0;
803
804out_syscalls:
805	unregister_spu_syscalls(&spufs_calls);
806out_sched:
807	spu_sched_exit();
808out_cache:
809	kmem_cache_destroy(spufs_inode_cache);
810out:
811	return ret;
812}
813module_init(spufs_init);
814
815static void __exit spufs_exit(void)
816{
817	spu_sched_exit();
818	spufs_exit_isolated_loader();
819	unregister_spu_syscalls(&spufs_calls);
820	unregister_filesystem(&spufs_type);
821	kmem_cache_destroy(spufs_inode_cache);
822}
823module_exit(spufs_exit);
824
825MODULE_LICENSE("GPL");
826MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
827
828