Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/pci-2.6
[linux-2.6] / arch / powerpc / platforms / cell / spufs / inode.c
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/backing-dev.h>
27 #include <linux/init.h>
28 #include <linux/ioctl.h>
29 #include <linux/module.h>
30 #include <linux/mount.h>
31 #include <linux/namei.h>
32 #include <linux/pagemap.h>
33 #include <linux/poll.h>
34 #include <linux/slab.h>
35 #include <linux/parser.h>
36
37 #include <asm/prom.h>
38 #include <asm/spu.h>
39 #include <asm/spu_priv1.h>
40 #include <asm/uaccess.h>
41
42 #include "spufs.h"
43
44 static struct kmem_cache *spufs_inode_cache;
45 char *isolated_loader;
46 static int isolated_loader_size;
47
48 static struct inode *
49 spufs_alloc_inode(struct super_block *sb)
50 {
51         struct spufs_inode_info *ei;
52
53         ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
54         if (!ei)
55                 return NULL;
56
57         ei->i_gang = NULL;
58         ei->i_ctx = NULL;
59         ei->i_openers = 0;
60
61         return &ei->vfs_inode;
62 }
63
64 static void
65 spufs_destroy_inode(struct inode *inode)
66 {
67         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
68 }
69
70 static void
71 spufs_init_once(struct kmem_cache *cachep, void *p)
72 {
73         struct spufs_inode_info *ei = p;
74
75         inode_init_once(&ei->vfs_inode);
76 }
77
78 static struct inode *
79 spufs_new_inode(struct super_block *sb, int mode)
80 {
81         struct inode *inode;
82
83         inode = new_inode(sb);
84         if (!inode)
85                 goto out;
86
87         inode->i_mode = mode;
88         inode->i_uid = current->fsuid;
89         inode->i_gid = current->fsgid;
90         inode->i_blocks = 0;
91         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
92 out:
93         return inode;
94 }
95
96 static int
97 spufs_setattr(struct dentry *dentry, struct iattr *attr)
98 {
99         struct inode *inode = dentry->d_inode;
100
101         if ((attr->ia_valid & ATTR_SIZE) &&
102             (attr->ia_size != inode->i_size))
103                 return -EINVAL;
104         return inode_setattr(inode, attr);
105 }
106
107
108 static int
109 spufs_new_file(struct super_block *sb, struct dentry *dentry,
110                 const struct file_operations *fops, int mode,
111                 struct spu_context *ctx)
112 {
113         static struct inode_operations spufs_file_iops = {
114                 .setattr = spufs_setattr,
115         };
116         struct inode *inode;
117         int ret;
118
119         ret = -ENOSPC;
120         inode = spufs_new_inode(sb, S_IFREG | mode);
121         if (!inode)
122                 goto out;
123
124         ret = 0;
125         inode->i_op = &spufs_file_iops;
126         inode->i_fop = fops;
127         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
128         d_add(dentry, inode);
129 out:
130         return ret;
131 }
132
133 static void
134 spufs_delete_inode(struct inode *inode)
135 {
136         struct spufs_inode_info *ei = SPUFS_I(inode);
137
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         clear_inode(inode);
143 }
144
145 static void spufs_prune_dir(struct dentry *dir)
146 {
147         struct dentry *dentry, *tmp;
148
149         mutex_lock(&dir->d_inode->i_mutex);
150         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
151                 spin_lock(&dcache_lock);
152                 spin_lock(&dentry->d_lock);
153                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
154                         dget_locked(dentry);
155                         __d_drop(dentry);
156                         spin_unlock(&dentry->d_lock);
157                         simple_unlink(dir->d_inode, dentry);
158                         spin_unlock(&dcache_lock);
159                         dput(dentry);
160                 } else {
161                         spin_unlock(&dentry->d_lock);
162                         spin_unlock(&dcache_lock);
163                 }
164         }
165         shrink_dcache_parent(dir);
166         mutex_unlock(&dir->d_inode->i_mutex);
167 }
168
169 /* Caller must hold parent->i_mutex */
170 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
171 {
172         /* remove all entries */
173         spufs_prune_dir(dir);
174         d_drop(dir);
175
176         return simple_rmdir(parent, dir);
177 }
178
179 static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
180                           int mode, struct spu_context *ctx)
181 {
182         struct dentry *dentry, *tmp;
183         int ret;
184
185         while (files->name && files->name[0]) {
186                 ret = -ENOMEM;
187                 dentry = d_alloc_name(dir, files->name);
188                 if (!dentry)
189                         goto out;
190                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
191                                         files->mode & mode, ctx);
192                 if (ret)
193                         goto out;
194                 files++;
195         }
196         return 0;
197 out:
198         /*
199          * remove all children from dir. dir->inode is not set so don't
200          * just simply use spufs_prune_dir() and panic afterwards :)
201          * dput() looks like it will do the right thing:
202          * - dec parent's ref counter
203          * - remove child from parent's child list
204          * - free child's inode if possible
205          * - free child
206          */
207         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
208                 dput(dentry);
209         }
210
211         shrink_dcache_parent(dir);
212         return ret;
213 }
214
215 static int spufs_dir_close(struct inode *inode, struct file *file)
216 {
217         struct spu_context *ctx;
218         struct inode *parent;
219         struct dentry *dir;
220         int ret;
221
222         dir = file->f_path.dentry;
223         parent = dir->d_parent->d_inode;
224         ctx = SPUFS_I(dir->d_inode)->i_ctx;
225
226         mutex_lock(&parent->i_mutex);
227         ret = spufs_rmdir(parent, dir);
228         mutex_unlock(&parent->i_mutex);
229         WARN_ON(ret);
230
231         /* We have to give up the mm_struct */
232         spu_forget(ctx);
233
234         return dcache_dir_close(inode, file);
235 }
236
237 const struct file_operations spufs_context_fops = {
238         .open           = dcache_dir_open,
239         .release        = spufs_dir_close,
240         .llseek         = dcache_dir_lseek,
241         .read           = generic_read_dir,
242         .readdir        = dcache_readdir,
243         .fsync          = simple_sync_file,
244 };
245 EXPORT_SYMBOL_GPL(spufs_context_fops);
246
247 static int
248 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
249                 int mode)
250 {
251         int ret;
252         struct inode *inode;
253         struct spu_context *ctx;
254
255         ret = -ENOSPC;
256         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
257         if (!inode)
258                 goto out;
259
260         if (dir->i_mode & S_ISGID) {
261                 inode->i_gid = dir->i_gid;
262                 inode->i_mode &= S_ISGID;
263         }
264         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
265         SPUFS_I(inode)->i_ctx = ctx;
266         if (!ctx)
267                 goto out_iput;
268
269         ctx->flags = flags;
270         inode->i_op = &simple_dir_inode_operations;
271         inode->i_fop = &simple_dir_operations;
272         if (flags & SPU_CREATE_NOSCHED)
273                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
274                                          mode, ctx);
275         else
276                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
277
278         if (ret)
279                 goto out_free_ctx;
280
281         d_instantiate(dentry, inode);
282         dget(dentry);
283         dir->i_nlink++;
284         dentry->d_inode->i_nlink++;
285         goto out;
286
287 out_free_ctx:
288         spu_forget(ctx);
289         put_spu_context(ctx);
290 out_iput:
291         iput(inode);
292 out:
293         return ret;
294 }
295
296 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
297 {
298         int ret;
299         struct file *filp;
300
301         ret = get_unused_fd();
302         if (ret < 0) {
303                 dput(dentry);
304                 mntput(mnt);
305                 goto out;
306         }
307
308         filp = dentry_open(dentry, mnt, O_RDONLY);
309         if (IS_ERR(filp)) {
310                 put_unused_fd(ret);
311                 ret = PTR_ERR(filp);
312                 goto out;
313         }
314
315         filp->f_op = &spufs_context_fops;
316         fd_install(ret, filp);
317 out:
318         return ret;
319 }
320
321 static struct spu_context *
322 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
323                                                 struct file *filp)
324 {
325         struct spu_context *tmp, *neighbor, *err;
326         int count, node;
327         int aff_supp;
328
329         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
330                                         struct spu, cbe_list))->aff_list);
331
332         if (!aff_supp)
333                 return ERR_PTR(-EINVAL);
334
335         if (flags & SPU_CREATE_GANG)
336                 return ERR_PTR(-EINVAL);
337
338         if (flags & SPU_CREATE_AFFINITY_MEM &&
339             gang->aff_ref_ctx &&
340             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
341                 return ERR_PTR(-EEXIST);
342
343         if (gang->aff_flags & AFF_MERGED)
344                 return ERR_PTR(-EBUSY);
345
346         neighbor = NULL;
347         if (flags & SPU_CREATE_AFFINITY_SPU) {
348                 if (!filp || filp->f_op != &spufs_context_fops)
349                         return ERR_PTR(-EINVAL);
350
351                 neighbor = get_spu_context(
352                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
353
354                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
355                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
356                     !list_entry(neighbor->aff_list.next, struct spu_context,
357                     aff_list)->aff_head) {
358                         err = ERR_PTR(-EEXIST);
359                         goto out_put_neighbor;
360                 }
361
362                 if (gang != neighbor->gang) {
363                         err = ERR_PTR(-EINVAL);
364                         goto out_put_neighbor;
365                 }
366
367                 count = 1;
368                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
369                         count++;
370                 if (list_empty(&neighbor->aff_list))
371                         count++;
372
373                 for (node = 0; node < MAX_NUMNODES; node++) {
374                         if ((cbe_spu_info[node].n_spus - atomic_read(
375                                 &cbe_spu_info[node].reserved_spus)) >= count)
376                                 break;
377                 }
378
379                 if (node == MAX_NUMNODES) {
380                         err = ERR_PTR(-EEXIST);
381                         goto out_put_neighbor;
382                 }
383         }
384
385         return neighbor;
386
387 out_put_neighbor:
388         put_spu_context(neighbor);
389         return err;
390 }
391
392 static void
393 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
394                                         struct spu_context *neighbor)
395 {
396         if (flags & SPU_CREATE_AFFINITY_MEM)
397                 ctx->gang->aff_ref_ctx = ctx;
398
399         if (flags & SPU_CREATE_AFFINITY_SPU) {
400                 if (list_empty(&neighbor->aff_list)) {
401                         list_add_tail(&neighbor->aff_list,
402                                 &ctx->gang->aff_list_head);
403                         neighbor->aff_head = 1;
404                 }
405
406                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
407                     || list_entry(neighbor->aff_list.next, struct spu_context,
408                                                         aff_list)->aff_head) {
409                         list_add(&ctx->aff_list, &neighbor->aff_list);
410                 } else  {
411                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
412                         if (neighbor->aff_head) {
413                                 neighbor->aff_head = 0;
414                                 ctx->aff_head = 1;
415                         }
416                 }
417
418                 if (!ctx->gang->aff_ref_ctx)
419                         ctx->gang->aff_ref_ctx = ctx;
420         }
421 }
422
423 static int
424 spufs_create_context(struct inode *inode, struct dentry *dentry,
425                         struct vfsmount *mnt, int flags, int mode,
426                         struct file *aff_filp)
427 {
428         int ret;
429         int affinity;
430         struct spu_gang *gang;
431         struct spu_context *neighbor;
432
433         ret = -EPERM;
434         if ((flags & SPU_CREATE_NOSCHED) &&
435             !capable(CAP_SYS_NICE))
436                 goto out_unlock;
437
438         ret = -EINVAL;
439         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
440             == SPU_CREATE_ISOLATE)
441                 goto out_unlock;
442
443         ret = -ENODEV;
444         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
445                 goto out_unlock;
446
447         gang = NULL;
448         neighbor = NULL;
449         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
450         if (affinity) {
451                 gang = SPUFS_I(inode)->i_gang;
452                 ret = -EINVAL;
453                 if (!gang)
454                         goto out_unlock;
455                 mutex_lock(&gang->aff_mutex);
456                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
457                 if (IS_ERR(neighbor)) {
458                         ret = PTR_ERR(neighbor);
459                         goto out_aff_unlock;
460                 }
461         }
462
463         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
464         if (ret)
465                 goto out_aff_unlock;
466
467         if (affinity) {
468                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
469                                                                 neighbor);
470                 if (neighbor)
471                         put_spu_context(neighbor);
472         }
473
474         /*
475          * get references for dget and mntget, will be released
476          * in error path of *_open().
477          */
478         ret = spufs_context_open(dget(dentry), mntget(mnt));
479         if (ret < 0) {
480                 WARN_ON(spufs_rmdir(inode, dentry));
481                 mutex_unlock(&inode->i_mutex);
482                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
483                 goto out;
484         }
485
486 out_aff_unlock:
487         if (affinity)
488                 mutex_unlock(&gang->aff_mutex);
489 out_unlock:
490         mutex_unlock(&inode->i_mutex);
491 out:
492         dput(dentry);
493         return ret;
494 }
495
496 static int
497 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
498 {
499         int ret;
500         struct inode *inode;
501         struct spu_gang *gang;
502
503         ret = -ENOSPC;
504         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
505         if (!inode)
506                 goto out;
507
508         ret = 0;
509         if (dir->i_mode & S_ISGID) {
510                 inode->i_gid = dir->i_gid;
511                 inode->i_mode &= S_ISGID;
512         }
513         gang = alloc_spu_gang();
514         SPUFS_I(inode)->i_ctx = NULL;
515         SPUFS_I(inode)->i_gang = gang;
516         if (!gang)
517                 goto out_iput;
518
519         inode->i_op = &simple_dir_inode_operations;
520         inode->i_fop = &simple_dir_operations;
521
522         d_instantiate(dentry, inode);
523         dir->i_nlink++;
524         dentry->d_inode->i_nlink++;
525         return ret;
526
527 out_iput:
528         iput(inode);
529 out:
530         return ret;
531 }
532
533 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
534 {
535         int ret;
536         struct file *filp;
537
538         ret = get_unused_fd();
539         if (ret < 0) {
540                 dput(dentry);
541                 mntput(mnt);
542                 goto out;
543         }
544
545         filp = dentry_open(dentry, mnt, O_RDONLY);
546         if (IS_ERR(filp)) {
547                 put_unused_fd(ret);
548                 ret = PTR_ERR(filp);
549                 goto out;
550         }
551
552         filp->f_op = &simple_dir_operations;
553         fd_install(ret, filp);
554 out:
555         return ret;
556 }
557
558 static int spufs_create_gang(struct inode *inode,
559                         struct dentry *dentry,
560                         struct vfsmount *mnt, int mode)
561 {
562         int ret;
563
564         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
565         if (ret)
566                 goto out;
567
568         /*
569          * get references for dget and mntget, will be released
570          * in error path of *_open().
571          */
572         ret = spufs_gang_open(dget(dentry), mntget(mnt));
573         if (ret < 0) {
574                 int err = simple_rmdir(inode, dentry);
575                 WARN_ON(err);
576         }
577
578 out:
579         mutex_unlock(&inode->i_mutex);
580         dput(dentry);
581         return ret;
582 }
583
584
585 static struct file_system_type spufs_type;
586
587 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
588                                                         struct file *filp)
589 {
590         struct dentry *dentry;
591         int ret;
592
593         ret = -EINVAL;
594         /* check if we are on spufs */
595         if (nd->path.dentry->d_sb->s_type != &spufs_type)
596                 goto out;
597
598         /* don't accept undefined flags */
599         if (flags & (~SPU_CREATE_FLAG_ALL))
600                 goto out;
601
602         /* only threads can be underneath a gang */
603         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
604                 if ((flags & SPU_CREATE_GANG) ||
605                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
606                         goto out;
607         }
608
609         dentry = lookup_create(nd, 1);
610         ret = PTR_ERR(dentry);
611         if (IS_ERR(dentry))
612                 goto out_dir;
613
614         ret = -EEXIST;
615         if (dentry->d_inode)
616                 goto out_dput;
617
618         mode &= ~current->fs->umask;
619
620         if (flags & SPU_CREATE_GANG)
621                 return spufs_create_gang(nd->path.dentry->d_inode,
622                                          dentry, nd->path.mnt, mode);
623         else
624                 return spufs_create_context(nd->path.dentry->d_inode,
625                                             dentry, nd->path.mnt, flags, mode,
626                                             filp);
627
628 out_dput:
629         dput(dentry);
630 out_dir:
631         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
632 out:
633         return ret;
634 }
635
636 /* File system initialization */
637 enum {
638         Opt_uid, Opt_gid, Opt_mode, Opt_err,
639 };
640
641 static match_table_t spufs_tokens = {
642         { Opt_uid,  "uid=%d" },
643         { Opt_gid,  "gid=%d" },
644         { Opt_mode, "mode=%o" },
645         { Opt_err,   NULL  },
646 };
647
648 static int
649 spufs_parse_options(char *options, struct inode *root)
650 {
651         char *p;
652         substring_t args[MAX_OPT_ARGS];
653
654         while ((p = strsep(&options, ",")) != NULL) {
655                 int token, option;
656
657                 if (!*p)
658                         continue;
659
660                 token = match_token(p, spufs_tokens, args);
661                 switch (token) {
662                 case Opt_uid:
663                         if (match_int(&args[0], &option))
664                                 return 0;
665                         root->i_uid = option;
666                         break;
667                 case Opt_gid:
668                         if (match_int(&args[0], &option))
669                                 return 0;
670                         root->i_gid = option;
671                         break;
672                 case Opt_mode:
673                         if (match_octal(&args[0], &option))
674                                 return 0;
675                         root->i_mode = option | S_IFDIR;
676                         break;
677                 default:
678                         return 0;
679                 }
680         }
681         return 1;
682 }
683
684 static void spufs_exit_isolated_loader(void)
685 {
686         free_pages((unsigned long) isolated_loader,
687                         get_order(isolated_loader_size));
688 }
689
690 static void
691 spufs_init_isolated_loader(void)
692 {
693         struct device_node *dn;
694         const char *loader;
695         int size;
696
697         dn = of_find_node_by_path("/spu-isolation");
698         if (!dn)
699                 return;
700
701         loader = of_get_property(dn, "loader", &size);
702         if (!loader)
703                 return;
704
705         /* the loader must be align on a 16 byte boundary */
706         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
707         if (!isolated_loader)
708                 return;
709
710         isolated_loader_size = size;
711         memcpy(isolated_loader, loader, size);
712         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
713 }
714
715 static int
716 spufs_create_root(struct super_block *sb, void *data)
717 {
718         struct inode *inode;
719         int ret;
720
721         ret = -ENODEV;
722         if (!spu_management_ops)
723                 goto out;
724
725         ret = -ENOMEM;
726         inode = spufs_new_inode(sb, S_IFDIR | 0775);
727         if (!inode)
728                 goto out;
729
730         inode->i_op = &simple_dir_inode_operations;
731         inode->i_fop = &simple_dir_operations;
732         SPUFS_I(inode)->i_ctx = NULL;
733
734         ret = -EINVAL;
735         if (!spufs_parse_options(data, inode))
736                 goto out_iput;
737
738         ret = -ENOMEM;
739         sb->s_root = d_alloc_root(inode);
740         if (!sb->s_root)
741                 goto out_iput;
742
743         return 0;
744 out_iput:
745         iput(inode);
746 out:
747         return ret;
748 }
749
750 static int
751 spufs_fill_super(struct super_block *sb, void *data, int silent)
752 {
753         static struct super_operations s_ops = {
754                 .alloc_inode = spufs_alloc_inode,
755                 .destroy_inode = spufs_destroy_inode,
756                 .statfs = simple_statfs,
757                 .delete_inode = spufs_delete_inode,
758                 .drop_inode = generic_delete_inode,
759                 .show_options = generic_show_options,
760         };
761
762         save_mount_options(sb, data);
763
764         sb->s_maxbytes = MAX_LFS_FILESIZE;
765         sb->s_blocksize = PAGE_CACHE_SIZE;
766         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
767         sb->s_magic = SPUFS_MAGIC;
768         sb->s_op = &s_ops;
769
770         return spufs_create_root(sb, data);
771 }
772
773 static int
774 spufs_get_sb(struct file_system_type *fstype, int flags,
775                 const char *name, void *data, struct vfsmount *mnt)
776 {
777         return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
778 }
779
780 static struct file_system_type spufs_type = {
781         .owner = THIS_MODULE,
782         .name = "spufs",
783         .get_sb = spufs_get_sb,
784         .kill_sb = kill_litter_super,
785 };
786
787 static int __init spufs_init(void)
788 {
789         int ret;
790
791         ret = -ENODEV;
792         if (!spu_management_ops)
793                 goto out;
794
795         ret = -ENOMEM;
796         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
797                         sizeof(struct spufs_inode_info), 0,
798                         SLAB_HWCACHE_ALIGN, spufs_init_once);
799
800         if (!spufs_inode_cache)
801                 goto out;
802         ret = spu_sched_init();
803         if (ret)
804                 goto out_cache;
805         ret = register_filesystem(&spufs_type);
806         if (ret)
807                 goto out_sched;
808         ret = register_spu_syscalls(&spufs_calls);
809         if (ret)
810                 goto out_fs;
811
812         spufs_init_isolated_loader();
813
814         return 0;
815
816 out_fs:
817         unregister_filesystem(&spufs_type);
818 out_sched:
819         spu_sched_exit();
820 out_cache:
821         kmem_cache_destroy(spufs_inode_cache);
822 out:
823         return ret;
824 }
825 module_init(spufs_init);
826
827 static void __exit spufs_exit(void)
828 {
829         spu_sched_exit();
830         spufs_exit_isolated_loader();
831         unregister_spu_syscalls(&spufs_calls);
832         unregister_filesystem(&spufs_type);
833         kmem_cache_destroy(spufs_inode_cache);
834 }
835 module_exit(spufs_exit);
836
837 MODULE_LICENSE("GPL");
838 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
839