Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-linus
[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/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
45 static struct kmem_cache *spufs_inode_cache;
46 char *isolated_loader;
47 static int isolated_loader_size;
48
49 static struct inode *
50 spufs_alloc_inode(struct super_block *sb)
51 {
52         struct spufs_inode_info *ei;
53
54         ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
55         if (!ei)
56                 return NULL;
57
58         ei->i_gang = NULL;
59         ei->i_ctx = NULL;
60         ei->i_openers = 0;
61
62         return &ei->vfs_inode;
63 }
64
65 static void
66 spufs_destroy_inode(struct inode *inode)
67 {
68         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
69 }
70
71 static void
72 spufs_init_once(struct kmem_cache *cachep, void *p)
73 {
74         struct spufs_inode_info *ei = p;
75
76         inode_init_once(&ei->vfs_inode);
77 }
78
79 static struct inode *
80 spufs_new_inode(struct super_block *sb, int mode)
81 {
82         struct inode *inode;
83
84         inode = new_inode(sb);
85         if (!inode)
86                 goto out;
87
88         inode->i_mode = mode;
89         inode->i_uid = current->fsuid;
90         inode->i_gid = current->fsgid;
91         inode->i_blocks = 0;
92         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
93 out:
94         return inode;
95 }
96
97 static int
98 spufs_setattr(struct dentry *dentry, struct iattr *attr)
99 {
100         struct inode *inode = dentry->d_inode;
101
102         if ((attr->ia_valid & ATTR_SIZE) &&
103             (attr->ia_size != inode->i_size))
104                 return -EINVAL;
105         return inode_setattr(inode, attr);
106 }
107
108
109 static int
110 spufs_new_file(struct super_block *sb, struct dentry *dentry,
111                 const struct file_operations *fops, int mode,
112                 struct spu_context *ctx)
113 {
114         static 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_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
129         d_add(dentry, inode);
130 out:
131         return ret;
132 }
133
134 static void
135 spufs_delete_inode(struct inode *inode)
136 {
137         struct spufs_inode_info *ei = SPUFS_I(inode);
138
139         if (ei->i_ctx)
140                 put_spu_context(ei->i_ctx);
141         if (ei->i_gang)
142                 put_spu_gang(ei->i_gang);
143         clear_inode(inode);
144 }
145
146 static void spufs_prune_dir(struct dentry *dir)
147 {
148         struct dentry *dentry, *tmp;
149
150         mutex_lock(&dir->d_inode->i_mutex);
151         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
152                 spin_lock(&dcache_lock);
153                 spin_lock(&dentry->d_lock);
154                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
155                         dget_locked(dentry);
156                         __d_drop(dentry);
157                         spin_unlock(&dentry->d_lock);
158                         simple_unlink(dir->d_inode, dentry);
159                         spin_unlock(&dcache_lock);
160                         dput(dentry);
161                 } else {
162                         spin_unlock(&dentry->d_lock);
163                         spin_unlock(&dcache_lock);
164                 }
165         }
166         shrink_dcache_parent(dir);
167         mutex_unlock(&dir->d_inode->i_mutex);
168 }
169
170 /* Caller must hold parent->i_mutex */
171 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
172 {
173         /* remove all entries */
174         spufs_prune_dir(dir);
175         d_drop(dir);
176
177         return simple_rmdir(parent, dir);
178 }
179
180 static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
181                           int mode, struct spu_context *ctx)
182 {
183         struct dentry *dentry, *tmp;
184         int ret;
185
186         while (files->name && files->name[0]) {
187                 ret = -ENOMEM;
188                 dentry = d_alloc_name(dir, files->name);
189                 if (!dentry)
190                         goto out;
191                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
192                                         files->mode & mode, ctx);
193                 if (ret)
194                         goto out;
195                 files++;
196         }
197         return 0;
198 out:
199         /*
200          * remove all children from dir. dir->inode is not set so don't
201          * just simply use spufs_prune_dir() and panic afterwards :)
202          * dput() looks like it will do the right thing:
203          * - dec parent's ref counter
204          * - remove child from parent's child list
205          * - free child's inode if possible
206          * - free child
207          */
208         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
209                 dput(dentry);
210         }
211
212         shrink_dcache_parent(dir);
213         return ret;
214 }
215
216 static int spufs_dir_close(struct inode *inode, struct file *file)
217 {
218         struct spu_context *ctx;
219         struct inode *parent;
220         struct dentry *dir;
221         int ret;
222
223         dir = file->f_path.dentry;
224         parent = dir->d_parent->d_inode;
225         ctx = SPUFS_I(dir->d_inode)->i_ctx;
226
227         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
228         ret = spufs_rmdir(parent, dir);
229         mutex_unlock(&parent->i_mutex);
230         WARN_ON(ret);
231
232         /* We have to give up the mm_struct */
233         spu_forget(ctx);
234
235         return dcache_dir_close(inode, file);
236 }
237
238 const struct file_operations spufs_context_fops = {
239         .open           = dcache_dir_open,
240         .release        = spufs_dir_close,
241         .llseek         = dcache_dir_lseek,
242         .read           = generic_read_dir,
243         .readdir        = dcache_readdir,
244         .fsync          = simple_sync_file,
245 };
246 EXPORT_SYMBOL_GPL(spufs_context_fops);
247
248 static int
249 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
250                 int mode)
251 {
252         int ret;
253         struct inode *inode;
254         struct spu_context *ctx;
255
256         ret = -ENOSPC;
257         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
258         if (!inode)
259                 goto out;
260
261         if (dir->i_mode & S_ISGID) {
262                 inode->i_gid = dir->i_gid;
263                 inode->i_mode &= S_ISGID;
264         }
265         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
266         SPUFS_I(inode)->i_ctx = ctx;
267         if (!ctx)
268                 goto out_iput;
269
270         ctx->flags = flags;
271         inode->i_op = &simple_dir_inode_operations;
272         inode->i_fop = &simple_dir_operations;
273         if (flags & SPU_CREATE_NOSCHED)
274                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
275                                          mode, ctx);
276         else
277                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
278
279         if (ret)
280                 goto out_free_ctx;
281
282         d_instantiate(dentry, inode);
283         dget(dentry);
284         dir->i_nlink++;
285         dentry->d_inode->i_nlink++;
286         goto out;
287
288 out_free_ctx:
289         spu_forget(ctx);
290         put_spu_context(ctx);
291 out_iput:
292         iput(inode);
293 out:
294         return ret;
295 }
296
297 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
298 {
299         int ret;
300         struct file *filp;
301
302         ret = get_unused_fd();
303         if (ret < 0) {
304                 dput(dentry);
305                 mntput(mnt);
306                 goto out;
307         }
308
309         filp = dentry_open(dentry, mnt, O_RDONLY);
310         if (IS_ERR(filp)) {
311                 put_unused_fd(ret);
312                 ret = PTR_ERR(filp);
313                 goto out;
314         }
315
316         filp->f_op = &spufs_context_fops;
317         fd_install(ret, filp);
318 out:
319         return ret;
320 }
321
322 static struct spu_context *
323 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
324                                                 struct file *filp)
325 {
326         struct spu_context *tmp, *neighbor, *err;
327         int count, node;
328         int aff_supp;
329
330         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
331                                         struct spu, cbe_list))->aff_list);
332
333         if (!aff_supp)
334                 return ERR_PTR(-EINVAL);
335
336         if (flags & SPU_CREATE_GANG)
337                 return ERR_PTR(-EINVAL);
338
339         if (flags & SPU_CREATE_AFFINITY_MEM &&
340             gang->aff_ref_ctx &&
341             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
342                 return ERR_PTR(-EEXIST);
343
344         if (gang->aff_flags & AFF_MERGED)
345                 return ERR_PTR(-EBUSY);
346
347         neighbor = NULL;
348         if (flags & SPU_CREATE_AFFINITY_SPU) {
349                 if (!filp || filp->f_op != &spufs_context_fops)
350                         return ERR_PTR(-EINVAL);
351
352                 neighbor = get_spu_context(
353                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
354
355                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
356                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
357                     !list_entry(neighbor->aff_list.next, struct spu_context,
358                     aff_list)->aff_head) {
359                         err = ERR_PTR(-EEXIST);
360                         goto out_put_neighbor;
361                 }
362
363                 if (gang != neighbor->gang) {
364                         err = ERR_PTR(-EINVAL);
365                         goto out_put_neighbor;
366                 }
367
368                 count = 1;
369                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
370                         count++;
371                 if (list_empty(&neighbor->aff_list))
372                         count++;
373
374                 for (node = 0; node < MAX_NUMNODES; node++) {
375                         if ((cbe_spu_info[node].n_spus - atomic_read(
376                                 &cbe_spu_info[node].reserved_spus)) >= count)
377                                 break;
378                 }
379
380                 if (node == MAX_NUMNODES) {
381                         err = ERR_PTR(-EEXIST);
382                         goto out_put_neighbor;
383                 }
384         }
385
386         return neighbor;
387
388 out_put_neighbor:
389         put_spu_context(neighbor);
390         return err;
391 }
392
393 static void
394 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
395                                         struct spu_context *neighbor)
396 {
397         if (flags & SPU_CREATE_AFFINITY_MEM)
398                 ctx->gang->aff_ref_ctx = ctx;
399
400         if (flags & SPU_CREATE_AFFINITY_SPU) {
401                 if (list_empty(&neighbor->aff_list)) {
402                         list_add_tail(&neighbor->aff_list,
403                                 &ctx->gang->aff_list_head);
404                         neighbor->aff_head = 1;
405                 }
406
407                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
408                     || list_entry(neighbor->aff_list.next, struct spu_context,
409                                                         aff_list)->aff_head) {
410                         list_add(&ctx->aff_list, &neighbor->aff_list);
411                 } else  {
412                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
413                         if (neighbor->aff_head) {
414                                 neighbor->aff_head = 0;
415                                 ctx->aff_head = 1;
416                         }
417                 }
418
419                 if (!ctx->gang->aff_ref_ctx)
420                         ctx->gang->aff_ref_ctx = ctx;
421         }
422 }
423
424 static int
425 spufs_create_context(struct inode *inode, struct dentry *dentry,
426                         struct vfsmount *mnt, int flags, int mode,
427                         struct file *aff_filp)
428 {
429         int ret;
430         int affinity;
431         struct spu_gang *gang;
432         struct spu_context *neighbor;
433
434         ret = -EPERM;
435         if ((flags & SPU_CREATE_NOSCHED) &&
436             !capable(CAP_SYS_NICE))
437                 goto out_unlock;
438
439         ret = -EINVAL;
440         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
441             == SPU_CREATE_ISOLATE)
442                 goto out_unlock;
443
444         ret = -ENODEV;
445         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
446                 goto out_unlock;
447
448         gang = NULL;
449         neighbor = NULL;
450         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
451         if (affinity) {
452                 gang = SPUFS_I(inode)->i_gang;
453                 ret = -EINVAL;
454                 if (!gang)
455                         goto out_unlock;
456                 mutex_lock(&gang->aff_mutex);
457                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
458                 if (IS_ERR(neighbor)) {
459                         ret = PTR_ERR(neighbor);
460                         goto out_aff_unlock;
461                 }
462         }
463
464         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
465         if (ret)
466                 goto out_aff_unlock;
467
468         if (affinity) {
469                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
470                                                                 neighbor);
471                 if (neighbor)
472                         put_spu_context(neighbor);
473         }
474
475         /*
476          * get references for dget and mntget, will be released
477          * in error path of *_open().
478          */
479         ret = spufs_context_open(dget(dentry), mntget(mnt));
480         if (ret < 0) {
481                 WARN_ON(spufs_rmdir(inode, dentry));
482                 mutex_unlock(&inode->i_mutex);
483                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
484                 goto out;
485         }
486
487 out_aff_unlock:
488         if (affinity)
489                 mutex_unlock(&gang->aff_mutex);
490 out_unlock:
491         mutex_unlock(&inode->i_mutex);
492 out:
493         dput(dentry);
494         return ret;
495 }
496
497 static int
498 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
499 {
500         int ret;
501         struct inode *inode;
502         struct spu_gang *gang;
503
504         ret = -ENOSPC;
505         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
506         if (!inode)
507                 goto out;
508
509         ret = 0;
510         if (dir->i_mode & S_ISGID) {
511                 inode->i_gid = dir->i_gid;
512                 inode->i_mode &= S_ISGID;
513         }
514         gang = alloc_spu_gang();
515         SPUFS_I(inode)->i_ctx = NULL;
516         SPUFS_I(inode)->i_gang = gang;
517         if (!gang)
518                 goto out_iput;
519
520         inode->i_op = &simple_dir_inode_operations;
521         inode->i_fop = &simple_dir_operations;
522
523         d_instantiate(dentry, inode);
524         dir->i_nlink++;
525         dentry->d_inode->i_nlink++;
526         return ret;
527
528 out_iput:
529         iput(inode);
530 out:
531         return ret;
532 }
533
534 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
535 {
536         int ret;
537         struct file *filp;
538
539         ret = get_unused_fd();
540         if (ret < 0) {
541                 dput(dentry);
542                 mntput(mnt);
543                 goto out;
544         }
545
546         filp = dentry_open(dentry, mnt, O_RDONLY);
547         if (IS_ERR(filp)) {
548                 put_unused_fd(ret);
549                 ret = PTR_ERR(filp);
550                 goto out;
551         }
552
553         filp->f_op = &simple_dir_operations;
554         fd_install(ret, filp);
555 out:
556         return ret;
557 }
558
559 static int spufs_create_gang(struct inode *inode,
560                         struct dentry *dentry,
561                         struct vfsmount *mnt, int mode)
562 {
563         int ret;
564
565         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
566         if (ret)
567                 goto out;
568
569         /*
570          * get references for dget and mntget, will be released
571          * in error path of *_open().
572          */
573         ret = spufs_gang_open(dget(dentry), mntget(mnt));
574         if (ret < 0) {
575                 int err = simple_rmdir(inode, dentry);
576                 WARN_ON(err);
577         }
578
579 out:
580         mutex_unlock(&inode->i_mutex);
581         dput(dentry);
582         return ret;
583 }
584
585
586 static struct file_system_type spufs_type;
587
588 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
589                                                         struct file *filp)
590 {
591         struct dentry *dentry;
592         int ret;
593
594         ret = -EINVAL;
595         /* check if we are on spufs */
596         if (nd->path.dentry->d_sb->s_type != &spufs_type)
597                 goto out;
598
599         /* don't accept undefined flags */
600         if (flags & (~SPU_CREATE_FLAG_ALL))
601                 goto out;
602
603         /* only threads can be underneath a gang */
604         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
605                 if ((flags & SPU_CREATE_GANG) ||
606                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
607                         goto out;
608         }
609
610         dentry = lookup_create(nd, 1);
611         ret = PTR_ERR(dentry);
612         if (IS_ERR(dentry))
613                 goto out_dir;
614
615         ret = -EEXIST;
616         if (dentry->d_inode)
617                 goto out_dput;
618
619         mode &= ~current->fs->umask;
620
621         if (flags & SPU_CREATE_GANG)
622                 ret = spufs_create_gang(nd->path.dentry->d_inode,
623                                          dentry, nd->path.mnt, mode);
624         else
625                 ret = spufs_create_context(nd->path.dentry->d_inode,
626                                             dentry, nd->path.mnt, flags, mode,
627                                             filp);
628         if (ret >= 0)
629                 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
630         return ret;
631
632 out_dput:
633         dput(dentry);
634 out_dir:
635         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
636 out:
637         return ret;
638 }
639
640 /* File system initialization */
641 enum {
642         Opt_uid, Opt_gid, Opt_mode, Opt_err,
643 };
644
645 static match_table_t spufs_tokens = {
646         { Opt_uid,  "uid=%d" },
647         { Opt_gid,  "gid=%d" },
648         { Opt_mode, "mode=%o" },
649         { Opt_err,   NULL  },
650 };
651
652 static int
653 spufs_parse_options(char *options, struct inode *root)
654 {
655         char *p;
656         substring_t args[MAX_OPT_ARGS];
657
658         while ((p = strsep(&options, ",")) != NULL) {
659                 int token, option;
660
661                 if (!*p)
662                         continue;
663
664                 token = match_token(p, spufs_tokens, args);
665                 switch (token) {
666                 case Opt_uid:
667                         if (match_int(&args[0], &option))
668                                 return 0;
669                         root->i_uid = option;
670                         break;
671                 case Opt_gid:
672                         if (match_int(&args[0], &option))
673                                 return 0;
674                         root->i_gid = option;
675                         break;
676                 case Opt_mode:
677                         if (match_octal(&args[0], &option))
678                                 return 0;
679                         root->i_mode = option | S_IFDIR;
680                         break;
681                 default:
682                         return 0;
683                 }
684         }
685         return 1;
686 }
687
688 static void spufs_exit_isolated_loader(void)
689 {
690         free_pages((unsigned long) isolated_loader,
691                         get_order(isolated_loader_size));
692 }
693
694 static void
695 spufs_init_isolated_loader(void)
696 {
697         struct device_node *dn;
698         const char *loader;
699         int size;
700
701         dn = of_find_node_by_path("/spu-isolation");
702         if (!dn)
703                 return;
704
705         loader = of_get_property(dn, "loader", &size);
706         if (!loader)
707                 return;
708
709         /* the loader must be align on a 16 byte boundary */
710         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
711         if (!isolated_loader)
712                 return;
713
714         isolated_loader_size = size;
715         memcpy(isolated_loader, loader, size);
716         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
717 }
718
719 static int
720 spufs_create_root(struct super_block *sb, void *data)
721 {
722         struct inode *inode;
723         int ret;
724
725         ret = -ENODEV;
726         if (!spu_management_ops)
727                 goto out;
728
729         ret = -ENOMEM;
730         inode = spufs_new_inode(sb, S_IFDIR | 0775);
731         if (!inode)
732                 goto out;
733
734         inode->i_op = &simple_dir_inode_operations;
735         inode->i_fop = &simple_dir_operations;
736         SPUFS_I(inode)->i_ctx = NULL;
737
738         ret = -EINVAL;
739         if (!spufs_parse_options(data, inode))
740                 goto out_iput;
741
742         ret = -ENOMEM;
743         sb->s_root = d_alloc_root(inode);
744         if (!sb->s_root)
745                 goto out_iput;
746
747         return 0;
748 out_iput:
749         iput(inode);
750 out:
751         return ret;
752 }
753
754 static int
755 spufs_fill_super(struct super_block *sb, void *data, int silent)
756 {
757         static struct super_operations s_ops = {
758                 .alloc_inode = spufs_alloc_inode,
759                 .destroy_inode = spufs_destroy_inode,
760                 .statfs = simple_statfs,
761                 .delete_inode = spufs_delete_inode,
762                 .drop_inode = generic_delete_inode,
763                 .show_options = generic_show_options,
764         };
765
766         save_mount_options(sb, data);
767
768         sb->s_maxbytes = MAX_LFS_FILESIZE;
769         sb->s_blocksize = PAGE_CACHE_SIZE;
770         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
771         sb->s_magic = SPUFS_MAGIC;
772         sb->s_op = &s_ops;
773
774         return spufs_create_root(sb, data);
775 }
776
777 static int
778 spufs_get_sb(struct file_system_type *fstype, int flags,
779                 const char *name, void *data, struct vfsmount *mnt)
780 {
781         return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
782 }
783
784 static struct file_system_type spufs_type = {
785         .owner = THIS_MODULE,
786         .name = "spufs",
787         .get_sb = spufs_get_sb,
788         .kill_sb = kill_litter_super,
789 };
790
791 static int __init spufs_init(void)
792 {
793         int ret;
794
795         ret = -ENODEV;
796         if (!spu_management_ops)
797                 goto out;
798
799         ret = -ENOMEM;
800         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
801                         sizeof(struct spufs_inode_info), 0,
802                         SLAB_HWCACHE_ALIGN, spufs_init_once);
803
804         if (!spufs_inode_cache)
805                 goto out;
806         ret = spu_sched_init();
807         if (ret)
808                 goto out_cache;
809         ret = register_filesystem(&spufs_type);
810         if (ret)
811                 goto out_sched;
812         ret = register_spu_syscalls(&spufs_calls);
813         if (ret)
814                 goto out_fs;
815
816         spufs_init_isolated_loader();
817
818         return 0;
819
820 out_fs:
821         unregister_filesystem(&spufs_type);
822 out_sched:
823         spu_sched_exit();
824 out_cache:
825         kmem_cache_destroy(spufs_inode_cache);
826 out:
827         return ret;
828 }
829 module_init(spufs_init);
830
831 static void __exit spufs_exit(void)
832 {
833         spu_sched_exit();
834         spufs_exit_isolated_loader();
835         unregister_spu_syscalls(&spufs_calls);
836         unregister_filesystem(&spufs_type);
837         kmem_cache_destroy(spufs_inode_cache);
838 }
839 module_exit(spufs_exit);
840
841 MODULE_LICENSE("GPL");
842 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
843