CRED: Wrap task credential accesses in the PowerPC arch
[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 struct spufs_sb_info {
46         int debug;
47 };
48
49 static struct kmem_cache *spufs_inode_cache;
50 char *isolated_loader;
51 static int isolated_loader_size;
52
53 static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
54 {
55         return sb->s_fs_info;
56 }
57
58 static struct inode *
59 spufs_alloc_inode(struct super_block *sb)
60 {
61         struct spufs_inode_info *ei;
62
63         ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
64         if (!ei)
65                 return NULL;
66
67         ei->i_gang = NULL;
68         ei->i_ctx = NULL;
69         ei->i_openers = 0;
70
71         return &ei->vfs_inode;
72 }
73
74 static void
75 spufs_destroy_inode(struct inode *inode)
76 {
77         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
78 }
79
80 static void
81 spufs_init_once(void *p)
82 {
83         struct spufs_inode_info *ei = p;
84
85         inode_init_once(&ei->vfs_inode);
86 }
87
88 static struct inode *
89 spufs_new_inode(struct super_block *sb, int mode)
90 {
91         struct inode *inode;
92
93         inode = new_inode(sb);
94         if (!inode)
95                 goto out;
96
97         inode->i_mode = mode;
98         inode->i_uid = current_fsuid();
99         inode->i_gid = current_fsgid();
100         inode->i_blocks = 0;
101         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
102 out:
103         return inode;
104 }
105
106 static int
107 spufs_setattr(struct dentry *dentry, struct iattr *attr)
108 {
109         struct inode *inode = dentry->d_inode;
110
111         if ((attr->ia_valid & ATTR_SIZE) &&
112             (attr->ia_size != inode->i_size))
113                 return -EINVAL;
114         return inode_setattr(inode, attr);
115 }
116
117
118 static int
119 spufs_new_file(struct super_block *sb, struct dentry *dentry,
120                 const struct file_operations *fops, int mode,
121                 size_t size, struct spu_context *ctx)
122 {
123         static struct inode_operations spufs_file_iops = {
124                 .setattr = spufs_setattr,
125         };
126         struct inode *inode;
127         int ret;
128
129         ret = -ENOSPC;
130         inode = spufs_new_inode(sb, S_IFREG | mode);
131         if (!inode)
132                 goto out;
133
134         ret = 0;
135         inode->i_op = &spufs_file_iops;
136         inode->i_fop = fops;
137         inode->i_size = size;
138         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
139         d_add(dentry, inode);
140 out:
141         return ret;
142 }
143
144 static void
145 spufs_delete_inode(struct inode *inode)
146 {
147         struct spufs_inode_info *ei = SPUFS_I(inode);
148
149         if (ei->i_ctx)
150                 put_spu_context(ei->i_ctx);
151         if (ei->i_gang)
152                 put_spu_gang(ei->i_gang);
153         clear_inode(inode);
154 }
155
156 static void spufs_prune_dir(struct dentry *dir)
157 {
158         struct dentry *dentry, *tmp;
159
160         mutex_lock(&dir->d_inode->i_mutex);
161         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
162                 spin_lock(&dcache_lock);
163                 spin_lock(&dentry->d_lock);
164                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
165                         dget_locked(dentry);
166                         __d_drop(dentry);
167                         spin_unlock(&dentry->d_lock);
168                         simple_unlink(dir->d_inode, dentry);
169                         spin_unlock(&dcache_lock);
170                         dput(dentry);
171                 } else {
172                         spin_unlock(&dentry->d_lock);
173                         spin_unlock(&dcache_lock);
174                 }
175         }
176         shrink_dcache_parent(dir);
177         mutex_unlock(&dir->d_inode->i_mutex);
178 }
179
180 /* Caller must hold parent->i_mutex */
181 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
182 {
183         /* remove all entries */
184         spufs_prune_dir(dir);
185         d_drop(dir);
186
187         return simple_rmdir(parent, dir);
188 }
189
190 static int spufs_fill_dir(struct dentry *dir, struct spufs_tree_descr *files,
191                           int mode, struct spu_context *ctx)
192 {
193         struct dentry *dentry, *tmp;
194         int ret;
195
196         while (files->name && files->name[0]) {
197                 ret = -ENOMEM;
198                 dentry = d_alloc_name(dir, files->name);
199                 if (!dentry)
200                         goto out;
201                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
202                                         files->mode & mode, files->size, ctx);
203                 if (ret)
204                         goto out;
205                 files++;
206         }
207         return 0;
208 out:
209         /*
210          * remove all children from dir. dir->inode is not set so don't
211          * just simply use spufs_prune_dir() and panic afterwards :)
212          * dput() looks like it will do the right thing:
213          * - dec parent's ref counter
214          * - remove child from parent's child list
215          * - free child's inode if possible
216          * - free child
217          */
218         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
219                 dput(dentry);
220         }
221
222         shrink_dcache_parent(dir);
223         return ret;
224 }
225
226 static int spufs_dir_close(struct inode *inode, struct file *file)
227 {
228         struct spu_context *ctx;
229         struct inode *parent;
230         struct dentry *dir;
231         int ret;
232
233         dir = file->f_path.dentry;
234         parent = dir->d_parent->d_inode;
235         ctx = SPUFS_I(dir->d_inode)->i_ctx;
236
237         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
238         ret = spufs_rmdir(parent, dir);
239         mutex_unlock(&parent->i_mutex);
240         WARN_ON(ret);
241
242         /* We have to give up the mm_struct */
243         spu_forget(ctx);
244
245         return dcache_dir_close(inode, file);
246 }
247
248 const struct file_operations spufs_context_fops = {
249         .open           = dcache_dir_open,
250         .release        = spufs_dir_close,
251         .llseek         = dcache_dir_lseek,
252         .read           = generic_read_dir,
253         .readdir        = dcache_readdir,
254         .fsync          = simple_sync_file,
255 };
256 EXPORT_SYMBOL_GPL(spufs_context_fops);
257
258 static int
259 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
260                 int mode)
261 {
262         int ret;
263         struct inode *inode;
264         struct spu_context *ctx;
265
266         ret = -ENOSPC;
267         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
268         if (!inode)
269                 goto out;
270
271         if (dir->i_mode & S_ISGID) {
272                 inode->i_gid = dir->i_gid;
273                 inode->i_mode &= S_ISGID;
274         }
275         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
276         SPUFS_I(inode)->i_ctx = ctx;
277         if (!ctx)
278                 goto out_iput;
279
280         ctx->flags = flags;
281         inode->i_op = &simple_dir_inode_operations;
282         inode->i_fop = &simple_dir_operations;
283         if (flags & SPU_CREATE_NOSCHED)
284                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
285                                          mode, ctx);
286         else
287                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
288
289         if (ret)
290                 goto out_free_ctx;
291
292         if (spufs_get_sb_info(dir->i_sb)->debug)
293                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
294                                 mode, ctx);
295
296         if (ret)
297                 goto out_free_ctx;
298
299         d_instantiate(dentry, inode);
300         dget(dentry);
301         inc_nlink(dir);
302         inc_nlink(dentry->d_inode);
303         goto out;
304
305 out_free_ctx:
306         spu_forget(ctx);
307         put_spu_context(ctx);
308 out_iput:
309         iput(inode);
310 out:
311         return ret;
312 }
313
314 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
315 {
316         int ret;
317         struct file *filp;
318
319         ret = get_unused_fd();
320         if (ret < 0) {
321                 dput(dentry);
322                 mntput(mnt);
323                 goto out;
324         }
325
326         filp = dentry_open(dentry, mnt, O_RDONLY);
327         if (IS_ERR(filp)) {
328                 put_unused_fd(ret);
329                 ret = PTR_ERR(filp);
330                 goto out;
331         }
332
333         filp->f_op = &spufs_context_fops;
334         fd_install(ret, filp);
335 out:
336         return ret;
337 }
338
339 static struct spu_context *
340 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
341                                                 struct file *filp)
342 {
343         struct spu_context *tmp, *neighbor, *err;
344         int count, node;
345         int aff_supp;
346
347         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
348                                         struct spu, cbe_list))->aff_list);
349
350         if (!aff_supp)
351                 return ERR_PTR(-EINVAL);
352
353         if (flags & SPU_CREATE_GANG)
354                 return ERR_PTR(-EINVAL);
355
356         if (flags & SPU_CREATE_AFFINITY_MEM &&
357             gang->aff_ref_ctx &&
358             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
359                 return ERR_PTR(-EEXIST);
360
361         if (gang->aff_flags & AFF_MERGED)
362                 return ERR_PTR(-EBUSY);
363
364         neighbor = NULL;
365         if (flags & SPU_CREATE_AFFINITY_SPU) {
366                 if (!filp || filp->f_op != &spufs_context_fops)
367                         return ERR_PTR(-EINVAL);
368
369                 neighbor = get_spu_context(
370                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
371
372                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
373                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
374                     !list_entry(neighbor->aff_list.next, struct spu_context,
375                     aff_list)->aff_head) {
376                         err = ERR_PTR(-EEXIST);
377                         goto out_put_neighbor;
378                 }
379
380                 if (gang != neighbor->gang) {
381                         err = ERR_PTR(-EINVAL);
382                         goto out_put_neighbor;
383                 }
384
385                 count = 1;
386                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
387                         count++;
388                 if (list_empty(&neighbor->aff_list))
389                         count++;
390
391                 for (node = 0; node < MAX_NUMNODES; node++) {
392                         if ((cbe_spu_info[node].n_spus - atomic_read(
393                                 &cbe_spu_info[node].reserved_spus)) >= count)
394                                 break;
395                 }
396
397                 if (node == MAX_NUMNODES) {
398                         err = ERR_PTR(-EEXIST);
399                         goto out_put_neighbor;
400                 }
401         }
402
403         return neighbor;
404
405 out_put_neighbor:
406         put_spu_context(neighbor);
407         return err;
408 }
409
410 static void
411 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
412                                         struct spu_context *neighbor)
413 {
414         if (flags & SPU_CREATE_AFFINITY_MEM)
415                 ctx->gang->aff_ref_ctx = ctx;
416
417         if (flags & SPU_CREATE_AFFINITY_SPU) {
418                 if (list_empty(&neighbor->aff_list)) {
419                         list_add_tail(&neighbor->aff_list,
420                                 &ctx->gang->aff_list_head);
421                         neighbor->aff_head = 1;
422                 }
423
424                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
425                     || list_entry(neighbor->aff_list.next, struct spu_context,
426                                                         aff_list)->aff_head) {
427                         list_add(&ctx->aff_list, &neighbor->aff_list);
428                 } else  {
429                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
430                         if (neighbor->aff_head) {
431                                 neighbor->aff_head = 0;
432                                 ctx->aff_head = 1;
433                         }
434                 }
435
436                 if (!ctx->gang->aff_ref_ctx)
437                         ctx->gang->aff_ref_ctx = ctx;
438         }
439 }
440
441 static int
442 spufs_create_context(struct inode *inode, struct dentry *dentry,
443                         struct vfsmount *mnt, int flags, int mode,
444                         struct file *aff_filp)
445 {
446         int ret;
447         int affinity;
448         struct spu_gang *gang;
449         struct spu_context *neighbor;
450
451         ret = -EPERM;
452         if ((flags & SPU_CREATE_NOSCHED) &&
453             !capable(CAP_SYS_NICE))
454                 goto out_unlock;
455
456         ret = -EINVAL;
457         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
458             == SPU_CREATE_ISOLATE)
459                 goto out_unlock;
460
461         ret = -ENODEV;
462         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
463                 goto out_unlock;
464
465         gang = NULL;
466         neighbor = NULL;
467         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
468         if (affinity) {
469                 gang = SPUFS_I(inode)->i_gang;
470                 ret = -EINVAL;
471                 if (!gang)
472                         goto out_unlock;
473                 mutex_lock(&gang->aff_mutex);
474                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
475                 if (IS_ERR(neighbor)) {
476                         ret = PTR_ERR(neighbor);
477                         goto out_aff_unlock;
478                 }
479         }
480
481         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
482         if (ret)
483                 goto out_aff_unlock;
484
485         if (affinity) {
486                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
487                                                                 neighbor);
488                 if (neighbor)
489                         put_spu_context(neighbor);
490         }
491
492         /*
493          * get references for dget and mntget, will be released
494          * in error path of *_open().
495          */
496         ret = spufs_context_open(dget(dentry), mntget(mnt));
497         if (ret < 0) {
498                 WARN_ON(spufs_rmdir(inode, dentry));
499                 if (affinity)
500                         mutex_unlock(&gang->aff_mutex);
501                 mutex_unlock(&inode->i_mutex);
502                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
503                 goto out;
504         }
505
506 out_aff_unlock:
507         if (affinity)
508                 mutex_unlock(&gang->aff_mutex);
509 out_unlock:
510         mutex_unlock(&inode->i_mutex);
511 out:
512         dput(dentry);
513         return ret;
514 }
515
516 static int
517 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
518 {
519         int ret;
520         struct inode *inode;
521         struct spu_gang *gang;
522
523         ret = -ENOSPC;
524         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
525         if (!inode)
526                 goto out;
527
528         ret = 0;
529         if (dir->i_mode & S_ISGID) {
530                 inode->i_gid = dir->i_gid;
531                 inode->i_mode &= S_ISGID;
532         }
533         gang = alloc_spu_gang();
534         SPUFS_I(inode)->i_ctx = NULL;
535         SPUFS_I(inode)->i_gang = gang;
536         if (!gang)
537                 goto out_iput;
538
539         inode->i_op = &simple_dir_inode_operations;
540         inode->i_fop = &simple_dir_operations;
541
542         d_instantiate(dentry, inode);
543         inc_nlink(dir);
544         inc_nlink(dentry->d_inode);
545         return ret;
546
547 out_iput:
548         iput(inode);
549 out:
550         return ret;
551 }
552
553 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
554 {
555         int ret;
556         struct file *filp;
557
558         ret = get_unused_fd();
559         if (ret < 0) {
560                 dput(dentry);
561                 mntput(mnt);
562                 goto out;
563         }
564
565         filp = dentry_open(dentry, mnt, O_RDONLY);
566         if (IS_ERR(filp)) {
567                 put_unused_fd(ret);
568                 ret = PTR_ERR(filp);
569                 goto out;
570         }
571
572         filp->f_op = &simple_dir_operations;
573         fd_install(ret, filp);
574 out:
575         return ret;
576 }
577
578 static int spufs_create_gang(struct inode *inode,
579                         struct dentry *dentry,
580                         struct vfsmount *mnt, int mode)
581 {
582         int ret;
583
584         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
585         if (ret)
586                 goto out;
587
588         /*
589          * get references for dget and mntget, will be released
590          * in error path of *_open().
591          */
592         ret = spufs_gang_open(dget(dentry), mntget(mnt));
593         if (ret < 0) {
594                 int err = simple_rmdir(inode, dentry);
595                 WARN_ON(err);
596         }
597
598 out:
599         mutex_unlock(&inode->i_mutex);
600         dput(dentry);
601         return ret;
602 }
603
604
605 static struct file_system_type spufs_type;
606
607 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
608                                                         struct file *filp)
609 {
610         struct dentry *dentry;
611         int ret;
612
613         ret = -EINVAL;
614         /* check if we are on spufs */
615         if (nd->path.dentry->d_sb->s_type != &spufs_type)
616                 goto out;
617
618         /* don't accept undefined flags */
619         if (flags & (~SPU_CREATE_FLAG_ALL))
620                 goto out;
621
622         /* only threads can be underneath a gang */
623         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
624                 if ((flags & SPU_CREATE_GANG) ||
625                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
626                         goto out;
627         }
628
629         dentry = lookup_create(nd, 1);
630         ret = PTR_ERR(dentry);
631         if (IS_ERR(dentry))
632                 goto out_dir;
633
634         ret = -EEXIST;
635         if (dentry->d_inode)
636                 goto out_dput;
637
638         mode &= ~current->fs->umask;
639
640         if (flags & SPU_CREATE_GANG)
641                 ret = spufs_create_gang(nd->path.dentry->d_inode,
642                                          dentry, nd->path.mnt, mode);
643         else
644                 ret = spufs_create_context(nd->path.dentry->d_inode,
645                                             dentry, nd->path.mnt, flags, mode,
646                                             filp);
647         if (ret >= 0)
648                 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
649         return ret;
650
651 out_dput:
652         dput(dentry);
653 out_dir:
654         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
655 out:
656         return ret;
657 }
658
659 /* File system initialization */
660 enum {
661         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
662 };
663
664 static const match_table_t spufs_tokens = {
665         { Opt_uid,   "uid=%d" },
666         { Opt_gid,   "gid=%d" },
667         { Opt_mode,  "mode=%o" },
668         { Opt_debug, "debug" },
669         { Opt_err,    NULL  },
670 };
671
672 static int
673 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
674 {
675         char *p;
676         substring_t args[MAX_OPT_ARGS];
677
678         while ((p = strsep(&options, ",")) != NULL) {
679                 int token, option;
680
681                 if (!*p)
682                         continue;
683
684                 token = match_token(p, spufs_tokens, args);
685                 switch (token) {
686                 case Opt_uid:
687                         if (match_int(&args[0], &option))
688                                 return 0;
689                         root->i_uid = option;
690                         break;
691                 case Opt_gid:
692                         if (match_int(&args[0], &option))
693                                 return 0;
694                         root->i_gid = option;
695                         break;
696                 case Opt_mode:
697                         if (match_octal(&args[0], &option))
698                                 return 0;
699                         root->i_mode = option | S_IFDIR;
700                         break;
701                 case Opt_debug:
702                         spufs_get_sb_info(sb)->debug = 1;
703                         break;
704                 default:
705                         return 0;
706                 }
707         }
708         return 1;
709 }
710
711 static void spufs_exit_isolated_loader(void)
712 {
713         free_pages((unsigned long) isolated_loader,
714                         get_order(isolated_loader_size));
715 }
716
717 static void
718 spufs_init_isolated_loader(void)
719 {
720         struct device_node *dn;
721         const char *loader;
722         int size;
723
724         dn = of_find_node_by_path("/spu-isolation");
725         if (!dn)
726                 return;
727
728         loader = of_get_property(dn, "loader", &size);
729         if (!loader)
730                 return;
731
732         /* the loader must be align on a 16 byte boundary */
733         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
734         if (!isolated_loader)
735                 return;
736
737         isolated_loader_size = size;
738         memcpy(isolated_loader, loader, size);
739         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
740 }
741
742 static int
743 spufs_create_root(struct super_block *sb, void *data)
744 {
745         struct inode *inode;
746         int ret;
747
748         ret = -ENODEV;
749         if (!spu_management_ops)
750                 goto out;
751
752         ret = -ENOMEM;
753         inode = spufs_new_inode(sb, S_IFDIR | 0775);
754         if (!inode)
755                 goto out;
756
757         inode->i_op = &simple_dir_inode_operations;
758         inode->i_fop = &simple_dir_operations;
759         SPUFS_I(inode)->i_ctx = NULL;
760         inc_nlink(inode);
761
762         ret = -EINVAL;
763         if (!spufs_parse_options(sb, data, inode))
764                 goto out_iput;
765
766         ret = -ENOMEM;
767         sb->s_root = d_alloc_root(inode);
768         if (!sb->s_root)
769                 goto out_iput;
770
771         return 0;
772 out_iput:
773         iput(inode);
774 out:
775         return ret;
776 }
777
778 static int
779 spufs_fill_super(struct super_block *sb, void *data, int silent)
780 {
781         struct spufs_sb_info *info;
782         static struct super_operations s_ops = {
783                 .alloc_inode = spufs_alloc_inode,
784                 .destroy_inode = spufs_destroy_inode,
785                 .statfs = simple_statfs,
786                 .delete_inode = spufs_delete_inode,
787                 .drop_inode = generic_delete_inode,
788                 .show_options = generic_show_options,
789         };
790
791         save_mount_options(sb, data);
792
793         info = kzalloc(sizeof(*info), GFP_KERNEL);
794         if (!info)
795                 return -ENOMEM;
796
797         sb->s_maxbytes = MAX_LFS_FILESIZE;
798         sb->s_blocksize = PAGE_CACHE_SIZE;
799         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
800         sb->s_magic = SPUFS_MAGIC;
801         sb->s_op = &s_ops;
802         sb->s_fs_info = info;
803
804         return spufs_create_root(sb, data);
805 }
806
807 static int
808 spufs_get_sb(struct file_system_type *fstype, int flags,
809                 const char *name, void *data, struct vfsmount *mnt)
810 {
811         return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
812 }
813
814 static struct file_system_type spufs_type = {
815         .owner = THIS_MODULE,
816         .name = "spufs",
817         .get_sb = spufs_get_sb,
818         .kill_sb = kill_litter_super,
819 };
820
821 static int __init spufs_init(void)
822 {
823         int ret;
824
825         ret = -ENODEV;
826         if (!spu_management_ops)
827                 goto out;
828
829         ret = -ENOMEM;
830         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
831                         sizeof(struct spufs_inode_info), 0,
832                         SLAB_HWCACHE_ALIGN, spufs_init_once);
833
834         if (!spufs_inode_cache)
835                 goto out;
836         ret = spu_sched_init();
837         if (ret)
838                 goto out_cache;
839         ret = register_filesystem(&spufs_type);
840         if (ret)
841                 goto out_sched;
842         ret = register_spu_syscalls(&spufs_calls);
843         if (ret)
844                 goto out_fs;
845
846         spufs_init_isolated_loader();
847
848         return 0;
849
850 out_fs:
851         unregister_filesystem(&spufs_type);
852 out_sched:
853         spu_sched_exit();
854 out_cache:
855         kmem_cache_destroy(spufs_inode_cache);
856 out:
857         return ret;
858 }
859 module_init(spufs_init);
860
861 static void __exit spufs_exit(void)
862 {
863         spu_sched_exit();
864         spufs_exit_isolated_loader();
865         unregister_spu_syscalls(&spufs_calls);
866         unregister_filesystem(&spufs_type);
867         kmem_cache_destroy(spufs_inode_cache);
868 }
869 module_exit(spufs_exit);
870
871 MODULE_LICENSE("GPL");
872 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
873