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