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