2662b50ea8d450fa7e4c74649c50e2b231989f17
[linux-2.6.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
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         setattr_copy(inode, attr);
114         mark_inode_dirty(inode);
115         return 0;
116 }
117
118
119 static int
120 spufs_new_file(struct super_block *sb, struct dentry *dentry,
121                 const struct file_operations *fops, int mode,
122                 size_t size, struct spu_context *ctx)
123 {
124         static const struct inode_operations spufs_file_iops = {
125                 .setattr = spufs_setattr,
126         };
127         struct inode *inode;
128         int ret;
129
130         ret = -ENOSPC;
131         inode = spufs_new_inode(sb, S_IFREG | mode);
132         if (!inode)
133                 goto out;
134
135         ret = 0;
136         inode->i_op = &spufs_file_iops;
137         inode->i_fop = fops;
138         inode->i_size = size;
139         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
140         d_add(dentry, inode);
141 out:
142         return ret;
143 }
144
145 static void
146 spufs_evict_inode(struct inode *inode)
147 {
148         struct spufs_inode_info *ei = SPUFS_I(inode);
149         end_writeback(inode);
150         if (ei->i_ctx)
151                 put_spu_context(ei->i_ctx);
152         if (ei->i_gang)
153                 put_spu_gang(ei->i_gang);
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(&dentry->d_lock);
163                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
164                         dget_locked_dlock(dentry);
165                         __d_drop(dentry);
166                         spin_unlock(&dentry->d_lock);
167                         simple_unlink(dir->d_inode, dentry);
168                         /* XXX: what was dcache_lock protecting here? Other
169                          * filesystems (IB, configfs) release dcache_lock
170                          * before unlink */
171                         dput(dentry);
172                 } else {
173                         spin_unlock(&dentry->d_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,
191                 const struct spufs_tree_descr *files, int mode,
192                 struct spu_context *ctx)
193 {
194         struct dentry *dentry, *tmp;
195         int ret;
196
197         while (files->name && files->name[0]) {
198                 ret = -ENOMEM;
199                 dentry = d_alloc_name(dir, files->name);
200                 if (!dentry)
201                         goto out;
202                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
203                                         files->mode & mode, files->size, ctx);
204                 if (ret)
205                         goto out;
206                 files++;
207         }
208         return 0;
209 out:
210         /*
211          * remove all children from dir. dir->inode is not set so don't
212          * just simply use spufs_prune_dir() and panic afterwards :)
213          * dput() looks like it will do the right thing:
214          * - dec parent's ref counter
215          * - remove child from parent's child list
216          * - free child's inode if possible
217          * - free child
218          */
219         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
220                 dput(dentry);
221         }
222
223         shrink_dcache_parent(dir);
224         return ret;
225 }
226
227 static int spufs_dir_close(struct inode *inode, struct file *file)
228 {
229         struct spu_context *ctx;
230         struct inode *parent;
231         struct dentry *dir;
232         int ret;
233
234         dir = file->f_path.dentry;
235         parent = dir->d_parent->d_inode;
236         ctx = SPUFS_I(dir->d_inode)->i_ctx;
237
238         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
239         ret = spufs_rmdir(parent, dir);
240         mutex_unlock(&parent->i_mutex);
241         WARN_ON(ret);
242
243         /* We have to give up the mm_struct */
244         spu_forget(ctx);
245
246         return dcache_dir_close(inode, file);
247 }
248
249 const struct file_operations spufs_context_fops = {
250         .open           = dcache_dir_open,
251         .release        = spufs_dir_close,
252         .llseek         = dcache_dir_lseek,
253         .read           = generic_read_dir,
254         .readdir        = dcache_readdir,
255         .fsync          = noop_fsync,
256 };
257 EXPORT_SYMBOL_GPL(spufs_context_fops);
258
259 static int
260 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
261                 int mode)
262 {
263         int ret;
264         struct inode *inode;
265         struct spu_context *ctx;
266
267         ret = -ENOSPC;
268         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
269         if (!inode)
270                 goto out;
271
272         if (dir->i_mode & S_ISGID) {
273                 inode->i_gid = dir->i_gid;
274                 inode->i_mode &= S_ISGID;
275         }
276         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
277         SPUFS_I(inode)->i_ctx = ctx;
278         if (!ctx)
279                 goto out_iput;
280
281         ctx->flags = flags;
282         inode->i_op = &simple_dir_inode_operations;
283         inode->i_fop = &simple_dir_operations;
284         if (flags & SPU_CREATE_NOSCHED)
285                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
286                                          mode, ctx);
287         else
288                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
289
290         if (ret)
291                 goto out_free_ctx;
292
293         if (spufs_get_sb_info(dir->i_sb)->debug)
294                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
295                                 mode, ctx);
296
297         if (ret)
298                 goto out_free_ctx;
299
300         d_instantiate(dentry, inode);
301         dget(dentry);
302         inc_nlink(dir);
303         inc_nlink(dentry->d_inode);
304         goto out;
305
306 out_free_ctx:
307         spu_forget(ctx);
308         put_spu_context(ctx);
309 out_iput:
310         iput(inode);
311 out:
312         return ret;
313 }
314
315 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
316 {
317         int ret;
318         struct file *filp;
319
320         ret = get_unused_fd();
321         if (ret < 0) {
322                 dput(dentry);
323                 mntput(mnt);
324                 goto out;
325         }
326
327         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
328         if (IS_ERR(filp)) {
329                 put_unused_fd(ret);
330                 ret = PTR_ERR(filp);
331                 goto out;
332         }
333
334         filp->f_op = &spufs_context_fops;
335         fd_install(ret, filp);
336 out:
337         return ret;
338 }
339
340 static struct spu_context *
341 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
342                                                 struct file *filp)
343 {
344         struct spu_context *tmp, *neighbor, *err;
345         int count, node;
346         int aff_supp;
347
348         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
349                                         struct spu, cbe_list))->aff_list);
350
351         if (!aff_supp)
352                 return ERR_PTR(-EINVAL);
353
354         if (flags & SPU_CREATE_GANG)
355                 return ERR_PTR(-EINVAL);
356
357         if (flags & SPU_CREATE_AFFINITY_MEM &&
358             gang->aff_ref_ctx &&
359             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
360                 return ERR_PTR(-EEXIST);
361
362         if (gang->aff_flags & AFF_MERGED)
363                 return ERR_PTR(-EBUSY);
364
365         neighbor = NULL;
366         if (flags & SPU_CREATE_AFFINITY_SPU) {
367                 if (!filp || filp->f_op != &spufs_context_fops)
368                         return ERR_PTR(-EINVAL);
369
370                 neighbor = get_spu_context(
371                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
372
373                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
374                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
375                     !list_entry(neighbor->aff_list.next, struct spu_context,
376                     aff_list)->aff_head) {
377                         err = ERR_PTR(-EEXIST);
378                         goto out_put_neighbor;
379                 }
380
381                 if (gang != neighbor->gang) {
382                         err = ERR_PTR(-EINVAL);
383                         goto out_put_neighbor;
384                 }
385
386                 count = 1;
387                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
388                         count++;
389                 if (list_empty(&neighbor->aff_list))
390                         count++;
391
392                 for (node = 0; node < MAX_NUMNODES; node++) {
393                         if ((cbe_spu_info[node].n_spus - atomic_read(
394                                 &cbe_spu_info[node].reserved_spus)) >= count)
395                                 break;
396                 }
397
398                 if (node == MAX_NUMNODES) {
399                         err = ERR_PTR(-EEXIST);
400                         goto out_put_neighbor;
401                 }
402         }
403
404         return neighbor;
405
406 out_put_neighbor:
407         put_spu_context(neighbor);
408         return err;
409 }
410
411 static void
412 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
413                                         struct spu_context *neighbor)
414 {
415         if (flags & SPU_CREATE_AFFINITY_MEM)
416                 ctx->gang->aff_ref_ctx = ctx;
417
418         if (flags & SPU_CREATE_AFFINITY_SPU) {
419                 if (list_empty(&neighbor->aff_list)) {
420                         list_add_tail(&neighbor->aff_list,
421                                 &ctx->gang->aff_list_head);
422                         neighbor->aff_head = 1;
423                 }
424
425                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
426                     || list_entry(neighbor->aff_list.next, struct spu_context,
427                                                         aff_list)->aff_head) {
428                         list_add(&ctx->aff_list, &neighbor->aff_list);
429                 } else  {
430                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
431                         if (neighbor->aff_head) {
432                                 neighbor->aff_head = 0;
433                                 ctx->aff_head = 1;
434                         }
435                 }
436
437                 if (!ctx->gang->aff_ref_ctx)
438                         ctx->gang->aff_ref_ctx = ctx;
439         }
440 }
441
442 static int
443 spufs_create_context(struct inode *inode, struct dentry *dentry,
444                         struct vfsmount *mnt, int flags, int mode,
445                         struct file *aff_filp)
446 {
447         int ret;
448         int affinity;
449         struct spu_gang *gang;
450         struct spu_context *neighbor;
451
452         ret = -EPERM;
453         if ((flags & SPU_CREATE_NOSCHED) &&
454             !capable(CAP_SYS_NICE))
455                 goto out_unlock;
456
457         ret = -EINVAL;
458         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
459             == SPU_CREATE_ISOLATE)
460                 goto out_unlock;
461
462         ret = -ENODEV;
463         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
464                 goto out_unlock;
465
466         gang = NULL;
467         neighbor = NULL;
468         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
469         if (affinity) {
470                 gang = SPUFS_I(inode)->i_gang;
471                 ret = -EINVAL;
472                 if (!gang)
473                         goto out_unlock;
474                 mutex_lock(&gang->aff_mutex);
475                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
476                 if (IS_ERR(neighbor)) {
477                         ret = PTR_ERR(neighbor);
478                         goto out_aff_unlock;
479                 }
480         }
481
482         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
483         if (ret)
484                 goto out_aff_unlock;
485
486         if (affinity) {
487                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
488                                                                 neighbor);
489                 if (neighbor)
490                         put_spu_context(neighbor);
491         }
492
493         /*
494          * get references for dget and mntget, will be released
495          * in error path of *_open().
496          */
497         ret = spufs_context_open(dget(dentry), mntget(mnt));
498         if (ret < 0) {
499                 WARN_ON(spufs_rmdir(inode, dentry));
500                 if (affinity)
501                         mutex_unlock(&gang->aff_mutex);
502                 mutex_unlock(&inode->i_mutex);
503                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
504                 goto out;
505         }
506
507 out_aff_unlock:
508         if (affinity)
509                 mutex_unlock(&gang->aff_mutex);
510 out_unlock:
511         mutex_unlock(&inode->i_mutex);
512 out:
513         dput(dentry);
514         return ret;
515 }
516
517 static int
518 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
519 {
520         int ret;
521         struct inode *inode;
522         struct spu_gang *gang;
523
524         ret = -ENOSPC;
525         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
526         if (!inode)
527                 goto out;
528
529         ret = 0;
530         if (dir->i_mode & S_ISGID) {
531                 inode->i_gid = dir->i_gid;
532                 inode->i_mode &= S_ISGID;
533         }
534         gang = alloc_spu_gang();
535         SPUFS_I(inode)->i_ctx = NULL;
536         SPUFS_I(inode)->i_gang = gang;
537         if (!gang)
538                 goto out_iput;
539
540         inode->i_op = &simple_dir_inode_operations;
541         inode->i_fop = &simple_dir_operations;
542
543         d_instantiate(dentry, inode);
544         inc_nlink(dir);
545         inc_nlink(dentry->d_inode);
546         return ret;
547
548 out_iput:
549         iput(inode);
550 out:
551         return ret;
552 }
553
554 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
555 {
556         int ret;
557         struct file *filp;
558
559         ret = get_unused_fd();
560         if (ret < 0) {
561                 dput(dentry);
562                 mntput(mnt);
563                 goto out;
564         }
565
566         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
567         if (IS_ERR(filp)) {
568                 put_unused_fd(ret);
569                 ret = PTR_ERR(filp);
570                 goto out;
571         }
572
573         filp->f_op = &simple_dir_operations;
574         fd_install(ret, filp);
575 out:
576         return ret;
577 }
578
579 static int spufs_create_gang(struct inode *inode,
580                         struct dentry *dentry,
581                         struct vfsmount *mnt, int mode)
582 {
583         int ret;
584
585         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
586         if (ret)
587                 goto out;
588
589         /*
590          * get references for dget and mntget, will be released
591          * in error path of *_open().
592          */
593         ret = spufs_gang_open(dget(dentry), mntget(mnt));
594         if (ret < 0) {
595                 int err = simple_rmdir(inode, dentry);
596                 WARN_ON(err);
597         }
598
599 out:
600         mutex_unlock(&inode->i_mutex);
601         dput(dentry);
602         return ret;
603 }
604
605
606 static struct file_system_type spufs_type;
607
608 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
609                                                         struct file *filp)
610 {
611         struct dentry *dentry;
612         int ret;
613
614         ret = -EINVAL;
615         /* check if we are on spufs */
616         if (nd->path.dentry->d_sb->s_type != &spufs_type)
617                 goto out;
618
619         /* don't accept undefined flags */
620         if (flags & (~SPU_CREATE_FLAG_ALL))
621                 goto out;
622
623         /* only threads can be underneath a gang */
624         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
625                 if ((flags & SPU_CREATE_GANG) ||
626                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
627                         goto out;
628         }
629
630         dentry = lookup_create(nd, 1);
631         ret = PTR_ERR(dentry);
632         if (IS_ERR(dentry))
633                 goto out_dir;
634
635         mode &= ~current_umask();
636
637         if (flags & SPU_CREATE_GANG)
638                 ret = spufs_create_gang(nd->path.dentry->d_inode,
639                                          dentry, nd->path.mnt, mode);
640         else
641                 ret = spufs_create_context(nd->path.dentry->d_inode,
642                                             dentry, nd->path.mnt, flags, mode,
643                                             filp);
644         if (ret >= 0)
645                 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
646         return ret;
647
648 out_dir:
649         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
650 out:
651         return ret;
652 }
653
654 /* File system initialization */
655 enum {
656         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
657 };
658
659 static const match_table_t spufs_tokens = {
660         { Opt_uid,   "uid=%d" },
661         { Opt_gid,   "gid=%d" },
662         { Opt_mode,  "mode=%o" },
663         { Opt_debug, "debug" },
664         { Opt_err,    NULL  },
665 };
666
667 static int
668 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
669 {
670         char *p;
671         substring_t args[MAX_OPT_ARGS];
672
673         while ((p = strsep(&options, ",")) != NULL) {
674                 int token, option;
675
676                 if (!*p)
677                         continue;
678
679                 token = match_token(p, spufs_tokens, args);
680                 switch (token) {
681                 case Opt_uid:
682                         if (match_int(&args[0], &option))
683                                 return 0;
684                         root->i_uid = option;
685                         break;
686                 case Opt_gid:
687                         if (match_int(&args[0], &option))
688                                 return 0;
689                         root->i_gid = option;
690                         break;
691                 case Opt_mode:
692                         if (match_octal(&args[0], &option))
693                                 return 0;
694                         root->i_mode = option | S_IFDIR;
695                         break;
696                 case Opt_debug:
697                         spufs_get_sb_info(sb)->debug = 1;
698                         break;
699                 default:
700                         return 0;
701                 }
702         }
703         return 1;
704 }
705
706 static void spufs_exit_isolated_loader(void)
707 {
708         free_pages((unsigned long) isolated_loader,
709                         get_order(isolated_loader_size));
710 }
711
712 static void
713 spufs_init_isolated_loader(void)
714 {
715         struct device_node *dn;
716         const char *loader;
717         int size;
718
719         dn = of_find_node_by_path("/spu-isolation");
720         if (!dn)
721                 return;
722
723         loader = of_get_property(dn, "loader", &size);
724         if (!loader)
725                 return;
726
727         /* the loader must be align on a 16 byte boundary */
728         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
729         if (!isolated_loader)
730                 return;
731
732         isolated_loader_size = size;
733         memcpy(isolated_loader, loader, size);
734         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
735 }
736
737 static int
738 spufs_create_root(struct super_block *sb, void *data)
739 {
740         struct inode *inode;
741         int ret;
742
743         ret = -ENODEV;
744         if (!spu_management_ops)
745                 goto out;
746
747         ret = -ENOMEM;
748         inode = spufs_new_inode(sb, S_IFDIR | 0775);
749         if (!inode)
750                 goto out;
751
752         inode->i_op = &simple_dir_inode_operations;
753         inode->i_fop = &simple_dir_operations;
754         SPUFS_I(inode)->i_ctx = NULL;
755         inc_nlink(inode);
756
757         ret = -EINVAL;
758         if (!spufs_parse_options(sb, data, inode))
759                 goto out_iput;
760
761         ret = -ENOMEM;
762         sb->s_root = d_alloc_root(inode);
763         if (!sb->s_root)
764                 goto out_iput;
765
766         return 0;
767 out_iput:
768         iput(inode);
769 out:
770         return ret;
771 }
772
773 static int
774 spufs_fill_super(struct super_block *sb, void *data, int silent)
775 {
776         struct spufs_sb_info *info;
777         static const struct super_operations s_ops = {
778                 .alloc_inode = spufs_alloc_inode,
779                 .destroy_inode = spufs_destroy_inode,
780                 .statfs = simple_statfs,
781                 .evict_inode = spufs_evict_inode,
782                 .show_options = generic_show_options,
783         };
784
785         save_mount_options(sb, data);
786
787         info = kzalloc(sizeof(*info), GFP_KERNEL);
788         if (!info)
789                 return -ENOMEM;
790
791         sb->s_maxbytes = MAX_LFS_FILESIZE;
792         sb->s_blocksize = PAGE_CACHE_SIZE;
793         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
794         sb->s_magic = SPUFS_MAGIC;
795         sb->s_op = &s_ops;
796         sb->s_fs_info = info;
797
798         return spufs_create_root(sb, data);
799 }
800
801 static struct dentry *
802 spufs_mount(struct file_system_type *fstype, int flags,
803                 const char *name, void *data)
804 {
805         return mount_single(fstype, flags, data, spufs_fill_super);
806 }
807
808 static struct file_system_type spufs_type = {
809         .owner = THIS_MODULE,
810         .name = "spufs",
811         .mount = spufs_mount,
812         .kill_sb = kill_litter_super,
813 };
814
815 static int __init spufs_init(void)
816 {
817         int ret;
818
819         ret = -ENODEV;
820         if (!spu_management_ops)
821                 goto out;
822
823         ret = -ENOMEM;
824         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
825                         sizeof(struct spufs_inode_info), 0,
826                         SLAB_HWCACHE_ALIGN, spufs_init_once);
827
828         if (!spufs_inode_cache)
829                 goto out;
830         ret = spu_sched_init();
831         if (ret)
832                 goto out_cache;
833         ret = register_filesystem(&spufs_type);
834         if (ret)
835                 goto out_sched;
836         ret = register_spu_syscalls(&spufs_calls);
837         if (ret)
838                 goto out_fs;
839
840         spufs_init_isolated_loader();
841
842         return 0;
843
844 out_fs:
845         unregister_filesystem(&spufs_type);
846 out_sched:
847         spu_sched_exit();
848 out_cache:
849         kmem_cache_destroy(spufs_inode_cache);
850 out:
851         return ret;
852 }
853 module_init(spufs_init);
854
855 static void __exit spufs_exit(void)
856 {
857         spu_sched_exit();
858         spufs_exit_isolated_loader();
859         unregister_spu_syscalls(&spufs_calls);
860         unregister_filesystem(&spufs_type);
861         kmem_cache_destroy(spufs_inode_cache);
862 }
863 module_exit(spufs_exit);
864
865 MODULE_LICENSE("GPL");
866 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
867