db329d4bf1c30610836bedf072c49cc40edf0d00
[muen/linux.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 <linux/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         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
78 }
79
80 static void spufs_destroy_inode(struct inode *inode)
81 {
82         call_rcu(&inode->i_rcu, spufs_i_callback);
83 }
84
85 static void
86 spufs_init_once(void *p)
87 {
88         struct spufs_inode_info *ei = p;
89
90         inode_init_once(&ei->vfs_inode);
91 }
92
93 static struct inode *
94 spufs_new_inode(struct super_block *sb, umode_t mode)
95 {
96         struct inode *inode;
97
98         inode = new_inode(sb);
99         if (!inode)
100                 goto out;
101
102         inode->i_ino = get_next_ino();
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(inode);
107 out:
108         return inode;
109 }
110
111 static int
112 spufs_setattr(struct dentry *dentry, struct iattr *attr)
113 {
114         struct inode *inode = d_inode(dentry);
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, umode_t 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         clear_inode(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         inode_lock(d_inode(dir));
167         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
168                 spin_lock(&dentry->d_lock);
169                 if (simple_positive(dentry)) {
170                         dget_dlock(dentry);
171                         __d_drop(dentry);
172                         spin_unlock(&dentry->d_lock);
173                         simple_unlink(d_inode(dir), 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         inode_unlock(d_inode(dir));
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         int res;
191         spufs_prune_dir(dir);
192         d_drop(dir);
193         res = simple_rmdir(parent, dir);
194         /* We have to give up the mm_struct */
195         spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
196         return res;
197 }
198
199 static int spufs_fill_dir(struct dentry *dir,
200                 const struct spufs_tree_descr *files, umode_t mode,
201                 struct spu_context *ctx)
202 {
203         while (files->name && files->name[0]) {
204                 int ret;
205                 struct dentry *dentry = d_alloc_name(dir, files->name);
206                 if (!dentry)
207                         return -ENOMEM;
208                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
209                                         files->mode & mode, files->size, ctx);
210                 if (ret)
211                         return ret;
212                 files++;
213         }
214         return 0;
215 }
216
217 static int spufs_dir_close(struct inode *inode, struct file *file)
218 {
219         struct spu_context *ctx;
220         struct inode *parent;
221         struct dentry *dir;
222         int ret;
223
224         dir = file->f_path.dentry;
225         parent = d_inode(dir->d_parent);
226         ctx = SPUFS_I(d_inode(dir))->i_ctx;
227
228         inode_lock_nested(parent, I_MUTEX_PARENT);
229         ret = spufs_rmdir(parent, dir);
230         inode_unlock(parent);
231         WARN_ON(ret);
232
233         return dcache_dir_close(inode, file);
234 }
235
236 const struct file_operations spufs_context_fops = {
237         .open           = dcache_dir_open,
238         .release        = spufs_dir_close,
239         .llseek         = dcache_dir_lseek,
240         .read           = generic_read_dir,
241         .iterate_shared = dcache_readdir,
242         .fsync          = noop_fsync,
243 };
244 EXPORT_SYMBOL_GPL(spufs_context_fops);
245
246 static int
247 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
248                 umode_t mode)
249 {
250         int ret;
251         struct inode *inode;
252         struct spu_context *ctx;
253
254         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
255         if (!inode)
256                 return -ENOSPC;
257
258         if (dir->i_mode & S_ISGID) {
259                 inode->i_gid = dir->i_gid;
260                 inode->i_mode &= S_ISGID;
261         }
262         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
263         SPUFS_I(inode)->i_ctx = ctx;
264         if (!ctx) {
265                 iput(inode);
266                 return -ENOSPC;
267         }
268
269         ctx->flags = flags;
270         inode->i_op = &simple_dir_inode_operations;
271         inode->i_fop = &simple_dir_operations;
272
273         inode_lock(inode);
274
275         dget(dentry);
276         inc_nlink(dir);
277         inc_nlink(inode);
278
279         d_instantiate(dentry, inode);
280
281         if (flags & SPU_CREATE_NOSCHED)
282                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
283                                          mode, ctx);
284         else
285                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
286
287         if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
288                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
289                                 mode, ctx);
290
291         if (ret)
292                 spufs_rmdir(dir, dentry);
293
294         inode_unlock(inode);
295
296         return ret;
297 }
298
299 static int spufs_context_open(struct path *path)
300 {
301         int ret;
302         struct file *filp;
303
304         ret = get_unused_fd_flags(0);
305         if (ret < 0)
306                 return ret;
307
308         filp = dentry_open(path, O_RDONLY, current_cred());
309         if (IS_ERR(filp)) {
310                 put_unused_fd(ret);
311                 return PTR_ERR(filp);
312         }
313
314         filp->f_op = &spufs_context_fops;
315         fd_install(ret, filp);
316         return ret;
317 }
318
319 static struct spu_context *
320 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
321                                                 struct file *filp)
322 {
323         struct spu_context *tmp, *neighbor, *err;
324         int count, node;
325         int aff_supp;
326
327         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
328                                         struct spu, cbe_list))->aff_list);
329
330         if (!aff_supp)
331                 return ERR_PTR(-EINVAL);
332
333         if (flags & SPU_CREATE_GANG)
334                 return ERR_PTR(-EINVAL);
335
336         if (flags & SPU_CREATE_AFFINITY_MEM &&
337             gang->aff_ref_ctx &&
338             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
339                 return ERR_PTR(-EEXIST);
340
341         if (gang->aff_flags & AFF_MERGED)
342                 return ERR_PTR(-EBUSY);
343
344         neighbor = NULL;
345         if (flags & SPU_CREATE_AFFINITY_SPU) {
346                 if (!filp || filp->f_op != &spufs_context_fops)
347                         return ERR_PTR(-EINVAL);
348
349                 neighbor = get_spu_context(
350                                 SPUFS_I(file_inode(filp))->i_ctx);
351
352                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
353                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
354                     !list_entry(neighbor->aff_list.next, struct spu_context,
355                     aff_list)->aff_head) {
356                         err = ERR_PTR(-EEXIST);
357                         goto out_put_neighbor;
358                 }
359
360                 if (gang != neighbor->gang) {
361                         err = ERR_PTR(-EINVAL);
362                         goto out_put_neighbor;
363                 }
364
365                 count = 1;
366                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
367                         count++;
368                 if (list_empty(&neighbor->aff_list))
369                         count++;
370
371                 for (node = 0; node < MAX_NUMNODES; node++) {
372                         if ((cbe_spu_info[node].n_spus - atomic_read(
373                                 &cbe_spu_info[node].reserved_spus)) >= count)
374                                 break;
375                 }
376
377                 if (node == MAX_NUMNODES) {
378                         err = ERR_PTR(-EEXIST);
379                         goto out_put_neighbor;
380                 }
381         }
382
383         return neighbor;
384
385 out_put_neighbor:
386         put_spu_context(neighbor);
387         return err;
388 }
389
390 static void
391 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
392                                         struct spu_context *neighbor)
393 {
394         if (flags & SPU_CREATE_AFFINITY_MEM)
395                 ctx->gang->aff_ref_ctx = ctx;
396
397         if (flags & SPU_CREATE_AFFINITY_SPU) {
398                 if (list_empty(&neighbor->aff_list)) {
399                         list_add_tail(&neighbor->aff_list,
400                                 &ctx->gang->aff_list_head);
401                         neighbor->aff_head = 1;
402                 }
403
404                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
405                     || list_entry(neighbor->aff_list.next, struct spu_context,
406                                                         aff_list)->aff_head) {
407                         list_add(&ctx->aff_list, &neighbor->aff_list);
408                 } else  {
409                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
410                         if (neighbor->aff_head) {
411                                 neighbor->aff_head = 0;
412                                 ctx->aff_head = 1;
413                         }
414                 }
415
416                 if (!ctx->gang->aff_ref_ctx)
417                         ctx->gang->aff_ref_ctx = ctx;
418         }
419 }
420
421 static int
422 spufs_create_context(struct inode *inode, struct dentry *dentry,
423                         struct vfsmount *mnt, int flags, umode_t mode,
424                         struct file *aff_filp)
425 {
426         int ret;
427         int affinity;
428         struct spu_gang *gang;
429         struct spu_context *neighbor;
430         struct path path = {.mnt = mnt, .dentry = dentry};
431
432         if ((flags & SPU_CREATE_NOSCHED) &&
433             !capable(CAP_SYS_NICE))
434                 return -EPERM;
435
436         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
437             == SPU_CREATE_ISOLATE)
438                 return -EINVAL;
439
440         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
441                 return -ENODEV;
442
443         gang = NULL;
444         neighbor = NULL;
445         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
446         if (affinity) {
447                 gang = SPUFS_I(inode)->i_gang;
448                 if (!gang)
449                         return -EINVAL;
450                 mutex_lock(&gang->aff_mutex);
451                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
452                 if (IS_ERR(neighbor)) {
453                         ret = PTR_ERR(neighbor);
454                         goto out_aff_unlock;
455                 }
456         }
457
458         ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
459         if (ret)
460                 goto out_aff_unlock;
461
462         if (affinity) {
463                 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
464                                                                 neighbor);
465                 if (neighbor)
466                         put_spu_context(neighbor);
467         }
468
469         ret = spufs_context_open(&path);
470         if (ret < 0)
471                 WARN_ON(spufs_rmdir(inode, dentry));
472
473 out_aff_unlock:
474         if (affinity)
475                 mutex_unlock(&gang->aff_mutex);
476         return ret;
477 }
478
479 static int
480 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
481 {
482         int ret;
483         struct inode *inode;
484         struct spu_gang *gang;
485
486         ret = -ENOSPC;
487         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
488         if (!inode)
489                 goto out;
490
491         ret = 0;
492         if (dir->i_mode & S_ISGID) {
493                 inode->i_gid = dir->i_gid;
494                 inode->i_mode &= S_ISGID;
495         }
496         gang = alloc_spu_gang();
497         SPUFS_I(inode)->i_ctx = NULL;
498         SPUFS_I(inode)->i_gang = gang;
499         if (!gang) {
500                 ret = -ENOMEM;
501                 goto out_iput;
502         }
503
504         inode->i_op = &simple_dir_inode_operations;
505         inode->i_fop = &simple_dir_operations;
506
507         d_instantiate(dentry, inode);
508         inc_nlink(dir);
509         inc_nlink(d_inode(dentry));
510         return ret;
511
512 out_iput:
513         iput(inode);
514 out:
515         return ret;
516 }
517
518 static int spufs_gang_open(struct path *path)
519 {
520         int ret;
521         struct file *filp;
522
523         ret = get_unused_fd_flags(0);
524         if (ret < 0)
525                 return ret;
526
527         /*
528          * get references for dget and mntget, will be released
529          * in error path of *_open().
530          */
531         filp = dentry_open(path, O_RDONLY, current_cred());
532         if (IS_ERR(filp)) {
533                 put_unused_fd(ret);
534                 return PTR_ERR(filp);
535         }
536
537         filp->f_op = &simple_dir_operations;
538         fd_install(ret, filp);
539         return ret;
540 }
541
542 static int spufs_create_gang(struct inode *inode,
543                         struct dentry *dentry,
544                         struct vfsmount *mnt, umode_t mode)
545 {
546         struct path path = {.mnt = mnt, .dentry = dentry};
547         int ret;
548
549         ret = spufs_mkgang(inode, dentry, mode & 0777);
550         if (!ret) {
551                 ret = spufs_gang_open(&path);
552                 if (ret < 0) {
553                         int err = simple_rmdir(inode, dentry);
554                         WARN_ON(err);
555                 }
556         }
557         return ret;
558 }
559
560
561 static struct file_system_type spufs_type;
562
563 long spufs_create(struct path *path, struct dentry *dentry,
564                 unsigned int flags, umode_t mode, struct file *filp)
565 {
566         struct inode *dir = d_inode(path->dentry);
567         int ret;
568
569         /* check if we are on spufs */
570         if (path->dentry->d_sb->s_type != &spufs_type)
571                 return -EINVAL;
572
573         /* don't accept undefined flags */
574         if (flags & (~SPU_CREATE_FLAG_ALL))
575                 return -EINVAL;
576
577         /* only threads can be underneath a gang */
578         if (path->dentry != path->dentry->d_sb->s_root)
579                 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
580                         return -EINVAL;
581
582         mode &= ~current_umask();
583
584         if (flags & SPU_CREATE_GANG)
585                 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
586         else
587                 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
588                                             filp);
589         if (ret >= 0)
590                 fsnotify_mkdir(dir, dentry);
591
592         return ret;
593 }
594
595 /* File system initialization */
596 enum {
597         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
598 };
599
600 static const match_table_t spufs_tokens = {
601         { Opt_uid,   "uid=%d" },
602         { Opt_gid,   "gid=%d" },
603         { Opt_mode,  "mode=%o" },
604         { Opt_debug, "debug" },
605         { Opt_err,    NULL  },
606 };
607
608 static int spufs_show_options(struct seq_file *m, struct dentry *root)
609 {
610         struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
611         struct inode *inode = root->d_inode;
612
613         if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
614                 seq_printf(m, ",uid=%u",
615                            from_kuid_munged(&init_user_ns, inode->i_uid));
616         if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
617                 seq_printf(m, ",gid=%u",
618                            from_kgid_munged(&init_user_ns, inode->i_gid));
619         if ((inode->i_mode & S_IALLUGO) != 0775)
620                 seq_printf(m, ",mode=%o", inode->i_mode);
621         if (sbi->debug)
622                 seq_puts(m, ",debug");
623         return 0;
624 }
625
626 static int
627 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
628 {
629         char *p;
630         substring_t args[MAX_OPT_ARGS];
631
632         while ((p = strsep(&options, ",")) != NULL) {
633                 int token, option;
634
635                 if (!*p)
636                         continue;
637
638                 token = match_token(p, spufs_tokens, args);
639                 switch (token) {
640                 case Opt_uid:
641                         if (match_int(&args[0], &option))
642                                 return 0;
643                         root->i_uid = make_kuid(current_user_ns(), option);
644                         if (!uid_valid(root->i_uid))
645                                 return 0;
646                         break;
647                 case Opt_gid:
648                         if (match_int(&args[0], &option))
649                                 return 0;
650                         root->i_gid = make_kgid(current_user_ns(), option);
651                         if (!gid_valid(root->i_gid))
652                                 return 0;
653                         break;
654                 case Opt_mode:
655                         if (match_octal(&args[0], &option))
656                                 return 0;
657                         root->i_mode = option | S_IFDIR;
658                         break;
659                 case Opt_debug:
660                         spufs_get_sb_info(sb)->debug = 1;
661                         break;
662                 default:
663                         return 0;
664                 }
665         }
666         return 1;
667 }
668
669 static void spufs_exit_isolated_loader(void)
670 {
671         free_pages((unsigned long) isolated_loader,
672                         get_order(isolated_loader_size));
673 }
674
675 static void
676 spufs_init_isolated_loader(void)
677 {
678         struct device_node *dn;
679         const char *loader;
680         int size;
681
682         dn = of_find_node_by_path("/spu-isolation");
683         if (!dn)
684                 return;
685
686         loader = of_get_property(dn, "loader", &size);
687         if (!loader)
688                 return;
689
690         /* the loader must be align on a 16 byte boundary */
691         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
692         if (!isolated_loader)
693                 return;
694
695         isolated_loader_size = size;
696         memcpy(isolated_loader, loader, size);
697         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
698 }
699
700 static int
701 spufs_create_root(struct super_block *sb, void *data)
702 {
703         struct inode *inode;
704         int ret;
705
706         ret = -ENODEV;
707         if (!spu_management_ops)
708                 goto out;
709
710         ret = -ENOMEM;
711         inode = spufs_new_inode(sb, S_IFDIR | 0775);
712         if (!inode)
713                 goto out;
714
715         inode->i_op = &simple_dir_inode_operations;
716         inode->i_fop = &simple_dir_operations;
717         SPUFS_I(inode)->i_ctx = NULL;
718         inc_nlink(inode);
719
720         ret = -EINVAL;
721         if (!spufs_parse_options(sb, data, inode))
722                 goto out_iput;
723
724         ret = -ENOMEM;
725         sb->s_root = d_make_root(inode);
726         if (!sb->s_root)
727                 goto out;
728
729         return 0;
730 out_iput:
731         iput(inode);
732 out:
733         return ret;
734 }
735
736 static int
737 spufs_fill_super(struct super_block *sb, void *data, int silent)
738 {
739         struct spufs_sb_info *info;
740         static const struct super_operations s_ops = {
741                 .alloc_inode = spufs_alloc_inode,
742                 .destroy_inode = spufs_destroy_inode,
743                 .statfs = simple_statfs,
744                 .evict_inode = spufs_evict_inode,
745                 .show_options = spufs_show_options,
746         };
747
748         info = kzalloc(sizeof(*info), GFP_KERNEL);
749         if (!info)
750                 return -ENOMEM;
751
752         sb->s_maxbytes = MAX_LFS_FILESIZE;
753         sb->s_blocksize = PAGE_SIZE;
754         sb->s_blocksize_bits = PAGE_SHIFT;
755         sb->s_magic = SPUFS_MAGIC;
756         sb->s_op = &s_ops;
757         sb->s_fs_info = info;
758
759         return spufs_create_root(sb, data);
760 }
761
762 static struct dentry *
763 spufs_mount(struct file_system_type *fstype, int flags,
764                 const char *name, void *data)
765 {
766         return mount_single(fstype, flags, data, spufs_fill_super);
767 }
768
769 static struct file_system_type spufs_type = {
770         .owner = THIS_MODULE,
771         .name = "spufs",
772         .mount = spufs_mount,
773         .kill_sb = kill_litter_super,
774 };
775 MODULE_ALIAS_FS("spufs");
776
777 static int __init spufs_init(void)
778 {
779         int ret;
780
781         ret = -ENODEV;
782         if (!spu_management_ops)
783                 goto out;
784
785         ret = -ENOMEM;
786         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
787                         sizeof(struct spufs_inode_info), 0,
788                         SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
789
790         if (!spufs_inode_cache)
791                 goto out;
792         ret = spu_sched_init();
793         if (ret)
794                 goto out_cache;
795         ret = register_spu_syscalls(&spufs_calls);
796         if (ret)
797                 goto out_sched;
798         ret = register_filesystem(&spufs_type);
799         if (ret)
800                 goto out_syscalls;
801
802         spufs_init_isolated_loader();
803
804         return 0;
805
806 out_syscalls:
807         unregister_spu_syscalls(&spufs_calls);
808 out_sched:
809         spu_sched_exit();
810 out_cache:
811         kmem_cache_destroy(spufs_inode_cache);
812 out:
813         return ret;
814 }
815 module_init(spufs_init);
816
817 static void __exit spufs_exit(void)
818 {
819         spu_sched_exit();
820         spufs_exit_isolated_loader();
821         unregister_spu_syscalls(&spufs_calls);
822         unregister_filesystem(&spufs_type);
823         kmem_cache_destroy(spufs_inode_cache);
824 }
825 module_exit(spufs_exit);
826
827 MODULE_LICENSE("GPL");
828 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
829