Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/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         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;
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, 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         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         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(dir->d_inode)->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 = dir->d_parent->d_inode;
226         ctx = SPUFS_I(dir->d_inode)->i_ctx;
227 
228         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
229         ret = spufs_rmdir(parent, dir);
230         mutex_unlock(&parent->i_mutex);
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        = 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         mutex_lock(&inode->i_mutex);
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         mutex_unlock(&inode->i_mutex);
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();
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 & S_IRWXUGO);
459         if (ret)
460                 goto out_aff_unlock;
461 
462         if (affinity) {
463                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->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                 goto out_iput;
501 
502         inode->i_op = &simple_dir_inode_operations;
503         inode->i_fop = &simple_dir_operations;
504 
505         d_instantiate(dentry, inode);
506         inc_nlink(dir);
507         inc_nlink(dentry->d_inode);
508         return ret;
509 
510 out_iput:
511         iput(inode);
512 out:
513         return ret;
514 }
515 
516 static int spufs_gang_open(struct path *path)
517 {
518         int ret;
519         struct file *filp;
520 
521         ret = get_unused_fd();
522         if (ret < 0)
523                 return ret;
524 
525         /*
526          * get references for dget and mntget, will be released
527          * in error path of *_open().
528          */
529         filp = dentry_open(path, O_RDONLY, current_cred());
530         if (IS_ERR(filp)) {
531                 put_unused_fd(ret);
532                 return PTR_ERR(filp);
533         }
534 
535         filp->f_op = &simple_dir_operations;
536         fd_install(ret, filp);
537         return ret;
538 }
539 
540 static int spufs_create_gang(struct inode *inode,
541                         struct dentry *dentry,
542                         struct vfsmount *mnt, umode_t mode)
543 {
544         struct path path = {.mnt = mnt, .dentry = dentry};
545         int ret;
546 
547         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
548         if (!ret) {
549                 ret = spufs_gang_open(&path);
550                 if (ret < 0) {
551                         int err = simple_rmdir(inode, dentry);
552                         WARN_ON(err);
553                 }
554         }
555         return ret;
556 }
557 
558 
559 static struct file_system_type spufs_type;
560 
561 long spufs_create(struct path *path, struct dentry *dentry,
562                 unsigned int flags, umode_t mode, struct file *filp)
563 {
564         struct inode *dir = path->dentry->d_inode;
565         int ret;
566 
567         /* check if we are on spufs */
568         if (path->dentry->d_sb->s_type != &spufs_type)
569                 return -EINVAL;
570 
571         /* don't accept undefined flags */
572         if (flags & (~SPU_CREATE_FLAG_ALL))
573                 return -EINVAL;
574 
575         /* only threads can be underneath a gang */
576         if (path->dentry != path->dentry->d_sb->s_root)
577                 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
578                         return -EINVAL;
579 
580         mode &= ~current_umask();
581 
582         if (flags & SPU_CREATE_GANG)
583                 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
584         else
585                 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
586                                             filp);
587         if (ret >= 0)
588                 fsnotify_mkdir(dir, dentry);
589 
590         return ret;
591 }
592 
593 /* File system initialization */
594 enum {
595         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
596 };
597 
598 static const match_table_t spufs_tokens = {
599         { Opt_uid,   "uid=%d" },
600         { Opt_gid,   "gid=%d" },
601         { Opt_mode,  "mode=%o" },
602         { Opt_debug, "debug" },
603         { Opt_err,    NULL  },
604 };
605 
606 static int
607 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
608 {
609         char *p;
610         substring_t args[MAX_OPT_ARGS];
611 
612         while ((p = strsep(&options, ",")) != NULL) {
613                 int token, option;
614 
615                 if (!*p)
616                         continue;
617 
618                 token = match_token(p, spufs_tokens, args);
619                 switch (token) {
620                 case Opt_uid:
621                         if (match_int(&args[0], &option))
622                                 return 0;
623                         root->i_uid = make_kuid(current_user_ns(), option);
624                         if (!uid_valid(root->i_uid))
625                                 return 0;
626                         break;
627                 case Opt_gid:
628                         if (match_int(&args[0], &option))
629                                 return 0;
630                         root->i_gid = make_kgid(current_user_ns(), option);
631                         if (!gid_valid(root->i_gid))
632                                 return 0;
633                         break;
634                 case Opt_mode:
635                         if (match_octal(&args[0], &option))
636                                 return 0;
637                         root->i_mode = option | S_IFDIR;
638                         break;
639                 case Opt_debug:
640                         spufs_get_sb_info(sb)->debug = 1;
641                         break;
642                 default:
643                         return 0;
644                 }
645         }
646         return 1;
647 }
648 
649 static void spufs_exit_isolated_loader(void)
650 {
651         free_pages((unsigned long) isolated_loader,
652                         get_order(isolated_loader_size));
653 }
654 
655 static void
656 spufs_init_isolated_loader(void)
657 {
658         struct device_node *dn;
659         const char *loader;
660         int size;
661 
662         dn = of_find_node_by_path("/spu-isolation");
663         if (!dn)
664                 return;
665 
666         loader = of_get_property(dn, "loader", &size);
667         if (!loader)
668                 return;
669 
670         /* the loader must be align on a 16 byte boundary */
671         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
672         if (!isolated_loader)
673                 return;
674 
675         isolated_loader_size = size;
676         memcpy(isolated_loader, loader, size);
677         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
678 }
679 
680 static int
681 spufs_create_root(struct super_block *sb, void *data)
682 {
683         struct inode *inode;
684         int ret;
685 
686         ret = -ENODEV;
687         if (!spu_management_ops)
688                 goto out;
689 
690         ret = -ENOMEM;
691         inode = spufs_new_inode(sb, S_IFDIR | 0775);
692         if (!inode)
693                 goto out;
694 
695         inode->i_op = &simple_dir_inode_operations;
696         inode->i_fop = &simple_dir_operations;
697         SPUFS_I(inode)->i_ctx = NULL;
698         inc_nlink(inode);
699 
700         ret = -EINVAL;
701         if (!spufs_parse_options(sb, data, inode))
702                 goto out_iput;
703 
704         ret = -ENOMEM;
705         sb->s_root = d_make_root(inode);
706         if (!sb->s_root)
707                 goto out;
708 
709         return 0;
710 out_iput:
711         iput(inode);
712 out:
713         return ret;
714 }
715 
716 static int
717 spufs_fill_super(struct super_block *sb, void *data, int silent)
718 {
719         struct spufs_sb_info *info;
720         static const struct super_operations s_ops = {
721                 .alloc_inode = spufs_alloc_inode,
722                 .destroy_inode = spufs_destroy_inode,
723                 .statfs = simple_statfs,
724                 .evict_inode = spufs_evict_inode,
725                 .show_options = generic_show_options,
726         };
727 
728         save_mount_options(sb, data);
729 
730         info = kzalloc(sizeof(*info), GFP_KERNEL);
731         if (!info)
732                 return -ENOMEM;
733 
734         sb->s_maxbytes = MAX_LFS_FILESIZE;
735         sb->s_blocksize = PAGE_CACHE_SIZE;
736         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
737         sb->s_magic = SPUFS_MAGIC;
738         sb->s_op = &s_ops;
739         sb->s_fs_info = info;
740 
741         return spufs_create_root(sb, data);
742 }
743 
744 static struct dentry *
745 spufs_mount(struct file_system_type *fstype, int flags,
746                 const char *name, void *data)
747 {
748         return mount_single(fstype, flags, data, spufs_fill_super);
749 }
750 
751 static struct file_system_type spufs_type = {
752         .owner = THIS_MODULE,
753         .name = "spufs",
754         .mount = spufs_mount,
755         .kill_sb = kill_litter_super,
756 };
757 MODULE_ALIAS_FS("spufs");
758 
759 static int __init spufs_init(void)
760 {
761         int ret;
762 
763         ret = -ENODEV;
764         if (!spu_management_ops)
765                 goto out;
766 
767         ret = -ENOMEM;
768         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
769                         sizeof(struct spufs_inode_info), 0,
770                         SLAB_HWCACHE_ALIGN, spufs_init_once);
771 
772         if (!spufs_inode_cache)
773                 goto out;
774         ret = spu_sched_init();
775         if (ret)
776                 goto out_cache;
777         ret = register_spu_syscalls(&spufs_calls);
778         if (ret)
779                 goto out_sched;
780         ret = register_filesystem(&spufs_type);
781         if (ret)
782                 goto out_syscalls;
783 
784         spufs_init_isolated_loader();
785 
786         return 0;
787 
788 out_syscalls:
789         unregister_spu_syscalls(&spufs_calls);
790 out_sched:
791         spu_sched_exit();
792 out_cache:
793         kmem_cache_destroy(spufs_inode_cache);
794 out:
795         return ret;
796 }
797 module_init(spufs_init);
798 
799 static void __exit spufs_exit(void)
800 {
801         spu_sched_exit();
802         spufs_exit_isolated_loader();
803         unregister_spu_syscalls(&spufs_calls);
804         unregister_filesystem(&spufs_type);
805         kmem_cache_destroy(spufs_inode_cache);
806 }
807 module_exit(spufs_exit);
808 
809 MODULE_LICENSE("GPL");
810 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
811 
812 

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