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Linux/arch/powerpc/platforms/cell/spufs/inode.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 
  3 /*
  4  * SPU file system
  5  *
  6  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
  7  *
  8  * Author: Arnd Bergmann <arndb@de.ibm.com>
  9  */
 10 
 11 #include <linux/file.h>
 12 #include <linux/fs.h>
 13 #include <linux/fsnotify.h>
 14 #include <linux/backing-dev.h>
 15 #include <linux/init.h>
 16 #include <linux/ioctl.h>
 17 #include <linux/module.h>
 18 #include <linux/mount.h>
 19 #include <linux/namei.h>
 20 #include <linux/pagemap.h>
 21 #include <linux/poll.h>
 22 #include <linux/slab.h>
 23 #include <linux/parser.h>
 24 
 25 #include <asm/prom.h>
 26 #include <asm/spu.h>
 27 #include <asm/spu_priv1.h>
 28 #include <linux/uaccess.h>
 29 
 30 #include "spufs.h"
 31 
 32 struct spufs_sb_info {
 33         int debug;
 34 };
 35 
 36 static struct kmem_cache *spufs_inode_cache;
 37 char *isolated_loader;
 38 static int isolated_loader_size;
 39 
 40 static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
 41 {
 42         return sb->s_fs_info;
 43 }
 44 
 45 static struct inode *
 46 spufs_alloc_inode(struct super_block *sb)
 47 {
 48         struct spufs_inode_info *ei;
 49 
 50         ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
 51         if (!ei)
 52                 return NULL;
 53 
 54         ei->i_gang = NULL;
 55         ei->i_ctx = NULL;
 56         ei->i_openers = 0;
 57 
 58         return &ei->vfs_inode;
 59 }
 60 
 61 static void spufs_free_inode(struct inode *inode)
 62 {
 63         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
 64 }
 65 
 66 static void
 67 spufs_init_once(void *p)
 68 {
 69         struct spufs_inode_info *ei = p;
 70 
 71         inode_init_once(&ei->vfs_inode);
 72 }
 73 
 74 static struct inode *
 75 spufs_new_inode(struct super_block *sb, umode_t mode)
 76 {
 77         struct inode *inode;
 78 
 79         inode = new_inode(sb);
 80         if (!inode)
 81                 goto out;
 82 
 83         inode->i_ino = get_next_ino();
 84         inode->i_mode = mode;
 85         inode->i_uid = current_fsuid();
 86         inode->i_gid = current_fsgid();
 87         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
 88 out:
 89         return inode;
 90 }
 91 
 92 static int
 93 spufs_setattr(struct dentry *dentry, struct iattr *attr)
 94 {
 95         struct inode *inode = d_inode(dentry);
 96 
 97         if ((attr->ia_valid & ATTR_SIZE) &&
 98             (attr->ia_size != inode->i_size))
 99                 return -EINVAL;
100         setattr_copy(inode, attr);
101         mark_inode_dirty(inode);
102         return 0;
103 }
104 
105 
106 static int
107 spufs_new_file(struct super_block *sb, struct dentry *dentry,
108                 const struct file_operations *fops, umode_t mode,
109                 size_t size, struct spu_context *ctx)
110 {
111         static const struct inode_operations spufs_file_iops = {
112                 .setattr = spufs_setattr,
113         };
114         struct inode *inode;
115         int ret;
116 
117         ret = -ENOSPC;
118         inode = spufs_new_inode(sb, S_IFREG | mode);
119         if (!inode)
120                 goto out;
121 
122         ret = 0;
123         inode->i_op = &spufs_file_iops;
124         inode->i_fop = fops;
125         inode->i_size = size;
126         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
127         d_add(dentry, inode);
128 out:
129         return ret;
130 }
131 
132 static void
133 spufs_evict_inode(struct inode *inode)
134 {
135         struct spufs_inode_info *ei = SPUFS_I(inode);
136         clear_inode(inode);
137         if (ei->i_ctx)
138                 put_spu_context(ei->i_ctx);
139         if (ei->i_gang)
140                 put_spu_gang(ei->i_gang);
141 }
142 
143 static void spufs_prune_dir(struct dentry *dir)
144 {
145         struct dentry *dentry, *tmp;
146 
147         inode_lock(d_inode(dir));
148         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
149                 spin_lock(&dentry->d_lock);
150                 if (simple_positive(dentry)) {
151                         dget_dlock(dentry);
152                         __d_drop(dentry);
153                         spin_unlock(&dentry->d_lock);
154                         simple_unlink(d_inode(dir), dentry);
155                         /* XXX: what was dcache_lock protecting here? Other
156                          * filesystems (IB, configfs) release dcache_lock
157                          * before unlink */
158                         dput(dentry);
159                 } else {
160                         spin_unlock(&dentry->d_lock);
161                 }
162         }
163         shrink_dcache_parent(dir);
164         inode_unlock(d_inode(dir));
165 }
166 
167 /* Caller must hold parent->i_mutex */
168 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
169 {
170         /* remove all entries */
171         int res;
172         spufs_prune_dir(dir);
173         d_drop(dir);
174         res = simple_rmdir(parent, dir);
175         /* We have to give up the mm_struct */
176         spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
177         return res;
178 }
179 
180 static int spufs_fill_dir(struct dentry *dir,
181                 const struct spufs_tree_descr *files, umode_t mode,
182                 struct spu_context *ctx)
183 {
184         while (files->name && files->name[0]) {
185                 int ret;
186                 struct dentry *dentry = d_alloc_name(dir, files->name);
187                 if (!dentry)
188                         return -ENOMEM;
189                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
190                                         files->mode & mode, files->size, ctx);
191                 if (ret)
192                         return ret;
193                 files++;
194         }
195         return 0;
196 }
197 
198 static int spufs_dir_close(struct inode *inode, struct file *file)
199 {
200         struct spu_context *ctx;
201         struct inode *parent;
202         struct dentry *dir;
203         int ret;
204 
205         dir = file->f_path.dentry;
206         parent = d_inode(dir->d_parent);
207         ctx = SPUFS_I(d_inode(dir))->i_ctx;
208 
209         inode_lock_nested(parent, I_MUTEX_PARENT);
210         ret = spufs_rmdir(parent, dir);
211         inode_unlock(parent);
212         WARN_ON(ret);
213 
214         return dcache_dir_close(inode, file);
215 }
216 
217 const struct file_operations spufs_context_fops = {
218         .open           = dcache_dir_open,
219         .release        = spufs_dir_close,
220         .llseek         = dcache_dir_lseek,
221         .read           = generic_read_dir,
222         .iterate_shared = dcache_readdir,
223         .fsync          = noop_fsync,
224 };
225 EXPORT_SYMBOL_GPL(spufs_context_fops);
226 
227 static int
228 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
229                 umode_t mode)
230 {
231         int ret;
232         struct inode *inode;
233         struct spu_context *ctx;
234 
235         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
236         if (!inode)
237                 return -ENOSPC;
238 
239         if (dir->i_mode & S_ISGID) {
240                 inode->i_gid = dir->i_gid;
241                 inode->i_mode &= S_ISGID;
242         }
243         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
244         SPUFS_I(inode)->i_ctx = ctx;
245         if (!ctx) {
246                 iput(inode);
247                 return -ENOSPC;
248         }
249 
250         ctx->flags = flags;
251         inode->i_op = &simple_dir_inode_operations;
252         inode->i_fop = &simple_dir_operations;
253 
254         inode_lock(inode);
255 
256         dget(dentry);
257         inc_nlink(dir);
258         inc_nlink(inode);
259 
260         d_instantiate(dentry, inode);
261 
262         if (flags & SPU_CREATE_NOSCHED)
263                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
264                                          mode, ctx);
265         else
266                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
267 
268         if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
269                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
270                                 mode, ctx);
271 
272         if (ret)
273                 spufs_rmdir(dir, dentry);
274 
275         inode_unlock(inode);
276 
277         return ret;
278 }
279 
280 static int spufs_context_open(struct path *path)
281 {
282         int ret;
283         struct file *filp;
284 
285         ret = get_unused_fd_flags(0);
286         if (ret < 0)
287                 return ret;
288 
289         filp = dentry_open(path, O_RDONLY, current_cred());
290         if (IS_ERR(filp)) {
291                 put_unused_fd(ret);
292                 return PTR_ERR(filp);
293         }
294 
295         filp->f_op = &spufs_context_fops;
296         fd_install(ret, filp);
297         return ret;
298 }
299 
300 static struct spu_context *
301 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
302                                                 struct file *filp)
303 {
304         struct spu_context *tmp, *neighbor, *err;
305         int count, node;
306         int aff_supp;
307 
308         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
309                                         struct spu, cbe_list))->aff_list);
310 
311         if (!aff_supp)
312                 return ERR_PTR(-EINVAL);
313 
314         if (flags & SPU_CREATE_GANG)
315                 return ERR_PTR(-EINVAL);
316 
317         if (flags & SPU_CREATE_AFFINITY_MEM &&
318             gang->aff_ref_ctx &&
319             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
320                 return ERR_PTR(-EEXIST);
321 
322         if (gang->aff_flags & AFF_MERGED)
323                 return ERR_PTR(-EBUSY);
324 
325         neighbor = NULL;
326         if (flags & SPU_CREATE_AFFINITY_SPU) {
327                 if (!filp || filp->f_op != &spufs_context_fops)
328                         return ERR_PTR(-EINVAL);
329 
330                 neighbor = get_spu_context(
331                                 SPUFS_I(file_inode(filp))->i_ctx);
332 
333                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
334                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
335                     !list_entry(neighbor->aff_list.next, struct spu_context,
336                     aff_list)->aff_head) {
337                         err = ERR_PTR(-EEXIST);
338                         goto out_put_neighbor;
339                 }
340 
341                 if (gang != neighbor->gang) {
342                         err = ERR_PTR(-EINVAL);
343                         goto out_put_neighbor;
344                 }
345 
346                 count = 1;
347                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
348                         count++;
349                 if (list_empty(&neighbor->aff_list))
350                         count++;
351 
352                 for (node = 0; node < MAX_NUMNODES; node++) {
353                         if ((cbe_spu_info[node].n_spus - atomic_read(
354                                 &cbe_spu_info[node].reserved_spus)) >= count)
355                                 break;
356                 }
357 
358                 if (node == MAX_NUMNODES) {
359                         err = ERR_PTR(-EEXIST);
360                         goto out_put_neighbor;
361                 }
362         }
363 
364         return neighbor;
365 
366 out_put_neighbor:
367         put_spu_context(neighbor);
368         return err;
369 }
370 
371 static void
372 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
373                                         struct spu_context *neighbor)
374 {
375         if (flags & SPU_CREATE_AFFINITY_MEM)
376                 ctx->gang->aff_ref_ctx = ctx;
377 
378         if (flags & SPU_CREATE_AFFINITY_SPU) {
379                 if (list_empty(&neighbor->aff_list)) {
380                         list_add_tail(&neighbor->aff_list,
381                                 &ctx->gang->aff_list_head);
382                         neighbor->aff_head = 1;
383                 }
384 
385                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
386                     || list_entry(neighbor->aff_list.next, struct spu_context,
387                                                         aff_list)->aff_head) {
388                         list_add(&ctx->aff_list, &neighbor->aff_list);
389                 } else  {
390                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
391                         if (neighbor->aff_head) {
392                                 neighbor->aff_head = 0;
393                                 ctx->aff_head = 1;
394                         }
395                 }
396 
397                 if (!ctx->gang->aff_ref_ctx)
398                         ctx->gang->aff_ref_ctx = ctx;
399         }
400 }
401 
402 static int
403 spufs_create_context(struct inode *inode, struct dentry *dentry,
404                         struct vfsmount *mnt, int flags, umode_t mode,
405                         struct file *aff_filp)
406 {
407         int ret;
408         int affinity;
409         struct spu_gang *gang;
410         struct spu_context *neighbor;
411         struct path path = {.mnt = mnt, .dentry = dentry};
412 
413         if ((flags & SPU_CREATE_NOSCHED) &&
414             !capable(CAP_SYS_NICE))
415                 return -EPERM;
416 
417         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
418             == SPU_CREATE_ISOLATE)
419                 return -EINVAL;
420 
421         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
422                 return -ENODEV;
423 
424         gang = NULL;
425         neighbor = NULL;
426         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
427         if (affinity) {
428                 gang = SPUFS_I(inode)->i_gang;
429                 if (!gang)
430                         return -EINVAL;
431                 mutex_lock(&gang->aff_mutex);
432                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
433                 if (IS_ERR(neighbor)) {
434                         ret = PTR_ERR(neighbor);
435                         goto out_aff_unlock;
436                 }
437         }
438 
439         ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
440         if (ret)
441                 goto out_aff_unlock;
442 
443         if (affinity) {
444                 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
445                                                                 neighbor);
446                 if (neighbor)
447                         put_spu_context(neighbor);
448         }
449 
450         ret = spufs_context_open(&path);
451         if (ret < 0)
452                 WARN_ON(spufs_rmdir(inode, dentry));
453 
454 out_aff_unlock:
455         if (affinity)
456                 mutex_unlock(&gang->aff_mutex);
457         return ret;
458 }
459 
460 static int
461 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
462 {
463         int ret;
464         struct inode *inode;
465         struct spu_gang *gang;
466 
467         ret = -ENOSPC;
468         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
469         if (!inode)
470                 goto out;
471 
472         ret = 0;
473         if (dir->i_mode & S_ISGID) {
474                 inode->i_gid = dir->i_gid;
475                 inode->i_mode &= S_ISGID;
476         }
477         gang = alloc_spu_gang();
478         SPUFS_I(inode)->i_ctx = NULL;
479         SPUFS_I(inode)->i_gang = gang;
480         if (!gang) {
481                 ret = -ENOMEM;
482                 goto out_iput;
483         }
484 
485         inode->i_op = &simple_dir_inode_operations;
486         inode->i_fop = &simple_dir_operations;
487 
488         d_instantiate(dentry, inode);
489         inc_nlink(dir);
490         inc_nlink(d_inode(dentry));
491         return ret;
492 
493 out_iput:
494         iput(inode);
495 out:
496         return ret;
497 }
498 
499 static int spufs_gang_open(struct path *path)
500 {
501         int ret;
502         struct file *filp;
503 
504         ret = get_unused_fd_flags(0);
505         if (ret < 0)
506                 return ret;
507 
508         /*
509          * get references for dget and mntget, will be released
510          * in error path of *_open().
511          */
512         filp = dentry_open(path, O_RDONLY, current_cred());
513         if (IS_ERR(filp)) {
514                 put_unused_fd(ret);
515                 return PTR_ERR(filp);
516         }
517 
518         filp->f_op = &simple_dir_operations;
519         fd_install(ret, filp);
520         return ret;
521 }
522 
523 static int spufs_create_gang(struct inode *inode,
524                         struct dentry *dentry,
525                         struct vfsmount *mnt, umode_t mode)
526 {
527         struct path path = {.mnt = mnt, .dentry = dentry};
528         int ret;
529 
530         ret = spufs_mkgang(inode, dentry, mode & 0777);
531         if (!ret) {
532                 ret = spufs_gang_open(&path);
533                 if (ret < 0) {
534                         int err = simple_rmdir(inode, dentry);
535                         WARN_ON(err);
536                 }
537         }
538         return ret;
539 }
540 
541 
542 static struct file_system_type spufs_type;
543 
544 long spufs_create(struct path *path, struct dentry *dentry,
545                 unsigned int flags, umode_t mode, struct file *filp)
546 {
547         struct inode *dir = d_inode(path->dentry);
548         int ret;
549 
550         /* check if we are on spufs */
551         if (path->dentry->d_sb->s_type != &spufs_type)
552                 return -EINVAL;
553 
554         /* don't accept undefined flags */
555         if (flags & (~SPU_CREATE_FLAG_ALL))
556                 return -EINVAL;
557 
558         /* only threads can be underneath a gang */
559         if (path->dentry != path->dentry->d_sb->s_root)
560                 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
561                         return -EINVAL;
562 
563         mode &= ~current_umask();
564 
565         if (flags & SPU_CREATE_GANG)
566                 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
567         else
568                 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
569                                             filp);
570         if (ret >= 0)
571                 fsnotify_mkdir(dir, dentry);
572 
573         return ret;
574 }
575 
576 /* File system initialization */
577 enum {
578         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
579 };
580 
581 static const match_table_t spufs_tokens = {
582         { Opt_uid,   "uid=%d" },
583         { Opt_gid,   "gid=%d" },
584         { Opt_mode,  "mode=%o" },
585         { Opt_debug, "debug" },
586         { Opt_err,    NULL  },
587 };
588 
589 static int spufs_show_options(struct seq_file *m, struct dentry *root)
590 {
591         struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
592         struct inode *inode = root->d_inode;
593 
594         if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
595                 seq_printf(m, ",uid=%u",
596                            from_kuid_munged(&init_user_ns, inode->i_uid));
597         if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
598                 seq_printf(m, ",gid=%u",
599                            from_kgid_munged(&init_user_ns, inode->i_gid));
600         if ((inode->i_mode & S_IALLUGO) != 0775)
601                 seq_printf(m, ",mode=%o", inode->i_mode);
602         if (sbi->debug)
603                 seq_puts(m, ",debug");
604         return 0;
605 }
606 
607 static int
608 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
609 {
610         char *p;
611         substring_t args[MAX_OPT_ARGS];
612 
613         while ((p = strsep(&options, ",")) != NULL) {
614                 int token, option;
615 
616                 if (!*p)
617                         continue;
618 
619                 token = match_token(p, spufs_tokens, args);
620                 switch (token) {
621                 case Opt_uid:
622                         if (match_int(&args[0], &option))
623                                 return 0;
624                         root->i_uid = make_kuid(current_user_ns(), option);
625                         if (!uid_valid(root->i_uid))
626                                 return 0;
627                         break;
628                 case Opt_gid:
629                         if (match_int(&args[0], &option))
630                                 return 0;
631                         root->i_gid = make_kgid(current_user_ns(), option);
632                         if (!gid_valid(root->i_gid))
633                                 return 0;
634                         break;
635                 case Opt_mode:
636                         if (match_octal(&args[0], &option))
637                                 return 0;
638                         root->i_mode = option | S_IFDIR;
639                         break;
640                 case Opt_debug:
641                         spufs_get_sb_info(sb)->debug = 1;
642                         break;
643                 default:
644                         return 0;
645                 }
646         }
647         return 1;
648 }
649 
650 static void spufs_exit_isolated_loader(void)
651 {
652         free_pages((unsigned long) isolated_loader,
653                         get_order(isolated_loader_size));
654 }
655 
656 static void
657 spufs_init_isolated_loader(void)
658 {
659         struct device_node *dn;
660         const char *loader;
661         int size;
662 
663         dn = of_find_node_by_path("/spu-isolation");
664         if (!dn)
665                 return;
666 
667         loader = of_get_property(dn, "loader", &size);
668         if (!loader)
669                 return;
670 
671         /* the loader must be align on a 16 byte boundary */
672         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
673         if (!isolated_loader)
674                 return;
675 
676         isolated_loader_size = size;
677         memcpy(isolated_loader, loader, size);
678         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
679 }
680 
681 static int
682 spufs_create_root(struct super_block *sb, void *data)
683 {
684         struct inode *inode;
685         int ret;
686 
687         ret = -ENODEV;
688         if (!spu_management_ops)
689                 goto out;
690 
691         ret = -ENOMEM;
692         inode = spufs_new_inode(sb, S_IFDIR | 0775);
693         if (!inode)
694                 goto out;
695 
696         inode->i_op = &simple_dir_inode_operations;
697         inode->i_fop = &simple_dir_operations;
698         SPUFS_I(inode)->i_ctx = NULL;
699         inc_nlink(inode);
700 
701         ret = -EINVAL;
702         if (!spufs_parse_options(sb, data, inode))
703                 goto out_iput;
704 
705         ret = -ENOMEM;
706         sb->s_root = d_make_root(inode);
707         if (!sb->s_root)
708                 goto out;
709 
710         return 0;
711 out_iput:
712         iput(inode);
713 out:
714         return ret;
715 }
716 
717 static int
718 spufs_fill_super(struct super_block *sb, void *data, int silent)
719 {
720         struct spufs_sb_info *info;
721         static const struct super_operations s_ops = {
722                 .alloc_inode = spufs_alloc_inode,
723                 .free_inode = spufs_free_inode,
724                 .statfs = simple_statfs,
725                 .evict_inode = spufs_evict_inode,
726                 .show_options = spufs_show_options,
727         };
728 
729         info = kzalloc(sizeof(*info), GFP_KERNEL);
730         if (!info)
731                 return -ENOMEM;
732 
733         sb->s_maxbytes = MAX_LFS_FILESIZE;
734         sb->s_blocksize = PAGE_SIZE;
735         sb->s_blocksize_bits = PAGE_SHIFT;
736         sb->s_magic = SPUFS_MAGIC;
737         sb->s_op = &s_ops;
738         sb->s_fs_info = info;
739 
740         return spufs_create_root(sb, data);
741 }
742 
743 static struct dentry *
744 spufs_mount(struct file_system_type *fstype, int flags,
745                 const char *name, void *data)
746 {
747         return mount_single(fstype, flags, data, spufs_fill_super);
748 }
749 
750 static struct file_system_type spufs_type = {
751         .owner = THIS_MODULE,
752         .name = "spufs",
753         .mount = spufs_mount,
754         .kill_sb = kill_litter_super,
755 };
756 MODULE_ALIAS_FS("spufs");
757 
758 static int __init spufs_init(void)
759 {
760         int ret;
761 
762         ret = -ENODEV;
763         if (!spu_management_ops)
764                 goto out;
765 
766         ret = -ENOMEM;
767         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
768                         sizeof(struct spufs_inode_info), 0,
769                         SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
770 
771         if (!spufs_inode_cache)
772                 goto out;
773         ret = spu_sched_init();
774         if (ret)
775                 goto out_cache;
776         ret = register_spu_syscalls(&spufs_calls);
777         if (ret)
778                 goto out_sched;
779         ret = register_filesystem(&spufs_type);
780         if (ret)
781                 goto out_syscalls;
782 
783         spufs_init_isolated_loader();
784 
785         return 0;
786 
787 out_syscalls:
788         unregister_spu_syscalls(&spufs_calls);
789 out_sched:
790         spu_sched_exit();
791 out_cache:
792         kmem_cache_destroy(spufs_inode_cache);
793 out:
794         return ret;
795 }
796 module_init(spufs_init);
797 
798 static void __exit spufs_exit(void)
799 {
800         spu_sched_exit();
801         spufs_exit_isolated_loader();
802         unregister_spu_syscalls(&spufs_calls);
803         unregister_filesystem(&spufs_type);
804         kmem_cache_destroy(spufs_inode_cache);
805 }
806 module_exit(spufs_exit);
807 
808 MODULE_LICENSE("GPL");
809 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
810 
811 

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