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11#include <linux/file.h>
12#include <linux/fs.h>
13#include <linux/fs_context.h>
14#include <linux/fs_parser.h>
15#include <linux/fsnotify.h>
16#include <linux/backing-dev.h>
17#include <linux/init.h>
18#include <linux/ioctl.h>
19#include <linux/module.h>
20#include <linux/mount.h>
21#include <linux/namei.h>
22#include <linux/pagemap.h>
23#include <linux/poll.h>
24#include <linux/seq_file.h>
25#include <linux/slab.h>
26
27#include <asm/prom.h>
28#include <asm/spu.h>
29#include <asm/spu_priv1.h>
30#include <linux/uaccess.h>
31
32#include "spufs.h"
33
34struct spufs_sb_info {
35 bool debug;
36};
37
38static struct kmem_cache *spufs_inode_cache;
39char *isolated_loader;
40static int isolated_loader_size;
41
42static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
43{
44 return sb->s_fs_info;
45}
46
47static struct inode *
48spufs_alloc_inode(struct super_block *sb)
49{
50 struct spufs_inode_info *ei;
51
52 ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
53 if (!ei)
54 return NULL;
55
56 ei->i_gang = NULL;
57 ei->i_ctx = NULL;
58 ei->i_openers = 0;
59
60 return &ei->vfs_inode;
61}
62
63static void spufs_free_inode(struct inode *inode)
64{
65 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
66}
67
68static void
69spufs_init_once(void *p)
70{
71 struct spufs_inode_info *ei = p;
72
73 inode_init_once(&ei->vfs_inode);
74}
75
76static struct inode *
77spufs_new_inode(struct super_block *sb, umode_t mode)
78{
79 struct inode *inode;
80
81 inode = new_inode(sb);
82 if (!inode)
83 goto out;
84
85 inode->i_ino = get_next_ino();
86 inode->i_mode = mode;
87 inode->i_uid = current_fsuid();
88 inode->i_gid = current_fsgid();
89 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
90out:
91 return inode;
92}
93
94static int
95spufs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
96 struct iattr *attr)
97{
98 struct inode *inode = d_inode(dentry);
99
100 if ((attr->ia_valid & ATTR_SIZE) &&
101 (attr->ia_size != inode->i_size))
102 return -EINVAL;
103 setattr_copy(&init_user_ns, inode, attr);
104 mark_inode_dirty(inode);
105 return 0;
106}
107
108
109static int
110spufs_new_file(struct super_block *sb, struct dentry *dentry,
111 const struct file_operations *fops, umode_t mode,
112 size_t size, struct spu_context *ctx)
113{
114 static const struct inode_operations spufs_file_iops = {
115 .setattr = spufs_setattr,
116 };
117 struct inode *inode;
118 int ret;
119
120 ret = -ENOSPC;
121 inode = spufs_new_inode(sb, S_IFREG | mode);
122 if (!inode)
123 goto out;
124
125 ret = 0;
126 inode->i_op = &spufs_file_iops;
127 inode->i_fop = fops;
128 inode->i_size = size;
129 inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
130 d_add(dentry, inode);
131out:
132 return ret;
133}
134
135static void
136spufs_evict_inode(struct inode *inode)
137{
138 struct spufs_inode_info *ei = SPUFS_I(inode);
139 clear_inode(inode);
140 if (ei->i_ctx)
141 put_spu_context(ei->i_ctx);
142 if (ei->i_gang)
143 put_spu_gang(ei->i_gang);
144}
145
146static void spufs_prune_dir(struct dentry *dir)
147{
148 struct dentry *dentry, *tmp;
149
150 inode_lock(d_inode(dir));
151 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
152 spin_lock(&dentry->d_lock);
153 if (simple_positive(dentry)) {
154 dget_dlock(dentry);
155 __d_drop(dentry);
156 spin_unlock(&dentry->d_lock);
157 simple_unlink(d_inode(dir), dentry);
158
159
160
161 dput(dentry);
162 } else {
163 spin_unlock(&dentry->d_lock);
164 }
165 }
166 shrink_dcache_parent(dir);
167 inode_unlock(d_inode(dir));
168}
169
170
171static int spufs_rmdir(struct inode *parent, struct dentry *dir)
172{
173
174 int res;
175 spufs_prune_dir(dir);
176 d_drop(dir);
177 res = simple_rmdir(parent, dir);
178
179 spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
180 return res;
181}
182
183static int spufs_fill_dir(struct dentry *dir,
184 const struct spufs_tree_descr *files, umode_t mode,
185 struct spu_context *ctx)
186{
187 while (files->name && files->name[0]) {
188 int ret;
189 struct dentry *dentry = d_alloc_name(dir, files->name);
190 if (!dentry)
191 return -ENOMEM;
192 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
193 files->mode & mode, files->size, ctx);
194 if (ret)
195 return ret;
196 files++;
197 }
198 return 0;
199}
200
201static int spufs_dir_close(struct inode *inode, struct file *file)
202{
203 struct inode *parent;
204 struct dentry *dir;
205 int ret;
206
207 dir = file->f_path.dentry;
208 parent = d_inode(dir->d_parent);
209
210 inode_lock_nested(parent, I_MUTEX_PARENT);
211 ret = spufs_rmdir(parent, dir);
212 inode_unlock(parent);
213 WARN_ON(ret);
214
215 return dcache_dir_close(inode, file);
216}
217
218const struct file_operations spufs_context_fops = {
219 .open = dcache_dir_open,
220 .release = spufs_dir_close,
221 .llseek = dcache_dir_lseek,
222 .read = generic_read_dir,
223 .iterate_shared = dcache_readdir,
224 .fsync = noop_fsync,
225};
226EXPORT_SYMBOL_GPL(spufs_context_fops);
227
228static int
229spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
230 umode_t mode)
231{
232 int ret;
233 struct inode *inode;
234 struct spu_context *ctx;
235
236 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
237 if (!inode)
238 return -ENOSPC;
239
240 inode_init_owner(&init_user_ns, inode, dir, mode | S_IFDIR);
241 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang);
242 SPUFS_I(inode)->i_ctx = ctx;
243 if (!ctx) {
244 iput(inode);
245 return -ENOSPC;
246 }
247
248 ctx->flags = flags;
249 inode->i_op = &simple_dir_inode_operations;
250 inode->i_fop = &simple_dir_operations;
251
252 inode_lock(inode);
253
254 dget(dentry);
255 inc_nlink(dir);
256 inc_nlink(inode);
257
258 d_instantiate(dentry, inode);
259
260 if (flags & SPU_CREATE_NOSCHED)
261 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
262 mode, ctx);
263 else
264 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
265
266 if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
267 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
268 mode, ctx);
269
270 if (ret)
271 spufs_rmdir(dir, dentry);
272
273 inode_unlock(inode);
274
275 return ret;
276}
277
278static int spufs_context_open(struct path *path)
279{
280 int ret;
281 struct file *filp;
282
283 ret = get_unused_fd_flags(0);
284 if (ret < 0)
285 return ret;
286
287 filp = dentry_open(path, O_RDONLY, current_cred());
288 if (IS_ERR(filp)) {
289 put_unused_fd(ret);
290 return PTR_ERR(filp);
291 }
292
293 filp->f_op = &spufs_context_fops;
294 fd_install(ret, filp);
295 return ret;
296}
297
298static struct spu_context *
299spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
300 struct file *filp)
301{
302 struct spu_context *tmp, *neighbor, *err;
303 int count, node;
304 int aff_supp;
305
306 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
307 struct spu, cbe_list))->aff_list);
308
309 if (!aff_supp)
310 return ERR_PTR(-EINVAL);
311
312 if (flags & SPU_CREATE_GANG)
313 return ERR_PTR(-EINVAL);
314
315 if (flags & SPU_CREATE_AFFINITY_MEM &&
316 gang->aff_ref_ctx &&
317 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
318 return ERR_PTR(-EEXIST);
319
320 if (gang->aff_flags & AFF_MERGED)
321 return ERR_PTR(-EBUSY);
322
323 neighbor = NULL;
324 if (flags & SPU_CREATE_AFFINITY_SPU) {
325 if (!filp || filp->f_op != &spufs_context_fops)
326 return ERR_PTR(-EINVAL);
327
328 neighbor = get_spu_context(
329 SPUFS_I(file_inode(filp))->i_ctx);
330
331 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
332 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
333 !list_entry(neighbor->aff_list.next, struct spu_context,
334 aff_list)->aff_head) {
335 err = ERR_PTR(-EEXIST);
336 goto out_put_neighbor;
337 }
338
339 if (gang != neighbor->gang) {
340 err = ERR_PTR(-EINVAL);
341 goto out_put_neighbor;
342 }
343
344 count = 1;
345 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
346 count++;
347 if (list_empty(&neighbor->aff_list))
348 count++;
349
350 for (node = 0; node < MAX_NUMNODES; node++) {
351 if ((cbe_spu_info[node].n_spus - atomic_read(
352 &cbe_spu_info[node].reserved_spus)) >= count)
353 break;
354 }
355
356 if (node == MAX_NUMNODES) {
357 err = ERR_PTR(-EEXIST);
358 goto out_put_neighbor;
359 }
360 }
361
362 return neighbor;
363
364out_put_neighbor:
365 put_spu_context(neighbor);
366 return err;
367}
368
369static void
370spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
371 struct spu_context *neighbor)
372{
373 if (flags & SPU_CREATE_AFFINITY_MEM)
374 ctx->gang->aff_ref_ctx = ctx;
375
376 if (flags & SPU_CREATE_AFFINITY_SPU) {
377 if (list_empty(&neighbor->aff_list)) {
378 list_add_tail(&neighbor->aff_list,
379 &ctx->gang->aff_list_head);
380 neighbor->aff_head = 1;
381 }
382
383 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
384 || list_entry(neighbor->aff_list.next, struct spu_context,
385 aff_list)->aff_head) {
386 list_add(&ctx->aff_list, &neighbor->aff_list);
387 } else {
388 list_add_tail(&ctx->aff_list, &neighbor->aff_list);
389 if (neighbor->aff_head) {
390 neighbor->aff_head = 0;
391 ctx->aff_head = 1;
392 }
393 }
394
395 if (!ctx->gang->aff_ref_ctx)
396 ctx->gang->aff_ref_ctx = ctx;
397 }
398}
399
400static int
401spufs_create_context(struct inode *inode, struct dentry *dentry,
402 struct vfsmount *mnt, int flags, umode_t mode,
403 struct file *aff_filp)
404{
405 int ret;
406 int affinity;
407 struct spu_gang *gang;
408 struct spu_context *neighbor;
409 struct path path = {.mnt = mnt, .dentry = dentry};
410
411 if ((flags & SPU_CREATE_NOSCHED) &&
412 !capable(CAP_SYS_NICE))
413 return -EPERM;
414
415 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
416 == SPU_CREATE_ISOLATE)
417 return -EINVAL;
418
419 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
420 return -ENODEV;
421
422 gang = NULL;
423 neighbor = NULL;
424 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
425 if (affinity) {
426 gang = SPUFS_I(inode)->i_gang;
427 if (!gang)
428 return -EINVAL;
429 mutex_lock(&gang->aff_mutex);
430 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
431 if (IS_ERR(neighbor)) {
432 ret = PTR_ERR(neighbor);
433 goto out_aff_unlock;
434 }
435 }
436
437 ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
438 if (ret)
439 goto out_aff_unlock;
440
441 if (affinity) {
442 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
443 neighbor);
444 if (neighbor)
445 put_spu_context(neighbor);
446 }
447
448 ret = spufs_context_open(&path);
449 if (ret < 0)
450 WARN_ON(spufs_rmdir(inode, dentry));
451
452out_aff_unlock:
453 if (affinity)
454 mutex_unlock(&gang->aff_mutex);
455 return ret;
456}
457
458static int
459spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
460{
461 int ret;
462 struct inode *inode;
463 struct spu_gang *gang;
464
465 ret = -ENOSPC;
466 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
467 if (!inode)
468 goto out;
469
470 ret = 0;
471 inode_init_owner(&init_user_ns, inode, dir, mode | S_IFDIR);
472 gang = alloc_spu_gang();
473 SPUFS_I(inode)->i_ctx = NULL;
474 SPUFS_I(inode)->i_gang = gang;
475 if (!gang) {
476 ret = -ENOMEM;
477 goto out_iput;
478 }
479
480 inode->i_op = &simple_dir_inode_operations;
481 inode->i_fop = &simple_dir_operations;
482
483 d_instantiate(dentry, inode);
484 inc_nlink(dir);
485 inc_nlink(d_inode(dentry));
486 return ret;
487
488out_iput:
489 iput(inode);
490out:
491 return ret;
492}
493
494static int spufs_gang_open(struct path *path)
495{
496 int ret;
497 struct file *filp;
498
499 ret = get_unused_fd_flags(0);
500 if (ret < 0)
501 return ret;
502
503
504
505
506
507 filp = dentry_open(path, O_RDONLY, current_cred());
508 if (IS_ERR(filp)) {
509 put_unused_fd(ret);
510 return PTR_ERR(filp);
511 }
512
513 filp->f_op = &simple_dir_operations;
514 fd_install(ret, filp);
515 return ret;
516}
517
518static int spufs_create_gang(struct inode *inode,
519 struct dentry *dentry,
520 struct vfsmount *mnt, umode_t mode)
521{
522 struct path path = {.mnt = mnt, .dentry = dentry};
523 int ret;
524
525 ret = spufs_mkgang(inode, dentry, mode & 0777);
526 if (!ret) {
527 ret = spufs_gang_open(&path);
528 if (ret < 0) {
529 int err = simple_rmdir(inode, dentry);
530 WARN_ON(err);
531 }
532 }
533 return ret;
534}
535
536
537static struct file_system_type spufs_type;
538
539long spufs_create(struct path *path, struct dentry *dentry,
540 unsigned int flags, umode_t mode, struct file *filp)
541{
542 struct inode *dir = d_inode(path->dentry);
543 int ret;
544
545
546 if (path->dentry->d_sb->s_type != &spufs_type)
547 return -EINVAL;
548
549
550 if (flags & (~SPU_CREATE_FLAG_ALL))
551 return -EINVAL;
552
553
554 if (path->dentry != path->dentry->d_sb->s_root)
555 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
556 return -EINVAL;
557
558 mode &= ~current_umask();
559
560 if (flags & SPU_CREATE_GANG)
561 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
562 else
563 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
564 filp);
565 if (ret >= 0)
566 fsnotify_mkdir(dir, dentry);
567
568 return ret;
569}
570
571
572struct spufs_fs_context {
573 kuid_t uid;
574 kgid_t gid;
575 umode_t mode;
576};
577
578enum {
579 Opt_uid, Opt_gid, Opt_mode, Opt_debug,
580};
581
582static const struct fs_parameter_spec spufs_fs_parameters[] = {
583 fsparam_u32 ("gid", Opt_gid),
584 fsparam_u32oct ("mode", Opt_mode),
585 fsparam_u32 ("uid", Opt_uid),
586 fsparam_flag ("debug", Opt_debug),
587 {}
588};
589
590static int spufs_show_options(struct seq_file *m, struct dentry *root)
591{
592 struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
593 struct inode *inode = root->d_inode;
594
595 if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
596 seq_printf(m, ",uid=%u",
597 from_kuid_munged(&init_user_ns, inode->i_uid));
598 if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
599 seq_printf(m, ",gid=%u",
600 from_kgid_munged(&init_user_ns, inode->i_gid));
601 if ((inode->i_mode & S_IALLUGO) != 0775)
602 seq_printf(m, ",mode=%o", inode->i_mode);
603 if (sbi->debug)
604 seq_puts(m, ",debug");
605 return 0;
606}
607
608static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
609{
610 struct spufs_fs_context *ctx = fc->fs_private;
611 struct spufs_sb_info *sbi = fc->s_fs_info;
612 struct fs_parse_result result;
613 kuid_t uid;
614 kgid_t gid;
615 int opt;
616
617 opt = fs_parse(fc, spufs_fs_parameters, param, &result);
618 if (opt < 0)
619 return opt;
620
621 switch (opt) {
622 case Opt_uid:
623 uid = make_kuid(current_user_ns(), result.uint_32);
624 if (!uid_valid(uid))
625 return invalf(fc, "Unknown uid");
626 ctx->uid = uid;
627 break;
628 case Opt_gid:
629 gid = make_kgid(current_user_ns(), result.uint_32);
630 if (!gid_valid(gid))
631 return invalf(fc, "Unknown gid");
632 ctx->gid = gid;
633 break;
634 case Opt_mode:
635 ctx->mode = result.uint_32 & S_IALLUGO;
636 break;
637 case Opt_debug:
638 sbi->debug = true;
639 break;
640 }
641
642 return 0;
643}
644
645static void spufs_exit_isolated_loader(void)
646{
647 free_pages((unsigned long) isolated_loader,
648 get_order(isolated_loader_size));
649}
650
651static void __init
652spufs_init_isolated_loader(void)
653{
654 struct device_node *dn;
655 const char *loader;
656 int size;
657
658 dn = of_find_node_by_path("/spu-isolation");
659 if (!dn)
660 return;
661
662 loader = of_get_property(dn, "loader", &size);
663 if (!loader)
664 return;
665
666
667 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
668 if (!isolated_loader)
669 return;
670
671 isolated_loader_size = size;
672 memcpy(isolated_loader, loader, size);
673 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
674}
675
676static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
677{
678 struct spufs_fs_context *ctx = fc->fs_private;
679 struct inode *inode;
680
681 if (!spu_management_ops)
682 return -ENODEV;
683
684 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
685 if (!inode)
686 return -ENOMEM;
687
688 inode->i_uid = ctx->uid;
689 inode->i_gid = ctx->gid;
690 inode->i_op = &simple_dir_inode_operations;
691 inode->i_fop = &simple_dir_operations;
692 SPUFS_I(inode)->i_ctx = NULL;
693 inc_nlink(inode);
694
695 sb->s_root = d_make_root(inode);
696 if (!sb->s_root)
697 return -ENOMEM;
698 return 0;
699}
700
701static const struct super_operations spufs_ops = {
702 .alloc_inode = spufs_alloc_inode,
703 .free_inode = spufs_free_inode,
704 .statfs = simple_statfs,
705 .evict_inode = spufs_evict_inode,
706 .show_options = spufs_show_options,
707};
708
709static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
710{
711 sb->s_maxbytes = MAX_LFS_FILESIZE;
712 sb->s_blocksize = PAGE_SIZE;
713 sb->s_blocksize_bits = PAGE_SHIFT;
714 sb->s_magic = SPUFS_MAGIC;
715 sb->s_op = &spufs_ops;
716
717 return spufs_create_root(sb, fc);
718}
719
720static int spufs_get_tree(struct fs_context *fc)
721{
722 return get_tree_single(fc, spufs_fill_super);
723}
724
725static void spufs_free_fc(struct fs_context *fc)
726{
727 kfree(fc->s_fs_info);
728}
729
730static const struct fs_context_operations spufs_context_ops = {
731 .free = spufs_free_fc,
732 .parse_param = spufs_parse_param,
733 .get_tree = spufs_get_tree,
734};
735
736static int spufs_init_fs_context(struct fs_context *fc)
737{
738 struct spufs_fs_context *ctx;
739 struct spufs_sb_info *sbi;
740
741 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
742 if (!ctx)
743 goto nomem;
744
745 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
746 if (!sbi)
747 goto nomem_ctx;
748
749 ctx->uid = current_uid();
750 ctx->gid = current_gid();
751 ctx->mode = 0755;
752
753 fc->fs_private = ctx;
754 fc->s_fs_info = sbi;
755 fc->ops = &spufs_context_ops;
756 return 0;
757
758nomem_ctx:
759 kfree(ctx);
760nomem:
761 return -ENOMEM;
762}
763
764static struct file_system_type spufs_type = {
765 .owner = THIS_MODULE,
766 .name = "spufs",
767 .init_fs_context = spufs_init_fs_context,
768 .parameters = spufs_fs_parameters,
769 .kill_sb = kill_litter_super,
770};
771MODULE_ALIAS_FS("spufs");
772
773static int __init spufs_init(void)
774{
775 int ret;
776
777 ret = -ENODEV;
778 if (!spu_management_ops)
779 goto out;
780
781 ret = -ENOMEM;
782 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
783 sizeof(struct spufs_inode_info), 0,
784 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
785
786 if (!spufs_inode_cache)
787 goto out;
788 ret = spu_sched_init();
789 if (ret)
790 goto out_cache;
791 ret = register_spu_syscalls(&spufs_calls);
792 if (ret)
793 goto out_sched;
794 ret = register_filesystem(&spufs_type);
795 if (ret)
796 goto out_syscalls;
797
798 spufs_init_isolated_loader();
799
800 return 0;
801
802out_syscalls:
803 unregister_spu_syscalls(&spufs_calls);
804out_sched:
805 spu_sched_exit();
806out_cache:
807 kmem_cache_destroy(spufs_inode_cache);
808out:
809 return ret;
810}
811module_init(spufs_init);
812
813static void __exit spufs_exit(void)
814{
815 spu_sched_exit();
816 spufs_exit_isolated_loader();
817 unregister_spu_syscalls(&spufs_calls);
818 unregister_filesystem(&spufs_type);
819 kmem_cache_destroy(spufs_inode_cache);
820}
821module_exit(spufs_exit);
822
823MODULE_LICENSE("GPL");
824MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
825
826
