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
spufs_get_sb_info(struct super_block * sb)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 *
spufs_alloc_inode(struct super_block * sb)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
spufs_i_callback(struct rcu_head * head)74 static void spufs_i_callback(struct rcu_head *head)
75 {
76 struct inode *inode = container_of(head, struct inode, i_rcu);
77 INIT_LIST_HEAD(&inode->i_dentry);
78 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
79 }
80
spufs_destroy_inode(struct inode * inode)81 static void spufs_destroy_inode(struct inode *inode)
82 {
83 call_rcu(&inode->i_rcu, spufs_i_callback);
84 }
85
86 static void
spufs_init_once(void * p)87 spufs_init_once(void *p)
88 {
89 struct spufs_inode_info *ei = p;
90
91 inode_init_once(&ei->vfs_inode);
92 }
93
94 static struct inode *
spufs_new_inode(struct super_block * sb,int mode)95 spufs_new_inode(struct super_block *sb, int mode)
96 {
97 struct inode *inode;
98
99 inode = new_inode(sb);
100 if (!inode)
101 goto out;
102
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
spufs_setattr(struct dentry * dentry,struct iattr * attr)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
spufs_new_file(struct super_block * sb,struct dentry * dentry,const struct file_operations * fops,int mode,size_t size,struct spu_context * ctx)126 spufs_new_file(struct super_block *sb, struct dentry *dentry,
127 const struct file_operations *fops, int 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
spufs_evict_inode(struct inode * inode)152 spufs_evict_inode(struct inode *inode)
153 {
154 struct spufs_inode_info *ei = SPUFS_I(inode);
155 end_writeback(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
spufs_prune_dir(struct dentry * dir)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 */
spufs_rmdir(struct inode * parent,struct dentry * dir)187 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
188 {
189 /* remove all entries */
190 spufs_prune_dir(dir);
191 d_drop(dir);
192
193 return simple_rmdir(parent, dir);
194 }
195
spufs_fill_dir(struct dentry * dir,const struct spufs_tree_descr * files,int mode,struct spu_context * ctx)196 static int spufs_fill_dir(struct dentry *dir,
197 const struct spufs_tree_descr *files, int mode,
198 struct spu_context *ctx)
199 {
200 struct dentry *dentry, *tmp;
201 int ret;
202
203 while (files->name && files->name[0]) {
204 ret = -ENOMEM;
205 dentry = d_alloc_name(dir, files->name);
206 if (!dentry)
207 goto out;
208 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
209 files->mode & mode, files->size, ctx);
210 if (ret)
211 goto out;
212 files++;
213 }
214 return 0;
215 out:
216 /*
217 * remove all children from dir. dir->inode is not set so don't
218 * just simply use spufs_prune_dir() and panic afterwards :)
219 * dput() looks like it will do the right thing:
220 * - dec parent's ref counter
221 * - remove child from parent's child list
222 * - free child's inode if possible
223 * - free child
224 */
225 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
226 dput(dentry);
227 }
228
229 shrink_dcache_parent(dir);
230 return ret;
231 }
232
spufs_dir_close(struct inode * inode,struct file * file)233 static int spufs_dir_close(struct inode *inode, struct file *file)
234 {
235 struct spu_context *ctx;
236 struct inode *parent;
237 struct dentry *dir;
238 int ret;
239
240 dir = file->f_path.dentry;
241 parent = dir->d_parent->d_inode;
242 ctx = SPUFS_I(dir->d_inode)->i_ctx;
243
244 mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
245 ret = spufs_rmdir(parent, dir);
246 mutex_unlock(&parent->i_mutex);
247 WARN_ON(ret);
248
249 /* We have to give up the mm_struct */
250 spu_forget(ctx);
251
252 return dcache_dir_close(inode, file);
253 }
254
255 const struct file_operations spufs_context_fops = {
256 .open = dcache_dir_open,
257 .release = spufs_dir_close,
258 .llseek = dcache_dir_lseek,
259 .read = generic_read_dir,
260 .readdir = dcache_readdir,
261 .fsync = noop_fsync,
262 };
263 EXPORT_SYMBOL_GPL(spufs_context_fops);
264
265 static int
spufs_mkdir(struct inode * dir,struct dentry * dentry,unsigned int flags,int mode)266 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
267 int mode)
268 {
269 int ret;
270 struct inode *inode;
271 struct spu_context *ctx;
272
273 ret = -ENOSPC;
274 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
275 if (!inode)
276 goto out;
277
278 if (dir->i_mode & S_ISGID) {
279 inode->i_gid = dir->i_gid;
280 inode->i_mode &= S_ISGID;
281 }
282 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
283 SPUFS_I(inode)->i_ctx = ctx;
284 if (!ctx)
285 goto out_iput;
286
287 ctx->flags = flags;
288 inode->i_op = &simple_dir_inode_operations;
289 inode->i_fop = &simple_dir_operations;
290 if (flags & SPU_CREATE_NOSCHED)
291 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
292 mode, ctx);
293 else
294 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
295
296 if (ret)
297 goto out_free_ctx;
298
299 if (spufs_get_sb_info(dir->i_sb)->debug)
300 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
301 mode, ctx);
302
303 if (ret)
304 goto out_free_ctx;
305
306 d_instantiate(dentry, inode);
307 dget(dentry);
308 inc_nlink(dir);
309 inc_nlink(dentry->d_inode);
310 goto out;
311
312 out_free_ctx:
313 spu_forget(ctx);
314 put_spu_context(ctx);
315 out_iput:
316 iput(inode);
317 out:
318 return ret;
319 }
320
spufs_context_open(struct dentry * dentry,struct vfsmount * mnt)321 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
322 {
323 int ret;
324 struct file *filp;
325
326 ret = get_unused_fd();
327 if (ret < 0) {
328 dput(dentry);
329 mntput(mnt);
330 goto out;
331 }
332
333 filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
334 if (IS_ERR(filp)) {
335 put_unused_fd(ret);
336 ret = PTR_ERR(filp);
337 goto out;
338 }
339
340 filp->f_op = &spufs_context_fops;
341 fd_install(ret, filp);
342 out:
343 return ret;
344 }
345
346 static struct spu_context *
spufs_assert_affinity(unsigned int flags,struct spu_gang * gang,struct file * filp)347 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
348 struct file *filp)
349 {
350 struct spu_context *tmp, *neighbor, *err;
351 int count, node;
352 int aff_supp;
353
354 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
355 struct spu, cbe_list))->aff_list);
356
357 if (!aff_supp)
358 return ERR_PTR(-EINVAL);
359
360 if (flags & SPU_CREATE_GANG)
361 return ERR_PTR(-EINVAL);
362
363 if (flags & SPU_CREATE_AFFINITY_MEM &&
364 gang->aff_ref_ctx &&
365 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
366 return ERR_PTR(-EEXIST);
367
368 if (gang->aff_flags & AFF_MERGED)
369 return ERR_PTR(-EBUSY);
370
371 neighbor = NULL;
372 if (flags & SPU_CREATE_AFFINITY_SPU) {
373 if (!filp || filp->f_op != &spufs_context_fops)
374 return ERR_PTR(-EINVAL);
375
376 neighbor = get_spu_context(
377 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
378
379 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
380 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
381 !list_entry(neighbor->aff_list.next, struct spu_context,
382 aff_list)->aff_head) {
383 err = ERR_PTR(-EEXIST);
384 goto out_put_neighbor;
385 }
386
387 if (gang != neighbor->gang) {
388 err = ERR_PTR(-EINVAL);
389 goto out_put_neighbor;
390 }
391
392 count = 1;
393 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
394 count++;
395 if (list_empty(&neighbor->aff_list))
396 count++;
397
398 for (node = 0; node < MAX_NUMNODES; node++) {
399 if ((cbe_spu_info[node].n_spus - atomic_read(
400 &cbe_spu_info[node].reserved_spus)) >= count)
401 break;
402 }
403
404 if (node == MAX_NUMNODES) {
405 err = ERR_PTR(-EEXIST);
406 goto out_put_neighbor;
407 }
408 }
409
410 return neighbor;
411
412 out_put_neighbor:
413 put_spu_context(neighbor);
414 return err;
415 }
416
417 static void
spufs_set_affinity(unsigned int flags,struct spu_context * ctx,struct spu_context * neighbor)418 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
419 struct spu_context *neighbor)
420 {
421 if (flags & SPU_CREATE_AFFINITY_MEM)
422 ctx->gang->aff_ref_ctx = ctx;
423
424 if (flags & SPU_CREATE_AFFINITY_SPU) {
425 if (list_empty(&neighbor->aff_list)) {
426 list_add_tail(&neighbor->aff_list,
427 &ctx->gang->aff_list_head);
428 neighbor->aff_head = 1;
429 }
430
431 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
432 || list_entry(neighbor->aff_list.next, struct spu_context,
433 aff_list)->aff_head) {
434 list_add(&ctx->aff_list, &neighbor->aff_list);
435 } else {
436 list_add_tail(&ctx->aff_list, &neighbor->aff_list);
437 if (neighbor->aff_head) {
438 neighbor->aff_head = 0;
439 ctx->aff_head = 1;
440 }
441 }
442
443 if (!ctx->gang->aff_ref_ctx)
444 ctx->gang->aff_ref_ctx = ctx;
445 }
446 }
447
448 static int
spufs_create_context(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,int flags,int mode,struct file * aff_filp)449 spufs_create_context(struct inode *inode, struct dentry *dentry,
450 struct vfsmount *mnt, int flags, int mode,
451 struct file *aff_filp)
452 {
453 int ret;
454 int affinity;
455 struct spu_gang *gang;
456 struct spu_context *neighbor;
457
458 ret = -EPERM;
459 if ((flags & SPU_CREATE_NOSCHED) &&
460 !capable(CAP_SYS_NICE))
461 goto out_unlock;
462
463 ret = -EINVAL;
464 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
465 == SPU_CREATE_ISOLATE)
466 goto out_unlock;
467
468 ret = -ENODEV;
469 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
470 goto out_unlock;
471
472 gang = NULL;
473 neighbor = NULL;
474 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
475 if (affinity) {
476 gang = SPUFS_I(inode)->i_gang;
477 ret = -EINVAL;
478 if (!gang)
479 goto out_unlock;
480 mutex_lock(&gang->aff_mutex);
481 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
482 if (IS_ERR(neighbor)) {
483 ret = PTR_ERR(neighbor);
484 goto out_aff_unlock;
485 }
486 }
487
488 ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
489 if (ret)
490 goto out_aff_unlock;
491
492 if (affinity) {
493 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
494 neighbor);
495 if (neighbor)
496 put_spu_context(neighbor);
497 }
498
499 /*
500 * get references for dget and mntget, will be released
501 * in error path of *_open().
502 */
503 ret = spufs_context_open(dget(dentry), mntget(mnt));
504 if (ret < 0) {
505 WARN_ON(spufs_rmdir(inode, dentry));
506 if (affinity)
507 mutex_unlock(&gang->aff_mutex);
508 mutex_unlock(&inode->i_mutex);
509 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
510 goto out;
511 }
512
513 out_aff_unlock:
514 if (affinity)
515 mutex_unlock(&gang->aff_mutex);
516 out_unlock:
517 mutex_unlock(&inode->i_mutex);
518 out:
519 dput(dentry);
520 return ret;
521 }
522
523 static int
spufs_mkgang(struct inode * dir,struct dentry * dentry,int mode)524 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
525 {
526 int ret;
527 struct inode *inode;
528 struct spu_gang *gang;
529
530 ret = -ENOSPC;
531 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
532 if (!inode)
533 goto out;
534
535 ret = 0;
536 if (dir->i_mode & S_ISGID) {
537 inode->i_gid = dir->i_gid;
538 inode->i_mode &= S_ISGID;
539 }
540 gang = alloc_spu_gang();
541 SPUFS_I(inode)->i_ctx = NULL;
542 SPUFS_I(inode)->i_gang = gang;
543 if (!gang)
544 goto out_iput;
545
546 inode->i_op = &simple_dir_inode_operations;
547 inode->i_fop = &simple_dir_operations;
548
549 d_instantiate(dentry, inode);
550 inc_nlink(dir);
551 inc_nlink(dentry->d_inode);
552 return ret;
553
554 out_iput:
555 iput(inode);
556 out:
557 return ret;
558 }
559
spufs_gang_open(struct dentry * dentry,struct vfsmount * mnt)560 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
561 {
562 int ret;
563 struct file *filp;
564
565 ret = get_unused_fd();
566 if (ret < 0) {
567 dput(dentry);
568 mntput(mnt);
569 goto out;
570 }
571
572 filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
573 if (IS_ERR(filp)) {
574 put_unused_fd(ret);
575 ret = PTR_ERR(filp);
576 goto out;
577 }
578
579 filp->f_op = &simple_dir_operations;
580 fd_install(ret, filp);
581 out:
582 return ret;
583 }
584
spufs_create_gang(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,int mode)585 static int spufs_create_gang(struct inode *inode,
586 struct dentry *dentry,
587 struct vfsmount *mnt, int mode)
588 {
589 int ret;
590
591 ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
592 if (ret)
593 goto out;
594
595 /*
596 * get references for dget and mntget, will be released
597 * in error path of *_open().
598 */
599 ret = spufs_gang_open(dget(dentry), mntget(mnt));
600 if (ret < 0) {
601 int err = simple_rmdir(inode, dentry);
602 WARN_ON(err);
603 }
604
605 out:
606 mutex_unlock(&inode->i_mutex);
607 dput(dentry);
608 return ret;
609 }
610
611
612 static struct file_system_type spufs_type;
613
spufs_create(struct nameidata * nd,unsigned int flags,mode_t mode,struct file * filp)614 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
615 struct file *filp)
616 {
617 struct dentry *dentry;
618 int ret;
619
620 ret = -EINVAL;
621 /* check if we are on spufs */
622 if (nd->path.dentry->d_sb->s_type != &spufs_type)
623 goto out;
624
625 /* don't accept undefined flags */
626 if (flags & (~SPU_CREATE_FLAG_ALL))
627 goto out;
628
629 /* only threads can be underneath a gang */
630 if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
631 if ((flags & SPU_CREATE_GANG) ||
632 !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
633 goto out;
634 }
635
636 dentry = lookup_create(nd, 1);
637 ret = PTR_ERR(dentry);
638 if (IS_ERR(dentry))
639 goto out_dir;
640
641 mode &= ~current_umask();
642
643 if (flags & SPU_CREATE_GANG)
644 ret = spufs_create_gang(nd->path.dentry->d_inode,
645 dentry, nd->path.mnt, mode);
646 else
647 ret = spufs_create_context(nd->path.dentry->d_inode,
648 dentry, nd->path.mnt, flags, mode,
649 filp);
650 if (ret >= 0)
651 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
652 return ret;
653
654 out_dir:
655 mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
656 out:
657 return ret;
658 }
659
660 /* File system initialization */
661 enum {
662 Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
663 };
664
665 static const match_table_t spufs_tokens = {
666 { Opt_uid, "uid=%d" },
667 { Opt_gid, "gid=%d" },
668 { Opt_mode, "mode=%o" },
669 { Opt_debug, "debug" },
670 { Opt_err, NULL },
671 };
672
673 static int
spufs_parse_options(struct super_block * sb,char * options,struct inode * root)674 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
675 {
676 char *p;
677 substring_t args[MAX_OPT_ARGS];
678
679 while ((p = strsep(&options, ",")) != NULL) {
680 int token, option;
681
682 if (!*p)
683 continue;
684
685 token = match_token(p, spufs_tokens, args);
686 switch (token) {
687 case Opt_uid:
688 if (match_int(&args[0], &option))
689 return 0;
690 root->i_uid = option;
691 break;
692 case Opt_gid:
693 if (match_int(&args[0], &option))
694 return 0;
695 root->i_gid = option;
696 break;
697 case Opt_mode:
698 if (match_octal(&args[0], &option))
699 return 0;
700 root->i_mode = option | S_IFDIR;
701 break;
702 case Opt_debug:
703 spufs_get_sb_info(sb)->debug = 1;
704 break;
705 default:
706 return 0;
707 }
708 }
709 return 1;
710 }
711
spufs_exit_isolated_loader(void)712 static void spufs_exit_isolated_loader(void)
713 {
714 free_pages((unsigned long) isolated_loader,
715 get_order(isolated_loader_size));
716 }
717
718 static void
spufs_init_isolated_loader(void)719 spufs_init_isolated_loader(void)
720 {
721 struct device_node *dn;
722 const char *loader;
723 int size;
724
725 dn = of_find_node_by_path("/spu-isolation");
726 if (!dn)
727 return;
728
729 loader = of_get_property(dn, "loader", &size);
730 if (!loader)
731 return;
732
733 /* the loader must be align on a 16 byte boundary */
734 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
735 if (!isolated_loader)
736 return;
737
738 isolated_loader_size = size;
739 memcpy(isolated_loader, loader, size);
740 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
741 }
742
743 static int
spufs_create_root(struct super_block * sb,void * data)744 spufs_create_root(struct super_block *sb, void *data)
745 {
746 struct inode *inode;
747 int ret;
748
749 ret = -ENODEV;
750 if (!spu_management_ops)
751 goto out;
752
753 ret = -ENOMEM;
754 inode = spufs_new_inode(sb, S_IFDIR | 0775);
755 if (!inode)
756 goto out;
757
758 inode->i_op = &simple_dir_inode_operations;
759 inode->i_fop = &simple_dir_operations;
760 SPUFS_I(inode)->i_ctx = NULL;
761 inc_nlink(inode);
762
763 ret = -EINVAL;
764 if (!spufs_parse_options(sb, data, inode))
765 goto out_iput;
766
767 ret = -ENOMEM;
768 sb->s_root = d_alloc_root(inode);
769 if (!sb->s_root)
770 goto out_iput;
771
772 return 0;
773 out_iput:
774 iput(inode);
775 out:
776 return ret;
777 }
778
779 static int
spufs_fill_super(struct super_block * sb,void * data,int silent)780 spufs_fill_super(struct super_block *sb, void *data, int silent)
781 {
782 struct spufs_sb_info *info;
783 static const struct super_operations s_ops = {
784 .alloc_inode = spufs_alloc_inode,
785 .destroy_inode = spufs_destroy_inode,
786 .statfs = simple_statfs,
787 .evict_inode = spufs_evict_inode,
788 .show_options = generic_show_options,
789 };
790
791 save_mount_options(sb, data);
792
793 info = kzalloc(sizeof(*info), GFP_KERNEL);
794 if (!info)
795 return -ENOMEM;
796
797 sb->s_maxbytes = MAX_LFS_FILESIZE;
798 sb->s_blocksize = PAGE_CACHE_SIZE;
799 sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
800 sb->s_magic = SPUFS_MAGIC;
801 sb->s_op = &s_ops;
802 sb->s_fs_info = info;
803
804 return spufs_create_root(sb, data);
805 }
806
807 static struct dentry *
spufs_mount(struct file_system_type * fstype,int flags,const char * name,void * data)808 spufs_mount(struct file_system_type *fstype, int flags,
809 const char *name, void *data)
810 {
811 return mount_single(fstype, flags, data, spufs_fill_super);
812 }
813
814 static struct file_system_type spufs_type = {
815 .owner = THIS_MODULE,
816 .name = "spufs",
817 .mount = spufs_mount,
818 .kill_sb = kill_litter_super,
819 };
820
spufs_init(void)821 static int __init spufs_init(void)
822 {
823 int ret;
824
825 ret = -ENODEV;
826 if (!spu_management_ops)
827 goto out;
828
829 ret = -ENOMEM;
830 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
831 sizeof(struct spufs_inode_info), 0,
832 SLAB_HWCACHE_ALIGN, spufs_init_once);
833
834 if (!spufs_inode_cache)
835 goto out;
836 ret = spu_sched_init();
837 if (ret)
838 goto out_cache;
839 ret = register_filesystem(&spufs_type);
840 if (ret)
841 goto out_sched;
842 ret = register_spu_syscalls(&spufs_calls);
843 if (ret)
844 goto out_fs;
845
846 spufs_init_isolated_loader();
847
848 return 0;
849
850 out_fs:
851 unregister_filesystem(&spufs_type);
852 out_sched:
853 spu_sched_exit();
854 out_cache:
855 kmem_cache_destroy(spufs_inode_cache);
856 out:
857 return ret;
858 }
859 module_init(spufs_init);
860
spufs_exit(void)861 static void __exit spufs_exit(void)
862 {
863 spu_sched_exit();
864 spufs_exit_isolated_loader();
865 unregister_spu_syscalls(&spufs_calls);
866 unregister_filesystem(&spufs_type);
867 kmem_cache_destroy(spufs_inode_cache);
868 }
869 module_exit(spufs_exit);
870
871 MODULE_LICENSE("GPL");
872 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
873
874