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/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/of.h>
25#include <linux/seq_file.h>
26#include <linux/slab.h>
27
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(s: 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 simple_inode_init_ts(inode);
90out:
91 return inode;
92}
93
94static int
95spufs_setattr(struct mnt_idmap *idmap, 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(&nop_mnt_idmap, 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_make_persistent(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(ctx: ei->i_ctx);
142 if (ei->i_gang)
143 put_spu_gang(gang: ei->i_gang);
144}
145
146/* Caller must hold parent->i_mutex */
147static void spufs_rmdir(struct inode *parent, struct dentry *dir)
148{
149 struct spu_context *ctx = SPUFS_I(d_inode(dir))->i_ctx;
150
151 locked_recursive_removal(dir, NULL);
152 spu_forget(ctx);
153}
154
155static int spufs_fill_dir(struct dentry *dir,
156 const struct spufs_tree_descr *files, umode_t mode,
157 struct spu_context *ctx)
158{
159 while (files->name && files->name[0]) {
160 int ret;
161 struct dentry *dentry = d_alloc_name(dir, files->name);
162 if (!dentry)
163 return -ENOMEM;
164 ret = spufs_new_file(sb: dir->d_sb, dentry, fops: files->ops,
165 mode: files->mode & mode, size: files->size, ctx);
166 dput(dentry);
167 if (ret)
168 return ret;
169 files++;
170 }
171 return 0;
172}
173
174static void unuse_gang(struct dentry *dir)
175{
176 struct inode *inode = dir->d_inode;
177 struct spu_gang *gang = SPUFS_I(inode)->i_gang;
178
179 if (gang) {
180 bool dead;
181
182 inode_lock(inode); // exclusion with spufs_create_context()
183 dead = !--gang->alive;
184 inode_unlock(inode);
185
186 if (dead)
187 simple_recursive_removal(dir, NULL);
188 }
189}
190
191static int spufs_dir_close(struct inode *inode, struct file *file)
192{
193 struct inode *parent;
194 struct dentry *dir;
195
196 dir = file->f_path.dentry;
197 parent = d_inode(dentry: dir->d_parent);
198
199 inode_lock_nested(inode: parent, subclass: I_MUTEX_PARENT);
200 spufs_rmdir(parent, dir);
201 inode_unlock(inode: parent);
202
203 unuse_gang(dir: dir->d_parent);
204 return dcache_dir_close(inode, file);
205}
206
207const struct file_operations spufs_context_fops = {
208 .open = dcache_dir_open,
209 .release = spufs_dir_close,
210 .llseek = dcache_dir_lseek,
211 .read = generic_read_dir,
212 .iterate_shared = dcache_readdir,
213 .fsync = noop_fsync,
214};
215EXPORT_SYMBOL_GPL(spufs_context_fops);
216
217static int
218spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
219 umode_t mode)
220{
221 int ret;
222 struct inode *inode;
223 struct spu_context *ctx;
224
225 inode = spufs_new_inode(sb: dir->i_sb, mode: mode | S_IFDIR);
226 if (!inode)
227 return -ENOSPC;
228
229 inode_init_owner(idmap: &nop_mnt_idmap, inode, dir, mode: mode | S_IFDIR);
230 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
231 SPUFS_I(inode)->i_ctx = ctx;
232 if (!ctx) {
233 iput(inode);
234 return -ENOSPC;
235 }
236
237 ctx->flags = flags;
238 inode->i_op = &simple_dir_inode_operations;
239 inode->i_fop = &simple_dir_operations;
240
241 inode_lock(inode);
242
243 inc_nlink(inode: dir);
244 inc_nlink(inode);
245
246 d_make_persistent(dentry, inode);
247
248 if (flags & SPU_CREATE_NOSCHED)
249 ret = spufs_fill_dir(dir: dentry, files: spufs_dir_nosched_contents,
250 mode, ctx);
251 else
252 ret = spufs_fill_dir(dir: dentry, files: spufs_dir_contents, mode, ctx);
253
254 if (!ret && spufs_get_sb_info(sb: dir->i_sb)->debug)
255 ret = spufs_fill_dir(dir: dentry, files: spufs_dir_debug_contents,
256 mode, ctx);
257
258 inode_unlock(inode);
259
260 if (ret)
261 spufs_rmdir(parent: dir, dir: dentry);
262
263 return ret;
264}
265
266static int spufs_context_open(const struct path *path)
267{
268 FD_PREPARE(fdf, 0, dentry_open(path, O_RDONLY, current_cred()));
269 if (fdf.err)
270 return fdf.err;
271 fd_prepare_file(fdf)->f_op = &spufs_context_fops;
272 return fd_publish(fdf);
273}
274
275static struct spu_context *
276spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
277 struct file *filp)
278{
279 struct spu_context *tmp, *neighbor, *err;
280 int count, node;
281 int aff_supp;
282
283 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
284 struct spu, cbe_list))->aff_list);
285
286 if (!aff_supp)
287 return ERR_PTR(error: -EINVAL);
288
289 if (flags & SPU_CREATE_GANG)
290 return ERR_PTR(error: -EINVAL);
291
292 if (flags & SPU_CREATE_AFFINITY_MEM &&
293 gang->aff_ref_ctx &&
294 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
295 return ERR_PTR(error: -EEXIST);
296
297 if (gang->aff_flags & AFF_MERGED)
298 return ERR_PTR(error: -EBUSY);
299
300 neighbor = NULL;
301 if (flags & SPU_CREATE_AFFINITY_SPU) {
302 if (!filp || filp->f_op != &spufs_context_fops)
303 return ERR_PTR(error: -EINVAL);
304
305 neighbor = get_spu_context(
306 SPUFS_I(file_inode(filp))->i_ctx);
307
308 if (!list_empty(head: &neighbor->aff_list) && !(neighbor->aff_head) &&
309 !list_is_last(list: &neighbor->aff_list, head: &gang->aff_list_head) &&
310 !list_entry(neighbor->aff_list.next, struct spu_context,
311 aff_list)->aff_head) {
312 err = ERR_PTR(error: -EEXIST);
313 goto out_put_neighbor;
314 }
315
316 if (gang != neighbor->gang) {
317 err = ERR_PTR(error: -EINVAL);
318 goto out_put_neighbor;
319 }
320
321 count = 1;
322 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
323 count++;
324 if (list_empty(head: &neighbor->aff_list))
325 count++;
326
327 for (node = 0; node < MAX_NUMNODES; node++) {
328 if ((cbe_spu_info[node].n_spus - atomic_read(
329 &cbe_spu_info[node].reserved_spus)) >= count)
330 break;
331 }
332
333 if (node == MAX_NUMNODES) {
334 err = ERR_PTR(error: -EEXIST);
335 goto out_put_neighbor;
336 }
337 }
338
339 return neighbor;
340
341out_put_neighbor:
342 put_spu_context(ctx: neighbor);
343 return err;
344}
345
346static void
347spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
348 struct spu_context *neighbor)
349{
350 if (flags & SPU_CREATE_AFFINITY_MEM)
351 ctx->gang->aff_ref_ctx = ctx;
352
353 if (flags & SPU_CREATE_AFFINITY_SPU) {
354 if (list_empty(head: &neighbor->aff_list)) {
355 list_add_tail(new: &neighbor->aff_list,
356 head: &ctx->gang->aff_list_head);
357 neighbor->aff_head = 1;
358 }
359
360 if (list_is_last(list: &neighbor->aff_list, head: &ctx->gang->aff_list_head)
361 || list_entry(neighbor->aff_list.next, struct spu_context,
362 aff_list)->aff_head) {
363 list_add(new: &ctx->aff_list, head: &neighbor->aff_list);
364 } else {
365 list_add_tail(new: &ctx->aff_list, head: &neighbor->aff_list);
366 if (neighbor->aff_head) {
367 neighbor->aff_head = 0;
368 ctx->aff_head = 1;
369 }
370 }
371
372 if (!ctx->gang->aff_ref_ctx)
373 ctx->gang->aff_ref_ctx = ctx;
374 }
375}
376
377static int
378spufs_create_context(struct inode *inode, struct dentry *dentry,
379 struct vfsmount *mnt, int flags, umode_t mode,
380 struct file *aff_filp)
381{
382 int ret;
383 int affinity;
384 struct spu_gang *gang = SPUFS_I(inode)->i_gang;
385 struct spu_context *neighbor;
386 struct path path = {.mnt = mnt, .dentry = dentry};
387
388 if ((flags & SPU_CREATE_NOSCHED) &&
389 !capable(CAP_SYS_NICE))
390 return -EPERM;
391
392 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
393 == SPU_CREATE_ISOLATE)
394 return -EINVAL;
395
396 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
397 return -ENODEV;
398
399 if (gang) {
400 if (!gang->alive)
401 return -ENOENT;
402 gang->alive++;
403 }
404
405 neighbor = NULL;
406 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
407 if (affinity) {
408 if (!gang)
409 return -EINVAL;
410 mutex_lock(&gang->aff_mutex);
411 neighbor = spufs_assert_affinity(flags, gang, filp: aff_filp);
412 if (IS_ERR(ptr: neighbor)) {
413 ret = PTR_ERR(ptr: neighbor);
414 goto out_aff_unlock;
415 }
416 }
417
418 ret = spufs_mkdir(dir: inode, dentry, flags, mode: mode & 0777);
419 if (ret) {
420 if (neighbor)
421 put_spu_context(ctx: neighbor);
422 goto out_aff_unlock;
423 }
424
425 if (affinity) {
426 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
427 neighbor);
428 if (neighbor)
429 put_spu_context(ctx: neighbor);
430 }
431
432 ret = spufs_context_open(path: &path);
433 if (ret < 0)
434 spufs_rmdir(parent: inode, dir: dentry);
435
436out_aff_unlock:
437 if (affinity)
438 mutex_unlock(lock: &gang->aff_mutex);
439 if (ret && gang)
440 gang->alive--; // can't reach 0
441 return ret;
442}
443
444static int
445spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
446{
447 int ret;
448 struct inode *inode;
449 struct spu_gang *gang;
450
451 ret = -ENOSPC;
452 inode = spufs_new_inode(sb: dir->i_sb, mode: mode | S_IFDIR);
453 if (!inode)
454 goto out;
455
456 ret = 0;
457 inode_init_owner(idmap: &nop_mnt_idmap, inode, dir, mode: mode | S_IFDIR);
458 gang = alloc_spu_gang();
459 SPUFS_I(inode)->i_ctx = NULL;
460 SPUFS_I(inode)->i_gang = gang;
461 if (!gang) {
462 ret = -ENOMEM;
463 goto out_iput;
464 }
465
466 inode->i_op = &simple_dir_inode_operations;
467 inode->i_fop = &simple_dir_operations;
468
469 inc_nlink(inode: dir);
470 inc_nlink(inode);
471 d_make_persistent(dentry, inode);
472 return ret;
473
474out_iput:
475 iput(inode);
476out:
477 return ret;
478}
479
480static int spufs_gang_close(struct inode *inode, struct file *file)
481{
482 unuse_gang(dir: file->f_path.dentry);
483 return dcache_dir_close(inode, file);
484}
485
486static const struct file_operations spufs_gang_fops = {
487 .open = dcache_dir_open,
488 .release = spufs_gang_close,
489 .llseek = dcache_dir_lseek,
490 .read = generic_read_dir,
491 .iterate_shared = dcache_readdir,
492 .fsync = noop_fsync,
493};
494
495static int spufs_gang_open(const struct path *path)
496{
497 /*
498 * get references for dget and mntget, will be released
499 * in error path of *_open().
500 */
501 FD_PREPARE(fdf, 0, dentry_open(path, O_RDONLY, current_cred()));
502 if (fdf.err)
503 return fdf.err;
504 fd_prepare_file(fdf)->f_op = &spufs_gang_fops;
505 return fd_publish(fdf);
506}
507
508static int spufs_create_gang(struct inode *inode,
509 struct dentry *dentry,
510 struct vfsmount *mnt, umode_t mode)
511{
512 struct path path = {.mnt = mnt, .dentry = dentry};
513 int ret;
514
515 ret = spufs_mkgang(dir: inode, dentry, mode: mode & 0777);
516 if (!ret) {
517 ret = spufs_gang_open(path: &path);
518 if (ret < 0)
519 unuse_gang(dir: dentry);
520 }
521 return ret;
522}
523
524
525static struct file_system_type spufs_type;
526
527long spufs_create(const struct path *path, struct dentry *dentry,
528 unsigned int flags, umode_t mode, struct file *filp)
529{
530 struct inode *dir = d_inode(dentry: path->dentry);
531 int ret;
532
533 /* check if we are on spufs */
534 if (path->dentry->d_sb->s_type != &spufs_type)
535 return -EINVAL;
536
537 /* don't accept undefined flags */
538 if (flags & (~SPU_CREATE_FLAG_ALL))
539 return -EINVAL;
540
541 /* only threads can be underneath a gang */
542 if (path->dentry != path->dentry->d_sb->s_root)
543 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
544 return -EINVAL;
545
546 mode &= ~current_umask();
547
548 if (flags & SPU_CREATE_GANG)
549 ret = spufs_create_gang(inode: dir, dentry, mnt: path->mnt, mode);
550 else
551 ret = spufs_create_context(inode: dir, dentry, mnt: path->mnt, flags, mode,
552 aff_filp: filp);
553 if (ret >= 0)
554 fsnotify_mkdir(dir, dentry);
555
556 return ret;
557}
558
559/* File system initialization */
560struct spufs_fs_context {
561 kuid_t uid;
562 kgid_t gid;
563 umode_t mode;
564};
565
566enum {
567 Opt_uid, Opt_gid, Opt_mode, Opt_debug,
568};
569
570static const struct fs_parameter_spec spufs_fs_parameters[] = {
571 fsparam_u32 ("gid", Opt_gid),
572 fsparam_u32oct ("mode", Opt_mode),
573 fsparam_u32 ("uid", Opt_uid),
574 fsparam_flag ("debug", Opt_debug),
575 {}
576};
577
578static int spufs_show_options(struct seq_file *m, struct dentry *root)
579{
580 struct spufs_sb_info *sbi = spufs_get_sb_info(sb: root->d_sb);
581 struct inode *inode = root->d_inode;
582
583 if (!uid_eq(left: inode->i_uid, GLOBAL_ROOT_UID))
584 seq_printf(m, ",uid=%u",
585 from_kuid_munged(&init_user_ns, inode->i_uid));
586 if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
587 seq_printf(m, ",gid=%u",
588 from_kgid_munged(&init_user_ns, inode->i_gid));
589 if ((inode->i_mode & S_IALLUGO) != 0775)
590 seq_printf(m, ",mode=%o", inode->i_mode);
591 if (sbi->debug)
592 seq_puts(m, ",debug");
593 return 0;
594}
595
596static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
597{
598 struct spufs_fs_context *ctx = fc->fs_private;
599 struct spufs_sb_info *sbi = fc->s_fs_info;
600 struct fs_parse_result result;
601 kuid_t uid;
602 kgid_t gid;
603 int opt;
604
605 opt = fs_parse(fc, desc: spufs_fs_parameters, param, result: &result);
606 if (opt < 0)
607 return opt;
608
609 switch (opt) {
610 case Opt_uid:
611 uid = make_kuid(current_user_ns(), uid: result.uint_32);
612 if (!uid_valid(uid))
613 return invalf(fc, "Unknown uid");
614 ctx->uid = uid;
615 break;
616 case Opt_gid:
617 gid = make_kgid(current_user_ns(), gid: result.uint_32);
618 if (!gid_valid(gid))
619 return invalf(fc, "Unknown gid");
620 ctx->gid = gid;
621 break;
622 case Opt_mode:
623 ctx->mode = result.uint_32 & S_IALLUGO;
624 break;
625 case Opt_debug:
626 sbi->debug = true;
627 break;
628 }
629
630 return 0;
631}
632
633static void spufs_exit_isolated_loader(void)
634{
635 free_pages(addr: (unsigned long) isolated_loader,
636 order: get_order(size: isolated_loader_size));
637}
638
639static void __init
640spufs_init_isolated_loader(void)
641{
642 struct device_node *dn;
643 const char *loader;
644 int size;
645
646 dn = of_find_node_by_path(path: "/spu-isolation");
647 if (!dn)
648 return;
649
650 loader = of_get_property(node: dn, name: "loader", lenp: &size);
651 of_node_put(node: dn);
652 if (!loader)
653 return;
654
655 /* the loader must be align on a 16 byte boundary */
656 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
657 if (!isolated_loader)
658 return;
659
660 isolated_loader_size = size;
661 memcpy(isolated_loader, loader, size);
662 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
663}
664
665static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
666{
667 struct spufs_fs_context *ctx = fc->fs_private;
668 struct inode *inode;
669
670 if (!spu_management_ops)
671 return -ENODEV;
672
673 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
674 if (!inode)
675 return -ENOMEM;
676
677 inode->i_uid = ctx->uid;
678 inode->i_gid = ctx->gid;
679 inode->i_op = &simple_dir_inode_operations;
680 inode->i_fop = &simple_dir_operations;
681 SPUFS_I(inode)->i_ctx = NULL;
682 inc_nlink(inode);
683
684 sb->s_root = d_make_root(inode);
685 if (!sb->s_root)
686 return -ENOMEM;
687 return 0;
688}
689
690static const struct super_operations spufs_ops = {
691 .alloc_inode = spufs_alloc_inode,
692 .free_inode = spufs_free_inode,
693 .statfs = simple_statfs,
694 .evict_inode = spufs_evict_inode,
695 .show_options = spufs_show_options,
696};
697
698static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
699{
700 sb->s_maxbytes = MAX_LFS_FILESIZE;
701 sb->s_blocksize = PAGE_SIZE;
702 sb->s_blocksize_bits = PAGE_SHIFT;
703 sb->s_magic = SPUFS_MAGIC;
704 sb->s_op = &spufs_ops;
705
706 return spufs_create_root(sb, fc);
707}
708
709static int spufs_get_tree(struct fs_context *fc)
710{
711 return get_tree_single(fc, fill_super: spufs_fill_super);
712}
713
714static void spufs_free_fc(struct fs_context *fc)
715{
716 kfree(objp: fc->s_fs_info);
717}
718
719static const struct fs_context_operations spufs_context_ops = {
720 .free = spufs_free_fc,
721 .parse_param = spufs_parse_param,
722 .get_tree = spufs_get_tree,
723};
724
725static int spufs_init_fs_context(struct fs_context *fc)
726{
727 struct spufs_fs_context *ctx;
728 struct spufs_sb_info *sbi;
729
730 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
731 if (!ctx)
732 goto nomem;
733
734 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
735 if (!sbi)
736 goto nomem_ctx;
737
738 ctx->uid = current_uid();
739 ctx->gid = current_gid();
740 ctx->mode = 0755;
741
742 fc->fs_private = ctx;
743 fc->s_fs_info = sbi;
744 fc->ops = &spufs_context_ops;
745 return 0;
746
747nomem_ctx:
748 kfree(objp: ctx);
749nomem:
750 return -ENOMEM;
751}
752
753static struct file_system_type spufs_type = {
754 .owner = THIS_MODULE,
755 .name = "spufs",
756 .init_fs_context = spufs_init_fs_context,
757 .parameters = spufs_fs_parameters,
758 .kill_sb = kill_anon_super,
759};
760MODULE_ALIAS_FS("spufs");
761
762static int __init spufs_init(void)
763{
764 int ret;
765
766 ret = -ENODEV;
767 if (!spu_management_ops)
768 goto out;
769
770 ret = -ENOMEM;
771 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
772 sizeof(struct spufs_inode_info), 0,
773 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
774
775 if (!spufs_inode_cache)
776 goto out;
777 ret = spu_sched_init();
778 if (ret)
779 goto out_cache;
780 ret = register_spu_syscalls(&spufs_calls);
781 if (ret)
782 goto out_sched;
783 ret = register_filesystem(&spufs_type);
784 if (ret)
785 goto out_syscalls;
786
787 spufs_init_isolated_loader();
788
789 return 0;
790
791out_syscalls:
792 unregister_spu_syscalls(&spufs_calls);
793out_sched:
794 spu_sched_exit();
795out_cache:
796 kmem_cache_destroy(s: spufs_inode_cache);
797out:
798 return ret;
799}
800module_init(spufs_init);
801
802static void __exit spufs_exit(void)
803{
804 spu_sched_exit();
805 spufs_exit_isolated_loader();
806 unregister_spu_syscalls(&spufs_calls);
807 unregister_filesystem(&spufs_type);
808 kmem_cache_destroy(s: spufs_inode_cache);
809}
810module_exit(spufs_exit);
811
812MODULE_DESCRIPTION("SPU file system");
813MODULE_LICENSE("GPL");
814MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
815
816

source code of linux/arch/powerpc/platforms/cell/spufs/inode.c