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
34 struct spufs_sb_info {
35 bool debug;
36 };
37
38 static struct kmem_cache *spufs_inode_cache;
39 char *isolated_loader;
40 static int isolated_loader_size;
41
spufs_get_sb_info(struct super_block * sb)42 static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
43 {
44 return sb->s_fs_info;
45 }
46
47 static struct inode *
spufs_alloc_inode(struct super_block * sb)48 spufs_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
spufs_free_inode(struct inode * inode)63 static void spufs_free_inode(struct inode *inode)
64 {
65 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
66 }
67
68 static void
spufs_init_once(void * p)69 spufs_init_once(void *p)
70 {
71 struct spufs_inode_info *ei = p;
72
73 inode_init_once(&ei->vfs_inode);
74 }
75
76 static struct inode *
spufs_new_inode(struct super_block * sb,umode_t mode)77 spufs_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);
90 out:
91 return inode;
92 }
93
94 static int
spufs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)95 spufs_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
109 static int
spufs_new_file(struct super_block * sb,struct dentry * dentry,const struct file_operations * fops,umode_t mode,size_t size,struct spu_context * ctx)110 spufs_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);
131 out:
132 return ret;
133 }
134
135 static void
spufs_evict_inode(struct inode * inode)136 spufs_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
146 /* Caller must hold parent->i_mutex */
spufs_rmdir(struct inode * parent,struct dentry * dir)147 static 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
spufs_fill_dir(struct dentry * dir,const struct spufs_tree_descr * files,umode_t mode,struct spu_context * ctx)155 static 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(dir->d_sb, dentry, files->ops,
165 files->mode & mode, files->size, ctx);
166 if (ret) {
167 dput(dentry);
168 return ret;
169 }
170 files++;
171 }
172 return 0;
173 }
174
unuse_gang(struct dentry * dir)175 static void unuse_gang(struct dentry *dir)
176 {
177 struct inode *inode = dir->d_inode;
178 struct spu_gang *gang = SPUFS_I(inode)->i_gang;
179
180 if (gang) {
181 bool dead;
182
183 inode_lock(inode); // exclusion with spufs_create_context()
184 dead = !--gang->alive;
185 inode_unlock(inode);
186
187 if (dead)
188 simple_recursive_removal(dir, NULL);
189 }
190 }
191
spufs_dir_close(struct inode * inode,struct file * file)192 static int spufs_dir_close(struct inode *inode, struct file *file)
193 {
194 struct inode *parent;
195 struct dentry *dir;
196
197 dir = file->f_path.dentry;
198 parent = d_inode(dir->d_parent);
199
200 inode_lock_nested(parent, I_MUTEX_PARENT);
201 spufs_rmdir(parent, dir);
202 inode_unlock(parent);
203
204 unuse_gang(dir->d_parent);
205 return dcache_dir_close(inode, file);
206 }
207
208 const struct file_operations spufs_context_fops = {
209 .open = dcache_dir_open,
210 .release = spufs_dir_close,
211 .llseek = dcache_dir_lseek,
212 .read = generic_read_dir,
213 .iterate_shared = dcache_readdir,
214 .fsync = noop_fsync,
215 };
216 EXPORT_SYMBOL_GPL(spufs_context_fops);
217
218 static int
spufs_mkdir(struct inode * dir,struct dentry * dentry,unsigned int flags,umode_t mode)219 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
220 umode_t mode)
221 {
222 int ret;
223 struct inode *inode;
224 struct spu_context *ctx;
225
226 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
227 if (!inode)
228 return -ENOSPC;
229
230 inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR);
231 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
232 SPUFS_I(inode)->i_ctx = ctx;
233 if (!ctx) {
234 iput(inode);
235 return -ENOSPC;
236 }
237
238 ctx->flags = flags;
239 inode->i_op = &simple_dir_inode_operations;
240 inode->i_fop = &simple_dir_operations;
241
242 inode_lock(inode);
243
244 dget(dentry);
245 inc_nlink(dir);
246 inc_nlink(inode);
247
248 d_instantiate(dentry, inode);
249
250 if (flags & SPU_CREATE_NOSCHED)
251 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
252 mode, ctx);
253 else
254 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
255
256 if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
257 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
258 mode, ctx);
259
260 inode_unlock(inode);
261
262 if (ret)
263 spufs_rmdir(dir, dentry);
264
265 return ret;
266 }
267
spufs_context_open(const struct path * path)268 static int spufs_context_open(const struct path *path)
269 {
270 int ret;
271 struct file *filp;
272
273 ret = get_unused_fd_flags(0);
274 if (ret < 0)
275 return ret;
276
277 filp = dentry_open(path, O_RDONLY, current_cred());
278 if (IS_ERR(filp)) {
279 put_unused_fd(ret);
280 return PTR_ERR(filp);
281 }
282
283 filp->f_op = &spufs_context_fops;
284 fd_install(ret, filp);
285 return ret;
286 }
287
288 static struct spu_context *
spufs_assert_affinity(unsigned int flags,struct spu_gang * gang,struct file * filp)289 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
290 struct file *filp)
291 {
292 struct spu_context *tmp, *neighbor, *err;
293 int count, node;
294 int aff_supp;
295
296 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
297 struct spu, cbe_list))->aff_list);
298
299 if (!aff_supp)
300 return ERR_PTR(-EINVAL);
301
302 if (flags & SPU_CREATE_GANG)
303 return ERR_PTR(-EINVAL);
304
305 if (flags & SPU_CREATE_AFFINITY_MEM &&
306 gang->aff_ref_ctx &&
307 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
308 return ERR_PTR(-EEXIST);
309
310 if (gang->aff_flags & AFF_MERGED)
311 return ERR_PTR(-EBUSY);
312
313 neighbor = NULL;
314 if (flags & SPU_CREATE_AFFINITY_SPU) {
315 if (!filp || filp->f_op != &spufs_context_fops)
316 return ERR_PTR(-EINVAL);
317
318 neighbor = get_spu_context(
319 SPUFS_I(file_inode(filp))->i_ctx);
320
321 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
322 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
323 !list_entry(neighbor->aff_list.next, struct spu_context,
324 aff_list)->aff_head) {
325 err = ERR_PTR(-EEXIST);
326 goto out_put_neighbor;
327 }
328
329 if (gang != neighbor->gang) {
330 err = ERR_PTR(-EINVAL);
331 goto out_put_neighbor;
332 }
333
334 count = 1;
335 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
336 count++;
337 if (list_empty(&neighbor->aff_list))
338 count++;
339
340 for (node = 0; node < MAX_NUMNODES; node++) {
341 if ((cbe_spu_info[node].n_spus - atomic_read(
342 &cbe_spu_info[node].reserved_spus)) >= count)
343 break;
344 }
345
346 if (node == MAX_NUMNODES) {
347 err = ERR_PTR(-EEXIST);
348 goto out_put_neighbor;
349 }
350 }
351
352 return neighbor;
353
354 out_put_neighbor:
355 put_spu_context(neighbor);
356 return err;
357 }
358
359 static void
spufs_set_affinity(unsigned int flags,struct spu_context * ctx,struct spu_context * neighbor)360 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
361 struct spu_context *neighbor)
362 {
363 if (flags & SPU_CREATE_AFFINITY_MEM)
364 ctx->gang->aff_ref_ctx = ctx;
365
366 if (flags & SPU_CREATE_AFFINITY_SPU) {
367 if (list_empty(&neighbor->aff_list)) {
368 list_add_tail(&neighbor->aff_list,
369 &ctx->gang->aff_list_head);
370 neighbor->aff_head = 1;
371 }
372
373 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
374 || list_entry(neighbor->aff_list.next, struct spu_context,
375 aff_list)->aff_head) {
376 list_add(&ctx->aff_list, &neighbor->aff_list);
377 } else {
378 list_add_tail(&ctx->aff_list, &neighbor->aff_list);
379 if (neighbor->aff_head) {
380 neighbor->aff_head = 0;
381 ctx->aff_head = 1;
382 }
383 }
384
385 if (!ctx->gang->aff_ref_ctx)
386 ctx->gang->aff_ref_ctx = ctx;
387 }
388 }
389
390 static int
spufs_create_context(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,int flags,umode_t mode,struct file * aff_filp)391 spufs_create_context(struct inode *inode, struct dentry *dentry,
392 struct vfsmount *mnt, int flags, umode_t mode,
393 struct file *aff_filp)
394 {
395 int ret;
396 int affinity;
397 struct spu_gang *gang = SPUFS_I(inode)->i_gang;
398 struct spu_context *neighbor;
399 struct path path = {.mnt = mnt, .dentry = dentry};
400
401 if ((flags & SPU_CREATE_NOSCHED) &&
402 !capable(CAP_SYS_NICE))
403 return -EPERM;
404
405 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
406 == SPU_CREATE_ISOLATE)
407 return -EINVAL;
408
409 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
410 return -ENODEV;
411
412 if (gang) {
413 if (!gang->alive)
414 return -ENOENT;
415 gang->alive++;
416 }
417
418 neighbor = NULL;
419 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
420 if (affinity) {
421 if (!gang)
422 return -EINVAL;
423 mutex_lock(&gang->aff_mutex);
424 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
425 if (IS_ERR(neighbor)) {
426 ret = PTR_ERR(neighbor);
427 goto out_aff_unlock;
428 }
429 }
430
431 ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
432 if (ret) {
433 if (neighbor)
434 put_spu_context(neighbor);
435 goto out_aff_unlock;
436 }
437
438 if (affinity) {
439 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
440 neighbor);
441 if (neighbor)
442 put_spu_context(neighbor);
443 }
444
445 ret = spufs_context_open(&path);
446 if (ret < 0)
447 spufs_rmdir(inode, dentry);
448
449 out_aff_unlock:
450 if (affinity)
451 mutex_unlock(&gang->aff_mutex);
452 if (ret && gang)
453 gang->alive--; // can't reach 0
454 return ret;
455 }
456
457 static int
spufs_mkgang(struct inode * dir,struct dentry * dentry,umode_t mode)458 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
459 {
460 int ret;
461 struct inode *inode;
462 struct spu_gang *gang;
463
464 ret = -ENOSPC;
465 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
466 if (!inode)
467 goto out;
468
469 ret = 0;
470 inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR);
471 gang = alloc_spu_gang();
472 SPUFS_I(inode)->i_ctx = NULL;
473 SPUFS_I(inode)->i_gang = gang;
474 if (!gang) {
475 ret = -ENOMEM;
476 goto out_iput;
477 }
478
479 inode->i_op = &simple_dir_inode_operations;
480 inode->i_fop = &simple_dir_operations;
481
482 d_instantiate(dentry, inode);
483 dget(dentry);
484 inc_nlink(dir);
485 inc_nlink(d_inode(dentry));
486 return ret;
487
488 out_iput:
489 iput(inode);
490 out:
491 return ret;
492 }
493
spufs_gang_close(struct inode * inode,struct file * file)494 static int spufs_gang_close(struct inode *inode, struct file *file)
495 {
496 unuse_gang(file->f_path.dentry);
497 return dcache_dir_close(inode, file);
498 }
499
500 static const struct file_operations spufs_gang_fops = {
501 .open = dcache_dir_open,
502 .release = spufs_gang_close,
503 .llseek = dcache_dir_lseek,
504 .read = generic_read_dir,
505 .iterate_shared = dcache_readdir,
506 .fsync = noop_fsync,
507 };
508
spufs_gang_open(const struct path * path)509 static int spufs_gang_open(const struct path *path)
510 {
511 int ret;
512 struct file *filp;
513
514 ret = get_unused_fd_flags(0);
515 if (ret < 0)
516 return ret;
517
518 /*
519 * get references for dget and mntget, will be released
520 * in error path of *_open().
521 */
522 filp = dentry_open(path, O_RDONLY, current_cred());
523 if (IS_ERR(filp)) {
524 put_unused_fd(ret);
525 return PTR_ERR(filp);
526 }
527
528 filp->f_op = &spufs_gang_fops;
529 fd_install(ret, filp);
530 return ret;
531 }
532
spufs_create_gang(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,umode_t mode)533 static int spufs_create_gang(struct inode *inode,
534 struct dentry *dentry,
535 struct vfsmount *mnt, umode_t mode)
536 {
537 struct path path = {.mnt = mnt, .dentry = dentry};
538 int ret;
539
540 ret = spufs_mkgang(inode, dentry, mode & 0777);
541 if (!ret) {
542 ret = spufs_gang_open(&path);
543 if (ret < 0)
544 unuse_gang(dentry);
545 }
546 return ret;
547 }
548
549
550 static struct file_system_type spufs_type;
551
spufs_create(const struct path * path,struct dentry * dentry,unsigned int flags,umode_t mode,struct file * filp)552 long spufs_create(const struct path *path, struct dentry *dentry,
553 unsigned int flags, umode_t mode, struct file *filp)
554 {
555 struct inode *dir = d_inode(path->dentry);
556 int ret;
557
558 /* check if we are on spufs */
559 if (path->dentry->d_sb->s_type != &spufs_type)
560 return -EINVAL;
561
562 /* don't accept undefined flags */
563 if (flags & (~SPU_CREATE_FLAG_ALL))
564 return -EINVAL;
565
566 /* only threads can be underneath a gang */
567 if (path->dentry != path->dentry->d_sb->s_root)
568 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
569 return -EINVAL;
570
571 mode &= ~current_umask();
572
573 if (flags & SPU_CREATE_GANG)
574 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
575 else
576 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
577 filp);
578 if (ret >= 0)
579 fsnotify_mkdir(dir, dentry);
580
581 return ret;
582 }
583
584 /* File system initialization */
585 struct spufs_fs_context {
586 kuid_t uid;
587 kgid_t gid;
588 umode_t mode;
589 };
590
591 enum {
592 Opt_uid, Opt_gid, Opt_mode, Opt_debug,
593 };
594
595 static const struct fs_parameter_spec spufs_fs_parameters[] = {
596 fsparam_u32 ("gid", Opt_gid),
597 fsparam_u32oct ("mode", Opt_mode),
598 fsparam_u32 ("uid", Opt_uid),
599 fsparam_flag ("debug", Opt_debug),
600 {}
601 };
602
spufs_show_options(struct seq_file * m,struct dentry * root)603 static int spufs_show_options(struct seq_file *m, struct dentry *root)
604 {
605 struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
606 struct inode *inode = root->d_inode;
607
608 if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
609 seq_printf(m, ",uid=%u",
610 from_kuid_munged(&init_user_ns, inode->i_uid));
611 if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
612 seq_printf(m, ",gid=%u",
613 from_kgid_munged(&init_user_ns, inode->i_gid));
614 if ((inode->i_mode & S_IALLUGO) != 0775)
615 seq_printf(m, ",mode=%o", inode->i_mode);
616 if (sbi->debug)
617 seq_puts(m, ",debug");
618 return 0;
619 }
620
spufs_parse_param(struct fs_context * fc,struct fs_parameter * param)621 static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
622 {
623 struct spufs_fs_context *ctx = fc->fs_private;
624 struct spufs_sb_info *sbi = fc->s_fs_info;
625 struct fs_parse_result result;
626 kuid_t uid;
627 kgid_t gid;
628 int opt;
629
630 opt = fs_parse(fc, spufs_fs_parameters, param, &result);
631 if (opt < 0)
632 return opt;
633
634 switch (opt) {
635 case Opt_uid:
636 uid = make_kuid(current_user_ns(), result.uint_32);
637 if (!uid_valid(uid))
638 return invalf(fc, "Unknown uid");
639 ctx->uid = uid;
640 break;
641 case Opt_gid:
642 gid = make_kgid(current_user_ns(), result.uint_32);
643 if (!gid_valid(gid))
644 return invalf(fc, "Unknown gid");
645 ctx->gid = gid;
646 break;
647 case Opt_mode:
648 ctx->mode = result.uint_32 & S_IALLUGO;
649 break;
650 case Opt_debug:
651 sbi->debug = true;
652 break;
653 }
654
655 return 0;
656 }
657
spufs_exit_isolated_loader(void)658 static void spufs_exit_isolated_loader(void)
659 {
660 free_pages((unsigned long) isolated_loader,
661 get_order(isolated_loader_size));
662 }
663
664 static void __init
spufs_init_isolated_loader(void)665 spufs_init_isolated_loader(void)
666 {
667 struct device_node *dn;
668 const char *loader;
669 int size;
670
671 dn = of_find_node_by_path("/spu-isolation");
672 if (!dn)
673 return;
674
675 loader = of_get_property(dn, "loader", &size);
676 of_node_put(dn);
677 if (!loader)
678 return;
679
680 /* the loader must be align on a 16 byte boundary */
681 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
682 if (!isolated_loader)
683 return;
684
685 isolated_loader_size = size;
686 memcpy(isolated_loader, loader, size);
687 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
688 }
689
spufs_create_root(struct super_block * sb,struct fs_context * fc)690 static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
691 {
692 struct spufs_fs_context *ctx = fc->fs_private;
693 struct inode *inode;
694
695 if (!spu_management_ops)
696 return -ENODEV;
697
698 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
699 if (!inode)
700 return -ENOMEM;
701
702 inode->i_uid = ctx->uid;
703 inode->i_gid = ctx->gid;
704 inode->i_op = &simple_dir_inode_operations;
705 inode->i_fop = &simple_dir_operations;
706 SPUFS_I(inode)->i_ctx = NULL;
707 inc_nlink(inode);
708
709 sb->s_root = d_make_root(inode);
710 if (!sb->s_root)
711 return -ENOMEM;
712 return 0;
713 }
714
715 static const struct super_operations spufs_ops = {
716 .alloc_inode = spufs_alloc_inode,
717 .free_inode = spufs_free_inode,
718 .statfs = simple_statfs,
719 .evict_inode = spufs_evict_inode,
720 .show_options = spufs_show_options,
721 };
722
spufs_fill_super(struct super_block * sb,struct fs_context * fc)723 static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
724 {
725 sb->s_maxbytes = MAX_LFS_FILESIZE;
726 sb->s_blocksize = PAGE_SIZE;
727 sb->s_blocksize_bits = PAGE_SHIFT;
728 sb->s_magic = SPUFS_MAGIC;
729 sb->s_op = &spufs_ops;
730
731 return spufs_create_root(sb, fc);
732 }
733
spufs_get_tree(struct fs_context * fc)734 static int spufs_get_tree(struct fs_context *fc)
735 {
736 return get_tree_single(fc, spufs_fill_super);
737 }
738
spufs_free_fc(struct fs_context * fc)739 static void spufs_free_fc(struct fs_context *fc)
740 {
741 kfree(fc->s_fs_info);
742 }
743
744 static const struct fs_context_operations spufs_context_ops = {
745 .free = spufs_free_fc,
746 .parse_param = spufs_parse_param,
747 .get_tree = spufs_get_tree,
748 };
749
spufs_init_fs_context(struct fs_context * fc)750 static int spufs_init_fs_context(struct fs_context *fc)
751 {
752 struct spufs_fs_context *ctx;
753 struct spufs_sb_info *sbi;
754
755 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
756 if (!ctx)
757 goto nomem;
758
759 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
760 if (!sbi)
761 goto nomem_ctx;
762
763 ctx->uid = current_uid();
764 ctx->gid = current_gid();
765 ctx->mode = 0755;
766
767 fc->fs_private = ctx;
768 fc->s_fs_info = sbi;
769 fc->ops = &spufs_context_ops;
770 return 0;
771
772 nomem_ctx:
773 kfree(ctx);
774 nomem:
775 return -ENOMEM;
776 }
777
778 static struct file_system_type spufs_type = {
779 .owner = THIS_MODULE,
780 .name = "spufs",
781 .init_fs_context = spufs_init_fs_context,
782 .parameters = spufs_fs_parameters,
783 .kill_sb = kill_litter_super,
784 };
785 MODULE_ALIAS_FS("spufs");
786
spufs_init(void)787 static int __init spufs_init(void)
788 {
789 int ret;
790
791 ret = -ENODEV;
792 if (!spu_management_ops)
793 goto out;
794
795 ret = -ENOMEM;
796 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
797 sizeof(struct spufs_inode_info), 0,
798 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
799
800 if (!spufs_inode_cache)
801 goto out;
802 ret = spu_sched_init();
803 if (ret)
804 goto out_cache;
805 ret = register_spu_syscalls(&spufs_calls);
806 if (ret)
807 goto out_sched;
808 ret = register_filesystem(&spufs_type);
809 if (ret)
810 goto out_syscalls;
811
812 spufs_init_isolated_loader();
813
814 return 0;
815
816 out_syscalls:
817 unregister_spu_syscalls(&spufs_calls);
818 out_sched:
819 spu_sched_exit();
820 out_cache:
821 kmem_cache_destroy(spufs_inode_cache);
822 out:
823 return ret;
824 }
825 module_init(spufs_init);
826
spufs_exit(void)827 static void __exit spufs_exit(void)
828 {
829 spu_sched_exit();
830 spufs_exit_isolated_loader();
831 unregister_spu_syscalls(&spufs_calls);
832 unregister_filesystem(&spufs_type);
833 kmem_cache_destroy(spufs_inode_cache);
834 }
835 module_exit(spufs_exit);
836
837 MODULE_DESCRIPTION("SPU file system");
838 MODULE_LICENSE("GPL");
839 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
840
841