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/slab.h>
25
26 #include <asm/prom.h>
27 #include <asm/spu.h>
28 #include <asm/spu_priv1.h>
29 #include <linux/uaccess.h>
30
31 #include "spufs.h"
32
33 struct spufs_sb_info {
34 bool debug;
35 };
36
37 static struct kmem_cache *spufs_inode_cache;
38 char *isolated_loader;
39 static int isolated_loader_size;
40
spufs_get_sb_info(struct super_block * sb)41 static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
42 {
43 return sb->s_fs_info;
44 }
45
46 static struct inode *
spufs_alloc_inode(struct super_block * sb)47 spufs_alloc_inode(struct super_block *sb)
48 {
49 struct spufs_inode_info *ei;
50
51 ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
52 if (!ei)
53 return NULL;
54
55 ei->i_gang = NULL;
56 ei->i_ctx = NULL;
57 ei->i_openers = 0;
58
59 return &ei->vfs_inode;
60 }
61
spufs_free_inode(struct inode * inode)62 static void spufs_free_inode(struct inode *inode)
63 {
64 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
65 }
66
67 static void
spufs_init_once(void * p)68 spufs_init_once(void *p)
69 {
70 struct spufs_inode_info *ei = p;
71
72 inode_init_once(&ei->vfs_inode);
73 }
74
75 static struct inode *
spufs_new_inode(struct super_block * sb,umode_t mode)76 spufs_new_inode(struct super_block *sb, umode_t mode)
77 {
78 struct inode *inode;
79
80 inode = new_inode(sb);
81 if (!inode)
82 goto out;
83
84 inode->i_ino = get_next_ino();
85 inode->i_mode = mode;
86 inode->i_uid = current_fsuid();
87 inode->i_gid = current_fsgid();
88 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
89 out:
90 return inode;
91 }
92
93 static int
spufs_setattr(struct dentry * dentry,struct iattr * attr)94 spufs_setattr(struct dentry *dentry, struct iattr *attr)
95 {
96 struct inode *inode = d_inode(dentry);
97
98 if ((attr->ia_valid & ATTR_SIZE) &&
99 (attr->ia_size != inode->i_size))
100 return -EINVAL;
101 setattr_copy(inode, attr);
102 mark_inode_dirty(inode);
103 return 0;
104 }
105
106
107 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)108 spufs_new_file(struct super_block *sb, struct dentry *dentry,
109 const struct file_operations *fops, umode_t mode,
110 size_t size, struct spu_context *ctx)
111 {
112 static const struct inode_operations spufs_file_iops = {
113 .setattr = spufs_setattr,
114 };
115 struct inode *inode;
116 int ret;
117
118 ret = -ENOSPC;
119 inode = spufs_new_inode(sb, S_IFREG | mode);
120 if (!inode)
121 goto out;
122
123 ret = 0;
124 inode->i_op = &spufs_file_iops;
125 inode->i_fop = fops;
126 inode->i_size = size;
127 inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
128 d_add(dentry, inode);
129 out:
130 return ret;
131 }
132
133 static void
spufs_evict_inode(struct inode * inode)134 spufs_evict_inode(struct inode *inode)
135 {
136 struct spufs_inode_info *ei = SPUFS_I(inode);
137 clear_inode(inode);
138 if (ei->i_ctx)
139 put_spu_context(ei->i_ctx);
140 if (ei->i_gang)
141 put_spu_gang(ei->i_gang);
142 }
143
spufs_prune_dir(struct dentry * dir)144 static void spufs_prune_dir(struct dentry *dir)
145 {
146 struct dentry *dentry, *tmp;
147
148 inode_lock(d_inode(dir));
149 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
150 spin_lock(&dentry->d_lock);
151 if (simple_positive(dentry)) {
152 dget_dlock(dentry);
153 __d_drop(dentry);
154 spin_unlock(&dentry->d_lock);
155 simple_unlink(d_inode(dir), dentry);
156 /* XXX: what was dcache_lock protecting here? Other
157 * filesystems (IB, configfs) release dcache_lock
158 * before unlink */
159 dput(dentry);
160 } else {
161 spin_unlock(&dentry->d_lock);
162 }
163 }
164 shrink_dcache_parent(dir);
165 inode_unlock(d_inode(dir));
166 }
167
168 /* Caller must hold parent->i_mutex */
spufs_rmdir(struct inode * parent,struct dentry * dir)169 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
170 {
171 /* remove all entries */
172 int res;
173 spufs_prune_dir(dir);
174 d_drop(dir);
175 res = simple_rmdir(parent, dir);
176 /* We have to give up the mm_struct */
177 spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
178 return res;
179 }
180
spufs_fill_dir(struct dentry * dir,const struct spufs_tree_descr * files,umode_t mode,struct spu_context * ctx)181 static int spufs_fill_dir(struct dentry *dir,
182 const struct spufs_tree_descr *files, umode_t mode,
183 struct spu_context *ctx)
184 {
185 while (files->name && files->name[0]) {
186 int ret;
187 struct dentry *dentry = d_alloc_name(dir, files->name);
188 if (!dentry)
189 return -ENOMEM;
190 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
191 files->mode & mode, files->size, ctx);
192 if (ret)
193 return ret;
194 files++;
195 }
196 return 0;
197 }
198
spufs_dir_close(struct inode * inode,struct file * file)199 static int spufs_dir_close(struct inode *inode, struct file *file)
200 {
201 struct spu_context *ctx;
202 struct inode *parent;
203 struct dentry *dir;
204 int ret;
205
206 dir = file->f_path.dentry;
207 parent = d_inode(dir->d_parent);
208 ctx = SPUFS_I(d_inode(dir))->i_ctx;
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
218 const 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 };
226 EXPORT_SYMBOL_GPL(spufs_context_fops);
227
228 static int
spufs_mkdir(struct inode * dir,struct dentry * dentry,unsigned int flags,umode_t mode)229 spufs_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 if (dir->i_mode & S_ISGID) {
241 inode->i_gid = dir->i_gid;
242 inode->i_mode &= S_ISGID;
243 }
244 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
245 SPUFS_I(inode)->i_ctx = ctx;
246 if (!ctx) {
247 iput(inode);
248 return -ENOSPC;
249 }
250
251 ctx->flags = flags;
252 inode->i_op = &simple_dir_inode_operations;
253 inode->i_fop = &simple_dir_operations;
254
255 inode_lock(inode);
256
257 dget(dentry);
258 inc_nlink(dir);
259 inc_nlink(inode);
260
261 d_instantiate(dentry, inode);
262
263 if (flags & SPU_CREATE_NOSCHED)
264 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
265 mode, ctx);
266 else
267 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
268
269 if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
270 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
271 mode, ctx);
272
273 if (ret)
274 spufs_rmdir(dir, dentry);
275
276 inode_unlock(inode);
277
278 return ret;
279 }
280
spufs_context_open(struct path * path)281 static int spufs_context_open(struct path *path)
282 {
283 int ret;
284 struct file *filp;
285
286 ret = get_unused_fd_flags(0);
287 if (ret < 0)
288 return ret;
289
290 filp = dentry_open(path, O_RDONLY, current_cred());
291 if (IS_ERR(filp)) {
292 put_unused_fd(ret);
293 return PTR_ERR(filp);
294 }
295
296 filp->f_op = &spufs_context_fops;
297 fd_install(ret, filp);
298 return ret;
299 }
300
301 static struct spu_context *
spufs_assert_affinity(unsigned int flags,struct spu_gang * gang,struct file * filp)302 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
303 struct file *filp)
304 {
305 struct spu_context *tmp, *neighbor, *err;
306 int count, node;
307 int aff_supp;
308
309 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
310 struct spu, cbe_list))->aff_list);
311
312 if (!aff_supp)
313 return ERR_PTR(-EINVAL);
314
315 if (flags & SPU_CREATE_GANG)
316 return ERR_PTR(-EINVAL);
317
318 if (flags & SPU_CREATE_AFFINITY_MEM &&
319 gang->aff_ref_ctx &&
320 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
321 return ERR_PTR(-EEXIST);
322
323 if (gang->aff_flags & AFF_MERGED)
324 return ERR_PTR(-EBUSY);
325
326 neighbor = NULL;
327 if (flags & SPU_CREATE_AFFINITY_SPU) {
328 if (!filp || filp->f_op != &spufs_context_fops)
329 return ERR_PTR(-EINVAL);
330
331 neighbor = get_spu_context(
332 SPUFS_I(file_inode(filp))->i_ctx);
333
334 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
335 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
336 !list_entry(neighbor->aff_list.next, struct spu_context,
337 aff_list)->aff_head) {
338 err = ERR_PTR(-EEXIST);
339 goto out_put_neighbor;
340 }
341
342 if (gang != neighbor->gang) {
343 err = ERR_PTR(-EINVAL);
344 goto out_put_neighbor;
345 }
346
347 count = 1;
348 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
349 count++;
350 if (list_empty(&neighbor->aff_list))
351 count++;
352
353 for (node = 0; node < MAX_NUMNODES; node++) {
354 if ((cbe_spu_info[node].n_spus - atomic_read(
355 &cbe_spu_info[node].reserved_spus)) >= count)
356 break;
357 }
358
359 if (node == MAX_NUMNODES) {
360 err = ERR_PTR(-EEXIST);
361 goto out_put_neighbor;
362 }
363 }
364
365 return neighbor;
366
367 out_put_neighbor:
368 put_spu_context(neighbor);
369 return err;
370 }
371
372 static void
spufs_set_affinity(unsigned int flags,struct spu_context * ctx,struct spu_context * neighbor)373 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
374 struct spu_context *neighbor)
375 {
376 if (flags & SPU_CREATE_AFFINITY_MEM)
377 ctx->gang->aff_ref_ctx = ctx;
378
379 if (flags & SPU_CREATE_AFFINITY_SPU) {
380 if (list_empty(&neighbor->aff_list)) {
381 list_add_tail(&neighbor->aff_list,
382 &ctx->gang->aff_list_head);
383 neighbor->aff_head = 1;
384 }
385
386 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
387 || list_entry(neighbor->aff_list.next, struct spu_context,
388 aff_list)->aff_head) {
389 list_add(&ctx->aff_list, &neighbor->aff_list);
390 } else {
391 list_add_tail(&ctx->aff_list, &neighbor->aff_list);
392 if (neighbor->aff_head) {
393 neighbor->aff_head = 0;
394 ctx->aff_head = 1;
395 }
396 }
397
398 if (!ctx->gang->aff_ref_ctx)
399 ctx->gang->aff_ref_ctx = ctx;
400 }
401 }
402
403 static int
spufs_create_context(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,int flags,umode_t mode,struct file * aff_filp)404 spufs_create_context(struct inode *inode, struct dentry *dentry,
405 struct vfsmount *mnt, int flags, umode_t mode,
406 struct file *aff_filp)
407 {
408 int ret;
409 int affinity;
410 struct spu_gang *gang;
411 struct spu_context *neighbor;
412 struct path path = {.mnt = mnt, .dentry = dentry};
413
414 if ((flags & SPU_CREATE_NOSCHED) &&
415 !capable(CAP_SYS_NICE))
416 return -EPERM;
417
418 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
419 == SPU_CREATE_ISOLATE)
420 return -EINVAL;
421
422 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
423 return -ENODEV;
424
425 gang = NULL;
426 neighbor = NULL;
427 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
428 if (affinity) {
429 gang = SPUFS_I(inode)->i_gang;
430 if (!gang)
431 return -EINVAL;
432 mutex_lock(&gang->aff_mutex);
433 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
434 if (IS_ERR(neighbor)) {
435 ret = PTR_ERR(neighbor);
436 goto out_aff_unlock;
437 }
438 }
439
440 ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
441 if (ret)
442 goto out_aff_unlock;
443
444 if (affinity) {
445 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
446 neighbor);
447 if (neighbor)
448 put_spu_context(neighbor);
449 }
450
451 ret = spufs_context_open(&path);
452 if (ret < 0)
453 WARN_ON(spufs_rmdir(inode, dentry));
454
455 out_aff_unlock:
456 if (affinity)
457 mutex_unlock(&gang->aff_mutex);
458 return ret;
459 }
460
461 static int
spufs_mkgang(struct inode * dir,struct dentry * dentry,umode_t mode)462 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
463 {
464 int ret;
465 struct inode *inode;
466 struct spu_gang *gang;
467
468 ret = -ENOSPC;
469 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
470 if (!inode)
471 goto out;
472
473 ret = 0;
474 if (dir->i_mode & S_ISGID) {
475 inode->i_gid = dir->i_gid;
476 inode->i_mode &= S_ISGID;
477 }
478 gang = alloc_spu_gang();
479 SPUFS_I(inode)->i_ctx = NULL;
480 SPUFS_I(inode)->i_gang = gang;
481 if (!gang) {
482 ret = -ENOMEM;
483 goto out_iput;
484 }
485
486 inode->i_op = &simple_dir_inode_operations;
487 inode->i_fop = &simple_dir_operations;
488
489 d_instantiate(dentry, inode);
490 inc_nlink(dir);
491 inc_nlink(d_inode(dentry));
492 return ret;
493
494 out_iput:
495 iput(inode);
496 out:
497 return ret;
498 }
499
spufs_gang_open(struct path * path)500 static int spufs_gang_open(struct path *path)
501 {
502 int ret;
503 struct file *filp;
504
505 ret = get_unused_fd_flags(0);
506 if (ret < 0)
507 return ret;
508
509 /*
510 * get references for dget and mntget, will be released
511 * in error path of *_open().
512 */
513 filp = dentry_open(path, O_RDONLY, current_cred());
514 if (IS_ERR(filp)) {
515 put_unused_fd(ret);
516 return PTR_ERR(filp);
517 }
518
519 filp->f_op = &simple_dir_operations;
520 fd_install(ret, filp);
521 return ret;
522 }
523
spufs_create_gang(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,umode_t mode)524 static int spufs_create_gang(struct inode *inode,
525 struct dentry *dentry,
526 struct vfsmount *mnt, umode_t mode)
527 {
528 struct path path = {.mnt = mnt, .dentry = dentry};
529 int ret;
530
531 ret = spufs_mkgang(inode, dentry, mode & 0777);
532 if (!ret) {
533 ret = spufs_gang_open(&path);
534 if (ret < 0) {
535 int err = simple_rmdir(inode, dentry);
536 WARN_ON(err);
537 }
538 }
539 return ret;
540 }
541
542
543 static struct file_system_type spufs_type;
544
spufs_create(struct path * path,struct dentry * dentry,unsigned int flags,umode_t mode,struct file * filp)545 long spufs_create(struct path *path, struct dentry *dentry,
546 unsigned int flags, umode_t mode, struct file *filp)
547 {
548 struct inode *dir = d_inode(path->dentry);
549 int ret;
550
551 /* check if we are on spufs */
552 if (path->dentry->d_sb->s_type != &spufs_type)
553 return -EINVAL;
554
555 /* don't accept undefined flags */
556 if (flags & (~SPU_CREATE_FLAG_ALL))
557 return -EINVAL;
558
559 /* only threads can be underneath a gang */
560 if (path->dentry != path->dentry->d_sb->s_root)
561 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
562 return -EINVAL;
563
564 mode &= ~current_umask();
565
566 if (flags & SPU_CREATE_GANG)
567 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
568 else
569 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
570 filp);
571 if (ret >= 0)
572 fsnotify_mkdir(dir, dentry);
573
574 return ret;
575 }
576
577 /* File system initialization */
578 struct spufs_fs_context {
579 kuid_t uid;
580 kgid_t gid;
581 umode_t mode;
582 };
583
584 enum {
585 Opt_uid, Opt_gid, Opt_mode, Opt_debug,
586 };
587
588 static const struct fs_parameter_spec spufs_param_specs[] = {
589 fsparam_u32 ("gid", Opt_gid),
590 fsparam_u32oct ("mode", Opt_mode),
591 fsparam_u32 ("uid", Opt_uid),
592 fsparam_flag ("debug", Opt_debug),
593 {}
594 };
595
596 static const struct fs_parameter_description spufs_fs_parameters = {
597 .name = "spufs",
598 .specs = spufs_param_specs,
599 };
600
spufs_show_options(struct seq_file * m,struct dentry * root)601 static int spufs_show_options(struct seq_file *m, struct dentry *root)
602 {
603 struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
604 struct inode *inode = root->d_inode;
605
606 if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
607 seq_printf(m, ",uid=%u",
608 from_kuid_munged(&init_user_ns, inode->i_uid));
609 if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
610 seq_printf(m, ",gid=%u",
611 from_kgid_munged(&init_user_ns, inode->i_gid));
612 if ((inode->i_mode & S_IALLUGO) != 0775)
613 seq_printf(m, ",mode=%o", inode->i_mode);
614 if (sbi->debug)
615 seq_puts(m, ",debug");
616 return 0;
617 }
618
spufs_parse_param(struct fs_context * fc,struct fs_parameter * param)619 static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
620 {
621 struct spufs_fs_context *ctx = fc->fs_private;
622 struct spufs_sb_info *sbi = fc->s_fs_info;
623 struct fs_parse_result result;
624 kuid_t uid;
625 kgid_t gid;
626 int opt;
627
628 opt = fs_parse(fc, &spufs_fs_parameters, param, &result);
629 if (opt < 0)
630 return opt;
631
632 switch (opt) {
633 case Opt_uid:
634 uid = make_kuid(current_user_ns(), result.uint_32);
635 if (!uid_valid(uid))
636 return invalf(fc, "Unknown uid");
637 ctx->uid = uid;
638 break;
639 case Opt_gid:
640 gid = make_kgid(current_user_ns(), result.uint_32);
641 if (!gid_valid(gid))
642 return invalf(fc, "Unknown gid");
643 ctx->gid = gid;
644 break;
645 case Opt_mode:
646 ctx->mode = result.uint_32 & S_IALLUGO;
647 break;
648 case Opt_debug:
649 sbi->debug = true;
650 break;
651 }
652
653 return 0;
654 }
655
spufs_exit_isolated_loader(void)656 static void spufs_exit_isolated_loader(void)
657 {
658 free_pages((unsigned long) isolated_loader,
659 get_order(isolated_loader_size));
660 }
661
662 static void
spufs_init_isolated_loader(void)663 spufs_init_isolated_loader(void)
664 {
665 struct device_node *dn;
666 const char *loader;
667 int size;
668
669 dn = of_find_node_by_path("/spu-isolation");
670 if (!dn)
671 return;
672
673 loader = of_get_property(dn, "loader", &size);
674 if (!loader)
675 return;
676
677 /* the loader must be align on a 16 byte boundary */
678 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
679 if (!isolated_loader)
680 return;
681
682 isolated_loader_size = size;
683 memcpy(isolated_loader, loader, size);
684 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
685 }
686
spufs_create_root(struct super_block * sb,struct fs_context * fc)687 static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
688 {
689 struct spufs_fs_context *ctx = fc->fs_private;
690 struct inode *inode;
691
692 if (!spu_management_ops)
693 return -ENODEV;
694
695 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
696 if (!inode)
697 return -ENOMEM;
698
699 inode->i_uid = ctx->uid;
700 inode->i_gid = ctx->gid;
701 inode->i_op = &simple_dir_inode_operations;
702 inode->i_fop = &simple_dir_operations;
703 SPUFS_I(inode)->i_ctx = NULL;
704 inc_nlink(inode);
705
706 sb->s_root = d_make_root(inode);
707 if (!sb->s_root)
708 return -ENOMEM;
709 return 0;
710 }
711
712 static const struct super_operations spufs_ops = {
713 .alloc_inode = spufs_alloc_inode,
714 .free_inode = spufs_free_inode,
715 .statfs = simple_statfs,
716 .evict_inode = spufs_evict_inode,
717 .show_options = spufs_show_options,
718 };
719
spufs_fill_super(struct super_block * sb,struct fs_context * fc)720 static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
721 {
722 sb->s_maxbytes = MAX_LFS_FILESIZE;
723 sb->s_blocksize = PAGE_SIZE;
724 sb->s_blocksize_bits = PAGE_SHIFT;
725 sb->s_magic = SPUFS_MAGIC;
726 sb->s_op = &spufs_ops;
727
728 return spufs_create_root(sb, fc);
729 }
730
spufs_get_tree(struct fs_context * fc)731 static int spufs_get_tree(struct fs_context *fc)
732 {
733 return get_tree_single(fc, spufs_fill_super);
734 }
735
spufs_free_fc(struct fs_context * fc)736 static void spufs_free_fc(struct fs_context *fc)
737 {
738 kfree(fc->s_fs_info);
739 }
740
741 static const struct fs_context_operations spufs_context_ops = {
742 .free = spufs_free_fc,
743 .parse_param = spufs_parse_param,
744 .get_tree = spufs_get_tree,
745 };
746
spufs_init_fs_context(struct fs_context * fc)747 static int spufs_init_fs_context(struct fs_context *fc)
748 {
749 struct spufs_fs_context *ctx;
750 struct spufs_sb_info *sbi;
751
752 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
753 if (!ctx)
754 goto nomem;
755
756 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
757 if (!sbi)
758 goto nomem_ctx;
759
760 ctx->uid = current_uid();
761 ctx->gid = current_gid();
762 ctx->mode = 0755;
763
764 fc->fs_private = ctx;
765 fc->s_fs_info = sbi;
766 fc->ops = &spufs_context_ops;
767 return 0;
768
769 nomem_ctx:
770 kfree(ctx);
771 nomem:
772 return -ENOMEM;
773 }
774
775 static struct file_system_type spufs_type = {
776 .owner = THIS_MODULE,
777 .name = "spufs",
778 .init_fs_context = spufs_init_fs_context,
779 .parameters = &spufs_fs_parameters,
780 .kill_sb = kill_litter_super,
781 };
782 MODULE_ALIAS_FS("spufs");
783
spufs_init(void)784 static int __init spufs_init(void)
785 {
786 int ret;
787
788 ret = -ENODEV;
789 if (!spu_management_ops)
790 goto out;
791
792 ret = -ENOMEM;
793 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
794 sizeof(struct spufs_inode_info), 0,
795 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
796
797 if (!spufs_inode_cache)
798 goto out;
799 ret = spu_sched_init();
800 if (ret)
801 goto out_cache;
802 ret = register_spu_syscalls(&spufs_calls);
803 if (ret)
804 goto out_sched;
805 ret = register_filesystem(&spufs_type);
806 if (ret)
807 goto out_syscalls;
808
809 spufs_init_isolated_loader();
810
811 return 0;
812
813 out_syscalls:
814 unregister_spu_syscalls(&spufs_calls);
815 out_sched:
816 spu_sched_exit();
817 out_cache:
818 kmem_cache_destroy(spufs_inode_cache);
819 out:
820 return ret;
821 }
822 module_init(spufs_init);
823
spufs_exit(void)824 static void __exit spufs_exit(void)
825 {
826 spu_sched_exit();
827 spufs_exit_isolated_loader();
828 unregister_spu_syscalls(&spufs_calls);
829 unregister_filesystem(&spufs_type);
830 kmem_cache_destroy(spufs_inode_cache);
831 }
832 module_exit(spufs_exit);
833
834 MODULE_LICENSE("GPL");
835 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
836
837
