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 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
90 out:
91 return inode;
92 }
93
94 static int
spufs_setattr(struct user_namespace * mnt_userns,struct dentry * dentry,struct iattr * attr)95 spufs_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
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
spufs_prune_dir(struct dentry * dir)146 static 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 /* XXX: what was dcache_lock protecting here? Other
159 * filesystems (IB, configfs) release dcache_lock
160 * before unlink */
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 /* Caller must hold parent->i_mutex */
spufs_rmdir(struct inode * parent,struct dentry * dir)171 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
172 {
173 /* remove all entries */
174 int res;
175 spufs_prune_dir(dir);
176 d_drop(dir);
177 res = simple_rmdir(parent, dir);
178 /* We have to give up the mm_struct */
179 spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
180 return res;
181 }
182
spufs_fill_dir(struct dentry * dir,const struct spufs_tree_descr * files,umode_t mode,struct spu_context * ctx)183 static 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
spufs_dir_close(struct inode * inode,struct file * file)201 static 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
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 inode_init_owner(&init_user_ns, inode, dir, mode | S_IFDIR);
241 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX 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
spufs_context_open(const struct path * path)278 static int spufs_context_open(const 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
298 static struct spu_context *
spufs_assert_affinity(unsigned int flags,struct spu_gang * gang,struct file * filp)299 spufs_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
364 out_put_neighbor:
365 put_spu_context(neighbor);
366 return err;
367 }
368
369 static void
spufs_set_affinity(unsigned int flags,struct spu_context * ctx,struct spu_context * neighbor)370 spufs_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
400 static int
spufs_create_context(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,int flags,umode_t mode,struct file * aff_filp)401 spufs_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
452 out_aff_unlock:
453 if (affinity)
454 mutex_unlock(&gang->aff_mutex);
455 return ret;
456 }
457
458 static int
spufs_mkgang(struct inode * dir,struct dentry * dentry,umode_t mode)459 spufs_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
488 out_iput:
489 iput(inode);
490 out:
491 return ret;
492 }
493
spufs_gang_open(const struct path * path)494 static int spufs_gang_open(const 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 * get references for dget and mntget, will be released
505 * in error path of *_open().
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
spufs_create_gang(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,umode_t mode)518 static 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
537 static struct file_system_type spufs_type;
538
spufs_create(const struct path * path,struct dentry * dentry,unsigned int flags,umode_t mode,struct file * filp)539 long spufs_create(const 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 /* check if we are on spufs */
546 if (path->dentry->d_sb->s_type != &spufs_type)
547 return -EINVAL;
548
549 /* don't accept undefined flags */
550 if (flags & (~SPU_CREATE_FLAG_ALL))
551 return -EINVAL;
552
553 /* only threads can be underneath a gang */
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 /* File system initialization */
572 struct spufs_fs_context {
573 kuid_t uid;
574 kgid_t gid;
575 umode_t mode;
576 };
577
578 enum {
579 Opt_uid, Opt_gid, Opt_mode, Opt_debug,
580 };
581
582 static 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
spufs_show_options(struct seq_file * m,struct dentry * root)590 static 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
spufs_parse_param(struct fs_context * fc,struct fs_parameter * param)608 static 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
spufs_exit_isolated_loader(void)645 static void spufs_exit_isolated_loader(void)
646 {
647 free_pages((unsigned long) isolated_loader,
648 get_order(isolated_loader_size));
649 }
650
651 static void __init
spufs_init_isolated_loader(void)652 spufs_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 of_node_put(dn);
664 if (!loader)
665 return;
666
667 /* the loader must be align on a 16 byte boundary */
668 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
669 if (!isolated_loader)
670 return;
671
672 isolated_loader_size = size;
673 memcpy(isolated_loader, loader, size);
674 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
675 }
676
spufs_create_root(struct super_block * sb,struct fs_context * fc)677 static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
678 {
679 struct spufs_fs_context *ctx = fc->fs_private;
680 struct inode *inode;
681
682 if (!spu_management_ops)
683 return -ENODEV;
684
685 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
686 if (!inode)
687 return -ENOMEM;
688
689 inode->i_uid = ctx->uid;
690 inode->i_gid = ctx->gid;
691 inode->i_op = &simple_dir_inode_operations;
692 inode->i_fop = &simple_dir_operations;
693 SPUFS_I(inode)->i_ctx = NULL;
694 inc_nlink(inode);
695
696 sb->s_root = d_make_root(inode);
697 if (!sb->s_root)
698 return -ENOMEM;
699 return 0;
700 }
701
702 static const struct super_operations spufs_ops = {
703 .alloc_inode = spufs_alloc_inode,
704 .free_inode = spufs_free_inode,
705 .statfs = simple_statfs,
706 .evict_inode = spufs_evict_inode,
707 .show_options = spufs_show_options,
708 };
709
spufs_fill_super(struct super_block * sb,struct fs_context * fc)710 static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
711 {
712 sb->s_maxbytes = MAX_LFS_FILESIZE;
713 sb->s_blocksize = PAGE_SIZE;
714 sb->s_blocksize_bits = PAGE_SHIFT;
715 sb->s_magic = SPUFS_MAGIC;
716 sb->s_op = &spufs_ops;
717
718 return spufs_create_root(sb, fc);
719 }
720
spufs_get_tree(struct fs_context * fc)721 static int spufs_get_tree(struct fs_context *fc)
722 {
723 return get_tree_single(fc, spufs_fill_super);
724 }
725
spufs_free_fc(struct fs_context * fc)726 static void spufs_free_fc(struct fs_context *fc)
727 {
728 kfree(fc->s_fs_info);
729 }
730
731 static const struct fs_context_operations spufs_context_ops = {
732 .free = spufs_free_fc,
733 .parse_param = spufs_parse_param,
734 .get_tree = spufs_get_tree,
735 };
736
spufs_init_fs_context(struct fs_context * fc)737 static int spufs_init_fs_context(struct fs_context *fc)
738 {
739 struct spufs_fs_context *ctx;
740 struct spufs_sb_info *sbi;
741
742 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
743 if (!ctx)
744 goto nomem;
745
746 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
747 if (!sbi)
748 goto nomem_ctx;
749
750 ctx->uid = current_uid();
751 ctx->gid = current_gid();
752 ctx->mode = 0755;
753
754 fc->fs_private = ctx;
755 fc->s_fs_info = sbi;
756 fc->ops = &spufs_context_ops;
757 return 0;
758
759 nomem_ctx:
760 kfree(ctx);
761 nomem:
762 return -ENOMEM;
763 }
764
765 static struct file_system_type spufs_type = {
766 .owner = THIS_MODULE,
767 .name = "spufs",
768 .init_fs_context = spufs_init_fs_context,
769 .parameters = spufs_fs_parameters,
770 .kill_sb = kill_litter_super,
771 };
772 MODULE_ALIAS_FS("spufs");
773
spufs_init(void)774 static int __init spufs_init(void)
775 {
776 int ret;
777
778 ret = -ENODEV;
779 if (!spu_management_ops)
780 goto out;
781
782 ret = -ENOMEM;
783 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
784 sizeof(struct spufs_inode_info), 0,
785 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
786
787 if (!spufs_inode_cache)
788 goto out;
789 ret = spu_sched_init();
790 if (ret)
791 goto out_cache;
792 ret = register_spu_syscalls(&spufs_calls);
793 if (ret)
794 goto out_sched;
795 ret = register_filesystem(&spufs_type);
796 if (ret)
797 goto out_syscalls;
798
799 spufs_init_isolated_loader();
800
801 return 0;
802
803 out_syscalls:
804 unregister_spu_syscalls(&spufs_calls);
805 out_sched:
806 spu_sched_exit();
807 out_cache:
808 kmem_cache_destroy(spufs_inode_cache);
809 out:
810 return ret;
811 }
812 module_init(spufs_init);
813
spufs_exit(void)814 static void __exit spufs_exit(void)
815 {
816 spu_sched_exit();
817 spufs_exit_isolated_loader();
818 unregister_spu_syscalls(&spufs_calls);
819 unregister_filesystem(&spufs_type);
820 kmem_cache_destroy(spufs_inode_cache);
821 }
822 module_exit(spufs_exit);
823
824 MODULE_LICENSE("GPL");
825 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
826
827