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
spufs_prune_dir(struct dentry * dir)146 static void spufs_prune_dir(struct dentry *dir)
147 {
148 struct dentry *dentry;
149 struct hlist_node *n;
150
151 inode_lock(d_inode(dir));
152 hlist_for_each_entry_safe(dentry, n, &dir->d_children, d_sib) {
153 spin_lock(&dentry->d_lock);
154 if (simple_positive(dentry)) {
155 dget_dlock(dentry);
156 __d_drop(dentry);
157 spin_unlock(&dentry->d_lock);
158 simple_unlink(d_inode(dir), dentry);
159 /* XXX: what was dcache_lock protecting here? Other
160 * filesystems (IB, configfs) release dcache_lock
161 * before unlink */
162 dput(dentry);
163 } else {
164 spin_unlock(&dentry->d_lock);
165 }
166 }
167 shrink_dcache_parent(dir);
168 inode_unlock(d_inode(dir));
169 }
170
171 /* Caller must hold parent->i_mutex */
spufs_rmdir(struct inode * parent,struct dentry * dir)172 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
173 {
174 /* remove all entries */
175 int res;
176 spufs_prune_dir(dir);
177 d_drop(dir);
178 res = simple_rmdir(parent, dir);
179 /* We have to give up the mm_struct */
180 spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
181 return res;
182 }
183
spufs_fill_dir(struct dentry * dir,const struct spufs_tree_descr * files,umode_t mode,struct spu_context * ctx)184 static int spufs_fill_dir(struct dentry *dir,
185 const struct spufs_tree_descr *files, umode_t mode,
186 struct spu_context *ctx)
187 {
188 while (files->name && files->name[0]) {
189 int ret;
190 struct dentry *dentry = d_alloc_name(dir, files->name);
191 if (!dentry)
192 return -ENOMEM;
193 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
194 files->mode & mode, files->size, ctx);
195 if (ret)
196 return ret;
197 files++;
198 }
199 return 0;
200 }
201
spufs_dir_close(struct inode * inode,struct file * file)202 static int spufs_dir_close(struct inode *inode, struct file *file)
203 {
204 struct inode *parent;
205 struct dentry *dir;
206 int ret;
207
208 dir = file->f_path.dentry;
209 parent = d_inode(dir->d_parent);
210
211 inode_lock_nested(parent, I_MUTEX_PARENT);
212 ret = spufs_rmdir(parent, dir);
213 inode_unlock(parent);
214 WARN_ON(ret);
215
216 return dcache_dir_close(inode, file);
217 }
218
219 const struct file_operations spufs_context_fops = {
220 .open = dcache_dir_open,
221 .release = spufs_dir_close,
222 .llseek = dcache_dir_lseek,
223 .read = generic_read_dir,
224 .iterate_shared = dcache_readdir,
225 .fsync = noop_fsync,
226 };
227 EXPORT_SYMBOL_GPL(spufs_context_fops);
228
229 static int
spufs_mkdir(struct inode * dir,struct dentry * dentry,unsigned int flags,umode_t mode)230 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
231 umode_t mode)
232 {
233 int ret;
234 struct inode *inode;
235 struct spu_context *ctx;
236
237 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
238 if (!inode)
239 return -ENOSPC;
240
241 inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR);
242 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
243 SPUFS_I(inode)->i_ctx = ctx;
244 if (!ctx) {
245 iput(inode);
246 return -ENOSPC;
247 }
248
249 ctx->flags = flags;
250 inode->i_op = &simple_dir_inode_operations;
251 inode->i_fop = &simple_dir_operations;
252
253 inode_lock(inode);
254
255 dget(dentry);
256 inc_nlink(dir);
257 inc_nlink(inode);
258
259 d_instantiate(dentry, inode);
260
261 if (flags & SPU_CREATE_NOSCHED)
262 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
263 mode, ctx);
264 else
265 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
266
267 if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
268 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
269 mode, ctx);
270
271 if (ret)
272 spufs_rmdir(dir, dentry);
273
274 inode_unlock(inode);
275
276 return ret;
277 }
278
spufs_context_open(const struct path * path)279 static int spufs_context_open(const struct path *path)
280 {
281 int ret;
282 struct file *filp;
283
284 ret = get_unused_fd_flags(0);
285 if (ret < 0)
286 return ret;
287
288 filp = dentry_open(path, O_RDONLY, current_cred());
289 if (IS_ERR(filp)) {
290 put_unused_fd(ret);
291 return PTR_ERR(filp);
292 }
293
294 filp->f_op = &spufs_context_fops;
295 fd_install(ret, filp);
296 return ret;
297 }
298
299 static struct spu_context *
spufs_assert_affinity(unsigned int flags,struct spu_gang * gang,struct file * filp)300 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
301 struct file *filp)
302 {
303 struct spu_context *tmp, *neighbor, *err;
304 int count, node;
305 int aff_supp;
306
307 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
308 struct spu, cbe_list))->aff_list);
309
310 if (!aff_supp)
311 return ERR_PTR(-EINVAL);
312
313 if (flags & SPU_CREATE_GANG)
314 return ERR_PTR(-EINVAL);
315
316 if (flags & SPU_CREATE_AFFINITY_MEM &&
317 gang->aff_ref_ctx &&
318 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
319 return ERR_PTR(-EEXIST);
320
321 if (gang->aff_flags & AFF_MERGED)
322 return ERR_PTR(-EBUSY);
323
324 neighbor = NULL;
325 if (flags & SPU_CREATE_AFFINITY_SPU) {
326 if (!filp || filp->f_op != &spufs_context_fops)
327 return ERR_PTR(-EINVAL);
328
329 neighbor = get_spu_context(
330 SPUFS_I(file_inode(filp))->i_ctx);
331
332 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
333 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
334 !list_entry(neighbor->aff_list.next, struct spu_context,
335 aff_list)->aff_head) {
336 err = ERR_PTR(-EEXIST);
337 goto out_put_neighbor;
338 }
339
340 if (gang != neighbor->gang) {
341 err = ERR_PTR(-EINVAL);
342 goto out_put_neighbor;
343 }
344
345 count = 1;
346 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
347 count++;
348 if (list_empty(&neighbor->aff_list))
349 count++;
350
351 for (node = 0; node < MAX_NUMNODES; node++) {
352 if ((cbe_spu_info[node].n_spus - atomic_read(
353 &cbe_spu_info[node].reserved_spus)) >= count)
354 break;
355 }
356
357 if (node == MAX_NUMNODES) {
358 err = ERR_PTR(-EEXIST);
359 goto out_put_neighbor;
360 }
361 }
362
363 return neighbor;
364
365 out_put_neighbor:
366 put_spu_context(neighbor);
367 return err;
368 }
369
370 static void
spufs_set_affinity(unsigned int flags,struct spu_context * ctx,struct spu_context * neighbor)371 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
372 struct spu_context *neighbor)
373 {
374 if (flags & SPU_CREATE_AFFINITY_MEM)
375 ctx->gang->aff_ref_ctx = ctx;
376
377 if (flags & SPU_CREATE_AFFINITY_SPU) {
378 if (list_empty(&neighbor->aff_list)) {
379 list_add_tail(&neighbor->aff_list,
380 &ctx->gang->aff_list_head);
381 neighbor->aff_head = 1;
382 }
383
384 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
385 || list_entry(neighbor->aff_list.next, struct spu_context,
386 aff_list)->aff_head) {
387 list_add(&ctx->aff_list, &neighbor->aff_list);
388 } else {
389 list_add_tail(&ctx->aff_list, &neighbor->aff_list);
390 if (neighbor->aff_head) {
391 neighbor->aff_head = 0;
392 ctx->aff_head = 1;
393 }
394 }
395
396 if (!ctx->gang->aff_ref_ctx)
397 ctx->gang->aff_ref_ctx = ctx;
398 }
399 }
400
401 static int
spufs_create_context(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,int flags,umode_t mode,struct file * aff_filp)402 spufs_create_context(struct inode *inode, struct dentry *dentry,
403 struct vfsmount *mnt, int flags, umode_t mode,
404 struct file *aff_filp)
405 {
406 int ret;
407 int affinity;
408 struct spu_gang *gang;
409 struct spu_context *neighbor;
410 struct path path = {.mnt = mnt, .dentry = dentry};
411
412 if ((flags & SPU_CREATE_NOSCHED) &&
413 !capable(CAP_SYS_NICE))
414 return -EPERM;
415
416 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
417 == SPU_CREATE_ISOLATE)
418 return -EINVAL;
419
420 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
421 return -ENODEV;
422
423 gang = NULL;
424 neighbor = NULL;
425 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
426 if (affinity) {
427 gang = SPUFS_I(inode)->i_gang;
428 if (!gang)
429 return -EINVAL;
430 mutex_lock(&gang->aff_mutex);
431 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
432 if (IS_ERR(neighbor)) {
433 ret = PTR_ERR(neighbor);
434 goto out_aff_unlock;
435 }
436 }
437
438 ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
439 if (ret)
440 goto out_aff_unlock;
441
442 if (affinity) {
443 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
444 neighbor);
445 if (neighbor)
446 put_spu_context(neighbor);
447 }
448
449 ret = spufs_context_open(&path);
450 if (ret < 0)
451 WARN_ON(spufs_rmdir(inode, dentry));
452
453 out_aff_unlock:
454 if (affinity)
455 mutex_unlock(&gang->aff_mutex);
456 return ret;
457 }
458
459 static int
spufs_mkgang(struct inode * dir,struct dentry * dentry,umode_t mode)460 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
461 {
462 int ret;
463 struct inode *inode;
464 struct spu_gang *gang;
465
466 ret = -ENOSPC;
467 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
468 if (!inode)
469 goto out;
470
471 ret = 0;
472 inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR);
473 gang = alloc_spu_gang();
474 SPUFS_I(inode)->i_ctx = NULL;
475 SPUFS_I(inode)->i_gang = gang;
476 if (!gang) {
477 ret = -ENOMEM;
478 goto out_iput;
479 }
480
481 inode->i_op = &simple_dir_inode_operations;
482 inode->i_fop = &simple_dir_operations;
483
484 d_instantiate(dentry, inode);
485 inc_nlink(dir);
486 inc_nlink(d_inode(dentry));
487 return ret;
488
489 out_iput:
490 iput(inode);
491 out:
492 return ret;
493 }
494
spufs_gang_open(const struct path * path)495 static int spufs_gang_open(const struct path *path)
496 {
497 int ret;
498 struct file *filp;
499
500 ret = get_unused_fd_flags(0);
501 if (ret < 0)
502 return ret;
503
504 /*
505 * get references for dget and mntget, will be released
506 * in error path of *_open().
507 */
508 filp = dentry_open(path, O_RDONLY, current_cred());
509 if (IS_ERR(filp)) {
510 put_unused_fd(ret);
511 return PTR_ERR(filp);
512 }
513
514 filp->f_op = &simple_dir_operations;
515 fd_install(ret, filp);
516 return ret;
517 }
518
spufs_create_gang(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,umode_t mode)519 static int spufs_create_gang(struct inode *inode,
520 struct dentry *dentry,
521 struct vfsmount *mnt, umode_t mode)
522 {
523 struct path path = {.mnt = mnt, .dentry = dentry};
524 int ret;
525
526 ret = spufs_mkgang(inode, dentry, mode & 0777);
527 if (!ret) {
528 ret = spufs_gang_open(&path);
529 if (ret < 0) {
530 int err = simple_rmdir(inode, dentry);
531 WARN_ON(err);
532 }
533 }
534 return ret;
535 }
536
537
538 static struct file_system_type spufs_type;
539
spufs_create(const struct path * path,struct dentry * dentry,unsigned int flags,umode_t mode,struct file * filp)540 long spufs_create(const struct path *path, struct dentry *dentry,
541 unsigned int flags, umode_t mode, struct file *filp)
542 {
543 struct inode *dir = d_inode(path->dentry);
544 int ret;
545
546 /* check if we are on spufs */
547 if (path->dentry->d_sb->s_type != &spufs_type)
548 return -EINVAL;
549
550 /* don't accept undefined flags */
551 if (flags & (~SPU_CREATE_FLAG_ALL))
552 return -EINVAL;
553
554 /* only threads can be underneath a gang */
555 if (path->dentry != path->dentry->d_sb->s_root)
556 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
557 return -EINVAL;
558
559 mode &= ~current_umask();
560
561 if (flags & SPU_CREATE_GANG)
562 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
563 else
564 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
565 filp);
566 if (ret >= 0)
567 fsnotify_mkdir(dir, dentry);
568
569 return ret;
570 }
571
572 /* File system initialization */
573 struct spufs_fs_context {
574 kuid_t uid;
575 kgid_t gid;
576 umode_t mode;
577 };
578
579 enum {
580 Opt_uid, Opt_gid, Opt_mode, Opt_debug,
581 };
582
583 static const struct fs_parameter_spec spufs_fs_parameters[] = {
584 fsparam_u32 ("gid", Opt_gid),
585 fsparam_u32oct ("mode", Opt_mode),
586 fsparam_u32 ("uid", Opt_uid),
587 fsparam_flag ("debug", Opt_debug),
588 {}
589 };
590
spufs_show_options(struct seq_file * m,struct dentry * root)591 static int spufs_show_options(struct seq_file *m, struct dentry *root)
592 {
593 struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
594 struct inode *inode = root->d_inode;
595
596 if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
597 seq_printf(m, ",uid=%u",
598 from_kuid_munged(&init_user_ns, inode->i_uid));
599 if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
600 seq_printf(m, ",gid=%u",
601 from_kgid_munged(&init_user_ns, inode->i_gid));
602 if ((inode->i_mode & S_IALLUGO) != 0775)
603 seq_printf(m, ",mode=%o", inode->i_mode);
604 if (sbi->debug)
605 seq_puts(m, ",debug");
606 return 0;
607 }
608
spufs_parse_param(struct fs_context * fc,struct fs_parameter * param)609 static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
610 {
611 struct spufs_fs_context *ctx = fc->fs_private;
612 struct spufs_sb_info *sbi = fc->s_fs_info;
613 struct fs_parse_result result;
614 kuid_t uid;
615 kgid_t gid;
616 int opt;
617
618 opt = fs_parse(fc, spufs_fs_parameters, param, &result);
619 if (opt < 0)
620 return opt;
621
622 switch (opt) {
623 case Opt_uid:
624 uid = make_kuid(current_user_ns(), result.uint_32);
625 if (!uid_valid(uid))
626 return invalf(fc, "Unknown uid");
627 ctx->uid = uid;
628 break;
629 case Opt_gid:
630 gid = make_kgid(current_user_ns(), result.uint_32);
631 if (!gid_valid(gid))
632 return invalf(fc, "Unknown gid");
633 ctx->gid = gid;
634 break;
635 case Opt_mode:
636 ctx->mode = result.uint_32 & S_IALLUGO;
637 break;
638 case Opt_debug:
639 sbi->debug = true;
640 break;
641 }
642
643 return 0;
644 }
645
spufs_exit_isolated_loader(void)646 static void spufs_exit_isolated_loader(void)
647 {
648 free_pages((unsigned long) isolated_loader,
649 get_order(isolated_loader_size));
650 }
651
652 static void __init
spufs_init_isolated_loader(void)653 spufs_init_isolated_loader(void)
654 {
655 struct device_node *dn;
656 const char *loader;
657 int size;
658
659 dn = of_find_node_by_path("/spu-isolation");
660 if (!dn)
661 return;
662
663 loader = of_get_property(dn, "loader", &size);
664 of_node_put(dn);
665 if (!loader)
666 return;
667
668 /* the loader must be align on a 16 byte boundary */
669 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
670 if (!isolated_loader)
671 return;
672
673 isolated_loader_size = size;
674 memcpy(isolated_loader, loader, size);
675 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
676 }
677
spufs_create_root(struct super_block * sb,struct fs_context * fc)678 static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
679 {
680 struct spufs_fs_context *ctx = fc->fs_private;
681 struct inode *inode;
682
683 if (!spu_management_ops)
684 return -ENODEV;
685
686 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
687 if (!inode)
688 return -ENOMEM;
689
690 inode->i_uid = ctx->uid;
691 inode->i_gid = ctx->gid;
692 inode->i_op = &simple_dir_inode_operations;
693 inode->i_fop = &simple_dir_operations;
694 SPUFS_I(inode)->i_ctx = NULL;
695 inc_nlink(inode);
696
697 sb->s_root = d_make_root(inode);
698 if (!sb->s_root)
699 return -ENOMEM;
700 return 0;
701 }
702
703 static const struct super_operations spufs_ops = {
704 .alloc_inode = spufs_alloc_inode,
705 .free_inode = spufs_free_inode,
706 .statfs = simple_statfs,
707 .evict_inode = spufs_evict_inode,
708 .show_options = spufs_show_options,
709 };
710
spufs_fill_super(struct super_block * sb,struct fs_context * fc)711 static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
712 {
713 sb->s_maxbytes = MAX_LFS_FILESIZE;
714 sb->s_blocksize = PAGE_SIZE;
715 sb->s_blocksize_bits = PAGE_SHIFT;
716 sb->s_magic = SPUFS_MAGIC;
717 sb->s_op = &spufs_ops;
718
719 return spufs_create_root(sb, fc);
720 }
721
spufs_get_tree(struct fs_context * fc)722 static int spufs_get_tree(struct fs_context *fc)
723 {
724 return get_tree_single(fc, spufs_fill_super);
725 }
726
spufs_free_fc(struct fs_context * fc)727 static void spufs_free_fc(struct fs_context *fc)
728 {
729 kfree(fc->s_fs_info);
730 }
731
732 static const struct fs_context_operations spufs_context_ops = {
733 .free = spufs_free_fc,
734 .parse_param = spufs_parse_param,
735 .get_tree = spufs_get_tree,
736 };
737
spufs_init_fs_context(struct fs_context * fc)738 static int spufs_init_fs_context(struct fs_context *fc)
739 {
740 struct spufs_fs_context *ctx;
741 struct spufs_sb_info *sbi;
742
743 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
744 if (!ctx)
745 goto nomem;
746
747 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
748 if (!sbi)
749 goto nomem_ctx;
750
751 ctx->uid = current_uid();
752 ctx->gid = current_gid();
753 ctx->mode = 0755;
754
755 fc->fs_private = ctx;
756 fc->s_fs_info = sbi;
757 fc->ops = &spufs_context_ops;
758 return 0;
759
760 nomem_ctx:
761 kfree(ctx);
762 nomem:
763 return -ENOMEM;
764 }
765
766 static struct file_system_type spufs_type = {
767 .owner = THIS_MODULE,
768 .name = "spufs",
769 .init_fs_context = spufs_init_fs_context,
770 .parameters = spufs_fs_parameters,
771 .kill_sb = kill_litter_super,
772 };
773 MODULE_ALIAS_FS("spufs");
774
spufs_init(void)775 static int __init spufs_init(void)
776 {
777 int ret;
778
779 ret = -ENODEV;
780 if (!spu_management_ops)
781 goto out;
782
783 ret = -ENOMEM;
784 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
785 sizeof(struct spufs_inode_info), 0,
786 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
787
788 if (!spufs_inode_cache)
789 goto out;
790 ret = spu_sched_init();
791 if (ret)
792 goto out_cache;
793 ret = register_spu_syscalls(&spufs_calls);
794 if (ret)
795 goto out_sched;
796 ret = register_filesystem(&spufs_type);
797 if (ret)
798 goto out_syscalls;
799
800 spufs_init_isolated_loader();
801
802 return 0;
803
804 out_syscalls:
805 unregister_spu_syscalls(&spufs_calls);
806 out_sched:
807 spu_sched_exit();
808 out_cache:
809 kmem_cache_destroy(spufs_inode_cache);
810 out:
811 return ret;
812 }
813 module_init(spufs_init);
814
spufs_exit(void)815 static void __exit spufs_exit(void)
816 {
817 spu_sched_exit();
818 spufs_exit_isolated_loader();
819 unregister_spu_syscalls(&spufs_calls);
820 unregister_filesystem(&spufs_type);
821 kmem_cache_destroy(spufs_inode_cache);
822 }
823 module_exit(spufs_exit);
824
825 MODULE_DESCRIPTION("SPU file system");
826 MODULE_LICENSE("GPL");
827 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
828
829