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_set_ctime_current(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, *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 dput(dentry);
196 return ret;
197 }
198 files++;
199 }
200 return 0;
201 }
202
unuse_gang(struct dentry * dir)203 static void unuse_gang(struct dentry *dir)
204 {
205 struct inode *inode = dir->d_inode;
206 struct spu_gang *gang = SPUFS_I(inode)->i_gang;
207
208 if (gang) {
209 bool dead;
210
211 inode_lock(inode); // exclusion with spufs_create_context()
212 dead = !--gang->alive;
213 inode_unlock(inode);
214
215 if (dead)
216 simple_recursive_removal(dir, NULL);
217 }
218 }
219
spufs_dir_close(struct inode * inode,struct file * file)220 static int spufs_dir_close(struct inode *inode, struct file *file)
221 {
222 struct inode *parent;
223 struct dentry *dir;
224 int ret;
225
226 dir = file->f_path.dentry;
227 parent = d_inode(dir->d_parent);
228
229 inode_lock_nested(parent, I_MUTEX_PARENT);
230 ret = spufs_rmdir(parent, dir);
231 inode_unlock(parent);
232 WARN_ON(ret);
233
234 unuse_gang(dir->d_parent);
235 return dcache_dir_close(inode, file);
236 }
237
238 const struct file_operations spufs_context_fops = {
239 .open = dcache_dir_open,
240 .release = spufs_dir_close,
241 .llseek = dcache_dir_lseek,
242 .read = generic_read_dir,
243 .iterate_shared = dcache_readdir,
244 .fsync = noop_fsync,
245 };
246 EXPORT_SYMBOL_GPL(spufs_context_fops);
247
248 static int
spufs_mkdir(struct inode * dir,struct dentry * dentry,unsigned int flags,umode_t mode)249 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
250 umode_t mode)
251 {
252 int ret;
253 struct inode *inode;
254 struct spu_context *ctx;
255
256 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
257 if (!inode)
258 return -ENOSPC;
259
260 inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR);
261 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
262 SPUFS_I(inode)->i_ctx = ctx;
263 if (!ctx) {
264 iput(inode);
265 return -ENOSPC;
266 }
267
268 ctx->flags = flags;
269 inode->i_op = &simple_dir_inode_operations;
270 inode->i_fop = &simple_dir_operations;
271
272 inode_lock(inode);
273
274 dget(dentry);
275 inc_nlink(dir);
276 inc_nlink(inode);
277
278 d_instantiate(dentry, inode);
279
280 if (flags & SPU_CREATE_NOSCHED)
281 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
282 mode, ctx);
283 else
284 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
285
286 if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
287 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
288 mode, ctx);
289
290 if (ret)
291 spufs_rmdir(dir, dentry);
292
293 inode_unlock(inode);
294
295 return ret;
296 }
297
spufs_context_open(const struct path * path)298 static int spufs_context_open(const struct path *path)
299 {
300 int ret;
301 struct file *filp;
302
303 ret = get_unused_fd_flags(0);
304 if (ret < 0)
305 return ret;
306
307 filp = dentry_open(path, O_RDONLY, current_cred());
308 if (IS_ERR(filp)) {
309 put_unused_fd(ret);
310 return PTR_ERR(filp);
311 }
312
313 filp->f_op = &spufs_context_fops;
314 fd_install(ret, filp);
315 return ret;
316 }
317
318 static struct spu_context *
spufs_assert_affinity(unsigned int flags,struct spu_gang * gang,struct file * filp)319 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
320 struct file *filp)
321 {
322 struct spu_context *tmp, *neighbor, *err;
323 int count, node;
324 int aff_supp;
325
326 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
327 struct spu, cbe_list))->aff_list);
328
329 if (!aff_supp)
330 return ERR_PTR(-EINVAL);
331
332 if (flags & SPU_CREATE_GANG)
333 return ERR_PTR(-EINVAL);
334
335 if (flags & SPU_CREATE_AFFINITY_MEM &&
336 gang->aff_ref_ctx &&
337 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
338 return ERR_PTR(-EEXIST);
339
340 if (gang->aff_flags & AFF_MERGED)
341 return ERR_PTR(-EBUSY);
342
343 neighbor = NULL;
344 if (flags & SPU_CREATE_AFFINITY_SPU) {
345 if (!filp || filp->f_op != &spufs_context_fops)
346 return ERR_PTR(-EINVAL);
347
348 neighbor = get_spu_context(
349 SPUFS_I(file_inode(filp))->i_ctx);
350
351 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
352 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
353 !list_entry(neighbor->aff_list.next, struct spu_context,
354 aff_list)->aff_head) {
355 err = ERR_PTR(-EEXIST);
356 goto out_put_neighbor;
357 }
358
359 if (gang != neighbor->gang) {
360 err = ERR_PTR(-EINVAL);
361 goto out_put_neighbor;
362 }
363
364 count = 1;
365 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
366 count++;
367 if (list_empty(&neighbor->aff_list))
368 count++;
369
370 for (node = 0; node < MAX_NUMNODES; node++) {
371 if ((cbe_spu_info[node].n_spus - atomic_read(
372 &cbe_spu_info[node].reserved_spus)) >= count)
373 break;
374 }
375
376 if (node == MAX_NUMNODES) {
377 err = ERR_PTR(-EEXIST);
378 goto out_put_neighbor;
379 }
380 }
381
382 return neighbor;
383
384 out_put_neighbor:
385 put_spu_context(neighbor);
386 return err;
387 }
388
389 static void
spufs_set_affinity(unsigned int flags,struct spu_context * ctx,struct spu_context * neighbor)390 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
391 struct spu_context *neighbor)
392 {
393 if (flags & SPU_CREATE_AFFINITY_MEM)
394 ctx->gang->aff_ref_ctx = ctx;
395
396 if (flags & SPU_CREATE_AFFINITY_SPU) {
397 if (list_empty(&neighbor->aff_list)) {
398 list_add_tail(&neighbor->aff_list,
399 &ctx->gang->aff_list_head);
400 neighbor->aff_head = 1;
401 }
402
403 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
404 || list_entry(neighbor->aff_list.next, struct spu_context,
405 aff_list)->aff_head) {
406 list_add(&ctx->aff_list, &neighbor->aff_list);
407 } else {
408 list_add_tail(&ctx->aff_list, &neighbor->aff_list);
409 if (neighbor->aff_head) {
410 neighbor->aff_head = 0;
411 ctx->aff_head = 1;
412 }
413 }
414
415 if (!ctx->gang->aff_ref_ctx)
416 ctx->gang->aff_ref_ctx = ctx;
417 }
418 }
419
420 static int
spufs_create_context(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,int flags,umode_t mode,struct file * aff_filp)421 spufs_create_context(struct inode *inode, struct dentry *dentry,
422 struct vfsmount *mnt, int flags, umode_t mode,
423 struct file *aff_filp)
424 {
425 int ret;
426 int affinity;
427 struct spu_gang *gang = SPUFS_I(inode)->i_gang;
428 struct spu_context *neighbor;
429 struct path path = {.mnt = mnt, .dentry = dentry};
430
431 if ((flags & SPU_CREATE_NOSCHED) &&
432 !capable(CAP_SYS_NICE))
433 return -EPERM;
434
435 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
436 == SPU_CREATE_ISOLATE)
437 return -EINVAL;
438
439 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
440 return -ENODEV;
441
442 if (gang) {
443 if (!gang->alive)
444 return -ENOENT;
445 gang->alive++;
446 }
447
448 neighbor = NULL;
449 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
450 if (affinity) {
451 if (!gang)
452 return -EINVAL;
453 mutex_lock(&gang->aff_mutex);
454 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
455 if (IS_ERR(neighbor)) {
456 ret = PTR_ERR(neighbor);
457 goto out_aff_unlock;
458 }
459 }
460
461 ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
462 if (ret) {
463 if (neighbor)
464 put_spu_context(neighbor);
465 goto out_aff_unlock;
466 }
467
468 if (affinity) {
469 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
470 neighbor);
471 if (neighbor)
472 put_spu_context(neighbor);
473 }
474
475 ret = spufs_context_open(&path);
476 if (ret < 0)
477 WARN_ON(spufs_rmdir(inode, dentry));
478
479 out_aff_unlock:
480 if (affinity)
481 mutex_unlock(&gang->aff_mutex);
482 if (ret && gang)
483 gang->alive--; // can't reach 0
484 return ret;
485 }
486
487 static int
spufs_mkgang(struct inode * dir,struct dentry * dentry,umode_t mode)488 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
489 {
490 int ret;
491 struct inode *inode;
492 struct spu_gang *gang;
493
494 ret = -ENOSPC;
495 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
496 if (!inode)
497 goto out;
498
499 ret = 0;
500 inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR);
501 gang = alloc_spu_gang();
502 SPUFS_I(inode)->i_ctx = NULL;
503 SPUFS_I(inode)->i_gang = gang;
504 if (!gang) {
505 ret = -ENOMEM;
506 goto out_iput;
507 }
508
509 inode->i_op = &simple_dir_inode_operations;
510 inode->i_fop = &simple_dir_operations;
511
512 d_instantiate(dentry, inode);
513 dget(dentry);
514 inc_nlink(dir);
515 inc_nlink(d_inode(dentry));
516 return ret;
517
518 out_iput:
519 iput(inode);
520 out:
521 return ret;
522 }
523
spufs_gang_close(struct inode * inode,struct file * file)524 static int spufs_gang_close(struct inode *inode, struct file *file)
525 {
526 unuse_gang(file->f_path.dentry);
527 return dcache_dir_close(inode, file);
528 }
529
530 static const struct file_operations spufs_gang_fops = {
531 .open = dcache_dir_open,
532 .release = spufs_gang_close,
533 .llseek = dcache_dir_lseek,
534 .read = generic_read_dir,
535 .iterate_shared = dcache_readdir,
536 .fsync = noop_fsync,
537 };
538
spufs_gang_open(const struct path * path)539 static int spufs_gang_open(const struct path *path)
540 {
541 int ret;
542 struct file *filp;
543
544 ret = get_unused_fd_flags(0);
545 if (ret < 0)
546 return ret;
547
548 /*
549 * get references for dget and mntget, will be released
550 * in error path of *_open().
551 */
552 filp = dentry_open(path, O_RDONLY, current_cred());
553 if (IS_ERR(filp)) {
554 put_unused_fd(ret);
555 return PTR_ERR(filp);
556 }
557
558 filp->f_op = &spufs_gang_fops;
559 fd_install(ret, filp);
560 return ret;
561 }
562
spufs_create_gang(struct inode * inode,struct dentry * dentry,struct vfsmount * mnt,umode_t mode)563 static int spufs_create_gang(struct inode *inode,
564 struct dentry *dentry,
565 struct vfsmount *mnt, umode_t mode)
566 {
567 struct path path = {.mnt = mnt, .dentry = dentry};
568 int ret;
569
570 ret = spufs_mkgang(inode, dentry, mode & 0777);
571 if (!ret) {
572 ret = spufs_gang_open(&path);
573 if (ret < 0)
574 unuse_gang(dentry);
575 }
576 return ret;
577 }
578
579
580 static struct file_system_type spufs_type;
581
spufs_create(const struct path * path,struct dentry * dentry,unsigned int flags,umode_t mode,struct file * filp)582 long spufs_create(const struct path *path, struct dentry *dentry,
583 unsigned int flags, umode_t mode, struct file *filp)
584 {
585 struct inode *dir = d_inode(path->dentry);
586 int ret;
587
588 /* check if we are on spufs */
589 if (path->dentry->d_sb->s_type != &spufs_type)
590 return -EINVAL;
591
592 /* don't accept undefined flags */
593 if (flags & (~SPU_CREATE_FLAG_ALL))
594 return -EINVAL;
595
596 /* only threads can be underneath a gang */
597 if (path->dentry != path->dentry->d_sb->s_root)
598 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
599 return -EINVAL;
600
601 mode &= ~current_umask();
602
603 if (flags & SPU_CREATE_GANG)
604 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
605 else
606 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
607 filp);
608 if (ret >= 0)
609 fsnotify_mkdir(dir, dentry);
610
611 return ret;
612 }
613
614 /* File system initialization */
615 struct spufs_fs_context {
616 kuid_t uid;
617 kgid_t gid;
618 umode_t mode;
619 };
620
621 enum {
622 Opt_uid, Opt_gid, Opt_mode, Opt_debug,
623 };
624
625 static const struct fs_parameter_spec spufs_fs_parameters[] = {
626 fsparam_u32 ("gid", Opt_gid),
627 fsparam_u32oct ("mode", Opt_mode),
628 fsparam_u32 ("uid", Opt_uid),
629 fsparam_flag ("debug", Opt_debug),
630 {}
631 };
632
spufs_show_options(struct seq_file * m,struct dentry * root)633 static int spufs_show_options(struct seq_file *m, struct dentry *root)
634 {
635 struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
636 struct inode *inode = root->d_inode;
637
638 if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
639 seq_printf(m, ",uid=%u",
640 from_kuid_munged(&init_user_ns, inode->i_uid));
641 if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
642 seq_printf(m, ",gid=%u",
643 from_kgid_munged(&init_user_ns, inode->i_gid));
644 if ((inode->i_mode & S_IALLUGO) != 0775)
645 seq_printf(m, ",mode=%o", inode->i_mode);
646 if (sbi->debug)
647 seq_puts(m, ",debug");
648 return 0;
649 }
650
spufs_parse_param(struct fs_context * fc,struct fs_parameter * param)651 static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
652 {
653 struct spufs_fs_context *ctx = fc->fs_private;
654 struct spufs_sb_info *sbi = fc->s_fs_info;
655 struct fs_parse_result result;
656 kuid_t uid;
657 kgid_t gid;
658 int opt;
659
660 opt = fs_parse(fc, spufs_fs_parameters, param, &result);
661 if (opt < 0)
662 return opt;
663
664 switch (opt) {
665 case Opt_uid:
666 uid = make_kuid(current_user_ns(), result.uint_32);
667 if (!uid_valid(uid))
668 return invalf(fc, "Unknown uid");
669 ctx->uid = uid;
670 break;
671 case Opt_gid:
672 gid = make_kgid(current_user_ns(), result.uint_32);
673 if (!gid_valid(gid))
674 return invalf(fc, "Unknown gid");
675 ctx->gid = gid;
676 break;
677 case Opt_mode:
678 ctx->mode = result.uint_32 & S_IALLUGO;
679 break;
680 case Opt_debug:
681 sbi->debug = true;
682 break;
683 }
684
685 return 0;
686 }
687
spufs_exit_isolated_loader(void)688 static void spufs_exit_isolated_loader(void)
689 {
690 free_pages((unsigned long) isolated_loader,
691 get_order(isolated_loader_size));
692 }
693
694 static void __init
spufs_init_isolated_loader(void)695 spufs_init_isolated_loader(void)
696 {
697 struct device_node *dn;
698 const char *loader;
699 int size;
700
701 dn = of_find_node_by_path("/spu-isolation");
702 if (!dn)
703 return;
704
705 loader = of_get_property(dn, "loader", &size);
706 of_node_put(dn);
707 if (!loader)
708 return;
709
710 /* the loader must be align on a 16 byte boundary */
711 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
712 if (!isolated_loader)
713 return;
714
715 isolated_loader_size = size;
716 memcpy(isolated_loader, loader, size);
717 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
718 }
719
spufs_create_root(struct super_block * sb,struct fs_context * fc)720 static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
721 {
722 struct spufs_fs_context *ctx = fc->fs_private;
723 struct inode *inode;
724
725 if (!spu_management_ops)
726 return -ENODEV;
727
728 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
729 if (!inode)
730 return -ENOMEM;
731
732 inode->i_uid = ctx->uid;
733 inode->i_gid = ctx->gid;
734 inode->i_op = &simple_dir_inode_operations;
735 inode->i_fop = &simple_dir_operations;
736 SPUFS_I(inode)->i_ctx = NULL;
737 inc_nlink(inode);
738
739 sb->s_root = d_make_root(inode);
740 if (!sb->s_root)
741 return -ENOMEM;
742 return 0;
743 }
744
745 static const struct super_operations spufs_ops = {
746 .alloc_inode = spufs_alloc_inode,
747 .free_inode = spufs_free_inode,
748 .statfs = simple_statfs,
749 .evict_inode = spufs_evict_inode,
750 .show_options = spufs_show_options,
751 };
752
spufs_fill_super(struct super_block * sb,struct fs_context * fc)753 static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
754 {
755 sb->s_maxbytes = MAX_LFS_FILESIZE;
756 sb->s_blocksize = PAGE_SIZE;
757 sb->s_blocksize_bits = PAGE_SHIFT;
758 sb->s_magic = SPUFS_MAGIC;
759 sb->s_op = &spufs_ops;
760
761 return spufs_create_root(sb, fc);
762 }
763
spufs_get_tree(struct fs_context * fc)764 static int spufs_get_tree(struct fs_context *fc)
765 {
766 return get_tree_single(fc, spufs_fill_super);
767 }
768
spufs_free_fc(struct fs_context * fc)769 static void spufs_free_fc(struct fs_context *fc)
770 {
771 kfree(fc->s_fs_info);
772 }
773
774 static const struct fs_context_operations spufs_context_ops = {
775 .free = spufs_free_fc,
776 .parse_param = spufs_parse_param,
777 .get_tree = spufs_get_tree,
778 };
779
spufs_init_fs_context(struct fs_context * fc)780 static int spufs_init_fs_context(struct fs_context *fc)
781 {
782 struct spufs_fs_context *ctx;
783 struct spufs_sb_info *sbi;
784
785 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
786 if (!ctx)
787 goto nomem;
788
789 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
790 if (!sbi)
791 goto nomem_ctx;
792
793 ctx->uid = current_uid();
794 ctx->gid = current_gid();
795 ctx->mode = 0755;
796
797 fc->fs_private = ctx;
798 fc->s_fs_info = sbi;
799 fc->ops = &spufs_context_ops;
800 return 0;
801
802 nomem_ctx:
803 kfree(ctx);
804 nomem:
805 return -ENOMEM;
806 }
807
808 static struct file_system_type spufs_type = {
809 .owner = THIS_MODULE,
810 .name = "spufs",
811 .init_fs_context = spufs_init_fs_context,
812 .parameters = spufs_fs_parameters,
813 .kill_sb = kill_litter_super,
814 };
815 MODULE_ALIAS_FS("spufs");
816
spufs_init(void)817 static int __init spufs_init(void)
818 {
819 int ret;
820
821 ret = -ENODEV;
822 if (!spu_management_ops)
823 goto out;
824
825 ret = -ENOMEM;
826 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
827 sizeof(struct spufs_inode_info), 0,
828 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
829
830 if (!spufs_inode_cache)
831 goto out;
832 ret = spu_sched_init();
833 if (ret)
834 goto out_cache;
835 ret = register_spu_syscalls(&spufs_calls);
836 if (ret)
837 goto out_sched;
838 ret = register_filesystem(&spufs_type);
839 if (ret)
840 goto out_syscalls;
841
842 spufs_init_isolated_loader();
843
844 return 0;
845
846 out_syscalls:
847 unregister_spu_syscalls(&spufs_calls);
848 out_sched:
849 spu_sched_exit();
850 out_cache:
851 kmem_cache_destroy(spufs_inode_cache);
852 out:
853 return ret;
854 }
855 module_init(spufs_init);
856
spufs_exit(void)857 static void __exit spufs_exit(void)
858 {
859 spu_sched_exit();
860 spufs_exit_isolated_loader();
861 unregister_spu_syscalls(&spufs_calls);
862 unregister_filesystem(&spufs_type);
863 kmem_cache_destroy(spufs_inode_cache);
864 }
865 module_exit(spufs_exit);
866
867 MODULE_LICENSE("GPL");
868 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
869
870