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
34struct spufs_sb_info {
35 bool debug;
36};
37
38static struct kmem_cache *spufs_inode_cache;
39char *isolated_loader;
40static int isolated_loader_size;
41
42static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
43{
44 return sb->s_fs_info;
45}
46
47static struct inode *
48spufs_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
63static void spufs_free_inode(struct inode *inode)
64{
65 kmem_cache_free(s: spufs_inode_cache, SPUFS_I(inode));
66}
67
68static void
69spufs_init_once(void *p)
70{
71 struct spufs_inode_info *ei = p;
72
73 inode_init_once(&ei->vfs_inode);
74}
75
76static struct inode *
77spufs_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);
90out:
91 return inode;
92}
93
94static int
95spufs_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
109static int
110spufs_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);
131out:
132 return ret;
133}
134
135static void
136spufs_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(ctx: ei->i_ctx);
142 if (ei->i_gang)
143 put_spu_gang(gang: ei->i_gang);
144}
145
146static void spufs_prune_dir(struct dentry *dir)
147{
148 struct dentry *dentry;
149 struct hlist_node *n;
150
151 inode_lock(inode: d_inode(dentry: dir));
152 hlist_for_each_entry_safe(dentry, n, &dir->d_children, d_sib) {
153 spin_lock(lock: &dentry->d_lock);
154 if (simple_positive(dentry)) {
155 dget_dlock(dentry);
156 __d_drop(dentry);
157 spin_unlock(lock: &dentry->d_lock);
158 simple_unlink(d_inode(dentry: 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(lock: &dentry->d_lock);
165 }
166 }
167 shrink_dcache_parent(dir);
168 inode_unlock(inode: d_inode(dentry: dir));
169}
170
171/* Caller must hold parent->i_mutex */
172static 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(dentry: 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
184static 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(sb: dir->d_sb, dentry, fops: files->ops,
194 mode: files->mode & mode, size: files->size, ctx);
195 if (ret) {
196 dput(dentry);
197 return ret;
198 }
199 files++;
200 }
201 return 0;
202}
203
204static void unuse_gang(struct dentry *dir)
205{
206 struct inode *inode = dir->d_inode;
207 struct spu_gang *gang = SPUFS_I(inode)->i_gang;
208
209 if (gang) {
210 bool dead;
211
212 inode_lock(inode); // exclusion with spufs_create_context()
213 dead = !--gang->alive;
214 inode_unlock(inode);
215
216 if (dead)
217 simple_recursive_removal(dir, NULL);
218 }
219}
220
221static int spufs_dir_close(struct inode *inode, struct file *file)
222{
223 struct inode *parent;
224 struct dentry *dir;
225 int ret;
226
227 dir = file->f_path.dentry;
228 parent = d_inode(dentry: dir->d_parent);
229
230 inode_lock_nested(inode: parent, subclass: I_MUTEX_PARENT);
231 ret = spufs_rmdir(parent, dir);
232 inode_unlock(inode: parent);
233 WARN_ON(ret);
234
235 unuse_gang(dir: dir->d_parent);
236 return dcache_dir_close(inode, file);
237}
238
239const struct file_operations spufs_context_fops = {
240 .open = dcache_dir_open,
241 .release = spufs_dir_close,
242 .llseek = dcache_dir_lseek,
243 .read = generic_read_dir,
244 .iterate_shared = dcache_readdir,
245 .fsync = noop_fsync,
246};
247EXPORT_SYMBOL_GPL(spufs_context_fops);
248
249static int
250spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
251 umode_t mode)
252{
253 int ret;
254 struct inode *inode;
255 struct spu_context *ctx;
256
257 inode = spufs_new_inode(sb: dir->i_sb, mode: mode | S_IFDIR);
258 if (!inode)
259 return -ENOSPC;
260
261 inode_init_owner(idmap: &nop_mnt_idmap, inode, dir, mode: mode | S_IFDIR);
262 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
263 SPUFS_I(inode)->i_ctx = ctx;
264 if (!ctx) {
265 iput(inode);
266 return -ENOSPC;
267 }
268
269 ctx->flags = flags;
270 inode->i_op = &simple_dir_inode_operations;
271 inode->i_fop = &simple_dir_operations;
272
273 inode_lock(inode);
274
275 dget(dentry);
276 inc_nlink(inode: dir);
277 inc_nlink(inode);
278
279 d_instantiate(dentry, inode);
280
281 if (flags & SPU_CREATE_NOSCHED)
282 ret = spufs_fill_dir(dir: dentry, files: spufs_dir_nosched_contents,
283 mode, ctx);
284 else
285 ret = spufs_fill_dir(dir: dentry, files: spufs_dir_contents, mode, ctx);
286
287 if (!ret && spufs_get_sb_info(sb: dir->i_sb)->debug)
288 ret = spufs_fill_dir(dir: dentry, files: spufs_dir_debug_contents,
289 mode, ctx);
290
291 if (ret)
292 spufs_rmdir(parent: dir, dir: dentry);
293
294 inode_unlock(inode);
295
296 return ret;
297}
298
299static int spufs_context_open(const struct path *path)
300{
301 int ret;
302 struct file *filp;
303
304 ret = get_unused_fd_flags(flags: 0);
305 if (ret < 0)
306 return ret;
307
308 filp = dentry_open(path, O_RDONLY, current_cred());
309 if (IS_ERR(ptr: filp)) {
310 put_unused_fd(fd: ret);
311 return PTR_ERR(ptr: filp);
312 }
313
314 filp->f_op = &spufs_context_fops;
315 fd_install(fd: ret, file: filp);
316 return ret;
317}
318
319static struct spu_context *
320spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
321 struct file *filp)
322{
323 struct spu_context *tmp, *neighbor, *err;
324 int count, node;
325 int aff_supp;
326
327 aff_supp = !list_empty(head: &(list_entry(cbe_spu_info[0].spus.next,
328 struct spu, cbe_list))->aff_list);
329
330 if (!aff_supp)
331 return ERR_PTR(error: -EINVAL);
332
333 if (flags & SPU_CREATE_GANG)
334 return ERR_PTR(error: -EINVAL);
335
336 if (flags & SPU_CREATE_AFFINITY_MEM &&
337 gang->aff_ref_ctx &&
338 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
339 return ERR_PTR(error: -EEXIST);
340
341 if (gang->aff_flags & AFF_MERGED)
342 return ERR_PTR(error: -EBUSY);
343
344 neighbor = NULL;
345 if (flags & SPU_CREATE_AFFINITY_SPU) {
346 if (!filp || filp->f_op != &spufs_context_fops)
347 return ERR_PTR(error: -EINVAL);
348
349 neighbor = get_spu_context(
350 SPUFS_I(file_inode(filp))->i_ctx);
351
352 if (!list_empty(head: &neighbor->aff_list) && !(neighbor->aff_head) &&
353 !list_is_last(list: &neighbor->aff_list, head: &gang->aff_list_head) &&
354 !list_entry(neighbor->aff_list.next, struct spu_context,
355 aff_list)->aff_head) {
356 err = ERR_PTR(error: -EEXIST);
357 goto out_put_neighbor;
358 }
359
360 if (gang != neighbor->gang) {
361 err = ERR_PTR(error: -EINVAL);
362 goto out_put_neighbor;
363 }
364
365 count = 1;
366 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
367 count++;
368 if (list_empty(head: &neighbor->aff_list))
369 count++;
370
371 for (node = 0; node < MAX_NUMNODES; node++) {
372 if ((cbe_spu_info[node].n_spus - atomic_read(
373 &cbe_spu_info[node].reserved_spus)) >= count)
374 break;
375 }
376
377 if (node == MAX_NUMNODES) {
378 err = ERR_PTR(error: -EEXIST);
379 goto out_put_neighbor;
380 }
381 }
382
383 return neighbor;
384
385out_put_neighbor:
386 put_spu_context(ctx: neighbor);
387 return err;
388}
389
390static void
391spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
392 struct spu_context *neighbor)
393{
394 if (flags & SPU_CREATE_AFFINITY_MEM)
395 ctx->gang->aff_ref_ctx = ctx;
396
397 if (flags & SPU_CREATE_AFFINITY_SPU) {
398 if (list_empty(head: &neighbor->aff_list)) {
399 list_add_tail(new: &neighbor->aff_list,
400 head: &ctx->gang->aff_list_head);
401 neighbor->aff_head = 1;
402 }
403
404 if (list_is_last(list: &neighbor->aff_list, head: &ctx->gang->aff_list_head)
405 || list_entry(neighbor->aff_list.next, struct spu_context,
406 aff_list)->aff_head) {
407 list_add(new: &ctx->aff_list, head: &neighbor->aff_list);
408 } else {
409 list_add_tail(new: &ctx->aff_list, head: &neighbor->aff_list);
410 if (neighbor->aff_head) {
411 neighbor->aff_head = 0;
412 ctx->aff_head = 1;
413 }
414 }
415
416 if (!ctx->gang->aff_ref_ctx)
417 ctx->gang->aff_ref_ctx = ctx;
418 }
419}
420
421static int
422spufs_create_context(struct inode *inode, struct dentry *dentry,
423 struct vfsmount *mnt, int flags, umode_t mode,
424 struct file *aff_filp)
425{
426 int ret;
427 int affinity;
428 struct spu_gang *gang = SPUFS_I(inode)->i_gang;
429 struct spu_context *neighbor;
430 struct path path = {.mnt = mnt, .dentry = dentry};
431
432 if ((flags & SPU_CREATE_NOSCHED) &&
433 !capable(CAP_SYS_NICE))
434 return -EPERM;
435
436 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
437 == SPU_CREATE_ISOLATE)
438 return -EINVAL;
439
440 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
441 return -ENODEV;
442
443 if (gang) {
444 if (!gang->alive)
445 return -ENOENT;
446 gang->alive++;
447 }
448
449 neighbor = NULL;
450 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
451 if (affinity) {
452 if (!gang)
453 return -EINVAL;
454 mutex_lock(&gang->aff_mutex);
455 neighbor = spufs_assert_affinity(flags, gang, filp: aff_filp);
456 if (IS_ERR(ptr: neighbor)) {
457 ret = PTR_ERR(ptr: neighbor);
458 goto out_aff_unlock;
459 }
460 }
461
462 ret = spufs_mkdir(dir: inode, dentry, flags, mode: mode & 0777);
463 if (ret) {
464 if (neighbor)
465 put_spu_context(ctx: neighbor);
466 goto out_aff_unlock;
467 }
468
469 if (affinity) {
470 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
471 neighbor);
472 if (neighbor)
473 put_spu_context(ctx: neighbor);
474 }
475
476 ret = spufs_context_open(path: &path);
477 if (ret < 0)
478 WARN_ON(spufs_rmdir(inode, dentry));
479
480out_aff_unlock:
481 if (affinity)
482 mutex_unlock(lock: &gang->aff_mutex);
483 if (ret && gang)
484 gang->alive--; // can't reach 0
485 return ret;
486}
487
488static int
489spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
490{
491 int ret;
492 struct inode *inode;
493 struct spu_gang *gang;
494
495 ret = -ENOSPC;
496 inode = spufs_new_inode(sb: dir->i_sb, mode: mode | S_IFDIR);
497 if (!inode)
498 goto out;
499
500 ret = 0;
501 inode_init_owner(idmap: &nop_mnt_idmap, inode, dir, mode: mode | S_IFDIR);
502 gang = alloc_spu_gang();
503 SPUFS_I(inode)->i_ctx = NULL;
504 SPUFS_I(inode)->i_gang = gang;
505 if (!gang) {
506 ret = -ENOMEM;
507 goto out_iput;
508 }
509
510 inode->i_op = &simple_dir_inode_operations;
511 inode->i_fop = &simple_dir_operations;
512
513 d_instantiate(dentry, inode);
514 dget(dentry);
515 inc_nlink(inode: dir);
516 inc_nlink(inode: d_inode(dentry));
517 return ret;
518
519out_iput:
520 iput(inode);
521out:
522 return ret;
523}
524
525static int spufs_gang_close(struct inode *inode, struct file *file)
526{
527 unuse_gang(dir: file->f_path.dentry);
528 return dcache_dir_close(inode, file);
529}
530
531static const struct file_operations spufs_gang_fops = {
532 .open = dcache_dir_open,
533 .release = spufs_gang_close,
534 .llseek = dcache_dir_lseek,
535 .read = generic_read_dir,
536 .iterate_shared = dcache_readdir,
537 .fsync = noop_fsync,
538};
539
540static int spufs_gang_open(const struct path *path)
541{
542 int ret;
543 struct file *filp;
544
545 ret = get_unused_fd_flags(flags: 0);
546 if (ret < 0)
547 return ret;
548
549 /*
550 * get references for dget and mntget, will be released
551 * in error path of *_open().
552 */
553 filp = dentry_open(path, O_RDONLY, current_cred());
554 if (IS_ERR(ptr: filp)) {
555 put_unused_fd(fd: ret);
556 return PTR_ERR(ptr: filp);
557 }
558
559 filp->f_op = &spufs_gang_fops;
560 fd_install(fd: ret, file: filp);
561 return ret;
562}
563
564static int spufs_create_gang(struct inode *inode,
565 struct dentry *dentry,
566 struct vfsmount *mnt, umode_t mode)
567{
568 struct path path = {.mnt = mnt, .dentry = dentry};
569 int ret;
570
571 ret = spufs_mkgang(dir: inode, dentry, mode: mode & 0777);
572 if (!ret) {
573 ret = spufs_gang_open(path: &path);
574 if (ret < 0)
575 unuse_gang(dir: dentry);
576 }
577 return ret;
578}
579
580
581static struct file_system_type spufs_type;
582
583long spufs_create(const struct path *path, struct dentry *dentry,
584 unsigned int flags, umode_t mode, struct file *filp)
585{
586 struct inode *dir = d_inode(dentry: path->dentry);
587 int ret;
588
589 /* check if we are on spufs */
590 if (path->dentry->d_sb->s_type != &spufs_type)
591 return -EINVAL;
592
593 /* don't accept undefined flags */
594 if (flags & (~SPU_CREATE_FLAG_ALL))
595 return -EINVAL;
596
597 /* only threads can be underneath a gang */
598 if (path->dentry != path->dentry->d_sb->s_root)
599 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
600 return -EINVAL;
601
602 mode &= ~current_umask();
603
604 if (flags & SPU_CREATE_GANG)
605 ret = spufs_create_gang(inode: dir, dentry, mnt: path->mnt, mode);
606 else
607 ret = spufs_create_context(inode: dir, dentry, mnt: path->mnt, flags, mode,
608 aff_filp: filp);
609 if (ret >= 0)
610 fsnotify_mkdir(dir, dentry);
611
612 return ret;
613}
614
615/* File system initialization */
616struct spufs_fs_context {
617 kuid_t uid;
618 kgid_t gid;
619 umode_t mode;
620};
621
622enum {
623 Opt_uid, Opt_gid, Opt_mode, Opt_debug,
624};
625
626static const struct fs_parameter_spec spufs_fs_parameters[] = {
627 fsparam_u32 ("gid", Opt_gid),
628 fsparam_u32oct ("mode", Opt_mode),
629 fsparam_u32 ("uid", Opt_uid),
630 fsparam_flag ("debug", Opt_debug),
631 {}
632};
633
634static int spufs_show_options(struct seq_file *m, struct dentry *root)
635{
636 struct spufs_sb_info *sbi = spufs_get_sb_info(sb: root->d_sb);
637 struct inode *inode = root->d_inode;
638
639 if (!uid_eq(left: inode->i_uid, GLOBAL_ROOT_UID))
640 seq_printf(m, ",uid=%u",
641 from_kuid_munged(&init_user_ns, inode->i_uid));
642 if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
643 seq_printf(m, ",gid=%u",
644 from_kgid_munged(&init_user_ns, inode->i_gid));
645 if ((inode->i_mode & S_IALLUGO) != 0775)
646 seq_printf(m, ",mode=%o", inode->i_mode);
647 if (sbi->debug)
648 seq_puts(m, ",debug");
649 return 0;
650}
651
652static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
653{
654 struct spufs_fs_context *ctx = fc->fs_private;
655 struct spufs_sb_info *sbi = fc->s_fs_info;
656 struct fs_parse_result result;
657 kuid_t uid;
658 kgid_t gid;
659 int opt;
660
661 opt = fs_parse(fc, desc: spufs_fs_parameters, param, result: &result);
662 if (opt < 0)
663 return opt;
664
665 switch (opt) {
666 case Opt_uid:
667 uid = make_kuid(current_user_ns(), uid: result.uint_32);
668 if (!uid_valid(uid))
669 return invalf(fc, "Unknown uid");
670 ctx->uid = uid;
671 break;
672 case Opt_gid:
673 gid = make_kgid(current_user_ns(), gid: result.uint_32);
674 if (!gid_valid(gid))
675 return invalf(fc, "Unknown gid");
676 ctx->gid = gid;
677 break;
678 case Opt_mode:
679 ctx->mode = result.uint_32 & S_IALLUGO;
680 break;
681 case Opt_debug:
682 sbi->debug = true;
683 break;
684 }
685
686 return 0;
687}
688
689static void spufs_exit_isolated_loader(void)
690{
691 free_pages(addr: (unsigned long) isolated_loader,
692 order: get_order(size: isolated_loader_size));
693}
694
695static void __init
696spufs_init_isolated_loader(void)
697{
698 struct device_node *dn;
699 const char *loader;
700 int size;
701
702 dn = of_find_node_by_path(path: "/spu-isolation");
703 if (!dn)
704 return;
705
706 loader = of_get_property(node: dn, name: "loader", lenp: &size);
707 of_node_put(node: dn);
708 if (!loader)
709 return;
710
711 /* the loader must be align on a 16 byte boundary */
712 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
713 if (!isolated_loader)
714 return;
715
716 isolated_loader_size = size;
717 memcpy(isolated_loader, loader, size);
718 printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
719}
720
721static int spufs_create_root(struct super_block *sb, struct fs_context *fc)
722{
723 struct spufs_fs_context *ctx = fc->fs_private;
724 struct inode *inode;
725
726 if (!spu_management_ops)
727 return -ENODEV;
728
729 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
730 if (!inode)
731 return -ENOMEM;
732
733 inode->i_uid = ctx->uid;
734 inode->i_gid = ctx->gid;
735 inode->i_op = &simple_dir_inode_operations;
736 inode->i_fop = &simple_dir_operations;
737 SPUFS_I(inode)->i_ctx = NULL;
738 inc_nlink(inode);
739
740 sb->s_root = d_make_root(inode);
741 if (!sb->s_root)
742 return -ENOMEM;
743 return 0;
744}
745
746static const struct super_operations spufs_ops = {
747 .alloc_inode = spufs_alloc_inode,
748 .free_inode = spufs_free_inode,
749 .statfs = simple_statfs,
750 .evict_inode = spufs_evict_inode,
751 .show_options = spufs_show_options,
752};
753
754static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
755{
756 sb->s_maxbytes = MAX_LFS_FILESIZE;
757 sb->s_blocksize = PAGE_SIZE;
758 sb->s_blocksize_bits = PAGE_SHIFT;
759 sb->s_magic = SPUFS_MAGIC;
760 sb->s_op = &spufs_ops;
761
762 return spufs_create_root(sb, fc);
763}
764
765static int spufs_get_tree(struct fs_context *fc)
766{
767 return get_tree_single(fc, fill_super: spufs_fill_super);
768}
769
770static void spufs_free_fc(struct fs_context *fc)
771{
772 kfree(objp: fc->s_fs_info);
773}
774
775static const struct fs_context_operations spufs_context_ops = {
776 .free = spufs_free_fc,
777 .parse_param = spufs_parse_param,
778 .get_tree = spufs_get_tree,
779};
780
781static int spufs_init_fs_context(struct fs_context *fc)
782{
783 struct spufs_fs_context *ctx;
784 struct spufs_sb_info *sbi;
785
786 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
787 if (!ctx)
788 goto nomem;
789
790 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
791 if (!sbi)
792 goto nomem_ctx;
793
794 ctx->uid = current_uid();
795 ctx->gid = current_gid();
796 ctx->mode = 0755;
797
798 fc->fs_private = ctx;
799 fc->s_fs_info = sbi;
800 fc->ops = &spufs_context_ops;
801 return 0;
802
803nomem_ctx:
804 kfree(objp: ctx);
805nomem:
806 return -ENOMEM;
807}
808
809static struct file_system_type spufs_type = {
810 .owner = THIS_MODULE,
811 .name = "spufs",
812 .init_fs_context = spufs_init_fs_context,
813 .parameters = spufs_fs_parameters,
814 .kill_sb = kill_litter_super,
815};
816MODULE_ALIAS_FS("spufs");
817
818static int __init spufs_init(void)
819{
820 int ret;
821
822 ret = -ENODEV;
823 if (!spu_management_ops)
824 goto out;
825
826 ret = -ENOMEM;
827 spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
828 sizeof(struct spufs_inode_info), 0,
829 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
830
831 if (!spufs_inode_cache)
832 goto out;
833 ret = spu_sched_init();
834 if (ret)
835 goto out_cache;
836 ret = register_spu_syscalls(&spufs_calls);
837 if (ret)
838 goto out_sched;
839 ret = register_filesystem(&spufs_type);
840 if (ret)
841 goto out_syscalls;
842
843 spufs_init_isolated_loader();
844
845 return 0;
846
847out_syscalls:
848 unregister_spu_syscalls(&spufs_calls);
849out_sched:
850 spu_sched_exit();
851out_cache:
852 kmem_cache_destroy(s: spufs_inode_cache);
853out:
854 return ret;
855}
856module_init(spufs_init);
857
858static void __exit spufs_exit(void)
859{
860 spu_sched_exit();
861 spufs_exit_isolated_loader();
862 unregister_spu_syscalls(&spufs_calls);
863 unregister_filesystem(&spufs_type);
864 kmem_cache_destroy(s: spufs_inode_cache);
865}
866module_exit(spufs_exit);
867
868MODULE_DESCRIPTION("SPU file system");
869MODULE_LICENSE("GPL");
870MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
871
872

source code of linux/arch/powerpc/platforms/cell/spufs/inode.c