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 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 * 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 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 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 * 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 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 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 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 } 145 146 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 */ 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 } 183 184 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 dput(dentry); 197 return ret; 198 } 199 files++; 200 } 201 return 0; 202 } 203 204 static 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 } 220 221 static 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(dir->d_parent); 229 230 inode_lock_nested(parent, I_MUTEX_PARENT); 231 ret = spufs_rmdir(parent, dir); 232 inode_unlock(parent); 233 WARN_ON(ret); 234 235 unuse_gang(dir->d_parent); 236 return dcache_dir_close(inode, file); 237 } 238 239 const 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 }; 247 EXPORT_SYMBOL_GPL(spufs_context_fops); 248 249 static int 250 spufs_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(dir->i_sb, mode | S_IFDIR); 258 if (!inode) 259 return -ENOSPC; 260 261 inode_init_owner(&nop_mnt_idmap, inode, dir, 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(dir); 277 inc_nlink(inode); 278 279 d_instantiate(dentry, inode); 280 281 if (flags & SPU_CREATE_NOSCHED) 282 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents, 283 mode, ctx); 284 else 285 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx); 286 287 if (!ret && spufs_get_sb_info(dir->i_sb)->debug) 288 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents, 289 mode, ctx); 290 291 if (ret) 292 spufs_rmdir(dir, dentry); 293 294 inode_unlock(inode); 295 296 return ret; 297 } 298 299 static int spufs_context_open(const struct path *path) 300 { 301 int ret; 302 struct file *filp; 303 304 ret = get_unused_fd_flags(0); 305 if (ret < 0) 306 return ret; 307 308 filp = dentry_open(path, O_RDONLY, current_cred()); 309 if (IS_ERR(filp)) { 310 put_unused_fd(ret); 311 return PTR_ERR(filp); 312 } 313 314 filp->f_op = &spufs_context_fops; 315 fd_install(ret, filp); 316 return ret; 317 } 318 319 static struct spu_context * 320 spufs_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(&(list_entry(cbe_spu_info[0].spus.next, 328 struct spu, cbe_list))->aff_list); 329 330 if (!aff_supp) 331 return ERR_PTR(-EINVAL); 332 333 if (flags & SPU_CREATE_GANG) 334 return ERR_PTR(-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(-EEXIST); 340 341 if (gang->aff_flags & AFF_MERGED) 342 return ERR_PTR(-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(-EINVAL); 348 349 neighbor = get_spu_context( 350 SPUFS_I(file_inode(filp))->i_ctx); 351 352 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) && 353 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) && 354 !list_entry(neighbor->aff_list.next, struct spu_context, 355 aff_list)->aff_head) { 356 err = ERR_PTR(-EEXIST); 357 goto out_put_neighbor; 358 } 359 360 if (gang != neighbor->gang) { 361 err = ERR_PTR(-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(&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(-EEXIST); 379 goto out_put_neighbor; 380 } 381 } 382 383 return neighbor; 384 385 out_put_neighbor: 386 put_spu_context(neighbor); 387 return err; 388 } 389 390 static void 391 spufs_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(&neighbor->aff_list)) { 399 list_add_tail(&neighbor->aff_list, 400 &ctx->gang->aff_list_head); 401 neighbor->aff_head = 1; 402 } 403 404 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head) 405 || list_entry(neighbor->aff_list.next, struct spu_context, 406 aff_list)->aff_head) { 407 list_add(&ctx->aff_list, &neighbor->aff_list); 408 } else { 409 list_add_tail(&ctx->aff_list, &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 } 420 421 static int 422 spufs_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, aff_filp); 456 if (IS_ERR(neighbor)) { 457 ret = PTR_ERR(neighbor); 458 goto out_aff_unlock; 459 } 460 } 461 462 ret = spufs_mkdir(inode, dentry, flags, mode & 0777); 463 if (ret) { 464 if (neighbor) 465 put_spu_context(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(neighbor); 474 } 475 476 ret = spufs_context_open(&path); 477 if (ret < 0) 478 WARN_ON(spufs_rmdir(inode, dentry)); 479 480 out_aff_unlock: 481 if (affinity) 482 mutex_unlock(&gang->aff_mutex); 483 if (ret && gang) 484 gang->alive--; // can't reach 0 485 return ret; 486 } 487 488 static int 489 spufs_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(dir->i_sb, mode | S_IFDIR); 497 if (!inode) 498 goto out; 499 500 ret = 0; 501 inode_init_owner(&nop_mnt_idmap, inode, dir, 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(dir); 516 inc_nlink(d_inode(dentry)); 517 return ret; 518 519 out_iput: 520 iput(inode); 521 out: 522 return ret; 523 } 524 525 static int spufs_gang_close(struct inode *inode, struct file *file) 526 { 527 unuse_gang(file->f_path.dentry); 528 return dcache_dir_close(inode, file); 529 } 530 531 static 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 }; 539 540 static int spufs_gang_open(const struct path *path) 541 { 542 int ret; 543 struct file *filp; 544 545 ret = get_unused_fd_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(filp)) { 555 put_unused_fd(ret); 556 return PTR_ERR(filp); 557 } 558 559 filp->f_op = &spufs_gang_fops; 560 fd_install(ret, filp); 561 return ret; 562 } 563 564 static 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(inode, dentry, mode & 0777); 572 if (!ret) { 573 ret = spufs_gang_open(&path); 574 if (ret < 0) 575 unuse_gang(dentry); 576 } 577 return ret; 578 } 579 580 581 static struct file_system_type spufs_type; 582 583 long 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(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(dir, dentry, path->mnt, mode); 606 else 607 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode, 608 filp); 609 if (ret >= 0) 610 fsnotify_mkdir(dir, dentry); 611 612 return ret; 613 } 614 615 /* File system initialization */ 616 struct spufs_fs_context { 617 kuid_t uid; 618 kgid_t gid; 619 umode_t mode; 620 }; 621 622 enum { 623 Opt_uid, Opt_gid, Opt_mode, Opt_debug, 624 }; 625 626 static 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 }; 633 634 static int spufs_show_options(struct seq_file *m, struct dentry *root) 635 { 636 struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb); 637 struct inode *inode = root->d_inode; 638 639 if (!uid_eq(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 } 651 652 static 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, spufs_fs_parameters, param, &result); 662 if (opt < 0) 663 return opt; 664 665 switch (opt) { 666 case Opt_uid: 667 uid = make_kuid(current_user_ns(), 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(), 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 } 688 689 static void spufs_exit_isolated_loader(void) 690 { 691 free_pages((unsigned long) isolated_loader, 692 get_order(isolated_loader_size)); 693 } 694 695 static void __init 696 spufs_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("/spu-isolation"); 703 if (!dn) 704 return; 705 706 loader = of_get_property(dn, "loader", &size); 707 of_node_put(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 } 720 721 static 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 } 745 746 static 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 }; 753 754 static 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 } 764 765 static int spufs_get_tree(struct fs_context *fc) 766 { 767 return get_tree_single(fc, spufs_fill_super); 768 } 769 770 static void spufs_free_fc(struct fs_context *fc) 771 { 772 kfree(fc->s_fs_info); 773 } 774 775 static 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 }; 780 781 static 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; 802 803 nomem_ctx: 804 kfree(ctx); 805 nomem: 806 return -ENOMEM; 807 } 808 809 static 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 }; 816 MODULE_ALIAS_FS("spufs"); 817 818 static 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; 846 847 out_syscalls: 848 unregister_spu_syscalls(&spufs_calls); 849 out_sched: 850 spu_sched_exit(); 851 out_cache: 852 kmem_cache_destroy(spufs_inode_cache); 853 out: 854 return ret; 855 } 856 module_init(spufs_init); 857 858 static 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(spufs_inode_cache); 865 } 866 module_exit(spufs_exit); 867 868 MODULE_DESCRIPTION("SPU file system"); 869 MODULE_LICENSE("GPL"); 870 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); 871 872