1 2 /* 3 * SPU file system 4 * 5 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 6 * 7 * Author: Arnd Bergmann <arndb@de.ibm.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2, or (at your option) 12 * any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 */ 23 24 #include <linux/file.h> 25 #include <linux/fs.h> 26 #include <linux/fsnotify.h> 27 #include <linux/backing-dev.h> 28 #include <linux/init.h> 29 #include <linux/ioctl.h> 30 #include <linux/module.h> 31 #include <linux/mount.h> 32 #include <linux/namei.h> 33 #include <linux/pagemap.h> 34 #include <linux/poll.h> 35 #include <linux/slab.h> 36 #include <linux/parser.h> 37 38 #include <asm/prom.h> 39 #include <asm/spu.h> 40 #include <asm/spu_priv1.h> 41 #include <asm/uaccess.h> 42 43 #include "spufs.h" 44 45 struct spufs_sb_info { 46 int debug; 47 }; 48 49 static struct kmem_cache *spufs_inode_cache; 50 char *isolated_loader; 51 static int isolated_loader_size; 52 53 static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb) 54 { 55 return sb->s_fs_info; 56 } 57 58 static struct inode * 59 spufs_alloc_inode(struct super_block *sb) 60 { 61 struct spufs_inode_info *ei; 62 63 ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL); 64 if (!ei) 65 return NULL; 66 67 ei->i_gang = NULL; 68 ei->i_ctx = NULL; 69 ei->i_openers = 0; 70 71 return &ei->vfs_inode; 72 } 73 74 static void spufs_i_callback(struct rcu_head *head) 75 { 76 struct inode *inode = container_of(head, struct inode, i_rcu); 77 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode)); 78 } 79 80 static void spufs_destroy_inode(struct inode *inode) 81 { 82 call_rcu(&inode->i_rcu, spufs_i_callback); 83 } 84 85 static void 86 spufs_init_once(void *p) 87 { 88 struct spufs_inode_info *ei = p; 89 90 inode_init_once(&ei->vfs_inode); 91 } 92 93 static struct inode * 94 spufs_new_inode(struct super_block *sb, umode_t mode) 95 { 96 struct inode *inode; 97 98 inode = new_inode(sb); 99 if (!inode) 100 goto out; 101 102 inode->i_mode = mode; 103 inode->i_uid = current_fsuid(); 104 inode->i_gid = current_fsgid(); 105 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 106 out: 107 return inode; 108 } 109 110 static int 111 spufs_setattr(struct dentry *dentry, struct iattr *attr) 112 { 113 struct inode *inode = dentry->d_inode; 114 115 if ((attr->ia_valid & ATTR_SIZE) && 116 (attr->ia_size != inode->i_size)) 117 return -EINVAL; 118 setattr_copy(inode, attr); 119 mark_inode_dirty(inode); 120 return 0; 121 } 122 123 124 static int 125 spufs_new_file(struct super_block *sb, struct dentry *dentry, 126 const struct file_operations *fops, umode_t mode, 127 size_t size, struct spu_context *ctx) 128 { 129 static const struct inode_operations spufs_file_iops = { 130 .setattr = spufs_setattr, 131 }; 132 struct inode *inode; 133 int ret; 134 135 ret = -ENOSPC; 136 inode = spufs_new_inode(sb, S_IFREG | mode); 137 if (!inode) 138 goto out; 139 140 ret = 0; 141 inode->i_op = &spufs_file_iops; 142 inode->i_fop = fops; 143 inode->i_size = size; 144 inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx); 145 d_add(dentry, inode); 146 out: 147 return ret; 148 } 149 150 static void 151 spufs_evict_inode(struct inode *inode) 152 { 153 struct spufs_inode_info *ei = SPUFS_I(inode); 154 end_writeback(inode); 155 if (ei->i_ctx) 156 put_spu_context(ei->i_ctx); 157 if (ei->i_gang) 158 put_spu_gang(ei->i_gang); 159 } 160 161 static void spufs_prune_dir(struct dentry *dir) 162 { 163 struct dentry *dentry, *tmp; 164 165 mutex_lock(&dir->d_inode->i_mutex); 166 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { 167 spin_lock(&dentry->d_lock); 168 if (!(d_unhashed(dentry)) && dentry->d_inode) { 169 dget_dlock(dentry); 170 __d_drop(dentry); 171 spin_unlock(&dentry->d_lock); 172 simple_unlink(dir->d_inode, dentry); 173 /* XXX: what was dcache_lock protecting here? Other 174 * filesystems (IB, configfs) release dcache_lock 175 * before unlink */ 176 dput(dentry); 177 } else { 178 spin_unlock(&dentry->d_lock); 179 } 180 } 181 shrink_dcache_parent(dir); 182 mutex_unlock(&dir->d_inode->i_mutex); 183 } 184 185 /* Caller must hold parent->i_mutex */ 186 static int spufs_rmdir(struct inode *parent, struct dentry *dir) 187 { 188 /* remove all entries */ 189 spufs_prune_dir(dir); 190 d_drop(dir); 191 192 return simple_rmdir(parent, dir); 193 } 194 195 static int spufs_fill_dir(struct dentry *dir, 196 const struct spufs_tree_descr *files, umode_t mode, 197 struct spu_context *ctx) 198 { 199 struct dentry *dentry, *tmp; 200 int ret; 201 202 while (files->name && files->name[0]) { 203 ret = -ENOMEM; 204 dentry = d_alloc_name(dir, files->name); 205 if (!dentry) 206 goto out; 207 ret = spufs_new_file(dir->d_sb, dentry, files->ops, 208 files->mode & mode, files->size, ctx); 209 if (ret) 210 goto out; 211 files++; 212 } 213 return 0; 214 out: 215 /* 216 * remove all children from dir. dir->inode is not set so don't 217 * just simply use spufs_prune_dir() and panic afterwards :) 218 * dput() looks like it will do the right thing: 219 * - dec parent's ref counter 220 * - remove child from parent's child list 221 * - free child's inode if possible 222 * - free child 223 */ 224 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { 225 dput(dentry); 226 } 227 228 shrink_dcache_parent(dir); 229 return ret; 230 } 231 232 static int spufs_dir_close(struct inode *inode, struct file *file) 233 { 234 struct spu_context *ctx; 235 struct inode *parent; 236 struct dentry *dir; 237 int ret; 238 239 dir = file->f_path.dentry; 240 parent = dir->d_parent->d_inode; 241 ctx = SPUFS_I(dir->d_inode)->i_ctx; 242 243 mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT); 244 ret = spufs_rmdir(parent, dir); 245 mutex_unlock(&parent->i_mutex); 246 WARN_ON(ret); 247 248 /* We have to give up the mm_struct */ 249 spu_forget(ctx); 250 251 return dcache_dir_close(inode, file); 252 } 253 254 const struct file_operations spufs_context_fops = { 255 .open = dcache_dir_open, 256 .release = spufs_dir_close, 257 .llseek = dcache_dir_lseek, 258 .read = generic_read_dir, 259 .readdir = dcache_readdir, 260 .fsync = noop_fsync, 261 }; 262 EXPORT_SYMBOL_GPL(spufs_context_fops); 263 264 static int 265 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, 266 umode_t mode) 267 { 268 int ret; 269 struct inode *inode; 270 struct spu_context *ctx; 271 272 ret = -ENOSPC; 273 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); 274 if (!inode) 275 goto out; 276 277 if (dir->i_mode & S_ISGID) { 278 inode->i_gid = dir->i_gid; 279 inode->i_mode &= S_ISGID; 280 } 281 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */ 282 SPUFS_I(inode)->i_ctx = ctx; 283 if (!ctx) 284 goto out_iput; 285 286 ctx->flags = flags; 287 inode->i_op = &simple_dir_inode_operations; 288 inode->i_fop = &simple_dir_operations; 289 if (flags & SPU_CREATE_NOSCHED) 290 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents, 291 mode, ctx); 292 else 293 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx); 294 295 if (ret) 296 goto out_free_ctx; 297 298 if (spufs_get_sb_info(dir->i_sb)->debug) 299 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents, 300 mode, ctx); 301 302 if (ret) 303 goto out_free_ctx; 304 305 d_instantiate(dentry, inode); 306 dget(dentry); 307 inc_nlink(dir); 308 inc_nlink(dentry->d_inode); 309 goto out; 310 311 out_free_ctx: 312 spu_forget(ctx); 313 put_spu_context(ctx); 314 out_iput: 315 iput(inode); 316 out: 317 return ret; 318 } 319 320 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt) 321 { 322 int ret; 323 struct file *filp; 324 325 ret = get_unused_fd(); 326 if (ret < 0) { 327 dput(dentry); 328 mntput(mnt); 329 goto out; 330 } 331 332 filp = dentry_open(dentry, mnt, O_RDONLY, current_cred()); 333 if (IS_ERR(filp)) { 334 put_unused_fd(ret); 335 ret = PTR_ERR(filp); 336 goto out; 337 } 338 339 filp->f_op = &spufs_context_fops; 340 fd_install(ret, filp); 341 out: 342 return ret; 343 } 344 345 static struct spu_context * 346 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang, 347 struct file *filp) 348 { 349 struct spu_context *tmp, *neighbor, *err; 350 int count, node; 351 int aff_supp; 352 353 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next, 354 struct spu, cbe_list))->aff_list); 355 356 if (!aff_supp) 357 return ERR_PTR(-EINVAL); 358 359 if (flags & SPU_CREATE_GANG) 360 return ERR_PTR(-EINVAL); 361 362 if (flags & SPU_CREATE_AFFINITY_MEM && 363 gang->aff_ref_ctx && 364 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM) 365 return ERR_PTR(-EEXIST); 366 367 if (gang->aff_flags & AFF_MERGED) 368 return ERR_PTR(-EBUSY); 369 370 neighbor = NULL; 371 if (flags & SPU_CREATE_AFFINITY_SPU) { 372 if (!filp || filp->f_op != &spufs_context_fops) 373 return ERR_PTR(-EINVAL); 374 375 neighbor = get_spu_context( 376 SPUFS_I(filp->f_dentry->d_inode)->i_ctx); 377 378 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) && 379 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) && 380 !list_entry(neighbor->aff_list.next, struct spu_context, 381 aff_list)->aff_head) { 382 err = ERR_PTR(-EEXIST); 383 goto out_put_neighbor; 384 } 385 386 if (gang != neighbor->gang) { 387 err = ERR_PTR(-EINVAL); 388 goto out_put_neighbor; 389 } 390 391 count = 1; 392 list_for_each_entry(tmp, &gang->aff_list_head, aff_list) 393 count++; 394 if (list_empty(&neighbor->aff_list)) 395 count++; 396 397 for (node = 0; node < MAX_NUMNODES; node++) { 398 if ((cbe_spu_info[node].n_spus - atomic_read( 399 &cbe_spu_info[node].reserved_spus)) >= count) 400 break; 401 } 402 403 if (node == MAX_NUMNODES) { 404 err = ERR_PTR(-EEXIST); 405 goto out_put_neighbor; 406 } 407 } 408 409 return neighbor; 410 411 out_put_neighbor: 412 put_spu_context(neighbor); 413 return err; 414 } 415 416 static void 417 spufs_set_affinity(unsigned int flags, struct spu_context *ctx, 418 struct spu_context *neighbor) 419 { 420 if (flags & SPU_CREATE_AFFINITY_MEM) 421 ctx->gang->aff_ref_ctx = ctx; 422 423 if (flags & SPU_CREATE_AFFINITY_SPU) { 424 if (list_empty(&neighbor->aff_list)) { 425 list_add_tail(&neighbor->aff_list, 426 &ctx->gang->aff_list_head); 427 neighbor->aff_head = 1; 428 } 429 430 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head) 431 || list_entry(neighbor->aff_list.next, struct spu_context, 432 aff_list)->aff_head) { 433 list_add(&ctx->aff_list, &neighbor->aff_list); 434 } else { 435 list_add_tail(&ctx->aff_list, &neighbor->aff_list); 436 if (neighbor->aff_head) { 437 neighbor->aff_head = 0; 438 ctx->aff_head = 1; 439 } 440 } 441 442 if (!ctx->gang->aff_ref_ctx) 443 ctx->gang->aff_ref_ctx = ctx; 444 } 445 } 446 447 static int 448 spufs_create_context(struct inode *inode, struct dentry *dentry, 449 struct vfsmount *mnt, int flags, umode_t mode, 450 struct file *aff_filp) 451 { 452 int ret; 453 int affinity; 454 struct spu_gang *gang; 455 struct spu_context *neighbor; 456 457 ret = -EPERM; 458 if ((flags & SPU_CREATE_NOSCHED) && 459 !capable(CAP_SYS_NICE)) 460 goto out_unlock; 461 462 ret = -EINVAL; 463 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE)) 464 == SPU_CREATE_ISOLATE) 465 goto out_unlock; 466 467 ret = -ENODEV; 468 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader) 469 goto out_unlock; 470 471 gang = NULL; 472 neighbor = NULL; 473 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU); 474 if (affinity) { 475 gang = SPUFS_I(inode)->i_gang; 476 ret = -EINVAL; 477 if (!gang) 478 goto out_unlock; 479 mutex_lock(&gang->aff_mutex); 480 neighbor = spufs_assert_affinity(flags, gang, aff_filp); 481 if (IS_ERR(neighbor)) { 482 ret = PTR_ERR(neighbor); 483 goto out_aff_unlock; 484 } 485 } 486 487 ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO); 488 if (ret) 489 goto out_aff_unlock; 490 491 if (affinity) { 492 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx, 493 neighbor); 494 if (neighbor) 495 put_spu_context(neighbor); 496 } 497 498 /* 499 * get references for dget and mntget, will be released 500 * in error path of *_open(). 501 */ 502 ret = spufs_context_open(dget(dentry), mntget(mnt)); 503 if (ret < 0) { 504 WARN_ON(spufs_rmdir(inode, dentry)); 505 if (affinity) 506 mutex_unlock(&gang->aff_mutex); 507 mutex_unlock(&inode->i_mutex); 508 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx); 509 goto out; 510 } 511 512 out_aff_unlock: 513 if (affinity) 514 mutex_unlock(&gang->aff_mutex); 515 out_unlock: 516 mutex_unlock(&inode->i_mutex); 517 out: 518 dput(dentry); 519 return ret; 520 } 521 522 static int 523 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode) 524 { 525 int ret; 526 struct inode *inode; 527 struct spu_gang *gang; 528 529 ret = -ENOSPC; 530 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); 531 if (!inode) 532 goto out; 533 534 ret = 0; 535 if (dir->i_mode & S_ISGID) { 536 inode->i_gid = dir->i_gid; 537 inode->i_mode &= S_ISGID; 538 } 539 gang = alloc_spu_gang(); 540 SPUFS_I(inode)->i_ctx = NULL; 541 SPUFS_I(inode)->i_gang = gang; 542 if (!gang) 543 goto out_iput; 544 545 inode->i_op = &simple_dir_inode_operations; 546 inode->i_fop = &simple_dir_operations; 547 548 d_instantiate(dentry, inode); 549 inc_nlink(dir); 550 inc_nlink(dentry->d_inode); 551 return ret; 552 553 out_iput: 554 iput(inode); 555 out: 556 return ret; 557 } 558 559 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt) 560 { 561 int ret; 562 struct file *filp; 563 564 ret = get_unused_fd(); 565 if (ret < 0) { 566 dput(dentry); 567 mntput(mnt); 568 goto out; 569 } 570 571 filp = dentry_open(dentry, mnt, O_RDONLY, current_cred()); 572 if (IS_ERR(filp)) { 573 put_unused_fd(ret); 574 ret = PTR_ERR(filp); 575 goto out; 576 } 577 578 filp->f_op = &simple_dir_operations; 579 fd_install(ret, filp); 580 out: 581 return ret; 582 } 583 584 static int spufs_create_gang(struct inode *inode, 585 struct dentry *dentry, 586 struct vfsmount *mnt, umode_t mode) 587 { 588 int ret; 589 590 ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO); 591 if (ret) 592 goto out; 593 594 /* 595 * get references for dget and mntget, will be released 596 * in error path of *_open(). 597 */ 598 ret = spufs_gang_open(dget(dentry), mntget(mnt)); 599 if (ret < 0) { 600 int err = simple_rmdir(inode, dentry); 601 WARN_ON(err); 602 } 603 604 out: 605 mutex_unlock(&inode->i_mutex); 606 dput(dentry); 607 return ret; 608 } 609 610 611 static struct file_system_type spufs_type; 612 613 long spufs_create(struct path *path, struct dentry *dentry, 614 unsigned int flags, umode_t mode, struct file *filp) 615 { 616 int ret; 617 618 ret = -EINVAL; 619 /* check if we are on spufs */ 620 if (path->dentry->d_sb->s_type != &spufs_type) 621 goto out; 622 623 /* don't accept undefined flags */ 624 if (flags & (~SPU_CREATE_FLAG_ALL)) 625 goto out; 626 627 /* only threads can be underneath a gang */ 628 if (path->dentry != path->dentry->d_sb->s_root) { 629 if ((flags & SPU_CREATE_GANG) || 630 !SPUFS_I(path->dentry->d_inode)->i_gang) 631 goto out; 632 } 633 634 mode &= ~current_umask(); 635 636 if (flags & SPU_CREATE_GANG) 637 ret = spufs_create_gang(path->dentry->d_inode, 638 dentry, path->mnt, mode); 639 else 640 ret = spufs_create_context(path->dentry->d_inode, 641 dentry, path->mnt, flags, mode, 642 filp); 643 if (ret >= 0) 644 fsnotify_mkdir(path->dentry->d_inode, dentry); 645 return ret; 646 647 out: 648 mutex_unlock(&path->dentry->d_inode->i_mutex); 649 dput(dentry); 650 return ret; 651 } 652 653 /* File system initialization */ 654 enum { 655 Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err, 656 }; 657 658 static const match_table_t spufs_tokens = { 659 { Opt_uid, "uid=%d" }, 660 { Opt_gid, "gid=%d" }, 661 { Opt_mode, "mode=%o" }, 662 { Opt_debug, "debug" }, 663 { Opt_err, NULL }, 664 }; 665 666 static int 667 spufs_parse_options(struct super_block *sb, char *options, struct inode *root) 668 { 669 char *p; 670 substring_t args[MAX_OPT_ARGS]; 671 672 while ((p = strsep(&options, ",")) != NULL) { 673 int token, option; 674 675 if (!*p) 676 continue; 677 678 token = match_token(p, spufs_tokens, args); 679 switch (token) { 680 case Opt_uid: 681 if (match_int(&args[0], &option)) 682 return 0; 683 root->i_uid = option; 684 break; 685 case Opt_gid: 686 if (match_int(&args[0], &option)) 687 return 0; 688 root->i_gid = option; 689 break; 690 case Opt_mode: 691 if (match_octal(&args[0], &option)) 692 return 0; 693 root->i_mode = option | S_IFDIR; 694 break; 695 case Opt_debug: 696 spufs_get_sb_info(sb)->debug = 1; 697 break; 698 default: 699 return 0; 700 } 701 } 702 return 1; 703 } 704 705 static void spufs_exit_isolated_loader(void) 706 { 707 free_pages((unsigned long) isolated_loader, 708 get_order(isolated_loader_size)); 709 } 710 711 static void 712 spufs_init_isolated_loader(void) 713 { 714 struct device_node *dn; 715 const char *loader; 716 int size; 717 718 dn = of_find_node_by_path("/spu-isolation"); 719 if (!dn) 720 return; 721 722 loader = of_get_property(dn, "loader", &size); 723 if (!loader) 724 return; 725 726 /* the loader must be align on a 16 byte boundary */ 727 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size)); 728 if (!isolated_loader) 729 return; 730 731 isolated_loader_size = size; 732 memcpy(isolated_loader, loader, size); 733 printk(KERN_INFO "spufs: SPU isolation mode enabled\n"); 734 } 735 736 static int 737 spufs_create_root(struct super_block *sb, void *data) 738 { 739 struct inode *inode; 740 int ret; 741 742 ret = -ENODEV; 743 if (!spu_management_ops) 744 goto out; 745 746 ret = -ENOMEM; 747 inode = spufs_new_inode(sb, S_IFDIR | 0775); 748 if (!inode) 749 goto out; 750 751 inode->i_op = &simple_dir_inode_operations; 752 inode->i_fop = &simple_dir_operations; 753 SPUFS_I(inode)->i_ctx = NULL; 754 inc_nlink(inode); 755 756 ret = -EINVAL; 757 if (!spufs_parse_options(sb, data, inode)) 758 goto out_iput; 759 760 ret = -ENOMEM; 761 sb->s_root = d_make_root(inode); 762 if (!sb->s_root) 763 goto out; 764 765 return 0; 766 out_iput: 767 iput(inode); 768 out: 769 return ret; 770 } 771 772 static int 773 spufs_fill_super(struct super_block *sb, void *data, int silent) 774 { 775 struct spufs_sb_info *info; 776 static const struct super_operations s_ops = { 777 .alloc_inode = spufs_alloc_inode, 778 .destroy_inode = spufs_destroy_inode, 779 .statfs = simple_statfs, 780 .evict_inode = spufs_evict_inode, 781 .show_options = generic_show_options, 782 }; 783 784 save_mount_options(sb, data); 785 786 info = kzalloc(sizeof(*info), GFP_KERNEL); 787 if (!info) 788 return -ENOMEM; 789 790 sb->s_maxbytes = MAX_LFS_FILESIZE; 791 sb->s_blocksize = PAGE_CACHE_SIZE; 792 sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 793 sb->s_magic = SPUFS_MAGIC; 794 sb->s_op = &s_ops; 795 sb->s_fs_info = info; 796 797 return spufs_create_root(sb, data); 798 } 799 800 static struct dentry * 801 spufs_mount(struct file_system_type *fstype, int flags, 802 const char *name, void *data) 803 { 804 return mount_single(fstype, flags, data, spufs_fill_super); 805 } 806 807 static struct file_system_type spufs_type = { 808 .owner = THIS_MODULE, 809 .name = "spufs", 810 .mount = spufs_mount, 811 .kill_sb = kill_litter_super, 812 }; 813 814 static int __init spufs_init(void) 815 { 816 int ret; 817 818 ret = -ENODEV; 819 if (!spu_management_ops) 820 goto out; 821 822 ret = -ENOMEM; 823 spufs_inode_cache = kmem_cache_create("spufs_inode_cache", 824 sizeof(struct spufs_inode_info), 0, 825 SLAB_HWCACHE_ALIGN, spufs_init_once); 826 827 if (!spufs_inode_cache) 828 goto out; 829 ret = spu_sched_init(); 830 if (ret) 831 goto out_cache; 832 ret = register_spu_syscalls(&spufs_calls); 833 if (ret) 834 goto out_sched; 835 ret = register_filesystem(&spufs_type); 836 if (ret) 837 goto out_syscalls; 838 839 spufs_init_isolated_loader(); 840 841 return 0; 842 843 out_syscalls: 844 unregister_spu_syscalls(&spufs_calls); 845 out_sched: 846 spu_sched_exit(); 847 out_cache: 848 kmem_cache_destroy(spufs_inode_cache); 849 out: 850 return ret; 851 } 852 module_init(spufs_init); 853 854 static void __exit spufs_exit(void) 855 { 856 spu_sched_exit(); 857 spufs_exit_isolated_loader(); 858 unregister_spu_syscalls(&spufs_calls); 859 unregister_filesystem(&spufs_type); 860 kmem_cache_destroy(spufs_inode_cache); 861 } 862 module_exit(spufs_exit); 863 864 MODULE_LICENSE("GPL"); 865 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); 866 867