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 INIT_LIST_HEAD(&inode->i_dentry); 78 kmem_cache_free(spufs_inode_cache, SPUFS_I(inode)); 79 } 80 81 static void spufs_destroy_inode(struct inode *inode) 82 { 83 call_rcu(&inode->i_rcu, spufs_i_callback); 84 } 85 86 static void 87 spufs_init_once(void *p) 88 { 89 struct spufs_inode_info *ei = p; 90 91 inode_init_once(&ei->vfs_inode); 92 } 93 94 static struct inode * 95 spufs_new_inode(struct super_block *sb, int mode) 96 { 97 struct inode *inode; 98 99 inode = new_inode(sb); 100 if (!inode) 101 goto out; 102 103 inode->i_mode = mode; 104 inode->i_uid = current_fsuid(); 105 inode->i_gid = current_fsgid(); 106 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 107 out: 108 return inode; 109 } 110 111 static int 112 spufs_setattr(struct dentry *dentry, struct iattr *attr) 113 { 114 struct inode *inode = dentry->d_inode; 115 116 if ((attr->ia_valid & ATTR_SIZE) && 117 (attr->ia_size != inode->i_size)) 118 return -EINVAL; 119 setattr_copy(inode, attr); 120 mark_inode_dirty(inode); 121 return 0; 122 } 123 124 125 static int 126 spufs_new_file(struct super_block *sb, struct dentry *dentry, 127 const struct file_operations *fops, int mode, 128 size_t size, struct spu_context *ctx) 129 { 130 static const struct inode_operations spufs_file_iops = { 131 .setattr = spufs_setattr, 132 }; 133 struct inode *inode; 134 int ret; 135 136 ret = -ENOSPC; 137 inode = spufs_new_inode(sb, S_IFREG | mode); 138 if (!inode) 139 goto out; 140 141 ret = 0; 142 inode->i_op = &spufs_file_iops; 143 inode->i_fop = fops; 144 inode->i_size = size; 145 inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx); 146 d_add(dentry, inode); 147 out: 148 return ret; 149 } 150 151 static void 152 spufs_evict_inode(struct inode *inode) 153 { 154 struct spufs_inode_info *ei = SPUFS_I(inode); 155 end_writeback(inode); 156 if (ei->i_ctx) 157 put_spu_context(ei->i_ctx); 158 if (ei->i_gang) 159 put_spu_gang(ei->i_gang); 160 } 161 162 static void spufs_prune_dir(struct dentry *dir) 163 { 164 struct dentry *dentry, *tmp; 165 166 mutex_lock(&dir->d_inode->i_mutex); 167 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { 168 spin_lock(&dentry->d_lock); 169 if (!(d_unhashed(dentry)) && dentry->d_inode) { 170 dget_dlock(dentry); 171 __d_drop(dentry); 172 spin_unlock(&dentry->d_lock); 173 simple_unlink(dir->d_inode, dentry); 174 /* XXX: what was dcache_lock protecting here? Other 175 * filesystems (IB, configfs) release dcache_lock 176 * before unlink */ 177 dput(dentry); 178 } else { 179 spin_unlock(&dentry->d_lock); 180 } 181 } 182 shrink_dcache_parent(dir); 183 mutex_unlock(&dir->d_inode->i_mutex); 184 } 185 186 /* Caller must hold parent->i_mutex */ 187 static int spufs_rmdir(struct inode *parent, struct dentry *dir) 188 { 189 /* remove all entries */ 190 spufs_prune_dir(dir); 191 d_drop(dir); 192 193 return simple_rmdir(parent, dir); 194 } 195 196 static int spufs_fill_dir(struct dentry *dir, 197 const struct spufs_tree_descr *files, int mode, 198 struct spu_context *ctx) 199 { 200 struct dentry *dentry, *tmp; 201 int ret; 202 203 while (files->name && files->name[0]) { 204 ret = -ENOMEM; 205 dentry = d_alloc_name(dir, files->name); 206 if (!dentry) 207 goto out; 208 ret = spufs_new_file(dir->d_sb, dentry, files->ops, 209 files->mode & mode, files->size, ctx); 210 if (ret) 211 goto out; 212 files++; 213 } 214 return 0; 215 out: 216 /* 217 * remove all children from dir. dir->inode is not set so don't 218 * just simply use spufs_prune_dir() and panic afterwards :) 219 * dput() looks like it will do the right thing: 220 * - dec parent's ref counter 221 * - remove child from parent's child list 222 * - free child's inode if possible 223 * - free child 224 */ 225 list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { 226 dput(dentry); 227 } 228 229 shrink_dcache_parent(dir); 230 return ret; 231 } 232 233 static int spufs_dir_close(struct inode *inode, struct file *file) 234 { 235 struct spu_context *ctx; 236 struct inode *parent; 237 struct dentry *dir; 238 int ret; 239 240 dir = file->f_path.dentry; 241 parent = dir->d_parent->d_inode; 242 ctx = SPUFS_I(dir->d_inode)->i_ctx; 243 244 mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT); 245 ret = spufs_rmdir(parent, dir); 246 mutex_unlock(&parent->i_mutex); 247 WARN_ON(ret); 248 249 /* We have to give up the mm_struct */ 250 spu_forget(ctx); 251 252 return dcache_dir_close(inode, file); 253 } 254 255 const struct file_operations spufs_context_fops = { 256 .open = dcache_dir_open, 257 .release = spufs_dir_close, 258 .llseek = dcache_dir_lseek, 259 .read = generic_read_dir, 260 .readdir = dcache_readdir, 261 .fsync = noop_fsync, 262 }; 263 EXPORT_SYMBOL_GPL(spufs_context_fops); 264 265 static int 266 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, 267 int mode) 268 { 269 int ret; 270 struct inode *inode; 271 struct spu_context *ctx; 272 273 ret = -ENOSPC; 274 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); 275 if (!inode) 276 goto out; 277 278 if (dir->i_mode & S_ISGID) { 279 inode->i_gid = dir->i_gid; 280 inode->i_mode &= S_ISGID; 281 } 282 ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */ 283 SPUFS_I(inode)->i_ctx = ctx; 284 if (!ctx) 285 goto out_iput; 286 287 ctx->flags = flags; 288 inode->i_op = &simple_dir_inode_operations; 289 inode->i_fop = &simple_dir_operations; 290 if (flags & SPU_CREATE_NOSCHED) 291 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents, 292 mode, ctx); 293 else 294 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx); 295 296 if (ret) 297 goto out_free_ctx; 298 299 if (spufs_get_sb_info(dir->i_sb)->debug) 300 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents, 301 mode, ctx); 302 303 if (ret) 304 goto out_free_ctx; 305 306 d_instantiate(dentry, inode); 307 dget(dentry); 308 inc_nlink(dir); 309 inc_nlink(dentry->d_inode); 310 goto out; 311 312 out_free_ctx: 313 spu_forget(ctx); 314 put_spu_context(ctx); 315 out_iput: 316 iput(inode); 317 out: 318 return ret; 319 } 320 321 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt) 322 { 323 int ret; 324 struct file *filp; 325 326 ret = get_unused_fd(); 327 if (ret < 0) { 328 dput(dentry); 329 mntput(mnt); 330 goto out; 331 } 332 333 filp = dentry_open(dentry, mnt, O_RDONLY, current_cred()); 334 if (IS_ERR(filp)) { 335 put_unused_fd(ret); 336 ret = PTR_ERR(filp); 337 goto out; 338 } 339 340 filp->f_op = &spufs_context_fops; 341 fd_install(ret, filp); 342 out: 343 return ret; 344 } 345 346 static struct spu_context * 347 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang, 348 struct file *filp) 349 { 350 struct spu_context *tmp, *neighbor, *err; 351 int count, node; 352 int aff_supp; 353 354 aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next, 355 struct spu, cbe_list))->aff_list); 356 357 if (!aff_supp) 358 return ERR_PTR(-EINVAL); 359 360 if (flags & SPU_CREATE_GANG) 361 return ERR_PTR(-EINVAL); 362 363 if (flags & SPU_CREATE_AFFINITY_MEM && 364 gang->aff_ref_ctx && 365 gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM) 366 return ERR_PTR(-EEXIST); 367 368 if (gang->aff_flags & AFF_MERGED) 369 return ERR_PTR(-EBUSY); 370 371 neighbor = NULL; 372 if (flags & SPU_CREATE_AFFINITY_SPU) { 373 if (!filp || filp->f_op != &spufs_context_fops) 374 return ERR_PTR(-EINVAL); 375 376 neighbor = get_spu_context( 377 SPUFS_I(filp->f_dentry->d_inode)->i_ctx); 378 379 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) && 380 !list_is_last(&neighbor->aff_list, &gang->aff_list_head) && 381 !list_entry(neighbor->aff_list.next, struct spu_context, 382 aff_list)->aff_head) { 383 err = ERR_PTR(-EEXIST); 384 goto out_put_neighbor; 385 } 386 387 if (gang != neighbor->gang) { 388 err = ERR_PTR(-EINVAL); 389 goto out_put_neighbor; 390 } 391 392 count = 1; 393 list_for_each_entry(tmp, &gang->aff_list_head, aff_list) 394 count++; 395 if (list_empty(&neighbor->aff_list)) 396 count++; 397 398 for (node = 0; node < MAX_NUMNODES; node++) { 399 if ((cbe_spu_info[node].n_spus - atomic_read( 400 &cbe_spu_info[node].reserved_spus)) >= count) 401 break; 402 } 403 404 if (node == MAX_NUMNODES) { 405 err = ERR_PTR(-EEXIST); 406 goto out_put_neighbor; 407 } 408 } 409 410 return neighbor; 411 412 out_put_neighbor: 413 put_spu_context(neighbor); 414 return err; 415 } 416 417 static void 418 spufs_set_affinity(unsigned int flags, struct spu_context *ctx, 419 struct spu_context *neighbor) 420 { 421 if (flags & SPU_CREATE_AFFINITY_MEM) 422 ctx->gang->aff_ref_ctx = ctx; 423 424 if (flags & SPU_CREATE_AFFINITY_SPU) { 425 if (list_empty(&neighbor->aff_list)) { 426 list_add_tail(&neighbor->aff_list, 427 &ctx->gang->aff_list_head); 428 neighbor->aff_head = 1; 429 } 430 431 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head) 432 || list_entry(neighbor->aff_list.next, struct spu_context, 433 aff_list)->aff_head) { 434 list_add(&ctx->aff_list, &neighbor->aff_list); 435 } else { 436 list_add_tail(&ctx->aff_list, &neighbor->aff_list); 437 if (neighbor->aff_head) { 438 neighbor->aff_head = 0; 439 ctx->aff_head = 1; 440 } 441 } 442 443 if (!ctx->gang->aff_ref_ctx) 444 ctx->gang->aff_ref_ctx = ctx; 445 } 446 } 447 448 static int 449 spufs_create_context(struct inode *inode, struct dentry *dentry, 450 struct vfsmount *mnt, int flags, int mode, 451 struct file *aff_filp) 452 { 453 int ret; 454 int affinity; 455 struct spu_gang *gang; 456 struct spu_context *neighbor; 457 458 ret = -EPERM; 459 if ((flags & SPU_CREATE_NOSCHED) && 460 !capable(CAP_SYS_NICE)) 461 goto out_unlock; 462 463 ret = -EINVAL; 464 if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE)) 465 == SPU_CREATE_ISOLATE) 466 goto out_unlock; 467 468 ret = -ENODEV; 469 if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader) 470 goto out_unlock; 471 472 gang = NULL; 473 neighbor = NULL; 474 affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU); 475 if (affinity) { 476 gang = SPUFS_I(inode)->i_gang; 477 ret = -EINVAL; 478 if (!gang) 479 goto out_unlock; 480 mutex_lock(&gang->aff_mutex); 481 neighbor = spufs_assert_affinity(flags, gang, aff_filp); 482 if (IS_ERR(neighbor)) { 483 ret = PTR_ERR(neighbor); 484 goto out_aff_unlock; 485 } 486 } 487 488 ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO); 489 if (ret) 490 goto out_aff_unlock; 491 492 if (affinity) { 493 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx, 494 neighbor); 495 if (neighbor) 496 put_spu_context(neighbor); 497 } 498 499 /* 500 * get references for dget and mntget, will be released 501 * in error path of *_open(). 502 */ 503 ret = spufs_context_open(dget(dentry), mntget(mnt)); 504 if (ret < 0) { 505 WARN_ON(spufs_rmdir(inode, dentry)); 506 if (affinity) 507 mutex_unlock(&gang->aff_mutex); 508 mutex_unlock(&inode->i_mutex); 509 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx); 510 goto out; 511 } 512 513 out_aff_unlock: 514 if (affinity) 515 mutex_unlock(&gang->aff_mutex); 516 out_unlock: 517 mutex_unlock(&inode->i_mutex); 518 out: 519 dput(dentry); 520 return ret; 521 } 522 523 static int 524 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode) 525 { 526 int ret; 527 struct inode *inode; 528 struct spu_gang *gang; 529 530 ret = -ENOSPC; 531 inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); 532 if (!inode) 533 goto out; 534 535 ret = 0; 536 if (dir->i_mode & S_ISGID) { 537 inode->i_gid = dir->i_gid; 538 inode->i_mode &= S_ISGID; 539 } 540 gang = alloc_spu_gang(); 541 SPUFS_I(inode)->i_ctx = NULL; 542 SPUFS_I(inode)->i_gang = gang; 543 if (!gang) 544 goto out_iput; 545 546 inode->i_op = &simple_dir_inode_operations; 547 inode->i_fop = &simple_dir_operations; 548 549 d_instantiate(dentry, inode); 550 inc_nlink(dir); 551 inc_nlink(dentry->d_inode); 552 return ret; 553 554 out_iput: 555 iput(inode); 556 out: 557 return ret; 558 } 559 560 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt) 561 { 562 int ret; 563 struct file *filp; 564 565 ret = get_unused_fd(); 566 if (ret < 0) { 567 dput(dentry); 568 mntput(mnt); 569 goto out; 570 } 571 572 filp = dentry_open(dentry, mnt, O_RDONLY, current_cred()); 573 if (IS_ERR(filp)) { 574 put_unused_fd(ret); 575 ret = PTR_ERR(filp); 576 goto out; 577 } 578 579 filp->f_op = &simple_dir_operations; 580 fd_install(ret, filp); 581 out: 582 return ret; 583 } 584 585 static int spufs_create_gang(struct inode *inode, 586 struct dentry *dentry, 587 struct vfsmount *mnt, int mode) 588 { 589 int ret; 590 591 ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO); 592 if (ret) 593 goto out; 594 595 /* 596 * get references for dget and mntget, will be released 597 * in error path of *_open(). 598 */ 599 ret = spufs_gang_open(dget(dentry), mntget(mnt)); 600 if (ret < 0) { 601 int err = simple_rmdir(inode, dentry); 602 WARN_ON(err); 603 } 604 605 out: 606 mutex_unlock(&inode->i_mutex); 607 dput(dentry); 608 return ret; 609 } 610 611 612 static struct file_system_type spufs_type; 613 614 long spufs_create(struct path *path, struct dentry *dentry, 615 unsigned int flags, mode_t mode, struct file *filp) 616 { 617 int ret; 618 619 ret = -EINVAL; 620 /* check if we are on spufs */ 621 if (path->dentry->d_sb->s_type != &spufs_type) 622 goto out; 623 624 /* don't accept undefined flags */ 625 if (flags & (~SPU_CREATE_FLAG_ALL)) 626 goto out; 627 628 /* only threads can be underneath a gang */ 629 if (path->dentry != path->dentry->d_sb->s_root) { 630 if ((flags & SPU_CREATE_GANG) || 631 !SPUFS_I(path->dentry->d_inode)->i_gang) 632 goto out; 633 } 634 635 mode &= ~current_umask(); 636 637 if (flags & SPU_CREATE_GANG) 638 ret = spufs_create_gang(path->dentry->d_inode, 639 dentry, path->mnt, mode); 640 else 641 ret = spufs_create_context(path->dentry->d_inode, 642 dentry, path->mnt, flags, mode, 643 filp); 644 if (ret >= 0) 645 fsnotify_mkdir(path->dentry->d_inode, dentry); 646 return ret; 647 648 out: 649 mutex_unlock(&path->dentry->d_inode->i_mutex); 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_alloc_root(inode); 762 if (!sb->s_root) 763 goto out_iput; 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_filesystem(&spufs_type); 833 if (ret) 834 goto out_sched; 835 ret = register_spu_syscalls(&spufs_calls); 836 if (ret) 837 goto out_fs; 838 839 spufs_init_isolated_loader(); 840 841 return 0; 842 843 out_fs: 844 unregister_filesystem(&spufs_type); 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