arch/powerpc/platforms/cell/spufs/inode.c

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