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

   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/backing-dev.h>
  27 #include <linux/init.h>
  28 #include <linux/ioctl.h>
  29 #include <linux/module.h>
  30 #include <linux/mount.h>
  31 #include <linux/namei.h>
  32 #include <linux/pagemap.h>
  33 #include <linux/poll.h>
  34 #include <linux/slab.h>
  35 #include <linux/parser.h>
  36
  37 #include <asm/prom.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         d_drop(dir);
 175
 176         return simple_rmdir(parent, dir);
 177 }
 178
 179 static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
 180                           int mode, struct spu_context *ctx)
 181 {
 182         struct dentry *dentry, *tmp;
 183         int ret;
 184
 185         while (files->name && files->name[0]) {
 186                 ret = -ENOMEM;
 187                 dentry = d_alloc_name(dir, files->name);
 188                 if (!dentry)
 189                         goto out;
 190                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 191                                         files->mode & mode, ctx);
 192                 if (ret)
 193                         goto out;
 194                 files++;
 195         }
 196         return 0;
 197 out:
 198         /*
 199          * remove all children from dir. dir->inode is not set so don't
 200          * just simply use spufs_prune_dir() and panic afterwards :)
 201          * dput() looks like it will do the right thing:
 202          * - dec parent's ref counter
 203          * - remove child from parent's child list
 204          * - free child's inode if possible
 205          * - free child
 206          */
 207         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 208                 dput(dentry);
 209         }
 210
 211         shrink_dcache_parent(dir);
 212         return ret;
 213 }
 214
 215 static int spufs_dir_close(struct inode *inode, struct file *file)
 216 {
 217         struct spu_context *ctx;
 218         struct inode *parent;
 219         struct dentry *dir;
 220         int ret;
 221
 222         dir = file->f_path.dentry;
 223         parent = dir->d_parent->d_inode;
 224         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 225
 226         mutex_lock(&parent->i_mutex);
 227         ret = spufs_rmdir(parent, dir);
 228         mutex_unlock(&parent->i_mutex);
 229         WARN_ON(ret);
 230
 231         /* We have to give up the mm_struct */
 232         spu_forget(ctx);
 233
 234         return dcache_dir_close(inode, file);
 235 }
 236
 237 const struct file_operations spufs_context_fops = {
 238         .open           = dcache_dir_open,
 239         .release        = spufs_dir_close,
 240         .llseek         = dcache_dir_lseek,
 241         .read           = generic_read_dir,
 242         .readdir        = dcache_readdir,
 243         .fsync          = simple_sync_file,
 244 };
 245 EXPORT_SYMBOL_GPL(spufs_context_fops);
 246
 247 static int
 248 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 249                 int mode)
 250 {
 251         int ret;
 252         struct inode *inode;
 253         struct spu_context *ctx;
 254
 255         ret = -ENOSPC;
 256         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 257         if (!inode)
 258                 goto out;
 259
 260         if (dir->i_mode & S_ISGID) {
 261                 inode->i_gid = dir->i_gid;
 262                 inode->i_mode &= S_ISGID;
 263         }
 264         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 265         SPUFS_I(inode)->i_ctx = ctx;
 266         if (!ctx)
 267                 goto out_iput;
 268
 269         ctx->flags = flags;
 270         inode->i_op = &simple_dir_inode_operations;
 271         inode->i_fop = &simple_dir_operations;
 272         if (flags & SPU_CREATE_NOSCHED)
 273                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 274                                          mode, ctx);
 275         else
 276                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 277
 278         if (ret)
 279                 goto out_free_ctx;
 280
 281         d_instantiate(dentry, inode);
 282         dget(dentry);
 283         dir->i_nlink++;
 284         dentry->d_inode->i_nlink++;
 285         goto out;
 286
 287 out_free_ctx:
 288         spu_forget(ctx);
 289         put_spu_context(ctx);
 290 out_iput:
 291         iput(inode);
 292 out:
 293         return ret;
 294 }
 295
 296 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 297 {
 298         int ret;
 299         struct file *filp;
 300
 301         ret = get_unused_fd();
 302         if (ret < 0) {
 303                 dput(dentry);
 304                 mntput(mnt);
 305                 goto out;
 306         }
 307
 308         filp = dentry_open(dentry, mnt, O_RDONLY);
 309         if (IS_ERR(filp)) {
 310                 put_unused_fd(ret);
 311                 ret = PTR_ERR(filp);
 312                 goto out;
 313         }
 314
 315         filp->f_op = &spufs_context_fops;
 316         fd_install(ret, filp);
 317 out:
 318         return ret;
 319 }
 320
 321 static struct spu_context *
 322 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 323                                                 struct file *filp)
 324 {
 325         struct spu_context *tmp, *neighbor, *err;
 326         int count, node;
 327         int aff_supp;
 328
 329         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 330                                         struct spu, cbe_list))->aff_list);
 331
 332         if (!aff_supp)
 333                 return ERR_PTR(-EINVAL);
 334
 335         if (flags & SPU_CREATE_GANG)
 336                 return ERR_PTR(-EINVAL);
 337
 338         if (flags & SPU_CREATE_AFFINITY_MEM &&
 339             gang->aff_ref_ctx &&
 340             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 341                 return ERR_PTR(-EEXIST);
 342
 343         if (gang->aff_flags & AFF_MERGED)
 344                 return ERR_PTR(-EBUSY);
 345
 346         neighbor = NULL;
 347         if (flags & SPU_CREATE_AFFINITY_SPU) {
 348                 if (!filp || filp->f_op != &spufs_context_fops)
 349                         return ERR_PTR(-EINVAL);
 350
 351                 neighbor = get_spu_context(
 352                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
 353
 354                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 355                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 356                     !list_entry(neighbor->aff_list.next, struct spu_context,
 357                     aff_list)->aff_head) {
 358                         err = ERR_PTR(-EEXIST);
 359                         goto out_put_neighbor;
 360                 }
 361
 362                 if (gang != neighbor->gang) {
 363                         err = ERR_PTR(-EINVAL);
 364                         goto out_put_neighbor;
 365                 }
 366
 367                 count = 1;
 368                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 369                         count++;
 370                 if (list_empty(&neighbor->aff_list))
 371                         count++;
 372
 373                 for (node = 0; node < MAX_NUMNODES; node++) {
 374                         if ((cbe_spu_info[node].n_spus - atomic_read(
 375                                 &cbe_spu_info[node].reserved_spus)) >= count)
 376                                 break;
 377                 }
 378
 379                 if (node == MAX_NUMNODES) {
 380                         err = ERR_PTR(-EEXIST);
 381                         goto out_put_neighbor;
 382                 }
 383         }
 384
 385         return neighbor;
 386
 387 out_put_neighbor:
 388         put_spu_context(neighbor);
 389         return err;
 390 }
 391
 392 static void
 393 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 394                                         struct spu_context *neighbor)
 395 {
 396         if (flags & SPU_CREATE_AFFINITY_MEM)
 397                 ctx->gang->aff_ref_ctx = ctx;
 398
 399         if (flags & SPU_CREATE_AFFINITY_SPU) {
 400                 if (list_empty(&neighbor->aff_list)) {
 401                         list_add_tail(&neighbor->aff_list,
 402                                 &ctx->gang->aff_list_head);
 403                         neighbor->aff_head = 1;
 404                 }
 405
 406                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 407                     || list_entry(neighbor->aff_list.next, struct spu_context,
 408                                                         aff_list)->aff_head) {
 409                         list_add(&ctx->aff_list, &neighbor->aff_list);
 410                 } else  {
 411                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 412                         if (neighbor->aff_head) {
 413                                 neighbor->aff_head = 0;
 414                                 ctx->aff_head = 1;
 415                         }
 416                 }
 417
 418                 if (!ctx->gang->aff_ref_ctx)
 419                         ctx->gang->aff_ref_ctx = ctx;
 420         }
 421 }
 422
 423 static int
 424 spufs_create_context(struct inode *inode, struct dentry *dentry,
 425                         struct vfsmount *mnt, int flags, int mode,
 426                         struct file *aff_filp)
 427 {
 428         int ret;
 429         int affinity;
 430         struct spu_gang *gang;
 431         struct spu_context *neighbor;
 432
 433         ret = -EPERM;
 434         if ((flags & SPU_CREATE_NOSCHED) &&
 435             !capable(CAP_SYS_NICE))
 436                 goto out_unlock;
 437
 438         ret = -EINVAL;
 439         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 440             == SPU_CREATE_ISOLATE)
 441                 goto out_unlock;
 442
 443         ret = -ENODEV;
 444         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 445                 goto out_unlock;
 446
 447         gang = NULL;
 448         neighbor = NULL;
 449         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 450         if (affinity) {
 451                 gang = SPUFS_I(inode)->i_gang;
 452                 ret = -EINVAL;
 453                 if (!gang)
 454                         goto out_unlock;
 455                 mutex_lock(&gang->aff_mutex);
 456                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 457                 if (IS_ERR(neighbor)) {
 458                         ret = PTR_ERR(neighbor);
 459                         goto out_aff_unlock;
 460                 }
 461         }
 462
 463         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 464         if (ret)
 465                 goto out_aff_unlock;
 466
 467         if (affinity) {
 468                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 469                                                                 neighbor);
 470                 if (neighbor)
 471                         put_spu_context(neighbor);
 472         }
 473
 474         /*
 475          * get references for dget and mntget, will be released
 476          * in error path of *_open().
 477          */
 478         ret = spufs_context_open(dget(dentry), mntget(mnt));
 479         if (ret < 0) {
 480                 WARN_ON(spufs_rmdir(inode, dentry));
 481                 mutex_unlock(&inode->i_mutex);
 482                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 483                 goto out;
 484         }
 485
 486 out_aff_unlock:
 487         if (affinity)
 488                 mutex_unlock(&gang->aff_mutex);
 489 out_unlock:
 490         mutex_unlock(&inode->i_mutex);
 491 out:
 492         dput(dentry);
 493         return ret;
 494 }
 495
 496 static int
 497 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
 498 {
 499         int ret;
 500         struct inode *inode;
 501         struct spu_gang *gang;
 502
 503         ret = -ENOSPC;
 504         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 505         if (!inode)
 506                 goto out;
 507
 508         ret = 0;
 509         if (dir->i_mode & S_ISGID) {
 510                 inode->i_gid = dir->i_gid;
 511                 inode->i_mode &= S_ISGID;
 512         }
 513         gang = alloc_spu_gang();
 514         SPUFS_I(inode)->i_ctx = NULL;
 515         SPUFS_I(inode)->i_gang = gang;
 516         if (!gang)
 517                 goto out_iput;
 518
 519         inode->i_op = &simple_dir_inode_operations;
 520         inode->i_fop = &simple_dir_operations;
 521
 522         d_instantiate(dentry, inode);
 523         dir->i_nlink++;
 524         dentry->d_inode->i_nlink++;
 525         return ret;
 526
 527 out_iput:
 528         iput(inode);
 529 out:
 530         return ret;
 531 }
 532
 533 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 534 {
 535         int ret;
 536         struct file *filp;
 537
 538         ret = get_unused_fd();
 539         if (ret < 0) {
 540                 dput(dentry);
 541                 mntput(mnt);
 542                 goto out;
 543         }
 544
 545         filp = dentry_open(dentry, mnt, O_RDONLY);
 546         if (IS_ERR(filp)) {
 547                 put_unused_fd(ret);
 548                 ret = PTR_ERR(filp);
 549                 goto out;
 550         }
 551
 552         filp->f_op = &simple_dir_operations;
 553         fd_install(ret, filp);
 554 out:
 555         return ret;
 556 }
 557
 558 static int spufs_create_gang(struct inode *inode,
 559                         struct dentry *dentry,
 560                         struct vfsmount *mnt, int mode)
 561 {
 562         int ret;
 563
 564         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 565         if (ret)
 566                 goto out;
 567
 568         /*
 569          * get references for dget and mntget, will be released
 570          * in error path of *_open().
 571          */
 572         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 573         if (ret < 0) {
 574                 int err = simple_rmdir(inode, dentry);
 575                 WARN_ON(err);
 576         }
 577
 578 out:
 579         mutex_unlock(&inode->i_mutex);
 580         dput(dentry);
 581         return ret;
 582 }
 583
 584
 585 static struct file_system_type spufs_type;
 586
 587 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
 588                                                         struct file *filp)
 589 {
 590         struct dentry *dentry;
 591         int ret;
 592
 593         ret = -EINVAL;
 594         /* check if we are on spufs */
 595         if (nd->path.dentry->d_sb->s_type != &spufs_type)
 596                 goto out;
 597
 598         /* don't accept undefined flags */
 599         if (flags & (~SPU_CREATE_FLAG_ALL))
 600                 goto out;
 601
 602         /* only threads can be underneath a gang */
 603         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
 604                 if ((flags & SPU_CREATE_GANG) ||
 605                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
 606                         goto out;
 607         }
 608
 609         dentry = lookup_create(nd, 1);
 610         ret = PTR_ERR(dentry);
 611         if (IS_ERR(dentry))
 612                 goto out_dir;
 613
 614         ret = -EEXIST;
 615         if (dentry->d_inode)
 616                 goto out_dput;
 617
 618         mode &= ~current->fs->umask;
 619
 620         if (flags & SPU_CREATE_GANG)
 621                 return spufs_create_gang(nd->path.dentry->d_inode,
 622                                          dentry, nd->path.mnt, mode);
 623         else
 624                 return spufs_create_context(nd->path.dentry->d_inode,
 625                                             dentry, nd->path.mnt, flags, mode,
 626                                             filp);
 627
 628 out_dput:
 629         dput(dentry);
 630 out_dir:
 631         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
 632 out:
 633         return ret;
 634 }
 635
 636 /* File system initialization */
 637 enum {
 638         Opt_uid, Opt_gid, Opt_mode, Opt_err,
 639 };
 640
 641 static match_table_t spufs_tokens = {
 642         { Opt_uid,  "uid=%d" },
 643         { Opt_gid,  "gid=%d" },
 644         { Opt_mode, "mode=%o" },
 645         { Opt_err,   NULL  },
 646 };
 647
 648 static int
 649 spufs_parse_options(char *options, struct inode *root)
 650 {
 651         char *p;
 652         substring_t args[MAX_OPT_ARGS];
 653
 654         while ((p = strsep(&options, ",")) != NULL) {
 655                 int token, option;
 656
 657                 if (!*p)
 658                         continue;
 659
 660                 token = match_token(p, spufs_tokens, args);
 661                 switch (token) {
 662                 case Opt_uid:
 663                         if (match_int(&args[0], &option))
 664                                 return 0;
 665                         root->i_uid = option;
 666                         break;
 667                 case Opt_gid:
 668                         if (match_int(&args[0], &option))
 669                                 return 0;
 670                         root->i_gid = option;
 671                         break;
 672                 case Opt_mode:
 673                         if (match_octal(&args[0], &option))
 674                                 return 0;
 675                         root->i_mode = option | S_IFDIR;
 676                         break;
 677                 default:
 678                         return 0;
 679                 }
 680         }
 681         return 1;
 682 }
 683
 684 static void spufs_exit_isolated_loader(void)
 685 {
 686         free_pages((unsigned long) isolated_loader,
 687                         get_order(isolated_loader_size));
 688 }
 689
 690 static void
 691 spufs_init_isolated_loader(void)
 692 {
 693         struct device_node *dn;
 694         const char *loader;
 695         int size;
 696
 697         dn = of_find_node_by_path("/spu-isolation");
 698         if (!dn)
 699                 return;
 700
 701         loader = of_get_property(dn, "loader", &size);
 702         if (!loader)
 703                 return;
 704
 705         /* the loader must be align on a 16 byte boundary */
 706         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 707         if (!isolated_loader)
 708                 return;
 709
 710         isolated_loader_size = size;
 711         memcpy(isolated_loader, loader, size);
 712         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 713 }
 714
 715 static int
 716 spufs_create_root(struct super_block *sb, void *data)
 717 {
 718         struct inode *inode;
 719         int ret;
 720
 721         ret = -ENODEV;
 722         if (!spu_management_ops)
 723                 goto out;
 724
 725         ret = -ENOMEM;
 726         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 727         if (!inode)
 728                 goto out;
 729
 730         inode->i_op = &simple_dir_inode_operations;
 731         inode->i_fop = &simple_dir_operations;
 732         SPUFS_I(inode)->i_ctx = NULL;
 733
 734         ret = -EINVAL;
 735         if (!spufs_parse_options(data, inode))
 736                 goto out_iput;
 737
 738         ret = -ENOMEM;
 739         sb->s_root = d_alloc_root(inode);
 740         if (!sb->s_root)
 741                 goto out_iput;
 742
 743         return 0;
 744 out_iput:
 745         iput(inode);
 746 out:
 747         return ret;
 748 }
 749
 750 static int
 751 spufs_fill_super(struct super_block *sb, void *data, int silent)
 752 {
 753         static struct super_operations s_ops = {
 754                 .alloc_inode = spufs_alloc_inode,
 755                 .destroy_inode = spufs_destroy_inode,
 756                 .statfs = simple_statfs,
 757                 .delete_inode = spufs_delete_inode,
 758                 .drop_inode = generic_delete_inode,
 759                 .show_options = generic_show_options,
 760         };
 761
 762         save_mount_options(sb, data);
 763
 764         sb->s_maxbytes = MAX_LFS_FILESIZE;
 765         sb->s_blocksize = PAGE_CACHE_SIZE;
 766         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 767         sb->s_magic = SPUFS_MAGIC;
 768         sb->s_op = &s_ops;
 769
 770         return spufs_create_root(sb, data);
 771 }
 772
 773 static int
 774 spufs_get_sb(struct file_system_type *fstype, int flags,
 775                 const char *name, void *data, struct vfsmount *mnt)
 776 {
 777         return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
 778 }
 779
 780 static struct file_system_type spufs_type = {
 781         .owner = THIS_MODULE,
 782         .name = "spufs",
 783         .get_sb = spufs_get_sb,
 784         .kill_sb = kill_litter_super,
 785 };
 786
 787 static int __init spufs_init(void)
 788 {
 789         int ret;
 790
 791         ret = -ENODEV;
 792         if (!spu_management_ops)
 793                 goto out;
 794
 795         ret = -ENOMEM;
 796         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 797                         sizeof(struct spufs_inode_info), 0,
 798                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 799
 800         if (!spufs_inode_cache)
 801                 goto out;
 802         ret = spu_sched_init();
 803         if (ret)
 804                 goto out_cache;
 805         ret = register_filesystem(&spufs_type);
 806         if (ret)
 807                 goto out_sched;
 808         ret = register_spu_syscalls(&spufs_calls);
 809         if (ret)
 810                 goto out_fs;
 811
 812         spufs_init_isolated_loader();
 813
 814         return 0;
 815
 816 out_fs:
 817         unregister_filesystem(&spufs_type);
 818 out_sched:
 819         spu_sched_exit();
 820 out_cache:
 821         kmem_cache_destroy(spufs_inode_cache);
 822 out:
 823         return ret;
 824 }
 825 module_init(spufs_init);
 826
 827 static void __exit spufs_exit(void)
 828 {
 829         spu_sched_exit();
 830         spufs_exit_isolated_loader();
 831         unregister_spu_syscalls(&spufs_calls);
 832         unregister_filesystem(&spufs_type);
 833         kmem_cache_destroy(spufs_inode_cache);
 834 }
 835 module_exit(spufs_exit);
 836
 837 MODULE_LICENSE("GPL");
 838 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 839