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