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