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         end_writeback(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         spufs_prune_dir(dir);
 190         d_drop(dir);
 191
 192         return simple_rmdir(parent, dir);
 193 }
 194
 195 static int spufs_fill_dir(struct dentry *dir,
 196                 const struct spufs_tree_descr *files, umode_t mode,
 197                 struct spu_context *ctx)
 198 {
 199         struct dentry *dentry, *tmp;
 200         int ret;
 201
 202         while (files->name && files->name[0]) {
 203                 ret = -ENOMEM;
 204                 dentry = d_alloc_name(dir, files->name);
 205                 if (!dentry)
 206                         goto out;
 207                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 208                                         files->mode & mode, files->size, ctx);
 209                 if (ret)
 210                         goto out;
 211                 files++;
 212         }
 213         return 0;
 214 out:
 215         /*
 216          * remove all children from dir. dir->inode is not set so don't
 217          * just simply use spufs_prune_dir() and panic afterwards :)
 218          * dput() looks like it will do the right thing:
 219          * - dec parent's ref counter
 220          * - remove child from parent's child list
 221          * - free child's inode if possible
 222          * - free child
 223          */
 224         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 225                 dput(dentry);
 226         }
 227
 228         shrink_dcache_parent(dir);
 229         return ret;
 230 }
 231
 232 static int spufs_dir_close(struct inode *inode, struct file *file)
 233 {
 234         struct spu_context *ctx;
 235         struct inode *parent;
 236         struct dentry *dir;
 237         int ret;
 238
 239         dir = file->f_path.dentry;
 240         parent = dir->d_parent->d_inode;
 241         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 242
 243         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
 244         ret = spufs_rmdir(parent, dir);
 245         mutex_unlock(&parent->i_mutex);
 246         WARN_ON(ret);
 247
 248         /* We have to give up the mm_struct */
 249         spu_forget(ctx);
 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 dentry *dentry, struct vfsmount *mnt)
 321 {
 322         int ret;
 323         struct file *filp;
 324
 325         ret = get_unused_fd();
 326         if (ret < 0) {
 327                 dput(dentry);
 328                 mntput(mnt);
 329                 goto out;
 330         }
 331
 332         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 333         if (IS_ERR(filp)) {
 334                 put_unused_fd(ret);
 335                 ret = PTR_ERR(filp);
 336                 goto out;
 337         }
 338
 339         filp->f_op = &spufs_context_fops;
 340         fd_install(ret, filp);
 341 out:
 342         return ret;
 343 }
 344
 345 static struct spu_context *
 346 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 347                                                 struct file *filp)
 348 {
 349         struct spu_context *tmp, *neighbor, *err;
 350         int count, node;
 351         int aff_supp;
 352
 353         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 354                                         struct spu, cbe_list))->aff_list);
 355
 356         if (!aff_supp)
 357                 return ERR_PTR(-EINVAL);
 358
 359         if (flags & SPU_CREATE_GANG)
 360                 return ERR_PTR(-EINVAL);
 361
 362         if (flags & SPU_CREATE_AFFINITY_MEM &&
 363             gang->aff_ref_ctx &&
 364             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 365                 return ERR_PTR(-EEXIST);
 366
 367         if (gang->aff_flags & AFF_MERGED)
 368                 return ERR_PTR(-EBUSY);
 369
 370         neighbor = NULL;
 371         if (flags & SPU_CREATE_AFFINITY_SPU) {
 372                 if (!filp || filp->f_op != &spufs_context_fops)
 373                         return ERR_PTR(-EINVAL);
 374
 375                 neighbor = get_spu_context(
 376                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
 377
 378                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 379                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 380                     !list_entry(neighbor->aff_list.next, struct spu_context,
 381                     aff_list)->aff_head) {
 382                         err = ERR_PTR(-EEXIST);
 383                         goto out_put_neighbor;
 384                 }
 385
 386                 if (gang != neighbor->gang) {
 387                         err = ERR_PTR(-EINVAL);
 388                         goto out_put_neighbor;
 389                 }
 390
 391                 count = 1;
 392                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 393                         count++;
 394                 if (list_empty(&neighbor->aff_list))
 395                         count++;
 396
 397                 for (node = 0; node < MAX_NUMNODES; node++) {
 398                         if ((cbe_spu_info[node].n_spus - atomic_read(
 399                                 &cbe_spu_info[node].reserved_spus)) >= count)
 400                                 break;
 401                 }
 402
 403                 if (node == MAX_NUMNODES) {
 404                         err = ERR_PTR(-EEXIST);
 405                         goto out_put_neighbor;
 406                 }
 407         }
 408
 409         return neighbor;
 410
 411 out_put_neighbor:
 412         put_spu_context(neighbor);
 413         return err;
 414 }
 415
 416 static void
 417 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 418                                         struct spu_context *neighbor)
 419 {
 420         if (flags & SPU_CREATE_AFFINITY_MEM)
 421                 ctx->gang->aff_ref_ctx = ctx;
 422
 423         if (flags & SPU_CREATE_AFFINITY_SPU) {
 424                 if (list_empty(&neighbor->aff_list)) {
 425                         list_add_tail(&neighbor->aff_list,
 426                                 &ctx->gang->aff_list_head);
 427                         neighbor->aff_head = 1;
 428                 }
 429
 430                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 431                     || list_entry(neighbor->aff_list.next, struct spu_context,
 432                                                         aff_list)->aff_head) {
 433                         list_add(&ctx->aff_list, &neighbor->aff_list);
 434                 } else  {
 435                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 436                         if (neighbor->aff_head) {
 437                                 neighbor->aff_head = 0;
 438                                 ctx->aff_head = 1;
 439                         }
 440                 }
 441
 442                 if (!ctx->gang->aff_ref_ctx)
 443                         ctx->gang->aff_ref_ctx = ctx;
 444         }
 445 }
 446
 447 static int
 448 spufs_create_context(struct inode *inode, struct dentry *dentry,
 449                         struct vfsmount *mnt, int flags, umode_t mode,
 450                         struct file *aff_filp)
 451 {
 452         int ret;
 453         int affinity;
 454         struct spu_gang *gang;
 455         struct spu_context *neighbor;
 456
 457         ret = -EPERM;
 458         if ((flags & SPU_CREATE_NOSCHED) &&
 459             !capable(CAP_SYS_NICE))
 460                 goto out_unlock;
 461
 462         ret = -EINVAL;
 463         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 464             == SPU_CREATE_ISOLATE)
 465                 goto out_unlock;
 466
 467         ret = -ENODEV;
 468         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 469                 goto out_unlock;
 470
 471         gang = NULL;
 472         neighbor = NULL;
 473         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 474         if (affinity) {
 475                 gang = SPUFS_I(inode)->i_gang;
 476                 ret = -EINVAL;
 477                 if (!gang)
 478                         goto out_unlock;
 479                 mutex_lock(&gang->aff_mutex);
 480                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 481                 if (IS_ERR(neighbor)) {
 482                         ret = PTR_ERR(neighbor);
 483                         goto out_aff_unlock;
 484                 }
 485         }
 486
 487         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 488         if (ret)
 489                 goto out_aff_unlock;
 490
 491         if (affinity) {
 492                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 493                                                                 neighbor);
 494                 if (neighbor)
 495                         put_spu_context(neighbor);
 496         }
 497
 498         /*
 499          * get references for dget and mntget, will be released
 500          * in error path of *_open().
 501          */
 502         ret = spufs_context_open(dget(dentry), mntget(mnt));
 503         if (ret < 0) {
 504                 WARN_ON(spufs_rmdir(inode, dentry));
 505                 if (affinity)
 506                         mutex_unlock(&gang->aff_mutex);
 507                 mutex_unlock(&inode->i_mutex);
 508                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 509                 goto out;
 510         }
 511
 512 out_aff_unlock:
 513         if (affinity)
 514                 mutex_unlock(&gang->aff_mutex);
 515 out_unlock:
 516         mutex_unlock(&inode->i_mutex);
 517 out:
 518         dput(dentry);
 519         return ret;
 520 }
 521
 522 static int
 523 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
 524 {
 525         int ret;
 526         struct inode *inode;
 527         struct spu_gang *gang;
 528
 529         ret = -ENOSPC;
 530         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 531         if (!inode)
 532                 goto out;
 533
 534         ret = 0;
 535         if (dir->i_mode & S_ISGID) {
 536                 inode->i_gid = dir->i_gid;
 537                 inode->i_mode &= S_ISGID;
 538         }
 539         gang = alloc_spu_gang();
 540         SPUFS_I(inode)->i_ctx = NULL;
 541         SPUFS_I(inode)->i_gang = gang;
 542         if (!gang)
 543                 goto out_iput;
 544
 545         inode->i_op = &simple_dir_inode_operations;
 546         inode->i_fop = &simple_dir_operations;
 547
 548         d_instantiate(dentry, inode);
 549         inc_nlink(dir);
 550         inc_nlink(dentry->d_inode);
 551         return ret;
 552
 553 out_iput:
 554         iput(inode);
 555 out:
 556         return ret;
 557 }
 558
 559 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 560 {
 561         int ret;
 562         struct file *filp;
 563
 564         ret = get_unused_fd();
 565         if (ret < 0) {
 566                 dput(dentry);
 567                 mntput(mnt);
 568                 goto out;
 569         }
 570
 571         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 572         if (IS_ERR(filp)) {
 573                 put_unused_fd(ret);
 574                 ret = PTR_ERR(filp);
 575                 goto out;
 576         }
 577
 578         filp->f_op = &simple_dir_operations;
 579         fd_install(ret, filp);
 580 out:
 581         return ret;
 582 }
 583
 584 static int spufs_create_gang(struct inode *inode,
 585                         struct dentry *dentry,
 586                         struct vfsmount *mnt, umode_t mode)
 587 {
 588         int ret;
 589
 590         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 591         if (ret)
 592                 goto out;
 593
 594         /*
 595          * get references for dget and mntget, will be released
 596          * in error path of *_open().
 597          */
 598         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 599         if (ret < 0) {
 600                 int err = simple_rmdir(inode, dentry);
 601                 WARN_ON(err);
 602         }
 603
 604 out:
 605         mutex_unlock(&inode->i_mutex);
 606         dput(dentry);
 607         return ret;
 608 }
 609
 610
 611 static struct file_system_type spufs_type;
 612
 613 long spufs_create(struct path *path, struct dentry *dentry,
 614                 unsigned int flags, umode_t mode, struct file *filp)
 615 {
 616         int ret;
 617
 618         ret = -EINVAL;
 619         /* check if we are on spufs */
 620         if (path->dentry->d_sb->s_type != &spufs_type)
 621                 goto out;
 622
 623         /* don't accept undefined flags */
 624         if (flags & (~SPU_CREATE_FLAG_ALL))
 625                 goto out;
 626
 627         /* only threads can be underneath a gang */
 628         if (path->dentry != path->dentry->d_sb->s_root) {
 629                 if ((flags & SPU_CREATE_GANG) ||
 630                     !SPUFS_I(path->dentry->d_inode)->i_gang)
 631                         goto out;
 632         }
 633
 634         mode &= ~current_umask();
 635
 636         if (flags & SPU_CREATE_GANG)
 637                 ret = spufs_create_gang(path->dentry->d_inode,
 638                                          dentry, path->mnt, mode);
 639         else
 640                 ret = spufs_create_context(path->dentry->d_inode,
 641                                             dentry, path->mnt, flags, mode,
 642                                             filp);
 643         if (ret >= 0)
 644                 fsnotify_mkdir(path->dentry->d_inode, dentry);
 645         return ret;
 646
 647 out:
 648         mutex_unlock(&path->dentry->d_inode->i_mutex);
 649         dput(dentry);
 650         return ret;
 651 }
 652
 653 /* File system initialization */
 654 enum {
 655         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 656 };
 657
 658 static const match_table_t spufs_tokens = {
 659         { Opt_uid,   "uid=%d" },
 660         { Opt_gid,   "gid=%d" },
 661         { Opt_mode,  "mode=%o" },
 662         { Opt_debug, "debug" },
 663         { Opt_err,    NULL  },
 664 };
 665
 666 static int
 667 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 668 {
 669         char *p;
 670         substring_t args[MAX_OPT_ARGS];
 671
 672         while ((p = strsep(&options, ",")) != NULL) {
 673                 int token, option;
 674
 675                 if (!*p)
 676                         continue;
 677
 678                 token = match_token(p, spufs_tokens, args);
 679                 switch (token) {
 680                 case Opt_uid:
 681                         if (match_int(&args[0], &option))
 682                                 return 0;
 683                         root->i_uid = option;
 684                         break;
 685                 case Opt_gid:
 686                         if (match_int(&args[0], &option))
 687                                 return 0;
 688                         root->i_gid = option;
 689                         break;
 690                 case Opt_mode:
 691                         if (match_octal(&args[0], &option))
 692                                 return 0;
 693                         root->i_mode = option | S_IFDIR;
 694                         break;
 695                 case Opt_debug:
 696                         spufs_get_sb_info(sb)->debug = 1;
 697                         break;
 698                 default:
 699                         return 0;
 700                 }
 701         }
 702         return 1;
 703 }
 704
 705 static void spufs_exit_isolated_loader(void)
 706 {
 707         free_pages((unsigned long) isolated_loader,
 708                         get_order(isolated_loader_size));
 709 }
 710
 711 static void
 712 spufs_init_isolated_loader(void)
 713 {
 714         struct device_node *dn;
 715         const char *loader;
 716         int size;
 717
 718         dn = of_find_node_by_path("/spu-isolation");
 719         if (!dn)
 720                 return;
 721
 722         loader = of_get_property(dn, "loader", &size);
 723         if (!loader)
 724                 return;
 725
 726         /* the loader must be align on a 16 byte boundary */
 727         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 728         if (!isolated_loader)
 729                 return;
 730
 731         isolated_loader_size = size;
 732         memcpy(isolated_loader, loader, size);
 733         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 734 }
 735
 736 static int
 737 spufs_create_root(struct super_block *sb, void *data)
 738 {
 739         struct inode *inode;
 740         int ret;
 741
 742         ret = -ENODEV;
 743         if (!spu_management_ops)
 744                 goto out;
 745
 746         ret = -ENOMEM;
 747         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 748         if (!inode)
 749                 goto out;
 750
 751         inode->i_op = &simple_dir_inode_operations;
 752         inode->i_fop = &simple_dir_operations;
 753         SPUFS_I(inode)->i_ctx = NULL;
 754         inc_nlink(inode);
 755
 756         ret = -EINVAL;
 757         if (!spufs_parse_options(sb, data, inode))
 758                 goto out_iput;
 759
 760         ret = -ENOMEM;
 761         sb->s_root = d_make_root(inode);
 762         if (!sb->s_root)
 763                 goto out;
 764
 765         return 0;
 766 out_iput:
 767         iput(inode);
 768 out:
 769         return ret;
 770 }
 771
 772 static int
 773 spufs_fill_super(struct super_block *sb, void *data, int silent)
 774 {
 775         struct spufs_sb_info *info;
 776         static const struct super_operations s_ops = {
 777                 .alloc_inode = spufs_alloc_inode,
 778                 .destroy_inode = spufs_destroy_inode,
 779                 .statfs = simple_statfs,
 780                 .evict_inode = spufs_evict_inode,
 781                 .show_options = generic_show_options,
 782         };
 783
 784         save_mount_options(sb, data);
 785
 786         info = kzalloc(sizeof(*info), GFP_KERNEL);
 787         if (!info)
 788                 return -ENOMEM;
 789
 790         sb->s_maxbytes = MAX_LFS_FILESIZE;
 791         sb->s_blocksize = PAGE_CACHE_SIZE;
 792         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 793         sb->s_magic = SPUFS_MAGIC;
 794         sb->s_op = &s_ops;
 795         sb->s_fs_info = info;
 796
 797         return spufs_create_root(sb, data);
 798 }
 799
 800 static struct dentry *
 801 spufs_mount(struct file_system_type *fstype, int flags,
 802                 const char *name, void *data)
 803 {
 804         return mount_single(fstype, flags, data, spufs_fill_super);
 805 }
 806
 807 static struct file_system_type spufs_type = {
 808         .owner = THIS_MODULE,
 809         .name = "spufs",
 810         .mount = spufs_mount,
 811         .kill_sb = kill_litter_super,
 812 };
 813
 814 static int __init spufs_init(void)
 815 {
 816         int ret;
 817
 818         ret = -ENODEV;
 819         if (!spu_management_ops)
 820                 goto out;
 821
 822         ret = -ENOMEM;
 823         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 824                         sizeof(struct spufs_inode_info), 0,
 825                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 826
 827         if (!spufs_inode_cache)
 828                 goto out;
 829         ret = spu_sched_init();
 830         if (ret)
 831                 goto out_cache;
 832         ret = register_spu_syscalls(&spufs_calls);
 833         if (ret)
 834                 goto out_sched;
 835         ret = register_filesystem(&spufs_type);
 836         if (ret)
 837                 goto out_syscalls;
 838
 839         spufs_init_isolated_loader();
 840
 841         return 0;
 842
 843 out_syscalls:
 844         unregister_spu_syscalls(&spufs_calls);
 845 out_sched:
 846         spu_sched_exit();
 847 out_cache:
 848         kmem_cache_destroy(spufs_inode_cache);
 849 out:
 850         return ret;
 851 }
 852 module_init(spufs_init);
 853
 854 static void __exit spufs_exit(void)
 855 {
 856         spu_sched_exit();
 857         spufs_exit_isolated_loader();
 858         unregister_spu_syscalls(&spufs_calls);
 859         unregister_filesystem(&spufs_type);
 860         kmem_cache_destroy(spufs_inode_cache);
 861 }
 862 module_exit(spufs_exit);
 863
 864 MODULE_LICENSE("GPL");
 865 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 866