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
  75 spufs_destroy_inode(struct inode *inode)
  76 {
  77         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
  78 }
  79
  80 static void
  81 spufs_init_once(void *p)
  82 {
  83         struct spufs_inode_info *ei = p;
  84
  85         inode_init_once(&ei->vfs_inode);
  86 }
  87
  88 static struct inode *
  89 spufs_new_inode(struct super_block *sb, int mode)
  90 {
  91         struct inode *inode;
  92
  93         inode = new_inode(sb);
  94         if (!inode)
  95                 goto out;
  96
  97         inode->i_mode = mode;
  98         inode->i_uid = current_fsuid();
  99         inode->i_gid = current_fsgid();
 100         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 101 out:
 102         return inode;
 103 }
 104
 105 static int
 106 spufs_setattr(struct dentry *dentry, struct iattr *attr)
 107 {
 108         struct inode *inode = dentry->d_inode;
 109
 110         if ((attr->ia_valid & ATTR_SIZE) &&
 111             (attr->ia_size != inode->i_size))
 112                 return -EINVAL;
 113         setattr_copy(inode, attr);
 114         mark_inode_dirty(inode);
 115         return 0;
 116 }
 117
 118
 119 static int
 120 spufs_new_file(struct super_block *sb, struct dentry *dentry,
 121                 const struct file_operations *fops, int mode,
 122                 size_t size, struct spu_context *ctx)
 123 {
 124         static const struct inode_operations spufs_file_iops = {
 125                 .setattr = spufs_setattr,
 126         };
 127         struct inode *inode;
 128         int ret;
 129
 130         ret = -ENOSPC;
 131         inode = spufs_new_inode(sb, S_IFREG | mode);
 132         if (!inode)
 133                 goto out;
 134
 135         ret = 0;
 136         inode->i_op = &spufs_file_iops;
 137         inode->i_fop = fops;
 138         inode->i_size = size;
 139         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 140         d_add(dentry, inode);
 141 out:
 142         return ret;
 143 }
 144
 145 static void
 146 spufs_evict_inode(struct inode *inode)
 147 {
 148         struct spufs_inode_info *ei = SPUFS_I(inode);
 149         end_writeback(inode);
 150         if (ei->i_ctx)
 151                 put_spu_context(ei->i_ctx);
 152         if (ei->i_gang)
 153                 put_spu_gang(ei->i_gang);
 154 }
 155
 156 static void spufs_prune_dir(struct dentry *dir)
 157 {
 158         struct dentry *dentry, *tmp;
 159
 160         mutex_lock(&dir->d_inode->i_mutex);
 161         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 162                 spin_lock(&dentry->d_lock);
 163                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
 164                         dget_locked_dlock(dentry);
 165                         __d_drop(dentry);
 166                         spin_unlock(&dentry->d_lock);
 167                         simple_unlink(dir->d_inode, dentry);
 168                         /* XXX: what was dcache_lock protecting here? Other
 169                          * filesystems (IB, configfs) release dcache_lock
 170                          * before unlink */
 171                         dput(dentry);
 172                 } else {
 173                         spin_unlock(&dentry->d_lock);
 174                 }
 175         }
 176         shrink_dcache_parent(dir);
 177         mutex_unlock(&dir->d_inode->i_mutex);
 178 }
 179
 180 /* Caller must hold parent->i_mutex */
 181 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 182 {
 183         /* remove all entries */
 184         spufs_prune_dir(dir);
 185         d_drop(dir);
 186
 187         return simple_rmdir(parent, dir);
 188 }
 189
 190 static int spufs_fill_dir(struct dentry *dir,
 191                 const struct spufs_tree_descr *files, int mode,
 192                 struct spu_context *ctx)
 193 {
 194         struct dentry *dentry, *tmp;
 195         int ret;
 196
 197         while (files->name && files->name[0]) {
 198                 ret = -ENOMEM;
 199                 dentry = d_alloc_name(dir, files->name);
 200                 if (!dentry)
 201                         goto out;
 202                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 203                                         files->mode & mode, files->size, ctx);
 204                 if (ret)
 205                         goto out;
 206                 files++;
 207         }
 208         return 0;
 209 out:
 210         /*
 211          * remove all children from dir. dir->inode is not set so don't
 212          * just simply use spufs_prune_dir() and panic afterwards :)
 213          * dput() looks like it will do the right thing:
 214          * - dec parent's ref counter
 215          * - remove child from parent's child list
 216          * - free child's inode if possible
 217          * - free child
 218          */
 219         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 220                 dput(dentry);
 221         }
 222
 223         shrink_dcache_parent(dir);
 224         return ret;
 225 }
 226
 227 static int spufs_dir_close(struct inode *inode, struct file *file)
 228 {
 229         struct spu_context *ctx;
 230         struct inode *parent;
 231         struct dentry *dir;
 232         int ret;
 233
 234         dir = file->f_path.dentry;
 235         parent = dir->d_parent->d_inode;
 236         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 237
 238         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
 239         ret = spufs_rmdir(parent, dir);
 240         mutex_unlock(&parent->i_mutex);
 241         WARN_ON(ret);
 242
 243         /* We have to give up the mm_struct */
 244         spu_forget(ctx);
 245
 246         return dcache_dir_close(inode, file);
 247 }
 248
 249 const struct file_operations spufs_context_fops = {
 250         .open           = dcache_dir_open,
 251         .release        = spufs_dir_close,
 252         .llseek         = dcache_dir_lseek,
 253         .read           = generic_read_dir,
 254         .readdir        = dcache_readdir,
 255         .fsync          = noop_fsync,
 256 };
 257 EXPORT_SYMBOL_GPL(spufs_context_fops);
 258
 259 static int
 260 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 261                 int mode)
 262 {
 263         int ret;
 264         struct inode *inode;
 265         struct spu_context *ctx;
 266
 267         ret = -ENOSPC;
 268         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 269         if (!inode)
 270                 goto out;
 271
 272         if (dir->i_mode & S_ISGID) {
 273                 inode->i_gid = dir->i_gid;
 274                 inode->i_mode &= S_ISGID;
 275         }
 276         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 277         SPUFS_I(inode)->i_ctx = ctx;
 278         if (!ctx)
 279                 goto out_iput;
 280
 281         ctx->flags = flags;
 282         inode->i_op = &simple_dir_inode_operations;
 283         inode->i_fop = &simple_dir_operations;
 284         if (flags & SPU_CREATE_NOSCHED)
 285                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 286                                          mode, ctx);
 287         else
 288                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 289
 290         if (ret)
 291                 goto out_free_ctx;
 292
 293         if (spufs_get_sb_info(dir->i_sb)->debug)
 294                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 295                                 mode, ctx);
 296
 297         if (ret)
 298                 goto out_free_ctx;
 299
 300         d_instantiate(dentry, inode);
 301         dget(dentry);
 302         inc_nlink(dir);
 303         inc_nlink(dentry->d_inode);
 304         goto out;
 305
 306 out_free_ctx:
 307         spu_forget(ctx);
 308         put_spu_context(ctx);
 309 out_iput:
 310         iput(inode);
 311 out:
 312         return ret;
 313 }
 314
 315 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 316 {
 317         int ret;
 318         struct file *filp;
 319
 320         ret = get_unused_fd();
 321         if (ret < 0) {
 322                 dput(dentry);
 323                 mntput(mnt);
 324                 goto out;
 325         }
 326
 327         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 328         if (IS_ERR(filp)) {
 329                 put_unused_fd(ret);
 330                 ret = PTR_ERR(filp);
 331                 goto out;
 332         }
 333
 334         filp->f_op = &spufs_context_fops;
 335         fd_install(ret, filp);
 336 out:
 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, int mode,
 445                         struct file *aff_filp)
 446 {
 447         int ret;
 448         int affinity;
 449         struct spu_gang *gang;
 450         struct spu_context *neighbor;
 451
 452         ret = -EPERM;
 453         if ((flags & SPU_CREATE_NOSCHED) &&
 454             !capable(CAP_SYS_NICE))
 455                 goto out_unlock;
 456
 457         ret = -EINVAL;
 458         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 459             == SPU_CREATE_ISOLATE)
 460                 goto out_unlock;
 461
 462         ret = -ENODEV;
 463         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 464                 goto out_unlock;
 465
 466         gang = NULL;
 467         neighbor = NULL;
 468         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 469         if (affinity) {
 470                 gang = SPUFS_I(inode)->i_gang;
 471                 ret = -EINVAL;
 472                 if (!gang)
 473                         goto out_unlock;
 474                 mutex_lock(&gang->aff_mutex);
 475                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 476                 if (IS_ERR(neighbor)) {
 477                         ret = PTR_ERR(neighbor);
 478                         goto out_aff_unlock;
 479                 }
 480         }
 481
 482         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 483         if (ret)
 484                 goto out_aff_unlock;
 485
 486         if (affinity) {
 487                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 488                                                                 neighbor);
 489                 if (neighbor)
 490                         put_spu_context(neighbor);
 491         }
 492
 493         /*
 494          * get references for dget and mntget, will be released
 495          * in error path of *_open().
 496          */
 497         ret = spufs_context_open(dget(dentry), mntget(mnt));
 498         if (ret < 0) {
 499                 WARN_ON(spufs_rmdir(inode, dentry));
 500                 if (affinity)
 501                         mutex_unlock(&gang->aff_mutex);
 502                 mutex_unlock(&inode->i_mutex);
 503                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 504                 goto out;
 505         }
 506
 507 out_aff_unlock:
 508         if (affinity)
 509                 mutex_unlock(&gang->aff_mutex);
 510 out_unlock:
 511         mutex_unlock(&inode->i_mutex);
 512 out:
 513         dput(dentry);
 514         return ret;
 515 }
 516
 517 static int
 518 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
 519 {
 520         int ret;
 521         struct inode *inode;
 522         struct spu_gang *gang;
 523
 524         ret = -ENOSPC;
 525         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 526         if (!inode)
 527                 goto out;
 528
 529         ret = 0;
 530         if (dir->i_mode & S_ISGID) {
 531                 inode->i_gid = dir->i_gid;
 532                 inode->i_mode &= S_ISGID;
 533         }
 534         gang = alloc_spu_gang();
 535         SPUFS_I(inode)->i_ctx = NULL;
 536         SPUFS_I(inode)->i_gang = gang;
 537         if (!gang)
 538                 goto out_iput;
 539
 540         inode->i_op = &simple_dir_inode_operations;
 541         inode->i_fop = &simple_dir_operations;
 542
 543         d_instantiate(dentry, inode);
 544         inc_nlink(dir);
 545         inc_nlink(dentry->d_inode);
 546         return ret;
 547
 548 out_iput:
 549         iput(inode);
 550 out:
 551         return ret;
 552 }
 553
 554 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 555 {
 556         int ret;
 557         struct file *filp;
 558
 559         ret = get_unused_fd();
 560         if (ret < 0) {
 561                 dput(dentry);
 562                 mntput(mnt);
 563                 goto out;
 564         }
 565
 566         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 567         if (IS_ERR(filp)) {
 568                 put_unused_fd(ret);
 569                 ret = PTR_ERR(filp);
 570                 goto out;
 571         }
 572
 573         filp->f_op = &simple_dir_operations;
 574         fd_install(ret, filp);
 575 out:
 576         return ret;
 577 }
 578
 579 static int spufs_create_gang(struct inode *inode,
 580                         struct dentry *dentry,
 581                         struct vfsmount *mnt, int mode)
 582 {
 583         int ret;
 584
 585         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 586         if (ret)
 587                 goto out;
 588
 589         /*
 590          * get references for dget and mntget, will be released
 591          * in error path of *_open().
 592          */
 593         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 594         if (ret < 0) {
 595                 int err = simple_rmdir(inode, dentry);
 596                 WARN_ON(err);
 597         }
 598
 599 out:
 600         mutex_unlock(&inode->i_mutex);
 601         dput(dentry);
 602         return ret;
 603 }
 604
 605
 606 static struct file_system_type spufs_type;
 607
 608 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
 609                                                         struct file *filp)
 610 {
 611         struct dentry *dentry;
 612         int ret;
 613
 614         ret = -EINVAL;
 615         /* check if we are on spufs */
 616         if (nd->path.dentry->d_sb->s_type != &spufs_type)
 617                 goto out;
 618
 619         /* don't accept undefined flags */
 620         if (flags & (~SPU_CREATE_FLAG_ALL))
 621                 goto out;
 622
 623         /* only threads can be underneath a gang */
 624         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
 625                 if ((flags & SPU_CREATE_GANG) ||
 626                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
 627                         goto out;
 628         }
 629
 630         dentry = lookup_create(nd, 1);
 631         ret = PTR_ERR(dentry);
 632         if (IS_ERR(dentry))
 633                 goto out_dir;
 634
 635         mode &= ~current_umask();
 636
 637         if (flags & SPU_CREATE_GANG)
 638                 ret = spufs_create_gang(nd->path.dentry->d_inode,
 639                                          dentry, nd->path.mnt, mode);
 640         else
 641                 ret = spufs_create_context(nd->path.dentry->d_inode,
 642                                             dentry, nd->path.mnt, flags, mode,
 643                                             filp);
 644         if (ret >= 0)
 645                 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
 646         return ret;
 647
 648 out_dir:
 649         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
 650 out:
 651         return ret;
 652 }
 653
 654 /* File system initialization */
 655 enum {
 656         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 657 };
 658
 659 static const match_table_t spufs_tokens = {
 660         { Opt_uid,   "uid=%d" },
 661         { Opt_gid,   "gid=%d" },
 662         { Opt_mode,  "mode=%o" },
 663         { Opt_debug, "debug" },
 664         { Opt_err,    NULL  },
 665 };
 666
 667 static int
 668 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 669 {
 670         char *p;
 671         substring_t args[MAX_OPT_ARGS];
 672
 673         while ((p = strsep(&options, ",")) != NULL) {
 674                 int token, option;
 675
 676                 if (!*p)
 677                         continue;
 678
 679                 token = match_token(p, spufs_tokens, args);
 680                 switch (token) {
 681                 case Opt_uid:
 682                         if (match_int(&args[0], &option))
 683                                 return 0;
 684                         root->i_uid = option;
 685                         break;
 686                 case Opt_gid:
 687                         if (match_int(&args[0], &option))
 688                                 return 0;
 689                         root->i_gid = option;
 690                         break;
 691                 case Opt_mode:
 692                         if (match_octal(&args[0], &option))
 693                                 return 0;
 694                         root->i_mode = option | S_IFDIR;
 695                         break;
 696                 case Opt_debug:
 697                         spufs_get_sb_info(sb)->debug = 1;
 698                         break;
 699                 default:
 700                         return 0;
 701                 }
 702         }
 703         return 1;
 704 }
 705
 706 static void spufs_exit_isolated_loader(void)
 707 {
 708         free_pages((unsigned long) isolated_loader,
 709                         get_order(isolated_loader_size));
 710 }
 711
 712 static void
 713 spufs_init_isolated_loader(void)
 714 {
 715         struct device_node *dn;
 716         const char *loader;
 717         int size;
 718
 719         dn = of_find_node_by_path("/spu-isolation");
 720         if (!dn)
 721                 return;
 722
 723         loader = of_get_property(dn, "loader", &size);
 724         if (!loader)
 725                 return;
 726
 727         /* the loader must be align on a 16 byte boundary */
 728         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 729         if (!isolated_loader)
 730                 return;
 731
 732         isolated_loader_size = size;
 733         memcpy(isolated_loader, loader, size);
 734         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 735 }
 736
 737 static int
 738 spufs_create_root(struct super_block *sb, void *data)
 739 {
 740         struct inode *inode;
 741         int ret;
 742
 743         ret = -ENODEV;
 744         if (!spu_management_ops)
 745                 goto out;
 746
 747         ret = -ENOMEM;
 748         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 749         if (!inode)
 750                 goto out;
 751
 752         inode->i_op = &simple_dir_inode_operations;
 753         inode->i_fop = &simple_dir_operations;
 754         SPUFS_I(inode)->i_ctx = NULL;
 755         inc_nlink(inode);
 756
 757         ret = -EINVAL;
 758         if (!spufs_parse_options(sb, data, inode))
 759                 goto out_iput;
 760
 761         ret = -ENOMEM;
 762         sb->s_root = d_alloc_root(inode);
 763         if (!sb->s_root)
 764                 goto out_iput;
 765
 766         return 0;
 767 out_iput:
 768         iput(inode);
 769 out:
 770         return ret;
 771 }
 772
 773 static int
 774 spufs_fill_super(struct super_block *sb, void *data, int silent)
 775 {
 776         struct spufs_sb_info *info;
 777         static const struct super_operations s_ops = {
 778                 .alloc_inode = spufs_alloc_inode,
 779                 .destroy_inode = spufs_destroy_inode,
 780                 .statfs = simple_statfs,
 781                 .evict_inode = spufs_evict_inode,
 782                 .show_options = generic_show_options,
 783         };
 784
 785         save_mount_options(sb, data);
 786
 787         info = kzalloc(sizeof(*info), GFP_KERNEL);
 788         if (!info)
 789                 return -ENOMEM;
 790
 791         sb->s_maxbytes = MAX_LFS_FILESIZE;
 792         sb->s_blocksize = PAGE_CACHE_SIZE;
 793         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 794         sb->s_magic = SPUFS_MAGIC;
 795         sb->s_op = &s_ops;
 796         sb->s_fs_info = info;
 797
 798         return spufs_create_root(sb, data);
 799 }
 800
 801 static struct dentry *
 802 spufs_mount(struct file_system_type *fstype, int flags,
 803                 const char *name, void *data)
 804 {
 805         return mount_single(fstype, flags, data, spufs_fill_super);
 806 }
 807
 808 static struct file_system_type spufs_type = {
 809         .owner = THIS_MODULE,
 810         .name = "spufs",
 811         .mount = spufs_mount,
 812         .kill_sb = kill_litter_super,
 813 };
 814
 815 static int __init spufs_init(void)
 816 {
 817         int ret;
 818
 819         ret = -ENODEV;
 820         if (!spu_management_ops)
 821                 goto out;
 822
 823         ret = -ENOMEM;
 824         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 825                         sizeof(struct spufs_inode_info), 0,
 826                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 827
 828         if (!spufs_inode_cache)
 829                 goto out;
 830         ret = spu_sched_init();
 831         if (ret)
 832                 goto out_cache;
 833         ret = register_filesystem(&spufs_type);
 834         if (ret)
 835                 goto out_sched;
 836         ret = register_spu_syscalls(&spufs_calls);
 837         if (ret)
 838                 goto out_fs;
 839
 840         spufs_init_isolated_loader();
 841
 842         return 0;
 843
 844 out_fs:
 845         unregister_filesystem(&spufs_type);
 846 out_sched:
 847         spu_sched_exit();
 848 out_cache:
 849         kmem_cache_destroy(spufs_inode_cache);
 850 out:
 851         return ret;
 852 }
 853 module_init(spufs_init);
 854
 855 static void __exit spufs_exit(void)
 856 {
 857         spu_sched_exit();
 858         spufs_exit_isolated_loader();
 859         unregister_spu_syscalls(&spufs_calls);
 860         unregister_filesystem(&spufs_type);
 861         kmem_cache_destroy(spufs_inode_cache);
 862 }
 863 module_exit(spufs_exit);
 864
 865 MODULE_LICENSE("GPL");
 866 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 867