kernel/2.6.29.6-aldebaran-rt/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         return inode_setattr(inode, attr);
 114 }
 115
 116
 117 static int
 118 spufs_new_file(struct super_block *sb, struct dentry *dentry,
 119                 const struct file_operations *fops, int mode,
 120                 size_t size, struct spu_context *ctx)
 121 {
 122         static struct inode_operations spufs_file_iops = {
 123                 .setattr = spufs_setattr,
 124         };
 125         struct inode *inode;
 126         int ret;
 127
 128         ret = -ENOSPC;
 129         inode = spufs_new_inode(sb, S_IFREG | mode);
 130         if (!inode)
 131                 goto out;
 132
 133         ret = 0;
 134         inode->i_op = &spufs_file_iops;
 135         inode->i_fop = fops;
 136         inode->i_size = size;
 137         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 138         d_add(dentry, inode);
 139 out:
 140         return ret;
 141 }
 142
 143 static void
 144 spufs_delete_inode(struct inode *inode)
 145 {
 146         struct spufs_inode_info *ei = SPUFS_I(inode);
 147
 148         if (ei->i_ctx)
 149                 put_spu_context(ei->i_ctx);
 150         if (ei->i_gang)
 151                 put_spu_gang(ei->i_gang);
 152         clear_inode(inode);
 153 }
 154
 155 static void spufs_prune_dir(struct dentry *dir)
 156 {
 157         struct dentry *dentry, *tmp;
 158
 159         mutex_lock(&dir->d_inode->i_mutex);
 160         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 161                 spin_lock(&dcache_lock);
 162                 spin_lock(&dentry->d_lock);
 163                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
 164                         dget_locked(dentry);
 165                         __d_drop(dentry);
 166                         spin_unlock(&dentry->d_lock);
 167                         simple_unlink(dir->d_inode, dentry);
 168                         spin_unlock(&dcache_lock);
 169                         dput(dentry);
 170                 } else {
 171                         spin_unlock(&dentry->d_lock);
 172                         spin_unlock(&dcache_lock);
 173                 }
 174         }
 175         shrink_dcache_parent(dir);
 176         mutex_unlock(&dir->d_inode->i_mutex);
 177 }
 178
 179 /* Caller must hold parent->i_mutex */
 180 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 181 {
 182         /* remove all entries */
 183         spufs_prune_dir(dir);
 184         d_drop(dir);
 185
 186         return simple_rmdir(parent, dir);
 187 }
 188
 189 static int spufs_fill_dir(struct dentry *dir, struct spufs_tree_descr *files,
 190                           int mode, struct spu_context *ctx)
 191 {
 192         struct dentry *dentry, *tmp;
 193         int ret;
 194
 195         while (files->name && files->name[0]) {
 196                 ret = -ENOMEM;
 197                 dentry = d_alloc_name(dir, files->name);
 198                 if (!dentry)
 199                         goto out;
 200                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 201                                         files->mode & mode, files->size, ctx);
 202                 if (ret)
 203                         goto out;
 204                 files++;
 205         }
 206         return 0;
 207 out:
 208         /*
 209          * remove all children from dir. dir->inode is not set so don't
 210          * just simply use spufs_prune_dir() and panic afterwards :)
 211          * dput() looks like it will do the right thing:
 212          * - dec parent's ref counter
 213          * - remove child from parent's child list
 214          * - free child's inode if possible
 215          * - free child
 216          */
 217         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 218                 dput(dentry);
 219         }
 220
 221         shrink_dcache_parent(dir);
 222         return ret;
 223 }
 224
 225 static int spufs_dir_close(struct inode *inode, struct file *file)
 226 {
 227         struct spu_context *ctx;
 228         struct inode *parent;
 229         struct dentry *dir;
 230         int ret;
 231
 232         dir = file->f_path.dentry;
 233         parent = dir->d_parent->d_inode;
 234         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 235
 236         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
 237         ret = spufs_rmdir(parent, dir);
 238         mutex_unlock(&parent->i_mutex);
 239         WARN_ON(ret);
 240
 241         /* We have to give up the mm_struct */
 242         spu_forget(ctx);
 243
 244         return dcache_dir_close(inode, file);
 245 }
 246
 247 const struct file_operations spufs_context_fops = {
 248         .open           = dcache_dir_open,
 249         .release        = spufs_dir_close,
 250         .llseek         = dcache_dir_lseek,
 251         .read           = generic_read_dir,
 252         .readdir        = dcache_readdir,
 253         .fsync          = simple_sync_file,
 254 };
 255 EXPORT_SYMBOL_GPL(spufs_context_fops);
 256
 257 static int
 258 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 259                 int mode)
 260 {
 261         int ret;
 262         struct inode *inode;
 263         struct spu_context *ctx;
 264
 265         ret = -ENOSPC;
 266         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 267         if (!inode)
 268                 goto out;
 269
 270         if (dir->i_mode & S_ISGID) {
 271                 inode->i_gid = dir->i_gid;
 272                 inode->i_mode &= S_ISGID;
 273         }
 274         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 275         SPUFS_I(inode)->i_ctx = ctx;
 276         if (!ctx)
 277                 goto out_iput;
 278
 279         ctx->flags = flags;
 280         inode->i_op = &simple_dir_inode_operations;
 281         inode->i_fop = &simple_dir_operations;
 282         if (flags & SPU_CREATE_NOSCHED)
 283                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 284                                          mode, ctx);
 285         else
 286                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 287
 288         if (ret)
 289                 goto out_free_ctx;
 290
 291         if (spufs_get_sb_info(dir->i_sb)->debug)
 292                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 293                                 mode, ctx);
 294
 295         if (ret)
 296                 goto out_free_ctx;
 297
 298         d_instantiate(dentry, inode);
 299         dget(dentry);
 300         inc_nlink(dir);
 301         inc_nlink(dentry->d_inode);
 302         goto out;
 303
 304 out_free_ctx:
 305         spu_forget(ctx);
 306         put_spu_context(ctx);
 307 out_iput:
 308         iput(inode);
 309 out:
 310         return ret;
 311 }
 312
 313 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 314 {
 315         int ret;
 316         struct file *filp;
 317
 318         ret = get_unused_fd();
 319         if (ret < 0) {
 320                 dput(dentry);
 321                 mntput(mnt);
 322                 goto out;
 323         }
 324
 325         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 326         if (IS_ERR(filp)) {
 327                 put_unused_fd(ret);
 328                 ret = PTR_ERR(filp);
 329                 goto out;
 330         }
 331
 332         filp->f_op = &spufs_context_fops;
 333         fd_install(ret, filp);
 334 out:
 335         return ret;
 336 }
 337
 338 static struct spu_context *
 339 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 340                                                 struct file *filp)
 341 {
 342         struct spu_context *tmp, *neighbor, *err;
 343         int count, node;
 344         int aff_supp;
 345
 346         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 347                                         struct spu, cbe_list))->aff_list);
 348
 349         if (!aff_supp)
 350                 return ERR_PTR(-EINVAL);
 351
 352         if (flags & SPU_CREATE_GANG)
 353                 return ERR_PTR(-EINVAL);
 354
 355         if (flags & SPU_CREATE_AFFINITY_MEM &&
 356             gang->aff_ref_ctx &&
 357             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 358                 return ERR_PTR(-EEXIST);
 359
 360         if (gang->aff_flags & AFF_MERGED)
 361                 return ERR_PTR(-EBUSY);
 362
 363         neighbor = NULL;
 364         if (flags & SPU_CREATE_AFFINITY_SPU) {
 365                 if (!filp || filp->f_op != &spufs_context_fops)
 366                         return ERR_PTR(-EINVAL);
 367
 368                 neighbor = get_spu_context(
 369                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
 370
 371                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 372                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 373                     !list_entry(neighbor->aff_list.next, struct spu_context,
 374                     aff_list)->aff_head) {
 375                         err = ERR_PTR(-EEXIST);
 376                         goto out_put_neighbor;
 377                 }
 378
 379                 if (gang != neighbor->gang) {
 380                         err = ERR_PTR(-EINVAL);
 381                         goto out_put_neighbor;
 382                 }
 383
 384                 count = 1;
 385                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 386                         count++;
 387                 if (list_empty(&neighbor->aff_list))
 388                         count++;
 389
 390                 for (node = 0; node < MAX_NUMNODES; node++) {
 391                         if ((cbe_spu_info[node].n_spus - atomic_read(
 392                                 &cbe_spu_info[node].reserved_spus)) >= count)
 393                                 break;
 394                 }
 395
 396                 if (node == MAX_NUMNODES) {
 397                         err = ERR_PTR(-EEXIST);
 398                         goto out_put_neighbor;
 399                 }
 400         }
 401
 402         return neighbor;
 403
 404 out_put_neighbor:
 405         put_spu_context(neighbor);
 406         return err;
 407 }
 408
 409 static void
 410 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 411                                         struct spu_context *neighbor)
 412 {
 413         if (flags & SPU_CREATE_AFFINITY_MEM)
 414                 ctx->gang->aff_ref_ctx = ctx;
 415
 416         if (flags & SPU_CREATE_AFFINITY_SPU) {
 417                 if (list_empty(&neighbor->aff_list)) {
 418                         list_add_tail(&neighbor->aff_list,
 419                                 &ctx->gang->aff_list_head);
 420                         neighbor->aff_head = 1;
 421                 }
 422
 423                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 424                     || list_entry(neighbor->aff_list.next, struct spu_context,
 425                                                         aff_list)->aff_head) {
 426                         list_add(&ctx->aff_list, &neighbor->aff_list);
 427                 } else  {
 428                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 429                         if (neighbor->aff_head) {
 430                                 neighbor->aff_head = 0;
 431                                 ctx->aff_head = 1;
 432                         }
 433                 }
 434
 435                 if (!ctx->gang->aff_ref_ctx)
 436                         ctx->gang->aff_ref_ctx = ctx;
 437         }
 438 }
 439
 440 static int
 441 spufs_create_context(struct inode *inode, struct dentry *dentry,
 442                         struct vfsmount *mnt, int flags, int mode,
 443                         struct file *aff_filp)
 444 {
 445         int ret;
 446         int affinity;
 447         struct spu_gang *gang;
 448         struct spu_context *neighbor;
 449
 450         ret = -EPERM;
 451         if ((flags & SPU_CREATE_NOSCHED) &&
 452             !capable(CAP_SYS_NICE))
 453                 goto out_unlock;
 454
 455         ret = -EINVAL;
 456         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 457             == SPU_CREATE_ISOLATE)
 458                 goto out_unlock;
 459
 460         ret = -ENODEV;
 461         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 462                 goto out_unlock;
 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                 ret = -EINVAL;
 470                 if (!gang)
 471                         goto out_unlock;
 472                 mutex_lock(&gang->aff_mutex);
 473                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 474                 if (IS_ERR(neighbor)) {
 475                         ret = PTR_ERR(neighbor);
 476                         goto out_aff_unlock;
 477                 }
 478         }
 479
 480         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 481         if (ret)
 482                 goto out_aff_unlock;
 483
 484         if (affinity) {
 485                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 486                                                                 neighbor);
 487                 if (neighbor)
 488                         put_spu_context(neighbor);
 489         }
 490
 491         /*
 492          * get references for dget and mntget, will be released
 493          * in error path of *_open().
 494          */
 495         ret = spufs_context_open(dget(dentry), mntget(mnt));
 496         if (ret < 0) {
 497                 WARN_ON(spufs_rmdir(inode, dentry));
 498                 if (affinity)
 499                         mutex_unlock(&gang->aff_mutex);
 500                 mutex_unlock(&inode->i_mutex);
 501                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 502                 goto out;
 503         }
 504
 505 out_aff_unlock:
 506         if (affinity)
 507                 mutex_unlock(&gang->aff_mutex);
 508 out_unlock:
 509         mutex_unlock(&inode->i_mutex);
 510 out:
 511         dput(dentry);
 512         return ret;
 513 }
 514
 515 static int
 516 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
 517 {
 518         int ret;
 519         struct inode *inode;
 520         struct spu_gang *gang;
 521
 522         ret = -ENOSPC;
 523         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 524         if (!inode)
 525                 goto out;
 526
 527         ret = 0;
 528         if (dir->i_mode & S_ISGID) {
 529                 inode->i_gid = dir->i_gid;
 530                 inode->i_mode &= S_ISGID;
 531         }
 532         gang = alloc_spu_gang();
 533         SPUFS_I(inode)->i_ctx = NULL;
 534         SPUFS_I(inode)->i_gang = gang;
 535         if (!gang)
 536                 goto out_iput;
 537
 538         inode->i_op = &simple_dir_inode_operations;
 539         inode->i_fop = &simple_dir_operations;
 540
 541         d_instantiate(dentry, inode);
 542         inc_nlink(dir);
 543         inc_nlink(dentry->d_inode);
 544         return ret;
 545
 546 out_iput:
 547         iput(inode);
 548 out:
 549         return ret;
 550 }
 551
 552 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 553 {
 554         int ret;
 555         struct file *filp;
 556
 557         ret = get_unused_fd();
 558         if (ret < 0) {
 559                 dput(dentry);
 560                 mntput(mnt);
 561                 goto out;
 562         }
 563
 564         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 565         if (IS_ERR(filp)) {
 566                 put_unused_fd(ret);
 567                 ret = PTR_ERR(filp);
 568                 goto out;
 569         }
 570
 571         filp->f_op = &simple_dir_operations;
 572         fd_install(ret, filp);
 573 out:
 574         return ret;
 575 }
 576
 577 static int spufs_create_gang(struct inode *inode,
 578                         struct dentry *dentry,
 579                         struct vfsmount *mnt, int mode)
 580 {
 581         int ret;
 582
 583         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 584         if (ret)
 585                 goto out;
 586
 587         /*
 588          * get references for dget and mntget, will be released
 589          * in error path of *_open().
 590          */
 591         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 592         if (ret < 0) {
 593                 int err = simple_rmdir(inode, dentry);
 594                 WARN_ON(err);
 595         }
 596
 597 out:
 598         mutex_unlock(&inode->i_mutex);
 599         dput(dentry);
 600         return ret;
 601 }
 602
 603
 604 static struct file_system_type spufs_type;
 605
 606 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
 607                                                         struct file *filp)
 608 {
 609         struct dentry *dentry;
 610         int ret;
 611
 612         ret = -EINVAL;
 613         /* check if we are on spufs */
 614         if (nd->path.dentry->d_sb->s_type != &spufs_type)
 615                 goto out;
 616
 617         /* don't accept undefined flags */
 618         if (flags & (~SPU_CREATE_FLAG_ALL))
 619                 goto out;
 620
 621         /* only threads can be underneath a gang */
 622         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
 623                 if ((flags & SPU_CREATE_GANG) ||
 624                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
 625                         goto out;
 626         }
 627
 628         dentry = lookup_create(nd, 1);
 629         ret = PTR_ERR(dentry);
 630         if (IS_ERR(dentry))
 631                 goto out_dir;
 632
 633         ret = -EEXIST;
 634         if (dentry->d_inode)
 635                 goto out_dput;
 636
 637         mode &= ~current->fs->umask;
 638
 639         if (flags & SPU_CREATE_GANG)
 640                 ret = spufs_create_gang(nd->path.dentry->d_inode,
 641                                          dentry, nd->path.mnt, mode);
 642         else
 643                 ret = spufs_create_context(nd->path.dentry->d_inode,
 644                                             dentry, nd->path.mnt, flags, mode,
 645                                             filp);
 646         if (ret >= 0)
 647                 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
 648         return ret;
 649
 650 out_dput:
 651         dput(dentry);
 652 out_dir:
 653         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
 654 out:
 655         return ret;
 656 }
 657
 658 /* File system initialization */
 659 enum {
 660         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 661 };
 662
 663 static const match_table_t spufs_tokens = {
 664         { Opt_uid,   "uid=%d" },
 665         { Opt_gid,   "gid=%d" },
 666         { Opt_mode,  "mode=%o" },
 667         { Opt_debug, "debug" },
 668         { Opt_err,    NULL  },
 669 };
 670
 671 static int
 672 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 673 {
 674         char *p;
 675         substring_t args[MAX_OPT_ARGS];
 676
 677         while ((p = strsep(&options, ",")) != NULL) {
 678                 int token, option;
 679
 680                 if (!*p)
 681                         continue;
 682
 683                 token = match_token(p, spufs_tokens, args);
 684                 switch (token) {
 685                 case Opt_uid:
 686                         if (match_int(&args[0], &option))
 687                                 return 0;
 688                         root->i_uid = option;
 689                         break;
 690                 case Opt_gid:
 691                         if (match_int(&args[0], &option))
 692                                 return 0;
 693                         root->i_gid = option;
 694                         break;
 695                 case Opt_mode:
 696                         if (match_octal(&args[0], &option))
 697                                 return 0;
 698                         root->i_mode = option | S_IFDIR;
 699                         break;
 700                 case Opt_debug:
 701                         spufs_get_sb_info(sb)->debug = 1;
 702                         break;
 703                 default:
 704                         return 0;
 705                 }
 706         }
 707         return 1;
 708 }
 709
 710 static void spufs_exit_isolated_loader(void)
 711 {
 712         free_pages((unsigned long) isolated_loader,
 713                         get_order(isolated_loader_size));
 714 }
 715
 716 static void
 717 spufs_init_isolated_loader(void)
 718 {
 719         struct device_node *dn;
 720         const char *loader;
 721         int size;
 722
 723         dn = of_find_node_by_path("/spu-isolation");
 724         if (!dn)
 725                 return;
 726
 727         loader = of_get_property(dn, "loader", &size);
 728         if (!loader)
 729                 return;
 730
 731         /* the loader must be align on a 16 byte boundary */
 732         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 733         if (!isolated_loader)
 734                 return;
 735
 736         isolated_loader_size = size;
 737         memcpy(isolated_loader, loader, size);
 738         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 739 }
 740
 741 static int
 742 spufs_create_root(struct super_block *sb, void *data)
 743 {
 744         struct inode *inode;
 745         int ret;
 746
 747         ret = -ENODEV;
 748         if (!spu_management_ops)
 749                 goto out;
 750
 751         ret = -ENOMEM;
 752         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 753         if (!inode)
 754                 goto out;
 755
 756         inode->i_op = &simple_dir_inode_operations;
 757         inode->i_fop = &simple_dir_operations;
 758         SPUFS_I(inode)->i_ctx = NULL;
 759         inc_nlink(inode);
 760
 761         ret = -EINVAL;
 762         if (!spufs_parse_options(sb, data, inode))
 763                 goto out_iput;
 764
 765         ret = -ENOMEM;
 766         sb->s_root = d_alloc_root(inode);
 767         if (!sb->s_root)
 768                 goto out_iput;
 769
 770         return 0;
 771 out_iput:
 772         iput(inode);
 773 out:
 774         return ret;
 775 }
 776
 777 static int
 778 spufs_fill_super(struct super_block *sb, void *data, int silent)
 779 {
 780         struct spufs_sb_info *info;
 781         static struct super_operations s_ops = {
 782                 .alloc_inode = spufs_alloc_inode,
 783                 .destroy_inode = spufs_destroy_inode,
 784                 .statfs = simple_statfs,
 785                 .delete_inode = spufs_delete_inode,
 786                 .drop_inode = generic_delete_inode,
 787                 .show_options = generic_show_options,
 788         };
 789
 790         save_mount_options(sb, data);
 791
 792         info = kzalloc(sizeof(*info), GFP_KERNEL);
 793         if (!info)
 794                 return -ENOMEM;
 795
 796         sb->s_maxbytes = MAX_LFS_FILESIZE;
 797         sb->s_blocksize = PAGE_CACHE_SIZE;
 798         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 799         sb->s_magic = SPUFS_MAGIC;
 800         sb->s_op = &s_ops;
 801         sb->s_fs_info = info;
 802
 803         return spufs_create_root(sb, data);
 804 }
 805
 806 static int
 807 spufs_get_sb(struct file_system_type *fstype, int flags,
 808                 const char *name, void *data, struct vfsmount *mnt)
 809 {
 810         return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
 811 }
 812
 813 static struct file_system_type spufs_type = {
 814         .owner = THIS_MODULE,
 815         .name = "spufs",
 816         .get_sb = spufs_get_sb,
 817         .kill_sb = kill_litter_super,
 818 };
 819
 820 static int __init spufs_init(void)
 821 {
 822         int ret;
 823
 824         ret = -ENODEV;
 825         if (!spu_management_ops)
 826                 goto out;
 827
 828         ret = -ENOMEM;
 829         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 830                         sizeof(struct spufs_inode_info), 0,
 831                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 832
 833         if (!spufs_inode_cache)
 834                 goto out;
 835         ret = spu_sched_init();
 836         if (ret)
 837                 goto out_cache;
 838         ret = register_filesystem(&spufs_type);
 839         if (ret)
 840                 goto out_sched;
 841         ret = register_spu_syscalls(&spufs_calls);
 842         if (ret)
 843                 goto out_fs;
 844
 845         spufs_init_isolated_loader();
 846
 847         return 0;
 848
 849 out_fs:
 850         unregister_filesystem(&spufs_type);
 851 out_sched:
 852         spu_sched_exit();
 853 out_cache:
 854         kmem_cache_destroy(spufs_inode_cache);
 855 out:
 856         return ret;
 857 }
 858 module_init(spufs_init);
 859
 860 static void __exit spufs_exit(void)
 861 {
 862         spu_sched_exit();
 863         spufs_exit_isolated_loader();
 864         unregister_spu_syscalls(&spufs_calls);
 865         unregister_filesystem(&spufs_type);
 866         kmem_cache_destroy(spufs_inode_cache);
 867 }
 868 module_exit(spufs_exit);
 869
 870 MODULE_LICENSE("GPL");
 871 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 872