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_blocks = 0;
 101         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 102 out:
 103         return inode;
 104 }
 105
 106 static int
 107 spufs_setattr(struct dentry *dentry, struct iattr *attr)
 108 {
 109         struct inode *inode = dentry->d_inode;
 110
 111         if ((attr->ia_valid & ATTR_SIZE) &&
 112             (attr->ia_size != inode->i_size))
 113                 return -EINVAL;
 114         return inode_setattr(inode, attr);
 115 }
 116
 117
 118 static int
 119 spufs_new_file(struct super_block *sb, struct dentry *dentry,
 120                 const struct file_operations *fops, int mode,
 121                 size_t size, struct spu_context *ctx)
 122 {
 123         static struct inode_operations spufs_file_iops = {
 124                 .setattr = spufs_setattr,
 125         };
 126         struct inode *inode;
 127         int ret;
 128
 129         ret = -ENOSPC;
 130         inode = spufs_new_inode(sb, S_IFREG | mode);
 131         if (!inode)
 132                 goto out;
 133
 134         ret = 0;
 135         inode->i_op = &spufs_file_iops;
 136         inode->i_fop = fops;
 137         inode->i_size = size;
 138         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 139         d_add(dentry, inode);
 140 out:
 141         return ret;
 142 }
 143
 144 static void
 145 spufs_delete_inode(struct inode *inode)
 146 {
 147         struct spufs_inode_info *ei = SPUFS_I(inode);
 148
 149         if (ei->i_ctx)
 150                 put_spu_context(ei->i_ctx);
 151         if (ei->i_gang)
 152                 put_spu_gang(ei->i_gang);
 153         clear_inode(inode);
 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(&dcache_lock);
 163                 spin_lock(&dentry->d_lock);
 164                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
 165                         dget_locked(dentry);
 166                         __d_drop(dentry);
 167                         spin_unlock(&dentry->d_lock);
 168                         simple_unlink(dir->d_inode, dentry);
 169                         spin_unlock(&dcache_lock);
 170                         dput(dentry);
 171                 } else {
 172                         spin_unlock(&dentry->d_lock);
 173                         spin_unlock(&dcache_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, struct spufs_tree_descr *files,
 191                           int mode, struct spu_context *ctx)
 192 {
 193         struct dentry *dentry, *tmp;
 194         int ret;
 195
 196         while (files->name && files->name[0]) {
 197                 ret = -ENOMEM;
 198                 dentry = d_alloc_name(dir, files->name);
 199                 if (!dentry)
 200                         goto out;
 201                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 202                                         files->mode & mode, files->size, ctx);
 203                 if (ret)
 204                         goto out;
 205                 files++;
 206         }
 207         return 0;
 208 out:
 209         /*
 210          * remove all children from dir. dir->inode is not set so don't
 211          * just simply use spufs_prune_dir() and panic afterwards :)
 212          * dput() looks like it will do the right thing:
 213          * - dec parent's ref counter
 214          * - remove child from parent's child list
 215          * - free child's inode if possible
 216          * - free child
 217          */
 218         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 219                 dput(dentry);
 220         }
 221
 222         shrink_dcache_parent(dir);
 223         return ret;
 224 }
 225
 226 static int spufs_dir_close(struct inode *inode, struct file *file)
 227 {
 228         struct spu_context *ctx;
 229         struct inode *parent;
 230         struct dentry *dir;
 231         int ret;
 232
 233         dir = file->f_path.dentry;
 234         parent = dir->d_parent->d_inode;
 235         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 236
 237         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
 238         ret = spufs_rmdir(parent, dir);
 239         mutex_unlock(&parent->i_mutex);
 240         WARN_ON(ret);
 241
 242         /* We have to give up the mm_struct */
 243         spu_forget(ctx);
 244
 245         return dcache_dir_close(inode, file);
 246 }
 247
 248 const struct file_operations spufs_context_fops = {
 249         .open           = dcache_dir_open,
 250         .release        = spufs_dir_close,
 251         .llseek         = dcache_dir_lseek,
 252         .read           = generic_read_dir,
 253         .readdir        = dcache_readdir,
 254         .fsync          = simple_sync_file,
 255 };
 256 EXPORT_SYMBOL_GPL(spufs_context_fops);
 257
 258 static int
 259 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 260                 int mode)
 261 {
 262         int ret;
 263         struct inode *inode;
 264         struct spu_context *ctx;
 265
 266         ret = -ENOSPC;
 267         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 268         if (!inode)
 269                 goto out;
 270
 271         if (dir->i_mode & S_ISGID) {
 272                 inode->i_gid = dir->i_gid;
 273                 inode->i_mode &= S_ISGID;
 274         }
 275         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 276         SPUFS_I(inode)->i_ctx = ctx;
 277         if (!ctx)
 278                 goto out_iput;
 279
 280         ctx->flags = flags;
 281         inode->i_op = &simple_dir_inode_operations;
 282         inode->i_fop = &simple_dir_operations;
 283         if (flags & SPU_CREATE_NOSCHED)
 284                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 285                                          mode, ctx);
 286         else
 287                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 288
 289         if (ret)
 290                 goto out_free_ctx;
 291
 292         if (spufs_get_sb_info(dir->i_sb)->debug)
 293                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 294                                 mode, ctx);
 295
 296         if (ret)
 297                 goto out_free_ctx;
 298
 299         d_instantiate(dentry, inode);
 300         dget(dentry);
 301         inc_nlink(dir);
 302         inc_nlink(dentry->d_inode);
 303         goto out;
 304
 305 out_free_ctx:
 306         spu_forget(ctx);
 307         put_spu_context(ctx);
 308 out_iput:
 309         iput(inode);
 310 out:
 311         return ret;
 312 }
 313
 314 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 315 {
 316         int ret;
 317         struct file *filp;
 318
 319         ret = get_unused_fd();
 320         if (ret < 0) {
 321                 dput(dentry);
 322                 mntput(mnt);
 323                 goto out;
 324         }
 325
 326         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 327         if (IS_ERR(filp)) {
 328                 put_unused_fd(ret);
 329                 ret = PTR_ERR(filp);
 330                 goto out;
 331         }
 332
 333         filp->f_op = &spufs_context_fops;
 334         fd_install(ret, filp);
 335 out:
 336         return ret;
 337 }
 338
 339 static struct spu_context *
 340 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 341                                                 struct file *filp)
 342 {
 343         struct spu_context *tmp, *neighbor, *err;
 344         int count, node;
 345         int aff_supp;
 346
 347         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 348                                         struct spu, cbe_list))->aff_list);
 349
 350         if (!aff_supp)
 351                 return ERR_PTR(-EINVAL);
 352
 353         if (flags & SPU_CREATE_GANG)
 354                 return ERR_PTR(-EINVAL);
 355
 356         if (flags & SPU_CREATE_AFFINITY_MEM &&
 357             gang->aff_ref_ctx &&
 358             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 359                 return ERR_PTR(-EEXIST);
 360
 361         if (gang->aff_flags & AFF_MERGED)
 362                 return ERR_PTR(-EBUSY);
 363
 364         neighbor = NULL;
 365         if (flags & SPU_CREATE_AFFINITY_SPU) {
 366                 if (!filp || filp->f_op != &spufs_context_fops)
 367                         return ERR_PTR(-EINVAL);
 368
 369                 neighbor = get_spu_context(
 370                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
 371
 372                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 373                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 374                     !list_entry(neighbor->aff_list.next, struct spu_context,
 375                     aff_list)->aff_head) {
 376                         err = ERR_PTR(-EEXIST);
 377                         goto out_put_neighbor;
 378                 }
 379
 380                 if (gang != neighbor->gang) {
 381                         err = ERR_PTR(-EINVAL);
 382                         goto out_put_neighbor;
 383                 }
 384
 385                 count = 1;
 386                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 387                         count++;
 388                 if (list_empty(&neighbor->aff_list))
 389                         count++;
 390
 391                 for (node = 0; node < MAX_NUMNODES; node++) {
 392                         if ((cbe_spu_info[node].n_spus - atomic_read(
 393                                 &cbe_spu_info[node].reserved_spus)) >= count)
 394                                 break;
 395                 }
 396
 397                 if (node == MAX_NUMNODES) {
 398                         err = ERR_PTR(-EEXIST);
 399                         goto out_put_neighbor;
 400                 }
 401         }
 402
 403         return neighbor;
 404
 405 out_put_neighbor:
 406         put_spu_context(neighbor);
 407         return err;
 408 }
 409
 410 static void
 411 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 412                                         struct spu_context *neighbor)
 413 {
 414         if (flags & SPU_CREATE_AFFINITY_MEM)
 415                 ctx->gang->aff_ref_ctx = ctx;
 416
 417         if (flags & SPU_CREATE_AFFINITY_SPU) {
 418                 if (list_empty(&neighbor->aff_list)) {
 419                         list_add_tail(&neighbor->aff_list,
 420                                 &ctx->gang->aff_list_head);
 421                         neighbor->aff_head = 1;
 422                 }
 423
 424                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 425                     || list_entry(neighbor->aff_list.next, struct spu_context,
 426                                                         aff_list)->aff_head) {
 427                         list_add(&ctx->aff_list, &neighbor->aff_list);
 428                 } else  {
 429                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 430                         if (neighbor->aff_head) {
 431                                 neighbor->aff_head = 0;
 432                                 ctx->aff_head = 1;
 433                         }
 434                 }
 435
 436                 if (!ctx->gang->aff_ref_ctx)
 437                         ctx->gang->aff_ref_ctx = ctx;
 438         }
 439 }
 440
 441 static int
 442 spufs_create_context(struct inode *inode, struct dentry *dentry,
 443                         struct vfsmount *mnt, int flags, int mode,
 444                         struct file *aff_filp)
 445 {
 446         int ret;
 447         int affinity;
 448         struct spu_gang *gang;
 449         struct spu_context *neighbor;
 450
 451         ret = -EPERM;
 452         if ((flags & SPU_CREATE_NOSCHED) &&
 453             !capable(CAP_SYS_NICE))
 454                 goto out_unlock;
 455
 456         ret = -EINVAL;
 457         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 458             == SPU_CREATE_ISOLATE)
 459                 goto out_unlock;
 460
 461         ret = -ENODEV;
 462         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 463                 goto out_unlock;
 464
 465         gang = NULL;
 466         neighbor = NULL;
 467         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 468         if (affinity) {
 469                 gang = SPUFS_I(inode)->i_gang;
 470                 ret = -EINVAL;
 471                 if (!gang)
 472                         goto out_unlock;
 473                 mutex_lock(&gang->aff_mutex);
 474                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 475                 if (IS_ERR(neighbor)) {
 476                         ret = PTR_ERR(neighbor);
 477                         goto out_aff_unlock;
 478                 }
 479         }
 480
 481         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 482         if (ret)
 483                 goto out_aff_unlock;
 484
 485         if (affinity) {
 486                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 487                                                                 neighbor);
 488                 if (neighbor)
 489                         put_spu_context(neighbor);
 490         }
 491
 492         /*
 493          * get references for dget and mntget, will be released
 494          * in error path of *_open().
 495          */
 496         ret = spufs_context_open(dget(dentry), mntget(mnt));
 497         if (ret < 0) {
 498                 WARN_ON(spufs_rmdir(inode, dentry));
 499                 if (affinity)
 500                         mutex_unlock(&gang->aff_mutex);
 501                 mutex_unlock(&inode->i_mutex);
 502                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 503                 goto out;
 504         }
 505
 506 out_aff_unlock:
 507         if (affinity)
 508                 mutex_unlock(&gang->aff_mutex);
 509 out_unlock:
 510         mutex_unlock(&inode->i_mutex);
 511 out:
 512         dput(dentry);
 513         return ret;
 514 }
 515
 516 static int
 517 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
 518 {
 519         int ret;
 520         struct inode *inode;
 521         struct spu_gang *gang;
 522
 523         ret = -ENOSPC;
 524         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 525         if (!inode)
 526                 goto out;
 527
 528         ret = 0;
 529         if (dir->i_mode & S_ISGID) {
 530                 inode->i_gid = dir->i_gid;
 531                 inode->i_mode &= S_ISGID;
 532         }
 533         gang = alloc_spu_gang();
 534         SPUFS_I(inode)->i_ctx = NULL;
 535         SPUFS_I(inode)->i_gang = gang;
 536         if (!gang)
 537                 goto out_iput;
 538
 539         inode->i_op = &simple_dir_inode_operations;
 540         inode->i_fop = &simple_dir_operations;
 541
 542         d_instantiate(dentry, inode);
 543         inc_nlink(dir);
 544         inc_nlink(dentry->d_inode);
 545         return ret;
 546
 547 out_iput:
 548         iput(inode);
 549 out:
 550         return ret;
 551 }
 552
 553 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 554 {
 555         int ret;
 556         struct file *filp;
 557
 558         ret = get_unused_fd();
 559         if (ret < 0) {
 560                 dput(dentry);
 561                 mntput(mnt);
 562                 goto out;
 563         }
 564
 565         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 566         if (IS_ERR(filp)) {
 567                 put_unused_fd(ret);
 568                 ret = PTR_ERR(filp);
 569                 goto out;
 570         }
 571
 572         filp->f_op = &simple_dir_operations;
 573         fd_install(ret, filp);
 574 out:
 575         return ret;
 576 }
 577
 578 static int spufs_create_gang(struct inode *inode,
 579                         struct dentry *dentry,
 580                         struct vfsmount *mnt, int mode)
 581 {
 582         int ret;
 583
 584         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 585         if (ret)
 586                 goto out;
 587
 588         /*
 589          * get references for dget and mntget, will be released
 590          * in error path of *_open().
 591          */
 592         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 593         if (ret < 0) {
 594                 int err = simple_rmdir(inode, dentry);
 595                 WARN_ON(err);
 596         }
 597
 598 out:
 599         mutex_unlock(&inode->i_mutex);
 600         dput(dentry);
 601         return ret;
 602 }
 603
 604
 605 static struct file_system_type spufs_type;
 606
 607 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
 608                                                         struct file *filp)
 609 {
 610         struct dentry *dentry;
 611         int ret;
 612
 613         ret = -EINVAL;
 614         /* check if we are on spufs */
 615         if (nd->path.dentry->d_sb->s_type != &spufs_type)
 616                 goto out;
 617
 618         /* don't accept undefined flags */
 619         if (flags & (~SPU_CREATE_FLAG_ALL))
 620                 goto out;
 621
 622         /* only threads can be underneath a gang */
 623         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
 624                 if ((flags & SPU_CREATE_GANG) ||
 625                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
 626                         goto out;
 627         }
 628
 629         dentry = lookup_create(nd, 1);
 630         ret = PTR_ERR(dentry);
 631         if (IS_ERR(dentry))
 632                 goto out_dir;
 633
 634         ret = -EEXIST;
 635         if (dentry->d_inode)
 636                 goto out_dput;
 637
 638         mode &= ~current->fs->umask;
 639
 640         if (flags & SPU_CREATE_GANG)
 641                 ret = spufs_create_gang(nd->path.dentry->d_inode,
 642                                          dentry, nd->path.mnt, mode);
 643         else
 644                 ret = spufs_create_context(nd->path.dentry->d_inode,
 645                                             dentry, nd->path.mnt, flags, mode,
 646                                             filp);
 647         if (ret >= 0)
 648                 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
 649         return ret;
 650
 651 out_dput:
 652         dput(dentry);
 653 out_dir:
 654         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
 655 out:
 656         return ret;
 657 }
 658
 659 /* File system initialization */
 660 enum {
 661         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 662 };
 663
 664 static const match_table_t spufs_tokens = {
 665         { Opt_uid,   "uid=%d" },
 666         { Opt_gid,   "gid=%d" },
 667         { Opt_mode,  "mode=%o" },
 668         { Opt_debug, "debug" },
 669         { Opt_err,    NULL  },
 670 };
 671
 672 static int
 673 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 674 {
 675         char *p;
 676         substring_t args[MAX_OPT_ARGS];
 677
 678         while ((p = strsep(&options, ",")) != NULL) {
 679                 int token, option;
 680
 681                 if (!*p)
 682                         continue;
 683
 684                 token = match_token(p, spufs_tokens, args);
 685                 switch (token) {
 686                 case Opt_uid:
 687                         if (match_int(&args[0], &option))
 688                                 return 0;
 689                         root->i_uid = option;
 690                         break;
 691                 case Opt_gid:
 692                         if (match_int(&args[0], &option))
 693                                 return 0;
 694                         root->i_gid = option;
 695                         break;
 696                 case Opt_mode:
 697                         if (match_octal(&args[0], &option))
 698                                 return 0;
 699                         root->i_mode = option | S_IFDIR;
 700                         break;
 701                 case Opt_debug:
 702                         spufs_get_sb_info(sb)->debug = 1;
 703                         break;
 704                 default:
 705                         return 0;
 706                 }
 707         }
 708         return 1;
 709 }
 710
 711 static void spufs_exit_isolated_loader(void)
 712 {
 713         free_pages((unsigned long) isolated_loader,
 714                         get_order(isolated_loader_size));
 715 }
 716
 717 static void
 718 spufs_init_isolated_loader(void)
 719 {
 720         struct device_node *dn;
 721         const char *loader;
 722         int size;
 723
 724         dn = of_find_node_by_path("/spu-isolation");
 725         if (!dn)
 726                 return;
 727
 728         loader = of_get_property(dn, "loader", &size);
 729         if (!loader)
 730                 return;
 731
 732         /* the loader must be align on a 16 byte boundary */
 733         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 734         if (!isolated_loader)
 735                 return;
 736
 737         isolated_loader_size = size;
 738         memcpy(isolated_loader, loader, size);
 739         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 740 }
 741
 742 static int
 743 spufs_create_root(struct super_block *sb, void *data)
 744 {
 745         struct inode *inode;
 746         int ret;
 747
 748         ret = -ENODEV;
 749         if (!spu_management_ops)
 750                 goto out;
 751
 752         ret = -ENOMEM;
 753         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 754         if (!inode)
 755                 goto out;
 756
 757         inode->i_op = &simple_dir_inode_operations;
 758         inode->i_fop = &simple_dir_operations;
 759         SPUFS_I(inode)->i_ctx = NULL;
 760         inc_nlink(inode);
 761
 762         ret = -EINVAL;
 763         if (!spufs_parse_options(sb, data, inode))
 764                 goto out_iput;
 765
 766         ret = -ENOMEM;
 767         sb->s_root = d_alloc_root(inode);
 768         if (!sb->s_root)
 769                 goto out_iput;
 770
 771         return 0;
 772 out_iput:
 773         iput(inode);
 774 out:
 775         return ret;
 776 }
 777
 778 static int
 779 spufs_fill_super(struct super_block *sb, void *data, int silent)
 780 {
 781         struct spufs_sb_info *info;
 782         static struct super_operations s_ops = {
 783                 .alloc_inode = spufs_alloc_inode,
 784                 .destroy_inode = spufs_destroy_inode,
 785                 .statfs = simple_statfs,
 786                 .delete_inode = spufs_delete_inode,
 787                 .drop_inode = generic_delete_inode,
 788                 .show_options = generic_show_options,
 789         };
 790
 791         save_mount_options(sb, data);
 792
 793         info = kzalloc(sizeof(*info), GFP_KERNEL);
 794         if (!info)
 795                 return -ENOMEM;
 796
 797         sb->s_maxbytes = MAX_LFS_FILESIZE;
 798         sb->s_blocksize = PAGE_CACHE_SIZE;
 799         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 800         sb->s_magic = SPUFS_MAGIC;
 801         sb->s_op = &s_ops;
 802         sb->s_fs_info = info;
 803
 804         return spufs_create_root(sb, data);
 805 }
 806
 807 static int
 808 spufs_get_sb(struct file_system_type *fstype, int flags,
 809                 const char *name, void *data, struct vfsmount *mnt)
 810 {
 811         return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
 812 }
 813
 814 static struct file_system_type spufs_type = {
 815         .owner = THIS_MODULE,
 816         .name = "spufs",
 817         .get_sb = spufs_get_sb,
 818         .kill_sb = kill_litter_super,
 819 };
 820
 821 static int __init spufs_init(void)
 822 {
 823         int ret;
 824
 825         ret = -ENODEV;
 826         if (!spu_management_ops)
 827                 goto out;
 828
 829         ret = -ENOMEM;
 830         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 831                         sizeof(struct spufs_inode_info), 0,
 832                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 833
 834         if (!spufs_inode_cache)
 835                 goto out;
 836         ret = spu_sched_init();
 837         if (ret)
 838                 goto out_cache;
 839         ret = register_filesystem(&spufs_type);
 840         if (ret)
 841                 goto out_sched;
 842         ret = register_spu_syscalls(&spufs_calls);
 843         if (ret)
 844                 goto out_fs;
 845
 846         spufs_init_isolated_loader();
 847
 848         return 0;
 849
 850 out_fs:
 851         unregister_filesystem(&spufs_type);
 852 out_sched:
 853         spu_sched_exit();
 854 out_cache:
 855         kmem_cache_destroy(spufs_inode_cache);
 856 out:
 857         return ret;
 858 }
 859 module_init(spufs_init);
 860
 861 static void __exit spufs_exit(void)
 862 {
 863         spu_sched_exit();
 864         spufs_exit_isolated_loader();
 865         unregister_spu_syscalls(&spufs_calls);
 866         unregister_filesystem(&spufs_type);
 867         kmem_cache_destroy(spufs_inode_cache);
 868 }
 869 module_exit(spufs_exit);
 870
 871 MODULE_LICENSE("GPL");
 872 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 873