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(&dcache_lock);
 163                 spin_lock(&dentry->d_lock);
 164                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
 165                         dget_locked_dlock(dentry);
 166                         __d_drop(dentry);
 167                         spin_unlock(&dentry->d_lock);
 168                         simple_unlink(dir->d_inode, dentry);
 169                         /* XXX: what is dcache_lock protecting here? Other
 170                          * filesystems (IB, configfs) release dcache_lock
 171                          * before unlink */
 172                         spin_unlock(&dcache_lock);
 173                         dput(dentry);
 174                 } else {
 175                         spin_unlock(&dentry->d_lock);
 176                         spin_unlock(&dcache_lock);
 177                 }
 178         }
 179         shrink_dcache_parent(dir);
 180         mutex_unlock(&dir->d_inode->i_mutex);
 181 }
 182
 183 /* Caller must hold parent->i_mutex */
 184 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 185 {
 186         /* remove all entries */
 187         spufs_prune_dir(dir);
 188         d_drop(dir);
 189
 190         return simple_rmdir(parent, dir);
 191 }
 192
 193 static int spufs_fill_dir(struct dentry *dir,
 194                 const struct spufs_tree_descr *files, int mode,
 195                 struct spu_context *ctx)
 196 {
 197         struct dentry *dentry, *tmp;
 198         int ret;
 199
 200         while (files->name && files->name[0]) {
 201                 ret = -ENOMEM;
 202                 dentry = d_alloc_name(dir, files->name);
 203                 if (!dentry)
 204                         goto out;
 205                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 206                                         files->mode & mode, files->size, ctx);
 207                 if (ret)
 208                         goto out;
 209                 files++;
 210         }
 211         return 0;
 212 out:
 213         /*
 214          * remove all children from dir. dir->inode is not set so don't
 215          * just simply use spufs_prune_dir() and panic afterwards :)
 216          * dput() looks like it will do the right thing:
 217          * - dec parent's ref counter
 218          * - remove child from parent's child list
 219          * - free child's inode if possible
 220          * - free child
 221          */
 222         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 223                 dput(dentry);
 224         }
 225
 226         shrink_dcache_parent(dir);
 227         return ret;
 228 }
 229
 230 static int spufs_dir_close(struct inode *inode, struct file *file)
 231 {
 232         struct spu_context *ctx;
 233         struct inode *parent;
 234         struct dentry *dir;
 235         int ret;
 236
 237         dir = file->f_path.dentry;
 238         parent = dir->d_parent->d_inode;
 239         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 240
 241         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
 242         ret = spufs_rmdir(parent, dir);
 243         mutex_unlock(&parent->i_mutex);
 244         WARN_ON(ret);
 245
 246         /* We have to give up the mm_struct */
 247         spu_forget(ctx);
 248
 249         return dcache_dir_close(inode, file);
 250 }
 251
 252 const struct file_operations spufs_context_fops = {
 253         .open           = dcache_dir_open,
 254         .release        = spufs_dir_close,
 255         .llseek         = dcache_dir_lseek,
 256         .read           = generic_read_dir,
 257         .readdir        = dcache_readdir,
 258         .fsync          = noop_fsync,
 259 };
 260 EXPORT_SYMBOL_GPL(spufs_context_fops);
 261
 262 static int
 263 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 264                 int mode)
 265 {
 266         int ret;
 267         struct inode *inode;
 268         struct spu_context *ctx;
 269
 270         ret = -ENOSPC;
 271         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 272         if (!inode)
 273                 goto out;
 274
 275         if (dir->i_mode & S_ISGID) {
 276                 inode->i_gid = dir->i_gid;
 277                 inode->i_mode &= S_ISGID;
 278         }
 279         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 280         SPUFS_I(inode)->i_ctx = ctx;
 281         if (!ctx)
 282                 goto out_iput;
 283
 284         ctx->flags = flags;
 285         inode->i_op = &simple_dir_inode_operations;
 286         inode->i_fop = &simple_dir_operations;
 287         if (flags & SPU_CREATE_NOSCHED)
 288                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 289                                          mode, ctx);
 290         else
 291                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 292
 293         if (ret)
 294                 goto out_free_ctx;
 295
 296         if (spufs_get_sb_info(dir->i_sb)->debug)
 297                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 298                                 mode, ctx);
 299
 300         if (ret)
 301                 goto out_free_ctx;
 302
 303         d_instantiate(dentry, inode);
 304         dget(dentry);
 305         inc_nlink(dir);
 306         inc_nlink(dentry->d_inode);
 307         goto out;
 308
 309 out_free_ctx:
 310         spu_forget(ctx);
 311         put_spu_context(ctx);
 312 out_iput:
 313         iput(inode);
 314 out:
 315         return ret;
 316 }
 317
 318 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 319 {
 320         int ret;
 321         struct file *filp;
 322
 323         ret = get_unused_fd();
 324         if (ret < 0) {
 325                 dput(dentry);
 326                 mntput(mnt);
 327                 goto out;
 328         }
 329
 330         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 331         if (IS_ERR(filp)) {
 332                 put_unused_fd(ret);
 333                 ret = PTR_ERR(filp);
 334                 goto out;
 335         }
 336
 337         filp->f_op = &spufs_context_fops;
 338         fd_install(ret, filp);
 339 out:
 340         return ret;
 341 }
 342
 343 static struct spu_context *
 344 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 345                                                 struct file *filp)
 346 {
 347         struct spu_context *tmp, *neighbor, *err;
 348         int count, node;
 349         int aff_supp;
 350
 351         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 352                                         struct spu, cbe_list))->aff_list);
 353
 354         if (!aff_supp)
 355                 return ERR_PTR(-EINVAL);
 356
 357         if (flags & SPU_CREATE_GANG)
 358                 return ERR_PTR(-EINVAL);
 359
 360         if (flags & SPU_CREATE_AFFINITY_MEM &&
 361             gang->aff_ref_ctx &&
 362             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 363                 return ERR_PTR(-EEXIST);
 364
 365         if (gang->aff_flags & AFF_MERGED)
 366                 return ERR_PTR(-EBUSY);
 367
 368         neighbor = NULL;
 369         if (flags & SPU_CREATE_AFFINITY_SPU) {
 370                 if (!filp || filp->f_op != &spufs_context_fops)
 371                         return ERR_PTR(-EINVAL);
 372
 373                 neighbor = get_spu_context(
 374                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
 375
 376                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 377                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 378                     !list_entry(neighbor->aff_list.next, struct spu_context,
 379                     aff_list)->aff_head) {
 380                         err = ERR_PTR(-EEXIST);
 381                         goto out_put_neighbor;
 382                 }
 383
 384                 if (gang != neighbor->gang) {
 385                         err = ERR_PTR(-EINVAL);
 386                         goto out_put_neighbor;
 387                 }
 388
 389                 count = 1;
 390                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 391                         count++;
 392                 if (list_empty(&neighbor->aff_list))
 393                         count++;
 394
 395                 for (node = 0; node < MAX_NUMNODES; node++) {
 396                         if ((cbe_spu_info[node].n_spus - atomic_read(
 397                                 &cbe_spu_info[node].reserved_spus)) >= count)
 398                                 break;
 399                 }
 400
 401                 if (node == MAX_NUMNODES) {
 402                         err = ERR_PTR(-EEXIST);
 403                         goto out_put_neighbor;
 404                 }
 405         }
 406
 407         return neighbor;
 408
 409 out_put_neighbor:
 410         put_spu_context(neighbor);
 411         return err;
 412 }
 413
 414 static void
 415 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 416                                         struct spu_context *neighbor)
 417 {
 418         if (flags & SPU_CREATE_AFFINITY_MEM)
 419                 ctx->gang->aff_ref_ctx = ctx;
 420
 421         if (flags & SPU_CREATE_AFFINITY_SPU) {
 422                 if (list_empty(&neighbor->aff_list)) {
 423                         list_add_tail(&neighbor->aff_list,
 424                                 &ctx->gang->aff_list_head);
 425                         neighbor->aff_head = 1;
 426                 }
 427
 428                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 429                     || list_entry(neighbor->aff_list.next, struct spu_context,
 430                                                         aff_list)->aff_head) {
 431                         list_add(&ctx->aff_list, &neighbor->aff_list);
 432                 } else  {
 433                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 434                         if (neighbor->aff_head) {
 435                                 neighbor->aff_head = 0;
 436                                 ctx->aff_head = 1;
 437                         }
 438                 }
 439
 440                 if (!ctx->gang->aff_ref_ctx)
 441                         ctx->gang->aff_ref_ctx = ctx;
 442         }
 443 }
 444
 445 static int
 446 spufs_create_context(struct inode *inode, struct dentry *dentry,
 447                         struct vfsmount *mnt, int flags, int mode,
 448                         struct file *aff_filp)
 449 {
 450         int ret;
 451         int affinity;
 452         struct spu_gang *gang;
 453         struct spu_context *neighbor;
 454
 455         ret = -EPERM;
 456         if ((flags & SPU_CREATE_NOSCHED) &&
 457             !capable(CAP_SYS_NICE))
 458                 goto out_unlock;
 459
 460         ret = -EINVAL;
 461         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 462             == SPU_CREATE_ISOLATE)
 463                 goto out_unlock;
 464
 465         ret = -ENODEV;
 466         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 467                 goto out_unlock;
 468
 469         gang = NULL;
 470         neighbor = NULL;
 471         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 472         if (affinity) {
 473                 gang = SPUFS_I(inode)->i_gang;
 474                 ret = -EINVAL;
 475                 if (!gang)
 476                         goto out_unlock;
 477                 mutex_lock(&gang->aff_mutex);
 478                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 479                 if (IS_ERR(neighbor)) {
 480                         ret = PTR_ERR(neighbor);
 481                         goto out_aff_unlock;
 482                 }
 483         }
 484
 485         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 486         if (ret)
 487                 goto out_aff_unlock;
 488
 489         if (affinity) {
 490                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 491                                                                 neighbor);
 492                 if (neighbor)
 493                         put_spu_context(neighbor);
 494         }
 495
 496         /*
 497          * get references for dget and mntget, will be released
 498          * in error path of *_open().
 499          */
 500         ret = spufs_context_open(dget(dentry), mntget(mnt));
 501         if (ret < 0) {
 502                 WARN_ON(spufs_rmdir(inode, dentry));
 503                 if (affinity)
 504                         mutex_unlock(&gang->aff_mutex);
 505                 mutex_unlock(&inode->i_mutex);
 506                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 507                 goto out;
 508         }
 509
 510 out_aff_unlock:
 511         if (affinity)
 512                 mutex_unlock(&gang->aff_mutex);
 513 out_unlock:
 514         mutex_unlock(&inode->i_mutex);
 515 out:
 516         dput(dentry);
 517         return ret;
 518 }
 519
 520 static int
 521 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
 522 {
 523         int ret;
 524         struct inode *inode;
 525         struct spu_gang *gang;
 526
 527         ret = -ENOSPC;
 528         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 529         if (!inode)
 530                 goto out;
 531
 532         ret = 0;
 533         if (dir->i_mode & S_ISGID) {
 534                 inode->i_gid = dir->i_gid;
 535                 inode->i_mode &= S_ISGID;
 536         }
 537         gang = alloc_spu_gang();
 538         SPUFS_I(inode)->i_ctx = NULL;
 539         SPUFS_I(inode)->i_gang = gang;
 540         if (!gang)
 541                 goto out_iput;
 542
 543         inode->i_op = &simple_dir_inode_operations;
 544         inode->i_fop = &simple_dir_operations;
 545
 546         d_instantiate(dentry, inode);
 547         inc_nlink(dir);
 548         inc_nlink(dentry->d_inode);
 549         return ret;
 550
 551 out_iput:
 552         iput(inode);
 553 out:
 554         return ret;
 555 }
 556
 557 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 558 {
 559         int ret;
 560         struct file *filp;
 561
 562         ret = get_unused_fd();
 563         if (ret < 0) {
 564                 dput(dentry);
 565                 mntput(mnt);
 566                 goto out;
 567         }
 568
 569         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 570         if (IS_ERR(filp)) {
 571                 put_unused_fd(ret);
 572                 ret = PTR_ERR(filp);
 573                 goto out;
 574         }
 575
 576         filp->f_op = &simple_dir_operations;
 577         fd_install(ret, filp);
 578 out:
 579         return ret;
 580 }
 581
 582 static int spufs_create_gang(struct inode *inode,
 583                         struct dentry *dentry,
 584                         struct vfsmount *mnt, int mode)
 585 {
 586         int ret;
 587
 588         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 589         if (ret)
 590                 goto out;
 591
 592         /*
 593          * get references for dget and mntget, will be released
 594          * in error path of *_open().
 595          */
 596         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 597         if (ret < 0) {
 598                 int err = simple_rmdir(inode, dentry);
 599                 WARN_ON(err);
 600         }
 601
 602 out:
 603         mutex_unlock(&inode->i_mutex);
 604         dput(dentry);
 605         return ret;
 606 }
 607
 608
 609 static struct file_system_type spufs_type;
 610
 611 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
 612                                                         struct file *filp)
 613 {
 614         struct dentry *dentry;
 615         int ret;
 616
 617         ret = -EINVAL;
 618         /* check if we are on spufs */
 619         if (nd->path.dentry->d_sb->s_type != &spufs_type)
 620                 goto out;
 621
 622         /* don't accept undefined flags */
 623         if (flags & (~SPU_CREATE_FLAG_ALL))
 624                 goto out;
 625
 626         /* only threads can be underneath a gang */
 627         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
 628                 if ((flags & SPU_CREATE_GANG) ||
 629                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
 630                         goto out;
 631         }
 632
 633         dentry = lookup_create(nd, 1);
 634         ret = PTR_ERR(dentry);
 635         if (IS_ERR(dentry))
 636                 goto out_dir;
 637
 638         mode &= ~current_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_dir:
 652         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
 653 out:
 654         return ret;
 655 }
 656
 657 /* File system initialization */
 658 enum {
 659         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 660 };
 661
 662 static const match_table_t spufs_tokens = {
 663         { Opt_uid,   "uid=%d" },
 664         { Opt_gid,   "gid=%d" },
 665         { Opt_mode,  "mode=%o" },
 666         { Opt_debug, "debug" },
 667         { Opt_err,    NULL  },
 668 };
 669
 670 static int
 671 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 672 {
 673         char *p;
 674         substring_t args[MAX_OPT_ARGS];
 675
 676         while ((p = strsep(&options, ",")) != NULL) {
 677                 int token, option;
 678
 679                 if (!*p)
 680                         continue;
 681
 682                 token = match_token(p, spufs_tokens, args);
 683                 switch (token) {
 684                 case Opt_uid:
 685                         if (match_int(&args[0], &option))
 686                                 return 0;
 687                         root->i_uid = option;
 688                         break;
 689                 case Opt_gid:
 690                         if (match_int(&args[0], &option))
 691                                 return 0;
 692                         root->i_gid = option;
 693                         break;
 694                 case Opt_mode:
 695                         if (match_octal(&args[0], &option))
 696                                 return 0;
 697                         root->i_mode = option | S_IFDIR;
 698                         break;
 699                 case Opt_debug:
 700                         spufs_get_sb_info(sb)->debug = 1;
 701                         break;
 702                 default:
 703                         return 0;
 704                 }
 705         }
 706         return 1;
 707 }
 708
 709 static void spufs_exit_isolated_loader(void)
 710 {
 711         free_pages((unsigned long) isolated_loader,
 712                         get_order(isolated_loader_size));
 713 }
 714
 715 static void
 716 spufs_init_isolated_loader(void)
 717 {
 718         struct device_node *dn;
 719         const char *loader;
 720         int size;
 721
 722         dn = of_find_node_by_path("/spu-isolation");
 723         if (!dn)
 724                 return;
 725
 726         loader = of_get_property(dn, "loader", &size);
 727         if (!loader)
 728                 return;
 729
 730         /* the loader must be align on a 16 byte boundary */
 731         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 732         if (!isolated_loader)
 733                 return;
 734
 735         isolated_loader_size = size;
 736         memcpy(isolated_loader, loader, size);
 737         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 738 }
 739
 740 static int
 741 spufs_create_root(struct super_block *sb, void *data)
 742 {
 743         struct inode *inode;
 744         int ret;
 745
 746         ret = -ENODEV;
 747         if (!spu_management_ops)
 748                 goto out;
 749
 750         ret = -ENOMEM;
 751         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 752         if (!inode)
 753                 goto out;
 754
 755         inode->i_op = &simple_dir_inode_operations;
 756         inode->i_fop = &simple_dir_operations;
 757         SPUFS_I(inode)->i_ctx = NULL;
 758         inc_nlink(inode);
 759
 760         ret = -EINVAL;
 761         if (!spufs_parse_options(sb, data, inode))
 762                 goto out_iput;
 763
 764         ret = -ENOMEM;
 765         sb->s_root = d_alloc_root(inode);
 766         if (!sb->s_root)
 767                 goto out_iput;
 768
 769         return 0;
 770 out_iput:
 771         iput(inode);
 772 out:
 773         return ret;
 774 }
 775
 776 static int
 777 spufs_fill_super(struct super_block *sb, void *data, int silent)
 778 {
 779         struct spufs_sb_info *info;
 780         static const struct super_operations s_ops = {
 781                 .alloc_inode = spufs_alloc_inode,
 782                 .destroy_inode = spufs_destroy_inode,
 783                 .statfs = simple_statfs,
 784                 .evict_inode = spufs_evict_inode,
 785                 .show_options = generic_show_options,
 786         };
 787
 788         save_mount_options(sb, data);
 789
 790         info = kzalloc(sizeof(*info), GFP_KERNEL);
 791         if (!info)
 792                 return -ENOMEM;
 793
 794         sb->s_maxbytes = MAX_LFS_FILESIZE;
 795         sb->s_blocksize = PAGE_CACHE_SIZE;
 796         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 797         sb->s_magic = SPUFS_MAGIC;
 798         sb->s_op = &s_ops;
 799         sb->s_fs_info = info;
 800
 801         return spufs_create_root(sb, data);
 802 }
 803
 804 static struct dentry *
 805 spufs_mount(struct file_system_type *fstype, int flags,
 806                 const char *name, void *data)
 807 {
 808         return mount_single(fstype, flags, data, spufs_fill_super);
 809 }
 810
 811 static struct file_system_type spufs_type = {
 812         .owner = THIS_MODULE,
 813         .name = "spufs",
 814         .mount = spufs_mount,
 815         .kill_sb = kill_litter_super,
 816 };
 817
 818 static int __init spufs_init(void)
 819 {
 820         int ret;
 821
 822         ret = -ENODEV;
 823         if (!spu_management_ops)
 824                 goto out;
 825
 826         ret = -ENOMEM;
 827         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 828                         sizeof(struct spufs_inode_info), 0,
 829                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 830
 831         if (!spufs_inode_cache)
 832                 goto out;
 833         ret = spu_sched_init();
 834         if (ret)
 835                 goto out_cache;
 836         ret = register_filesystem(&spufs_type);
 837         if (ret)
 838                 goto out_sched;
 839         ret = register_spu_syscalls(&spufs_calls);
 840         if (ret)
 841                 goto out_fs;
 842
 843         spufs_init_isolated_loader();
 844
 845         return 0;
 846
 847 out_fs:
 848         unregister_filesystem(&spufs_type);
 849 out_sched:
 850         spu_sched_exit();
 851 out_cache:
 852         kmem_cache_destroy(spufs_inode_cache);
 853 out:
 854         return ret;
 855 }
 856 module_init(spufs_init);
 857
 858 static void __exit spufs_exit(void)
 859 {
 860         spu_sched_exit();
 861         spufs_exit_isolated_loader();
 862         unregister_spu_syscalls(&spufs_calls);
 863         unregister_filesystem(&spufs_type);
 864         kmem_cache_destroy(spufs_inode_cache);
 865 }
 866 module_exit(spufs_exit);
 867
 868 MODULE_LICENSE("GPL");
 869 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 870