arch/powerpc/platforms/cell/spufs/inode.c

   1
   2 /*
   3  * SPU file system
   4  *
   5  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
   6  *
   7  * Author: Arnd Bergmann <arndb@de.ibm.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/file.h>
  25 #include <linux/fs.h>
  26 #include <linux/fsnotify.h>
  27 #include <linux/backing-dev.h>
  28 #include <linux/init.h>
  29 #include <linux/ioctl.h>
  30 #include <linux/module.h>
  31 #include <linux/mount.h>
  32 #include <linux/namei.h>
  33 #include <linux/pagemap.h>
  34 #include <linux/poll.h>
  35 #include <linux/slab.h>
  36 #include <linux/parser.h>
  37
  38 #include <asm/prom.h>
  39 #include <asm/spu.h>
  40 #include <asm/spu_priv1.h>
  41 #include <asm/uaccess.h>
  42
  43 #include "spufs.h"
  44
  45 struct spufs_sb_info {
  46         int debug;
  47 };
  48
  49 static struct kmem_cache *spufs_inode_cache;
  50 char *isolated_loader;
  51 static int isolated_loader_size;
  52
  53 static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
  54 {
  55         return sb->s_fs_info;
  56 }
  57
  58 static struct inode *
  59 spufs_alloc_inode(struct super_block *sb)
  60 {
  61         struct spufs_inode_info *ei;
  62
  63         ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
  64         if (!ei)
  65                 return NULL;
  66
  67         ei->i_gang = NULL;
  68         ei->i_ctx = NULL;
  69         ei->i_openers = 0;
  70
  71         return &ei->vfs_inode;
  72 }
  73
  74 static void spufs_i_callback(struct rcu_head *head)
  75 {
  76         struct inode *inode = container_of(head, struct inode, i_rcu);
  77         INIT_LIST_HEAD(&inode->i_dentry);
  78         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
  79 }
  80
  81 static void spufs_destroy_inode(struct inode *inode)
  82 {
  83         call_rcu(&inode->i_rcu, spufs_i_callback);
  84 }
  85
  86 static void
  87 spufs_init_once(void *p)
  88 {
  89         struct spufs_inode_info *ei = p;
  90
  91         inode_init_once(&ei->vfs_inode);
  92 }
  93
  94 static struct inode *
  95 spufs_new_inode(struct super_block *sb, int mode)
  96 {
  97         struct inode *inode;
  98
  99         inode = new_inode(sb);
 100         if (!inode)
 101                 goto out;
 102
 103         inode->i_mode = mode;
 104         inode->i_uid = current_fsuid();
 105         inode->i_gid = current_fsgid();
 106         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 107 out:
 108         return inode;
 109 }
 110
 111 static int
 112 spufs_setattr(struct dentry *dentry, struct iattr *attr)
 113 {
 114         struct inode *inode = dentry->d_inode;
 115
 116         if ((attr->ia_valid & ATTR_SIZE) &&
 117             (attr->ia_size != inode->i_size))
 118                 return -EINVAL;
 119         setattr_copy(inode, attr);
 120         mark_inode_dirty(inode);
 121         return 0;
 122 }
 123
 124
 125 static int
 126 spufs_new_file(struct super_block *sb, struct dentry *dentry,
 127                 const struct file_operations *fops, int mode,
 128                 size_t size, struct spu_context *ctx)
 129 {
 130         static const struct inode_operations spufs_file_iops = {
 131                 .setattr = spufs_setattr,
 132         };
 133         struct inode *inode;
 134         int ret;
 135
 136         ret = -ENOSPC;
 137         inode = spufs_new_inode(sb, S_IFREG | mode);
 138         if (!inode)
 139                 goto out;
 140
 141         ret = 0;
 142         inode->i_op = &spufs_file_iops;
 143         inode->i_fop = fops;
 144         inode->i_size = size;
 145         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 146         d_add(dentry, inode);
 147 out:
 148         return ret;
 149 }
 150
 151 static void
 152 spufs_evict_inode(struct inode *inode)
 153 {
 154         struct spufs_inode_info *ei = SPUFS_I(inode);
 155         end_writeback(inode);
 156         if (ei->i_ctx)
 157                 put_spu_context(ei->i_ctx);
 158         if (ei->i_gang)
 159                 put_spu_gang(ei->i_gang);
 160 }
 161
 162 static void spufs_prune_dir(struct dentry *dir)
 163 {
 164         struct dentry *dentry, *tmp;
 165
 166         mutex_lock(&dir->d_inode->i_mutex);
 167         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 168                 spin_lock(&dentry->d_lock);
 169                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
 170                         dget_dlock(dentry);
 171                         __d_drop(dentry);
 172                         spin_unlock(&dentry->d_lock);
 173                         simple_unlink(dir->d_inode, dentry);
 174                         /* XXX: what was dcache_lock protecting here? Other
 175                          * filesystems (IB, configfs) release dcache_lock
 176                          * before unlink */
 177                         dput(dentry);
 178                 } else {
 179                         spin_unlock(&dentry->d_lock);
 180                 }
 181         }
 182         shrink_dcache_parent(dir);
 183         mutex_unlock(&dir->d_inode->i_mutex);
 184 }
 185
 186 /* Caller must hold parent->i_mutex */
 187 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 188 {
 189         /* remove all entries */
 190         spufs_prune_dir(dir);
 191         d_drop(dir);
 192
 193         return simple_rmdir(parent, dir);
 194 }
 195
 196 static int spufs_fill_dir(struct dentry *dir,
 197                 const struct spufs_tree_descr *files, int mode,
 198                 struct spu_context *ctx)
 199 {
 200         struct dentry *dentry, *tmp;
 201         int ret;
 202
 203         while (files->name && files->name[0]) {
 204                 ret = -ENOMEM;
 205                 dentry = d_alloc_name(dir, files->name);
 206                 if (!dentry)
 207                         goto out;
 208                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 209                                         files->mode & mode, files->size, ctx);
 210                 if (ret)
 211                         goto out;
 212                 files++;
 213         }
 214         return 0;
 215 out:
 216         /*
 217          * remove all children from dir. dir->inode is not set so don't
 218          * just simply use spufs_prune_dir() and panic afterwards :)
 219          * dput() looks like it will do the right thing:
 220          * - dec parent's ref counter
 221          * - remove child from parent's child list
 222          * - free child's inode if possible
 223          * - free child
 224          */
 225         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 226                 dput(dentry);
 227         }
 228
 229         shrink_dcache_parent(dir);
 230         return ret;
 231 }
 232
 233 static int spufs_dir_close(struct inode *inode, struct file *file)
 234 {
 235         struct spu_context *ctx;
 236         struct inode *parent;
 237         struct dentry *dir;
 238         int ret;
 239
 240         dir = file->f_path.dentry;
 241         parent = dir->d_parent->d_inode;
 242         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 243
 244         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
 245         ret = spufs_rmdir(parent, dir);
 246         mutex_unlock(&parent->i_mutex);
 247         WARN_ON(ret);
 248
 249         /* We have to give up the mm_struct */
 250         spu_forget(ctx);
 251
 252         return dcache_dir_close(inode, file);
 253 }
 254
 255 const struct file_operations spufs_context_fops = {
 256         .open           = dcache_dir_open,
 257         .release        = spufs_dir_close,
 258         .llseek         = dcache_dir_lseek,
 259         .read           = generic_read_dir,
 260         .readdir        = dcache_readdir,
 261         .fsync          = noop_fsync,
 262 };
 263 EXPORT_SYMBOL_GPL(spufs_context_fops);
 264
 265 static int
 266 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 267                 int mode)
 268 {
 269         int ret;
 270         struct inode *inode;
 271         struct spu_context *ctx;
 272
 273         ret = -ENOSPC;
 274         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 275         if (!inode)
 276                 goto out;
 277
 278         if (dir->i_mode & S_ISGID) {
 279                 inode->i_gid = dir->i_gid;
 280                 inode->i_mode &= S_ISGID;
 281         }
 282         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 283         SPUFS_I(inode)->i_ctx = ctx;
 284         if (!ctx)
 285                 goto out_iput;
 286
 287         ctx->flags = flags;
 288         inode->i_op = &simple_dir_inode_operations;
 289         inode->i_fop = &simple_dir_operations;
 290         if (flags & SPU_CREATE_NOSCHED)
 291                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 292                                          mode, ctx);
 293         else
 294                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 295
 296         if (ret)
 297                 goto out_free_ctx;
 298
 299         if (spufs_get_sb_info(dir->i_sb)->debug)
 300                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 301                                 mode, ctx);
 302
 303         if (ret)
 304                 goto out_free_ctx;
 305
 306         d_instantiate(dentry, inode);
 307         dget(dentry);
 308         inc_nlink(dir);
 309         inc_nlink(dentry->d_inode);
 310         goto out;
 311
 312 out_free_ctx:
 313         spu_forget(ctx);
 314         put_spu_context(ctx);
 315 out_iput:
 316         iput(inode);
 317 out:
 318         return ret;
 319 }
 320
 321 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 322 {
 323         int ret;
 324         struct file *filp;
 325
 326         ret = get_unused_fd();
 327         if (ret < 0) {
 328                 dput(dentry);
 329                 mntput(mnt);
 330                 goto out;
 331         }
 332
 333         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 334         if (IS_ERR(filp)) {
 335                 put_unused_fd(ret);
 336                 ret = PTR_ERR(filp);
 337                 goto out;
 338         }
 339
 340         filp->f_op = &spufs_context_fops;
 341         fd_install(ret, filp);
 342 out:
 343         return ret;
 344 }
 345
 346 static struct spu_context *
 347 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 348                                                 struct file *filp)
 349 {
 350         struct spu_context *tmp, *neighbor, *err;
 351         int count, node;
 352         int aff_supp;
 353
 354         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 355                                         struct spu, cbe_list))->aff_list);
 356
 357         if (!aff_supp)
 358                 return ERR_PTR(-EINVAL);
 359
 360         if (flags & SPU_CREATE_GANG)
 361                 return ERR_PTR(-EINVAL);
 362
 363         if (flags & SPU_CREATE_AFFINITY_MEM &&
 364             gang->aff_ref_ctx &&
 365             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 366                 return ERR_PTR(-EEXIST);
 367
 368         if (gang->aff_flags & AFF_MERGED)
 369                 return ERR_PTR(-EBUSY);
 370
 371         neighbor = NULL;
 372         if (flags & SPU_CREATE_AFFINITY_SPU) {
 373                 if (!filp || filp->f_op != &spufs_context_fops)
 374                         return ERR_PTR(-EINVAL);
 375
 376                 neighbor = get_spu_context(
 377                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
 378
 379                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 380                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 381                     !list_entry(neighbor->aff_list.next, struct spu_context,
 382                     aff_list)->aff_head) {
 383                         err = ERR_PTR(-EEXIST);
 384                         goto out_put_neighbor;
 385                 }
 386
 387                 if (gang != neighbor->gang) {
 388                         err = ERR_PTR(-EINVAL);
 389                         goto out_put_neighbor;
 390                 }
 391
 392                 count = 1;
 393                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 394                         count++;
 395                 if (list_empty(&neighbor->aff_list))
 396                         count++;
 397
 398                 for (node = 0; node < MAX_NUMNODES; node++) {
 399                         if ((cbe_spu_info[node].n_spus - atomic_read(
 400                                 &cbe_spu_info[node].reserved_spus)) >= count)
 401                                 break;
 402                 }
 403
 404                 if (node == MAX_NUMNODES) {
 405                         err = ERR_PTR(-EEXIST);
 406                         goto out_put_neighbor;
 407                 }
 408         }
 409
 410         return neighbor;
 411
 412 out_put_neighbor:
 413         put_spu_context(neighbor);
 414         return err;
 415 }
 416
 417 static void
 418 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 419                                         struct spu_context *neighbor)
 420 {
 421         if (flags & SPU_CREATE_AFFINITY_MEM)
 422                 ctx->gang->aff_ref_ctx = ctx;
 423
 424         if (flags & SPU_CREATE_AFFINITY_SPU) {
 425                 if (list_empty(&neighbor->aff_list)) {
 426                         list_add_tail(&neighbor->aff_list,
 427                                 &ctx->gang->aff_list_head);
 428                         neighbor->aff_head = 1;
 429                 }
 430
 431                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 432                     || list_entry(neighbor->aff_list.next, struct spu_context,
 433                                                         aff_list)->aff_head) {
 434                         list_add(&ctx->aff_list, &neighbor->aff_list);
 435                 } else  {
 436                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 437                         if (neighbor->aff_head) {
 438                                 neighbor->aff_head = 0;
 439                                 ctx->aff_head = 1;
 440                         }
 441                 }
 442
 443                 if (!ctx->gang->aff_ref_ctx)
 444                         ctx->gang->aff_ref_ctx = ctx;
 445         }
 446 }
 447
 448 static int
 449 spufs_create_context(struct inode *inode, struct dentry *dentry,
 450                         struct vfsmount *mnt, int flags, int mode,
 451                         struct file *aff_filp)
 452 {
 453         int ret;
 454         int affinity;
 455         struct spu_gang *gang;
 456         struct spu_context *neighbor;
 457
 458         ret = -EPERM;
 459         if ((flags & SPU_CREATE_NOSCHED) &&
 460             !capable(CAP_SYS_NICE))
 461                 goto out_unlock;
 462
 463         ret = -EINVAL;
 464         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 465             == SPU_CREATE_ISOLATE)
 466                 goto out_unlock;
 467
 468         ret = -ENODEV;
 469         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 470                 goto out_unlock;
 471
 472         gang = NULL;
 473         neighbor = NULL;
 474         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 475         if (affinity) {
 476                 gang = SPUFS_I(inode)->i_gang;
 477                 ret = -EINVAL;
 478                 if (!gang)
 479                         goto out_unlock;
 480                 mutex_lock(&gang->aff_mutex);
 481                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 482                 if (IS_ERR(neighbor)) {
 483                         ret = PTR_ERR(neighbor);
 484                         goto out_aff_unlock;
 485                 }
 486         }
 487
 488         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 489         if (ret)
 490                 goto out_aff_unlock;
 491
 492         if (affinity) {
 493                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 494                                                                 neighbor);
 495                 if (neighbor)
 496                         put_spu_context(neighbor);
 497         }
 498
 499         /*
 500          * get references for dget and mntget, will be released
 501          * in error path of *_open().
 502          */
 503         ret = spufs_context_open(dget(dentry), mntget(mnt));
 504         if (ret < 0) {
 505                 WARN_ON(spufs_rmdir(inode, dentry));
 506                 if (affinity)
 507                         mutex_unlock(&gang->aff_mutex);
 508                 mutex_unlock(&inode->i_mutex);
 509                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 510                 goto out;
 511         }
 512
 513 out_aff_unlock:
 514         if (affinity)
 515                 mutex_unlock(&gang->aff_mutex);
 516 out_unlock:
 517         mutex_unlock(&inode->i_mutex);
 518 out:
 519         dput(dentry);
 520         return ret;
 521 }
 522
 523 static int
 524 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
 525 {
 526         int ret;
 527         struct inode *inode;
 528         struct spu_gang *gang;
 529
 530         ret = -ENOSPC;
 531         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 532         if (!inode)
 533                 goto out;
 534
 535         ret = 0;
 536         if (dir->i_mode & S_ISGID) {
 537                 inode->i_gid = dir->i_gid;
 538                 inode->i_mode &= S_ISGID;
 539         }
 540         gang = alloc_spu_gang();
 541         SPUFS_I(inode)->i_ctx = NULL;
 542         SPUFS_I(inode)->i_gang = gang;
 543         if (!gang)
 544                 goto out_iput;
 545
 546         inode->i_op = &simple_dir_inode_operations;
 547         inode->i_fop = &simple_dir_operations;
 548
 549         d_instantiate(dentry, inode);
 550         inc_nlink(dir);
 551         inc_nlink(dentry->d_inode);
 552         return ret;
 553
 554 out_iput:
 555         iput(inode);
 556 out:
 557         return ret;
 558 }
 559
 560 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 561 {
 562         int ret;
 563         struct file *filp;
 564
 565         ret = get_unused_fd();
 566         if (ret < 0) {
 567                 dput(dentry);
 568                 mntput(mnt);
 569                 goto out;
 570         }
 571
 572         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 573         if (IS_ERR(filp)) {
 574                 put_unused_fd(ret);
 575                 ret = PTR_ERR(filp);
 576                 goto out;
 577         }
 578
 579         filp->f_op = &simple_dir_operations;
 580         fd_install(ret, filp);
 581 out:
 582         return ret;
 583 }
 584
 585 static int spufs_create_gang(struct inode *inode,
 586                         struct dentry *dentry,
 587                         struct vfsmount *mnt, int mode)
 588 {
 589         int ret;
 590
 591         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 592         if (ret)
 593                 goto out;
 594
 595         /*
 596          * get references for dget and mntget, will be released
 597          * in error path of *_open().
 598          */
 599         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 600         if (ret < 0) {
 601                 int err = simple_rmdir(inode, dentry);
 602                 WARN_ON(err);
 603         }
 604
 605 out:
 606         mutex_unlock(&inode->i_mutex);
 607         dput(dentry);
 608         return ret;
 609 }
 610
 611
 612 static struct file_system_type spufs_type;
 613
 614 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
 615                                                         struct file *filp)
 616 {
 617         struct dentry *dentry;
 618         int ret;
 619
 620         ret = -EINVAL;
 621         /* check if we are on spufs */
 622         if (nd->path.dentry->d_sb->s_type != &spufs_type)
 623                 goto out;
 624
 625         /* don't accept undefined flags */
 626         if (flags & (~SPU_CREATE_FLAG_ALL))
 627                 goto out;
 628
 629         /* only threads can be underneath a gang */
 630         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
 631                 if ((flags & SPU_CREATE_GANG) ||
 632                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
 633                         goto out;
 634         }
 635
 636         dentry = lookup_create(nd, 1);
 637         ret = PTR_ERR(dentry);
 638         if (IS_ERR(dentry))
 639                 goto out_dir;
 640
 641         mode &= ~current_umask();
 642
 643         if (flags & SPU_CREATE_GANG)
 644                 ret = spufs_create_gang(nd->path.dentry->d_inode,
 645                                          dentry, nd->path.mnt, mode);
 646         else
 647                 ret = spufs_create_context(nd->path.dentry->d_inode,
 648                                             dentry, nd->path.mnt, flags, mode,
 649                                             filp);
 650         if (ret >= 0)
 651                 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
 652         return ret;
 653
 654 out_dir:
 655         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
 656 out:
 657         return ret;
 658 }
 659
 660 /* File system initialization */
 661 enum {
 662         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 663 };
 664
 665 static const match_table_t spufs_tokens = {
 666         { Opt_uid,   "uid=%d" },
 667         { Opt_gid,   "gid=%d" },
 668         { Opt_mode,  "mode=%o" },
 669         { Opt_debug, "debug" },
 670         { Opt_err,    NULL  },
 671 };
 672
 673 static int
 674 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 675 {
 676         char *p;
 677         substring_t args[MAX_OPT_ARGS];
 678
 679         while ((p = strsep(&options, ",")) != NULL) {
 680                 int token, option;
 681
 682                 if (!*p)
 683                         continue;
 684
 685                 token = match_token(p, spufs_tokens, args);
 686                 switch (token) {
 687                 case Opt_uid:
 688                         if (match_int(&args[0], &option))
 689                                 return 0;
 690                         root->i_uid = option;
 691                         break;
 692                 case Opt_gid:
 693                         if (match_int(&args[0], &option))
 694                                 return 0;
 695                         root->i_gid = option;
 696                         break;
 697                 case Opt_mode:
 698                         if (match_octal(&args[0], &option))
 699                                 return 0;
 700                         root->i_mode = option | S_IFDIR;
 701                         break;
 702                 case Opt_debug:
 703                         spufs_get_sb_info(sb)->debug = 1;
 704                         break;
 705                 default:
 706                         return 0;
 707                 }
 708         }
 709         return 1;
 710 }
 711
 712 static void spufs_exit_isolated_loader(void)
 713 {
 714         free_pages((unsigned long) isolated_loader,
 715                         get_order(isolated_loader_size));
 716 }
 717
 718 static void
 719 spufs_init_isolated_loader(void)
 720 {
 721         struct device_node *dn;
 722         const char *loader;
 723         int size;
 724
 725         dn = of_find_node_by_path("/spu-isolation");
 726         if (!dn)
 727                 return;
 728
 729         loader = of_get_property(dn, "loader", &size);
 730         if (!loader)
 731                 return;
 732
 733         /* the loader must be align on a 16 byte boundary */
 734         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 735         if (!isolated_loader)
 736                 return;
 737
 738         isolated_loader_size = size;
 739         memcpy(isolated_loader, loader, size);
 740         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 741 }
 742
 743 static int
 744 spufs_create_root(struct super_block *sb, void *data)
 745 {
 746         struct inode *inode;
 747         int ret;
 748
 749         ret = -ENODEV;
 750         if (!spu_management_ops)
 751                 goto out;
 752
 753         ret = -ENOMEM;
 754         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 755         if (!inode)
 756                 goto out;
 757
 758         inode->i_op = &simple_dir_inode_operations;
 759         inode->i_fop = &simple_dir_operations;
 760         SPUFS_I(inode)->i_ctx = NULL;
 761         inc_nlink(inode);
 762
 763         ret = -EINVAL;
 764         if (!spufs_parse_options(sb, data, inode))
 765                 goto out_iput;
 766
 767         ret = -ENOMEM;
 768         sb->s_root = d_alloc_root(inode);
 769         if (!sb->s_root)
 770                 goto out_iput;
 771
 772         return 0;
 773 out_iput:
 774         iput(inode);
 775 out:
 776         return ret;
 777 }
 778
 779 static int
 780 spufs_fill_super(struct super_block *sb, void *data, int silent)
 781 {
 782         struct spufs_sb_info *info;
 783         static const struct super_operations s_ops = {
 784                 .alloc_inode = spufs_alloc_inode,
 785                 .destroy_inode = spufs_destroy_inode,
 786                 .statfs = simple_statfs,
 787                 .evict_inode = spufs_evict_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 struct dentry *
 808 spufs_mount(struct file_system_type *fstype, int flags,
 809                 const char *name, void *data)
 810 {
 811         return mount_single(fstype, flags, data, spufs_fill_super);
 812 }
 813
 814 static struct file_system_type spufs_type = {
 815         .owner = THIS_MODULE,
 816         .name = "spufs",
 817         .mount = spufs_mount,
 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