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_ino = get_next_ino();
 104         inode->i_mode = mode;
 105         inode->i_uid = current_fsuid();
 106         inode->i_gid = current_fsgid();
 107         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 108 out:
 109         return inode;
 110 }
 111
 112 static int
 113 spufs_setattr(struct dentry *dentry, struct iattr *attr)
 114 {
 115         struct inode *inode = dentry->d_inode;
 116
 117         if ((attr->ia_valid & ATTR_SIZE) &&
 118             (attr->ia_size != inode->i_size))
 119                 return -EINVAL;
 120         setattr_copy(inode, attr);
 121         mark_inode_dirty(inode);
 122         return 0;
 123 }
 124
 125
 126 static int
 127 spufs_new_file(struct super_block *sb, struct dentry *dentry,
 128                 const struct file_operations *fops, int mode,
 129                 size_t size, struct spu_context *ctx)
 130 {
 131         static const struct inode_operations spufs_file_iops = {
 132                 .setattr = spufs_setattr,
 133         };
 134         struct inode *inode;
 135         int ret;
 136
 137         ret = -ENOSPC;
 138         inode = spufs_new_inode(sb, S_IFREG | mode);
 139         if (!inode)
 140                 goto out;
 141
 142         ret = 0;
 143         inode->i_op = &spufs_file_iops;
 144         inode->i_fop = fops;
 145         inode->i_size = size;
 146         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 147         d_add(dentry, inode);
 148 out:
 149         return ret;
 150 }
 151
 152 static void
 153 spufs_evict_inode(struct inode *inode)
 154 {
 155         struct spufs_inode_info *ei = SPUFS_I(inode);
 156         end_writeback(inode);
 157         if (ei->i_ctx)
 158                 put_spu_context(ei->i_ctx);
 159         if (ei->i_gang)
 160                 put_spu_gang(ei->i_gang);
 161 }
 162
 163 static void spufs_prune_dir(struct dentry *dir)
 164 {
 165         struct dentry *dentry, *tmp;
 166
 167         mutex_lock(&dir->d_inode->i_mutex);
 168         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 169                 spin_lock(&dentry->d_lock);
 170                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
 171                         dget_dlock(dentry);
 172                         __d_drop(dentry);
 173                         spin_unlock(&dentry->d_lock);
 174                         simple_unlink(dir->d_inode, dentry);
 175                         /* XXX: what was dcache_lock protecting here? Other
 176                          * filesystems (IB, configfs) release dcache_lock
 177                          * before unlink */
 178                         dput(dentry);
 179                 } else {
 180                         spin_unlock(&dentry->d_lock);
 181                 }
 182         }
 183         shrink_dcache_parent(dir);
 184         mutex_unlock(&dir->d_inode->i_mutex);
 185 }
 186
 187 /* Caller must hold parent->i_mutex */
 188 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 189 {
 190         /* remove all entries */
 191         spufs_prune_dir(dir);
 192         d_drop(dir);
 193
 194         return simple_rmdir(parent, dir);
 195 }
 196
 197 static int spufs_fill_dir(struct dentry *dir,
 198                 const struct spufs_tree_descr *files, int mode,
 199                 struct spu_context *ctx)
 200 {
 201         struct dentry *dentry, *tmp;
 202         int ret;
 203
 204         while (files->name && files->name[0]) {
 205                 ret = -ENOMEM;
 206                 dentry = d_alloc_name(dir, files->name);
 207                 if (!dentry)
 208                         goto out;
 209                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 210                                         files->mode & mode, files->size, ctx);
 211                 if (ret)
 212                         goto out;
 213                 files++;
 214         }
 215         return 0;
 216 out:
 217         /*
 218          * remove all children from dir. dir->inode is not set so don't
 219          * just simply use spufs_prune_dir() and panic afterwards :)
 220          * dput() looks like it will do the right thing:
 221          * - dec parent's ref counter
 222          * - remove child from parent's child list
 223          * - free child's inode if possible
 224          * - free child
 225          */
 226         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 227                 dput(dentry);
 228         }
 229
 230         shrink_dcache_parent(dir);
 231         return ret;
 232 }
 233
 234 static int spufs_dir_close(struct inode *inode, struct file *file)
 235 {
 236         struct spu_context *ctx;
 237         struct inode *parent;
 238         struct dentry *dir;
 239         int ret;
 240
 241         dir = file->f_path.dentry;
 242         parent = dir->d_parent->d_inode;
 243         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 244
 245         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
 246         ret = spufs_rmdir(parent, dir);
 247         mutex_unlock(&parent->i_mutex);
 248         WARN_ON(ret);
 249
 250         /* We have to give up the mm_struct */
 251         spu_forget(ctx);
 252
 253         return dcache_dir_close(inode, file);
 254 }
 255
 256 const struct file_operations spufs_context_fops = {
 257         .open           = dcache_dir_open,
 258         .release        = spufs_dir_close,
 259         .llseek         = dcache_dir_lseek,
 260         .read           = generic_read_dir,
 261         .readdir        = dcache_readdir,
 262         .fsync          = noop_fsync,
 263 };
 264 EXPORT_SYMBOL_GPL(spufs_context_fops);
 265
 266 static int
 267 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 268                 int mode)
 269 {
 270         int ret;
 271         struct inode *inode;
 272         struct spu_context *ctx;
 273
 274         ret = -ENOSPC;
 275         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 276         if (!inode)
 277                 goto out;
 278
 279         if (dir->i_mode & S_ISGID) {
 280                 inode->i_gid = dir->i_gid;
 281                 inode->i_mode &= S_ISGID;
 282         }
 283         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 284         SPUFS_I(inode)->i_ctx = ctx;
 285         if (!ctx)
 286                 goto out_iput;
 287
 288         ctx->flags = flags;
 289         inode->i_op = &simple_dir_inode_operations;
 290         inode->i_fop = &simple_dir_operations;
 291         if (flags & SPU_CREATE_NOSCHED)
 292                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 293                                          mode, ctx);
 294         else
 295                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 296
 297         if (ret)
 298                 goto out_free_ctx;
 299
 300         if (spufs_get_sb_info(dir->i_sb)->debug)
 301                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 302                                 mode, ctx);
 303
 304         if (ret)
 305                 goto out_free_ctx;
 306
 307         d_instantiate(dentry, inode);
 308         dget(dentry);
 309         inc_nlink(dir);
 310         inc_nlink(dentry->d_inode);
 311         goto out;
 312
 313 out_free_ctx:
 314         spu_forget(ctx);
 315         put_spu_context(ctx);
 316 out_iput:
 317         iput(inode);
 318 out:
 319         return ret;
 320 }
 321
 322 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 323 {
 324         int ret;
 325         struct file *filp;
 326
 327         ret = get_unused_fd();
 328         if (ret < 0) {
 329                 dput(dentry);
 330                 mntput(mnt);
 331                 goto out;
 332         }
 333
 334         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 335         if (IS_ERR(filp)) {
 336                 put_unused_fd(ret);
 337                 ret = PTR_ERR(filp);
 338                 goto out;
 339         }
 340
 341         filp->f_op = &spufs_context_fops;
 342         fd_install(ret, filp);
 343 out:
 344         return ret;
 345 }
 346
 347 static struct spu_context *
 348 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 349                                                 struct file *filp)
 350 {
 351         struct spu_context *tmp, *neighbor, *err;
 352         int count, node;
 353         int aff_supp;
 354
 355         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 356                                         struct spu, cbe_list))->aff_list);
 357
 358         if (!aff_supp)
 359                 return ERR_PTR(-EINVAL);
 360
 361         if (flags & SPU_CREATE_GANG)
 362                 return ERR_PTR(-EINVAL);
 363
 364         if (flags & SPU_CREATE_AFFINITY_MEM &&
 365             gang->aff_ref_ctx &&
 366             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 367                 return ERR_PTR(-EEXIST);
 368
 369         if (gang->aff_flags & AFF_MERGED)
 370                 return ERR_PTR(-EBUSY);
 371
 372         neighbor = NULL;
 373         if (flags & SPU_CREATE_AFFINITY_SPU) {
 374                 if (!filp || filp->f_op != &spufs_context_fops)
 375                         return ERR_PTR(-EINVAL);
 376
 377                 neighbor = get_spu_context(
 378                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
 379
 380                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 381                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 382                     !list_entry(neighbor->aff_list.next, struct spu_context,
 383                     aff_list)->aff_head) {
 384                         err = ERR_PTR(-EEXIST);
 385                         goto out_put_neighbor;
 386                 }
 387
 388                 if (gang != neighbor->gang) {
 389                         err = ERR_PTR(-EINVAL);
 390                         goto out_put_neighbor;
 391                 }
 392
 393                 count = 1;
 394                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 395                         count++;
 396                 if (list_empty(&neighbor->aff_list))
 397                         count++;
 398
 399                 for (node = 0; node < MAX_NUMNODES; node++) {
 400                         if ((cbe_spu_info[node].n_spus - atomic_read(
 401                                 &cbe_spu_info[node].reserved_spus)) >= count)
 402                                 break;
 403                 }
 404
 405                 if (node == MAX_NUMNODES) {
 406                         err = ERR_PTR(-EEXIST);
 407                         goto out_put_neighbor;
 408                 }
 409         }
 410
 411         return neighbor;
 412
 413 out_put_neighbor:
 414         put_spu_context(neighbor);
 415         return err;
 416 }
 417
 418 static void
 419 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 420                                         struct spu_context *neighbor)
 421 {
 422         if (flags & SPU_CREATE_AFFINITY_MEM)
 423                 ctx->gang->aff_ref_ctx = ctx;
 424
 425         if (flags & SPU_CREATE_AFFINITY_SPU) {
 426                 if (list_empty(&neighbor->aff_list)) {
 427                         list_add_tail(&neighbor->aff_list,
 428                                 &ctx->gang->aff_list_head);
 429                         neighbor->aff_head = 1;
 430                 }
 431
 432                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 433                     || list_entry(neighbor->aff_list.next, struct spu_context,
 434                                                         aff_list)->aff_head) {
 435                         list_add(&ctx->aff_list, &neighbor->aff_list);
 436                 } else  {
 437                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 438                         if (neighbor->aff_head) {
 439                                 neighbor->aff_head = 0;
 440                                 ctx->aff_head = 1;
 441                         }
 442                 }
 443
 444                 if (!ctx->gang->aff_ref_ctx)
 445                         ctx->gang->aff_ref_ctx = ctx;
 446         }
 447 }
 448
 449 static int
 450 spufs_create_context(struct inode *inode, struct dentry *dentry,
 451                         struct vfsmount *mnt, int flags, int mode,
 452                         struct file *aff_filp)
 453 {
 454         int ret;
 455         int affinity;
 456         struct spu_gang *gang;
 457         struct spu_context *neighbor;
 458
 459         ret = -EPERM;
 460         if ((flags & SPU_CREATE_NOSCHED) &&
 461             !capable(CAP_SYS_NICE))
 462                 goto out_unlock;
 463
 464         ret = -EINVAL;
 465         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 466             == SPU_CREATE_ISOLATE)
 467                 goto out_unlock;
 468
 469         ret = -ENODEV;
 470         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 471                 goto out_unlock;
 472
 473         gang = NULL;
 474         neighbor = NULL;
 475         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 476         if (affinity) {
 477                 gang = SPUFS_I(inode)->i_gang;
 478                 ret = -EINVAL;
 479                 if (!gang)
 480                         goto out_unlock;
 481                 mutex_lock(&gang->aff_mutex);
 482                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 483                 if (IS_ERR(neighbor)) {
 484                         ret = PTR_ERR(neighbor);
 485                         goto out_aff_unlock;
 486                 }
 487         }
 488
 489         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 490         if (ret)
 491                 goto out_aff_unlock;
 492
 493         if (affinity) {
 494                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 495                                                                 neighbor);
 496                 if (neighbor)
 497                         put_spu_context(neighbor);
 498         }
 499
 500         /*
 501          * get references for dget and mntget, will be released
 502          * in error path of *_open().
 503          */
 504         ret = spufs_context_open(dget(dentry), mntget(mnt));
 505         if (ret < 0) {
 506                 WARN_ON(spufs_rmdir(inode, dentry));
 507                 if (affinity)
 508                         mutex_unlock(&gang->aff_mutex);
 509                 mutex_unlock(&inode->i_mutex);
 510                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 511                 goto out;
 512         }
 513
 514 out_aff_unlock:
 515         if (affinity)
 516                 mutex_unlock(&gang->aff_mutex);
 517 out_unlock:
 518         mutex_unlock(&inode->i_mutex);
 519 out:
 520         dput(dentry);
 521         return ret;
 522 }
 523
 524 static int
 525 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
 526 {
 527         int ret;
 528         struct inode *inode;
 529         struct spu_gang *gang;
 530
 531         ret = -ENOSPC;
 532         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 533         if (!inode)
 534                 goto out;
 535
 536         ret = 0;
 537         if (dir->i_mode & S_ISGID) {
 538                 inode->i_gid = dir->i_gid;
 539                 inode->i_mode &= S_ISGID;
 540         }
 541         gang = alloc_spu_gang();
 542         SPUFS_I(inode)->i_ctx = NULL;
 543         SPUFS_I(inode)->i_gang = gang;
 544         if (!gang)
 545                 goto out_iput;
 546
 547         inode->i_op = &simple_dir_inode_operations;
 548         inode->i_fop = &simple_dir_operations;
 549
 550         d_instantiate(dentry, inode);
 551         inc_nlink(dir);
 552         inc_nlink(dentry->d_inode);
 553         return ret;
 554
 555 out_iput:
 556         iput(inode);
 557 out:
 558         return ret;
 559 }
 560
 561 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 562 {
 563         int ret;
 564         struct file *filp;
 565
 566         ret = get_unused_fd();
 567         if (ret < 0) {
 568                 dput(dentry);
 569                 mntput(mnt);
 570                 goto out;
 571         }
 572
 573         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 574         if (IS_ERR(filp)) {
 575                 put_unused_fd(ret);
 576                 ret = PTR_ERR(filp);
 577                 goto out;
 578         }
 579
 580         filp->f_op = &simple_dir_operations;
 581         fd_install(ret, filp);
 582 out:
 583         return ret;
 584 }
 585
 586 static int spufs_create_gang(struct inode *inode,
 587                         struct dentry *dentry,
 588                         struct vfsmount *mnt, int mode)
 589 {
 590         int ret;
 591
 592         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 593         if (ret)
 594                 goto out;
 595
 596         /*
 597          * get references for dget and mntget, will be released
 598          * in error path of *_open().
 599          */
 600         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 601         if (ret < 0) {
 602                 int err = simple_rmdir(inode, dentry);
 603                 WARN_ON(err);
 604         }
 605
 606 out:
 607         mutex_unlock(&inode->i_mutex);
 608         dput(dentry);
 609         return ret;
 610 }
 611
 612
 613 static struct file_system_type spufs_type;
 614
 615 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
 616                                                         struct file *filp)
 617 {
 618         struct dentry *dentry;
 619         int ret;
 620
 621         ret = -EINVAL;
 622         /* check if we are on spufs */
 623         if (nd->path.dentry->d_sb->s_type != &spufs_type)
 624                 goto out;
 625
 626         /* don't accept undefined flags */
 627         if (flags & (~SPU_CREATE_FLAG_ALL))
 628                 goto out;
 629
 630         /* only threads can be underneath a gang */
 631         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
 632                 if ((flags & SPU_CREATE_GANG) ||
 633                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
 634                         goto out;
 635         }
 636
 637         dentry = lookup_create(nd, 1);
 638         ret = PTR_ERR(dentry);
 639         if (IS_ERR(dentry))
 640                 goto out_dir;
 641
 642         mode &= ~current_umask();
 643
 644         if (flags & SPU_CREATE_GANG)
 645                 ret = spufs_create_gang(nd->path.dentry->d_inode,
 646                                          dentry, nd->path.mnt, mode);
 647         else
 648                 ret = spufs_create_context(nd->path.dentry->d_inode,
 649                                             dentry, nd->path.mnt, flags, mode,
 650                                             filp);
 651         if (ret >= 0)
 652                 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
 653         return ret;
 654
 655 out_dir:
 656         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
 657 out:
 658         return ret;
 659 }
 660
 661 /* File system initialization */
 662 enum {
 663         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 664 };
 665
 666 static const match_table_t spufs_tokens = {
 667         { Opt_uid,   "uid=%d" },
 668         { Opt_gid,   "gid=%d" },
 669         { Opt_mode,  "mode=%o" },
 670         { Opt_debug, "debug" },
 671         { Opt_err,    NULL  },
 672 };
 673
 674 static int
 675 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 676 {
 677         char *p;
 678         substring_t args[MAX_OPT_ARGS];
 679
 680         while ((p = strsep(&options, ",")) != NULL) {
 681                 int token, option;
 682
 683                 if (!*p)
 684                         continue;
 685
 686                 token = match_token(p, spufs_tokens, args);
 687                 switch (token) {
 688                 case Opt_uid:
 689                         if (match_int(&args[0], &option))
 690                                 return 0;
 691                         root->i_uid = option;
 692                         break;
 693                 case Opt_gid:
 694                         if (match_int(&args[0], &option))
 695                                 return 0;
 696                         root->i_gid = option;
 697                         break;
 698                 case Opt_mode:
 699                         if (match_octal(&args[0], &option))
 700                                 return 0;
 701                         root->i_mode = option | S_IFDIR;
 702                         break;
 703                 case Opt_debug:
 704                         spufs_get_sb_info(sb)->debug = 1;
 705                         break;
 706                 default:
 707                         return 0;
 708                 }
 709         }
 710         return 1;
 711 }
 712
 713 static void spufs_exit_isolated_loader(void)
 714 {
 715         free_pages((unsigned long) isolated_loader,
 716                         get_order(isolated_loader_size));
 717 }
 718
 719 static void
 720 spufs_init_isolated_loader(void)
 721 {
 722         struct device_node *dn;
 723         const char *loader;
 724         int size;
 725
 726         dn = of_find_node_by_path("/spu-isolation");
 727         if (!dn)
 728                 return;
 729
 730         loader = of_get_property(dn, "loader", &size);
 731         if (!loader)
 732                 return;
 733
 734         /* the loader must be align on a 16 byte boundary */
 735         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 736         if (!isolated_loader)
 737                 return;
 738
 739         isolated_loader_size = size;
 740         memcpy(isolated_loader, loader, size);
 741         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 742 }
 743
 744 static int
 745 spufs_create_root(struct super_block *sb, void *data)
 746 {
 747         struct inode *inode;
 748         int ret;
 749
 750         ret = -ENODEV;
 751         if (!spu_management_ops)
 752                 goto out;
 753
 754         ret = -ENOMEM;
 755         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 756         if (!inode)
 757                 goto out;
 758
 759         inode->i_op = &simple_dir_inode_operations;
 760         inode->i_fop = &simple_dir_operations;
 761         SPUFS_I(inode)->i_ctx = NULL;
 762         inc_nlink(inode);
 763
 764         ret = -EINVAL;
 765         if (!spufs_parse_options(sb, data, inode))
 766                 goto out_iput;
 767
 768         ret = -ENOMEM;
 769         sb->s_root = d_alloc_root(inode);
 770         if (!sb->s_root)
 771                 goto out_iput;
 772
 773         return 0;
 774 out_iput:
 775         iput(inode);
 776 out:
 777         return ret;
 778 }
 779
 780 static int
 781 spufs_fill_super(struct super_block *sb, void *data, int silent)
 782 {
 783         struct spufs_sb_info *info;
 784         static const struct super_operations s_ops = {
 785                 .alloc_inode = spufs_alloc_inode,
 786                 .destroy_inode = spufs_destroy_inode,
 787                 .statfs = simple_statfs,
 788                 .evict_inode = spufs_evict_inode,
 789                 .show_options = generic_show_options,
 790         };
 791
 792         save_mount_options(sb, data);
 793
 794         info = kzalloc(sizeof(*info), GFP_KERNEL);
 795         if (!info)
 796                 return -ENOMEM;
 797
 798         sb->s_maxbytes = MAX_LFS_FILESIZE;
 799         sb->s_blocksize = PAGE_CACHE_SIZE;
 800         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 801         sb->s_magic = SPUFS_MAGIC;
 802         sb->s_op = &s_ops;
 803         sb->s_fs_info = info;
 804
 805         return spufs_create_root(sb, data);
 806 }
 807
 808 static struct dentry *
 809 spufs_mount(struct file_system_type *fstype, int flags,
 810                 const char *name, void *data)
 811 {
 812         return mount_single(fstype, flags, data, spufs_fill_super);
 813 }
 814
 815 static struct file_system_type spufs_type = {
 816         .owner = THIS_MODULE,
 817         .name = "spufs",
 818         .mount = spufs_mount,
 819         .kill_sb = kill_litter_super,
 820 };
 821
 822 static int __init spufs_init(void)
 823 {
 824         int ret;
 825
 826         ret = -ENODEV;
 827         if (!spu_management_ops)
 828                 goto out;
 829
 830         ret = -ENOMEM;
 831         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 832                         sizeof(struct spufs_inode_info), 0,
 833                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 834
 835         if (!spufs_inode_cache)
 836                 goto out;
 837         ret = spu_sched_init();
 838         if (ret)
 839                 goto out_cache;
 840         ret = register_filesystem(&spufs_type);
 841         if (ret)
 842                 goto out_sched;
 843         ret = register_spu_syscalls(&spufs_calls);
 844         if (ret)
 845                 goto out_fs;
 846
 847         spufs_init_isolated_loader();
 848
 849         return 0;
 850
 851 out_fs:
 852         unregister_filesystem(&spufs_type);
 853 out_sched:
 854         spu_sched_exit();
 855 out_cache:
 856         kmem_cache_destroy(spufs_inode_cache);
 857 out:
 858         return ret;
 859 }
 860 module_init(spufs_init);
 861
 862 static void __exit spufs_exit(void)
 863 {
 864         spu_sched_exit();
 865         spufs_exit_isolated_loader();
 866         unregister_spu_syscalls(&spufs_calls);
 867         unregister_filesystem(&spufs_type);
 868         kmem_cache_destroy(spufs_inode_cache);
 869 }
 870 module_exit(spufs_exit);
 871
 872 MODULE_LICENSE("GPL");
 873 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 874