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

   1 /*
   2  * SPU file system
   3  *
   4  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
   5  *
   6  * Author: Arnd Bergmann <arndb@de.ibm.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/file.h>
  24 #include <linux/fs.h>
  25 #include <linux/backing-dev.h>
  26 #include <linux/init.h>
  27 #include <linux/ioctl.h>
  28 #include <linux/module.h>
  29 #include <linux/mount.h>
  30 #include <linux/namei.h>
  31 #include <linux/pagemap.h>
  32 #include <linux/poll.h>
  33 #include <linux/slab.h>
  34 #include <linux/parser.h>
  35
  36 #include <asm/prom.h>
  37 #include <asm/semaphore.h>
  38 #include <asm/spu.h>
  39 #include <asm/spu_priv1.h>
  40 #include <asm/uaccess.h>
  41
  42 #include "spufs.h"
  43
  44 static struct kmem_cache *spufs_inode_cache;
  45 char *isolated_loader;
  46 static int isolated_loader_size;
  47
  48 static struct inode *
  49 spufs_alloc_inode(struct super_block *sb)
  50 {
  51         struct spufs_inode_info *ei;
  52
  53         ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
  54         if (!ei)
  55                 return NULL;
  56
  57         ei->i_gang = NULL;
  58         ei->i_ctx = NULL;
  59         ei->i_openers = 0;
  60
  61         return &ei->vfs_inode;
  62 }
  63
  64 static void
  65 spufs_destroy_inode(struct inode *inode)
  66 {
  67         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
  68 }
  69
  70 static void
  71 spufs_init_once(struct kmem_cache *cachep, void *p)
  72 {
  73         struct spufs_inode_info *ei = p;
  74
  75         inode_init_once(&ei->vfs_inode);
  76 }
  77
  78 static struct inode *
  79 spufs_new_inode(struct super_block *sb, int mode)
  80 {
  81         struct inode *inode;
  82
  83         inode = new_inode(sb);
  84         if (!inode)
  85                 goto out;
  86
  87         inode->i_mode = mode;
  88         inode->i_uid = current->fsuid;
  89         inode->i_gid = current->fsgid;
  90         inode->i_blocks = 0;
  91         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
  92 out:
  93         return inode;
  94 }
  95
  96 static int
  97 spufs_setattr(struct dentry *dentry, struct iattr *attr)
  98 {
  99         struct inode *inode = dentry->d_inode;
 100
 101         if ((attr->ia_valid & ATTR_SIZE) &&
 102             (attr->ia_size != inode->i_size))
 103                 return -EINVAL;
 104         return inode_setattr(inode, attr);
 105 }
 106
 107
 108 static int
 109 spufs_new_file(struct super_block *sb, struct dentry *dentry,
 110                 const struct file_operations *fops, int mode,
 111                 struct spu_context *ctx)
 112 {
 113         static struct inode_operations spufs_file_iops = {
 114                 .setattr = spufs_setattr,
 115         };
 116         struct inode *inode;
 117         int ret;
 118
 119         ret = -ENOSPC;
 120         inode = spufs_new_inode(sb, S_IFREG | mode);
 121         if (!inode)
 122                 goto out;
 123
 124         ret = 0;
 125         inode->i_op = &spufs_file_iops;
 126         inode->i_fop = fops;
 127         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 128         d_add(dentry, inode);
 129 out:
 130         return ret;
 131 }
 132
 133 static void
 134 spufs_delete_inode(struct inode *inode)
 135 {
 136         struct spufs_inode_info *ei = SPUFS_I(inode);
 137
 138         if (ei->i_ctx)
 139                 put_spu_context(ei->i_ctx);
 140         if (ei->i_gang)
 141                 put_spu_gang(ei->i_gang);
 142         clear_inode(inode);
 143 }
 144
 145 static void spufs_prune_dir(struct dentry *dir)
 146 {
 147         struct dentry *dentry, *tmp;
 148
 149         mutex_lock(&dir->d_inode->i_mutex);
 150         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 151                 spin_lock(&dcache_lock);
 152                 spin_lock(&dentry->d_lock);
 153                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
 154                         dget_locked(dentry);
 155                         __d_drop(dentry);
 156                         spin_unlock(&dentry->d_lock);
 157                         simple_unlink(dir->d_inode, dentry);
 158                         spin_unlock(&dcache_lock);
 159                         dput(dentry);
 160                 } else {
 161                         spin_unlock(&dentry->d_lock);
 162                         spin_unlock(&dcache_lock);
 163                 }
 164         }
 165         shrink_dcache_parent(dir);
 166         mutex_unlock(&dir->d_inode->i_mutex);
 167 }
 168
 169 /* Caller must hold parent->i_mutex */
 170 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 171 {
 172         /* remove all entries */
 173         spufs_prune_dir(dir);
 174         d_drop(dir);
 175
 176         return simple_rmdir(parent, dir);
 177 }
 178
 179 static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
 180                           int mode, struct spu_context *ctx)
 181 {
 182         struct dentry *dentry, *tmp;
 183         int ret;
 184
 185         while (files->name && files->name[0]) {
 186                 ret = -ENOMEM;
 187                 dentry = d_alloc_name(dir, files->name);
 188                 if (!dentry)
 189                         goto out;
 190                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 191                                         files->mode & mode, ctx);
 192                 if (ret)
 193                         goto out;
 194                 files++;
 195         }
 196         return 0;
 197 out:
 198         /*
 199          * remove all children from dir. dir->inode is not set so don't
 200          * just simply use spufs_prune_dir() and panic afterwards :)
 201          * dput() looks like it will do the right thing:
 202          * - dec parent's ref counter
 203          * - remove child from parent's child list
 204          * - free child's inode if possible
 205          * - free child
 206          */
 207         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 208                 dput(dentry);
 209         }
 210
 211         shrink_dcache_parent(dir);
 212         return ret;
 213 }
 214
 215 static int spufs_dir_close(struct inode *inode, struct file *file)
 216 {
 217         struct spu_context *ctx;
 218         struct inode *parent;
 219         struct dentry *dir;
 220         int ret;
 221
 222         dir = file->f_path.dentry;
 223         parent = dir->d_parent->d_inode;
 224         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 225
 226         mutex_lock(&parent->i_mutex);
 227         ret = spufs_rmdir(parent, dir);
 228         mutex_unlock(&parent->i_mutex);
 229         WARN_ON(ret);
 230
 231         /* We have to give up the mm_struct */
 232         spu_forget(ctx);
 233
 234         return dcache_dir_close(inode, file);
 235 }
 236
 237 const struct file_operations spufs_context_fops = {
 238         .open           = dcache_dir_open,
 239         .release        = spufs_dir_close,
 240         .llseek         = dcache_dir_lseek,
 241         .read           = generic_read_dir,
 242         .readdir        = dcache_readdir,
 243         .fsync          = simple_sync_file,
 244 };
 245 EXPORT_SYMBOL_GPL(spufs_context_fops);
 246
 247 static int
 248 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 249                 int mode)
 250 {
 251         int ret;
 252         struct inode *inode;
 253         struct spu_context *ctx;
 254
 255         ret = -ENOSPC;
 256         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 257         if (!inode)
 258                 goto out;
 259
 260         if (dir->i_mode & S_ISGID) {
 261                 inode->i_gid = dir->i_gid;
 262                 inode->i_mode &= S_ISGID;
 263         }
 264         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 265         SPUFS_I(inode)->i_ctx = ctx;
 266         if (!ctx)
 267                 goto out_iput;
 268
 269         ctx->flags = flags;
 270         inode->i_op = &simple_dir_inode_operations;
 271         inode->i_fop = &simple_dir_operations;
 272         if (flags & SPU_CREATE_NOSCHED)
 273                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 274                                          mode, ctx);
 275         else
 276                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 277
 278         if (ret)
 279                 goto out_free_ctx;
 280
 281         d_instantiate(dentry, inode);
 282         dget(dentry);
 283         dir->i_nlink++;
 284         dentry->d_inode->i_nlink++;
 285         goto out;
 286
 287 out_free_ctx:
 288         spu_forget(ctx);
 289         put_spu_context(ctx);
 290 out_iput:
 291         iput(inode);
 292 out:
 293         return ret;
 294 }
 295
 296 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 297 {
 298         int ret;
 299         struct file *filp;
 300
 301         ret = get_unused_fd();
 302         if (ret < 0) {
 303                 dput(dentry);
 304                 mntput(mnt);
 305                 goto out;
 306         }
 307
 308         filp = dentry_open(dentry, mnt, O_RDONLY);
 309         if (IS_ERR(filp)) {
 310                 put_unused_fd(ret);
 311                 ret = PTR_ERR(filp);
 312                 goto out;
 313         }
 314
 315         filp->f_op = &spufs_context_fops;
 316         fd_install(ret, filp);
 317 out:
 318         return ret;
 319 }
 320
 321 static struct spu_context *
 322 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 323                                                 struct file *filp)
 324 {
 325         struct spu_context *tmp, *neighbor;
 326         int count, node;
 327         int aff_supp;
 328
 329         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 330                                         struct spu, cbe_list))->aff_list);
 331
 332         if (!aff_supp)
 333                 return ERR_PTR(-EINVAL);
 334
 335         if (flags & SPU_CREATE_GANG)
 336                 return ERR_PTR(-EINVAL);
 337
 338         if (flags & SPU_CREATE_AFFINITY_MEM &&
 339             gang->aff_ref_ctx &&
 340             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 341                 return ERR_PTR(-EEXIST);
 342
 343         if (gang->aff_flags & AFF_MERGED)
 344                 return ERR_PTR(-EBUSY);
 345
 346         neighbor = NULL;
 347         if (flags & SPU_CREATE_AFFINITY_SPU) {
 348                 if (!filp || filp->f_op != &spufs_context_fops)
 349                         return ERR_PTR(-EINVAL);
 350
 351                 neighbor = get_spu_context(
 352                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
 353
 354                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 355                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 356                     !list_entry(neighbor->aff_list.next, struct spu_context,
 357                     aff_list)->aff_head)
 358                         return ERR_PTR(-EEXIST);
 359
 360                 if (gang != neighbor->gang)
 361                         return ERR_PTR(-EINVAL);
 362
 363                 count = 1;
 364                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 365                         count++;
 366                 if (list_empty(&neighbor->aff_list))
 367                         count++;
 368
 369                 for (node = 0; node < MAX_NUMNODES; node++) {
 370                         if ((cbe_spu_info[node].n_spus - atomic_read(
 371                                 &cbe_spu_info[node].reserved_spus)) >= count)
 372                                 break;
 373                 }
 374
 375                 if (node == MAX_NUMNODES)
 376                         return ERR_PTR(-EEXIST);
 377         }
 378
 379         return neighbor;
 380 }
 381
 382 static void
 383 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 384                                         struct spu_context *neighbor)
 385 {
 386         if (flags & SPU_CREATE_AFFINITY_MEM)
 387                 ctx->gang->aff_ref_ctx = ctx;
 388
 389         if (flags & SPU_CREATE_AFFINITY_SPU) {
 390                 if (list_empty(&neighbor->aff_list)) {
 391                         list_add_tail(&neighbor->aff_list,
 392                                 &ctx->gang->aff_list_head);
 393                         neighbor->aff_head = 1;
 394                 }
 395
 396                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 397                     || list_entry(neighbor->aff_list.next, struct spu_context,
 398                                                         aff_list)->aff_head) {
 399                         list_add(&ctx->aff_list, &neighbor->aff_list);
 400                 } else  {
 401                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 402                         if (neighbor->aff_head) {
 403                                 neighbor->aff_head = 0;
 404                                 ctx->aff_head = 1;
 405                         }
 406                 }
 407
 408                 if (!ctx->gang->aff_ref_ctx)
 409                         ctx->gang->aff_ref_ctx = ctx;
 410         }
 411 }
 412
 413 static int
 414 spufs_create_context(struct inode *inode, struct dentry *dentry,
 415                         struct vfsmount *mnt, int flags, int mode,
 416                         struct file *aff_filp)
 417 {
 418         int ret;
 419         int affinity;
 420         struct spu_gang *gang;
 421         struct spu_context *neighbor;
 422
 423         ret = -EPERM;
 424         if ((flags & SPU_CREATE_NOSCHED) &&
 425             !capable(CAP_SYS_NICE))
 426                 goto out_unlock;
 427
 428         ret = -EINVAL;
 429         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 430             == SPU_CREATE_ISOLATE)
 431                 goto out_unlock;
 432
 433         ret = -ENODEV;
 434         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 435                 goto out_unlock;
 436
 437         gang = NULL;
 438         neighbor = NULL;
 439         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 440         if (affinity) {
 441                 gang = SPUFS_I(inode)->i_gang;
 442                 ret = -EINVAL;
 443                 if (!gang)
 444                         goto out_unlock;
 445                 mutex_lock(&gang->aff_mutex);
 446                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 447                 if (IS_ERR(neighbor)) {
 448                         ret = PTR_ERR(neighbor);
 449                         goto out_aff_unlock;
 450                 }
 451         }
 452
 453         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 454         if (ret)
 455                 goto out_aff_unlock;
 456
 457         if (affinity)
 458                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 459                                                                 neighbor);
 460
 461         /*
 462          * get references for dget and mntget, will be released
 463          * in error path of *_open().
 464          */
 465         ret = spufs_context_open(dget(dentry), mntget(mnt));
 466         if (ret < 0) {
 467                 WARN_ON(spufs_rmdir(inode, dentry));
 468                 mutex_unlock(&inode->i_mutex);
 469                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 470                 goto out;
 471         }
 472
 473 out_aff_unlock:
 474         if (affinity)
 475                 mutex_unlock(&gang->aff_mutex);
 476 out_unlock:
 477         mutex_unlock(&inode->i_mutex);
 478 out:
 479         dput(dentry);
 480         return ret;
 481 }
 482
 483 static int
 484 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
 485 {
 486         int ret;
 487         struct inode *inode;
 488         struct spu_gang *gang;
 489
 490         ret = -ENOSPC;
 491         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 492         if (!inode)
 493                 goto out;
 494
 495         ret = 0;
 496         if (dir->i_mode & S_ISGID) {
 497                 inode->i_gid = dir->i_gid;
 498                 inode->i_mode &= S_ISGID;
 499         }
 500         gang = alloc_spu_gang();
 501         SPUFS_I(inode)->i_ctx = NULL;
 502         SPUFS_I(inode)->i_gang = gang;
 503         if (!gang)
 504                 goto out_iput;
 505
 506         inode->i_op = &simple_dir_inode_operations;
 507         inode->i_fop = &simple_dir_operations;
 508
 509         d_instantiate(dentry, inode);
 510         dir->i_nlink++;
 511         dentry->d_inode->i_nlink++;
 512         return ret;
 513
 514 out_iput:
 515         iput(inode);
 516 out:
 517         return ret;
 518 }
 519
 520 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 521 {
 522         int ret;
 523         struct file *filp;
 524
 525         ret = get_unused_fd();
 526         if (ret < 0) {
 527                 dput(dentry);
 528                 mntput(mnt);
 529                 goto out;
 530         }
 531
 532         filp = dentry_open(dentry, mnt, O_RDONLY);
 533         if (IS_ERR(filp)) {
 534                 put_unused_fd(ret);
 535                 ret = PTR_ERR(filp);
 536                 goto out;
 537         }
 538
 539         filp->f_op = &simple_dir_operations;
 540         fd_install(ret, filp);
 541 out:
 542         return ret;
 543 }
 544
 545 static int spufs_create_gang(struct inode *inode,
 546                         struct dentry *dentry,
 547                         struct vfsmount *mnt, int mode)
 548 {
 549         int ret;
 550
 551         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 552         if (ret)
 553                 goto out;
 554
 555         /*
 556          * get references for dget and mntget, will be released
 557          * in error path of *_open().
 558          */
 559         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 560         if (ret < 0) {
 561                 int err = simple_rmdir(inode, dentry);
 562                 WARN_ON(err);
 563         }
 564
 565 out:
 566         mutex_unlock(&inode->i_mutex);
 567         dput(dentry);
 568         return ret;
 569 }
 570
 571
 572 static struct file_system_type spufs_type;
 573
 574 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
 575                                                         struct file *filp)
 576 {
 577         struct dentry *dentry;
 578         int ret;
 579
 580         ret = -EINVAL;
 581         /* check if we are on spufs */
 582         if (nd->dentry->d_sb->s_type != &spufs_type)
 583                 goto out;
 584
 585         /* don't accept undefined flags */
 586         if (flags & (~SPU_CREATE_FLAG_ALL))
 587                 goto out;
 588
 589         /* only threads can be underneath a gang */
 590         if (nd->dentry != nd->dentry->d_sb->s_root) {
 591                 if ((flags & SPU_CREATE_GANG) ||
 592                     !SPUFS_I(nd->dentry->d_inode)->i_gang)
 593                         goto out;
 594         }
 595
 596         dentry = lookup_create(nd, 1);
 597         ret = PTR_ERR(dentry);
 598         if (IS_ERR(dentry))
 599                 goto out_dir;
 600
 601         ret = -EEXIST;
 602         if (dentry->d_inode)
 603                 goto out_dput;
 604
 605         mode &= ~current->fs->umask;
 606
 607         if (flags & SPU_CREATE_GANG)
 608                 return spufs_create_gang(nd->dentry->d_inode,
 609                                         dentry, nd->mnt, mode);
 610         else
 611                 return spufs_create_context(nd->dentry->d_inode,
 612                                         dentry, nd->mnt, flags, mode, filp);
 613
 614 out_dput:
 615         dput(dentry);
 616 out_dir:
 617         mutex_unlock(&nd->dentry->d_inode->i_mutex);
 618 out:
 619         return ret;
 620 }
 621
 622 /* File system initialization */
 623 enum {
 624         Opt_uid, Opt_gid, Opt_mode, Opt_err,
 625 };
 626
 627 static match_table_t spufs_tokens = {
 628         { Opt_uid,  "uid=%d" },
 629         { Opt_gid,  "gid=%d" },
 630         { Opt_mode, "mode=%o" },
 631         { Opt_err,   NULL  },
 632 };
 633
 634 static int
 635 spufs_parse_options(char *options, struct inode *root)
 636 {
 637         char *p;
 638         substring_t args[MAX_OPT_ARGS];
 639
 640         while ((p = strsep(&options, ",")) != NULL) {
 641                 int token, option;
 642
 643                 if (!*p)
 644                         continue;
 645
 646                 token = match_token(p, spufs_tokens, args);
 647                 switch (token) {
 648                 case Opt_uid:
 649                         if (match_int(&args[0], &option))
 650                                 return 0;
 651                         root->i_uid = option;
 652                         break;
 653                 case Opt_gid:
 654                         if (match_int(&args[0], &option))
 655                                 return 0;
 656                         root->i_gid = option;
 657                         break;
 658                 case Opt_mode:
 659                         if (match_octal(&args[0], &option))
 660                                 return 0;
 661                         root->i_mode = option | S_IFDIR;
 662                         break;
 663                 default:
 664                         return 0;
 665                 }
 666         }
 667         return 1;
 668 }
 669
 670 static void spufs_exit_isolated_loader(void)
 671 {
 672         free_pages((unsigned long) isolated_loader,
 673                         get_order(isolated_loader_size));
 674 }
 675
 676 static void
 677 spufs_init_isolated_loader(void)
 678 {
 679         struct device_node *dn;
 680         const char *loader;
 681         int size;
 682
 683         dn = of_find_node_by_path("/spu-isolation");
 684         if (!dn)
 685                 return;
 686
 687         loader = of_get_property(dn, "loader", &size);
 688         if (!loader)
 689                 return;
 690
 691         /* the loader must be align on a 16 byte boundary */
 692         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 693         if (!isolated_loader)
 694                 return;
 695
 696         isolated_loader_size = size;
 697         memcpy(isolated_loader, loader, size);
 698         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 699 }
 700
 701 static int
 702 spufs_create_root(struct super_block *sb, void *data)
 703 {
 704         struct inode *inode;
 705         int ret;
 706
 707         ret = -ENODEV;
 708         if (!spu_management_ops)
 709                 goto out;
 710
 711         ret = -ENOMEM;
 712         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 713         if (!inode)
 714                 goto out;
 715
 716         inode->i_op = &simple_dir_inode_operations;
 717         inode->i_fop = &simple_dir_operations;
 718         SPUFS_I(inode)->i_ctx = NULL;
 719
 720         ret = -EINVAL;
 721         if (!spufs_parse_options(data, inode))
 722                 goto out_iput;
 723
 724         ret = -ENOMEM;
 725         sb->s_root = d_alloc_root(inode);
 726         if (!sb->s_root)
 727                 goto out_iput;
 728
 729         return 0;
 730 out_iput:
 731         iput(inode);
 732 out:
 733         return ret;
 734 }
 735
 736 static int
 737 spufs_fill_super(struct super_block *sb, void *data, int silent)
 738 {
 739         static struct super_operations s_ops = {
 740                 .alloc_inode = spufs_alloc_inode,
 741                 .destroy_inode = spufs_destroy_inode,
 742                 .statfs = simple_statfs,
 743                 .delete_inode = spufs_delete_inode,
 744                 .drop_inode = generic_delete_inode,
 745         };
 746
 747         sb->s_maxbytes = MAX_LFS_FILESIZE;
 748         sb->s_blocksize = PAGE_CACHE_SIZE;
 749         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 750         sb->s_magic = SPUFS_MAGIC;
 751         sb->s_op = &s_ops;
 752
 753         return spufs_create_root(sb, data);
 754 }
 755
 756 static int
 757 spufs_get_sb(struct file_system_type *fstype, int flags,
 758                 const char *name, void *data, struct vfsmount *mnt)
 759 {
 760         return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
 761 }
 762
 763 static struct file_system_type spufs_type = {
 764         .owner = THIS_MODULE,
 765         .name = "spufs",
 766         .get_sb = spufs_get_sb,
 767         .kill_sb = kill_litter_super,
 768 };
 769
 770 static int __init spufs_init(void)
 771 {
 772         int ret;
 773
 774         ret = -ENODEV;
 775         if (!spu_management_ops)
 776                 goto out;
 777
 778         ret = -ENOMEM;
 779         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 780                         sizeof(struct spufs_inode_info), 0,
 781                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 782
 783         if (!spufs_inode_cache)
 784                 goto out;
 785         ret = spu_sched_init();
 786         if (ret)
 787                 goto out_cache;
 788         ret = register_filesystem(&spufs_type);
 789         if (ret)
 790                 goto out_sched;
 791         ret = register_spu_syscalls(&spufs_calls);
 792         if (ret)
 793                 goto out_fs;
 794
 795         spufs_init_isolated_loader();
 796
 797         return 0;
 798
 799 out_fs:
 800         unregister_filesystem(&spufs_type);
 801 out_sched:
 802         spu_sched_exit();
 803 out_cache:
 804         kmem_cache_destroy(spufs_inode_cache);
 805 out:
 806         return ret;
 807 }
 808 module_init(spufs_init);
 809
 810 static void __exit spufs_exit(void)
 811 {
 812         spu_sched_exit();
 813         spufs_exit_isolated_loader();
 814         unregister_spu_syscalls(&spufs_calls);
 815         unregister_filesystem(&spufs_type);
 816         kmem_cache_destroy(spufs_inode_cache);
 817 }
 818 module_exit(spufs_exit);
 819
 820 MODULE_LICENSE("GPL");
 821 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 822