git.oblomov.eu Git - linux-2.6/blob - 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 static struct kmem_cache *spufs_inode_cache;
  46 char *isolated_loader;
  47 static int isolated_loader_size;
  48
  49 static struct inode *
  50 spufs_alloc_inode(struct super_block *sb)
  51 {
  52         struct spufs_inode_info *ei;
  53
  54         ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
  55         if (!ei)
  56                 return NULL;
  57
  58         ei->i_gang = NULL;
  59         ei->i_ctx = NULL;
  60         ei->i_openers = 0;
  61
  62         return &ei->vfs_inode;
  63 }
  64
  65 static void
  66 spufs_destroy_inode(struct inode *inode)
  67 {
  68         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
  69 }
  70
  71 static void
  72 spufs_init_once(struct kmem_cache *cachep, void *p)
  73 {
  74         struct spufs_inode_info *ei = p;
  75
  76         inode_init_once(&ei->vfs_inode);
  77 }
  78
  79 static struct inode *
  80 spufs_new_inode(struct super_block *sb, int mode)
  81 {
  82         struct inode *inode;
  83
  84         inode = new_inode(sb);
  85         if (!inode)
  86                 goto out;
  87
  88         inode->i_mode = mode;
  89         inode->i_uid = current->fsuid;
  90         inode->i_gid = current->fsgid;
  91         inode->i_blocks = 0;
  92         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
  93 out:
  94         return inode;
  95 }
  96
  97 static int
  98 spufs_setattr(struct dentry *dentry, struct iattr *attr)
  99 {
 100         struct inode *inode = dentry->d_inode;
 101
 102         if ((attr->ia_valid & ATTR_SIZE) &&
 103             (attr->ia_size != inode->i_size))
 104                 return -EINVAL;
 105         return inode_setattr(inode, attr);
 106 }
 107
 108
 109 static int
 110 spufs_new_file(struct super_block *sb, struct dentry *dentry,
 111                 const struct file_operations *fops, int mode,
 112                 struct spu_context *ctx)
 113 {
 114         static struct inode_operations spufs_file_iops = {
 115                 .setattr = spufs_setattr,
 116         };
 117         struct inode *inode;
 118         int ret;
 119
 120         ret = -ENOSPC;
 121         inode = spufs_new_inode(sb, S_IFREG | mode);
 122         if (!inode)
 123                 goto out;
 124
 125         ret = 0;
 126         inode->i_op = &spufs_file_iops;
 127         inode->i_fop = fops;
 128         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 129         d_add(dentry, inode);
 130 out:
 131         return ret;
 132 }
 133
 134 static void
 135 spufs_delete_inode(struct inode *inode)
 136 {
 137         struct spufs_inode_info *ei = SPUFS_I(inode);
 138
 139         if (ei->i_ctx)
 140                 put_spu_context(ei->i_ctx);
 141         if (ei->i_gang)
 142                 put_spu_gang(ei->i_gang);
 143         clear_inode(inode);
 144 }
 145
 146 static void spufs_prune_dir(struct dentry *dir)
 147 {
 148         struct dentry *dentry, *tmp;
 149
 150         mutex_lock(&dir->d_inode->i_mutex);
 151         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 152                 spin_lock(&dcache_lock);
 153                 spin_lock(&dentry->d_lock);
 154                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
 155                         dget_locked(dentry);
 156                         __d_drop(dentry);
 157                         spin_unlock(&dentry->d_lock);
 158                         simple_unlink(dir->d_inode, dentry);
 159                         spin_unlock(&dcache_lock);
 160                         dput(dentry);
 161                 } else {
 162                         spin_unlock(&dentry->d_lock);
 163                         spin_unlock(&dcache_lock);
 164                 }
 165         }
 166         shrink_dcache_parent(dir);
 167         mutex_unlock(&dir->d_inode->i_mutex);
 168 }
 169
 170 /* Caller must hold parent->i_mutex */
 171 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 172 {
 173         /* remove all entries */
 174         spufs_prune_dir(dir);
 175         d_drop(dir);
 176
 177         return simple_rmdir(parent, dir);
 178 }
 179
 180 static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
 181                           int mode, struct spu_context *ctx)
 182 {
 183         struct dentry *dentry, *tmp;
 184         int ret;
 185
 186         while (files->name && files->name[0]) {
 187                 ret = -ENOMEM;
 188                 dentry = d_alloc_name(dir, files->name);
 189                 if (!dentry)
 190                         goto out;
 191                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 192                                         files->mode & mode, ctx);
 193                 if (ret)
 194                         goto out;
 195                 files++;
 196         }
 197         return 0;
 198 out:
 199         /*
 200          * remove all children from dir. dir->inode is not set so don't
 201          * just simply use spufs_prune_dir() and panic afterwards :)
 202          * dput() looks like it will do the right thing:
 203          * - dec parent's ref counter
 204          * - remove child from parent's child list
 205          * - free child's inode if possible
 206          * - free child
 207          */
 208         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 209                 dput(dentry);
 210         }
 211
 212         shrink_dcache_parent(dir);
 213         return ret;
 214 }
 215
 216 static int spufs_dir_close(struct inode *inode, struct file *file)
 217 {
 218         struct spu_context *ctx;
 219         struct inode *parent;
 220         struct dentry *dir;
 221         int ret;
 222
 223         dir = file->f_path.dentry;
 224         parent = dir->d_parent->d_inode;
 225         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 226
 227         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
 228         ret = spufs_rmdir(parent, dir);
 229         mutex_unlock(&parent->i_mutex);
 230         WARN_ON(ret);
 231
 232         /* We have to give up the mm_struct */
 233         spu_forget(ctx);
 234
 235         return dcache_dir_close(inode, file);
 236 }
 237
 238 const struct file_operations spufs_context_fops = {
 239         .open           = dcache_dir_open,
 240         .release        = spufs_dir_close,
 241         .llseek         = dcache_dir_lseek,
 242         .read           = generic_read_dir,
 243         .readdir        = dcache_readdir,
 244         .fsync          = simple_sync_file,
 245 };
 246 EXPORT_SYMBOL_GPL(spufs_context_fops);
 247
 248 static int
 249 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 250                 int mode)
 251 {
 252         int ret;
 253         struct inode *inode;
 254         struct spu_context *ctx;
 255
 256         ret = -ENOSPC;
 257         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 258         if (!inode)
 259                 goto out;
 260
 261         if (dir->i_mode & S_ISGID) {
 262                 inode->i_gid = dir->i_gid;
 263                 inode->i_mode &= S_ISGID;
 264         }
 265         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 266         SPUFS_I(inode)->i_ctx = ctx;
 267         if (!ctx)
 268                 goto out_iput;
 269
 270         ctx->flags = flags;
 271         inode->i_op = &simple_dir_inode_operations;
 272         inode->i_fop = &simple_dir_operations;
 273         if (flags & SPU_CREATE_NOSCHED)
 274                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 275                                          mode, ctx);
 276         else
 277                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 278
 279         if (ret)
 280                 goto out_free_ctx;
 281
 282         d_instantiate(dentry, inode);
 283         dget(dentry);
 284         dir->i_nlink++;
 285         dentry->d_inode->i_nlink++;
 286         goto out;
 287
 288 out_free_ctx:
 289         spu_forget(ctx);
 290         put_spu_context(ctx);
 291 out_iput:
 292         iput(inode);
 293 out:
 294         return ret;
 295 }
 296
 297 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 298 {
 299         int ret;
 300         struct file *filp;
 301
 302         ret = get_unused_fd();
 303         if (ret < 0) {
 304                 dput(dentry);
 305                 mntput(mnt);
 306                 goto out;
 307         }
 308
 309         filp = dentry_open(dentry, mnt, O_RDONLY);
 310         if (IS_ERR(filp)) {
 311                 put_unused_fd(ret);
 312                 ret = PTR_ERR(filp);
 313                 goto out;
 314         }
 315
 316         filp->f_op = &spufs_context_fops;
 317         fd_install(ret, filp);
 318 out:
 319         return ret;
 320 }
 321
 322 static struct spu_context *
 323 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 324                                                 struct file *filp)
 325 {
 326         struct spu_context *tmp, *neighbor, *err;
 327         int count, node;
 328         int aff_supp;
 329
 330         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 331                                         struct spu, cbe_list))->aff_list);
 332
 333         if (!aff_supp)
 334                 return ERR_PTR(-EINVAL);
 335
 336         if (flags & SPU_CREATE_GANG)
 337                 return ERR_PTR(-EINVAL);
 338
 339         if (flags & SPU_CREATE_AFFINITY_MEM &&
 340             gang->aff_ref_ctx &&
 341             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 342                 return ERR_PTR(-EEXIST);
 343
 344         if (gang->aff_flags & AFF_MERGED)
 345                 return ERR_PTR(-EBUSY);
 346
 347         neighbor = NULL;
 348         if (flags & SPU_CREATE_AFFINITY_SPU) {
 349                 if (!filp || filp->f_op != &spufs_context_fops)
 350                         return ERR_PTR(-EINVAL);
 351
 352                 neighbor = get_spu_context(
 353                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
 354
 355                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 356                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 357                     !list_entry(neighbor->aff_list.next, struct spu_context,
 358                     aff_list)->aff_head) {
 359                         err = ERR_PTR(-EEXIST);
 360                         goto out_put_neighbor;
 361                 }
 362
 363                 if (gang != neighbor->gang) {
 364                         err = ERR_PTR(-EINVAL);
 365                         goto out_put_neighbor;
 366                 }
 367
 368                 count = 1;
 369                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 370                         count++;
 371                 if (list_empty(&neighbor->aff_list))
 372                         count++;
 373
 374                 for (node = 0; node < MAX_NUMNODES; node++) {
 375                         if ((cbe_spu_info[node].n_spus - atomic_read(
 376                                 &cbe_spu_info[node].reserved_spus)) >= count)
 377                                 break;
 378                 }
 379
 380                 if (node == MAX_NUMNODES) {
 381                         err = ERR_PTR(-EEXIST);
 382                         goto out_put_neighbor;
 383                 }
 384         }
 385
 386         return neighbor;
 387
 388 out_put_neighbor:
 389         put_spu_context(neighbor);
 390         return err;
 391 }
 392
 393 static void
 394 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 395                                         struct spu_context *neighbor)
 396 {
 397         if (flags & SPU_CREATE_AFFINITY_MEM)
 398                 ctx->gang->aff_ref_ctx = ctx;
 399
 400         if (flags & SPU_CREATE_AFFINITY_SPU) {
 401                 if (list_empty(&neighbor->aff_list)) {
 402                         list_add_tail(&neighbor->aff_list,
 403                                 &ctx->gang->aff_list_head);
 404                         neighbor->aff_head = 1;
 405                 }
 406
 407                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 408                     || list_entry(neighbor->aff_list.next, struct spu_context,
 409                                                         aff_list)->aff_head) {
 410                         list_add(&ctx->aff_list, &neighbor->aff_list);
 411                 } else  {
 412                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 413                         if (neighbor->aff_head) {
 414                                 neighbor->aff_head = 0;
 415                                 ctx->aff_head = 1;
 416                         }
 417                 }
 418
 419                 if (!ctx->gang->aff_ref_ctx)
 420                         ctx->gang->aff_ref_ctx = ctx;
 421         }
 422 }
 423
 424 static int
 425 spufs_create_context(struct inode *inode, struct dentry *dentry,
 426                         struct vfsmount *mnt, int flags, int mode,
 427                         struct file *aff_filp)
 428 {
 429         int ret;
 430         int affinity;
 431         struct spu_gang *gang;
 432         struct spu_context *neighbor;
 433
 434         ret = -EPERM;
 435         if ((flags & SPU_CREATE_NOSCHED) &&
 436             !capable(CAP_SYS_NICE))
 437                 goto out_unlock;
 438
 439         ret = -EINVAL;
 440         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 441             == SPU_CREATE_ISOLATE)
 442                 goto out_unlock;
 443
 444         ret = -ENODEV;
 445         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 446                 goto out_unlock;
 447
 448         gang = NULL;
 449         neighbor = NULL;
 450         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 451         if (affinity) {
 452                 gang = SPUFS_I(inode)->i_gang;
 453                 ret = -EINVAL;
 454                 if (!gang)
 455                         goto out_unlock;
 456                 mutex_lock(&gang->aff_mutex);
 457                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 458                 if (IS_ERR(neighbor)) {
 459                         ret = PTR_ERR(neighbor);
 460                         goto out_aff_unlock;
 461                 }
 462         }
 463
 464         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 465         if (ret)
 466                 goto out_aff_unlock;
 467
 468         if (affinity) {
 469                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 470                                                                 neighbor);
 471                 if (neighbor)
 472                         put_spu_context(neighbor);
 473         }
 474
 475         /*
 476          * get references for dget and mntget, will be released
 477          * in error path of *_open().
 478          */
 479         ret = spufs_context_open(dget(dentry), mntget(mnt));
 480         if (ret < 0) {
 481                 WARN_ON(spufs_rmdir(inode, dentry));
 482                 mutex_unlock(&inode->i_mutex);
 483                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 484                 goto out;
 485         }
 486
 487 out_aff_unlock:
 488         if (affinity)
 489                 mutex_unlock(&gang->aff_mutex);
 490 out_unlock:
 491         mutex_unlock(&inode->i_mutex);
 492 out:
 493         dput(dentry);
 494         return ret;
 495 }
 496
 497 static int
 498 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
 499 {
 500         int ret;
 501         struct inode *inode;
 502         struct spu_gang *gang;
 503
 504         ret = -ENOSPC;
 505         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 506         if (!inode)
 507                 goto out;
 508
 509         ret = 0;
 510         if (dir->i_mode & S_ISGID) {
 511                 inode->i_gid = dir->i_gid;
 512                 inode->i_mode &= S_ISGID;
 513         }
 514         gang = alloc_spu_gang();
 515         SPUFS_I(inode)->i_ctx = NULL;
 516         SPUFS_I(inode)->i_gang = gang;
 517         if (!gang)
 518                 goto out_iput;
 519
 520         inode->i_op = &simple_dir_inode_operations;
 521         inode->i_fop = &simple_dir_operations;
 522
 523         d_instantiate(dentry, inode);
 524         dir->i_nlink++;
 525         dentry->d_inode->i_nlink++;
 526         return ret;
 527
 528 out_iput:
 529         iput(inode);
 530 out:
 531         return ret;
 532 }
 533
 534 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 535 {
 536         int ret;
 537         struct file *filp;
 538
 539         ret = get_unused_fd();
 540         if (ret < 0) {
 541                 dput(dentry);
 542                 mntput(mnt);
 543                 goto out;
 544         }
 545
 546         filp = dentry_open(dentry, mnt, O_RDONLY);
 547         if (IS_ERR(filp)) {
 548                 put_unused_fd(ret);
 549                 ret = PTR_ERR(filp);
 550                 goto out;
 551         }
 552
 553         filp->f_op = &simple_dir_operations;
 554         fd_install(ret, filp);
 555 out:
 556         return ret;
 557 }
 558
 559 static int spufs_create_gang(struct inode *inode,
 560                         struct dentry *dentry,
 561                         struct vfsmount *mnt, int mode)
 562 {
 563         int ret;
 564
 565         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 566         if (ret)
 567                 goto out;
 568
 569         /*
 570          * get references for dget and mntget, will be released
 571          * in error path of *_open().
 572          */
 573         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 574         if (ret < 0) {
 575                 int err = simple_rmdir(inode, dentry);
 576                 WARN_ON(err);
 577         }
 578
 579 out:
 580         mutex_unlock(&inode->i_mutex);
 581         dput(dentry);
 582         return ret;
 583 }
 584
 585
 586 static struct file_system_type spufs_type;
 587
 588 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
 589                                                         struct file *filp)
 590 {
 591         struct dentry *dentry;
 592         int ret;
 593
 594         ret = -EINVAL;
 595         /* check if we are on spufs */
 596         if (nd->path.dentry->d_sb->s_type != &spufs_type)
 597                 goto out;
 598
 599         /* don't accept undefined flags */
 600         if (flags & (~SPU_CREATE_FLAG_ALL))
 601                 goto out;
 602
 603         /* only threads can be underneath a gang */
 604         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
 605                 if ((flags & SPU_CREATE_GANG) ||
 606                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
 607                         goto out;
 608         }
 609
 610         dentry = lookup_create(nd, 1);
 611         ret = PTR_ERR(dentry);
 612         if (IS_ERR(dentry))
 613                 goto out_dir;
 614
 615         ret = -EEXIST;
 616         if (dentry->d_inode)
 617                 goto out_dput;
 618
 619         mode &= ~current->fs->umask;
 620
 621         if (flags & SPU_CREATE_GANG)
 622                 ret = spufs_create_gang(nd->path.dentry->d_inode,
 623                                          dentry, nd->path.mnt, mode);
 624         else
 625                 ret = spufs_create_context(nd->path.dentry->d_inode,
 626                                             dentry, nd->path.mnt, flags, mode,
 627                                             filp);
 628         if (ret >= 0)
 629                 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
 630         return ret;
 631
 632 out_dput:
 633         dput(dentry);
 634 out_dir:
 635         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
 636 out:
 637         return ret;
 638 }
 639
 640 /* File system initialization */
 641 enum {
 642         Opt_uid, Opt_gid, Opt_mode, Opt_err,
 643 };
 644
 645 static match_table_t spufs_tokens = {
 646         { Opt_uid,  "uid=%d" },
 647         { Opt_gid,  "gid=%d" },
 648         { Opt_mode, "mode=%o" },
 649         { Opt_err,   NULL  },
 650 };
 651
 652 static int
 653 spufs_parse_options(char *options, struct inode *root)
 654 {
 655         char *p;
 656         substring_t args[MAX_OPT_ARGS];
 657
 658         while ((p = strsep(&options, ",")) != NULL) {
 659                 int token, option;
 660
 661                 if (!*p)
 662                         continue;
 663
 664                 token = match_token(p, spufs_tokens, args);
 665                 switch (token) {
 666                 case Opt_uid:
 667                         if (match_int(&args[0], &option))
 668                                 return 0;
 669                         root->i_uid = option;
 670                         break;
 671                 case Opt_gid:
 672                         if (match_int(&args[0], &option))
 673                                 return 0;
 674                         root->i_gid = option;
 675                         break;
 676                 case Opt_mode:
 677                         if (match_octal(&args[0], &option))
 678                                 return 0;
 679                         root->i_mode = option | S_IFDIR;
 680                         break;
 681                 default:
 682                         return 0;
 683                 }
 684         }
 685         return 1;
 686 }
 687
 688 static void spufs_exit_isolated_loader(void)
 689 {
 690         free_pages((unsigned long) isolated_loader,
 691                         get_order(isolated_loader_size));
 692 }
 693
 694 static void
 695 spufs_init_isolated_loader(void)
 696 {
 697         struct device_node *dn;
 698         const char *loader;
 699         int size;
 700
 701         dn = of_find_node_by_path("/spu-isolation");
 702         if (!dn)
 703                 return;
 704
 705         loader = of_get_property(dn, "loader", &size);
 706         if (!loader)
 707                 return;
 708
 709         /* the loader must be align on a 16 byte boundary */
 710         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 711         if (!isolated_loader)
 712                 return;
 713
 714         isolated_loader_size = size;
 715         memcpy(isolated_loader, loader, size);
 716         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 717 }
 718
 719 static int
 720 spufs_create_root(struct super_block *sb, void *data)
 721 {
 722         struct inode *inode;
 723         int ret;
 724
 725         ret = -ENODEV;
 726         if (!spu_management_ops)
 727                 goto out;
 728
 729         ret = -ENOMEM;
 730         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 731         if (!inode)
 732                 goto out;
 733
 734         inode->i_op = &simple_dir_inode_operations;
 735         inode->i_fop = &simple_dir_operations;
 736         SPUFS_I(inode)->i_ctx = NULL;
 737
 738         ret = -EINVAL;
 739         if (!spufs_parse_options(data, inode))
 740                 goto out_iput;
 741
 742         ret = -ENOMEM;
 743         sb->s_root = d_alloc_root(inode);
 744         if (!sb->s_root)
 745                 goto out_iput;
 746
 747         return 0;
 748 out_iput:
 749         iput(inode);
 750 out:
 751         return ret;
 752 }
 753
 754 static int
 755 spufs_fill_super(struct super_block *sb, void *data, int silent)
 756 {
 757         static struct super_operations s_ops = {
 758                 .alloc_inode = spufs_alloc_inode,
 759                 .destroy_inode = spufs_destroy_inode,
 760                 .statfs = simple_statfs,
 761                 .delete_inode = spufs_delete_inode,
 762                 .drop_inode = generic_delete_inode,
 763                 .show_options = generic_show_options,
 764         };
 765
 766         save_mount_options(sb, data);
 767
 768         sb->s_maxbytes = MAX_LFS_FILESIZE;
 769         sb->s_blocksize = PAGE_CACHE_SIZE;
 770         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 771         sb->s_magic = SPUFS_MAGIC;
 772         sb->s_op = &s_ops;
 773
 774         return spufs_create_root(sb, data);
 775 }
 776
 777 static int
 778 spufs_get_sb(struct file_system_type *fstype, int flags,
 779                 const char *name, void *data, struct vfsmount *mnt)
 780 {
 781         return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
 782 }
 783
 784 static struct file_system_type spufs_type = {
 785         .owner = THIS_MODULE,
 786         .name = "spufs",
 787         .get_sb = spufs_get_sb,
 788         .kill_sb = kill_litter_super,
 789 };
 790
 791 static int __init spufs_init(void)
 792 {
 793         int ret;
 794
 795         ret = -ENODEV;
 796         if (!spu_management_ops)
 797                 goto out;
 798
 799         ret = -ENOMEM;
 800         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 801                         sizeof(struct spufs_inode_info), 0,
 802                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 803
 804         if (!spufs_inode_cache)
 805                 goto out;
 806         ret = spu_sched_init();
 807         if (ret)
 808                 goto out_cache;
 809         ret = register_filesystem(&spufs_type);
 810         if (ret)
 811                 goto out_sched;
 812         ret = register_spu_syscalls(&spufs_calls);
 813         if (ret)
 814                 goto out_fs;
 815
 816         spufs_init_isolated_loader();
 817
 818         return 0;
 819
 820 out_fs:
 821         unregister_filesystem(&spufs_type);
 822 out_sched:
 823         spu_sched_exit();
 824 out_cache:
 825         kmem_cache_destroy(spufs_inode_cache);
 826 out:
 827         return ret;
 828 }
 829 module_init(spufs_init);
 830
 831 static void __exit spufs_exit(void)
 832 {
 833         spu_sched_exit();
 834         spufs_exit_isolated_loader();
 835         unregister_spu_syscalls(&spufs_calls);
 836         unregister_filesystem(&spufs_type);
 837         kmem_cache_destroy(spufs_inode_cache);
 838 }
 839 module_exit(spufs_exit);
 840
 841 MODULE_LICENSE("GPL");
 842 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 843