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         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
  78 }
  79
  80 static void spufs_destroy_inode(struct inode *inode)
  81 {
  82         call_rcu(&inode->i_rcu, spufs_i_callback);
  83 }
  84
  85 static void
  86 spufs_init_once(void *p)
  87 {
  88         struct spufs_inode_info *ei = p;
  89
  90         inode_init_once(&ei->vfs_inode);
  91 }
  92
  93 static struct inode *
  94 spufs_new_inode(struct super_block *sb, umode_t mode)
  95 {
  96         struct inode *inode;
  97
  98         inode = new_inode(sb);
  99         if (!inode)
 100                 goto out;
 101
 102         inode->i_ino = get_next_ino();
 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, umode_t 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         clear_inode(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         int res;
 191         spufs_prune_dir(dir);
 192         d_drop(dir);
 193         res = simple_rmdir(parent, dir);
 194         /* We have to give up the mm_struct */
 195         spu_forget(SPUFS_I(dir->d_inode)->i_ctx);
 196         return res;
 197 }
 198
 199 static int spufs_fill_dir(struct dentry *dir,
 200                 const struct spufs_tree_descr *files, umode_t mode,
 201                 struct spu_context *ctx)
 202 {
 203         while (files->name && files->name[0]) {
 204                 int ret;
 205                 struct dentry *dentry = d_alloc_name(dir, files->name);
 206                 if (!dentry)
 207                         return -ENOMEM;
 208                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 209                                         files->mode & mode, files->size, ctx);
 210                 if (ret)
 211                         return ret;
 212                 files++;
 213         }
 214         return 0;
 215 }
 216
 217 static int spufs_dir_close(struct inode *inode, struct file *file)
 218 {
 219         struct spu_context *ctx;
 220         struct inode *parent;
 221         struct dentry *dir;
 222         int ret;
 223
 224         dir = file->f_path.dentry;
 225         parent = dir->d_parent->d_inode;
 226         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 227
 228         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
 229         ret = spufs_rmdir(parent, dir);
 230         mutex_unlock(&parent->i_mutex);
 231         WARN_ON(ret);
 232
 233         return dcache_dir_close(inode, file);
 234 }
 235
 236 const struct file_operations spufs_context_fops = {
 237         .open           = dcache_dir_open,
 238         .release        = spufs_dir_close,
 239         .llseek         = dcache_dir_lseek,
 240         .read           = generic_read_dir,
 241         .iterate        = dcache_readdir,
 242         .fsync          = noop_fsync,
 243 };
 244 EXPORT_SYMBOL_GPL(spufs_context_fops);
 245
 246 static int
 247 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 248                 umode_t mode)
 249 {
 250         int ret;
 251         struct inode *inode;
 252         struct spu_context *ctx;
 253
 254         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 255         if (!inode)
 256                 return -ENOSPC;
 257
 258         if (dir->i_mode & S_ISGID) {
 259                 inode->i_gid = dir->i_gid;
 260                 inode->i_mode &= S_ISGID;
 261         }
 262         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 263         SPUFS_I(inode)->i_ctx = ctx;
 264         if (!ctx) {
 265                 iput(inode);
 266                 return -ENOSPC;
 267         }
 268
 269         ctx->flags = flags;
 270         inode->i_op = &simple_dir_inode_operations;
 271         inode->i_fop = &simple_dir_operations;
 272
 273         mutex_lock(&inode->i_mutex);
 274
 275         dget(dentry);
 276         inc_nlink(dir);
 277         inc_nlink(inode);
 278
 279         d_instantiate(dentry, inode);
 280
 281         if (flags & SPU_CREATE_NOSCHED)
 282                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 283                                          mode, ctx);
 284         else
 285                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 286
 287         if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
 288                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 289                                 mode, ctx);
 290
 291         if (ret)
 292                 spufs_rmdir(dir, dentry);
 293
 294         mutex_unlock(&inode->i_mutex);
 295
 296         return ret;
 297 }
 298
 299 static int spufs_context_open(struct path *path)
 300 {
 301         int ret;
 302         struct file *filp;
 303
 304         ret = get_unused_fd();
 305         if (ret < 0)
 306                 return ret;
 307
 308         filp = dentry_open(path, O_RDONLY, current_cred());
 309         if (IS_ERR(filp)) {
 310                 put_unused_fd(ret);
 311                 return PTR_ERR(filp);
 312         }
 313
 314         filp->f_op = &spufs_context_fops;
 315         fd_install(ret, filp);
 316         return ret;
 317 }
 318
 319 static struct spu_context *
 320 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 321                                                 struct file *filp)
 322 {
 323         struct spu_context *tmp, *neighbor, *err;
 324         int count, node;
 325         int aff_supp;
 326
 327         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 328                                         struct spu, cbe_list))->aff_list);
 329
 330         if (!aff_supp)
 331                 return ERR_PTR(-EINVAL);
 332
 333         if (flags & SPU_CREATE_GANG)
 334                 return ERR_PTR(-EINVAL);
 335
 336         if (flags & SPU_CREATE_AFFINITY_MEM &&
 337             gang->aff_ref_ctx &&
 338             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 339                 return ERR_PTR(-EEXIST);
 340
 341         if (gang->aff_flags & AFF_MERGED)
 342                 return ERR_PTR(-EBUSY);
 343
 344         neighbor = NULL;
 345         if (flags & SPU_CREATE_AFFINITY_SPU) {
 346                 if (!filp || filp->f_op != &spufs_context_fops)
 347                         return ERR_PTR(-EINVAL);
 348
 349                 neighbor = get_spu_context(
 350                                 SPUFS_I(file_inode(filp))->i_ctx);
 351
 352                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 353                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 354                     !list_entry(neighbor->aff_list.next, struct spu_context,
 355                     aff_list)->aff_head) {
 356                         err = ERR_PTR(-EEXIST);
 357                         goto out_put_neighbor;
 358                 }
 359
 360                 if (gang != neighbor->gang) {
 361                         err = ERR_PTR(-EINVAL);
 362                         goto out_put_neighbor;
 363                 }
 364
 365                 count = 1;
 366                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 367                         count++;
 368                 if (list_empty(&neighbor->aff_list))
 369                         count++;
 370
 371                 for (node = 0; node < MAX_NUMNODES; node++) {
 372                         if ((cbe_spu_info[node].n_spus - atomic_read(
 373                                 &cbe_spu_info[node].reserved_spus)) >= count)
 374                                 break;
 375                 }
 376
 377                 if (node == MAX_NUMNODES) {
 378                         err = ERR_PTR(-EEXIST);
 379                         goto out_put_neighbor;
 380                 }
 381         }
 382
 383         return neighbor;
 384
 385 out_put_neighbor:
 386         put_spu_context(neighbor);
 387         return err;
 388 }
 389
 390 static void
 391 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 392                                         struct spu_context *neighbor)
 393 {
 394         if (flags & SPU_CREATE_AFFINITY_MEM)
 395                 ctx->gang->aff_ref_ctx = ctx;
 396
 397         if (flags & SPU_CREATE_AFFINITY_SPU) {
 398                 if (list_empty(&neighbor->aff_list)) {
 399                         list_add_tail(&neighbor->aff_list,
 400                                 &ctx->gang->aff_list_head);
 401                         neighbor->aff_head = 1;
 402                 }
 403
 404                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 405                     || list_entry(neighbor->aff_list.next, struct spu_context,
 406                                                         aff_list)->aff_head) {
 407                         list_add(&ctx->aff_list, &neighbor->aff_list);
 408                 } else  {
 409                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 410                         if (neighbor->aff_head) {
 411                                 neighbor->aff_head = 0;
 412                                 ctx->aff_head = 1;
 413                         }
 414                 }
 415
 416                 if (!ctx->gang->aff_ref_ctx)
 417                         ctx->gang->aff_ref_ctx = ctx;
 418         }
 419 }
 420
 421 static int
 422 spufs_create_context(struct inode *inode, struct dentry *dentry,
 423                         struct vfsmount *mnt, int flags, umode_t mode,
 424                         struct file *aff_filp)
 425 {
 426         int ret;
 427         int affinity;
 428         struct spu_gang *gang;
 429         struct spu_context *neighbor;
 430         struct path path = {.mnt = mnt, .dentry = dentry};
 431
 432         if ((flags & SPU_CREATE_NOSCHED) &&
 433             !capable(CAP_SYS_NICE))
 434                 return -EPERM;
 435
 436         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 437             == SPU_CREATE_ISOLATE)
 438                 return -EINVAL;
 439
 440         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 441                 return -ENODEV;
 442
 443         gang = NULL;
 444         neighbor = NULL;
 445         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 446         if (affinity) {
 447                 gang = SPUFS_I(inode)->i_gang;
 448                 if (!gang)
 449                         return -EINVAL;
 450                 mutex_lock(&gang->aff_mutex);
 451                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 452                 if (IS_ERR(neighbor)) {
 453                         ret = PTR_ERR(neighbor);
 454                         goto out_aff_unlock;
 455                 }
 456         }
 457
 458         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 459         if (ret)
 460                 goto out_aff_unlock;
 461
 462         if (affinity) {
 463                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 464                                                                 neighbor);
 465                 if (neighbor)
 466                         put_spu_context(neighbor);
 467         }
 468
 469         ret = spufs_context_open(&path);
 470         if (ret < 0)
 471                 WARN_ON(spufs_rmdir(inode, dentry));
 472
 473 out_aff_unlock:
 474         if (affinity)
 475                 mutex_unlock(&gang->aff_mutex);
 476         return ret;
 477 }
 478
 479 static int
 480 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
 481 {
 482         int ret;
 483         struct inode *inode;
 484         struct spu_gang *gang;
 485
 486         ret = -ENOSPC;
 487         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 488         if (!inode)
 489                 goto out;
 490
 491         ret = 0;
 492         if (dir->i_mode & S_ISGID) {
 493                 inode->i_gid = dir->i_gid;
 494                 inode->i_mode &= S_ISGID;
 495         }
 496         gang = alloc_spu_gang();
 497         SPUFS_I(inode)->i_ctx = NULL;
 498         SPUFS_I(inode)->i_gang = gang;
 499         if (!gang)
 500                 goto out_iput;
 501
 502         inode->i_op = &simple_dir_inode_operations;
 503         inode->i_fop = &simple_dir_operations;
 504
 505         d_instantiate(dentry, inode);
 506         inc_nlink(dir);
 507         inc_nlink(dentry->d_inode);
 508         return ret;
 509
 510 out_iput:
 511         iput(inode);
 512 out:
 513         return ret;
 514 }
 515
 516 static int spufs_gang_open(struct path *path)
 517 {
 518         int ret;
 519         struct file *filp;
 520
 521         ret = get_unused_fd();
 522         if (ret < 0)
 523                 return ret;
 524
 525         /*
 526          * get references for dget and mntget, will be released
 527          * in error path of *_open().
 528          */
 529         filp = dentry_open(path, O_RDONLY, current_cred());
 530         if (IS_ERR(filp)) {
 531                 put_unused_fd(ret);
 532                 return PTR_ERR(filp);
 533         }
 534
 535         filp->f_op = &simple_dir_operations;
 536         fd_install(ret, filp);
 537         return ret;
 538 }
 539
 540 static int spufs_create_gang(struct inode *inode,
 541                         struct dentry *dentry,
 542                         struct vfsmount *mnt, umode_t mode)
 543 {
 544         struct path path = {.mnt = mnt, .dentry = dentry};
 545         int ret;
 546
 547         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 548         if (!ret) {
 549                 ret = spufs_gang_open(&path);
 550                 if (ret < 0) {
 551                         int err = simple_rmdir(inode, dentry);
 552                         WARN_ON(err);
 553                 }
 554         }
 555         return ret;
 556 }
 557
 558
 559 static struct file_system_type spufs_type;
 560
 561 long spufs_create(struct path *path, struct dentry *dentry,
 562                 unsigned int flags, umode_t mode, struct file *filp)
 563 {
 564         struct inode *dir = path->dentry->d_inode;
 565         int ret;
 566
 567         /* check if we are on spufs */
 568         if (path->dentry->d_sb->s_type != &spufs_type)
 569                 return -EINVAL;
 570
 571         /* don't accept undefined flags */
 572         if (flags & (~SPU_CREATE_FLAG_ALL))
 573                 return -EINVAL;
 574
 575         /* only threads can be underneath a gang */
 576         if (path->dentry != path->dentry->d_sb->s_root)
 577                 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
 578                         return -EINVAL;
 579
 580         mode &= ~current_umask();
 581
 582         if (flags & SPU_CREATE_GANG)
 583                 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
 584         else
 585                 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
 586                                             filp);
 587         if (ret >= 0)
 588                 fsnotify_mkdir(dir, dentry);
 589
 590         return ret;
 591 }
 592
 593 /* File system initialization */
 594 enum {
 595         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 596 };
 597
 598 static const match_table_t spufs_tokens = {
 599         { Opt_uid,   "uid=%d" },
 600         { Opt_gid,   "gid=%d" },
 601         { Opt_mode,  "mode=%o" },
 602         { Opt_debug, "debug" },
 603         { Opt_err,    NULL  },
 604 };
 605
 606 static int
 607 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 608 {
 609         char *p;
 610         substring_t args[MAX_OPT_ARGS];
 611
 612         while ((p = strsep(&options, ",")) != NULL) {
 613                 int token, option;
 614
 615                 if (!*p)
 616                         continue;
 617
 618                 token = match_token(p, spufs_tokens, args);
 619                 switch (token) {
 620                 case Opt_uid:
 621                         if (match_int(&args[0], &option))
 622                                 return 0;
 623                         root->i_uid = make_kuid(current_user_ns(), option);
 624                         if (!uid_valid(root->i_uid))
 625                                 return 0;
 626                         break;
 627                 case Opt_gid:
 628                         if (match_int(&args[0], &option))
 629                                 return 0;
 630                         root->i_gid = make_kgid(current_user_ns(), option);
 631                         if (!gid_valid(root->i_gid))
 632                                 return 0;
 633                         break;
 634                 case Opt_mode:
 635                         if (match_octal(&args[0], &option))
 636                                 return 0;
 637                         root->i_mode = option | S_IFDIR;
 638                         break;
 639                 case Opt_debug:
 640                         spufs_get_sb_info(sb)->debug = 1;
 641                         break;
 642                 default:
 643                         return 0;
 644                 }
 645         }
 646         return 1;
 647 }
 648
 649 static void spufs_exit_isolated_loader(void)
 650 {
 651         free_pages((unsigned long) isolated_loader,
 652                         get_order(isolated_loader_size));
 653 }
 654
 655 static void
 656 spufs_init_isolated_loader(void)
 657 {
 658         struct device_node *dn;
 659         const char *loader;
 660         int size;
 661
 662         dn = of_find_node_by_path("/spu-isolation");
 663         if (!dn)
 664                 return;
 665
 666         loader = of_get_property(dn, "loader", &size);
 667         if (!loader)
 668                 return;
 669
 670         /* the loader must be align on a 16 byte boundary */
 671         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 672         if (!isolated_loader)
 673                 return;
 674
 675         isolated_loader_size = size;
 676         memcpy(isolated_loader, loader, size);
 677         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 678 }
 679
 680 static int
 681 spufs_create_root(struct super_block *sb, void *data)
 682 {
 683         struct inode *inode;
 684         int ret;
 685
 686         ret = -ENODEV;
 687         if (!spu_management_ops)
 688                 goto out;
 689
 690         ret = -ENOMEM;
 691         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 692         if (!inode)
 693                 goto out;
 694
 695         inode->i_op = &simple_dir_inode_operations;
 696         inode->i_fop = &simple_dir_operations;
 697         SPUFS_I(inode)->i_ctx = NULL;
 698         inc_nlink(inode);
 699
 700         ret = -EINVAL;
 701         if (!spufs_parse_options(sb, data, inode))
 702                 goto out_iput;
 703
 704         ret = -ENOMEM;
 705         sb->s_root = d_make_root(inode);
 706         if (!sb->s_root)
 707                 goto out;
 708
 709         return 0;
 710 out_iput:
 711         iput(inode);
 712 out:
 713         return ret;
 714 }
 715
 716 static int
 717 spufs_fill_super(struct super_block *sb, void *data, int silent)
 718 {
 719         struct spufs_sb_info *info;
 720         static const struct super_operations s_ops = {
 721                 .alloc_inode = spufs_alloc_inode,
 722                 .destroy_inode = spufs_destroy_inode,
 723                 .statfs = simple_statfs,
 724                 .evict_inode = spufs_evict_inode,
 725                 .show_options = generic_show_options,
 726         };
 727
 728         save_mount_options(sb, data);
 729
 730         info = kzalloc(sizeof(*info), GFP_KERNEL);
 731         if (!info)
 732                 return -ENOMEM;
 733
 734         sb->s_maxbytes = MAX_LFS_FILESIZE;
 735         sb->s_blocksize = PAGE_CACHE_SIZE;
 736         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 737         sb->s_magic = SPUFS_MAGIC;
 738         sb->s_op = &s_ops;
 739         sb->s_fs_info = info;
 740
 741         return spufs_create_root(sb, data);
 742 }
 743
 744 static struct dentry *
 745 spufs_mount(struct file_system_type *fstype, int flags,
 746                 const char *name, void *data)
 747 {
 748         return mount_single(fstype, flags, data, spufs_fill_super);
 749 }
 750
 751 static struct file_system_type spufs_type = {
 752         .owner = THIS_MODULE,
 753         .name = "spufs",
 754         .mount = spufs_mount,
 755         .kill_sb = kill_litter_super,
 756 };
 757 MODULE_ALIAS_FS("spufs");
 758
 759 static int __init spufs_init(void)
 760 {
 761         int ret;
 762
 763         ret = -ENODEV;
 764         if (!spu_management_ops)
 765                 goto out;
 766
 767         ret = -ENOMEM;
 768         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 769                         sizeof(struct spufs_inode_info), 0,
 770                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 771
 772         if (!spufs_inode_cache)
 773                 goto out;
 774         ret = spu_sched_init();
 775         if (ret)
 776                 goto out_cache;
 777         ret = register_spu_syscalls(&spufs_calls);
 778         if (ret)
 779                 goto out_sched;
 780         ret = register_filesystem(&spufs_type);
 781         if (ret)
 782                 goto out_syscalls;
 783
 784         spufs_init_isolated_loader();
 785
 786         return 0;
 787
 788 out_syscalls:
 789         unregister_spu_syscalls(&spufs_calls);
 790 out_sched:
 791         spu_sched_exit();
 792 out_cache:
 793         kmem_cache_destroy(spufs_inode_cache);
 794 out:
 795         return ret;
 796 }
 797 module_init(spufs_init);
 798
 799 static void __exit spufs_exit(void)
 800 {
 801         spu_sched_exit();
 802         spufs_exit_isolated_loader();
 803         unregister_spu_syscalls(&spufs_calls);
 804         unregister_filesystem(&spufs_type);
 805         kmem_cache_destroy(spufs_inode_cache);
 806 }
 807 module_exit(spufs_exit);
 808
 809 MODULE_LICENSE("GPL");
 810 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 811