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 <linux/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_free_inode(struct inode *inode)
  75 {
  76         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
  77 }
  78
  79 static void
  80 spufs_init_once(void *p)
  81 {
  82         struct spufs_inode_info *ei = p;
  83
  84         inode_init_once(&ei->vfs_inode);
  85 }
  86
  87 static struct inode *
  88 spufs_new_inode(struct super_block *sb, umode_t mode)
  89 {
  90         struct inode *inode;
  91
  92         inode = new_inode(sb);
  93         if (!inode)
  94                 goto out;
  95
  96         inode->i_ino = get_next_ino();
  97         inode->i_mode = mode;
  98         inode->i_uid = current_fsuid();
  99         inode->i_gid = current_fsgid();
 100         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
 101 out:
 102         return inode;
 103 }
 104
 105 static int
 106 spufs_setattr(struct dentry *dentry, struct iattr *attr)
 107 {
 108         struct inode *inode = d_inode(dentry);
 109
 110         if ((attr->ia_valid & ATTR_SIZE) &&
 111             (attr->ia_size != inode->i_size))
 112                 return -EINVAL;
 113         setattr_copy(inode, attr);
 114         mark_inode_dirty(inode);
 115         return 0;
 116 }
 117
 118
 119 static int
 120 spufs_new_file(struct super_block *sb, struct dentry *dentry,
 121                 const struct file_operations *fops, umode_t mode,
 122                 size_t size, struct spu_context *ctx)
 123 {
 124         static const struct inode_operations spufs_file_iops = {
 125                 .setattr = spufs_setattr,
 126         };
 127         struct inode *inode;
 128         int ret;
 129
 130         ret = -ENOSPC;
 131         inode = spufs_new_inode(sb, S_IFREG | mode);
 132         if (!inode)
 133                 goto out;
 134
 135         ret = 0;
 136         inode->i_op = &spufs_file_iops;
 137         inode->i_fop = fops;
 138         inode->i_size = size;
 139         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 140         d_add(dentry, inode);
 141 out:
 142         return ret;
 143 }
 144
 145 static void
 146 spufs_evict_inode(struct inode *inode)
 147 {
 148         struct spufs_inode_info *ei = SPUFS_I(inode);
 149         clear_inode(inode);
 150         if (ei->i_ctx)
 151                 put_spu_context(ei->i_ctx);
 152         if (ei->i_gang)
 153                 put_spu_gang(ei->i_gang);
 154 }
 155
 156 static void spufs_prune_dir(struct dentry *dir)
 157 {
 158         struct dentry *dentry, *tmp;
 159
 160         inode_lock(d_inode(dir));
 161         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
 162                 spin_lock(&dentry->d_lock);
 163                 if (simple_positive(dentry)) {
 164                         dget_dlock(dentry);
 165                         __d_drop(dentry);
 166                         spin_unlock(&dentry->d_lock);
 167                         simple_unlink(d_inode(dir), dentry);
 168                         /* XXX: what was dcache_lock protecting here? Other
 169                          * filesystems (IB, configfs) release dcache_lock
 170                          * before unlink */
 171                         dput(dentry);
 172                 } else {
 173                         spin_unlock(&dentry->d_lock);
 174                 }
 175         }
 176         shrink_dcache_parent(dir);
 177         inode_unlock(d_inode(dir));
 178 }
 179
 180 /* Caller must hold parent->i_mutex */
 181 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 182 {
 183         /* remove all entries */
 184         int res;
 185         spufs_prune_dir(dir);
 186         d_drop(dir);
 187         res = simple_rmdir(parent, dir);
 188         /* We have to give up the mm_struct */
 189         spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
 190         return res;
 191 }
 192
 193 static int spufs_fill_dir(struct dentry *dir,
 194                 const struct spufs_tree_descr *files, umode_t mode,
 195                 struct spu_context *ctx)
 196 {
 197         while (files->name && files->name[0]) {
 198                 int ret;
 199                 struct dentry *dentry = d_alloc_name(dir, files->name);
 200                 if (!dentry)
 201                         return -ENOMEM;
 202                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 203                                         files->mode & mode, files->size, ctx);
 204                 if (ret)
 205                         return ret;
 206                 files++;
 207         }
 208         return 0;
 209 }
 210
 211 static int spufs_dir_close(struct inode *inode, struct file *file)
 212 {
 213         struct spu_context *ctx;
 214         struct inode *parent;
 215         struct dentry *dir;
 216         int ret;
 217
 218         dir = file->f_path.dentry;
 219         parent = d_inode(dir->d_parent);
 220         ctx = SPUFS_I(d_inode(dir))->i_ctx;
 221
 222         inode_lock_nested(parent, I_MUTEX_PARENT);
 223         ret = spufs_rmdir(parent, dir);
 224         inode_unlock(parent);
 225         WARN_ON(ret);
 226
 227         return dcache_dir_close(inode, file);
 228 }
 229
 230 const struct file_operations spufs_context_fops = {
 231         .open           = dcache_dir_open,
 232         .release        = spufs_dir_close,
 233         .llseek         = dcache_dir_lseek,
 234         .read           = generic_read_dir,
 235         .iterate_shared = dcache_readdir,
 236         .fsync          = noop_fsync,
 237 };
 238 EXPORT_SYMBOL_GPL(spufs_context_fops);
 239
 240 static int
 241 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 242                 umode_t mode)
 243 {
 244         int ret;
 245         struct inode *inode;
 246         struct spu_context *ctx;
 247
 248         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 249         if (!inode)
 250                 return -ENOSPC;
 251
 252         if (dir->i_mode & S_ISGID) {
 253                 inode->i_gid = dir->i_gid;
 254                 inode->i_mode &= S_ISGID;
 255         }
 256         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 257         SPUFS_I(inode)->i_ctx = ctx;
 258         if (!ctx) {
 259                 iput(inode);
 260                 return -ENOSPC;
 261         }
 262
 263         ctx->flags = flags;
 264         inode->i_op = &simple_dir_inode_operations;
 265         inode->i_fop = &simple_dir_operations;
 266
 267         inode_lock(inode);
 268
 269         dget(dentry);
 270         inc_nlink(dir);
 271         inc_nlink(inode);
 272
 273         d_instantiate(dentry, inode);
 274
 275         if (flags & SPU_CREATE_NOSCHED)
 276                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 277                                          mode, ctx);
 278         else
 279                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 280
 281         if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
 282                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 283                                 mode, ctx);
 284
 285         if (ret)
 286                 spufs_rmdir(dir, dentry);
 287
 288         inode_unlock(inode);
 289
 290         return ret;
 291 }
 292
 293 static int spufs_context_open(struct path *path)
 294 {
 295         int ret;
 296         struct file *filp;
 297
 298         ret = get_unused_fd_flags(0);
 299         if (ret < 0)
 300                 return ret;
 301
 302         filp = dentry_open(path, O_RDONLY, current_cred());
 303         if (IS_ERR(filp)) {
 304                 put_unused_fd(ret);
 305                 return PTR_ERR(filp);
 306         }
 307
 308         filp->f_op = &spufs_context_fops;
 309         fd_install(ret, filp);
 310         return ret;
 311 }
 312
 313 static struct spu_context *
 314 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 315                                                 struct file *filp)
 316 {
 317         struct spu_context *tmp, *neighbor, *err;
 318         int count, node;
 319         int aff_supp;
 320
 321         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 322                                         struct spu, cbe_list))->aff_list);
 323
 324         if (!aff_supp)
 325                 return ERR_PTR(-EINVAL);
 326
 327         if (flags & SPU_CREATE_GANG)
 328                 return ERR_PTR(-EINVAL);
 329
 330         if (flags & SPU_CREATE_AFFINITY_MEM &&
 331             gang->aff_ref_ctx &&
 332             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 333                 return ERR_PTR(-EEXIST);
 334
 335         if (gang->aff_flags & AFF_MERGED)
 336                 return ERR_PTR(-EBUSY);
 337
 338         neighbor = NULL;
 339         if (flags & SPU_CREATE_AFFINITY_SPU) {
 340                 if (!filp || filp->f_op != &spufs_context_fops)
 341                         return ERR_PTR(-EINVAL);
 342
 343                 neighbor = get_spu_context(
 344                                 SPUFS_I(file_inode(filp))->i_ctx);
 345
 346                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 347                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 348                     !list_entry(neighbor->aff_list.next, struct spu_context,
 349                     aff_list)->aff_head) {
 350                         err = ERR_PTR(-EEXIST);
 351                         goto out_put_neighbor;
 352                 }
 353
 354                 if (gang != neighbor->gang) {
 355                         err = ERR_PTR(-EINVAL);
 356                         goto out_put_neighbor;
 357                 }
 358
 359                 count = 1;
 360                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 361                         count++;
 362                 if (list_empty(&neighbor->aff_list))
 363                         count++;
 364
 365                 for (node = 0; node < MAX_NUMNODES; node++) {
 366                         if ((cbe_spu_info[node].n_spus - atomic_read(
 367                                 &cbe_spu_info[node].reserved_spus)) >= count)
 368                                 break;
 369                 }
 370
 371                 if (node == MAX_NUMNODES) {
 372                         err = ERR_PTR(-EEXIST);
 373                         goto out_put_neighbor;
 374                 }
 375         }
 376
 377         return neighbor;
 378
 379 out_put_neighbor:
 380         put_spu_context(neighbor);
 381         return err;
 382 }
 383
 384 static void
 385 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 386                                         struct spu_context *neighbor)
 387 {
 388         if (flags & SPU_CREATE_AFFINITY_MEM)
 389                 ctx->gang->aff_ref_ctx = ctx;
 390
 391         if (flags & SPU_CREATE_AFFINITY_SPU) {
 392                 if (list_empty(&neighbor->aff_list)) {
 393                         list_add_tail(&neighbor->aff_list,
 394                                 &ctx->gang->aff_list_head);
 395                         neighbor->aff_head = 1;
 396                 }
 397
 398                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 399                     || list_entry(neighbor->aff_list.next, struct spu_context,
 400                                                         aff_list)->aff_head) {
 401                         list_add(&ctx->aff_list, &neighbor->aff_list);
 402                 } else  {
 403                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 404                         if (neighbor->aff_head) {
 405                                 neighbor->aff_head = 0;
 406                                 ctx->aff_head = 1;
 407                         }
 408                 }
 409
 410                 if (!ctx->gang->aff_ref_ctx)
 411                         ctx->gang->aff_ref_ctx = ctx;
 412         }
 413 }
 414
 415 static int
 416 spufs_create_context(struct inode *inode, struct dentry *dentry,
 417                         struct vfsmount *mnt, int flags, umode_t mode,
 418                         struct file *aff_filp)
 419 {
 420         int ret;
 421         int affinity;
 422         struct spu_gang *gang;
 423         struct spu_context *neighbor;
 424         struct path path = {.mnt = mnt, .dentry = dentry};
 425
 426         if ((flags & SPU_CREATE_NOSCHED) &&
 427             !capable(CAP_SYS_NICE))
 428                 return -EPERM;
 429
 430         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 431             == SPU_CREATE_ISOLATE)
 432                 return -EINVAL;
 433
 434         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 435                 return -ENODEV;
 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                 if (!gang)
 443                         return -EINVAL;
 444                 mutex_lock(&gang->aff_mutex);
 445                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 446                 if (IS_ERR(neighbor)) {
 447                         ret = PTR_ERR(neighbor);
 448                         goto out_aff_unlock;
 449                 }
 450         }
 451
 452         ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
 453         if (ret)
 454                 goto out_aff_unlock;
 455
 456         if (affinity) {
 457                 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
 458                                                                 neighbor);
 459                 if (neighbor)
 460                         put_spu_context(neighbor);
 461         }
 462
 463         ret = spufs_context_open(&path);
 464         if (ret < 0)
 465                 WARN_ON(spufs_rmdir(inode, dentry));
 466
 467 out_aff_unlock:
 468         if (affinity)
 469                 mutex_unlock(&gang->aff_mutex);
 470         return ret;
 471 }
 472
 473 static int
 474 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
 475 {
 476         int ret;
 477         struct inode *inode;
 478         struct spu_gang *gang;
 479
 480         ret = -ENOSPC;
 481         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 482         if (!inode)
 483                 goto out;
 484
 485         ret = 0;
 486         if (dir->i_mode & S_ISGID) {
 487                 inode->i_gid = dir->i_gid;
 488                 inode->i_mode &= S_ISGID;
 489         }
 490         gang = alloc_spu_gang();
 491         SPUFS_I(inode)->i_ctx = NULL;
 492         SPUFS_I(inode)->i_gang = gang;
 493         if (!gang) {
 494                 ret = -ENOMEM;
 495                 goto out_iput;
 496         }
 497
 498         inode->i_op = &simple_dir_inode_operations;
 499         inode->i_fop = &simple_dir_operations;
 500
 501         d_instantiate(dentry, inode);
 502         inc_nlink(dir);
 503         inc_nlink(d_inode(dentry));
 504         return ret;
 505
 506 out_iput:
 507         iput(inode);
 508 out:
 509         return ret;
 510 }
 511
 512 static int spufs_gang_open(struct path *path)
 513 {
 514         int ret;
 515         struct file *filp;
 516
 517         ret = get_unused_fd_flags(0);
 518         if (ret < 0)
 519                 return ret;
 520
 521         /*
 522          * get references for dget and mntget, will be released
 523          * in error path of *_open().
 524          */
 525         filp = dentry_open(path, O_RDONLY, current_cred());
 526         if (IS_ERR(filp)) {
 527                 put_unused_fd(ret);
 528                 return PTR_ERR(filp);
 529         }
 530
 531         filp->f_op = &simple_dir_operations;
 532         fd_install(ret, filp);
 533         return ret;
 534 }
 535
 536 static int spufs_create_gang(struct inode *inode,
 537                         struct dentry *dentry,
 538                         struct vfsmount *mnt, umode_t mode)
 539 {
 540         struct path path = {.mnt = mnt, .dentry = dentry};
 541         int ret;
 542
 543         ret = spufs_mkgang(inode, dentry, mode & 0777);
 544         if (!ret) {
 545                 ret = spufs_gang_open(&path);
 546                 if (ret < 0) {
 547                         int err = simple_rmdir(inode, dentry);
 548                         WARN_ON(err);
 549                 }
 550         }
 551         return ret;
 552 }
 553
 554
 555 static struct file_system_type spufs_type;
 556
 557 long spufs_create(struct path *path, struct dentry *dentry,
 558                 unsigned int flags, umode_t mode, struct file *filp)
 559 {
 560         struct inode *dir = d_inode(path->dentry);
 561         int ret;
 562
 563         /* check if we are on spufs */
 564         if (path->dentry->d_sb->s_type != &spufs_type)
 565                 return -EINVAL;
 566
 567         /* don't accept undefined flags */
 568         if (flags & (~SPU_CREATE_FLAG_ALL))
 569                 return -EINVAL;
 570
 571         /* only threads can be underneath a gang */
 572         if (path->dentry != path->dentry->d_sb->s_root)
 573                 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
 574                         return -EINVAL;
 575
 576         mode &= ~current_umask();
 577
 578         if (flags & SPU_CREATE_GANG)
 579                 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
 580         else
 581                 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
 582                                             filp);
 583         if (ret >= 0)
 584                 fsnotify_mkdir(dir, dentry);
 585
 586         return ret;
 587 }
 588
 589 /* File system initialization */
 590 enum {
 591         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 592 };
 593
 594 static const match_table_t spufs_tokens = {
 595         { Opt_uid,   "uid=%d" },
 596         { Opt_gid,   "gid=%d" },
 597         { Opt_mode,  "mode=%o" },
 598         { Opt_debug, "debug" },
 599         { Opt_err,    NULL  },
 600 };
 601
 602 static int spufs_show_options(struct seq_file *m, struct dentry *root)
 603 {
 604         struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
 605         struct inode *inode = root->d_inode;
 606
 607         if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
 608                 seq_printf(m, ",uid=%u",
 609                            from_kuid_munged(&init_user_ns, inode->i_uid));
 610         if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
 611                 seq_printf(m, ",gid=%u",
 612                            from_kgid_munged(&init_user_ns, inode->i_gid));
 613         if ((inode->i_mode & S_IALLUGO) != 0775)
 614                 seq_printf(m, ",mode=%o", inode->i_mode);
 615         if (sbi->debug)
 616                 seq_puts(m, ",debug");
 617         return 0;
 618 }
 619
 620 static int
 621 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 622 {
 623         char *p;
 624         substring_t args[MAX_OPT_ARGS];
 625
 626         while ((p = strsep(&options, ",")) != NULL) {
 627                 int token, option;
 628
 629                 if (!*p)
 630                         continue;
 631
 632                 token = match_token(p, spufs_tokens, args);
 633                 switch (token) {
 634                 case Opt_uid:
 635                         if (match_int(&args[0], &option))
 636                                 return 0;
 637                         root->i_uid = make_kuid(current_user_ns(), option);
 638                         if (!uid_valid(root->i_uid))
 639                                 return 0;
 640                         break;
 641                 case Opt_gid:
 642                         if (match_int(&args[0], &option))
 643                                 return 0;
 644                         root->i_gid = make_kgid(current_user_ns(), option);
 645                         if (!gid_valid(root->i_gid))
 646                                 return 0;
 647                         break;
 648                 case Opt_mode:
 649                         if (match_octal(&args[0], &option))
 650                                 return 0;
 651                         root->i_mode = option | S_IFDIR;
 652                         break;
 653                 case Opt_debug:
 654                         spufs_get_sb_info(sb)->debug = 1;
 655                         break;
 656                 default:
 657                         return 0;
 658                 }
 659         }
 660         return 1;
 661 }
 662
 663 static void spufs_exit_isolated_loader(void)
 664 {
 665         free_pages((unsigned long) isolated_loader,
 666                         get_order(isolated_loader_size));
 667 }
 668
 669 static void
 670 spufs_init_isolated_loader(void)
 671 {
 672         struct device_node *dn;
 673         const char *loader;
 674         int size;
 675
 676         dn = of_find_node_by_path("/spu-isolation");
 677         if (!dn)
 678                 return;
 679
 680         loader = of_get_property(dn, "loader", &size);
 681         if (!loader)
 682                 return;
 683
 684         /* the loader must be align on a 16 byte boundary */
 685         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 686         if (!isolated_loader)
 687                 return;
 688
 689         isolated_loader_size = size;
 690         memcpy(isolated_loader, loader, size);
 691         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 692 }
 693
 694 static int
 695 spufs_create_root(struct super_block *sb, void *data)
 696 {
 697         struct inode *inode;
 698         int ret;
 699
 700         ret = -ENODEV;
 701         if (!spu_management_ops)
 702                 goto out;
 703
 704         ret = -ENOMEM;
 705         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 706         if (!inode)
 707                 goto out;
 708
 709         inode->i_op = &simple_dir_inode_operations;
 710         inode->i_fop = &simple_dir_operations;
 711         SPUFS_I(inode)->i_ctx = NULL;
 712         inc_nlink(inode);
 713
 714         ret = -EINVAL;
 715         if (!spufs_parse_options(sb, data, inode))
 716                 goto out_iput;
 717
 718         ret = -ENOMEM;
 719         sb->s_root = d_make_root(inode);
 720         if (!sb->s_root)
 721                 goto out;
 722
 723         return 0;
 724 out_iput:
 725         iput(inode);
 726 out:
 727         return ret;
 728 }
 729
 730 static int
 731 spufs_fill_super(struct super_block *sb, void *data, int silent)
 732 {
 733         struct spufs_sb_info *info;
 734         static const struct super_operations s_ops = {
 735                 .alloc_inode = spufs_alloc_inode,
 736                 .free_inode = spufs_free_inode,
 737                 .statfs = simple_statfs,
 738                 .evict_inode = spufs_evict_inode,
 739                 .show_options = spufs_show_options,
 740         };
 741
 742         info = kzalloc(sizeof(*info), GFP_KERNEL);
 743         if (!info)
 744                 return -ENOMEM;
 745
 746         sb->s_maxbytes = MAX_LFS_FILESIZE;
 747         sb->s_blocksize = PAGE_SIZE;
 748         sb->s_blocksize_bits = PAGE_SHIFT;
 749         sb->s_magic = SPUFS_MAGIC;
 750         sb->s_op = &s_ops;
 751         sb->s_fs_info = info;
 752
 753         return spufs_create_root(sb, data);
 754 }
 755
 756 static struct dentry *
 757 spufs_mount(struct file_system_type *fstype, int flags,
 758                 const char *name, void *data)
 759 {
 760         return mount_single(fstype, flags, data, spufs_fill_super);
 761 }
 762
 763 static struct file_system_type spufs_type = {
 764         .owner = THIS_MODULE,
 765         .name = "spufs",
 766         .mount = spufs_mount,
 767         .kill_sb = kill_litter_super,
 768 };
 769 MODULE_ALIAS_FS("spufs");
 770
 771 static int __init spufs_init(void)
 772 {
 773         int ret;
 774
 775         ret = -ENODEV;
 776         if (!spu_management_ops)
 777                 goto out;
 778
 779         ret = -ENOMEM;
 780         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 781                         sizeof(struct spufs_inode_info), 0,
 782                         SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
 783
 784         if (!spufs_inode_cache)
 785                 goto out;
 786         ret = spu_sched_init();
 787         if (ret)
 788                 goto out_cache;
 789         ret = register_spu_syscalls(&spufs_calls);
 790         if (ret)
 791                 goto out_sched;
 792         ret = register_filesystem(&spufs_type);
 793         if (ret)
 794                 goto out_syscalls;
 795
 796         spufs_init_isolated_loader();
 797
 798         return 0;
 799
 800 out_syscalls:
 801         unregister_spu_syscalls(&spufs_calls);
 802 out_sched:
 803         spu_sched_exit();
 804 out_cache:
 805         kmem_cache_destroy(spufs_inode_cache);
 806 out:
 807         return ret;
 808 }
 809 module_init(spufs_init);
 810
 811 static void __exit spufs_exit(void)
 812 {
 813         spu_sched_exit();
 814         spufs_exit_isolated_loader();
 815         unregister_spu_syscalls(&spufs_calls);
 816         unregister_filesystem(&spufs_type);
 817         kmem_cache_destroy(spufs_inode_cache);
 818 }
 819 module_exit(spufs_exit);
 820
 821 MODULE_LICENSE("GPL");
 822 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 823