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
  75 spufs_destroy_inode(struct inode *inode)
  76 {
  77         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
  78 }
  79
  80 static void
  81 spufs_init_once(void *p)
  82 {
  83         struct spufs_inode_info *ei = p;
  84
  85         inode_init_once(&ei->vfs_inode);
  86 }
  87
  88 static struct inode *
  89 spufs_new_inode(struct super_block *sb, int mode)
  90 {
  91         struct inode *inode;
  92
  93         inode = new_inode(sb);
  94         if (!inode)
  95                 goto out;
  96
  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;
 101 out:
 102         return inode;
 103 }
 104
 105 static int
 106 spufs_setattr(struct dentry *dentry, struct iattr *attr)
 107 {
 108         struct inode *inode = dentry->d_inode;
 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, int 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_delete_inode(struct inode *inode)
 147 {
 148         struct spufs_inode_info *ei = SPUFS_I(inode);
 149
 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         clear_inode(inode);
 155 }
 156
 157 static void spufs_prune_dir(struct dentry *dir)
 158 {
 159         struct dentry *dentry, *tmp;
 160
 161         mutex_lock(&dir->d_inode->i_mutex);
 162         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 163                 spin_lock(&dcache_lock);
 164                 spin_lock(&dentry->d_lock);
 165                 if (!(d_unhashed(dentry)) && dentry->d_inode) {
 166                         dget_locked(dentry);
 167                         __d_drop(dentry);
 168                         spin_unlock(&dentry->d_lock);
 169                         simple_unlink(dir->d_inode, dentry);
 170                         spin_unlock(&dcache_lock);
 171                         dput(dentry);
 172                 } else {
 173                         spin_unlock(&dentry->d_lock);
 174                         spin_unlock(&dcache_lock);
 175                 }
 176         }
 177         shrink_dcache_parent(dir);
 178         mutex_unlock(&dir->d_inode->i_mutex);
 179 }
 180
 181 /* Caller must hold parent->i_mutex */
 182 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 183 {
 184         /* remove all entries */
 185         spufs_prune_dir(dir);
 186         d_drop(dir);
 187
 188         return simple_rmdir(parent, dir);
 189 }
 190
 191 static int spufs_fill_dir(struct dentry *dir,
 192                 const struct spufs_tree_descr *files, int mode,
 193                 struct spu_context *ctx)
 194 {
 195         struct dentry *dentry, *tmp;
 196         int ret;
 197
 198         while (files->name && files->name[0]) {
 199                 ret = -ENOMEM;
 200                 dentry = d_alloc_name(dir, files->name);
 201                 if (!dentry)
 202                         goto out;
 203                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 204                                         files->mode & mode, files->size, ctx);
 205                 if (ret)
 206                         goto out;
 207                 files++;
 208         }
 209         return 0;
 210 out:
 211         /*
 212          * remove all children from dir. dir->inode is not set so don't
 213          * just simply use spufs_prune_dir() and panic afterwards :)
 214          * dput() looks like it will do the right thing:
 215          * - dec parent's ref counter
 216          * - remove child from parent's child list
 217          * - free child's inode if possible
 218          * - free child
 219          */
 220         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
 221                 dput(dentry);
 222         }
 223
 224         shrink_dcache_parent(dir);
 225         return ret;
 226 }
 227
 228 static int spufs_dir_close(struct inode *inode, struct file *file)
 229 {
 230         struct spu_context *ctx;
 231         struct inode *parent;
 232         struct dentry *dir;
 233         int ret;
 234
 235         dir = file->f_path.dentry;
 236         parent = dir->d_parent->d_inode;
 237         ctx = SPUFS_I(dir->d_inode)->i_ctx;
 238
 239         mutex_lock_nested(&parent->i_mutex, I_MUTEX_PARENT);
 240         ret = spufs_rmdir(parent, dir);
 241         mutex_unlock(&parent->i_mutex);
 242         WARN_ON(ret);
 243
 244         /* We have to give up the mm_struct */
 245         spu_forget(ctx);
 246
 247         return dcache_dir_close(inode, file);
 248 }
 249
 250 const struct file_operations spufs_context_fops = {
 251         .open           = dcache_dir_open,
 252         .release        = spufs_dir_close,
 253         .llseek         = dcache_dir_lseek,
 254         .read           = generic_read_dir,
 255         .readdir        = dcache_readdir,
 256         .fsync          = noop_fsync,
 257 };
 258 EXPORT_SYMBOL_GPL(spufs_context_fops);
 259
 260 static int
 261 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 262                 int mode)
 263 {
 264         int ret;
 265         struct inode *inode;
 266         struct spu_context *ctx;
 267
 268         ret = -ENOSPC;
 269         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 270         if (!inode)
 271                 goto out;
 272
 273         if (dir->i_mode & S_ISGID) {
 274                 inode->i_gid = dir->i_gid;
 275                 inode->i_mode &= S_ISGID;
 276         }
 277         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 278         SPUFS_I(inode)->i_ctx = ctx;
 279         if (!ctx)
 280                 goto out_iput;
 281
 282         ctx->flags = flags;
 283         inode->i_op = &simple_dir_inode_operations;
 284         inode->i_fop = &simple_dir_operations;
 285         if (flags & SPU_CREATE_NOSCHED)
 286                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 287                                          mode, ctx);
 288         else
 289                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 290
 291         if (ret)
 292                 goto out_free_ctx;
 293
 294         if (spufs_get_sb_info(dir->i_sb)->debug)
 295                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 296                                 mode, ctx);
 297
 298         if (ret)
 299                 goto out_free_ctx;
 300
 301         d_instantiate(dentry, inode);
 302         dget(dentry);
 303         inc_nlink(dir);
 304         inc_nlink(dentry->d_inode);
 305         goto out;
 306
 307 out_free_ctx:
 308         spu_forget(ctx);
 309         put_spu_context(ctx);
 310 out_iput:
 311         iput(inode);
 312 out:
 313         return ret;
 314 }
 315
 316 static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
 317 {
 318         int ret;
 319         struct file *filp;
 320
 321         ret = get_unused_fd();
 322         if (ret < 0) {
 323                 dput(dentry);
 324                 mntput(mnt);
 325                 goto out;
 326         }
 327
 328         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 329         if (IS_ERR(filp)) {
 330                 put_unused_fd(ret);
 331                 ret = PTR_ERR(filp);
 332                 goto out;
 333         }
 334
 335         filp->f_op = &spufs_context_fops;
 336         fd_install(ret, filp);
 337 out:
 338         return ret;
 339 }
 340
 341 static struct spu_context *
 342 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 343                                                 struct file *filp)
 344 {
 345         struct spu_context *tmp, *neighbor, *err;
 346         int count, node;
 347         int aff_supp;
 348
 349         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 350                                         struct spu, cbe_list))->aff_list);
 351
 352         if (!aff_supp)
 353                 return ERR_PTR(-EINVAL);
 354
 355         if (flags & SPU_CREATE_GANG)
 356                 return ERR_PTR(-EINVAL);
 357
 358         if (flags & SPU_CREATE_AFFINITY_MEM &&
 359             gang->aff_ref_ctx &&
 360             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 361                 return ERR_PTR(-EEXIST);
 362
 363         if (gang->aff_flags & AFF_MERGED)
 364                 return ERR_PTR(-EBUSY);
 365
 366         neighbor = NULL;
 367         if (flags & SPU_CREATE_AFFINITY_SPU) {
 368                 if (!filp || filp->f_op != &spufs_context_fops)
 369                         return ERR_PTR(-EINVAL);
 370
 371                 neighbor = get_spu_context(
 372                                 SPUFS_I(filp->f_dentry->d_inode)->i_ctx);
 373
 374                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 375                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 376                     !list_entry(neighbor->aff_list.next, struct spu_context,
 377                     aff_list)->aff_head) {
 378                         err = ERR_PTR(-EEXIST);
 379                         goto out_put_neighbor;
 380                 }
 381
 382                 if (gang != neighbor->gang) {
 383                         err = ERR_PTR(-EINVAL);
 384                         goto out_put_neighbor;
 385                 }
 386
 387                 count = 1;
 388                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 389                         count++;
 390                 if (list_empty(&neighbor->aff_list))
 391                         count++;
 392
 393                 for (node = 0; node < MAX_NUMNODES; node++) {
 394                         if ((cbe_spu_info[node].n_spus - atomic_read(
 395                                 &cbe_spu_info[node].reserved_spus)) >= count)
 396                                 break;
 397                 }
 398
 399                 if (node == MAX_NUMNODES) {
 400                         err = ERR_PTR(-EEXIST);
 401                         goto out_put_neighbor;
 402                 }
 403         }
 404
 405         return neighbor;
 406
 407 out_put_neighbor:
 408         put_spu_context(neighbor);
 409         return err;
 410 }
 411
 412 static void
 413 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 414                                         struct spu_context *neighbor)
 415 {
 416         if (flags & SPU_CREATE_AFFINITY_MEM)
 417                 ctx->gang->aff_ref_ctx = ctx;
 418
 419         if (flags & SPU_CREATE_AFFINITY_SPU) {
 420                 if (list_empty(&neighbor->aff_list)) {
 421                         list_add_tail(&neighbor->aff_list,
 422                                 &ctx->gang->aff_list_head);
 423                         neighbor->aff_head = 1;
 424                 }
 425
 426                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 427                     || list_entry(neighbor->aff_list.next, struct spu_context,
 428                                                         aff_list)->aff_head) {
 429                         list_add(&ctx->aff_list, &neighbor->aff_list);
 430                 } else  {
 431                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 432                         if (neighbor->aff_head) {
 433                                 neighbor->aff_head = 0;
 434                                 ctx->aff_head = 1;
 435                         }
 436                 }
 437
 438                 if (!ctx->gang->aff_ref_ctx)
 439                         ctx->gang->aff_ref_ctx = ctx;
 440         }
 441 }
 442
 443 static int
 444 spufs_create_context(struct inode *inode, struct dentry *dentry,
 445                         struct vfsmount *mnt, int flags, int mode,
 446                         struct file *aff_filp)
 447 {
 448         int ret;
 449         int affinity;
 450         struct spu_gang *gang;
 451         struct spu_context *neighbor;
 452
 453         ret = -EPERM;
 454         if ((flags & SPU_CREATE_NOSCHED) &&
 455             !capable(CAP_SYS_NICE))
 456                 goto out_unlock;
 457
 458         ret = -EINVAL;
 459         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 460             == SPU_CREATE_ISOLATE)
 461                 goto out_unlock;
 462
 463         ret = -ENODEV;
 464         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 465                 goto out_unlock;
 466
 467         gang = NULL;
 468         neighbor = NULL;
 469         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 470         if (affinity) {
 471                 gang = SPUFS_I(inode)->i_gang;
 472                 ret = -EINVAL;
 473                 if (!gang)
 474                         goto out_unlock;
 475                 mutex_lock(&gang->aff_mutex);
 476                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 477                 if (IS_ERR(neighbor)) {
 478                         ret = PTR_ERR(neighbor);
 479                         goto out_aff_unlock;
 480                 }
 481         }
 482
 483         ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
 484         if (ret)
 485                 goto out_aff_unlock;
 486
 487         if (affinity) {
 488                 spufs_set_affinity(flags, SPUFS_I(dentry->d_inode)->i_ctx,
 489                                                                 neighbor);
 490                 if (neighbor)
 491                         put_spu_context(neighbor);
 492         }
 493
 494         /*
 495          * get references for dget and mntget, will be released
 496          * in error path of *_open().
 497          */
 498         ret = spufs_context_open(dget(dentry), mntget(mnt));
 499         if (ret < 0) {
 500                 WARN_ON(spufs_rmdir(inode, dentry));
 501                 if (affinity)
 502                         mutex_unlock(&gang->aff_mutex);
 503                 mutex_unlock(&inode->i_mutex);
 504                 spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
 505                 goto out;
 506         }
 507
 508 out_aff_unlock:
 509         if (affinity)
 510                 mutex_unlock(&gang->aff_mutex);
 511 out_unlock:
 512         mutex_unlock(&inode->i_mutex);
 513 out:
 514         dput(dentry);
 515         return ret;
 516 }
 517
 518 static int
 519 spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
 520 {
 521         int ret;
 522         struct inode *inode;
 523         struct spu_gang *gang;
 524
 525         ret = -ENOSPC;
 526         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 527         if (!inode)
 528                 goto out;
 529
 530         ret = 0;
 531         if (dir->i_mode & S_ISGID) {
 532                 inode->i_gid = dir->i_gid;
 533                 inode->i_mode &= S_ISGID;
 534         }
 535         gang = alloc_spu_gang();
 536         SPUFS_I(inode)->i_ctx = NULL;
 537         SPUFS_I(inode)->i_gang = gang;
 538         if (!gang)
 539                 goto out_iput;
 540
 541         inode->i_op = &simple_dir_inode_operations;
 542         inode->i_fop = &simple_dir_operations;
 543
 544         d_instantiate(dentry, inode);
 545         inc_nlink(dir);
 546         inc_nlink(dentry->d_inode);
 547         return ret;
 548
 549 out_iput:
 550         iput(inode);
 551 out:
 552         return ret;
 553 }
 554
 555 static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt)
 556 {
 557         int ret;
 558         struct file *filp;
 559
 560         ret = get_unused_fd();
 561         if (ret < 0) {
 562                 dput(dentry);
 563                 mntput(mnt);
 564                 goto out;
 565         }
 566
 567         filp = dentry_open(dentry, mnt, O_RDONLY, current_cred());
 568         if (IS_ERR(filp)) {
 569                 put_unused_fd(ret);
 570                 ret = PTR_ERR(filp);
 571                 goto out;
 572         }
 573
 574         filp->f_op = &simple_dir_operations;
 575         fd_install(ret, filp);
 576 out:
 577         return ret;
 578 }
 579
 580 static int spufs_create_gang(struct inode *inode,
 581                         struct dentry *dentry,
 582                         struct vfsmount *mnt, int mode)
 583 {
 584         int ret;
 585
 586         ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
 587         if (ret)
 588                 goto out;
 589
 590         /*
 591          * get references for dget and mntget, will be released
 592          * in error path of *_open().
 593          */
 594         ret = spufs_gang_open(dget(dentry), mntget(mnt));
 595         if (ret < 0) {
 596                 int err = simple_rmdir(inode, dentry);
 597                 WARN_ON(err);
 598         }
 599
 600 out:
 601         mutex_unlock(&inode->i_mutex);
 602         dput(dentry);
 603         return ret;
 604 }
 605
 606
 607 static struct file_system_type spufs_type;
 608
 609 long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
 610                                                         struct file *filp)
 611 {
 612         struct dentry *dentry;
 613         int ret;
 614
 615         ret = -EINVAL;
 616         /* check if we are on spufs */
 617         if (nd->path.dentry->d_sb->s_type != &spufs_type)
 618                 goto out;
 619
 620         /* don't accept undefined flags */
 621         if (flags & (~SPU_CREATE_FLAG_ALL))
 622                 goto out;
 623
 624         /* only threads can be underneath a gang */
 625         if (nd->path.dentry != nd->path.dentry->d_sb->s_root) {
 626                 if ((flags & SPU_CREATE_GANG) ||
 627                     !SPUFS_I(nd->path.dentry->d_inode)->i_gang)
 628                         goto out;
 629         }
 630
 631         dentry = lookup_create(nd, 1);
 632         ret = PTR_ERR(dentry);
 633         if (IS_ERR(dentry))
 634                 goto out_dir;
 635
 636         mode &= ~current_umask();
 637
 638         if (flags & SPU_CREATE_GANG)
 639                 ret = spufs_create_gang(nd->path.dentry->d_inode,
 640                                          dentry, nd->path.mnt, mode);
 641         else
 642                 ret = spufs_create_context(nd->path.dentry->d_inode,
 643                                             dentry, nd->path.mnt, flags, mode,
 644                                             filp);
 645         if (ret >= 0)
 646                 fsnotify_mkdir(nd->path.dentry->d_inode, dentry);
 647         return ret;
 648
 649 out_dir:
 650         mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
 651 out:
 652         return ret;
 653 }
 654
 655 /* File system initialization */
 656 enum {
 657         Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
 658 };
 659
 660 static const match_table_t spufs_tokens = {
 661         { Opt_uid,   "uid=%d" },
 662         { Opt_gid,   "gid=%d" },
 663         { Opt_mode,  "mode=%o" },
 664         { Opt_debug, "debug" },
 665         { Opt_err,    NULL  },
 666 };
 667
 668 static int
 669 spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
 670 {
 671         char *p;
 672         substring_t args[MAX_OPT_ARGS];
 673
 674         while ((p = strsep(&options, ",")) != NULL) {
 675                 int token, option;
 676
 677                 if (!*p)
 678                         continue;
 679
 680                 token = match_token(p, spufs_tokens, args);
 681                 switch (token) {
 682                 case Opt_uid:
 683                         if (match_int(&args[0], &option))
 684                                 return 0;
 685                         root->i_uid = option;
 686                         break;
 687                 case Opt_gid:
 688                         if (match_int(&args[0], &option))
 689                                 return 0;
 690                         root->i_gid = option;
 691                         break;
 692                 case Opt_mode:
 693                         if (match_octal(&args[0], &option))
 694                                 return 0;
 695                         root->i_mode = option | S_IFDIR;
 696                         break;
 697                 case Opt_debug:
 698                         spufs_get_sb_info(sb)->debug = 1;
 699                         break;
 700                 default:
 701                         return 0;
 702                 }
 703         }
 704         return 1;
 705 }
 706
 707 static void spufs_exit_isolated_loader(void)
 708 {
 709         free_pages((unsigned long) isolated_loader,
 710                         get_order(isolated_loader_size));
 711 }
 712
 713 static void
 714 spufs_init_isolated_loader(void)
 715 {
 716         struct device_node *dn;
 717         const char *loader;
 718         int size;
 719
 720         dn = of_find_node_by_path("/spu-isolation");
 721         if (!dn)
 722                 return;
 723
 724         loader = of_get_property(dn, "loader", &size);
 725         if (!loader)
 726                 return;
 727
 728         /* the loader must be align on a 16 byte boundary */
 729         isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size));
 730         if (!isolated_loader)
 731                 return;
 732
 733         isolated_loader_size = size;
 734         memcpy(isolated_loader, loader, size);
 735         printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
 736 }
 737
 738 static int
 739 spufs_create_root(struct super_block *sb, void *data)
 740 {
 741         struct inode *inode;
 742         int ret;
 743
 744         ret = -ENODEV;
 745         if (!spu_management_ops)
 746                 goto out;
 747
 748         ret = -ENOMEM;
 749         inode = spufs_new_inode(sb, S_IFDIR | 0775);
 750         if (!inode)
 751                 goto out;
 752
 753         inode->i_op = &simple_dir_inode_operations;
 754         inode->i_fop = &simple_dir_operations;
 755         SPUFS_I(inode)->i_ctx = NULL;
 756         inc_nlink(inode);
 757
 758         ret = -EINVAL;
 759         if (!spufs_parse_options(sb, data, inode))
 760                 goto out_iput;
 761
 762         ret = -ENOMEM;
 763         sb->s_root = d_alloc_root(inode);
 764         if (!sb->s_root)
 765                 goto out_iput;
 766
 767         return 0;
 768 out_iput:
 769         iput(inode);
 770 out:
 771         return ret;
 772 }
 773
 774 static int
 775 spufs_fill_super(struct super_block *sb, void *data, int silent)
 776 {
 777         struct spufs_sb_info *info;
 778         static const struct super_operations s_ops = {
 779                 .alloc_inode = spufs_alloc_inode,
 780                 .destroy_inode = spufs_destroy_inode,
 781                 .statfs = simple_statfs,
 782                 .delete_inode = spufs_delete_inode,
 783                 .drop_inode = generic_delete_inode,
 784                 .show_options = generic_show_options,
 785         };
 786
 787         save_mount_options(sb, data);
 788
 789         info = kzalloc(sizeof(*info), GFP_KERNEL);
 790         if (!info)
 791                 return -ENOMEM;
 792
 793         sb->s_maxbytes = MAX_LFS_FILESIZE;
 794         sb->s_blocksize = PAGE_CACHE_SIZE;
 795         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 796         sb->s_magic = SPUFS_MAGIC;
 797         sb->s_op = &s_ops;
 798         sb->s_fs_info = info;
 799
 800         return spufs_create_root(sb, data);
 801 }
 802
 803 static int
 804 spufs_get_sb(struct file_system_type *fstype, int flags,
 805                 const char *name, void *data, struct vfsmount *mnt)
 806 {
 807         return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
 808 }
 809
 810 static struct file_system_type spufs_type = {
 811         .owner = THIS_MODULE,
 812         .name = "spufs",
 813         .get_sb = spufs_get_sb,
 814         .kill_sb = kill_litter_super,
 815 };
 816
 817 static int __init spufs_init(void)
 818 {
 819         int ret;
 820
 821         ret = -ENODEV;
 822         if (!spu_management_ops)
 823                 goto out;
 824
 825         ret = -ENOMEM;
 826         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 827                         sizeof(struct spufs_inode_info), 0,
 828                         SLAB_HWCACHE_ALIGN, spufs_init_once);
 829
 830         if (!spufs_inode_cache)
 831                 goto out;
 832         ret = spu_sched_init();
 833         if (ret)
 834                 goto out_cache;
 835         ret = register_filesystem(&spufs_type);
 836         if (ret)
 837                 goto out_sched;
 838         ret = register_spu_syscalls(&spufs_calls);
 839         if (ret)
 840                 goto out_fs;
 841
 842         spufs_init_isolated_loader();
 843
 844         return 0;
 845
 846 out_fs:
 847         unregister_filesystem(&spufs_type);
 848 out_sched:
 849         spu_sched_exit();
 850 out_cache:
 851         kmem_cache_destroy(spufs_inode_cache);
 852 out:
 853         return ret;
 854 }
 855 module_init(spufs_init);
 856
 857 static void __exit spufs_exit(void)
 858 {
 859         spu_sched_exit();
 860         spufs_exit_isolated_loader();
 861         unregister_spu_syscalls(&spufs_calls);
 862         unregister_filesystem(&spufs_type);
 863         kmem_cache_destroy(spufs_inode_cache);
 864 }
 865 module_exit(spufs_exit);
 866
 867 MODULE_LICENSE("GPL");
 868 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 869