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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /*
   4  * SPU file system
   5  *
   6  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
   7  *
   8  * Author: Arnd Bergmann <arndb@de.ibm.com>
   9  */
  10
  11 #include <linux/file.h>
  12 #include <linux/fs.h>
  13 #include <linux/fs_context.h>
  14 #include <linux/fs_parser.h>
  15 #include <linux/fsnotify.h>
  16 #include <linux/backing-dev.h>
  17 #include <linux/init.h>
  18 #include <linux/ioctl.h>
  19 #include <linux/module.h>
  20 #include <linux/mount.h>
  21 #include <linux/namei.h>
  22 #include <linux/pagemap.h>
  23 #include <linux/poll.h>
  24 #include <linux/slab.h>
  25
  26 #include <asm/prom.h>
  27 #include <asm/spu.h>
  28 #include <asm/spu_priv1.h>
  29 #include <linux/uaccess.h>
  30
  31 #include "spufs.h"
  32
  33 struct spufs_sb_info {
  34         bool debug;
  35 };
  36
  37 static struct kmem_cache *spufs_inode_cache;
  38 char *isolated_loader;
  39 static int isolated_loader_size;
  40
  41 static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
  42 {
  43         return sb->s_fs_info;
  44 }
  45
  46 static struct inode *
  47 spufs_alloc_inode(struct super_block *sb)
  48 {
  49         struct spufs_inode_info *ei;
  50
  51         ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
  52         if (!ei)
  53                 return NULL;
  54
  55         ei->i_gang = NULL;
  56         ei->i_ctx = NULL;
  57         ei->i_openers = 0;
  58
  59         return &ei->vfs_inode;
  60 }
  61
  62 static void spufs_free_inode(struct inode *inode)
  63 {
  64         kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
  65 }
  66
  67 static void
  68 spufs_init_once(void *p)
  69 {
  70         struct spufs_inode_info *ei = p;
  71
  72         inode_init_once(&ei->vfs_inode);
  73 }
  74
  75 static struct inode *
  76 spufs_new_inode(struct super_block *sb, umode_t mode)
  77 {
  78         struct inode *inode;
  79
  80         inode = new_inode(sb);
  81         if (!inode)
  82                 goto out;
  83
  84         inode->i_ino = get_next_ino();
  85         inode->i_mode = mode;
  86         inode->i_uid = current_fsuid();
  87         inode->i_gid = current_fsgid();
  88         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
  89 out:
  90         return inode;
  91 }
  92
  93 static int
  94 spufs_setattr(struct dentry *dentry, struct iattr *attr)
  95 {
  96         struct inode *inode = d_inode(dentry);
  97
  98         if ((attr->ia_valid & ATTR_SIZE) &&
  99             (attr->ia_size != inode->i_size))
 100                 return -EINVAL;
 101         setattr_copy(inode, attr);
 102         mark_inode_dirty(inode);
 103         return 0;
 104 }
 105
 106
 107 static int
 108 spufs_new_file(struct super_block *sb, struct dentry *dentry,
 109                 const struct file_operations *fops, umode_t mode,
 110                 size_t size, struct spu_context *ctx)
 111 {
 112         static const struct inode_operations spufs_file_iops = {
 113                 .setattr = spufs_setattr,
 114         };
 115         struct inode *inode;
 116         int ret;
 117
 118         ret = -ENOSPC;
 119         inode = spufs_new_inode(sb, S_IFREG | mode);
 120         if (!inode)
 121                 goto out;
 122
 123         ret = 0;
 124         inode->i_op = &spufs_file_iops;
 125         inode->i_fop = fops;
 126         inode->i_size = size;
 127         inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
 128         d_add(dentry, inode);
 129 out:
 130         return ret;
 131 }
 132
 133 static void
 134 spufs_evict_inode(struct inode *inode)
 135 {
 136         struct spufs_inode_info *ei = SPUFS_I(inode);
 137         clear_inode(inode);
 138         if (ei->i_ctx)
 139                 put_spu_context(ei->i_ctx);
 140         if (ei->i_gang)
 141                 put_spu_gang(ei->i_gang);
 142 }
 143
 144 static void spufs_prune_dir(struct dentry *dir)
 145 {
 146         struct dentry *dentry, *tmp;
 147
 148         inode_lock(d_inode(dir));
 149         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
 150                 spin_lock(&dentry->d_lock);
 151                 if (simple_positive(dentry)) {
 152                         dget_dlock(dentry);
 153                         __d_drop(dentry);
 154                         spin_unlock(&dentry->d_lock);
 155                         simple_unlink(d_inode(dir), dentry);
 156                         /* XXX: what was dcache_lock protecting here? Other
 157                          * filesystems (IB, configfs) release dcache_lock
 158                          * before unlink */
 159                         dput(dentry);
 160                 } else {
 161                         spin_unlock(&dentry->d_lock);
 162                 }
 163         }
 164         shrink_dcache_parent(dir);
 165         inode_unlock(d_inode(dir));
 166 }
 167
 168 /* Caller must hold parent->i_mutex */
 169 static int spufs_rmdir(struct inode *parent, struct dentry *dir)
 170 {
 171         /* remove all entries */
 172         int res;
 173         spufs_prune_dir(dir);
 174         d_drop(dir);
 175         res = simple_rmdir(parent, dir);
 176         /* We have to give up the mm_struct */
 177         spu_forget(SPUFS_I(d_inode(dir))->i_ctx);
 178         return res;
 179 }
 180
 181 static int spufs_fill_dir(struct dentry *dir,
 182                 const struct spufs_tree_descr *files, umode_t mode,
 183                 struct spu_context *ctx)
 184 {
 185         while (files->name && files->name[0]) {
 186                 int ret;
 187                 struct dentry *dentry = d_alloc_name(dir, files->name);
 188                 if (!dentry)
 189                         return -ENOMEM;
 190                 ret = spufs_new_file(dir->d_sb, dentry, files->ops,
 191                                         files->mode & mode, files->size, ctx);
 192                 if (ret)
 193                         return ret;
 194                 files++;
 195         }
 196         return 0;
 197 }
 198
 199 static int spufs_dir_close(struct inode *inode, struct file *file)
 200 {
 201         struct inode *parent;
 202         struct dentry *dir;
 203         int ret;
 204
 205         dir = file->f_path.dentry;
 206         parent = d_inode(dir->d_parent);
 207
 208         inode_lock_nested(parent, I_MUTEX_PARENT);
 209         ret = spufs_rmdir(parent, dir);
 210         inode_unlock(parent);
 211         WARN_ON(ret);
 212
 213         return dcache_dir_close(inode, file);
 214 }
 215
 216 const struct file_operations spufs_context_fops = {
 217         .open           = dcache_dir_open,
 218         .release        = spufs_dir_close,
 219         .llseek         = dcache_dir_lseek,
 220         .read           = generic_read_dir,
 221         .iterate_shared = dcache_readdir,
 222         .fsync          = noop_fsync,
 223 };
 224 EXPORT_SYMBOL_GPL(spufs_context_fops);
 225
 226 static int
 227 spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
 228                 umode_t mode)
 229 {
 230         int ret;
 231         struct inode *inode;
 232         struct spu_context *ctx;
 233
 234         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 235         if (!inode)
 236                 return -ENOSPC;
 237
 238         if (dir->i_mode & S_ISGID) {
 239                 inode->i_gid = dir->i_gid;
 240                 inode->i_mode &= S_ISGID;
 241         }
 242         ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
 243         SPUFS_I(inode)->i_ctx = ctx;
 244         if (!ctx) {
 245                 iput(inode);
 246                 return -ENOSPC;
 247         }
 248
 249         ctx->flags = flags;
 250         inode->i_op = &simple_dir_inode_operations;
 251         inode->i_fop = &simple_dir_operations;
 252
 253         inode_lock(inode);
 254
 255         dget(dentry);
 256         inc_nlink(dir);
 257         inc_nlink(inode);
 258
 259         d_instantiate(dentry, inode);
 260
 261         if (flags & SPU_CREATE_NOSCHED)
 262                 ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
 263                                          mode, ctx);
 264         else
 265                 ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
 266
 267         if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
 268                 ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
 269                                 mode, ctx);
 270
 271         if (ret)
 272                 spufs_rmdir(dir, dentry);
 273
 274         inode_unlock(inode);
 275
 276         return ret;
 277 }
 278
 279 static int spufs_context_open(struct path *path)
 280 {
 281         int ret;
 282         struct file *filp;
 283
 284         ret = get_unused_fd_flags(0);
 285         if (ret < 0)
 286                 return ret;
 287
 288         filp = dentry_open(path, O_RDONLY, current_cred());
 289         if (IS_ERR(filp)) {
 290                 put_unused_fd(ret);
 291                 return PTR_ERR(filp);
 292         }
 293
 294         filp->f_op = &spufs_context_fops;
 295         fd_install(ret, filp);
 296         return ret;
 297 }
 298
 299 static struct spu_context *
 300 spufs_assert_affinity(unsigned int flags, struct spu_gang *gang,
 301                                                 struct file *filp)
 302 {
 303         struct spu_context *tmp, *neighbor, *err;
 304         int count, node;
 305         int aff_supp;
 306
 307         aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next,
 308                                         struct spu, cbe_list))->aff_list);
 309
 310         if (!aff_supp)
 311                 return ERR_PTR(-EINVAL);
 312
 313         if (flags & SPU_CREATE_GANG)
 314                 return ERR_PTR(-EINVAL);
 315
 316         if (flags & SPU_CREATE_AFFINITY_MEM &&
 317             gang->aff_ref_ctx &&
 318             gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM)
 319                 return ERR_PTR(-EEXIST);
 320
 321         if (gang->aff_flags & AFF_MERGED)
 322                 return ERR_PTR(-EBUSY);
 323
 324         neighbor = NULL;
 325         if (flags & SPU_CREATE_AFFINITY_SPU) {
 326                 if (!filp || filp->f_op != &spufs_context_fops)
 327                         return ERR_PTR(-EINVAL);
 328
 329                 neighbor = get_spu_context(
 330                                 SPUFS_I(file_inode(filp))->i_ctx);
 331
 332                 if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) &&
 333                     !list_is_last(&neighbor->aff_list, &gang->aff_list_head) &&
 334                     !list_entry(neighbor->aff_list.next, struct spu_context,
 335                     aff_list)->aff_head) {
 336                         err = ERR_PTR(-EEXIST);
 337                         goto out_put_neighbor;
 338                 }
 339
 340                 if (gang != neighbor->gang) {
 341                         err = ERR_PTR(-EINVAL);
 342                         goto out_put_neighbor;
 343                 }
 344
 345                 count = 1;
 346                 list_for_each_entry(tmp, &gang->aff_list_head, aff_list)
 347                         count++;
 348                 if (list_empty(&neighbor->aff_list))
 349                         count++;
 350
 351                 for (node = 0; node < MAX_NUMNODES; node++) {
 352                         if ((cbe_spu_info[node].n_spus - atomic_read(
 353                                 &cbe_spu_info[node].reserved_spus)) >= count)
 354                                 break;
 355                 }
 356
 357                 if (node == MAX_NUMNODES) {
 358                         err = ERR_PTR(-EEXIST);
 359                         goto out_put_neighbor;
 360                 }
 361         }
 362
 363         return neighbor;
 364
 365 out_put_neighbor:
 366         put_spu_context(neighbor);
 367         return err;
 368 }
 369
 370 static void
 371 spufs_set_affinity(unsigned int flags, struct spu_context *ctx,
 372                                         struct spu_context *neighbor)
 373 {
 374         if (flags & SPU_CREATE_AFFINITY_MEM)
 375                 ctx->gang->aff_ref_ctx = ctx;
 376
 377         if (flags & SPU_CREATE_AFFINITY_SPU) {
 378                 if (list_empty(&neighbor->aff_list)) {
 379                         list_add_tail(&neighbor->aff_list,
 380                                 &ctx->gang->aff_list_head);
 381                         neighbor->aff_head = 1;
 382                 }
 383
 384                 if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head)
 385                     || list_entry(neighbor->aff_list.next, struct spu_context,
 386                                                         aff_list)->aff_head) {
 387                         list_add(&ctx->aff_list, &neighbor->aff_list);
 388                 } else  {
 389                         list_add_tail(&ctx->aff_list, &neighbor->aff_list);
 390                         if (neighbor->aff_head) {
 391                                 neighbor->aff_head = 0;
 392                                 ctx->aff_head = 1;
 393                         }
 394                 }
 395
 396                 if (!ctx->gang->aff_ref_ctx)
 397                         ctx->gang->aff_ref_ctx = ctx;
 398         }
 399 }
 400
 401 static int
 402 spufs_create_context(struct inode *inode, struct dentry *dentry,
 403                         struct vfsmount *mnt, int flags, umode_t mode,
 404                         struct file *aff_filp)
 405 {
 406         int ret;
 407         int affinity;
 408         struct spu_gang *gang;
 409         struct spu_context *neighbor;
 410         struct path path = {.mnt = mnt, .dentry = dentry};
 411
 412         if ((flags & SPU_CREATE_NOSCHED) &&
 413             !capable(CAP_SYS_NICE))
 414                 return -EPERM;
 415
 416         if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
 417             == SPU_CREATE_ISOLATE)
 418                 return -EINVAL;
 419
 420         if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
 421                 return -ENODEV;
 422
 423         gang = NULL;
 424         neighbor = NULL;
 425         affinity = flags & (SPU_CREATE_AFFINITY_MEM | SPU_CREATE_AFFINITY_SPU);
 426         if (affinity) {
 427                 gang = SPUFS_I(inode)->i_gang;
 428                 if (!gang)
 429                         return -EINVAL;
 430                 mutex_lock(&gang->aff_mutex);
 431                 neighbor = spufs_assert_affinity(flags, gang, aff_filp);
 432                 if (IS_ERR(neighbor)) {
 433                         ret = PTR_ERR(neighbor);
 434                         goto out_aff_unlock;
 435                 }
 436         }
 437
 438         ret = spufs_mkdir(inode, dentry, flags, mode & 0777);
 439         if (ret)
 440                 goto out_aff_unlock;
 441
 442         if (affinity) {
 443                 spufs_set_affinity(flags, SPUFS_I(d_inode(dentry))->i_ctx,
 444                                                                 neighbor);
 445                 if (neighbor)
 446                         put_spu_context(neighbor);
 447         }
 448
 449         ret = spufs_context_open(&path);
 450         if (ret < 0)
 451                 WARN_ON(spufs_rmdir(inode, dentry));
 452
 453 out_aff_unlock:
 454         if (affinity)
 455                 mutex_unlock(&gang->aff_mutex);
 456         return ret;
 457 }
 458
 459 static int
 460 spufs_mkgang(struct inode *dir, struct dentry *dentry, umode_t mode)
 461 {
 462         int ret;
 463         struct inode *inode;
 464         struct spu_gang *gang;
 465
 466         ret = -ENOSPC;
 467         inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
 468         if (!inode)
 469                 goto out;
 470
 471         ret = 0;
 472         if (dir->i_mode & S_ISGID) {
 473                 inode->i_gid = dir->i_gid;
 474                 inode->i_mode &= S_ISGID;
 475         }
 476         gang = alloc_spu_gang();
 477         SPUFS_I(inode)->i_ctx = NULL;
 478         SPUFS_I(inode)->i_gang = gang;
 479         if (!gang) {
 480                 ret = -ENOMEM;
 481                 goto out_iput;
 482         }
 483
 484         inode->i_op = &simple_dir_inode_operations;
 485         inode->i_fop = &simple_dir_operations;
 486
 487         d_instantiate(dentry, inode);
 488         inc_nlink(dir);
 489         inc_nlink(d_inode(dentry));
 490         return ret;
 491
 492 out_iput:
 493         iput(inode);
 494 out:
 495         return ret;
 496 }
 497
 498 static int spufs_gang_open(struct path *path)
 499 {
 500         int ret;
 501         struct file *filp;
 502
 503         ret = get_unused_fd_flags(0);
 504         if (ret < 0)
 505                 return ret;
 506
 507         /*
 508          * get references for dget and mntget, will be released
 509          * in error path of *_open().
 510          */
 511         filp = dentry_open(path, O_RDONLY, current_cred());
 512         if (IS_ERR(filp)) {
 513                 put_unused_fd(ret);
 514                 return PTR_ERR(filp);
 515         }
 516
 517         filp->f_op = &simple_dir_operations;
 518         fd_install(ret, filp);
 519         return ret;
 520 }
 521
 522 static int spufs_create_gang(struct inode *inode,
 523                         struct dentry *dentry,
 524                         struct vfsmount *mnt, umode_t mode)
 525 {
 526         struct path path = {.mnt = mnt, .dentry = dentry};
 527         int ret;
 528
 529         ret = spufs_mkgang(inode, dentry, mode & 0777);
 530         if (!ret) {
 531                 ret = spufs_gang_open(&path);
 532                 if (ret < 0) {
 533                         int err = simple_rmdir(inode, dentry);
 534                         WARN_ON(err);
 535                 }
 536         }
 537         return ret;
 538 }
 539
 540
 541 static struct file_system_type spufs_type;
 542
 543 long spufs_create(struct path *path, struct dentry *dentry,
 544                 unsigned int flags, umode_t mode, struct file *filp)
 545 {
 546         struct inode *dir = d_inode(path->dentry);
 547         int ret;
 548
 549         /* check if we are on spufs */
 550         if (path->dentry->d_sb->s_type != &spufs_type)
 551                 return -EINVAL;
 552
 553         /* don't accept undefined flags */
 554         if (flags & (~SPU_CREATE_FLAG_ALL))
 555                 return -EINVAL;
 556
 557         /* only threads can be underneath a gang */
 558         if (path->dentry != path->dentry->d_sb->s_root)
 559                 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang)
 560                         return -EINVAL;
 561
 562         mode &= ~current_umask();
 563
 564         if (flags & SPU_CREATE_GANG)
 565                 ret = spufs_create_gang(dir, dentry, path->mnt, mode);
 566         else
 567                 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode,
 568                                             filp);
 569         if (ret >= 0)
 570                 fsnotify_mkdir(dir, dentry);
 571
 572         return ret;
 573 }
 574
 575 /* File system initialization */
 576 struct spufs_fs_context {
 577         kuid_t  uid;
 578         kgid_t  gid;
 579         umode_t mode;
 580 };
 581
 582 enum {
 583         Opt_uid, Opt_gid, Opt_mode, Opt_debug,
 584 };
 585
 586 static const struct fs_parameter_spec spufs_fs_parameters[] = {
 587         fsparam_u32     ("gid",                         Opt_gid),
 588         fsparam_u32oct  ("mode",                        Opt_mode),
 589         fsparam_u32     ("uid",                         Opt_uid),
 590         fsparam_flag    ("debug",                       Opt_debug),
 591         {}
 592 };
 593
 594 static int spufs_show_options(struct seq_file *m, struct dentry *root)
 595 {
 596         struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb);
 597         struct inode *inode = root->d_inode;
 598
 599         if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID))
 600                 seq_printf(m, ",uid=%u",
 601                            from_kuid_munged(&init_user_ns, inode->i_uid));
 602         if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID))
 603                 seq_printf(m, ",gid=%u",
 604                            from_kgid_munged(&init_user_ns, inode->i_gid));
 605         if ((inode->i_mode & S_IALLUGO) != 0775)
 606                 seq_printf(m, ",mode=%o", inode->i_mode);
 607         if (sbi->debug)
 608                 seq_puts(m, ",debug");
 609         return 0;
 610 }
 611
 612 static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
 613 {
 614         struct spufs_fs_context *ctx = fc->fs_private;
 615         struct spufs_sb_info *sbi = fc->s_fs_info;
 616         struct fs_parse_result result;
 617         kuid_t uid;
 618         kgid_t gid;
 619         int opt;
 620
 621         opt = fs_parse(fc, spufs_fs_parameters, param, &result);
 622         if (opt < 0)
 623                 return opt;
 624
 625         switch (opt) {
 626         case Opt_uid:
 627                 uid = make_kuid(current_user_ns(), result.uint_32);
 628                 if (!uid_valid(uid))
 629                         return invalf(fc, "Unknown uid");
 630                 ctx->uid = uid;
 631                 break;
 632         case Opt_gid:
 633                 gid = make_kgid(current_user_ns(), result.uint_32);
 634                 if (!gid_valid(gid))
 635                         return invalf(fc, "Unknown gid");
 636                 ctx->gid = gid;
 637                 break;
 638         case Opt_mode:
 639                 ctx->mode = result.uint_32 & S_IALLUGO;
 640                 break;
 641         case Opt_debug:
 642                 sbi->debug = true;
 643                 break;
 644         }
 645
 646         return 0;
 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 spufs_create_root(struct super_block *sb, struct fs_context *fc)
 681 {
 682         struct spufs_fs_context *ctx = fc->fs_private;
 683         struct inode *inode;
 684
 685         if (!spu_management_ops)
 686                 return -ENODEV;
 687
 688         inode = spufs_new_inode(sb, S_IFDIR | ctx->mode);
 689         if (!inode)
 690                 return -ENOMEM;
 691
 692         inode->i_uid = ctx->uid;
 693         inode->i_gid = ctx->gid;
 694         inode->i_op = &simple_dir_inode_operations;
 695         inode->i_fop = &simple_dir_operations;
 696         SPUFS_I(inode)->i_ctx = NULL;
 697         inc_nlink(inode);
 698
 699         sb->s_root = d_make_root(inode);
 700         if (!sb->s_root)
 701                 return -ENOMEM;
 702         return 0;
 703 }
 704
 705 static const struct super_operations spufs_ops = {
 706         .alloc_inode    = spufs_alloc_inode,
 707         .free_inode     = spufs_free_inode,
 708         .statfs         = simple_statfs,
 709         .evict_inode    = spufs_evict_inode,
 710         .show_options   = spufs_show_options,
 711 };
 712
 713 static int spufs_fill_super(struct super_block *sb, struct fs_context *fc)
 714 {
 715         sb->s_maxbytes = MAX_LFS_FILESIZE;
 716         sb->s_blocksize = PAGE_SIZE;
 717         sb->s_blocksize_bits = PAGE_SHIFT;
 718         sb->s_magic = SPUFS_MAGIC;
 719         sb->s_op = &spufs_ops;
 720
 721         return spufs_create_root(sb, fc);
 722 }
 723
 724 static int spufs_get_tree(struct fs_context *fc)
 725 {
 726         return get_tree_single(fc, spufs_fill_super);
 727 }
 728
 729 static void spufs_free_fc(struct fs_context *fc)
 730 {
 731         kfree(fc->s_fs_info);
 732 }
 733
 734 static const struct fs_context_operations spufs_context_ops = {
 735         .free           = spufs_free_fc,
 736         .parse_param    = spufs_parse_param,
 737         .get_tree       = spufs_get_tree,
 738 };
 739
 740 static int spufs_init_fs_context(struct fs_context *fc)
 741 {
 742         struct spufs_fs_context *ctx;
 743         struct spufs_sb_info *sbi;
 744
 745         ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL);
 746         if (!ctx)
 747                 goto nomem;
 748
 749         sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL);
 750         if (!sbi)
 751                 goto nomem_ctx;
 752
 753         ctx->uid = current_uid();
 754         ctx->gid = current_gid();
 755         ctx->mode = 0755;
 756
 757         fc->fs_private = ctx;
 758         fc->s_fs_info = sbi;
 759         fc->ops = &spufs_context_ops;
 760         return 0;
 761
 762 nomem_ctx:
 763         kfree(ctx);
 764 nomem:
 765         return -ENOMEM;
 766 }
 767
 768 static struct file_system_type spufs_type = {
 769         .owner = THIS_MODULE,
 770         .name = "spufs",
 771         .init_fs_context = spufs_init_fs_context,
 772         .parameters     = spufs_fs_parameters,
 773         .kill_sb = kill_litter_super,
 774 };
 775 MODULE_ALIAS_FS("spufs");
 776
 777 static int __init spufs_init(void)
 778 {
 779         int ret;
 780
 781         ret = -ENODEV;
 782         if (!spu_management_ops)
 783                 goto out;
 784
 785         ret = -ENOMEM;
 786         spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
 787                         sizeof(struct spufs_inode_info), 0,
 788                         SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once);
 789
 790         if (!spufs_inode_cache)
 791                 goto out;
 792         ret = spu_sched_init();
 793         if (ret)
 794                 goto out_cache;
 795         ret = register_spu_syscalls(&spufs_calls);
 796         if (ret)
 797                 goto out_sched;
 798         ret = register_filesystem(&spufs_type);
 799         if (ret)
 800                 goto out_syscalls;
 801
 802         spufs_init_isolated_loader();
 803
 804         return 0;
 805
 806 out_syscalls:
 807         unregister_spu_syscalls(&spufs_calls);
 808 out_sched:
 809         spu_sched_exit();
 810 out_cache:
 811         kmem_cache_destroy(spufs_inode_cache);
 812 out:
 813         return ret;
 814 }
 815 module_init(spufs_init);
 816
 817 static void __exit spufs_exit(void)
 818 {
 819         spu_sched_exit();
 820         spufs_exit_isolated_loader();
 821         unregister_spu_syscalls(&spufs_calls);
 822         unregister_filesystem(&spufs_type);
 823         kmem_cache_destroy(spufs_inode_cache);
 824 }
 825 module_exit(spufs_exit);
 826
 827 MODULE_LICENSE("GPL");
 828 MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
 829