14074Swollman// SPDX-License-Identifier: GPL-2.0-or-later 26399Swollman 34074Swollman/* 46399Swollman * SPU file system 56399Swollman * 66399Swollman * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 76399Swollman * 86399Swollman * Author: Arnd Bergmann <arndb@de.ibm.com> 96399Swollman */ 106399Swollman 116399Swollman#include <linux/file.h> 126399Swollman#include <linux/fs.h> 136399Swollman#include <linux/fs_context.h> 146399Swollman#include <linux/fs_parser.h> 158876Srgrimes#include <linux/fsnotify.h> 166399Swollman#include <linux/backing-dev.h> 176399Swollman#include <linux/init.h> 186399Swollman#include <linux/ioctl.h> 196399Swollman#include <linux/module.h> 206399Swollman#include <linux/mount.h> 216399Swollman#include <linux/namei.h> 226399Swollman#include <linux/pagemap.h> 236399Swollman#include <linux/poll.h> 246399Swollman#include <linux/of.h> 256399Swollman#include <linux/seq_file.h> 266399Swollman#include <linux/slab.h> 276399Swollman 284074Swollman#include <asm/spu.h> 2950477Speter#include <asm/spu_priv1.h> 304074Swollman#include <linux/uaccess.h> 314074Swollman 324074Swollman#include "spufs.h" 334074Swollman 344074Swollmanstruct spufs_sb_info { 354074Swollman bool debug; 364074Swollman}; 374074Swollman 384074Swollmanstatic struct kmem_cache *spufs_inode_cache; 394074Swollmanchar *isolated_loader; 404074Swollmanstatic int isolated_loader_size; 414074Swollman 424074Swollmanstatic struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb) 434074Swollman{ 444074Swollman return sb->s_fs_info; 454074Swollman} 464074Swollman 474074Swollmanstatic struct inode * 4812172Sphkspufs_alloc_inode(struct super_block *sb) 494074Swollman{ 504074Swollman struct spufs_inode_info *ei; 514893Swollman 52120727Ssam ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL); 534074Swollman if (!ei) 544074Swollman return NULL; 554074Swollman 564074Swollman ei->i_gang = NULL; 574074Swollman ei->i_ctx = NULL; 5874454Sru ei->i_openers = 0; 594074Swollman 6092723Salfred return &ei->vfs_inode; 6112579Sbde} 625101Swollman 634074Swollmanstatic void spufs_free_inode(struct inode *inode) 644074Swollman{ 654074Swollman kmem_cache_free(spufs_inode_cache, SPUFS_I(inode)); 664074Swollman} 674074Swollman 684074Swollmanstatic void 694074Swollmanspufs_init_once(void *p) 704074Swollman{ 714074Swollman struct spufs_inode_info *ei = p; 729470Swollman 7313581Sfenner inode_init_once(&ei->vfs_inode); 744074Swollman} 754074Swollman 7615652Swollmanstatic struct inode * 7715652Swollmanspufs_new_inode(struct super_block *sb, umode_t mode) 7815652Swollman{ 7915652Swollman struct inode *inode; 8015652Swollman 8115652Swollman inode = new_inode(sb); 8215652Swollman if (!inode) 8315652Swollman goto out; 8415652Swollman 8515652Swollman inode->i_ino = get_next_ino(); 8615652Swollman inode->i_mode = mode; 8715652Swollman inode->i_uid = current_fsuid(); 88122921Sandre inode->i_gid = current_fsgid(); 8915652Swollman simple_inode_init_ts(inode); 9015652Swollmanout: 9115652Swollman return inode; 9215652Swollman} 93110656Shsu 94110656Shsustatic int 95110656Shsuspufs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 965792Swollman struct iattr *attr) 975792Swollman{ 98122921Sandre struct inode *inode = d_inode(dentry); 99122921Sandre 1004074Swollman if ((attr->ia_valid & ATTR_SIZE) && 101122922Sandre (attr->ia_size != inode->i_size)) 10210881Swollman return -EINVAL; 1039470Swollman setattr_copy(&nop_mnt_idmap, inode, attr); 10413581Sfenner mark_inode_dirty(inode); 10513581Sfenner return 0; 10613581Sfenner} 10713581Sfenner 10813581Sfenner 10913581Sfennerstatic int 11013581Sfennerspufs_new_file(struct super_block *sb, struct dentry *dentry, 11113581Sfenner const struct file_operations *fops, umode_t mode, 112122921Sandre size_t size, struct spu_context *ctx) 11313581Sfenner{ 11413581Sfenner static const struct inode_operations spufs_file_iops = { 115110656Shsu .setattr = spufs_setattr, 116110656Shsu }; 117110656Shsu struct inode *inode; 118121770Ssam int ret; 119121770Ssam 12013581Sfenner ret = -ENOSPC; 121110656Shsu inode = spufs_new_inode(sb, S_IFREG | mode); 122121770Ssam if (!inode) 123121770Ssam goto out; 12413581Sfenner 12513581Sfenner ret = 0; 12674454Sru inode->i_op = &spufs_file_iops; 12713581Sfenner inode->i_fop = fops; 1284074Swollman inode->i_size = size; 1294074Swollman inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx); 1304074Swollman d_add(dentry, inode); 1314105Swollmanout: 1324105Swollman return ret; 1334105Swollman} 1344074Swollman 1354074Swollmanstatic void 1364074Swollmanspufs_evict_inode(struct inode *inode) 1374074Swollman{ 1384074Swollman struct spufs_inode_info *ei = SPUFS_I(inode); 1394074Swollman clear_inode(inode); 1404074Swollman if (ei->i_ctx) 141120727Ssam put_spu_context(ei->i_ctx); 142110656Shsu if (ei->i_gang) 143110656Shsu put_spu_gang(ei->i_gang); 1445101Swollman} 1454105Swollman 1464074Swollmanstatic void spufs_prune_dir(struct dentry *dir) 1474074Swollman{ 1484074Swollman struct dentry *dentry; 1494074Swollman struct hlist_node *n; 1504074Swollman 151110656Shsu inode_lock(d_inode(dir)); 152110656Shsu hlist_for_each_entry_safe(dentry, n, &dir->d_children, d_sib) { 153110656Shsu spin_lock(&dentry->d_lock); 154110656Shsu if (simple_positive(dentry)) { 155110656Shsu dget_dlock(dentry); 156110656Shsu __d_drop(dentry); 157110656Shsu spin_unlock(&dentry->d_lock); 15846381Sbillf simple_unlink(d_inode(dir), dentry); 1594105Swollman /* XXX: what was dcache_lock protecting here? Other 160110656Shsu * filesystems (IB, configfs) release dcache_lock 161110656Shsu * before unlink */ 162110656Shsu dput(dentry); 163110656Shsu } else { 1644074Swollman spin_unlock(&dentry->d_lock); 1655792Swollman } 1664074Swollman } 1674074Swollman shrink_dcache_parent(dir); 1684074Swollman inode_unlock(d_inode(dir)); 1694074Swollman} 1704074Swollman 1714074Swollman/* Caller must hold parent->i_mutex */ 1728876Srgrimesstatic int spufs_rmdir(struct inode *parent, struct dentry *dir) 173120727Ssam{ 174120727Ssam /* remove all entries */ 175110656Shsu int res; 176110656Shsu spufs_prune_dir(dir); 1775792Swollman d_drop(dir); 178110656Shsu res = simple_rmdir(parent, dir); 1794074Swollman /* We have to give up the mm_struct */ 1804074Swollman spu_forget(SPUFS_I(d_inode(dir))->i_ctx); 181110656Shsu return res; 1824105Swollman} 1834074Swollman 1846399Swollmanstatic int spufs_fill_dir(struct dentry *dir, 1856399Swollman const struct spufs_tree_descr *files, umode_t mode, 1866399Swollman struct spu_context *ctx) 1876399Swollman{ 188110656Shsu while (files->name && files->name[0]) { 1896399Swollman int ret; 19034961Sphk struct dentry *dentry = d_alloc_name(dir, files->name); 1916399Swollman if (!dentry) 192121770Ssam return -ENOMEM; 1936399Swollman ret = spufs_new_file(dir->d_sb, dentry, files->ops, 1944074Swollman files->mode & mode, files->size, ctx); 1954074Swollman if (ret) 1964893Swollman return ret; 1974893Swollman files++; 1985101Swollman } 1994893Swollman return 0; 2004893Swollman} 2016400Swollman 2024893Swollmanstatic int spufs_dir_close(struct inode *inode, struct file *file) 2034893Swollman{ 2044893Swollman struct inode *parent; 2054074Swollman struct dentry *dir; 2065101Swollman int ret; 2076400Swollman 2086400Swollman dir = file->f_path.dentry; 2094074Swollman parent = d_inode(dir->d_parent); 2104893Swollman 2114893Swollman inode_lock_nested(parent, I_MUTEX_PARENT); 2124074Swollman ret = spufs_rmdir(parent, dir); 2134893Swollman inode_unlock(parent); 2144893Swollman WARN_ON(ret); 2154893Swollman 2164893Swollman return dcache_dir_close(inode, file); 217110656Shsu} 2184893Swollman 2194893Swollmanconst struct file_operations spufs_context_fops = { 220110656Shsu .open = dcache_dir_open, 221110656Shsu .release = spufs_dir_close, 2227170Sdg .llseek = dcache_dir_lseek, 2234893Swollman .read = generic_read_dir, 2244893Swollman .iterate_shared = dcache_readdir, 2254893Swollman .fsync = noop_fsync, 2264893Swollman}; 2274893SwollmanEXPORT_SYMBOL_GPL(spufs_context_fops); 228110656Shsu 2296568Sdgstatic int 2304893Swollmanspufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, 2314893Swollman umode_t mode) 2324893Swollman{ 2334893Swollman int ret; 234110656Shsu struct inode *inode; 235110656Shsu struct spu_context *ctx; 236110656Shsu 237110656Shsu inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); 238110656Shsu if (!inode) 2396400Swollman return -ENOSPC; 2404893Swollman 2414893Swollman inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR); 2424893Swollman ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */ 2434893Swollman SPUFS_I(inode)->i_ctx = ctx; 2444893Swollman if (!ctx) { 2454893Swollman iput(inode); 2464074Swollman return -ENOSPC; 2474074Swollman } 2486399Swollman 24912296Sphk ctx->flags = flags; 250120727Ssam inode->i_op = &simple_dir_inode_operations; 2515792Swollman inode->i_fop = &simple_dir_operations; 2524074Swollman 2534074Swollman inode_lock(inode); 2544074Swollman 2554893Swollman dget(dentry); 2564893Swollman inc_nlink(dir); 2574893Swollman inc_nlink(inode); 2586399Swollman 2594074Swollman d_instantiate(dentry, inode); 2604893Swollman 2614893Swollman if (flags & SPU_CREATE_NOSCHED) 26234961Sphk ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents, 2636400Swollman mode, ctx); 264108250Shsu else 2654893Swollman ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx); 266108250Shsu 2676399Swollman if (!ret && spufs_get_sb_info(dir->i_sb)->debug) 2686399Swollman ret = spufs_fill_dir(dentry, spufs_dir_debug_contents, 2696399Swollman mode, ctx); 2706399Swollman 2716399Swollman if (ret) 2726399Swollman spufs_rmdir(dir, dentry); 2736399Swollman 2746399Swollman inode_unlock(inode); 2756399Swollman 276110656Shsu return ret; 277110656Shsu} 278110656Shsu 279110656Shsustatic int spufs_context_open(const struct path *path) 280110656Shsu{ 2816399Swollman int ret; 2826399Swollman struct file *filp; 2836399Swollman 28434961Sphk ret = get_unused_fd_flags(0); 28516542Snate if (ret < 0) 2866568Sdg return ret; 2876399Swollman 28816542Snate filp = dentry_open(path, O_RDONLY, current_cred()); 2896399Swollman if (IS_ERR(filp)) { 2906400Swollman put_unused_fd(ret); 291108250Shsu return PTR_ERR(filp); 2926399Swollman } 293108250Shsu 2946399Swollman filp->f_op = &spufs_context_fops; 2956399Swollman fd_install(ret, filp); 2964893Swollman return ret; 29738128Sbde} 298120727Ssam 2994074Swollmanstatic struct spu_context * 3004074Swollmanspufs_assert_affinity(unsigned int flags, struct spu_gang *gang, 30112933Swollman struct file *filp) 3024893Swollman{ 3034893Swollman struct spu_context *tmp, *neighbor, *err; 3045101Swollman int count, node; 3055101Swollman int aff_supp; 306120727Ssam 3075101Swollman aff_supp = !list_empty(&(list_entry(cbe_spu_info[0].spus.next, 3085101Swollman struct spu, cbe_list))->aff_list); 3095101Swollman 3105101Swollman if (!aff_supp) 3116400Swollman return ERR_PTR(-EINVAL); 312108250Shsu 3135101Swollman if (flags & SPU_CREATE_GANG) 314108250Shsu return ERR_PTR(-EINVAL); 3154893Swollman 3164893Swollman if (flags & SPU_CREATE_AFFINITY_MEM && 3174074Swollman gang->aff_ref_ctx && 3184074Swollman gang->aff_ref_ctx->flags & SPU_CREATE_AFFINITY_MEM) 3194074Swollman return ERR_PTR(-EEXIST); 3204074Swollman 3214074Swollman if (gang->aff_flags & AFF_MERGED) 3224074Swollman return ERR_PTR(-EBUSY); 3234074Swollman 3244074Swollman neighbor = NULL; 325110656Shsu if (flags & SPU_CREATE_AFFINITY_SPU) { 3264074Swollman if (!filp || filp->f_op != &spufs_context_fops) 3274074Swollman return ERR_PTR(-EINVAL); 328110656Shsu 3294896Swollman neighbor = get_spu_context( 3304896Swollman SPUFS_I(file_inode(filp))->i_ctx); 3314074Swollman 3324074Swollman if (!list_empty(&neighbor->aff_list) && !(neighbor->aff_head) && 3334074Swollman !list_is_last(&neighbor->aff_list, &gang->aff_list_head) && 3344074Swollman !list_entry(neighbor->aff_list.next, struct spu_context, 335120727Ssam aff_list)->aff_head) { 3364105Swollman err = ERR_PTR(-EEXIST); 3374074Swollman goto out_put_neighbor; 3384074Swollman } 3394074Swollman 34022672Swollman if (gang != neighbor->gang) { 34176469Sru err = ERR_PTR(-EINVAL); 34276469Sru goto out_put_neighbor; 34376469Sru } 34476469Sru 34576469Sru count = 1; 34676469Sru list_for_each_entry(tmp, &gang->aff_list_head, aff_list) 34776469Sru count++; 34822672Swollman if (list_empty(&neighbor->aff_list)) 34922672Swollman count++; 35022672Swollman 35122672Swollman for (node = 0; node < MAX_NUMNODES; node++) { 35276469Sru if ((cbe_spu_info[node].n_spus - atomic_read( 35322672Swollman &cbe_spu_info[node].reserved_spus)) >= count) 35422672Swollman break; 35522672Swollman } 35622672Swollman 35722672Swollman if (node == MAX_NUMNODES) { 35822672Swollman err = ERR_PTR(-EEXIST); 35922672Swollman goto out_put_neighbor; 36022672Swollman } 361121770Ssam } 36276469Sru 36376469Sru return neighbor; 36434914Speter 36534914Speterout_put_neighbor: 36634914Speter put_spu_context(neighbor); 36734914Speter return err; 36834914Speter} 36934914Speter 37034914Speterstatic void 37134914Speterspufs_set_affinity(unsigned int flags, struct spu_context *ctx, 372122921Sandre struct spu_context *neighbor) 373121770Ssam{ 374121929Ssam if (flags & SPU_CREATE_AFFINITY_MEM) 375121929Ssam ctx->gang->aff_ref_ctx = ctx; 37622672Swollman 37722672Swollman if (flags & SPU_CREATE_AFFINITY_SPU) { 37822672Swollman if (list_empty(&neighbor->aff_list)) { 37922672Swollman list_add_tail(&neighbor->aff_list, 38076469Sru &ctx->gang->aff_list_head); 38122672Swollman neighbor->aff_head = 1; 38222672Swollman } 38322672Swollman 38422672Swollman if (list_is_last(&neighbor->aff_list, &ctx->gang->aff_list_head) 38522672Swollman || list_entry(neighbor->aff_list.next, struct spu_context, 38622672Swollman aff_list)->aff_head) { 38722672Swollman list_add(&ctx->aff_list, &neighbor->aff_list); 38822672Swollman } else { 38922672Swollman list_add_tail(&ctx->aff_list, &neighbor->aff_list); 39076469Sru if (neighbor->aff_head) { 391108250Shsu neighbor->aff_head = 0; 39222672Swollman ctx->aff_head = 1; 393108250Shsu } 394120727Ssam } 39522672Swollman 39622672Swollman if (!ctx->gang->aff_ref_ctx) 397 ctx->gang->aff_ref_ctx = ctx; 398 } 399} 400 401static int 402spufs_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 453out_aff_unlock: 454 if (affinity) 455 mutex_unlock(&gang->aff_mutex); 456 return ret; 457} 458 459static int 460spufs_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 inode_init_owner(&nop_mnt_idmap, inode, dir, mode | S_IFDIR); 473 gang = alloc_spu_gang(); 474 SPUFS_I(inode)->i_ctx = NULL; 475 SPUFS_I(inode)->i_gang = gang; 476 if (!gang) { 477 ret = -ENOMEM; 478 goto out_iput; 479 } 480 481 inode->i_op = &simple_dir_inode_operations; 482 inode->i_fop = &simple_dir_operations; 483 484 d_instantiate(dentry, inode); 485 inc_nlink(dir); 486 inc_nlink(d_inode(dentry)); 487 return ret; 488 489out_iput: 490 iput(inode); 491out: 492 return ret; 493} 494 495static int spufs_gang_open(const struct path *path) 496{ 497 int ret; 498 struct file *filp; 499 500 ret = get_unused_fd_flags(0); 501 if (ret < 0) 502 return ret; 503 504 /* 505 * get references for dget and mntget, will be released 506 * in error path of *_open(). 507 */ 508 filp = dentry_open(path, O_RDONLY, current_cred()); 509 if (IS_ERR(filp)) { 510 put_unused_fd(ret); 511 return PTR_ERR(filp); 512 } 513 514 filp->f_op = &simple_dir_operations; 515 fd_install(ret, filp); 516 return ret; 517} 518 519static int spufs_create_gang(struct inode *inode, 520 struct dentry *dentry, 521 struct vfsmount *mnt, umode_t mode) 522{ 523 struct path path = {.mnt = mnt, .dentry = dentry}; 524 int ret; 525 526 ret = spufs_mkgang(inode, dentry, mode & 0777); 527 if (!ret) { 528 ret = spufs_gang_open(&path); 529 if (ret < 0) { 530 int err = simple_rmdir(inode, dentry); 531 WARN_ON(err); 532 } 533 } 534 return ret; 535} 536 537 538static struct file_system_type spufs_type; 539 540long spufs_create(const struct path *path, struct dentry *dentry, 541 unsigned int flags, umode_t mode, struct file *filp) 542{ 543 struct inode *dir = d_inode(path->dentry); 544 int ret; 545 546 /* check if we are on spufs */ 547 if (path->dentry->d_sb->s_type != &spufs_type) 548 return -EINVAL; 549 550 /* don't accept undefined flags */ 551 if (flags & (~SPU_CREATE_FLAG_ALL)) 552 return -EINVAL; 553 554 /* only threads can be underneath a gang */ 555 if (path->dentry != path->dentry->d_sb->s_root) 556 if ((flags & SPU_CREATE_GANG) || !SPUFS_I(dir)->i_gang) 557 return -EINVAL; 558 559 mode &= ~current_umask(); 560 561 if (flags & SPU_CREATE_GANG) 562 ret = spufs_create_gang(dir, dentry, path->mnt, mode); 563 else 564 ret = spufs_create_context(dir, dentry, path->mnt, flags, mode, 565 filp); 566 if (ret >= 0) 567 fsnotify_mkdir(dir, dentry); 568 569 return ret; 570} 571 572/* File system initialization */ 573struct spufs_fs_context { 574 kuid_t uid; 575 kgid_t gid; 576 umode_t mode; 577}; 578 579enum { 580 Opt_uid, Opt_gid, Opt_mode, Opt_debug, 581}; 582 583static const struct fs_parameter_spec spufs_fs_parameters[] = { 584 fsparam_u32 ("gid", Opt_gid), 585 fsparam_u32oct ("mode", Opt_mode), 586 fsparam_u32 ("uid", Opt_uid), 587 fsparam_flag ("debug", Opt_debug), 588 {} 589}; 590 591static int spufs_show_options(struct seq_file *m, struct dentry *root) 592{ 593 struct spufs_sb_info *sbi = spufs_get_sb_info(root->d_sb); 594 struct inode *inode = root->d_inode; 595 596 if (!uid_eq(inode->i_uid, GLOBAL_ROOT_UID)) 597 seq_printf(m, ",uid=%u", 598 from_kuid_munged(&init_user_ns, inode->i_uid)); 599 if (!gid_eq(inode->i_gid, GLOBAL_ROOT_GID)) 600 seq_printf(m, ",gid=%u", 601 from_kgid_munged(&init_user_ns, inode->i_gid)); 602 if ((inode->i_mode & S_IALLUGO) != 0775) 603 seq_printf(m, ",mode=%o", inode->i_mode); 604 if (sbi->debug) 605 seq_puts(m, ",debug"); 606 return 0; 607} 608 609static int spufs_parse_param(struct fs_context *fc, struct fs_parameter *param) 610{ 611 struct spufs_fs_context *ctx = fc->fs_private; 612 struct spufs_sb_info *sbi = fc->s_fs_info; 613 struct fs_parse_result result; 614 kuid_t uid; 615 kgid_t gid; 616 int opt; 617 618 opt = fs_parse(fc, spufs_fs_parameters, param, &result); 619 if (opt < 0) 620 return opt; 621 622 switch (opt) { 623 case Opt_uid: 624 uid = make_kuid(current_user_ns(), result.uint_32); 625 if (!uid_valid(uid)) 626 return invalf(fc, "Unknown uid"); 627 ctx->uid = uid; 628 break; 629 case Opt_gid: 630 gid = make_kgid(current_user_ns(), result.uint_32); 631 if (!gid_valid(gid)) 632 return invalf(fc, "Unknown gid"); 633 ctx->gid = gid; 634 break; 635 case Opt_mode: 636 ctx->mode = result.uint_32 & S_IALLUGO; 637 break; 638 case Opt_debug: 639 sbi->debug = true; 640 break; 641 } 642 643 return 0; 644} 645 646static void spufs_exit_isolated_loader(void) 647{ 648 free_pages((unsigned long) isolated_loader, 649 get_order(isolated_loader_size)); 650} 651 652static void __init 653spufs_init_isolated_loader(void) 654{ 655 struct device_node *dn; 656 const char *loader; 657 int size; 658 659 dn = of_find_node_by_path("/spu-isolation"); 660 if (!dn) 661 return; 662 663 loader = of_get_property(dn, "loader", &size); 664 of_node_put(dn); 665 if (!loader) 666 return; 667 668 /* the loader must be align on a 16 byte boundary */ 669 isolated_loader = (char *)__get_free_pages(GFP_KERNEL, get_order(size)); 670 if (!isolated_loader) 671 return; 672 673 isolated_loader_size = size; 674 memcpy(isolated_loader, loader, size); 675 printk(KERN_INFO "spufs: SPU isolation mode enabled\n"); 676} 677 678static int spufs_create_root(struct super_block *sb, struct fs_context *fc) 679{ 680 struct spufs_fs_context *ctx = fc->fs_private; 681 struct inode *inode; 682 683 if (!spu_management_ops) 684 return -ENODEV; 685 686 inode = spufs_new_inode(sb, S_IFDIR | ctx->mode); 687 if (!inode) 688 return -ENOMEM; 689 690 inode->i_uid = ctx->uid; 691 inode->i_gid = ctx->gid; 692 inode->i_op = &simple_dir_inode_operations; 693 inode->i_fop = &simple_dir_operations; 694 SPUFS_I(inode)->i_ctx = NULL; 695 inc_nlink(inode); 696 697 sb->s_root = d_make_root(inode); 698 if (!sb->s_root) 699 return -ENOMEM; 700 return 0; 701} 702 703static const struct super_operations spufs_ops = { 704 .alloc_inode = spufs_alloc_inode, 705 .free_inode = spufs_free_inode, 706 .statfs = simple_statfs, 707 .evict_inode = spufs_evict_inode, 708 .show_options = spufs_show_options, 709}; 710 711static int spufs_fill_super(struct super_block *sb, struct fs_context *fc) 712{ 713 sb->s_maxbytes = MAX_LFS_FILESIZE; 714 sb->s_blocksize = PAGE_SIZE; 715 sb->s_blocksize_bits = PAGE_SHIFT; 716 sb->s_magic = SPUFS_MAGIC; 717 sb->s_op = &spufs_ops; 718 719 return spufs_create_root(sb, fc); 720} 721 722static int spufs_get_tree(struct fs_context *fc) 723{ 724 return get_tree_single(fc, spufs_fill_super); 725} 726 727static void spufs_free_fc(struct fs_context *fc) 728{ 729 kfree(fc->s_fs_info); 730} 731 732static const struct fs_context_operations spufs_context_ops = { 733 .free = spufs_free_fc, 734 .parse_param = spufs_parse_param, 735 .get_tree = spufs_get_tree, 736}; 737 738static int spufs_init_fs_context(struct fs_context *fc) 739{ 740 struct spufs_fs_context *ctx; 741 struct spufs_sb_info *sbi; 742 743 ctx = kzalloc(sizeof(struct spufs_fs_context), GFP_KERNEL); 744 if (!ctx) 745 goto nomem; 746 747 sbi = kzalloc(sizeof(struct spufs_sb_info), GFP_KERNEL); 748 if (!sbi) 749 goto nomem_ctx; 750 751 ctx->uid = current_uid(); 752 ctx->gid = current_gid(); 753 ctx->mode = 0755; 754 755 fc->fs_private = ctx; 756 fc->s_fs_info = sbi; 757 fc->ops = &spufs_context_ops; 758 return 0; 759 760nomem_ctx: 761 kfree(ctx); 762nomem: 763 return -ENOMEM; 764} 765 766static struct file_system_type spufs_type = { 767 .owner = THIS_MODULE, 768 .name = "spufs", 769 .init_fs_context = spufs_init_fs_context, 770 .parameters = spufs_fs_parameters, 771 .kill_sb = kill_litter_super, 772}; 773MODULE_ALIAS_FS("spufs"); 774 775static int __init spufs_init(void) 776{ 777 int ret; 778 779 ret = -ENODEV; 780 if (!spu_management_ops) 781 goto out; 782 783 ret = -ENOMEM; 784 spufs_inode_cache = kmem_cache_create("spufs_inode_cache", 785 sizeof(struct spufs_inode_info), 0, 786 SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, spufs_init_once); 787 788 if (!spufs_inode_cache) 789 goto out; 790 ret = spu_sched_init(); 791 if (ret) 792 goto out_cache; 793 ret = register_spu_syscalls(&spufs_calls); 794 if (ret) 795 goto out_sched; 796 ret = register_filesystem(&spufs_type); 797 if (ret) 798 goto out_syscalls; 799 800 spufs_init_isolated_loader(); 801 802 return 0; 803 804out_syscalls: 805 unregister_spu_syscalls(&spufs_calls); 806out_sched: 807 spu_sched_exit(); 808out_cache: 809 kmem_cache_destroy(spufs_inode_cache); 810out: 811 return ret; 812} 813module_init(spufs_init); 814 815static void __exit spufs_exit(void) 816{ 817 spu_sched_exit(); 818 spufs_exit_isolated_loader(); 819 unregister_spu_syscalls(&spufs_calls); 820 unregister_filesystem(&spufs_type); 821 kmem_cache_destroy(spufs_inode_cache); 822} 823module_exit(spufs_exit); 824 825MODULE_LICENSE("GPL"); 826MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); 827 828