167207b96SArnd Bergmann /* 267207b96SArnd Bergmann * SPU file system 367207b96SArnd Bergmann * 467207b96SArnd Bergmann * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 567207b96SArnd Bergmann * 667207b96SArnd Bergmann * Author: Arnd Bergmann <arndb@de.ibm.com> 767207b96SArnd Bergmann * 867207b96SArnd Bergmann * This program is free software; you can redistribute it and/or modify 967207b96SArnd Bergmann * it under the terms of the GNU General Public License as published by 1067207b96SArnd Bergmann * the Free Software Foundation; either version 2, or (at your option) 1167207b96SArnd Bergmann * any later version. 1267207b96SArnd Bergmann * 1367207b96SArnd Bergmann * This program is distributed in the hope that it will be useful, 1467207b96SArnd Bergmann * but WITHOUT ANY WARRANTY; without even the implied warranty of 1567207b96SArnd Bergmann * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1667207b96SArnd Bergmann * GNU General Public License for more details. 1767207b96SArnd Bergmann * 1867207b96SArnd Bergmann * You should have received a copy of the GNU General Public License 1967207b96SArnd Bergmann * along with this program; if not, write to the Free Software 2067207b96SArnd Bergmann * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 2167207b96SArnd Bergmann */ 2267207b96SArnd Bergmann 2367207b96SArnd Bergmann #include <linux/file.h> 2467207b96SArnd Bergmann #include <linux/fs.h> 2567207b96SArnd Bergmann #include <linux/backing-dev.h> 2667207b96SArnd Bergmann #include <linux/init.h> 2767207b96SArnd Bergmann #include <linux/ioctl.h> 2867207b96SArnd Bergmann #include <linux/module.h> 29346f4d3cSArnd Bergmann #include <linux/mount.h> 3067207b96SArnd Bergmann #include <linux/namei.h> 3167207b96SArnd Bergmann #include <linux/pagemap.h> 3267207b96SArnd Bergmann #include <linux/poll.h> 3367207b96SArnd Bergmann #include <linux/slab.h> 3467207b96SArnd Bergmann #include <linux/parser.h> 3567207b96SArnd Bergmann 360afacde3Sarnd@arndb.de #include <asm/prom.h> 3767207b96SArnd Bergmann #include <asm/semaphore.h> 3867207b96SArnd Bergmann #include <asm/spu.h> 3967207b96SArnd Bergmann #include <asm/uaccess.h> 4067207b96SArnd Bergmann 4167207b96SArnd Bergmann #include "spufs.h" 4267207b96SArnd Bergmann 43e18b890bSChristoph Lameter static struct kmem_cache *spufs_inode_cache; 44c6730ed4SJeremy Kerr char *isolated_loader; 4567207b96SArnd Bergmann 4667207b96SArnd Bergmann static struct inode * 4767207b96SArnd Bergmann spufs_alloc_inode(struct super_block *sb) 4867207b96SArnd Bergmann { 4967207b96SArnd Bergmann struct spufs_inode_info *ei; 5067207b96SArnd Bergmann 51e94b1766SChristoph Lameter ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL); 5267207b96SArnd Bergmann if (!ei) 5367207b96SArnd Bergmann return NULL; 546263203eSArnd Bergmann 556263203eSArnd Bergmann ei->i_gang = NULL; 566263203eSArnd Bergmann ei->i_ctx = NULL; 5743c2bbd9SChristoph Hellwig ei->i_openers = 0; 586263203eSArnd Bergmann 5967207b96SArnd Bergmann return &ei->vfs_inode; 6067207b96SArnd Bergmann } 6167207b96SArnd Bergmann 6267207b96SArnd Bergmann static void 6367207b96SArnd Bergmann spufs_destroy_inode(struct inode *inode) 6467207b96SArnd Bergmann { 6567207b96SArnd Bergmann kmem_cache_free(spufs_inode_cache, SPUFS_I(inode)); 6667207b96SArnd Bergmann } 6767207b96SArnd Bergmann 6867207b96SArnd Bergmann static void 69e18b890bSChristoph Lameter spufs_init_once(void *p, struct kmem_cache * cachep, unsigned long flags) 7067207b96SArnd Bergmann { 7167207b96SArnd Bergmann struct spufs_inode_info *ei = p; 7267207b96SArnd Bergmann 7367207b96SArnd Bergmann if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 7467207b96SArnd Bergmann SLAB_CTOR_CONSTRUCTOR) { 7567207b96SArnd Bergmann inode_init_once(&ei->vfs_inode); 7667207b96SArnd Bergmann } 7767207b96SArnd Bergmann } 7867207b96SArnd Bergmann 7967207b96SArnd Bergmann static struct inode * 8067207b96SArnd Bergmann spufs_new_inode(struct super_block *sb, int mode) 8167207b96SArnd Bergmann { 8267207b96SArnd Bergmann struct inode *inode; 8367207b96SArnd Bergmann 8467207b96SArnd Bergmann inode = new_inode(sb); 8567207b96SArnd Bergmann if (!inode) 8667207b96SArnd Bergmann goto out; 8767207b96SArnd Bergmann 8867207b96SArnd Bergmann inode->i_mode = mode; 8967207b96SArnd Bergmann inode->i_uid = current->fsuid; 9067207b96SArnd Bergmann inode->i_gid = current->fsgid; 9167207b96SArnd Bergmann inode->i_blocks = 0; 9267207b96SArnd Bergmann inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 9367207b96SArnd Bergmann out: 9467207b96SArnd Bergmann return inode; 9567207b96SArnd Bergmann } 9667207b96SArnd Bergmann 9767207b96SArnd Bergmann static int 9867207b96SArnd Bergmann spufs_setattr(struct dentry *dentry, struct iattr *attr) 9967207b96SArnd Bergmann { 10067207b96SArnd Bergmann struct inode *inode = dentry->d_inode; 10167207b96SArnd Bergmann 10267207b96SArnd Bergmann if ((attr->ia_valid & ATTR_SIZE) && 10367207b96SArnd Bergmann (attr->ia_size != inode->i_size)) 10467207b96SArnd Bergmann return -EINVAL; 10567207b96SArnd Bergmann return inode_setattr(inode, attr); 10667207b96SArnd Bergmann } 10767207b96SArnd Bergmann 10867207b96SArnd Bergmann 10967207b96SArnd Bergmann static int 11067207b96SArnd Bergmann spufs_new_file(struct super_block *sb, struct dentry *dentry, 11199ac48f5SArjan van de Ven const struct file_operations *fops, int mode, 11267207b96SArnd Bergmann struct spu_context *ctx) 11367207b96SArnd Bergmann { 11467207b96SArnd Bergmann static struct inode_operations spufs_file_iops = { 11567207b96SArnd Bergmann .setattr = spufs_setattr, 11667207b96SArnd Bergmann }; 11767207b96SArnd Bergmann struct inode *inode; 11867207b96SArnd Bergmann int ret; 11967207b96SArnd Bergmann 12067207b96SArnd Bergmann ret = -ENOSPC; 12167207b96SArnd Bergmann inode = spufs_new_inode(sb, S_IFREG | mode); 12267207b96SArnd Bergmann if (!inode) 12367207b96SArnd Bergmann goto out; 12467207b96SArnd Bergmann 12567207b96SArnd Bergmann ret = 0; 12667207b96SArnd Bergmann inode->i_op = &spufs_file_iops; 12767207b96SArnd Bergmann inode->i_fop = fops; 1288e18e294STheodore Ts'o inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx); 12967207b96SArnd Bergmann d_add(dentry, inode); 13067207b96SArnd Bergmann out: 13167207b96SArnd Bergmann return ret; 13267207b96SArnd Bergmann } 13367207b96SArnd Bergmann 13467207b96SArnd Bergmann static void 13567207b96SArnd Bergmann spufs_delete_inode(struct inode *inode) 13667207b96SArnd Bergmann { 1376263203eSArnd Bergmann struct spufs_inode_info *ei = SPUFS_I(inode); 1386263203eSArnd Bergmann 1396263203eSArnd Bergmann if (ei->i_ctx) 1406263203eSArnd Bergmann put_spu_context(ei->i_ctx); 1416263203eSArnd Bergmann if (ei->i_gang) 1426263203eSArnd Bergmann put_spu_gang(ei->i_gang); 14367207b96SArnd Bergmann clear_inode(inode); 14467207b96SArnd Bergmann } 14567207b96SArnd Bergmann 1463f51dd91SArnd Bergmann static void spufs_prune_dir(struct dentry *dir) 1473f51dd91SArnd Bergmann { 1483f51dd91SArnd Bergmann struct dentry *dentry, *tmp; 1496263203eSArnd Bergmann 1501b1dcc1bSJes Sorensen mutex_lock(&dir->d_inode->i_mutex); 151c3a9aea7SAndrew Morton list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { 1523f51dd91SArnd Bergmann spin_lock(&dcache_lock); 1533f51dd91SArnd Bergmann spin_lock(&dentry->d_lock); 1543f51dd91SArnd Bergmann if (!(d_unhashed(dentry)) && dentry->d_inode) { 1553f51dd91SArnd Bergmann dget_locked(dentry); 1563f51dd91SArnd Bergmann __d_drop(dentry); 1573f51dd91SArnd Bergmann spin_unlock(&dentry->d_lock); 1583f51dd91SArnd Bergmann simple_unlink(dir->d_inode, dentry); 1593f51dd91SArnd Bergmann spin_unlock(&dcache_lock); 1603f51dd91SArnd Bergmann dput(dentry); 1613f51dd91SArnd Bergmann } else { 1623f51dd91SArnd Bergmann spin_unlock(&dentry->d_lock); 1633f51dd91SArnd Bergmann spin_unlock(&dcache_lock); 1643f51dd91SArnd Bergmann } 1653f51dd91SArnd Bergmann } 1663f51dd91SArnd Bergmann shrink_dcache_parent(dir); 1671b1dcc1bSJes Sorensen mutex_unlock(&dir->d_inode->i_mutex); 1683f51dd91SArnd Bergmann } 1693f51dd91SArnd Bergmann 1706263203eSArnd Bergmann /* Caller must hold parent->i_mutex */ 1716263203eSArnd Bergmann static int spufs_rmdir(struct inode *parent, struct dentry *dir) 1723f51dd91SArnd Bergmann { 1733f51dd91SArnd Bergmann /* remove all entries */ 1746263203eSArnd Bergmann spufs_prune_dir(dir); 1753f51dd91SArnd Bergmann 1766263203eSArnd Bergmann return simple_rmdir(parent, dir); 1773f51dd91SArnd Bergmann } 1783f51dd91SArnd Bergmann 1793f51dd91SArnd Bergmann static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files, 18067207b96SArnd Bergmann int mode, struct spu_context *ctx) 18167207b96SArnd Bergmann { 18267207b96SArnd Bergmann struct dentry *dentry; 18367207b96SArnd Bergmann int ret; 18467207b96SArnd Bergmann 18567207b96SArnd Bergmann while (files->name && files->name[0]) { 18667207b96SArnd Bergmann ret = -ENOMEM; 18767207b96SArnd Bergmann dentry = d_alloc_name(dir, files->name); 18867207b96SArnd Bergmann if (!dentry) 18967207b96SArnd Bergmann goto out; 19067207b96SArnd Bergmann ret = spufs_new_file(dir->d_sb, dentry, files->ops, 19167207b96SArnd Bergmann files->mode & mode, ctx); 19267207b96SArnd Bergmann if (ret) 19367207b96SArnd Bergmann goto out; 19467207b96SArnd Bergmann files++; 19567207b96SArnd Bergmann } 19667207b96SArnd Bergmann return 0; 19767207b96SArnd Bergmann out: 1983f51dd91SArnd Bergmann spufs_prune_dir(dir); 19967207b96SArnd Bergmann return ret; 20067207b96SArnd Bergmann } 20167207b96SArnd Bergmann 20267207b96SArnd Bergmann static int spufs_dir_close(struct inode *inode, struct file *file) 20367207b96SArnd Bergmann { 2040309f02dSMichael Ellerman struct spu_context *ctx; 2056263203eSArnd Bergmann struct inode *parent; 2066263203eSArnd Bergmann struct dentry *dir; 20767207b96SArnd Bergmann int ret; 20867207b96SArnd Bergmann 209b4d1ab58SJosef Sipek dir = file->f_path.dentry; 2106263203eSArnd Bergmann parent = dir->d_parent->d_inode; 2116263203eSArnd Bergmann ctx = SPUFS_I(dir->d_inode)->i_ctx; 212c8ca0633SArnd Bergmann 2136263203eSArnd Bergmann mutex_lock(&parent->i_mutex); 2146263203eSArnd Bergmann ret = spufs_rmdir(parent, dir); 2156263203eSArnd Bergmann mutex_unlock(&parent->i_mutex); 21667207b96SArnd Bergmann WARN_ON(ret); 217c8ca0633SArnd Bergmann 2180309f02dSMichael Ellerman /* We have to give up the mm_struct */ 2190309f02dSMichael Ellerman spu_forget(ctx); 2200309f02dSMichael Ellerman 22167207b96SArnd Bergmann return dcache_dir_close(inode, file); 22267207b96SArnd Bergmann } 22367207b96SArnd Bergmann 224754661f1SArjan van de Ven const struct inode_operations spufs_dir_inode_operations = { 22567207b96SArnd Bergmann .lookup = simple_lookup, 22667207b96SArnd Bergmann }; 22767207b96SArnd Bergmann 2285dfe4c96SArjan van de Ven const struct file_operations spufs_context_fops = { 22967207b96SArnd Bergmann .open = dcache_dir_open, 23067207b96SArnd Bergmann .release = spufs_dir_close, 23167207b96SArnd Bergmann .llseek = dcache_dir_lseek, 23267207b96SArnd Bergmann .read = generic_read_dir, 23367207b96SArnd Bergmann .readdir = dcache_readdir, 23467207b96SArnd Bergmann .fsync = simple_sync_file, 23567207b96SArnd Bergmann }; 236bf1ab978SDwayne Grant McConnell EXPORT_SYMBOL_GPL(spufs_context_fops); 23767207b96SArnd Bergmann 23867207b96SArnd Bergmann static int 2399add11daSArnd Bergmann spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, 2409add11daSArnd Bergmann int mode) 24167207b96SArnd Bergmann { 24267207b96SArnd Bergmann int ret; 24367207b96SArnd Bergmann struct inode *inode; 24467207b96SArnd Bergmann struct spu_context *ctx; 24567207b96SArnd Bergmann 24667207b96SArnd Bergmann ret = -ENOSPC; 24767207b96SArnd Bergmann inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); 24867207b96SArnd Bergmann if (!inode) 24967207b96SArnd Bergmann goto out; 25067207b96SArnd Bergmann 25167207b96SArnd Bergmann if (dir->i_mode & S_ISGID) { 25267207b96SArnd Bergmann inode->i_gid = dir->i_gid; 25367207b96SArnd Bergmann inode->i_mode &= S_ISGID; 25467207b96SArnd Bergmann } 2556263203eSArnd Bergmann ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */ 25667207b96SArnd Bergmann SPUFS_I(inode)->i_ctx = ctx; 25767207b96SArnd Bergmann if (!ctx) 25867207b96SArnd Bergmann goto out_iput; 25967207b96SArnd Bergmann 2609add11daSArnd Bergmann ctx->flags = flags; 26167207b96SArnd Bergmann inode->i_op = &spufs_dir_inode_operations; 26267207b96SArnd Bergmann inode->i_fop = &simple_dir_operations; 2635737edd1SMark Nutter if (flags & SPU_CREATE_NOSCHED) 2645737edd1SMark Nutter ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents, 2655737edd1SMark Nutter mode, ctx); 2665737edd1SMark Nutter else 26767207b96SArnd Bergmann ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx); 2685737edd1SMark Nutter 26967207b96SArnd Bergmann if (ret) 27067207b96SArnd Bergmann goto out_free_ctx; 27167207b96SArnd Bergmann 27267207b96SArnd Bergmann d_instantiate(dentry, inode); 27367207b96SArnd Bergmann dget(dentry); 27467207b96SArnd Bergmann dir->i_nlink++; 275346f4d3cSArnd Bergmann dentry->d_inode->i_nlink++; 27667207b96SArnd Bergmann goto out; 27767207b96SArnd Bergmann 27867207b96SArnd Bergmann out_free_ctx: 27967207b96SArnd Bergmann put_spu_context(ctx); 28067207b96SArnd Bergmann out_iput: 28167207b96SArnd Bergmann iput(inode); 28267207b96SArnd Bergmann out: 28367207b96SArnd Bergmann return ret; 28467207b96SArnd Bergmann } 28567207b96SArnd Bergmann 286346f4d3cSArnd Bergmann static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt) 287346f4d3cSArnd Bergmann { 288346f4d3cSArnd Bergmann int ret; 289346f4d3cSArnd Bergmann struct file *filp; 290346f4d3cSArnd Bergmann 291346f4d3cSArnd Bergmann ret = get_unused_fd(); 292346f4d3cSArnd Bergmann if (ret < 0) { 293346f4d3cSArnd Bergmann dput(dentry); 294346f4d3cSArnd Bergmann mntput(mnt); 295346f4d3cSArnd Bergmann goto out; 296346f4d3cSArnd Bergmann } 297346f4d3cSArnd Bergmann 298346f4d3cSArnd Bergmann filp = dentry_open(dentry, mnt, O_RDONLY); 299346f4d3cSArnd Bergmann if (IS_ERR(filp)) { 300346f4d3cSArnd Bergmann put_unused_fd(ret); 301346f4d3cSArnd Bergmann ret = PTR_ERR(filp); 302346f4d3cSArnd Bergmann goto out; 303346f4d3cSArnd Bergmann } 304346f4d3cSArnd Bergmann 305346f4d3cSArnd Bergmann filp->f_op = &spufs_context_fops; 306346f4d3cSArnd Bergmann fd_install(ret, filp); 307346f4d3cSArnd Bergmann out: 308346f4d3cSArnd Bergmann return ret; 309346f4d3cSArnd Bergmann } 310346f4d3cSArnd Bergmann 3116263203eSArnd Bergmann static int spufs_create_context(struct inode *inode, 3126263203eSArnd Bergmann struct dentry *dentry, 3136263203eSArnd Bergmann struct vfsmount *mnt, int flags, int mode) 3146263203eSArnd Bergmann { 3156263203eSArnd Bergmann int ret; 3166263203eSArnd Bergmann 3175737edd1SMark Nutter ret = -EPERM; 3185737edd1SMark Nutter if ((flags & SPU_CREATE_NOSCHED) && 3195737edd1SMark Nutter !capable(CAP_SYS_NICE)) 3205737edd1SMark Nutter goto out_unlock; 3215737edd1SMark Nutter 3225737edd1SMark Nutter ret = -EINVAL; 3235737edd1SMark Nutter if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE)) 3245737edd1SMark Nutter == SPU_CREATE_ISOLATE) 3255737edd1SMark Nutter goto out_unlock; 3265737edd1SMark Nutter 327bd2e5f82SJeremy Kerr ret = -ENODEV; 328bd2e5f82SJeremy Kerr if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader) 329bd2e5f82SJeremy Kerr goto out_unlock; 330bd2e5f82SJeremy Kerr 3316263203eSArnd Bergmann ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO); 3326263203eSArnd Bergmann if (ret) 3336263203eSArnd Bergmann goto out_unlock; 3346263203eSArnd Bergmann 3356263203eSArnd Bergmann /* 3366263203eSArnd Bergmann * get references for dget and mntget, will be released 3376263203eSArnd Bergmann * in error path of *_open(). 3386263203eSArnd Bergmann */ 3396263203eSArnd Bergmann ret = spufs_context_open(dget(dentry), mntget(mnt)); 3406263203eSArnd Bergmann if (ret < 0) { 3416263203eSArnd Bergmann WARN_ON(spufs_rmdir(inode, dentry)); 3426263203eSArnd Bergmann mutex_unlock(&inode->i_mutex); 3436263203eSArnd Bergmann spu_forget(SPUFS_I(dentry->d_inode)->i_ctx); 3446263203eSArnd Bergmann goto out; 3456263203eSArnd Bergmann } 3466263203eSArnd Bergmann 3476263203eSArnd Bergmann out_unlock: 3486263203eSArnd Bergmann mutex_unlock(&inode->i_mutex); 3496263203eSArnd Bergmann out: 3506263203eSArnd Bergmann dput(dentry); 3516263203eSArnd Bergmann return ret; 3526263203eSArnd Bergmann } 3536263203eSArnd Bergmann 3546263203eSArnd Bergmann static int spufs_rmgang(struct inode *root, struct dentry *dir) 3556263203eSArnd Bergmann { 3566263203eSArnd Bergmann /* FIXME: this fails if the dir is not empty, 3576263203eSArnd Bergmann which causes a leak of gangs. */ 3586263203eSArnd Bergmann return simple_rmdir(root, dir); 3596263203eSArnd Bergmann } 3606263203eSArnd Bergmann 3616263203eSArnd Bergmann static int spufs_gang_close(struct inode *inode, struct file *file) 3626263203eSArnd Bergmann { 3636263203eSArnd Bergmann struct inode *parent; 3646263203eSArnd Bergmann struct dentry *dir; 3656263203eSArnd Bergmann int ret; 3666263203eSArnd Bergmann 367b4d1ab58SJosef Sipek dir = file->f_path.dentry; 3686263203eSArnd Bergmann parent = dir->d_parent->d_inode; 3696263203eSArnd Bergmann 3706263203eSArnd Bergmann ret = spufs_rmgang(parent, dir); 3716263203eSArnd Bergmann WARN_ON(ret); 3726263203eSArnd Bergmann 3736263203eSArnd Bergmann return dcache_dir_close(inode, file); 3746263203eSArnd Bergmann } 3756263203eSArnd Bergmann 3765dfe4c96SArjan van de Ven const struct file_operations spufs_gang_fops = { 3776263203eSArnd Bergmann .open = dcache_dir_open, 3786263203eSArnd Bergmann .release = spufs_gang_close, 3796263203eSArnd Bergmann .llseek = dcache_dir_lseek, 3806263203eSArnd Bergmann .read = generic_read_dir, 3816263203eSArnd Bergmann .readdir = dcache_readdir, 3826263203eSArnd Bergmann .fsync = simple_sync_file, 3836263203eSArnd Bergmann }; 3846263203eSArnd Bergmann 3856263203eSArnd Bergmann static int 3866263203eSArnd Bergmann spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode) 3876263203eSArnd Bergmann { 3886263203eSArnd Bergmann int ret; 3896263203eSArnd Bergmann struct inode *inode; 3906263203eSArnd Bergmann struct spu_gang *gang; 3916263203eSArnd Bergmann 3926263203eSArnd Bergmann ret = -ENOSPC; 3936263203eSArnd Bergmann inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); 3946263203eSArnd Bergmann if (!inode) 3956263203eSArnd Bergmann goto out; 3966263203eSArnd Bergmann 3976263203eSArnd Bergmann ret = 0; 3986263203eSArnd Bergmann if (dir->i_mode & S_ISGID) { 3996263203eSArnd Bergmann inode->i_gid = dir->i_gid; 4006263203eSArnd Bergmann inode->i_mode &= S_ISGID; 4016263203eSArnd Bergmann } 4026263203eSArnd Bergmann gang = alloc_spu_gang(); 4036263203eSArnd Bergmann SPUFS_I(inode)->i_ctx = NULL; 4046263203eSArnd Bergmann SPUFS_I(inode)->i_gang = gang; 4056263203eSArnd Bergmann if (!gang) 4066263203eSArnd Bergmann goto out_iput; 4076263203eSArnd Bergmann 4086263203eSArnd Bergmann inode->i_op = &spufs_dir_inode_operations; 4096263203eSArnd Bergmann inode->i_fop = &simple_dir_operations; 4106263203eSArnd Bergmann 4116263203eSArnd Bergmann d_instantiate(dentry, inode); 4126263203eSArnd Bergmann dget(dentry); 4136263203eSArnd Bergmann dir->i_nlink++; 4146263203eSArnd Bergmann dentry->d_inode->i_nlink++; 4156263203eSArnd Bergmann return ret; 4166263203eSArnd Bergmann 4176263203eSArnd Bergmann out_iput: 4186263203eSArnd Bergmann iput(inode); 4196263203eSArnd Bergmann out: 4206263203eSArnd Bergmann return ret; 4216263203eSArnd Bergmann } 4226263203eSArnd Bergmann 4236263203eSArnd Bergmann static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt) 4246263203eSArnd Bergmann { 4256263203eSArnd Bergmann int ret; 4266263203eSArnd Bergmann struct file *filp; 4276263203eSArnd Bergmann 4286263203eSArnd Bergmann ret = get_unused_fd(); 4296263203eSArnd Bergmann if (ret < 0) { 4306263203eSArnd Bergmann dput(dentry); 4316263203eSArnd Bergmann mntput(mnt); 4326263203eSArnd Bergmann goto out; 4336263203eSArnd Bergmann } 4346263203eSArnd Bergmann 4356263203eSArnd Bergmann filp = dentry_open(dentry, mnt, O_RDONLY); 4366263203eSArnd Bergmann if (IS_ERR(filp)) { 4376263203eSArnd Bergmann put_unused_fd(ret); 4386263203eSArnd Bergmann ret = PTR_ERR(filp); 4396263203eSArnd Bergmann goto out; 4406263203eSArnd Bergmann } 4416263203eSArnd Bergmann 4426263203eSArnd Bergmann filp->f_op = &spufs_gang_fops; 4436263203eSArnd Bergmann fd_install(ret, filp); 4446263203eSArnd Bergmann out: 4456263203eSArnd Bergmann return ret; 4466263203eSArnd Bergmann } 4476263203eSArnd Bergmann 4486263203eSArnd Bergmann static int spufs_create_gang(struct inode *inode, 4496263203eSArnd Bergmann struct dentry *dentry, 4506263203eSArnd Bergmann struct vfsmount *mnt, int mode) 4516263203eSArnd Bergmann { 4526263203eSArnd Bergmann int ret; 4536263203eSArnd Bergmann 4546263203eSArnd Bergmann ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO); 4556263203eSArnd Bergmann if (ret) 4566263203eSArnd Bergmann goto out; 4576263203eSArnd Bergmann 4586263203eSArnd Bergmann /* 4596263203eSArnd Bergmann * get references for dget and mntget, will be released 4606263203eSArnd Bergmann * in error path of *_open(). 4616263203eSArnd Bergmann */ 4626263203eSArnd Bergmann ret = spufs_gang_open(dget(dentry), mntget(mnt)); 4636263203eSArnd Bergmann if (ret < 0) 4646263203eSArnd Bergmann WARN_ON(spufs_rmgang(inode, dentry)); 4656263203eSArnd Bergmann 4666263203eSArnd Bergmann out: 4676263203eSArnd Bergmann mutex_unlock(&inode->i_mutex); 4686263203eSArnd Bergmann dput(dentry); 4696263203eSArnd Bergmann return ret; 4706263203eSArnd Bergmann } 4716263203eSArnd Bergmann 4726263203eSArnd Bergmann 473346f4d3cSArnd Bergmann static struct file_system_type spufs_type; 474346f4d3cSArnd Bergmann 4756263203eSArnd Bergmann long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode) 47667207b96SArnd Bergmann { 47767207b96SArnd Bergmann struct dentry *dentry; 47867207b96SArnd Bergmann int ret; 47967207b96SArnd Bergmann 48067207b96SArnd Bergmann ret = -EINVAL; 4816263203eSArnd Bergmann /* check if we are on spufs */ 4826263203eSArnd Bergmann if (nd->dentry->d_sb->s_type != &spufs_type) 48367207b96SArnd Bergmann goto out; 48467207b96SArnd Bergmann 4856263203eSArnd Bergmann /* don't accept undefined flags */ 4869add11daSArnd Bergmann if (flags & (~SPU_CREATE_FLAG_ALL)) 487c9832948Sarnd@arndb.de goto out; 488c9832948Sarnd@arndb.de 4896263203eSArnd Bergmann /* only threads can be underneath a gang */ 4906263203eSArnd Bergmann if (nd->dentry != nd->dentry->d_sb->s_root) { 4916263203eSArnd Bergmann if ((flags & SPU_CREATE_GANG) || 4926263203eSArnd Bergmann !SPUFS_I(nd->dentry->d_inode)->i_gang) 4936263203eSArnd Bergmann goto out; 4946263203eSArnd Bergmann } 4956263203eSArnd Bergmann 49667207b96SArnd Bergmann dentry = lookup_create(nd, 1); 49767207b96SArnd Bergmann ret = PTR_ERR(dentry); 49867207b96SArnd Bergmann if (IS_ERR(dentry)) 49967207b96SArnd Bergmann goto out_dir; 50067207b96SArnd Bergmann 50167207b96SArnd Bergmann ret = -EEXIST; 50267207b96SArnd Bergmann if (dentry->d_inode) 50367207b96SArnd Bergmann goto out_dput; 50467207b96SArnd Bergmann 50567207b96SArnd Bergmann mode &= ~current->fs->umask; 50667207b96SArnd Bergmann 5076263203eSArnd Bergmann if (flags & SPU_CREATE_GANG) 5086263203eSArnd Bergmann return spufs_create_gang(nd->dentry->d_inode, 5096263203eSArnd Bergmann dentry, nd->mnt, mode); 5106263203eSArnd Bergmann else 5116263203eSArnd Bergmann return spufs_create_context(nd->dentry->d_inode, 5126263203eSArnd Bergmann dentry, nd->mnt, flags, mode); 51367207b96SArnd Bergmann 51467207b96SArnd Bergmann out_dput: 51567207b96SArnd Bergmann dput(dentry); 51667207b96SArnd Bergmann out_dir: 5171b1dcc1bSJes Sorensen mutex_unlock(&nd->dentry->d_inode->i_mutex); 51867207b96SArnd Bergmann out: 51967207b96SArnd Bergmann return ret; 52067207b96SArnd Bergmann } 52167207b96SArnd Bergmann 52267207b96SArnd Bergmann /* File system initialization */ 52367207b96SArnd Bergmann enum { 52467207b96SArnd Bergmann Opt_uid, Opt_gid, Opt_err, 52567207b96SArnd Bergmann }; 52667207b96SArnd Bergmann 52767207b96SArnd Bergmann static match_table_t spufs_tokens = { 52867207b96SArnd Bergmann { Opt_uid, "uid=%d" }, 52967207b96SArnd Bergmann { Opt_gid, "gid=%d" }, 53067207b96SArnd Bergmann { Opt_err, NULL }, 53167207b96SArnd Bergmann }; 53267207b96SArnd Bergmann 53367207b96SArnd Bergmann static int 53467207b96SArnd Bergmann spufs_parse_options(char *options, struct inode *root) 53567207b96SArnd Bergmann { 53667207b96SArnd Bergmann char *p; 53767207b96SArnd Bergmann substring_t args[MAX_OPT_ARGS]; 53867207b96SArnd Bergmann 53967207b96SArnd Bergmann while ((p = strsep(&options, ",")) != NULL) { 54067207b96SArnd Bergmann int token, option; 54167207b96SArnd Bergmann 54267207b96SArnd Bergmann if (!*p) 54367207b96SArnd Bergmann continue; 54467207b96SArnd Bergmann 54567207b96SArnd Bergmann token = match_token(p, spufs_tokens, args); 54667207b96SArnd Bergmann switch (token) { 54767207b96SArnd Bergmann case Opt_uid: 54867207b96SArnd Bergmann if (match_int(&args[0], &option)) 54967207b96SArnd Bergmann return 0; 55067207b96SArnd Bergmann root->i_uid = option; 55167207b96SArnd Bergmann break; 55267207b96SArnd Bergmann case Opt_gid: 55367207b96SArnd Bergmann if (match_int(&args[0], &option)) 55467207b96SArnd Bergmann return 0; 55567207b96SArnd Bergmann root->i_gid = option; 55667207b96SArnd Bergmann break; 55767207b96SArnd Bergmann default: 55867207b96SArnd Bergmann return 0; 55967207b96SArnd Bergmann } 56067207b96SArnd Bergmann } 56167207b96SArnd Bergmann return 1; 56267207b96SArnd Bergmann } 56367207b96SArnd Bergmann 5640afacde3Sarnd@arndb.de static void 5650afacde3Sarnd@arndb.de spufs_init_isolated_loader(void) 5660afacde3Sarnd@arndb.de { 5670afacde3Sarnd@arndb.de struct device_node *dn; 5680afacde3Sarnd@arndb.de const char *loader; 5690afacde3Sarnd@arndb.de int size; 5700afacde3Sarnd@arndb.de 5710afacde3Sarnd@arndb.de dn = of_find_node_by_path("/spu-isolation"); 5720afacde3Sarnd@arndb.de if (!dn) 5730afacde3Sarnd@arndb.de return; 5740afacde3Sarnd@arndb.de 575e2eb6392SStephen Rothwell loader = of_get_property(dn, "loader", &size); 5760afacde3Sarnd@arndb.de if (!loader) 5770afacde3Sarnd@arndb.de return; 5780afacde3Sarnd@arndb.de 5790afacde3Sarnd@arndb.de /* kmalloc should align on a 16 byte boundary..* */ 5800afacde3Sarnd@arndb.de isolated_loader = kmalloc(size, GFP_KERNEL); 5810afacde3Sarnd@arndb.de if (!isolated_loader) 5820afacde3Sarnd@arndb.de return; 5830afacde3Sarnd@arndb.de 5840afacde3Sarnd@arndb.de memcpy(isolated_loader, loader, size); 5850afacde3Sarnd@arndb.de printk(KERN_INFO "spufs: SPU isolation mode enabled\n"); 5860afacde3Sarnd@arndb.de } 5870afacde3Sarnd@arndb.de 58867207b96SArnd Bergmann static int 5898b3d6663SArnd Bergmann spufs_create_root(struct super_block *sb, void *data) 5908b3d6663SArnd Bergmann { 59167207b96SArnd Bergmann struct inode *inode; 59267207b96SArnd Bergmann int ret; 59367207b96SArnd Bergmann 59467207b96SArnd Bergmann ret = -ENOMEM; 59567207b96SArnd Bergmann inode = spufs_new_inode(sb, S_IFDIR | 0775); 59667207b96SArnd Bergmann if (!inode) 59767207b96SArnd Bergmann goto out; 59867207b96SArnd Bergmann 59967207b96SArnd Bergmann inode->i_op = &spufs_dir_inode_operations; 60067207b96SArnd Bergmann inode->i_fop = &simple_dir_operations; 60167207b96SArnd Bergmann SPUFS_I(inode)->i_ctx = NULL; 60267207b96SArnd Bergmann 60367207b96SArnd Bergmann ret = -EINVAL; 60467207b96SArnd Bergmann if (!spufs_parse_options(data, inode)) 60567207b96SArnd Bergmann goto out_iput; 60667207b96SArnd Bergmann 60767207b96SArnd Bergmann ret = -ENOMEM; 60867207b96SArnd Bergmann sb->s_root = d_alloc_root(inode); 60967207b96SArnd Bergmann if (!sb->s_root) 61067207b96SArnd Bergmann goto out_iput; 61167207b96SArnd Bergmann 61267207b96SArnd Bergmann return 0; 61367207b96SArnd Bergmann out_iput: 61467207b96SArnd Bergmann iput(inode); 61567207b96SArnd Bergmann out: 61667207b96SArnd Bergmann return ret; 61767207b96SArnd Bergmann } 61867207b96SArnd Bergmann 61967207b96SArnd Bergmann static int 62067207b96SArnd Bergmann spufs_fill_super(struct super_block *sb, void *data, int silent) 62167207b96SArnd Bergmann { 62267207b96SArnd Bergmann static struct super_operations s_ops = { 62367207b96SArnd Bergmann .alloc_inode = spufs_alloc_inode, 62467207b96SArnd Bergmann .destroy_inode = spufs_destroy_inode, 62567207b96SArnd Bergmann .statfs = simple_statfs, 62667207b96SArnd Bergmann .delete_inode = spufs_delete_inode, 62767207b96SArnd Bergmann .drop_inode = generic_delete_inode, 62867207b96SArnd Bergmann }; 62967207b96SArnd Bergmann 63067207b96SArnd Bergmann sb->s_maxbytes = MAX_LFS_FILESIZE; 63167207b96SArnd Bergmann sb->s_blocksize = PAGE_CACHE_SIZE; 63267207b96SArnd Bergmann sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 63367207b96SArnd Bergmann sb->s_magic = SPUFS_MAGIC; 63467207b96SArnd Bergmann sb->s_op = &s_ops; 63567207b96SArnd Bergmann 63667207b96SArnd Bergmann return spufs_create_root(sb, data); 63767207b96SArnd Bergmann } 63867207b96SArnd Bergmann 639454e2398SDavid Howells static int 64067207b96SArnd Bergmann spufs_get_sb(struct file_system_type *fstype, int flags, 641454e2398SDavid Howells const char *name, void *data, struct vfsmount *mnt) 64267207b96SArnd Bergmann { 643454e2398SDavid Howells return get_sb_single(fstype, flags, data, spufs_fill_super, mnt); 64467207b96SArnd Bergmann } 64567207b96SArnd Bergmann 64667207b96SArnd Bergmann static struct file_system_type spufs_type = { 64767207b96SArnd Bergmann .owner = THIS_MODULE, 64867207b96SArnd Bergmann .name = "spufs", 64967207b96SArnd Bergmann .get_sb = spufs_get_sb, 65067207b96SArnd Bergmann .kill_sb = kill_litter_super, 65167207b96SArnd Bergmann }; 65267207b96SArnd Bergmann 653e78b47a5SArnd Bergmann static int __init spufs_init(void) 65467207b96SArnd Bergmann { 65567207b96SArnd Bergmann int ret; 656bf1ab978SDwayne Grant McConnell 65767207b96SArnd Bergmann ret = -ENOMEM; 65867207b96SArnd Bergmann spufs_inode_cache = kmem_cache_create("spufs_inode_cache", 65967207b96SArnd Bergmann sizeof(struct spufs_inode_info), 0, 66067207b96SArnd Bergmann SLAB_HWCACHE_ALIGN, spufs_init_once, NULL); 66167207b96SArnd Bergmann 66267207b96SArnd Bergmann if (!spufs_inode_cache) 66367207b96SArnd Bergmann goto out; 664*c99c1994SAkinobu Mita ret = spu_sched_init(); 66567207b96SArnd Bergmann if (ret) 66667207b96SArnd Bergmann goto out_cache; 667*c99c1994SAkinobu Mita ret = register_filesystem(&spufs_type); 668*c99c1994SAkinobu Mita if (ret) 669*c99c1994SAkinobu Mita goto out_sched; 67067207b96SArnd Bergmann ret = register_spu_syscalls(&spufs_calls); 67167207b96SArnd Bergmann if (ret) 67267207b96SArnd Bergmann goto out_fs; 673bf1ab978SDwayne Grant McConnell ret = register_arch_coredump_calls(&spufs_coredump_calls); 674bf1ab978SDwayne Grant McConnell if (ret) 675*c99c1994SAkinobu Mita goto out_syscalls; 6760afacde3Sarnd@arndb.de 6770afacde3Sarnd@arndb.de spufs_init_isolated_loader(); 678bf1ab978SDwayne Grant McConnell 67967207b96SArnd Bergmann return 0; 680*c99c1994SAkinobu Mita 681*c99c1994SAkinobu Mita out_syscalls: 682*c99c1994SAkinobu Mita unregister_spu_syscalls(&spufs_calls); 68367207b96SArnd Bergmann out_fs: 68467207b96SArnd Bergmann unregister_filesystem(&spufs_type); 685*c99c1994SAkinobu Mita out_sched: 686*c99c1994SAkinobu Mita spu_sched_exit(); 68767207b96SArnd Bergmann out_cache: 68867207b96SArnd Bergmann kmem_cache_destroy(spufs_inode_cache); 68967207b96SArnd Bergmann out: 69067207b96SArnd Bergmann return ret; 69167207b96SArnd Bergmann } 69267207b96SArnd Bergmann module_init(spufs_init); 69367207b96SArnd Bergmann 694e78b47a5SArnd Bergmann static void __exit spufs_exit(void) 69567207b96SArnd Bergmann { 6968b3d6663SArnd Bergmann spu_sched_exit(); 697bf1ab978SDwayne Grant McConnell unregister_arch_coredump_calls(&spufs_coredump_calls); 69867207b96SArnd Bergmann unregister_spu_syscalls(&spufs_calls); 69967207b96SArnd Bergmann unregister_filesystem(&spufs_type); 70067207b96SArnd Bergmann kmem_cache_destroy(spufs_inode_cache); 70167207b96SArnd Bergmann } 70267207b96SArnd Bergmann module_exit(spufs_exit); 70367207b96SArnd Bergmann 70467207b96SArnd Bergmann MODULE_LICENSE("GPL"); 70567207b96SArnd Bergmann MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); 70667207b96SArnd Bergmann 707