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 3667207b96SArnd Bergmann #include <asm/io.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 4367207b96SArnd Bergmann static kmem_cache_t *spufs_inode_cache; 4467207b96SArnd Bergmann 4567207b96SArnd Bergmann static struct inode * 4667207b96SArnd Bergmann spufs_alloc_inode(struct super_block *sb) 4767207b96SArnd Bergmann { 4867207b96SArnd Bergmann struct spufs_inode_info *ei; 4967207b96SArnd Bergmann 5067207b96SArnd Bergmann ei = kmem_cache_alloc(spufs_inode_cache, SLAB_KERNEL); 5167207b96SArnd Bergmann if (!ei) 5267207b96SArnd Bergmann return NULL; 536263203eSArnd Bergmann 546263203eSArnd Bergmann ei->i_gang = NULL; 556263203eSArnd Bergmann ei->i_ctx = NULL; 566263203eSArnd Bergmann 5767207b96SArnd Bergmann return &ei->vfs_inode; 5867207b96SArnd Bergmann } 5967207b96SArnd Bergmann 6067207b96SArnd Bergmann static void 6167207b96SArnd Bergmann spufs_destroy_inode(struct inode *inode) 6267207b96SArnd Bergmann { 6367207b96SArnd Bergmann kmem_cache_free(spufs_inode_cache, SPUFS_I(inode)); 6467207b96SArnd Bergmann } 6567207b96SArnd Bergmann 6667207b96SArnd Bergmann static void 6767207b96SArnd Bergmann spufs_init_once(void *p, kmem_cache_t * cachep, unsigned long flags) 6867207b96SArnd Bergmann { 6967207b96SArnd Bergmann struct spufs_inode_info *ei = p; 7067207b96SArnd Bergmann 7167207b96SArnd Bergmann if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 7267207b96SArnd Bergmann SLAB_CTOR_CONSTRUCTOR) { 7367207b96SArnd Bergmann inode_init_once(&ei->vfs_inode); 7467207b96SArnd Bergmann } 7567207b96SArnd Bergmann } 7667207b96SArnd Bergmann 7767207b96SArnd Bergmann static struct inode * 7867207b96SArnd Bergmann spufs_new_inode(struct super_block *sb, int mode) 7967207b96SArnd Bergmann { 8067207b96SArnd Bergmann struct inode *inode; 8167207b96SArnd Bergmann 8267207b96SArnd Bergmann inode = new_inode(sb); 8367207b96SArnd Bergmann if (!inode) 8467207b96SArnd Bergmann goto out; 8567207b96SArnd Bergmann 8667207b96SArnd Bergmann inode->i_mode = mode; 8767207b96SArnd Bergmann inode->i_uid = current->fsuid; 8867207b96SArnd Bergmann inode->i_gid = current->fsgid; 8967207b96SArnd Bergmann inode->i_blocks = 0; 9067207b96SArnd Bergmann inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 9167207b96SArnd Bergmann out: 9267207b96SArnd Bergmann return inode; 9367207b96SArnd Bergmann } 9467207b96SArnd Bergmann 9567207b96SArnd Bergmann static int 9667207b96SArnd Bergmann spufs_setattr(struct dentry *dentry, struct iattr *attr) 9767207b96SArnd Bergmann { 9867207b96SArnd Bergmann struct inode *inode = dentry->d_inode; 9967207b96SArnd Bergmann 10067207b96SArnd Bergmann if ((attr->ia_valid & ATTR_SIZE) && 10167207b96SArnd Bergmann (attr->ia_size != inode->i_size)) 10267207b96SArnd Bergmann return -EINVAL; 10367207b96SArnd Bergmann return inode_setattr(inode, attr); 10467207b96SArnd Bergmann } 10567207b96SArnd Bergmann 10667207b96SArnd Bergmann 10767207b96SArnd Bergmann static int 10867207b96SArnd Bergmann spufs_new_file(struct super_block *sb, struct dentry *dentry, 10999ac48f5SArjan van de Ven const struct file_operations *fops, int mode, 11067207b96SArnd Bergmann struct spu_context *ctx) 11167207b96SArnd Bergmann { 11267207b96SArnd Bergmann static struct inode_operations spufs_file_iops = { 11367207b96SArnd Bergmann .setattr = spufs_setattr, 11467207b96SArnd Bergmann }; 11567207b96SArnd Bergmann struct inode *inode; 11667207b96SArnd Bergmann int ret; 11767207b96SArnd Bergmann 11867207b96SArnd Bergmann ret = -ENOSPC; 11967207b96SArnd Bergmann inode = spufs_new_inode(sb, S_IFREG | mode); 12067207b96SArnd Bergmann if (!inode) 12167207b96SArnd Bergmann goto out; 12267207b96SArnd Bergmann 12367207b96SArnd Bergmann ret = 0; 12467207b96SArnd Bergmann inode->i_op = &spufs_file_iops; 12567207b96SArnd Bergmann inode->i_fop = fops; 1268e18e294STheodore Ts'o inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx); 12767207b96SArnd Bergmann d_add(dentry, inode); 12867207b96SArnd Bergmann out: 12967207b96SArnd Bergmann return ret; 13067207b96SArnd Bergmann } 13167207b96SArnd Bergmann 13267207b96SArnd Bergmann static void 13367207b96SArnd Bergmann spufs_delete_inode(struct inode *inode) 13467207b96SArnd Bergmann { 1356263203eSArnd Bergmann struct spufs_inode_info *ei = SPUFS_I(inode); 1366263203eSArnd Bergmann 1376263203eSArnd Bergmann if (ei->i_ctx) 1386263203eSArnd Bergmann put_spu_context(ei->i_ctx); 1396263203eSArnd Bergmann if (ei->i_gang) 1406263203eSArnd Bergmann put_spu_gang(ei->i_gang); 14167207b96SArnd Bergmann clear_inode(inode); 14267207b96SArnd Bergmann } 14367207b96SArnd Bergmann 1443f51dd91SArnd Bergmann static void spufs_prune_dir(struct dentry *dir) 1453f51dd91SArnd Bergmann { 1463f51dd91SArnd Bergmann struct dentry *dentry, *tmp; 1476263203eSArnd Bergmann 1481b1dcc1bSJes Sorensen mutex_lock(&dir->d_inode->i_mutex); 149c3a9aea7SAndrew Morton list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) { 1503f51dd91SArnd Bergmann spin_lock(&dcache_lock); 1513f51dd91SArnd Bergmann spin_lock(&dentry->d_lock); 1523f51dd91SArnd Bergmann if (!(d_unhashed(dentry)) && dentry->d_inode) { 1533f51dd91SArnd Bergmann dget_locked(dentry); 1543f51dd91SArnd Bergmann __d_drop(dentry); 1553f51dd91SArnd Bergmann spin_unlock(&dentry->d_lock); 1563f51dd91SArnd Bergmann simple_unlink(dir->d_inode, dentry); 1573f51dd91SArnd Bergmann spin_unlock(&dcache_lock); 1583f51dd91SArnd Bergmann dput(dentry); 1593f51dd91SArnd Bergmann } else { 1603f51dd91SArnd Bergmann spin_unlock(&dentry->d_lock); 1613f51dd91SArnd Bergmann spin_unlock(&dcache_lock); 1623f51dd91SArnd Bergmann } 1633f51dd91SArnd Bergmann } 1643f51dd91SArnd Bergmann shrink_dcache_parent(dir); 1651b1dcc1bSJes Sorensen mutex_unlock(&dir->d_inode->i_mutex); 1663f51dd91SArnd Bergmann } 1673f51dd91SArnd Bergmann 1686263203eSArnd Bergmann /* Caller must hold parent->i_mutex */ 1696263203eSArnd Bergmann static int spufs_rmdir(struct inode *parent, struct dentry *dir) 1703f51dd91SArnd Bergmann { 1713f51dd91SArnd Bergmann /* remove all entries */ 1726263203eSArnd Bergmann spufs_prune_dir(dir); 1733f51dd91SArnd Bergmann 1746263203eSArnd Bergmann return simple_rmdir(parent, dir); 1753f51dd91SArnd Bergmann } 1763f51dd91SArnd Bergmann 1773f51dd91SArnd Bergmann static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files, 17867207b96SArnd Bergmann int mode, struct spu_context *ctx) 17967207b96SArnd Bergmann { 18067207b96SArnd Bergmann struct dentry *dentry; 18167207b96SArnd Bergmann int ret; 18267207b96SArnd Bergmann 18367207b96SArnd Bergmann while (files->name && files->name[0]) { 18467207b96SArnd Bergmann ret = -ENOMEM; 18567207b96SArnd Bergmann dentry = d_alloc_name(dir, files->name); 18667207b96SArnd Bergmann if (!dentry) 18767207b96SArnd Bergmann goto out; 18867207b96SArnd Bergmann ret = spufs_new_file(dir->d_sb, dentry, files->ops, 18967207b96SArnd Bergmann files->mode & mode, ctx); 19067207b96SArnd Bergmann if (ret) 19167207b96SArnd Bergmann goto out; 19267207b96SArnd Bergmann files++; 19367207b96SArnd Bergmann } 19467207b96SArnd Bergmann return 0; 19567207b96SArnd Bergmann out: 1963f51dd91SArnd Bergmann spufs_prune_dir(dir); 19767207b96SArnd Bergmann return ret; 19867207b96SArnd Bergmann } 19967207b96SArnd Bergmann 20067207b96SArnd Bergmann static int spufs_dir_close(struct inode *inode, struct file *file) 20167207b96SArnd Bergmann { 2020309f02dSMichael Ellerman struct spu_context *ctx; 2036263203eSArnd Bergmann struct inode *parent; 2046263203eSArnd Bergmann struct dentry *dir; 20567207b96SArnd Bergmann int ret; 20667207b96SArnd Bergmann 2076263203eSArnd Bergmann dir = file->f_dentry; 2086263203eSArnd Bergmann parent = dir->d_parent->d_inode; 2096263203eSArnd Bergmann ctx = SPUFS_I(dir->d_inode)->i_ctx; 210c8ca0633SArnd Bergmann 2116263203eSArnd Bergmann mutex_lock(&parent->i_mutex); 2126263203eSArnd Bergmann ret = spufs_rmdir(parent, dir); 2136263203eSArnd Bergmann mutex_unlock(&parent->i_mutex); 21467207b96SArnd Bergmann WARN_ON(ret); 215c8ca0633SArnd Bergmann 2160309f02dSMichael Ellerman /* We have to give up the mm_struct */ 2170309f02dSMichael Ellerman spu_forget(ctx); 2180309f02dSMichael Ellerman 21967207b96SArnd Bergmann return dcache_dir_close(inode, file); 22067207b96SArnd Bergmann } 22167207b96SArnd Bergmann 22267207b96SArnd Bergmann struct inode_operations spufs_dir_inode_operations = { 22367207b96SArnd Bergmann .lookup = simple_lookup, 22467207b96SArnd Bergmann }; 22567207b96SArnd Bergmann 226e80358adSArnd Bergmann struct file_operations spufs_context_fops = { 22767207b96SArnd Bergmann .open = dcache_dir_open, 22867207b96SArnd Bergmann .release = spufs_dir_close, 22967207b96SArnd Bergmann .llseek = dcache_dir_lseek, 23067207b96SArnd Bergmann .read = generic_read_dir, 23167207b96SArnd Bergmann .readdir = dcache_readdir, 23267207b96SArnd Bergmann .fsync = simple_sync_file, 23367207b96SArnd Bergmann }; 23467207b96SArnd Bergmann 23567207b96SArnd Bergmann static int 2369add11daSArnd Bergmann spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, 2379add11daSArnd Bergmann int mode) 23867207b96SArnd Bergmann { 23967207b96SArnd Bergmann int ret; 24067207b96SArnd Bergmann struct inode *inode; 24167207b96SArnd Bergmann struct spu_context *ctx; 24267207b96SArnd Bergmann 24367207b96SArnd Bergmann ret = -ENOSPC; 24467207b96SArnd Bergmann inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); 24567207b96SArnd Bergmann if (!inode) 24667207b96SArnd Bergmann goto out; 24767207b96SArnd Bergmann 24867207b96SArnd Bergmann if (dir->i_mode & S_ISGID) { 24967207b96SArnd Bergmann inode->i_gid = dir->i_gid; 25067207b96SArnd Bergmann inode->i_mode &= S_ISGID; 25167207b96SArnd Bergmann } 2526263203eSArnd Bergmann ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */ 25367207b96SArnd Bergmann SPUFS_I(inode)->i_ctx = ctx; 25467207b96SArnd Bergmann if (!ctx) 25567207b96SArnd Bergmann goto out_iput; 25667207b96SArnd Bergmann 2579add11daSArnd Bergmann ctx->flags = flags; 2589add11daSArnd Bergmann 25967207b96SArnd Bergmann inode->i_op = &spufs_dir_inode_operations; 26067207b96SArnd Bergmann inode->i_fop = &simple_dir_operations; 261*5737edd1SMark Nutter if (flags & SPU_CREATE_NOSCHED) 262*5737edd1SMark Nutter ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents, 263*5737edd1SMark Nutter mode, ctx); 264*5737edd1SMark Nutter else 26567207b96SArnd Bergmann ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx); 266*5737edd1SMark Nutter 26767207b96SArnd Bergmann if (ret) 26867207b96SArnd Bergmann goto out_free_ctx; 26967207b96SArnd Bergmann 27067207b96SArnd Bergmann d_instantiate(dentry, inode); 27167207b96SArnd Bergmann dget(dentry); 27267207b96SArnd Bergmann dir->i_nlink++; 273346f4d3cSArnd Bergmann dentry->d_inode->i_nlink++; 27467207b96SArnd Bergmann goto out; 27567207b96SArnd Bergmann 27667207b96SArnd Bergmann out_free_ctx: 27767207b96SArnd Bergmann put_spu_context(ctx); 27867207b96SArnd Bergmann out_iput: 27967207b96SArnd Bergmann iput(inode); 28067207b96SArnd Bergmann out: 28167207b96SArnd Bergmann return ret; 28267207b96SArnd Bergmann } 28367207b96SArnd Bergmann 284346f4d3cSArnd Bergmann static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt) 285346f4d3cSArnd Bergmann { 286346f4d3cSArnd Bergmann int ret; 287346f4d3cSArnd Bergmann struct file *filp; 288346f4d3cSArnd Bergmann 289346f4d3cSArnd Bergmann ret = get_unused_fd(); 290346f4d3cSArnd Bergmann if (ret < 0) { 291346f4d3cSArnd Bergmann dput(dentry); 292346f4d3cSArnd Bergmann mntput(mnt); 293346f4d3cSArnd Bergmann goto out; 294346f4d3cSArnd Bergmann } 295346f4d3cSArnd Bergmann 296346f4d3cSArnd Bergmann filp = dentry_open(dentry, mnt, O_RDONLY); 297346f4d3cSArnd Bergmann if (IS_ERR(filp)) { 298346f4d3cSArnd Bergmann put_unused_fd(ret); 299346f4d3cSArnd Bergmann ret = PTR_ERR(filp); 300346f4d3cSArnd Bergmann goto out; 301346f4d3cSArnd Bergmann } 302346f4d3cSArnd Bergmann 303346f4d3cSArnd Bergmann filp->f_op = &spufs_context_fops; 304346f4d3cSArnd Bergmann fd_install(ret, filp); 305346f4d3cSArnd Bergmann out: 306346f4d3cSArnd Bergmann return ret; 307346f4d3cSArnd Bergmann } 308346f4d3cSArnd Bergmann 3096263203eSArnd Bergmann static int spufs_create_context(struct inode *inode, 3106263203eSArnd Bergmann struct dentry *dentry, 3116263203eSArnd Bergmann struct vfsmount *mnt, int flags, int mode) 3126263203eSArnd Bergmann { 3136263203eSArnd Bergmann int ret; 3146263203eSArnd Bergmann 315*5737edd1SMark Nutter ret = -EPERM; 316*5737edd1SMark Nutter if ((flags & SPU_CREATE_NOSCHED) && 317*5737edd1SMark Nutter !capable(CAP_SYS_NICE)) 318*5737edd1SMark Nutter goto out_unlock; 319*5737edd1SMark Nutter 320*5737edd1SMark Nutter ret = -EINVAL; 321*5737edd1SMark Nutter if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE)) 322*5737edd1SMark Nutter == SPU_CREATE_ISOLATE) 323*5737edd1SMark Nutter goto out_unlock; 324*5737edd1SMark Nutter 3256263203eSArnd Bergmann ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO); 3266263203eSArnd Bergmann if (ret) 3276263203eSArnd Bergmann goto out_unlock; 3286263203eSArnd Bergmann 3296263203eSArnd Bergmann /* 3306263203eSArnd Bergmann * get references for dget and mntget, will be released 3316263203eSArnd Bergmann * in error path of *_open(). 3326263203eSArnd Bergmann */ 3336263203eSArnd Bergmann ret = spufs_context_open(dget(dentry), mntget(mnt)); 3346263203eSArnd Bergmann if (ret < 0) { 3356263203eSArnd Bergmann WARN_ON(spufs_rmdir(inode, dentry)); 3366263203eSArnd Bergmann mutex_unlock(&inode->i_mutex); 3376263203eSArnd Bergmann spu_forget(SPUFS_I(dentry->d_inode)->i_ctx); 3386263203eSArnd Bergmann goto out; 3396263203eSArnd Bergmann } 3406263203eSArnd Bergmann 3416263203eSArnd Bergmann out_unlock: 3426263203eSArnd Bergmann mutex_unlock(&inode->i_mutex); 3436263203eSArnd Bergmann out: 3446263203eSArnd Bergmann dput(dentry); 3456263203eSArnd Bergmann return ret; 3466263203eSArnd Bergmann } 3476263203eSArnd Bergmann 3486263203eSArnd Bergmann static int spufs_rmgang(struct inode *root, struct dentry *dir) 3496263203eSArnd Bergmann { 3506263203eSArnd Bergmann /* FIXME: this fails if the dir is not empty, 3516263203eSArnd Bergmann which causes a leak of gangs. */ 3526263203eSArnd Bergmann return simple_rmdir(root, dir); 3536263203eSArnd Bergmann } 3546263203eSArnd Bergmann 3556263203eSArnd Bergmann static int spufs_gang_close(struct inode *inode, struct file *file) 3566263203eSArnd Bergmann { 3576263203eSArnd Bergmann struct inode *parent; 3586263203eSArnd Bergmann struct dentry *dir; 3596263203eSArnd Bergmann int ret; 3606263203eSArnd Bergmann 3616263203eSArnd Bergmann dir = file->f_dentry; 3626263203eSArnd Bergmann parent = dir->d_parent->d_inode; 3636263203eSArnd Bergmann 3646263203eSArnd Bergmann ret = spufs_rmgang(parent, dir); 3656263203eSArnd Bergmann WARN_ON(ret); 3666263203eSArnd Bergmann 3676263203eSArnd Bergmann return dcache_dir_close(inode, file); 3686263203eSArnd Bergmann } 3696263203eSArnd Bergmann 3706263203eSArnd Bergmann struct file_operations spufs_gang_fops = { 3716263203eSArnd Bergmann .open = dcache_dir_open, 3726263203eSArnd Bergmann .release = spufs_gang_close, 3736263203eSArnd Bergmann .llseek = dcache_dir_lseek, 3746263203eSArnd Bergmann .read = generic_read_dir, 3756263203eSArnd Bergmann .readdir = dcache_readdir, 3766263203eSArnd Bergmann .fsync = simple_sync_file, 3776263203eSArnd Bergmann }; 3786263203eSArnd Bergmann 3796263203eSArnd Bergmann static int 3806263203eSArnd Bergmann spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode) 3816263203eSArnd Bergmann { 3826263203eSArnd Bergmann int ret; 3836263203eSArnd Bergmann struct inode *inode; 3846263203eSArnd Bergmann struct spu_gang *gang; 3856263203eSArnd Bergmann 3866263203eSArnd Bergmann ret = -ENOSPC; 3876263203eSArnd Bergmann inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR); 3886263203eSArnd Bergmann if (!inode) 3896263203eSArnd Bergmann goto out; 3906263203eSArnd Bergmann 3916263203eSArnd Bergmann ret = 0; 3926263203eSArnd Bergmann if (dir->i_mode & S_ISGID) { 3936263203eSArnd Bergmann inode->i_gid = dir->i_gid; 3946263203eSArnd Bergmann inode->i_mode &= S_ISGID; 3956263203eSArnd Bergmann } 3966263203eSArnd Bergmann gang = alloc_spu_gang(); 3976263203eSArnd Bergmann SPUFS_I(inode)->i_ctx = NULL; 3986263203eSArnd Bergmann SPUFS_I(inode)->i_gang = gang; 3996263203eSArnd Bergmann if (!gang) 4006263203eSArnd Bergmann goto out_iput; 4016263203eSArnd Bergmann 4026263203eSArnd Bergmann inode->i_op = &spufs_dir_inode_operations; 4036263203eSArnd Bergmann inode->i_fop = &simple_dir_operations; 4046263203eSArnd Bergmann 4056263203eSArnd Bergmann d_instantiate(dentry, inode); 4066263203eSArnd Bergmann dget(dentry); 4076263203eSArnd Bergmann dir->i_nlink++; 4086263203eSArnd Bergmann dentry->d_inode->i_nlink++; 4096263203eSArnd Bergmann return ret; 4106263203eSArnd Bergmann 4116263203eSArnd Bergmann out_iput: 4126263203eSArnd Bergmann iput(inode); 4136263203eSArnd Bergmann out: 4146263203eSArnd Bergmann return ret; 4156263203eSArnd Bergmann } 4166263203eSArnd Bergmann 4176263203eSArnd Bergmann static int spufs_gang_open(struct dentry *dentry, struct vfsmount *mnt) 4186263203eSArnd Bergmann { 4196263203eSArnd Bergmann int ret; 4206263203eSArnd Bergmann struct file *filp; 4216263203eSArnd Bergmann 4226263203eSArnd Bergmann ret = get_unused_fd(); 4236263203eSArnd Bergmann if (ret < 0) { 4246263203eSArnd Bergmann dput(dentry); 4256263203eSArnd Bergmann mntput(mnt); 4266263203eSArnd Bergmann goto out; 4276263203eSArnd Bergmann } 4286263203eSArnd Bergmann 4296263203eSArnd Bergmann filp = dentry_open(dentry, mnt, O_RDONLY); 4306263203eSArnd Bergmann if (IS_ERR(filp)) { 4316263203eSArnd Bergmann put_unused_fd(ret); 4326263203eSArnd Bergmann ret = PTR_ERR(filp); 4336263203eSArnd Bergmann goto out; 4346263203eSArnd Bergmann } 4356263203eSArnd Bergmann 4366263203eSArnd Bergmann filp->f_op = &spufs_gang_fops; 4376263203eSArnd Bergmann fd_install(ret, filp); 4386263203eSArnd Bergmann out: 4396263203eSArnd Bergmann return ret; 4406263203eSArnd Bergmann } 4416263203eSArnd Bergmann 4426263203eSArnd Bergmann static int spufs_create_gang(struct inode *inode, 4436263203eSArnd Bergmann struct dentry *dentry, 4446263203eSArnd Bergmann struct vfsmount *mnt, int mode) 4456263203eSArnd Bergmann { 4466263203eSArnd Bergmann int ret; 4476263203eSArnd Bergmann 4486263203eSArnd Bergmann ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO); 4496263203eSArnd Bergmann if (ret) 4506263203eSArnd Bergmann goto out; 4516263203eSArnd Bergmann 4526263203eSArnd Bergmann /* 4536263203eSArnd Bergmann * get references for dget and mntget, will be released 4546263203eSArnd Bergmann * in error path of *_open(). 4556263203eSArnd Bergmann */ 4566263203eSArnd Bergmann ret = spufs_gang_open(dget(dentry), mntget(mnt)); 4576263203eSArnd Bergmann if (ret < 0) 4586263203eSArnd Bergmann WARN_ON(spufs_rmgang(inode, dentry)); 4596263203eSArnd Bergmann 4606263203eSArnd Bergmann out: 4616263203eSArnd Bergmann mutex_unlock(&inode->i_mutex); 4626263203eSArnd Bergmann dput(dentry); 4636263203eSArnd Bergmann return ret; 4646263203eSArnd Bergmann } 4656263203eSArnd Bergmann 4666263203eSArnd Bergmann 467346f4d3cSArnd Bergmann static struct file_system_type spufs_type; 468346f4d3cSArnd Bergmann 4696263203eSArnd Bergmann long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode) 47067207b96SArnd Bergmann { 47167207b96SArnd Bergmann struct dentry *dentry; 47267207b96SArnd Bergmann int ret; 47367207b96SArnd Bergmann 47467207b96SArnd Bergmann ret = -EINVAL; 4756263203eSArnd Bergmann /* check if we are on spufs */ 4766263203eSArnd Bergmann if (nd->dentry->d_sb->s_type != &spufs_type) 47767207b96SArnd Bergmann goto out; 47867207b96SArnd Bergmann 4796263203eSArnd Bergmann /* don't accept undefined flags */ 4809add11daSArnd Bergmann if (flags & (~SPU_CREATE_FLAG_ALL)) 481c9832948Sarnd@arndb.de goto out; 482c9832948Sarnd@arndb.de 4836263203eSArnd Bergmann /* only threads can be underneath a gang */ 4846263203eSArnd Bergmann if (nd->dentry != nd->dentry->d_sb->s_root) { 4856263203eSArnd Bergmann if ((flags & SPU_CREATE_GANG) || 4866263203eSArnd Bergmann !SPUFS_I(nd->dentry->d_inode)->i_gang) 4876263203eSArnd Bergmann goto out; 4886263203eSArnd Bergmann } 4896263203eSArnd Bergmann 49067207b96SArnd Bergmann dentry = lookup_create(nd, 1); 49167207b96SArnd Bergmann ret = PTR_ERR(dentry); 49267207b96SArnd Bergmann if (IS_ERR(dentry)) 49367207b96SArnd Bergmann goto out_dir; 49467207b96SArnd Bergmann 49567207b96SArnd Bergmann ret = -EEXIST; 49667207b96SArnd Bergmann if (dentry->d_inode) 49767207b96SArnd Bergmann goto out_dput; 49867207b96SArnd Bergmann 49967207b96SArnd Bergmann mode &= ~current->fs->umask; 50067207b96SArnd Bergmann 5016263203eSArnd Bergmann if (flags & SPU_CREATE_GANG) 5026263203eSArnd Bergmann return spufs_create_gang(nd->dentry->d_inode, 5036263203eSArnd Bergmann dentry, nd->mnt, mode); 5046263203eSArnd Bergmann else 5056263203eSArnd Bergmann return spufs_create_context(nd->dentry->d_inode, 5066263203eSArnd Bergmann dentry, nd->mnt, flags, mode); 50767207b96SArnd Bergmann 50867207b96SArnd Bergmann out_dput: 50967207b96SArnd Bergmann dput(dentry); 51067207b96SArnd Bergmann out_dir: 5111b1dcc1bSJes Sorensen mutex_unlock(&nd->dentry->d_inode->i_mutex); 51267207b96SArnd Bergmann out: 51367207b96SArnd Bergmann return ret; 51467207b96SArnd Bergmann } 51567207b96SArnd Bergmann 51667207b96SArnd Bergmann /* File system initialization */ 51767207b96SArnd Bergmann enum { 51867207b96SArnd Bergmann Opt_uid, Opt_gid, Opt_err, 51967207b96SArnd Bergmann }; 52067207b96SArnd Bergmann 52167207b96SArnd Bergmann static match_table_t spufs_tokens = { 52267207b96SArnd Bergmann { Opt_uid, "uid=%d" }, 52367207b96SArnd Bergmann { Opt_gid, "gid=%d" }, 52467207b96SArnd Bergmann { Opt_err, NULL }, 52567207b96SArnd Bergmann }; 52667207b96SArnd Bergmann 52767207b96SArnd Bergmann static int 52867207b96SArnd Bergmann spufs_parse_options(char *options, struct inode *root) 52967207b96SArnd Bergmann { 53067207b96SArnd Bergmann char *p; 53167207b96SArnd Bergmann substring_t args[MAX_OPT_ARGS]; 53267207b96SArnd Bergmann 53367207b96SArnd Bergmann while ((p = strsep(&options, ",")) != NULL) { 53467207b96SArnd Bergmann int token, option; 53567207b96SArnd Bergmann 53667207b96SArnd Bergmann if (!*p) 53767207b96SArnd Bergmann continue; 53867207b96SArnd Bergmann 53967207b96SArnd Bergmann token = match_token(p, spufs_tokens, args); 54067207b96SArnd Bergmann switch (token) { 54167207b96SArnd Bergmann case Opt_uid: 54267207b96SArnd Bergmann if (match_int(&args[0], &option)) 54367207b96SArnd Bergmann return 0; 54467207b96SArnd Bergmann root->i_uid = option; 54567207b96SArnd Bergmann break; 54667207b96SArnd Bergmann case Opt_gid: 54767207b96SArnd Bergmann if (match_int(&args[0], &option)) 54867207b96SArnd Bergmann return 0; 54967207b96SArnd Bergmann root->i_gid = option; 55067207b96SArnd Bergmann break; 55167207b96SArnd Bergmann default: 55267207b96SArnd Bergmann return 0; 55367207b96SArnd Bergmann } 55467207b96SArnd Bergmann } 55567207b96SArnd Bergmann return 1; 55667207b96SArnd Bergmann } 55767207b96SArnd Bergmann 55867207b96SArnd Bergmann static int 5598b3d6663SArnd Bergmann spufs_create_root(struct super_block *sb, void *data) 5608b3d6663SArnd Bergmann { 56167207b96SArnd Bergmann struct inode *inode; 56267207b96SArnd Bergmann int ret; 56367207b96SArnd Bergmann 56467207b96SArnd Bergmann ret = -ENOMEM; 56567207b96SArnd Bergmann inode = spufs_new_inode(sb, S_IFDIR | 0775); 56667207b96SArnd Bergmann if (!inode) 56767207b96SArnd Bergmann goto out; 56867207b96SArnd Bergmann 56967207b96SArnd Bergmann inode->i_op = &spufs_dir_inode_operations; 57067207b96SArnd Bergmann inode->i_fop = &simple_dir_operations; 57167207b96SArnd Bergmann SPUFS_I(inode)->i_ctx = NULL; 57267207b96SArnd Bergmann 57367207b96SArnd Bergmann ret = -EINVAL; 57467207b96SArnd Bergmann if (!spufs_parse_options(data, inode)) 57567207b96SArnd Bergmann goto out_iput; 57667207b96SArnd Bergmann 57767207b96SArnd Bergmann ret = -ENOMEM; 57867207b96SArnd Bergmann sb->s_root = d_alloc_root(inode); 57967207b96SArnd Bergmann if (!sb->s_root) 58067207b96SArnd Bergmann goto out_iput; 58167207b96SArnd Bergmann 58267207b96SArnd Bergmann return 0; 58367207b96SArnd Bergmann out_iput: 58467207b96SArnd Bergmann iput(inode); 58567207b96SArnd Bergmann out: 58667207b96SArnd Bergmann return ret; 58767207b96SArnd Bergmann } 58867207b96SArnd Bergmann 58967207b96SArnd Bergmann static int 59067207b96SArnd Bergmann spufs_fill_super(struct super_block *sb, void *data, int silent) 59167207b96SArnd Bergmann { 59267207b96SArnd Bergmann static struct super_operations s_ops = { 59367207b96SArnd Bergmann .alloc_inode = spufs_alloc_inode, 59467207b96SArnd Bergmann .destroy_inode = spufs_destroy_inode, 59567207b96SArnd Bergmann .statfs = simple_statfs, 59667207b96SArnd Bergmann .delete_inode = spufs_delete_inode, 59767207b96SArnd Bergmann .drop_inode = generic_delete_inode, 59867207b96SArnd Bergmann }; 59967207b96SArnd Bergmann 60067207b96SArnd Bergmann sb->s_maxbytes = MAX_LFS_FILESIZE; 60167207b96SArnd Bergmann sb->s_blocksize = PAGE_CACHE_SIZE; 60267207b96SArnd Bergmann sb->s_blocksize_bits = PAGE_CACHE_SHIFT; 60367207b96SArnd Bergmann sb->s_magic = SPUFS_MAGIC; 60467207b96SArnd Bergmann sb->s_op = &s_ops; 60567207b96SArnd Bergmann 60667207b96SArnd Bergmann return spufs_create_root(sb, data); 60767207b96SArnd Bergmann } 60867207b96SArnd Bergmann 609454e2398SDavid Howells static int 61067207b96SArnd Bergmann spufs_get_sb(struct file_system_type *fstype, int flags, 611454e2398SDavid Howells const char *name, void *data, struct vfsmount *mnt) 61267207b96SArnd Bergmann { 613454e2398SDavid Howells return get_sb_single(fstype, flags, data, spufs_fill_super, mnt); 61467207b96SArnd Bergmann } 61567207b96SArnd Bergmann 61667207b96SArnd Bergmann static struct file_system_type spufs_type = { 61767207b96SArnd Bergmann .owner = THIS_MODULE, 61867207b96SArnd Bergmann .name = "spufs", 61967207b96SArnd Bergmann .get_sb = spufs_get_sb, 62067207b96SArnd Bergmann .kill_sb = kill_litter_super, 62167207b96SArnd Bergmann }; 62267207b96SArnd Bergmann 623e78b47a5SArnd Bergmann static int __init spufs_init(void) 62467207b96SArnd Bergmann { 62567207b96SArnd Bergmann int ret; 62667207b96SArnd Bergmann ret = -ENOMEM; 62767207b96SArnd Bergmann spufs_inode_cache = kmem_cache_create("spufs_inode_cache", 62867207b96SArnd Bergmann sizeof(struct spufs_inode_info), 0, 62967207b96SArnd Bergmann SLAB_HWCACHE_ALIGN, spufs_init_once, NULL); 63067207b96SArnd Bergmann 63167207b96SArnd Bergmann if (!spufs_inode_cache) 63267207b96SArnd Bergmann goto out; 6338b3d6663SArnd Bergmann if (spu_sched_init() != 0) { 6348b3d6663SArnd Bergmann kmem_cache_destroy(spufs_inode_cache); 6358b3d6663SArnd Bergmann goto out; 6368b3d6663SArnd Bergmann } 63767207b96SArnd Bergmann ret = register_filesystem(&spufs_type); 63867207b96SArnd Bergmann if (ret) 63967207b96SArnd Bergmann goto out_cache; 64067207b96SArnd Bergmann ret = register_spu_syscalls(&spufs_calls); 64167207b96SArnd Bergmann if (ret) 64267207b96SArnd Bergmann goto out_fs; 64367207b96SArnd Bergmann return 0; 64467207b96SArnd Bergmann out_fs: 64567207b96SArnd Bergmann unregister_filesystem(&spufs_type); 64667207b96SArnd Bergmann out_cache: 64767207b96SArnd Bergmann kmem_cache_destroy(spufs_inode_cache); 64867207b96SArnd Bergmann out: 64967207b96SArnd Bergmann return ret; 65067207b96SArnd Bergmann } 65167207b96SArnd Bergmann module_init(spufs_init); 65267207b96SArnd Bergmann 653e78b47a5SArnd Bergmann static void __exit spufs_exit(void) 65467207b96SArnd Bergmann { 6558b3d6663SArnd Bergmann spu_sched_exit(); 65667207b96SArnd Bergmann unregister_spu_syscalls(&spufs_calls); 65767207b96SArnd Bergmann unregister_filesystem(&spufs_type); 65867207b96SArnd Bergmann kmem_cache_destroy(spufs_inode_cache); 65967207b96SArnd Bergmann } 66067207b96SArnd Bergmann module_exit(spufs_exit); 66167207b96SArnd Bergmann 66267207b96SArnd Bergmann MODULE_LICENSE("GPL"); 66367207b96SArnd Bergmann MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>"); 66467207b96SArnd Bergmann 665