[net-next-2.6.git] / arch / powerpc / platforms / cell / spufs / inode.c

/*
 * SPU file system
 *
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
 *
 * Author: Arnd Bergmann <arndb@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/file.h>
#include <linux/fs.h>
#include <linux/backing-dev.h>
#include <linux/init.h>
#include <linux/ioctl.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/pagemap.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/parser.h>

#include <asm/io.h>
#include <asm/semaphore.h>
#include <asm/spu.h>
#include <asm/uaccess.h>

#include "spufs.h"

static kmem_cache_t *spufs_inode_cache;

static struct inode *
spufs_alloc_inode(struct super_block *sb)
{
	struct spufs_inode_info *ei;

	ei = kmem_cache_alloc(spufs_inode_cache, SLAB_KERNEL);
	if (!ei)
		return NULL;
	return &ei->vfs_inode;
}

static void
spufs_destroy_inode(struct inode *inode)
{
	kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
}

static void
spufs_init_once(void *p, kmem_cache_t * cachep, unsigned long flags)
{
	struct spufs_inode_info *ei = p;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR) {
		inode_init_once(&ei->vfs_inode);
	}
}

static struct inode *
spufs_new_inode(struct super_block *sb, int mode)
{
	struct inode *inode;

	inode = new_inode(sb);
	if (!inode)
		goto out;

	inode->i_mode = mode;
	inode->i_uid = current->fsuid;
	inode->i_gid = current->fsgid;
	inode->i_blksize = PAGE_CACHE_SIZE;
	inode->i_blocks = 0;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
out:
	return inode;
}

static int
spufs_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;

	if ((attr->ia_valid & ATTR_SIZE) &&
	    (attr->ia_size != inode->i_size))
		return -EINVAL;
	return inode_setattr(inode, attr);
}


static int
spufs_new_file(struct super_block *sb, struct dentry *dentry,
		const struct file_operations *fops, int mode,
		struct spu_context *ctx)
{
	static struct inode_operations spufs_file_iops = {
		.setattr = spufs_setattr,
	};
	struct inode *inode;
	int ret;

	ret = -ENOSPC;
	inode = spufs_new_inode(sb, S_IFREG | mode);
	if (!inode)
		goto out;

	ret = 0;
	inode->i_op = &spufs_file_iops;
	inode->i_fop = fops;
	inode->u.generic_ip = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
	d_add(dentry, inode);
out:
	return ret;
}

static void
spufs_delete_inode(struct inode *inode)
{
	if (SPUFS_I(inode)->i_ctx)
		put_spu_context(SPUFS_I(inode)->i_ctx);
	clear_inode(inode);
}

static void spufs_prune_dir(struct dentry *dir)
{
	struct dentry *dentry, *tmp;
	mutex_lock(&dir->d_inode->i_mutex);
	list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
		spin_lock(&dcache_lock);
		spin_lock(&dentry->d_lock);
		if (!(d_unhashed(dentry)) && dentry->d_inode) {
			dget_locked(dentry);
			__d_drop(dentry);
			spin_unlock(&dentry->d_lock);
			simple_unlink(dir->d_inode, dentry);
			spin_unlock(&dcache_lock);
			dput(dentry);
		} else {
			spin_unlock(&dentry->d_lock);
			spin_unlock(&dcache_lock);
		}
	}
	shrink_dcache_parent(dir);
	mutex_unlock(&dir->d_inode->i_mutex);
}

static int spufs_rmdir(struct inode *root, struct dentry *dir_dentry)
{
	struct spu_context *ctx;

	/* remove all entries */
	mutex_lock(&root->i_mutex);
	spufs_prune_dir(dir_dentry);
	mutex_unlock(&root->i_mutex);

	/* We have to give up the mm_struct */
	ctx = SPUFS_I(dir_dentry->d_inode)->i_ctx;
	spu_forget(ctx);

	/* XXX Do we need to hold i_mutex here ? */
	return simple_rmdir(root, dir_dentry);
}

static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
			  int mode, struct spu_context *ctx)
{
	struct dentry *dentry;
	int ret;

	while (files->name && files->name[0]) {
		ret = -ENOMEM;
		dentry = d_alloc_name(dir, files->name);
		if (!dentry)
			goto out;
		ret = spufs_new_file(dir->d_sb, dentry, files->ops,
					files->mode & mode, ctx);
		if (ret)
			goto out;
		files++;
	}
	return 0;
out:
	spufs_prune_dir(dir);
	return ret;
}

static int spufs_dir_close(struct inode *inode, struct file *file)
{
	struct inode *dir;
	struct dentry *dentry;
	int ret;

	dentry = file->f_dentry;
	dir = dentry->d_parent->d_inode;

	ret = spufs_rmdir(dir, dentry);
	WARN_ON(ret);

	return dcache_dir_close(inode, file);
}

struct inode_operations spufs_dir_inode_operations = {
	.lookup = simple_lookup,
};

struct file_operations spufs_context_fops = {
	.open		= dcache_dir_open,
	.release	= spufs_dir_close,
	.llseek		= dcache_dir_lseek,
	.read		= generic_read_dir,
	.readdir	= dcache_readdir,
	.fsync		= simple_sync_file,
};

static int
spufs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	int ret;
	struct inode *inode;
	struct spu_context *ctx;

	ret = -ENOSPC;
	inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
	if (!inode)
		goto out;

	if (dir->i_mode & S_ISGID) {
		inode->i_gid = dir->i_gid;
		inode->i_mode &= S_ISGID;
	}
	ctx = alloc_spu_context(inode->i_mapping);
	SPUFS_I(inode)->i_ctx = ctx;
	if (!ctx)
		goto out_iput;

	inode->i_op = &spufs_dir_inode_operations;
	inode->i_fop = &simple_dir_operations;
	ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
	if (ret)
		goto out_free_ctx;

	d_instantiate(dentry, inode);
	dget(dentry);
	dir->i_nlink++;
	dentry->d_inode->i_nlink++;
	goto out;

out_free_ctx:
	put_spu_context(ctx);
out_iput:
	iput(inode);
out:
	return ret;
}

static int spufs_context_open(struct dentry *dentry, struct vfsmount *mnt)
{
	int ret;
	struct file *filp;

	ret = get_unused_fd();
	if (ret < 0) {
		dput(dentry);
		mntput(mnt);
		goto out;
	}

	filp = dentry_open(dentry, mnt, O_RDONLY);
	if (IS_ERR(filp)) {
		put_unused_fd(ret);
		ret = PTR_ERR(filp);
		goto out;
	}

	filp->f_op = &spufs_context_fops;
	fd_install(ret, filp);
out:
	return ret;
}

static struct file_system_type spufs_type;

long spufs_create_thread(struct nameidata *nd,
			 unsigned int flags, mode_t mode)
{
	struct dentry *dentry;
	int ret;

	/* need to be at the root of spufs */
	ret = -EINVAL;
	if (nd->dentry->d_sb->s_type != &spufs_type ||
	    nd->dentry != nd->dentry->d_sb->s_root)
		goto out;

	dentry = lookup_create(nd, 1);
	ret = PTR_ERR(dentry);
	if (IS_ERR(dentry))
		goto out_dir;

	ret = -EEXIST;
	if (dentry->d_inode)
		goto out_dput;

	mode &= ~current->fs->umask;
	ret = spufs_mkdir(nd->dentry->d_inode, dentry, mode & S_IRWXUGO);
	if (ret)
		goto out_dput;

	/*
	 * get references for dget and mntget, will be released
	 * in error path of *_open().
	 */
	ret = spufs_context_open(dget(dentry), mntget(nd->mnt));
	if (ret < 0)
		spufs_rmdir(nd->dentry->d_inode, dentry);

out_dput:
	dput(dentry);
out_dir:
	mutex_unlock(&nd->dentry->d_inode->i_mutex);
out:
	return ret;
}

/* File system initialization */
enum {
	Opt_uid, Opt_gid, Opt_err,
};

static match_table_t spufs_tokens = {
	{ Opt_uid, "uid=%d" },
	{ Opt_gid, "gid=%d" },
	{ Opt_err, NULL  },
};

static int
spufs_parse_options(char *options, struct inode *root)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];

	while ((p = strsep(&options, ",")) != NULL) {
		int token, option;

		if (!*p)
			continue;

		token = match_token(p, spufs_tokens, args);
		switch (token) {
		case Opt_uid:
			if (match_int(&args[0], &option))
				return 0;
			root->i_uid = option;
			break;
		case Opt_gid:
			if (match_int(&args[0], &option))
				return 0;
			root->i_gid = option;
			break;
		default:
			return 0;
		}
	}
	return 1;
}

static int
spufs_create_root(struct super_block *sb, void *data)
{
	struct inode *inode;
	int ret;

	ret = -ENOMEM;
	inode = spufs_new_inode(sb, S_IFDIR | 0775);
	if (!inode)
		goto out;

	inode->i_op = &spufs_dir_inode_operations;
	inode->i_fop = &simple_dir_operations;
	SPUFS_I(inode)->i_ctx = NULL;

	ret = -EINVAL;
	if (!spufs_parse_options(data, inode))
		goto out_iput;

	ret = -ENOMEM;
	sb->s_root = d_alloc_root(inode);
	if (!sb->s_root)
		goto out_iput;

	return 0;
out_iput:
	iput(inode);
out:
	return ret;
}

static int
spufs_fill_super(struct super_block *sb, void *data, int silent)
{
	static struct super_operations s_ops = {
		.alloc_inode = spufs_alloc_inode,
		.destroy_inode = spufs_destroy_inode,
		.statfs = simple_statfs,
		.delete_inode = spufs_delete_inode,
		.drop_inode = generic_delete_inode,
	};

	sb->s_maxbytes = MAX_LFS_FILESIZE;
	sb->s_blocksize = PAGE_CACHE_SIZE;
	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	sb->s_magic = SPUFS_MAGIC;
	sb->s_op = &s_ops;

	return spufs_create_root(sb, data);
}

static struct super_block *
spufs_get_sb(struct file_system_type *fstype, int flags,
		const char *name, void *data)
{
	return get_sb_single(fstype, flags, data, spufs_fill_super);
}

static struct file_system_type spufs_type = {
	.owner = THIS_MODULE,
	.name = "spufs",
	.get_sb = spufs_get_sb,
	.kill_sb = kill_litter_super,
};

static int spufs_init(void)
{
	int ret;
	ret = -ENOMEM;
	spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
			sizeof(struct spufs_inode_info), 0,
			SLAB_HWCACHE_ALIGN, spufs_init_once, NULL);

	if (!spufs_inode_cache)
		goto out;
	if (spu_sched_init() != 0) {
		kmem_cache_destroy(spufs_inode_cache);
		goto out;
	}
	ret = register_filesystem(&spufs_type);
	if (ret)
		goto out_cache;
	ret = register_spu_syscalls(&spufs_calls);
	if (ret)
		goto out_fs;
	return 0;
out_fs:
	unregister_filesystem(&spufs_type);
out_cache:
	kmem_cache_destroy(spufs_inode_cache);
out:
	return ret;
}
module_init(spufs_init);

static void spufs_exit(void)
{
	spu_sched_exit();
	unregister_spu_syscalls(&spufs_calls);
	unregister_filesystem(&spufs_type);
	kmem_cache_destroy(spufs_inode_cache);
}
module_exit(spufs_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
Commit	Line	Data
67207b96 AB	1	/*
	2	* SPU file system
	3	*
	4	* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
	5	*
	6	* Author: Arnd Bergmann <arndb@de.ibm.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2, or (at your option)
	11	* any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*/
	22
	23	#include <linux/file.h>
	24	#include <linux/fs.h>
	25	#include <linux/backing-dev.h>
	26	#include <linux/init.h>
	27	#include <linux/ioctl.h>
	28	#include <linux/module.h>
346f4d3c	29	#include <linux/mount.h>
67207b96 AB	30	#include <linux/namei.h>
	31	#include <linux/pagemap.h>
	32	#include <linux/poll.h>
	33	#include <linux/slab.h>
	34	#include <linux/parser.h>
	35
	36	#include <asm/io.h>
	37	#include <asm/semaphore.h>
	38	#include <asm/spu.h>
	39	#include <asm/uaccess.h>
	40
	41	#include "spufs.h"
	42
	43	static kmem_cache_t *spufs_inode_cache;
	44
67207b96 AB	45	static struct inode *
	46	spufs_alloc_inode(struct super_block *sb)
	47	{
	48	struct spufs_inode_info *ei;
	49
	50	ei = kmem_cache_alloc(spufs_inode_cache, SLAB_KERNEL);
	51	if (!ei)
	52	return NULL;
	53	return &ei->vfs_inode;
	54	}
	55
	56	static void
	57	spufs_destroy_inode(struct inode *inode)
	58	{
	59	kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
	60	}
	61
	62	static void
	63	spufs_init_once(void p, kmem_cache_t cachep, unsigned long flags)
	64	{
	65	struct spufs_inode_info *ei = p;
	66
	67	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	68	SLAB_CTOR_CONSTRUCTOR) {
	69	inode_init_once(&ei->vfs_inode);
	70	}
	71	}
	72
	73	static struct inode *
	74	spufs_new_inode(struct super_block *sb, int mode)
	75	{
	76	struct inode *inode;
	77
	78	inode = new_inode(sb);
	79	if (!inode)
	80	goto out;
	81
	82	inode->i_mode = mode;
	83	inode->i_uid = current->fsuid;
	84	inode->i_gid = current->fsgid;
	85	inode->i_blksize = PAGE_CACHE_SIZE;
	86	inode->i_blocks = 0;
	87	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	88	out:
	89	return inode;
	90	}
	91
	92	static int
	93	spufs_setattr(struct dentry dentry, struct iattr attr)
	94	{
	95	struct inode *inode = dentry->d_inode;
	96
67207b96 AB	97	if ((attr->ia_valid & ATTR_SIZE) &&
	98	(attr->ia_size != inode->i_size))
	99	return -EINVAL;
	100	return inode_setattr(inode, attr);
	101	}
	102
	103
	104	static int
	105	spufs_new_file(struct super_block sb, struct dentry dentry,
99ac48f5	106	const struct file_operations *fops, int mode,
67207b96 AB	107	struct spu_context *ctx)
	108	{
	109	static struct inode_operations spufs_file_iops = {
67207b96	110	.setattr = spufs_setattr,
67207b96 AB	111	};
	112	struct inode *inode;
	113	int ret;
	114
	115	ret = -ENOSPC;
	116	inode = spufs_new_inode(sb, S_IFREG \| mode);
	117	if (!inode)
	118	goto out;
	119
	120	ret = 0;
	121	inode->i_op = &spufs_file_iops;
	122	inode->i_fop = fops;
	123	inode->u.generic_ip = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
	124	d_add(dentry, inode);
	125	out:
	126	return ret;
	127	}
	128
	129	static void
	130	spufs_delete_inode(struct inode *inode)
	131	{
	132	if (SPUFS_I(inode)->i_ctx)
	133	put_spu_context(SPUFS_I(inode)->i_ctx);
	134	clear_inode(inode);
	135	}
	136
3f51dd91	137	static void spufs_prune_dir(struct dentry *dir)
67207b96	138	{
8b3d6663	139	struct dentry dentry, tmp;
1b1dcc1b	140	mutex_lock(&dir->d_inode->i_mutex);
c3a9aea7	141	list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
8b3d6663	142	spin_lock(&dcache_lock);
67207b96	143	spin_lock(&dentry->d_lock);
8b3d6663 AB	144	if (!(d_unhashed(dentry)) && dentry->d_inode) {
	145	dget_locked(dentry);
	146	__d_drop(dentry);
	147	spin_unlock(&dentry->d_lock);
3f51dd91	148	simple_unlink(dir->d_inode, dentry);
8b3d6663 AB	149	spin_unlock(&dcache_lock);
	150	dput(dentry);
	151	} else {
	152	spin_unlock(&dentry->d_lock);
	153	spin_unlock(&dcache_lock);
	154	}
67207b96	155	}
3f51dd91	156	shrink_dcache_parent(dir);
1b1dcc1b	157	mutex_unlock(&dir->d_inode->i_mutex);
3f51dd91 AB	158	}
	159
	160	static int spufs_rmdir(struct inode root, struct dentry dir_dentry)
	161	{
	162	struct spu_context *ctx;
	163
	164	/* remove all entries */
1b1dcc1b	165	mutex_lock(&root->i_mutex);
3f51dd91	166	spufs_prune_dir(dir_dentry);
1b1dcc1b	167	mutex_unlock(&root->i_mutex);
8b3d6663 AB	168
	169	/* We have to give up the mm_struct */
	170	ctx = SPUFS_I(dir_dentry->d_inode)->i_ctx;
	171	spu_forget(ctx);
	172
1b1dcc1b	173	/* XXX Do we need to hold i_mutex here ? */
c8ca0633	174	return simple_rmdir(root, dir_dentry);
67207b96 AB	175	}
67207b96 AB	176
3f51dd91 AB	177	static int spufs_fill_dir(struct dentry dir, struct tree_descr files,
	178	int mode, struct spu_context *ctx)
	179	{
	180	struct dentry *dentry;
	181	int ret;
	182
	183	while (files->name && files->name[0]) {
	184	ret = -ENOMEM;
	185	dentry = d_alloc_name(dir, files->name);
	186	if (!dentry)
	187	goto out;
	188	ret = spufs_new_file(dir->d_sb, dentry, files->ops,
	189	files->mode & mode, ctx);
	190	if (ret)
	191	goto out;
	192	files++;
	193	}
	194	return 0;
	195	out:
	196	spufs_prune_dir(dir);
	197	return ret;
	198	}
	199
67207b96 AB	200	static int spufs_dir_close(struct inode inode, struct file file)
	201	{
	202	struct inode *dir;
	203	struct dentry *dentry;
	204	int ret;
	205
	206	dentry = file->f_dentry;
	207	dir = dentry->d_parent->d_inode;
c8ca0633 AB	208
c8ca0633 AB	209	ret = spufs_rmdir(dir, dentry);
67207b96	210	WARN_ON(ret);
c8ca0633	211
67207b96 AB	212	return dcache_dir_close(inode, file);
	213	}
	214
	215	struct inode_operations spufs_dir_inode_operations = {
	216	.lookup = simple_lookup,
	217	};
	218
e80358ad	219	struct file_operations spufs_context_fops = {
67207b96 AB	220	.open = dcache_dir_open,
	221	.release = spufs_dir_close,
	222	.llseek = dcache_dir_lseek,
	223	.read = generic_read_dir,
	224	.readdir = dcache_readdir,
	225	.fsync = simple_sync_file,
	226	};
	227
	228	static int
	229	spufs_mkdir(struct inode dir, struct dentry dentry, int mode)
	230	{
	231	int ret;
	232	struct inode *inode;
	233	struct spu_context *ctx;
	234
	235	ret = -ENOSPC;
	236	inode = spufs_new_inode(dir->i_sb, mode \| S_IFDIR);
	237	if (!inode)
	238	goto out;
	239
	240	if (dir->i_mode & S_ISGID) {
	241	inode->i_gid = dir->i_gid;
	242	inode->i_mode &= S_ISGID;
	243	}
8b3d6663	244	ctx = alloc_spu_context(inode->i_mapping);
67207b96 AB	245	SPUFS_I(inode)->i_ctx = ctx;
	246	if (!ctx)
	247	goto out_iput;
	248
	249	inode->i_op = &spufs_dir_inode_operations;
	250	inode->i_fop = &simple_dir_operations;
	251	ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
	252	if (ret)
	253	goto out_free_ctx;
	254
	255	d_instantiate(dentry, inode);
	256	dget(dentry);
	257	dir->i_nlink++;
346f4d3c	258	dentry->d_inode->i_nlink++;
67207b96 AB	259	goto out;
	260
	261	out_free_ctx:
	262	put_spu_context(ctx);
	263	out_iput:
	264	iput(inode);
	265	out:
	266	return ret;
	267	}
	268
346f4d3c AB	269	static int spufs_context_open(struct dentry dentry, struct vfsmount mnt)
	270	{
	271	int ret;
	272	struct file *filp;
	273
	274	ret = get_unused_fd();
	275	if (ret < 0) {
	276	dput(dentry);
	277	mntput(mnt);
	278	goto out;
	279	}
	280
	281	filp = dentry_open(dentry, mnt, O_RDONLY);
	282	if (IS_ERR(filp)) {
	283	put_unused_fd(ret);
	284	ret = PTR_ERR(filp);
	285	goto out;
	286	}
	287
	288	filp->f_op = &spufs_context_fops;
	289	fd_install(ret, filp);
	290	out:
	291	return ret;
	292	}
	293
	294	static struct file_system_type spufs_type;
	295
6ff730c3 AB	296	long spufs_create_thread(struct nameidata *nd,
6ff730c3 AB	297	unsigned int flags, mode_t mode)
67207b96 AB	298	{
67207b96 AB	299	struct dentry *dentry;
67207b96 AB	300	int ret;
	301
	302	/* need to be at the root of spufs */
	303	ret = -EINVAL;
346f4d3c AB	304	if (nd->dentry->d_sb->s_type != &spufs_type \|\|
346f4d3c AB	305	nd->dentry != nd->dentry->d_sb->s_root)
67207b96 AB	306	goto out;
	307
	308	dentry = lookup_create(nd, 1);
	309	ret = PTR_ERR(dentry);
	310	if (IS_ERR(dentry))
	311	goto out_dir;
	312
	313	ret = -EEXIST;
	314	if (dentry->d_inode)
	315	goto out_dput;
	316
	317	mode &= ~current->fs->umask;
	318	ret = spufs_mkdir(nd->dentry->d_inode, dentry, mode & S_IRWXUGO);
	319	if (ret)
	320	goto out_dput;
	321
346f4d3c AB	322	/*
	323	* get references for dget and mntget, will be released
	324	* in error path of *_open().
	325	*/
	326	ret = spufs_context_open(dget(dentry), mntget(nd->mnt));
67207b96	327	if (ret < 0)
346f4d3c	328	spufs_rmdir(nd->dentry->d_inode, dentry);
67207b96 AB	329
	330	out_dput:
	331	dput(dentry);
	332	out_dir:
1b1dcc1b	333	mutex_unlock(&nd->dentry->d_inode->i_mutex);
67207b96 AB	334	out:
	335	return ret;
	336	}
	337
	338	/* File system initialization */
	339	enum {
	340	Opt_uid, Opt_gid, Opt_err,
	341	};
	342
	343	static match_table_t spufs_tokens = {
	344	{ Opt_uid, "uid=%d" },
	345	{ Opt_gid, "gid=%d" },
	346	{ Opt_err, NULL },
	347	};
	348
	349	static int
	350	spufs_parse_options(char options, struct inode root)
	351	{
	352	char *p;
	353	substring_t args[MAX_OPT_ARGS];
	354
	355	while ((p = strsep(&options, ",")) != NULL) {
	356	int token, option;
	357
	358	if (!*p)
	359	continue;
	360
	361	token = match_token(p, spufs_tokens, args);
	362	switch (token) {
	363	case Opt_uid:
	364	if (match_int(&args[0], &option))
	365	return 0;
	366	root->i_uid = option;
	367	break;
	368	case Opt_gid:
	369	if (match_int(&args[0], &option))
	370	return 0;
	371	root->i_gid = option;
	372	break;
	373	default:
	374	return 0;
	375	}
	376	}
	377	return 1;
	378	}
	379
	380	static int
8b3d6663 AB	381	spufs_create_root(struct super_block sb, void data)
8b3d6663 AB	382	{
67207b96 AB	383	struct inode *inode;
	384	int ret;
	385
	386	ret = -ENOMEM;
	387	inode = spufs_new_inode(sb, S_IFDIR \| 0775);
	388	if (!inode)
	389	goto out;
	390
	391	inode->i_op = &spufs_dir_inode_operations;
	392	inode->i_fop = &simple_dir_operations;
	393	SPUFS_I(inode)->i_ctx = NULL;
	394
	395	ret = -EINVAL;
	396	if (!spufs_parse_options(data, inode))
	397	goto out_iput;
	398
	399	ret = -ENOMEM;
	400	sb->s_root = d_alloc_root(inode);
	401	if (!sb->s_root)
	402	goto out_iput;
	403
	404	return 0;
	405	out_iput:
	406	iput(inode);
	407	out:
	408	return ret;
	409	}
	410
	411	static int
	412	spufs_fill_super(struct super_block sb, void data, int silent)
	413	{
	414	static struct super_operations s_ops = {
	415	.alloc_inode = spufs_alloc_inode,
	416	.destroy_inode = spufs_destroy_inode,
	417	.statfs = simple_statfs,
	418	.delete_inode = spufs_delete_inode,
	419	.drop_inode = generic_delete_inode,
	420	};
	421
	422	sb->s_maxbytes = MAX_LFS_FILESIZE;
	423	sb->s_blocksize = PAGE_CACHE_SIZE;
	424	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	425	sb->s_magic = SPUFS_MAGIC;
	426	sb->s_op = &s_ops;
	427
	428	return spufs_create_root(sb, data);
	429	}
	430
	431	static struct super_block *
	432	spufs_get_sb(struct file_system_type *fstype, int flags,
	433	const char name, void data)
	434	{
	435	return get_sb_single(fstype, flags, data, spufs_fill_super);
	436	}
	437
	438	static struct file_system_type spufs_type = {
	439	.owner = THIS_MODULE,
	440	.name = "spufs",
	441	.get_sb = spufs_get_sb,
	442	.kill_sb = kill_litter_super,
	443	};
	444
	445	static int spufs_init(void)
	446	{
447	int ret;
448	ret = -ENOMEM;
449	spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
450	sizeof(struct spufs_inode_info), 0,
451	SLAB_HWCACHE_ALIGN, spufs_init_once, NULL);
452
453	if (!spufs_inode_cache)
454	goto out;
8b3d6663 AB	455	if (spu_sched_init() != 0) {
	456	kmem_cache_destroy(spufs_inode_cache);
	457	goto out;
	458	}
67207b96 AB	459	ret = register_filesystem(&spufs_type);
	460	if (ret)
	461	goto out_cache;
	462	ret = register_spu_syscalls(&spufs_calls);
	463	if (ret)
	464	goto out_fs;
	465	return 0;
	466	out_fs:
	467	unregister_filesystem(&spufs_type);
	468	out_cache:
	469	kmem_cache_destroy(spufs_inode_cache);
	470	out:
	471	return ret;
	472	}
	473	module_init(spufs_init);
	474
	475	static void spufs_exit(void)
	476	{
8b3d6663	477	spu_sched_exit();
67207b96 AB	478	unregister_spu_syscalls(&spufs_calls);
	479	unregister_filesystem(&spufs_type);
	480	kmem_cache_destroy(spufs_inode_cache);
	481	}
	482	module_exit(spufs_exit);
	483
	484	MODULE_LICENSE("GPL");
	485	MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
	486