[deliverable/linux.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/prom.h>
#include <asm/semaphore.h>
#include <asm/spu.h>
#include <asm/spu_priv1.h>
#include <asm/uaccess.h>

#include "spufs.h"

static struct kmem_cache *spufs_inode_cache;
char *isolated_loader;

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

	ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
	if (!ei)
		return NULL;

	ei->i_gang = NULL;
	ei->i_ctx = NULL;
	ei->i_openers = 0;

	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, struct kmem_cache * cachep, unsigned long flags)
{
	struct spufs_inode_info *ei = p;

	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_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->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
	d_add(dentry, inode);
out:
	return ret;
}

static void
spufs_delete_inode(struct inode *inode)
{
	struct spufs_inode_info *ei = SPUFS_I(inode);

	if (ei->i_ctx)
		put_spu_context(ei->i_ctx);
	if (ei->i_gang)
		put_spu_gang(ei->i_gang);
	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);
}

/* Caller must hold parent->i_mutex */
static int spufs_rmdir(struct inode *parent, struct dentry *dir)
{
	/* remove all entries */
	spufs_prune_dir(dir);

	return simple_rmdir(parent, dir);
}

static int spufs_fill_dir(struct dentry *dir, struct tree_descr *files,
			  int mode, struct spu_context *ctx)
{
	struct dentry *dentry, *tmp;
	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:
	/*
	 * remove all children from dir. dir->inode is not set so don't
	 * just simply use spufs_prune_dir() and panic afterwards :)
	 * dput() looks like it will do the right thing:
	 * - dec parent's ref counter
	 * - remove child from parent's child list
	 * - free child's inode if possible
	 * - free child
	 */
	list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
		dput(dentry);
	}

	shrink_dcache_parent(dir);
	return ret;
}

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

	dir = file->f_path.dentry;
	parent = dir->d_parent->d_inode;
	ctx = SPUFS_I(dir->d_inode)->i_ctx;

	mutex_lock(&parent->i_mutex);
	ret = spufs_rmdir(parent, dir);
	mutex_unlock(&parent->i_mutex);
	WARN_ON(ret);

	/* We have to give up the mm_struct */
	spu_forget(ctx);

	return dcache_dir_close(inode, file);
}

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

const 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,
};
EXPORT_SYMBOL_GPL(spufs_context_fops);

static int
spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
		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(SPUFS_I(dir)->i_gang); /* XXX gang */
	SPUFS_I(inode)->i_ctx = ctx;
	if (!ctx)
		goto out_iput;

	ctx->flags = flags;
	inode->i_op = &spufs_dir_inode_operations;
	inode->i_fop = &simple_dir_operations;
	if (flags & SPU_CREATE_NOSCHED)
		ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
					 mode, ctx);
	else
		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:
	spu_forget(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 int spufs_create_context(struct inode *inode,
			struct dentry *dentry,
			struct vfsmount *mnt, int flags, int mode)
{
	int ret;

	ret = -EPERM;
	if ((flags & SPU_CREATE_NOSCHED) &&
	    !capable(CAP_SYS_NICE))
		goto out_unlock;

	ret = -EINVAL;
	if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
	    == SPU_CREATE_ISOLATE)
		goto out_unlock;

	ret = -ENODEV;
	if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
		goto out_unlock;

	ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
	if (ret)
		goto out_unlock;

	/*
	 * get references for dget and mntget, will be released
	 * in error path of *_open().
	 */
	ret = spufs_context_open(dget(dentry), mntget(mnt));
	if (ret < 0) {
		WARN_ON(spufs_rmdir(inode, dentry));
		mutex_unlock(&inode->i_mutex);
		spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
		goto out;
	}

out_unlock:
	mutex_unlock(&inode->i_mutex);
out:
	dput(dentry);
	return ret;
}

static int
spufs_mkgang(struct inode *dir, struct dentry *dentry, int mode)
{
	int ret;
	struct inode *inode;
	struct spu_gang *gang;

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

	ret = 0;
	if (dir->i_mode & S_ISGID) {
		inode->i_gid = dir->i_gid;
		inode->i_mode &= S_ISGID;
	}
	gang = alloc_spu_gang();
	SPUFS_I(inode)->i_ctx = NULL;
	SPUFS_I(inode)->i_gang = gang;
	if (!gang)
		goto out_iput;

	inode->i_op = &spufs_dir_inode_operations;
	inode->i_fop = &simple_dir_operations;

	d_instantiate(dentry, inode);
	dir->i_nlink++;
	dentry->d_inode->i_nlink++;
	return ret;

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

static int spufs_gang_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 = &simple_dir_operations;
	fd_install(ret, filp);
out:
	return ret;
}

static int spufs_create_gang(struct inode *inode,
			struct dentry *dentry,
			struct vfsmount *mnt, int mode)
{
	int ret;

	ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
	if (ret)
		goto out;

	/*
	 * get references for dget and mntget, will be released
	 * in error path of *_open().
	 */
	ret = spufs_gang_open(dget(dentry), mntget(mnt));
	if (ret < 0) {
		int err = simple_rmdir(inode, dentry);
		WARN_ON(err);
	}

out:
	mutex_unlock(&inode->i_mutex);
	dput(dentry);
	return ret;
}


static struct file_system_type spufs_type;

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

	ret = -EINVAL;
	/* check if we are on spufs */
	if (nd->dentry->d_sb->s_type != &spufs_type)
		goto out;

	/* don't accept undefined flags */
	if (flags & (~SPU_CREATE_FLAG_ALL))
		goto out;

	/* only threads can be underneath a gang */
	if (nd->dentry != nd->dentry->d_sb->s_root) {
		if ((flags & SPU_CREATE_GANG) ||
		    !SPUFS_I(nd->dentry->d_inode)->i_gang)
			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;

	if (flags & SPU_CREATE_GANG)
		return spufs_create_gang(nd->dentry->d_inode,
					dentry, nd->mnt, mode);
	else
		return spufs_create_context(nd->dentry->d_inode,
					dentry, nd->mnt, flags, mode);

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_mode, Opt_err,
};

static match_table_t spufs_tokens = {
	{ Opt_uid,  "uid=%d" },
	{ Opt_gid,  "gid=%d" },
	{ Opt_mode, "mode=%o" },
	{ 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;
		case Opt_mode:
			if (match_octal(&args[0], &option))
				return 0;
			root->i_mode = option | S_IFDIR;
			break;
		default:
			return 0;
		}
	}
	return 1;
}

static void spufs_exit_isolated_loader(void)
{
	kfree(isolated_loader);
}

static void
spufs_init_isolated_loader(void)
{
	struct device_node *dn;
	const char *loader;
	int size;

	dn = of_find_node_by_path("/spu-isolation");
	if (!dn)
		return;

	loader = of_get_property(dn, "loader", &size);
	if (!loader)
		return;

	/* kmalloc should align on a 16 byte boundary..* */
	isolated_loader = kmalloc(size, GFP_KERNEL);
	if (!isolated_loader)
		return;

	memcpy(isolated_loader, loader, size);
	printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
}

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

	ret = -ENODEV;
	if (!spu_management_ops)
		goto out;

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

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

static int __init spufs_init(void)
{
	int ret;

	ret = -ENODEV;
	if (!spu_management_ops)
		goto out;

	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;
	ret = spu_sched_init();
	if (ret)
		goto out_cache;
	ret = register_filesystem(&spufs_type);
	if (ret)
		goto out_sched;
	ret = register_spu_syscalls(&spufs_calls);
	if (ret)
		goto out_fs;
	ret = register_arch_coredump_calls(&spufs_coredump_calls);
	if (ret)
		goto out_syscalls;

	spufs_init_isolated_loader();

	return 0;

out_syscalls:
	unregister_spu_syscalls(&spufs_calls);
out_fs:
	unregister_filesystem(&spufs_type);
out_sched:
	spu_sched_exit();
out_cache:
	kmem_cache_destroy(spufs_inode_cache);
out:
	return ret;
}
module_init(spufs_init);

static void __exit spufs_exit(void)
{
	spu_sched_exit();
	spufs_exit_isolated_loader();
	unregister_arch_coredump_calls(&spufs_coredump_calls);
	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
0afacde3	36	#include <asm/prom.h>
67207b96 AB	37	#include <asm/semaphore.h>
67207b96 AB	38	#include <asm/spu.h>
ccf17e9d	39	#include <asm/spu_priv1.h>
67207b96 AB	40	#include <asm/uaccess.h>
	41
	42	#include "spufs.h"
	43
e18b890b	44	static struct kmem_cache *spufs_inode_cache;
c6730ed4	45	char *isolated_loader;
67207b96	46
67207b96 AB	47	static struct inode *
	48	spufs_alloc_inode(struct super_block *sb)
	49	{
	50	struct spufs_inode_info *ei;
	51
e94b1766	52	ei = kmem_cache_alloc(spufs_inode_cache, GFP_KERNEL);
67207b96 AB	53	if (!ei)
67207b96 AB	54	return NULL;
6263203e AB	55
	56	ei->i_gang = NULL;
	57	ei->i_ctx = NULL;
43c2bbd9	58	ei->i_openers = 0;
6263203e	59
67207b96 AB	60	return &ei->vfs_inode;
	61	}
	62
	63	static void
	64	spufs_destroy_inode(struct inode *inode)
	65	{
	66	kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
	67	}
	68
	69	static void
e18b890b	70	spufs_init_once(void p, struct kmem_cache cachep, unsigned long flags)
67207b96 AB	71	{
	72	struct spufs_inode_info *ei = p;
	73
a35afb83	74	inode_init_once(&ei->vfs_inode);
67207b96 AB	75	}
	76
	77	static struct inode *
	78	spufs_new_inode(struct super_block *sb, int mode)
	79	{
	80	struct inode *inode;
	81
	82	inode = new_inode(sb);
	83	if (!inode)
	84	goto out;
	85
	86	inode->i_mode = mode;
	87	inode->i_uid = current->fsuid;
	88	inode->i_gid = current->fsgid;
67207b96 AB	89	inode->i_blocks = 0;
	90	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	91	out:
	92	return inode;
	93	}
	94
	95	static int
	96	spufs_setattr(struct dentry dentry, struct iattr attr)
	97	{
	98	struct inode *inode = dentry->d_inode;
	99
67207b96 AB	100	if ((attr->ia_valid & ATTR_SIZE) &&
	101	(attr->ia_size != inode->i_size))
	102	return -EINVAL;
	103	return inode_setattr(inode, attr);
	104	}
	105
	106
	107	static int
	108	spufs_new_file(struct super_block sb, struct dentry dentry,
99ac48f5	109	const struct file_operations *fops, int mode,
67207b96 AB	110	struct spu_context *ctx)
	111	{
	112	static struct inode_operations spufs_file_iops = {
67207b96	113	.setattr = spufs_setattr,
67207b96 AB	114	};
	115	struct inode *inode;
	116	int ret;
	117
	118	ret = -ENOSPC;
	119	inode = spufs_new_inode(sb, S_IFREG \| mode);
	120	if (!inode)
	121	goto out;
	122
	123	ret = 0;
	124	inode->i_op = &spufs_file_iops;
	125	inode->i_fop = fops;
8e18e294	126	inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
67207b96 AB	127	d_add(dentry, inode);
	128	out:
	129	return ret;
	130	}
	131
	132	static void
	133	spufs_delete_inode(struct inode *inode)
	134	{
6263203e AB	135	struct spufs_inode_info *ei = SPUFS_I(inode);
	136
	137	if (ei->i_ctx)
	138	put_spu_context(ei->i_ctx);
	139	if (ei->i_gang)
	140	put_spu_gang(ei->i_gang);
67207b96 AB	141	clear_inode(inode);
	142	}
	143
3f51dd91	144	static void spufs_prune_dir(struct dentry *dir)
67207b96	145	{
8b3d6663	146	struct dentry dentry, tmp;
6263203e	147
1b1dcc1b	148	mutex_lock(&dir->d_inode->i_mutex);
c3a9aea7	149	list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
8b3d6663	150	spin_lock(&dcache_lock);
67207b96	151	spin_lock(&dentry->d_lock);
8b3d6663 AB	152	if (!(d_unhashed(dentry)) && dentry->d_inode) {
	153	dget_locked(dentry);
	154	__d_drop(dentry);
	155	spin_unlock(&dentry->d_lock);
3f51dd91	156	simple_unlink(dir->d_inode, dentry);
8b3d6663 AB	157	spin_unlock(&dcache_lock);
	158	dput(dentry);
	159	} else {
	160	spin_unlock(&dentry->d_lock);
	161	spin_unlock(&dcache_lock);
	162	}
67207b96	163	}
3f51dd91	164	shrink_dcache_parent(dir);
1b1dcc1b	165	mutex_unlock(&dir->d_inode->i_mutex);
3f51dd91 AB	166	}
3f51dd91 AB	167
6263203e AB	168	/* Caller must hold parent->i_mutex */
6263203e AB	169	static int spufs_rmdir(struct inode parent, struct dentry dir)
3f51dd91	170	{
3f51dd91	171	/* remove all entries */
6263203e	172	spufs_prune_dir(dir);
8b3d6663	173
6263203e	174	return simple_rmdir(parent, dir);
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	{
87873c86	180	struct dentry dentry, tmp;
3f51dd91 AB	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:
87873c86 SS	196	/*
	197	* remove all children from dir. dir->inode is not set so don't
	198	* just simply use spufs_prune_dir() and panic afterwards :)
	199	* dput() looks like it will do the right thing:
	200	* - dec parent's ref counter
	201	* - remove child from parent's child list
	202	* - free child's inode if possible
	203	* - free child
	204	*/
	205	list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
	206	dput(dentry);
	207	}
	208
	209	shrink_dcache_parent(dir);
3f51dd91 AB	210	return ret;
	211	}
	212
67207b96 AB	213	static int spufs_dir_close(struct inode inode, struct file file)
67207b96 AB	214	{
0309f02d	215	struct spu_context *ctx;
6263203e AB	216	struct inode *parent;
6263203e AB	217	struct dentry *dir;
67207b96 AB	218	int ret;
67207b96 AB	219
b4d1ab58	220	dir = file->f_path.dentry;
6263203e AB	221	parent = dir->d_parent->d_inode;
6263203e AB	222	ctx = SPUFS_I(dir->d_inode)->i_ctx;
c8ca0633	223
6263203e AB	224	mutex_lock(&parent->i_mutex);
	225	ret = spufs_rmdir(parent, dir);
	226	mutex_unlock(&parent->i_mutex);
67207b96	227	WARN_ON(ret);
c8ca0633	228
0309f02d ME	229	/* We have to give up the mm_struct */
	230	spu_forget(ctx);
	231
67207b96 AB	232	return dcache_dir_close(inode, file);
	233	}
	234
754661f1	235	const struct inode_operations spufs_dir_inode_operations = {
67207b96 AB	236	.lookup = simple_lookup,
	237	};
	238
5dfe4c96	239	const struct file_operations spufs_context_fops = {
67207b96 AB	240	.open = dcache_dir_open,
	241	.release = spufs_dir_close,
	242	.llseek = dcache_dir_lseek,
	243	.read = generic_read_dir,
	244	.readdir = dcache_readdir,
	245	.fsync = simple_sync_file,
	246	};
bf1ab978	247	EXPORT_SYMBOL_GPL(spufs_context_fops);
67207b96 AB	248
67207b96 AB	249	static int
9add11da AB	250	spufs_mkdir(struct inode dir, struct dentry dentry, unsigned int flags,
9add11da AB	251	int mode)
67207b96 AB	252	{
	253	int ret;
	254	struct inode *inode;
	255	struct spu_context *ctx;
	256
	257	ret = -ENOSPC;
	258	inode = spufs_new_inode(dir->i_sb, mode \| S_IFDIR);
	259	if (!inode)
	260	goto out;
	261
	262	if (dir->i_mode & S_ISGID) {
	263	inode->i_gid = dir->i_gid;
	264	inode->i_mode &= S_ISGID;
	265	}
6263203e	266	ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
67207b96 AB	267	SPUFS_I(inode)->i_ctx = ctx;
	268	if (!ctx)
	269	goto out_iput;
	270
9add11da	271	ctx->flags = flags;
67207b96 AB	272	inode->i_op = &spufs_dir_inode_operations;
67207b96 AB	273	inode->i_fop = &simple_dir_operations;
5737edd1 MN	274	if (flags & SPU_CREATE_NOSCHED)
	275	ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
	276	mode, ctx);
	277	else
	278	ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
	279
67207b96 AB	280	if (ret)
	281	goto out_free_ctx;
	282
	283	d_instantiate(dentry, inode);
	284	dget(dentry);
	285	dir->i_nlink++;
346f4d3c	286	dentry->d_inode->i_nlink++;
67207b96 AB	287	goto out;
	288
	289	out_free_ctx:
89df0085	290	spu_forget(ctx);
67207b96 AB	291	put_spu_context(ctx);
	292	out_iput:
	293	iput(inode);
	294	out:
	295	return ret;
	296	}
	297
346f4d3c AB	298	static int spufs_context_open(struct dentry dentry, struct vfsmount mnt)
	299	{
	300	int ret;
	301	struct file *filp;
	302
	303	ret = get_unused_fd();
	304	if (ret < 0) {
	305	dput(dentry);
	306	mntput(mnt);
	307	goto out;
	308	}
	309
	310	filp = dentry_open(dentry, mnt, O_RDONLY);
	311	if (IS_ERR(filp)) {
	312	put_unused_fd(ret);
	313	ret = PTR_ERR(filp);
	314	goto out;
	315	}
	316
	317	filp->f_op = &spufs_context_fops;
	318	fd_install(ret, filp);
	319	out:
	320	return ret;
	321	}
	322
6263203e AB	323	static int spufs_create_context(struct inode *inode,
	324	struct dentry *dentry,
	325	struct vfsmount *mnt, int flags, int mode)
	326	{
	327	int ret;
	328
5737edd1 MN	329	ret = -EPERM;
	330	if ((flags & SPU_CREATE_NOSCHED) &&
	331	!capable(CAP_SYS_NICE))
	332	goto out_unlock;
	333
	334	ret = -EINVAL;
	335	if ((flags & (SPU_CREATE_NOSCHED \| SPU_CREATE_ISOLATE))
	336	== SPU_CREATE_ISOLATE)
	337	goto out_unlock;
	338
bd2e5f82 JK	339	ret = -ENODEV;
	340	if ((flags & SPU_CREATE_ISOLATE) && !isolated_loader)
	341	goto out_unlock;
	342
6263203e AB	343	ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
	344	if (ret)
	345	goto out_unlock;
	346
	347	/*
	348	* get references for dget and mntget, will be released
	349	* in error path of *_open().
	350	*/
	351	ret = spufs_context_open(dget(dentry), mntget(mnt));
	352	if (ret < 0) {
	353	WARN_ON(spufs_rmdir(inode, dentry));
	354	mutex_unlock(&inode->i_mutex);
	355	spu_forget(SPUFS_I(dentry->d_inode)->i_ctx);
	356	goto out;
	357	}
	358
	359	out_unlock:
	360	mutex_unlock(&inode->i_mutex);
	361	out:
	362	dput(dentry);
	363	return ret;
	364	}
	365
6263203e AB	366	static int
	367	spufs_mkgang(struct inode dir, struct dentry dentry, int mode)
	368	{
	369	int ret;
	370	struct inode *inode;
	371	struct spu_gang *gang;
	372
	373	ret = -ENOSPC;
	374	inode = spufs_new_inode(dir->i_sb, mode \| S_IFDIR);
	375	if (!inode)
	376	goto out;
	377
	378	ret = 0;
	379	if (dir->i_mode & S_ISGID) {
	380	inode->i_gid = dir->i_gid;
	381	inode->i_mode &= S_ISGID;
	382	}
	383	gang = alloc_spu_gang();
	384	SPUFS_I(inode)->i_ctx = NULL;
	385	SPUFS_I(inode)->i_gang = gang;
	386	if (!gang)
	387	goto out_iput;
	388
	389	inode->i_op = &spufs_dir_inode_operations;
	390	inode->i_fop = &simple_dir_operations;
	391
	392	d_instantiate(dentry, inode);
6263203e AB	393	dir->i_nlink++;
	394	dentry->d_inode->i_nlink++;
	395	return ret;
	396
	397	out_iput:
	398	iput(inode);
	399	out:
	400	return ret;
	401	}
	402
	403	static int spufs_gang_open(struct dentry dentry, struct vfsmount mnt)
	404	{
	405	int ret;
	406	struct file *filp;
	407
	408	ret = get_unused_fd();
	409	if (ret < 0) {
	410	dput(dentry);
	411	mntput(mnt);
	412	goto out;
	413	}
	414
	415	filp = dentry_open(dentry, mnt, O_RDONLY);
	416	if (IS_ERR(filp)) {
	417	put_unused_fd(ret);
	418	ret = PTR_ERR(filp);
	419	goto out;
	420	}
	421
877907d3	422	filp->f_op = &simple_dir_operations;
6263203e AB	423	fd_install(ret, filp);
	424	out:
	425	return ret;
	426	}
	427
	428	static int spufs_create_gang(struct inode *inode,
	429	struct dentry *dentry,
	430	struct vfsmount *mnt, int mode)
	431	{
	432	int ret;
	433
	434	ret = spufs_mkgang(inode, dentry, mode & S_IRWXUGO);
	435	if (ret)
	436	goto out;
	437
	438	/*
	439	* get references for dget and mntget, will be released
	440	* in error path of *_open().
	441	*/
	442	ret = spufs_gang_open(dget(dentry), mntget(mnt));
877907d3 JK	443	if (ret < 0) {
	444	int err = simple_rmdir(inode, dentry);
	445	WARN_ON(err);
	446	}
6263203e AB	447
	448	out:
	449	mutex_unlock(&inode->i_mutex);
	450	dput(dentry);
	451	return ret;
	452	}
	453
	454
346f4d3c AB	455	static struct file_system_type spufs_type;
346f4d3c AB	456
6263203e	457	long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode)
67207b96 AB	458	{
67207b96 AB	459	struct dentry *dentry;
67207b96 AB	460	int ret;
67207b96 AB	461
67207b96	462	ret = -EINVAL;
6263203e AB	463	/* check if we are on spufs */
6263203e AB	464	if (nd->dentry->d_sb->s_type != &spufs_type)
67207b96 AB	465	goto out;
67207b96 AB	466
6263203e	467	/* don't accept undefined flags */
9add11da	468	if (flags & (~SPU_CREATE_FLAG_ALL))
c9832948	469	goto out;
c9832948	470
6263203e AB	471	/* only threads can be underneath a gang */
	472	if (nd->dentry != nd->dentry->d_sb->s_root) {
	473	if ((flags & SPU_CREATE_GANG) \|\|
	474	!SPUFS_I(nd->dentry->d_inode)->i_gang)
	475	goto out;
	476	}
	477
67207b96 AB	478	dentry = lookup_create(nd, 1);
	479	ret = PTR_ERR(dentry);
	480	if (IS_ERR(dentry))
	481	goto out_dir;
	482
	483	ret = -EEXIST;
	484	if (dentry->d_inode)
	485	goto out_dput;
	486
	487	mode &= ~current->fs->umask;
67207b96	488
6263203e AB	489	if (flags & SPU_CREATE_GANG)
	490	return spufs_create_gang(nd->dentry->d_inode,
	491	dentry, nd->mnt, mode);
	492	else
	493	return spufs_create_context(nd->dentry->d_inode,
	494	dentry, nd->mnt, flags, mode);
67207b96 AB	495
	496	out_dput:
	497	dput(dentry);
	498	out_dir:
1b1dcc1b	499	mutex_unlock(&nd->dentry->d_inode->i_mutex);
67207b96 AB	500	out:
	501	return ret;
	502	}
	503
	504	/* File system initialization */
	505	enum {
f11f5ee7	506	Opt_uid, Opt_gid, Opt_mode, Opt_err,
67207b96 AB	507	};
	508
	509	static match_table_t spufs_tokens = {
f11f5ee7 JK	510	{ Opt_uid, "uid=%d" },
	511	{ Opt_gid, "gid=%d" },
	512	{ Opt_mode, "mode=%o" },
	513	{ Opt_err, NULL },
67207b96 AB	514	};
	515
	516	static int
	517	spufs_parse_options(char options, struct inode root)
	518	{
	519	char *p;
	520	substring_t args[MAX_OPT_ARGS];
	521
	522	while ((p = strsep(&options, ",")) != NULL) {
	523	int token, option;
	524
	525	if (!*p)
	526	continue;
	527
	528	token = match_token(p, spufs_tokens, args);
	529	switch (token) {
	530	case Opt_uid:
	531	if (match_int(&args[0], &option))
	532	return 0;
	533	root->i_uid = option;
	534	break;
	535	case Opt_gid:
	536	if (match_int(&args[0], &option))
	537	return 0;
	538	root->i_gid = option;
	539	break;
f11f5ee7 JK	540	case Opt_mode:
	541	if (match_octal(&args[0], &option))
	542	return 0;
	543	root->i_mode = option \| S_IFDIR;
	544	break;
67207b96 AB	545	default:
	546	return 0;
	547	}
	548	}
	549	return 1;
	550	}
	551
db1384b4 AM	552	static void spufs_exit_isolated_loader(void)
	553	{
	554	kfree(isolated_loader);
	555	}
	556
0afacde3	557	static void
	558	spufs_init_isolated_loader(void)
	559	{
	560	struct device_node *dn;
	561	const char *loader;
	562	int size;
	563
	564	dn = of_find_node_by_path("/spu-isolation");
	565	if (!dn)
	566	return;
	567
e2eb6392	568	loader = of_get_property(dn, "loader", &size);
0afacde3	569	if (!loader)
	570	return;
	571
	572	/* kmalloc should align on a 16 byte boundary..* */
	573	isolated_loader = kmalloc(size, GFP_KERNEL);
	574	if (!isolated_loader)
	575	return;
	576
	577	memcpy(isolated_loader, loader, size);
	578	printk(KERN_INFO "spufs: SPU isolation mode enabled\n");
	579	}
	580
67207b96	581	static int
8b3d6663 AB	582	spufs_create_root(struct super_block sb, void data)
8b3d6663 AB	583	{
67207b96 AB	584	struct inode *inode;
	585	int ret;
	586
8f18a158 AB	587	ret = -ENODEV;
	588	if (!spu_management_ops)
	589	goto out;
	590
67207b96 AB	591	ret = -ENOMEM;
	592	inode = spufs_new_inode(sb, S_IFDIR \| 0775);
	593	if (!inode)
	594	goto out;
	595
	596	inode->i_op = &spufs_dir_inode_operations;
	597	inode->i_fop = &simple_dir_operations;
	598	SPUFS_I(inode)->i_ctx = NULL;
	599
	600	ret = -EINVAL;
	601	if (!spufs_parse_options(data, inode))
	602	goto out_iput;
	603
	604	ret = -ENOMEM;
	605	sb->s_root = d_alloc_root(inode);
	606	if (!sb->s_root)
	607	goto out_iput;
	608
	609	return 0;
	610	out_iput:
	611	iput(inode);
	612	out:
	613	return ret;
	614	}
	615
	616	static int
	617	spufs_fill_super(struct super_block sb, void data, int silent)
	618	{
	619	static struct super_operations s_ops = {
	620	.alloc_inode = spufs_alloc_inode,
	621	.destroy_inode = spufs_destroy_inode,
	622	.statfs = simple_statfs,
	623	.delete_inode = spufs_delete_inode,
	624	.drop_inode = generic_delete_inode,
	625	};
	626
	627	sb->s_maxbytes = MAX_LFS_FILESIZE;
	628	sb->s_blocksize = PAGE_CACHE_SIZE;
	629	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	630	sb->s_magic = SPUFS_MAGIC;
	631	sb->s_op = &s_ops;
	632
	633	return spufs_create_root(sb, data);
	634	}
	635
454e2398	636	static int
67207b96	637	spufs_get_sb(struct file_system_type *fstype, int flags,
454e2398	638	const char name, void data, struct vfsmount *mnt)
67207b96	639	{
454e2398	640	return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
67207b96 AB	641	}
	642
	643	static struct file_system_type spufs_type = {
	644	.owner = THIS_MODULE,
	645	.name = "spufs",
	646	.get_sb = spufs_get_sb,
	647	.kill_sb = kill_litter_super,
	648	};
	649
e78b47a5	650	static int __init spufs_init(void)
67207b96 AB	651	{
67207b96 AB	652	int ret;
bf1ab978	653
ccf17e9d JK	654	ret = -ENODEV;
	655	if (!spu_management_ops)
	656	goto out;
	657
67207b96 AB	658	ret = -ENOMEM;
	659	spufs_inode_cache = kmem_cache_create("spufs_inode_cache",
	660	sizeof(struct spufs_inode_info), 0,
	661	SLAB_HWCACHE_ALIGN, spufs_init_once, NULL);
	662
	663	if (!spufs_inode_cache)
	664	goto out;
c99c1994	665	ret = spu_sched_init();
67207b96 AB	666	if (ret)
67207b96 AB	667	goto out_cache;
c99c1994 AM	668	ret = register_filesystem(&spufs_type);
	669	if (ret)
	670	goto out_sched;
67207b96	671	ret = register_spu_syscalls(&spufs_calls);
bf1ab978 DGM	672	if (ret)
	673	goto out_fs;
	674	ret = register_arch_coredump_calls(&spufs_coredump_calls);
67207b96	675	if (ret)
c99c1994	676	goto out_syscalls;
0afacde3	677
0afacde3	678	spufs_init_isolated_loader();
bf1ab978	679
67207b96	680	return 0;
c99c1994 AM	681
	682	out_syscalls:
	683	unregister_spu_syscalls(&spufs_calls);
67207b96 AB	684	out_fs:
67207b96 AB	685	unregister_filesystem(&spufs_type);
c99c1994 AM	686	out_sched:
c99c1994 AM	687	spu_sched_exit();
67207b96 AB	688	out_cache:
	689	kmem_cache_destroy(spufs_inode_cache);
	690	out:
	691	return ret;
	692	}
	693	module_init(spufs_init);
	694
e78b47a5	695	static void __exit spufs_exit(void)
67207b96	696	{
8b3d6663	697	spu_sched_exit();
db1384b4	698	spufs_exit_isolated_loader();
bf1ab978	699	unregister_arch_coredump_calls(&spufs_coredump_calls);
67207b96 AB	700	unregister_spu_syscalls(&spufs_calls);
	701	unregister_filesystem(&spufs_type);
	702	kmem_cache_destroy(spufs_inode_cache);
	703	}
	704	module_exit(spufs_exit);
	705
	706	MODULE_LICENSE("GPL");
	707	MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
	708