[linux-2.6-block.git] / drivers / infiniband / hw / ipath / ipath_fs.c

/*
 * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
 * Copyright (c) 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/namei.h>
#include <linux/slab.h>

#include "ipath_kernel.h"

#define IPATHFS_MAGIC 0x726a77

static struct super_block *ipath_super;

static int ipathfs_mknod(struct inode *dir, struct dentry *dentry,
			 int mode, const struct file_operations *fops,
			 void *data)
{
	int error;
	struct inode *inode = new_inode(dir->i_sb);

	if (!inode) {
		error = -EPERM;
		goto bail;
	}

	inode->i_mode = mode;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	inode->i_private = data;
	if ((mode & S_IFMT) == S_IFDIR) {
		inode->i_op = &simple_dir_inode_operations;
		inc_nlink(inode);
		inc_nlink(dir);
	}

	inode->i_fop = fops;

	d_instantiate(dentry, inode);
	error = 0;

bail:
	return error;
}

static int create_file(const char *name, mode_t mode,
		       struct dentry *parent, struct dentry **dentry,
		       const struct file_operations *fops, void *data)
{
	int error;

	*dentry = NULL;
	mutex_lock(&parent->d_inode->i_mutex);
	*dentry = lookup_one_len(name, parent, strlen(name));
	if (!IS_ERR(*dentry))
		error = ipathfs_mknod(parent->d_inode, *dentry,
				      mode, fops, data);
	else
		error = PTR_ERR(dentry);
	mutex_unlock(&parent->d_inode->i_mutex);

	return error;
}

static ssize_t atomic_stats_read(struct file *file, char __user *buf,
				 size_t count, loff_t *ppos)
{
	return simple_read_from_buffer(buf, count, ppos, &ipath_stats,
				       sizeof ipath_stats);
}

static const struct file_operations atomic_stats_ops = {
	.read = atomic_stats_read,
	.llseek = default_llseek,
};

static ssize_t atomic_counters_read(struct file *file, char __user *buf,
				    size_t count, loff_t *ppos)
{
	struct infinipath_counters counters;
	struct ipath_devdata *dd;

	dd = file->f_path.dentry->d_inode->i_private;
	dd->ipath_f_read_counters(dd, &counters);

	return simple_read_from_buffer(buf, count, ppos, &counters,
				       sizeof counters);
}

static const struct file_operations atomic_counters_ops = {
	.read = atomic_counters_read,
	.llseek = default_llseek,
};

static ssize_t flash_read(struct file *file, char __user *buf,
			  size_t count, loff_t *ppos)
{
	struct ipath_devdata *dd;
	ssize_t ret;
	loff_t pos;
	char *tmp;

	pos = *ppos;

	if ( pos < 0) {
		ret = -EINVAL;
		goto bail;
	}

	if (pos >= sizeof(struct ipath_flash)) {
		ret = 0;
		goto bail;
	}

	if (count > sizeof(struct ipath_flash) - pos)
		count = sizeof(struct ipath_flash) - pos;

	tmp = kmalloc(count, GFP_KERNEL);
	if (!tmp) {
		ret = -ENOMEM;
		goto bail;
	}

	dd = file->f_path.dentry->d_inode->i_private;
	if (ipath_eeprom_read(dd, pos, tmp, count)) {
		ipath_dev_err(dd, "failed to read from flash\n");
		ret = -ENXIO;
		goto bail_tmp;
	}

	if (copy_to_user(buf, tmp, count)) {
		ret = -EFAULT;
		goto bail_tmp;
	}

	*ppos = pos + count;
	ret = count;

bail_tmp:
	kfree(tmp);

bail:
	return ret;
}

static ssize_t flash_write(struct file *file, const char __user *buf,
			   size_t count, loff_t *ppos)
{
	struct ipath_devdata *dd;
	ssize_t ret;
	loff_t pos;
	char *tmp;

	pos = *ppos;

	if (pos != 0) {
		ret = -EINVAL;
		goto bail;
	}

	if (count != sizeof(struct ipath_flash)) {
		ret = -EINVAL;
		goto bail;
	}

	tmp = kmalloc(count, GFP_KERNEL);
	if (!tmp) {
		ret = -ENOMEM;
		goto bail;
	}

	if (copy_from_user(tmp, buf, count)) {
		ret = -EFAULT;
		goto bail_tmp;
	}

	dd = file->f_path.dentry->d_inode->i_private;
	if (ipath_eeprom_write(dd, pos, tmp, count)) {
		ret = -ENXIO;
		ipath_dev_err(dd, "failed to write to flash\n");
		goto bail_tmp;
	}

	*ppos = pos + count;
	ret = count;

bail_tmp:
	kfree(tmp);

bail:
	return ret;
}

static const struct file_operations flash_ops = {
	.read = flash_read,
	.write = flash_write,
	.llseek = default_llseek,
};

static int create_device_files(struct super_block *sb,
			       struct ipath_devdata *dd)
{
	struct dentry *dir, *tmp;
	char unit[10];
	int ret;

	snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
	ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
			  &simple_dir_operations, dd);
	if (ret) {
		printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
		goto bail;
	}

	ret = create_file("atomic_counters", S_IFREG|S_IRUGO, dir, &tmp,
			  &atomic_counters_ops, dd);
	if (ret) {
		printk(KERN_ERR "create_file(%s/atomic_counters) "
		       "failed: %d\n", unit, ret);
		goto bail;
	}

	ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
			  &flash_ops, dd);
	if (ret) {
		printk(KERN_ERR "create_file(%s/flash) "
		       "failed: %d\n", unit, ret);
		goto bail;
	}

bail:
	return ret;
}

static int remove_file(struct dentry *parent, char *name)
{
	struct dentry *tmp;
	int ret;

	tmp = lookup_one_len(name, parent, strlen(name));

	if (IS_ERR(tmp)) {
		ret = PTR_ERR(tmp);
		goto bail;
	}

	spin_lock(&dcache_lock);
	spin_lock(&tmp->d_lock);
	if (!(d_unhashed(tmp) && tmp->d_inode)) {
		dget_locked(tmp);
		__d_drop(tmp);
		spin_unlock(&tmp->d_lock);
		spin_unlock(&dcache_lock);
		simple_unlink(parent->d_inode, tmp);
	} else {
		spin_unlock(&tmp->d_lock);
		spin_unlock(&dcache_lock);
	}

	ret = 0;
bail:
	/*
	 * We don't expect clients to care about the return value, but
	 * it's there if they need it.
	 */
	return ret;
}

static int remove_device_files(struct super_block *sb,
			       struct ipath_devdata *dd)
{
	struct dentry *dir, *root;
	char unit[10];
	int ret;

	root = dget(sb->s_root);
	mutex_lock(&root->d_inode->i_mutex);
	snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
	dir = lookup_one_len(unit, root, strlen(unit));

	if (IS_ERR(dir)) {
		ret = PTR_ERR(dir);
		printk(KERN_ERR "Lookup of %s failed\n", unit);
		goto bail;
	}

	remove_file(dir, "flash");
	remove_file(dir, "atomic_counters");
	d_delete(dir);
	ret = simple_rmdir(root->d_inode, dir);

bail:
	mutex_unlock(&root->d_inode->i_mutex);
	dput(root);
	return ret;
}

static int ipathfs_fill_super(struct super_block *sb, void *data,
			      int silent)
{
	struct ipath_devdata *dd, *tmp;
	unsigned long flags;
	int ret;

	static struct tree_descr files[] = {
		[2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
		{""},
	};

	ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
	if (ret) {
		printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
		goto bail;
	}

	spin_lock_irqsave(&ipath_devs_lock, flags);

	list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
		spin_unlock_irqrestore(&ipath_devs_lock, flags);
		ret = create_device_files(sb, dd);
		if (ret)
			goto bail;
		spin_lock_irqsave(&ipath_devs_lock, flags);
	}

	spin_unlock_irqrestore(&ipath_devs_lock, flags);

bail:
	return ret;
}

static int ipathfs_get_sb(struct file_system_type *fs_type, int flags,
			const char *dev_name, void *data, struct vfsmount *mnt)
{
	int ret = get_sb_single(fs_type, flags, data,
				    ipathfs_fill_super, mnt);
	if (ret >= 0)
		ipath_super = mnt->mnt_sb;
	return ret;
}

static void ipathfs_kill_super(struct super_block *s)
{
	kill_litter_super(s);
	ipath_super = NULL;
}

int ipathfs_add_device(struct ipath_devdata *dd)
{
	int ret;

	if (ipath_super == NULL) {
		ret = 0;
		goto bail;
	}

	ret = create_device_files(ipath_super, dd);

bail:
	return ret;
}

int ipathfs_remove_device(struct ipath_devdata *dd)
{
	int ret;

	if (ipath_super == NULL) {
		ret = 0;
		goto bail;
	}

	ret = remove_device_files(ipath_super, dd);

bail:
	return ret;
}

static struct file_system_type ipathfs_fs_type = {
	.owner =	THIS_MODULE,
	.name =		"ipathfs",
	.get_sb =	ipathfs_get_sb,
	.kill_sb =	ipathfs_kill_super,
};

int __init ipath_init_ipathfs(void)
{
	return register_filesystem(&ipathfs_fs_type);
}

void __exit ipath_exit_ipathfs(void)
{
	unregister_filesystem(&ipathfs_fs_type);
}
Commit	Line	Data
3e9b4a5e	1	/*
87427da5	2	* Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
3e9b4a5e BS	3	* Copyright (c) 2006 PathScale, Inc. All rights reserved.
	4	*
	5	* This software is available to you under a choice of one of two
	6	* licenses. You may choose to be licensed under the terms of the GNU
	7	* General Public License (GPL) Version 2, available from the file
	8	* COPYING in the main directory of this source tree, or the
	9	* OpenIB.org BSD license below:
	10	*
	11	* Redistribution and use in source and binary forms, with or
	12	* without modification, are permitted provided that the following
	13	* conditions are met:
	14	*
	15	* - Redistributions of source code must retain the above
	16	* copyright notice, this list of conditions and the following
	17	* disclaimer.
	18	*
	19	* - Redistributions in binary form must reproduce the above
	20	* copyright notice, this list of conditions and the following
	21	* disclaimer in the documentation and/or other materials
	22	* provided with the distribution.
	23	*
	24	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	25	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	26	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	27	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	28	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	29	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	30	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	31	* SOFTWARE.
	32	*/
	33
3e9b4a5e BS	34	#include <linux/module.h>
	35	#include <linux/fs.h>
	36	#include <linux/mount.h>
	37	#include <linux/pagemap.h>
	38	#include <linux/init.h>
	39	#include <linux/namei.h>
5a0e3ad6	40	#include <linux/slab.h>
3e9b4a5e BS	41
	42	#include "ipath_kernel.h"
	43
	44	#define IPATHFS_MAGIC 0x726a77
	45
	46	static struct super_block *ipath_super;
	47
	48	static int ipathfs_mknod(struct inode dir, struct dentry dentry,
2b8693c0	49	int mode, const struct file_operations *fops,
3e9b4a5e BS	50	void *data)
	51	{
	52	int error;
	53	struct inode *inode = new_inode(dir->i_sb);
	54
	55	if (!inode) {
	56	error = -EPERM;
	57	goto bail;
	58	}
	59
	60	inode->i_mode = mode;
3e9b4a5e	61	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
8e18e294	62	inode->i_private = data;
3e9b4a5e BS	63	if ((mode & S_IFMT) == S_IFDIR) {
3e9b4a5e BS	64	inode->i_op = &simple_dir_inode_operations;
d8c76e6f DH	65	inc_nlink(inode);
d8c76e6f DH	66	inc_nlink(dir);
3e9b4a5e BS	67	}
	68
	69	inode->i_fop = fops;
	70
	71	d_instantiate(dentry, inode);
	72	error = 0;
	73
	74	bail:
	75	return error;
	76	}
	77
	78	static int create_file(const char *name, mode_t mode,
	79	struct dentry parent, struct dentry *dentry,
2b8693c0	80	const struct file_operations fops, void data)
3e9b4a5e BS	81	{
	82	int error;
	83
	84	*dentry = NULL;
	85	mutex_lock(&parent->d_inode->i_mutex);
	86	*dentry = lookup_one_len(name, parent, strlen(name));
64f22fa1	87	if (!IS_ERR(*dentry))
3e9b4a5e BS	88	error = ipathfs_mknod(parent->d_inode, *dentry,
	89	mode, fops, data);
	90	else
	91	error = PTR_ERR(dentry);
	92	mutex_unlock(&parent->d_inode->i_mutex);
	93
	94	return error;
	95	}
	96
	97	static ssize_t atomic_stats_read(struct file file, char __user buf,
	98	size_t count, loff_t *ppos)
	99	{
	100	return simple_read_from_buffer(buf, count, ppos, &ipath_stats,
	101	sizeof ipath_stats);
	102	}
	103
2b8693c0	104	static const struct file_operations atomic_stats_ops = {
3e9b4a5e	105	.read = atomic_stats_read,
6038f373	106	.llseek = default_llseek,
3e9b4a5e BS	107	};
3e9b4a5e BS	108
3e9b4a5e BS	109	static ssize_t atomic_counters_read(struct file file, char __user buf,
	110	size_t count, loff_t *ppos)
	111	{
3029fcc3	112	struct infinipath_counters counters;
3e9b4a5e BS	113	struct ipath_devdata *dd;
3e9b4a5e BS	114
1cfd6e64	115	dd = file->f_path.dentry->d_inode->i_private;
3029fcc3	116	dd->ipath_f_read_counters(dd, &counters);
3e9b4a5e	117
3029fcc3	118	return simple_read_from_buffer(buf, count, ppos, &counters,
3e9b4a5e BS	119	sizeof counters);
	120	}
	121
2b8693c0	122	static const struct file_operations atomic_counters_ops = {
3e9b4a5e	123	.read = atomic_counters_read,
6038f373	124	.llseek = default_llseek,
3e9b4a5e BS	125	};
3e9b4a5e BS	126
3e9b4a5e BS	127	static ssize_t flash_read(struct file file, char __user buf,
	128	size_t count, loff_t *ppos)
	129	{
	130	struct ipath_devdata *dd;
	131	ssize_t ret;
	132	loff_t pos;
	133	char *tmp;
	134
	135	pos = *ppos;
	136
	137	if ( pos < 0) {
	138	ret = -EINVAL;
	139	goto bail;
	140	}
	141
	142	if (pos >= sizeof(struct ipath_flash)) {
	143	ret = 0;
	144	goto bail;
	145	}
	146
	147	if (count > sizeof(struct ipath_flash) - pos)
	148	count = sizeof(struct ipath_flash) - pos;
	149
	150	tmp = kmalloc(count, GFP_KERNEL);
	151	if (!tmp) {
	152	ret = -ENOMEM;
	153	goto bail;
	154	}
	155
1cfd6e64	156	dd = file->f_path.dentry->d_inode->i_private;
3e9b4a5e BS	157	if (ipath_eeprom_read(dd, pos, tmp, count)) {
	158	ipath_dev_err(dd, "failed to read from flash\n");
	159	ret = -ENXIO;
	160	goto bail_tmp;
	161	}
	162
	163	if (copy_to_user(buf, tmp, count)) {
	164	ret = -EFAULT;
	165	goto bail_tmp;
	166	}
	167
	168	*ppos = pos + count;
	169	ret = count;
	170
	171	bail_tmp:
	172	kfree(tmp);
	173
	174	bail:
	175	return ret;
	176	}
	177
	178	static ssize_t flash_write(struct file file, const char __user buf,
	179	size_t count, loff_t *ppos)
	180	{
	181	struct ipath_devdata *dd;
	182	ssize_t ret;
	183	loff_t pos;
	184	char *tmp;
	185
	186	pos = *ppos;
	187
7dae5bff	188	if (pos != 0) {
3e9b4a5e BS	189	ret = -EINVAL;
	190	goto bail;
	191	}
	192
7dae5bff BS	193	if (count != sizeof(struct ipath_flash)) {
7dae5bff BS	194	ret = -EINVAL;
3e9b4a5e BS	195	goto bail;
	196	}
	197
3e9b4a5e BS	198	tmp = kmalloc(count, GFP_KERNEL);
	199	if (!tmp) {
	200	ret = -ENOMEM;
	201	goto bail;
	202	}
	203
	204	if (copy_from_user(tmp, buf, count)) {
	205	ret = -EFAULT;
	206	goto bail_tmp;
	207	}
	208
1cfd6e64	209	dd = file->f_path.dentry->d_inode->i_private;
3e9b4a5e BS	210	if (ipath_eeprom_write(dd, pos, tmp, count)) {
	211	ret = -ENXIO;
	212	ipath_dev_err(dd, "failed to write to flash\n");
	213	goto bail_tmp;
	214	}
	215
	216	*ppos = pos + count;
	217	ret = count;
	218
	219	bail_tmp:
	220	kfree(tmp);
	221
	222	bail:
	223	return ret;
	224	}
	225
2b8693c0	226	static const struct file_operations flash_ops = {
3e9b4a5e BS	227	.read = flash_read,
3e9b4a5e BS	228	.write = flash_write,
6038f373	229	.llseek = default_llseek,
3e9b4a5e BS	230	};
	231
	232	static int create_device_files(struct super_block *sb,
	233	struct ipath_devdata *dd)
	234	{
	235	struct dentry dir, tmp;
	236	char unit[10];
	237	int ret;
	238
	239	snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
	240	ret = create_file(unit, S_IFDIR\|S_IRUGO\|S_IXUGO, sb->s_root, &dir,
f7fca1e8	241	&simple_dir_operations, dd);
3e9b4a5e BS	242	if (ret) {
	243	printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
	244	goto bail;
	245	}
	246
	247	ret = create_file("atomic_counters", S_IFREG\|S_IRUGO, dir, &tmp,
	248	&atomic_counters_ops, dd);
	249	if (ret) {
	250	printk(KERN_ERR "create_file(%s/atomic_counters) "
	251	"failed: %d\n", unit, ret);
	252	goto bail;
	253	}
	254
3e9b4a5e BS	255	ret = create_file("flash", S_IFREG\|S_IWUSR\|S_IRUGO, dir, &tmp,
	256	&flash_ops, dd);
	257	if (ret) {
	258	printk(KERN_ERR "create_file(%s/flash) "
	259	"failed: %d\n", unit, ret);
	260	goto bail;
	261	}
	262
	263	bail:
	264	return ret;
	265	}
	266
fae8773b	267	static int remove_file(struct dentry parent, char name)
3e9b4a5e BS	268	{
3e9b4a5e BS	269	struct dentry *tmp;
fae8773b	270	int ret;
3e9b4a5e BS	271
	272	tmp = lookup_one_len(name, parent, strlen(name));
	273
fae8773b BS	274	if (IS_ERR(tmp)) {
	275	ret = PTR_ERR(tmp);
	276	goto bail;
	277	}
	278
3e9b4a5e BS	279	spin_lock(&dcache_lock);
	280	spin_lock(&tmp->d_lock);
	281	if (!(d_unhashed(tmp) && tmp->d_inode)) {
	282	dget_locked(tmp);
	283	__d_drop(tmp);
	284	spin_unlock(&tmp->d_lock);
	285	spin_unlock(&dcache_lock);
	286	simple_unlink(parent->d_inode, tmp);
	287	} else {
	288	spin_unlock(&tmp->d_lock);
	289	spin_unlock(&dcache_lock);
	290	}
fae8773b BS	291
	292	ret = 0;
	293	bail:
	294	/*
	295	* We don't expect clients to care about the return value, but
	296	* it's there if they need it.
	297	*/
	298	return ret;
3e9b4a5e BS	299	}
	300
	301	static int remove_device_files(struct super_block *sb,
	302	struct ipath_devdata *dd)
	303	{
	304	struct dentry dir, root;
	305	char unit[10];
	306	int ret;
	307
	308	root = dget(sb->s_root);
	309	mutex_lock(&root->d_inode->i_mutex);
	310	snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
	311	dir = lookup_one_len(unit, root, strlen(unit));
	312
	313	if (IS_ERR(dir)) {
	314	ret = PTR_ERR(dir);
	315	printk(KERN_ERR "Lookup of %s failed\n", unit);
	316	goto bail;
	317	}
	318
	319	remove_file(dir, "flash");
3e9b4a5e BS	320	remove_file(dir, "atomic_counters");
	321	d_delete(dir);
	322	ret = simple_rmdir(root->d_inode, dir);
	323
	324	bail:
	325	mutex_unlock(&root->d_inode->i_mutex);
	326	dput(root);
	327	return ret;
	328	}
	329
	330	static int ipathfs_fill_super(struct super_block sb, void data,
	331	int silent)
	332	{
	333	struct ipath_devdata dd, tmp;
	334	unsigned long flags;
	335	int ret;
	336
	337	static struct tree_descr files[] = {
1a1c9bb4	338	[2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
3e9b4a5e BS	339	{""},
	340	};
	341
	342	ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
	343	if (ret) {
	344	printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
	345	goto bail;
	346	}
	347
	348	spin_lock_irqsave(&ipath_devs_lock, flags);
	349
	350	list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
	351	spin_unlock_irqrestore(&ipath_devs_lock, flags);
	352	ret = create_device_files(sb, dd);
12e9a456	353	if (ret)
3e9b4a5e	354	goto bail;
3e9b4a5e BS	355	spin_lock_irqsave(&ipath_devs_lock, flags);
	356	}
	357
	358	spin_unlock_irqrestore(&ipath_devs_lock, flags);
	359
	360	bail:
	361	return ret;
	362	}
	363
454e2398 DH	364	static int ipathfs_get_sb(struct file_system_type *fs_type, int flags,
454e2398 DH	365	const char dev_name, void data, struct vfsmount *mnt)
3e9b4a5e	366	{
454e2398 DH	367	int ret = get_sb_single(fs_type, flags, data,
	368	ipathfs_fill_super, mnt);
	369	if (ret >= 0)
	370	ipath_super = mnt->mnt_sb;
	371	return ret;
3e9b4a5e BS	372	}
	373
	374	static void ipathfs_kill_super(struct super_block *s)
	375	{
	376	kill_litter_super(s);
	377	ipath_super = NULL;
	378	}
	379
	380	int ipathfs_add_device(struct ipath_devdata *dd)
	381	{
	382	int ret;
	383
	384	if (ipath_super == NULL) {
	385	ret = 0;
	386	goto bail;
	387	}
	388
	389	ret = create_device_files(ipath_super, dd);
	390
	391	bail:
	392	return ret;
	393	}
	394
	395	int ipathfs_remove_device(struct ipath_devdata *dd)
	396	{
	397	int ret;
	398
	399	if (ipath_super == NULL) {
	400	ret = 0;
	401	goto bail;
	402	}
	403
	404	ret = remove_device_files(ipath_super, dd);
	405
	406	bail:
	407	return ret;
	408	}
	409
	410	static struct file_system_type ipathfs_fs_type = {
	411	.owner = THIS_MODULE,
	412	.name = "ipathfs",
	413	.get_sb = ipathfs_get_sb,
	414	.kill_sb = ipathfs_kill_super,
	415	};
	416
	417	int __init ipath_init_ipathfs(void)
	418	{
	419	return register_filesystem(&ipathfs_fs_type);
	420	}
	421
	422	void __exit ipath_exit_ipathfs(void)
	423	{
	424	unregister_filesystem(&ipathfs_fs_type);
	425	}