[mirror_ubuntu-zesty-kernel.git] / drivers / staging / rdma / 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,
			 umode_t 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_ino = get_next_ino();
	inode->i_mode = mode;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	inode->i_private = data;
	if (S_ISDIR(mode)) {
		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, umode_t mode,
		       struct dentry *parent, struct dentry **dentry,
		       const struct file_operations *fops, void *data)
{
	int error;

	inode_lock(d_inode(parent));
	*dentry = lookup_one_len(name, parent, strlen(name));
	if (!IS_ERR(*dentry))
		error = ipathfs_mknod(d_inode(parent), *dentry,
				      mode, fops, data);
	else
		error = PTR_ERR(*dentry);
	inode_unlock(d_inode(parent));

	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_inode(file)->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_inode(file)->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 = memdup_user(buf, count);
	if (IS_ERR(tmp))
		return PTR_ERR(tmp);

	dd = file_inode(file)->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(&tmp->d_lock);
	if (simple_positive(tmp)) {
		dget_dlock(tmp);
		__d_drop(tmp);
		spin_unlock(&tmp->d_lock);
		simple_unlink(d_inode(parent), tmp);
	} else
		spin_unlock(&tmp->d_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);
	inode_lock(d_inode(root));
	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(d_inode(root), dir);

bail:
	inode_unlock(d_inode(root));
	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 struct dentry *ipathfs_mount(struct file_system_type *fs_type,
			int flags, const char *dev_name, void *data)
{
	struct dentry *ret;
	ret = mount_single(fs_type, flags, data, ipathfs_fill_super);
	if (!IS_ERR(ret))
		ipath_super = ret->d_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",
	.mount =	ipathfs_mount,
	.kill_sb =	ipathfs_kill_super,
};
MODULE_ALIAS_FS("ipathfs");

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,
f9ec8006	49	umode_t 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
85fe4025	60	inode->i_ino = get_next_ino();
3e9b4a5e	61	inode->i_mode = mode;
3e9b4a5e	62	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
8e18e294	63	inode->i_private = data;
f9ec8006	64	if (S_ISDIR(mode)) {
3e9b4a5e	65	inode->i_op = &simple_dir_inode_operations;
d8c76e6f DH	66	inc_nlink(inode);
d8c76e6f DH	67	inc_nlink(dir);
3e9b4a5e BS	68	}
	69
	70	inode->i_fop = fops;
	71
	72	d_instantiate(dentry, inode);
	73	error = 0;
	74
	75	bail:
	76	return error;
	77	}
	78
f9ec8006	79	static int create_file(const char *name, umode_t mode,
3e9b4a5e	80	struct dentry parent, struct dentry *dentry,
2b8693c0	81	const struct file_operations fops, void data)
3e9b4a5e BS	82	{
	83	int error;
	84
5955102c	85	inode_lock(d_inode(parent));
3e9b4a5e	86	*dentry = lookup_one_len(name, parent, strlen(name));
64f22fa1	87	if (!IS_ERR(*dentry))
75c3cfa8	88	error = ipathfs_mknod(d_inode(parent), *dentry,
3e9b4a5e BS	89	mode, fops, data);
3e9b4a5e BS	90	else
ef535287	91	error = PTR_ERR(*dentry);
5955102c	92	inode_unlock(d_inode(parent));
3e9b4a5e BS	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
496ad9aa	115	dd = file_inode(file)->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
496ad9aa	156	dd = file_inode(file)->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
4ecc4a18 KS	198	tmp = memdup_user(buf, count);
	199	if (IS_ERR(tmp))
	200	return PTR_ERR(tmp);
3e9b4a5e	201
496ad9aa	202	dd = file_inode(file)->i_private;
3e9b4a5e BS	203	if (ipath_eeprom_write(dd, pos, tmp, count)) {
	204	ret = -ENXIO;
	205	ipath_dev_err(dd, "failed to write to flash\n");
	206	goto bail_tmp;
	207	}
	208
	209	*ppos = pos + count;
	210	ret = count;
	211
	212	bail_tmp:
	213	kfree(tmp);
	214
	215	bail:
	216	return ret;
	217	}
	218
2b8693c0	219	static const struct file_operations flash_ops = {
3e9b4a5e BS	220	.read = flash_read,
3e9b4a5e BS	221	.write = flash_write,
6038f373	222	.llseek = default_llseek,
3e9b4a5e BS	223	};
	224
	225	static int create_device_files(struct super_block *sb,
	226	struct ipath_devdata *dd)
	227	{
	228	struct dentry dir, tmp;
	229	char unit[10];
	230	int ret;
	231
	232	snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
	233	ret = create_file(unit, S_IFDIR\|S_IRUGO\|S_IXUGO, sb->s_root, &dir,
f7fca1e8	234	&simple_dir_operations, dd);
3e9b4a5e BS	235	if (ret) {
	236	printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
	237	goto bail;
	238	}
	239
	240	ret = create_file("atomic_counters", S_IFREG\|S_IRUGO, dir, &tmp,
	241	&atomic_counters_ops, dd);
	242	if (ret) {
	243	printk(KERN_ERR "create_file(%s/atomic_counters) "
	244	"failed: %d\n", unit, ret);
	245	goto bail;
	246	}
	247
3e9b4a5e BS	248	ret = create_file("flash", S_IFREG\|S_IWUSR\|S_IRUGO, dir, &tmp,
	249	&flash_ops, dd);
	250	if (ret) {
	251	printk(KERN_ERR "create_file(%s/flash) "
	252	"failed: %d\n", unit, ret);
	253	goto bail;
	254	}
	255
	256	bail:
	257	return ret;
	258	}
	259
fae8773b	260	static int remove_file(struct dentry parent, char name)
3e9b4a5e BS	261	{
3e9b4a5e BS	262	struct dentry *tmp;
fae8773b	263	int ret;
3e9b4a5e BS	264
	265	tmp = lookup_one_len(name, parent, strlen(name));
	266
fae8773b BS	267	if (IS_ERR(tmp)) {
	268	ret = PTR_ERR(tmp);
	269	goto bail;
	270	}
	271
3e9b4a5e	272	spin_lock(&tmp->d_lock);
dc3f4198	273	if (simple_positive(tmp)) {
dc0474be	274	dget_dlock(tmp);
3e9b4a5e BS	275	__d_drop(tmp);
3e9b4a5e BS	276	spin_unlock(&tmp->d_lock);
75c3cfa8	277	simple_unlink(d_inode(parent), tmp);
b5c84bf6	278	} else
3e9b4a5e	279	spin_unlock(&tmp->d_lock);
fae8773b BS	280
	281	ret = 0;
	282	bail:
	283	/*
	284	* We don't expect clients to care about the return value, but
	285	* it's there if they need it.
	286	*/
	287	return ret;
3e9b4a5e BS	288	}
	289
	290	static int remove_device_files(struct super_block *sb,
	291	struct ipath_devdata *dd)
	292	{
	293	struct dentry dir, root;
	294	char unit[10];
	295	int ret;
	296
	297	root = dget(sb->s_root);
5955102c	298	inode_lock(d_inode(root));
3e9b4a5e BS	299	snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
	300	dir = lookup_one_len(unit, root, strlen(unit));
	301
	302	if (IS_ERR(dir)) {
	303	ret = PTR_ERR(dir);
	304	printk(KERN_ERR "Lookup of %s failed\n", unit);
	305	goto bail;
	306	}
	307
	308	remove_file(dir, "flash");
3e9b4a5e BS	309	remove_file(dir, "atomic_counters");
3e9b4a5e BS	310	d_delete(dir);
75c3cfa8	311	ret = simple_rmdir(d_inode(root), dir);
3e9b4a5e BS	312
3e9b4a5e BS	313	bail:
5955102c	314	inode_unlock(d_inode(root));
3e9b4a5e BS	315	dput(root);
	316	return ret;
	317	}
	318
	319	static int ipathfs_fill_super(struct super_block sb, void data,
	320	int silent)
	321	{
	322	struct ipath_devdata dd, tmp;
	323	unsigned long flags;
	324	int ret;
	325
	326	static struct tree_descr files[] = {
1a1c9bb4	327	[2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
3e9b4a5e BS	328	{""},
	329	};
	330
	331	ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
	332	if (ret) {
	333	printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
	334	goto bail;
	335	}
	336
	337	spin_lock_irqsave(&ipath_devs_lock, flags);
	338
	339	list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
	340	spin_unlock_irqrestore(&ipath_devs_lock, flags);
	341	ret = create_device_files(sb, dd);
12e9a456	342	if (ret)
3e9b4a5e	343	goto bail;
3e9b4a5e BS	344	spin_lock_irqsave(&ipath_devs_lock, flags);
	345	}
	346
	347	spin_unlock_irqrestore(&ipath_devs_lock, flags);
	348
	349	bail:
	350	return ret;
	351	}
	352
fc14f2fe AV	353	static struct dentry ipathfs_mount(struct file_system_type fs_type,
fc14f2fe AV	354	int flags, const char dev_name, void data)
3e9b4a5e	355	{
fc14f2fe AV	356	struct dentry *ret;
	357	ret = mount_single(fs_type, flags, data, ipathfs_fill_super);
	358	if (!IS_ERR(ret))
	359	ipath_super = ret->d_sb;
454e2398	360	return ret;
3e9b4a5e BS	361	}
	362
	363	static void ipathfs_kill_super(struct super_block *s)
	364	{
	365	kill_litter_super(s);
	366	ipath_super = NULL;
	367	}
	368
	369	int ipathfs_add_device(struct ipath_devdata *dd)
	370	{
	371	int ret;
	372
	373	if (ipath_super == NULL) {
	374	ret = 0;
	375	goto bail;
	376	}
	377
	378	ret = create_device_files(ipath_super, dd);
	379
	380	bail:
	381	return ret;
	382	}
	383
	384	int ipathfs_remove_device(struct ipath_devdata *dd)
	385	{
	386	int ret;
	387
	388	if (ipath_super == NULL) {
	389	ret = 0;
	390	goto bail;
	391	}
	392
	393	ret = remove_device_files(ipath_super, dd);
	394
	395	bail:
	396	return ret;
	397	}
	398
	399	static struct file_system_type ipathfs_fs_type = {
	400	.owner = THIS_MODULE,
	401	.name = "ipathfs",
fc14f2fe	402	.mount = ipathfs_mount,
3e9b4a5e BS	403	.kill_sb = ipathfs_kill_super,
3e9b4a5e BS	404	};
7f78e035	405	MODULE_ALIAS_FS("ipathfs");
3e9b4a5e BS	406
	407	int __init ipath_init_ipathfs(void)
	408	{
	409	return register_filesystem(&ipathfs_fs_type);
	410	}
	411
	412	void __exit ipath_exit_ipathfs(void)
	413	{
	414	unregister_filesystem(&ipathfs_fs_type);
	415	}