[net-next-2.6.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_ino = get_next_ino();
	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 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,
};

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
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;
3e9b4a5e BS	64	if ((mode & S_IFMT) == S_IFDIR) {
3e9b4a5e BS	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
	79	static int create_file(const char *name, mode_t mode,
	80	struct dentry parent, struct dentry *dentry,
2b8693c0	81	const struct file_operations fops, void data)
3e9b4a5e BS	82	{
	83	int error;
	84
	85	*dentry = NULL;
	86	mutex_lock(&parent->d_inode->i_mutex);
	87	*dentry = lookup_one_len(name, parent, strlen(name));
64f22fa1	88	if (!IS_ERR(*dentry))
3e9b4a5e BS	89	error = ipathfs_mknod(parent->d_inode, *dentry,
	90	mode, fops, data);
	91	else
	92	error = PTR_ERR(dentry);
	93	mutex_unlock(&parent->d_inode->i_mutex);
	94
	95	return error;
	96	}
	97
	98	static ssize_t atomic_stats_read(struct file file, char __user buf,
	99	size_t count, loff_t *ppos)
	100	{
	101	return simple_read_from_buffer(buf, count, ppos, &ipath_stats,
	102	sizeof ipath_stats);
	103	}
	104
2b8693c0	105	static const struct file_operations atomic_stats_ops = {
3e9b4a5e	106	.read = atomic_stats_read,
6038f373	107	.llseek = default_llseek,
3e9b4a5e BS	108	};
3e9b4a5e BS	109
3e9b4a5e BS	110	static ssize_t atomic_counters_read(struct file file, char __user buf,
	111	size_t count, loff_t *ppos)
	112	{
3029fcc3	113	struct infinipath_counters counters;
3e9b4a5e BS	114	struct ipath_devdata *dd;
3e9b4a5e BS	115
1cfd6e64	116	dd = file->f_path.dentry->d_inode->i_private;
3029fcc3	117	dd->ipath_f_read_counters(dd, &counters);
3e9b4a5e	118
3029fcc3	119	return simple_read_from_buffer(buf, count, ppos, &counters,
3e9b4a5e BS	120	sizeof counters);
	121	}
	122
2b8693c0	123	static const struct file_operations atomic_counters_ops = {
3e9b4a5e	124	.read = atomic_counters_read,
6038f373	125	.llseek = default_llseek,
3e9b4a5e BS	126	};
3e9b4a5e BS	127
3e9b4a5e BS	128	static ssize_t flash_read(struct file file, char __user buf,
	129	size_t count, loff_t *ppos)
	130	{
	131	struct ipath_devdata *dd;
	132	ssize_t ret;
	133	loff_t pos;
	134	char *tmp;
	135
	136	pos = *ppos;
	137
	138	if ( pos < 0) {
	139	ret = -EINVAL;
	140	goto bail;
	141	}
	142
	143	if (pos >= sizeof(struct ipath_flash)) {
	144	ret = 0;
	145	goto bail;
	146	}
	147
	148	if (count > sizeof(struct ipath_flash) - pos)
	149	count = sizeof(struct ipath_flash) - pos;
	150
	151	tmp = kmalloc(count, GFP_KERNEL);
	152	if (!tmp) {
	153	ret = -ENOMEM;
	154	goto bail;
	155	}
	156
1cfd6e64	157	dd = file->f_path.dentry->d_inode->i_private;
3e9b4a5e BS	158	if (ipath_eeprom_read(dd, pos, tmp, count)) {
	159	ipath_dev_err(dd, "failed to read from flash\n");
	160	ret = -ENXIO;
	161	goto bail_tmp;
	162	}
	163
	164	if (copy_to_user(buf, tmp, count)) {
	165	ret = -EFAULT;
	166	goto bail_tmp;
	167	}
	168
	169	*ppos = pos + count;
	170	ret = count;
	171
	172	bail_tmp:
	173	kfree(tmp);
	174
	175	bail:
	176	return ret;
	177	}
	178
	179	static ssize_t flash_write(struct file file, const char __user buf,
	180	size_t count, loff_t *ppos)
	181	{
	182	struct ipath_devdata *dd;
	183	ssize_t ret;
	184	loff_t pos;
	185	char *tmp;
	186
	187	pos = *ppos;
	188
7dae5bff	189	if (pos != 0) {
3e9b4a5e BS	190	ret = -EINVAL;
	191	goto bail;
	192	}
	193
7dae5bff BS	194	if (count != sizeof(struct ipath_flash)) {
7dae5bff BS	195	ret = -EINVAL;
3e9b4a5e BS	196	goto bail;
	197	}
	198
3e9b4a5e BS	199	tmp = kmalloc(count, GFP_KERNEL);
	200	if (!tmp) {
	201	ret = -ENOMEM;
	202	goto bail;
	203	}
	204
	205	if (copy_from_user(tmp, buf, count)) {
	206	ret = -EFAULT;
	207	goto bail_tmp;
	208	}
	209
1cfd6e64	210	dd = file->f_path.dentry->d_inode->i_private;
3e9b4a5e BS	211	if (ipath_eeprom_write(dd, pos, tmp, count)) {
	212	ret = -ENXIO;
	213	ipath_dev_err(dd, "failed to write to flash\n");
	214	goto bail_tmp;
	215	}
	216
	217	*ppos = pos + count;
	218	ret = count;
	219
	220	bail_tmp:
	221	kfree(tmp);
	222
	223	bail:
	224	return ret;
	225	}
	226
2b8693c0	227	static const struct file_operations flash_ops = {
3e9b4a5e BS	228	.read = flash_read,
3e9b4a5e BS	229	.write = flash_write,
6038f373	230	.llseek = default_llseek,
3e9b4a5e BS	231	};
	232
	233	static int create_device_files(struct super_block *sb,
	234	struct ipath_devdata *dd)
	235	{
	236	struct dentry dir, tmp;
	237	char unit[10];
	238	int ret;
	239
	240	snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
	241	ret = create_file(unit, S_IFDIR\|S_IRUGO\|S_IXUGO, sb->s_root, &dir,
f7fca1e8	242	&simple_dir_operations, dd);
3e9b4a5e BS	243	if (ret) {
	244	printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
	245	goto bail;
	246	}
	247
	248	ret = create_file("atomic_counters", S_IFREG\|S_IRUGO, dir, &tmp,
	249	&atomic_counters_ops, dd);
	250	if (ret) {
	251	printk(KERN_ERR "create_file(%s/atomic_counters) "
	252	"failed: %d\n", unit, ret);
	253	goto bail;
	254	}
	255
3e9b4a5e BS	256	ret = create_file("flash", S_IFREG\|S_IWUSR\|S_IRUGO, dir, &tmp,
	257	&flash_ops, dd);
	258	if (ret) {
	259	printk(KERN_ERR "create_file(%s/flash) "
	260	"failed: %d\n", unit, ret);
	261	goto bail;
	262	}
	263
	264	bail:
	265	return ret;
	266	}
	267
fae8773b	268	static int remove_file(struct dentry parent, char name)
3e9b4a5e BS	269	{
3e9b4a5e BS	270	struct dentry *tmp;
fae8773b	271	int ret;
3e9b4a5e BS	272
	273	tmp = lookup_one_len(name, parent, strlen(name));
	274
fae8773b BS	275	if (IS_ERR(tmp)) {
	276	ret = PTR_ERR(tmp);
	277	goto bail;
	278	}
	279
3e9b4a5e BS	280	spin_lock(&dcache_lock);
	281	spin_lock(&tmp->d_lock);
	282	if (!(d_unhashed(tmp) && tmp->d_inode)) {
	283	dget_locked(tmp);
	284	__d_drop(tmp);
	285	spin_unlock(&tmp->d_lock);
	286	spin_unlock(&dcache_lock);
	287	simple_unlink(parent->d_inode, tmp);
	288	} else {
	289	spin_unlock(&tmp->d_lock);
	290	spin_unlock(&dcache_lock);
	291	}
fae8773b BS	292
	293	ret = 0;
	294	bail:
	295	/*
	296	* We don't expect clients to care about the return value, but
	297	* it's there if they need it.
	298	*/
	299	return ret;
3e9b4a5e BS	300	}
	301
	302	static int remove_device_files(struct super_block *sb,
	303	struct ipath_devdata *dd)
	304	{
	305	struct dentry dir, root;
	306	char unit[10];
	307	int ret;
	308
	309	root = dget(sb->s_root);
	310	mutex_lock(&root->d_inode->i_mutex);
	311	snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
	312	dir = lookup_one_len(unit, root, strlen(unit));
	313
	314	if (IS_ERR(dir)) {
	315	ret = PTR_ERR(dir);
	316	printk(KERN_ERR "Lookup of %s failed\n", unit);
	317	goto bail;
	318	}
	319
	320	remove_file(dir, "flash");
3e9b4a5e BS	321	remove_file(dir, "atomic_counters");
	322	d_delete(dir);
	323	ret = simple_rmdir(root->d_inode, dir);
	324
	325	bail:
	326	mutex_unlock(&root->d_inode->i_mutex);
	327	dput(root);
	328	return ret;
	329	}
	330
	331	static int ipathfs_fill_super(struct super_block sb, void data,
	332	int silent)
	333	{
	334	struct ipath_devdata dd, tmp;
	335	unsigned long flags;
	336	int ret;
	337
	338	static struct tree_descr files[] = {
1a1c9bb4	339	[2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
3e9b4a5e BS	340	{""},
	341	};
	342
	343	ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
	344	if (ret) {
	345	printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
	346	goto bail;
	347	}
	348
	349	spin_lock_irqsave(&ipath_devs_lock, flags);
	350
	351	list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
	352	spin_unlock_irqrestore(&ipath_devs_lock, flags);
	353	ret = create_device_files(sb, dd);
12e9a456	354	if (ret)
3e9b4a5e	355	goto bail;
3e9b4a5e BS	356	spin_lock_irqsave(&ipath_devs_lock, flags);
	357	}
	358
	359	spin_unlock_irqrestore(&ipath_devs_lock, flags);
	360
	361	bail:
	362	return ret;
	363	}
	364
fc14f2fe AV	365	static struct dentry ipathfs_mount(struct file_system_type fs_type,
fc14f2fe AV	366	int flags, const char dev_name, void data)
3e9b4a5e	367	{
fc14f2fe AV	368	struct dentry *ret;
	369	ret = mount_single(fs_type, flags, data, ipathfs_fill_super);
	370	if (!IS_ERR(ret))
	371	ipath_super = ret->d_sb;
454e2398	372	return ret;
3e9b4a5e BS	373	}
	374
	375	static void ipathfs_kill_super(struct super_block *s)
	376	{
	377	kill_litter_super(s);
	378	ipath_super = NULL;
	379	}
	380
	381	int ipathfs_add_device(struct ipath_devdata *dd)
	382	{
	383	int ret;
	384
	385	if (ipath_super == NULL) {
	386	ret = 0;
	387	goto bail;
	388	}
	389
	390	ret = create_device_files(ipath_super, dd);
	391
	392	bail:
	393	return ret;
	394	}
	395
	396	int ipathfs_remove_device(struct ipath_devdata *dd)
	397	{
	398	int ret;
	399
	400	if (ipath_super == NULL) {
	401	ret = 0;
	402	goto bail;
	403	}
	404
	405	ret = remove_device_files(ipath_super, dd);
	406
	407	bail:
	408	return ret;
	409	}
	410
	411	static struct file_system_type ipathfs_fs_type = {
	412	.owner = THIS_MODULE,
	413	.name = "ipathfs",
fc14f2fe	414	.mount = ipathfs_mount,
3e9b4a5e BS	415	.kill_sb = ipathfs_kill_super,
	416	};
	417
	418	int __init ipath_init_ipathfs(void)
	419	{
	420	return register_filesystem(&ipathfs_fs_type);
	421	}
	422
	423	void __exit ipath_exit_ipathfs(void)
	424	{
	425	unregister_filesystem(&ipathfs_fs_type);
	426	}