original development tree for Linux kernel GTP module; now long in mainline.
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/*
* 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;
*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_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 = kmalloc(count, GFP_KERNEL);
if (!tmp) {
ret = -ENOMEM;
goto bail;
}
if (copy_from_user(tmp, buf, count)) {
ret = -EFAULT;
goto bail_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 (!(d_unhashed(tmp) && tmp->d_inode)) {
dget_dlock(tmp);
__d_drop(tmp);
spin_unlock(&tmp->d_lock);
simple_unlink(parent->d_inode, 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);
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,
};
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);
}