422 lines
8.9 KiB
C
422 lines
8.9 KiB
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 "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,
|
||
|
|
};
|
||
|
|
|
||
|
|
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,
|
||
|
|
};
|
||
|
|
|
||
|
|
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,
|
||
|
|
};
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|