2 * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2006 PathScale, Inc. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
34 #include <linux/module.h>
36 #include <linux/mount.h>
37 #include <linux/pagemap.h>
38 #include <linux/init.h>
39 #include <linux/namei.h>
40 #include <linux/slab.h>
42 #include "ipath_kernel.h"
44 #define IPATHFS_MAGIC 0x726a77
46 static struct super_block *ipath_super;
48 static int ipathfs_mknod(struct inode *dir, struct dentry *dentry,
49 int mode, const struct file_operations *fops,
53 struct inode *inode = new_inode(dir->i_sb);
61 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
62 inode->i_private = data;
63 if ((mode & S_IFMT) == S_IFDIR) {
64 inode->i_op = &simple_dir_inode_operations;
71 d_instantiate(dentry, inode);
78 static int create_file(const char *name, mode_t mode,
79 struct dentry *parent, struct dentry **dentry,
80 const struct file_operations *fops, void *data)
85 mutex_lock(&parent->d_inode->i_mutex);
86 *dentry = lookup_one_len(name, parent, strlen(name));
88 error = ipathfs_mknod(parent->d_inode, *dentry,
91 error = PTR_ERR(dentry);
92 mutex_unlock(&parent->d_inode->i_mutex);
97 static ssize_t atomic_stats_read(struct file *file, char __user *buf,
98 size_t count, loff_t *ppos)
100 return simple_read_from_buffer(buf, count, ppos, &ipath_stats,
104 static const struct file_operations atomic_stats_ops = {
105 .read = atomic_stats_read,
108 static ssize_t atomic_counters_read(struct file *file, char __user *buf,
109 size_t count, loff_t *ppos)
111 struct infinipath_counters counters;
112 struct ipath_devdata *dd;
114 dd = file->f_path.dentry->d_inode->i_private;
115 dd->ipath_f_read_counters(dd, &counters);
117 return simple_read_from_buffer(buf, count, ppos, &counters,
121 static const struct file_operations atomic_counters_ops = {
122 .read = atomic_counters_read,
125 static ssize_t flash_read(struct file *file, char __user *buf,
126 size_t count, loff_t *ppos)
128 struct ipath_devdata *dd;
140 if (pos >= sizeof(struct ipath_flash)) {
145 if (count > sizeof(struct ipath_flash) - pos)
146 count = sizeof(struct ipath_flash) - pos;
148 tmp = kmalloc(count, GFP_KERNEL);
154 dd = file->f_path.dentry->d_inode->i_private;
155 if (ipath_eeprom_read(dd, pos, tmp, count)) {
156 ipath_dev_err(dd, "failed to read from flash\n");
161 if (copy_to_user(buf, tmp, count)) {
176 static ssize_t flash_write(struct file *file, const char __user *buf,
177 size_t count, loff_t *ppos)
179 struct ipath_devdata *dd;
191 if (count != sizeof(struct ipath_flash)) {
196 tmp = kmalloc(count, GFP_KERNEL);
202 if (copy_from_user(tmp, buf, count)) {
207 dd = file->f_path.dentry->d_inode->i_private;
208 if (ipath_eeprom_write(dd, pos, tmp, count)) {
210 ipath_dev_err(dd, "failed to write to flash\n");
224 static const struct file_operations flash_ops = {
226 .write = flash_write,
229 static int create_device_files(struct super_block *sb,
230 struct ipath_devdata *dd)
232 struct dentry *dir, *tmp;
236 snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
237 ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
238 &simple_dir_operations, dd);
240 printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
244 ret = create_file("atomic_counters", S_IFREG|S_IRUGO, dir, &tmp,
245 &atomic_counters_ops, dd);
247 printk(KERN_ERR "create_file(%s/atomic_counters) "
248 "failed: %d\n", unit, ret);
252 ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
255 printk(KERN_ERR "create_file(%s/flash) "
256 "failed: %d\n", unit, ret);
264 static int remove_file(struct dentry *parent, char *name)
269 tmp = lookup_one_len(name, parent, strlen(name));
276 spin_lock(&dcache_lock);
277 spin_lock(&tmp->d_lock);
278 if (!(d_unhashed(tmp) && tmp->d_inode)) {
281 spin_unlock(&tmp->d_lock);
282 spin_unlock(&dcache_lock);
283 simple_unlink(parent->d_inode, tmp);
285 spin_unlock(&tmp->d_lock);
286 spin_unlock(&dcache_lock);
292 * We don't expect clients to care about the return value, but
293 * it's there if they need it.
298 static int remove_device_files(struct super_block *sb,
299 struct ipath_devdata *dd)
301 struct dentry *dir, *root;
305 root = dget(sb->s_root);
306 mutex_lock(&root->d_inode->i_mutex);
307 snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
308 dir = lookup_one_len(unit, root, strlen(unit));
312 printk(KERN_ERR "Lookup of %s failed\n", unit);
316 remove_file(dir, "flash");
317 remove_file(dir, "atomic_counters");
319 ret = simple_rmdir(root->d_inode, dir);
322 mutex_unlock(&root->d_inode->i_mutex);
327 static int ipathfs_fill_super(struct super_block *sb, void *data,
330 struct ipath_devdata *dd, *tmp;
334 static struct tree_descr files[] = {
335 [2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
339 ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
341 printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
345 spin_lock_irqsave(&ipath_devs_lock, flags);
347 list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
348 spin_unlock_irqrestore(&ipath_devs_lock, flags);
349 ret = create_device_files(sb, dd);
352 spin_lock_irqsave(&ipath_devs_lock, flags);
355 spin_unlock_irqrestore(&ipath_devs_lock, flags);
361 static int ipathfs_get_sb(struct file_system_type *fs_type, int flags,
362 const char *dev_name, void *data, struct vfsmount *mnt)
364 int ret = get_sb_single(fs_type, flags, data,
365 ipathfs_fill_super, mnt);
367 ipath_super = mnt->mnt_sb;
371 static void ipathfs_kill_super(struct super_block *s)
373 kill_litter_super(s);
377 int ipathfs_add_device(struct ipath_devdata *dd)
381 if (ipath_super == NULL) {
386 ret = create_device_files(ipath_super, dd);
392 int ipathfs_remove_device(struct ipath_devdata *dd)
396 if (ipath_super == NULL) {
401 ret = remove_device_files(ipath_super, dd);
407 static struct file_system_type ipathfs_fs_type = {
408 .owner = THIS_MODULE,
410 .get_sb = ipathfs_get_sb,
411 .kill_sb = ipathfs_kill_super,
414 int __init ipath_init_ipathfs(void)
416 return register_filesystem(&ipathfs_fs_type);
419 void __exit ipath_exit_ipathfs(void)
421 unregister_filesystem(&ipathfs_fs_type);