1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
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>
40
41#include "ipath_kernel.h"
42
43#define IPATHFS_MAGIC 0x726a77
44
45static struct super_block *ipath_super;
46
47static int ipathfs_mknod(struct inode *dir, struct dentry *dentry,
48 int mode, const struct file_operations *fops,
49 void *data)
50{
51 int error;
52 struct inode *inode = new_inode(dir->i_sb);
53
54 if (!inode) {
55 error = -EPERM;
56 goto bail;
57 }
58
59 inode->i_mode = mode;
60 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
61 inode->i_private = data;
62 if ((mode & S_IFMT) == S_IFDIR) {
63 inode->i_op = &simple_dir_inode_operations;
64 inc_nlink(inode);
65 inc_nlink(dir);
66 }
67
68 inode->i_fop = fops;
69
70 d_instantiate(dentry, inode);
71 error = 0;
72
73bail:
74 return error;
75}
76
77static int create_file(const char *name, mode_t mode,
78 struct dentry *parent, struct dentry **dentry,
79 const struct file_operations *fops, void *data)
80{
81 int error;
82
83 *dentry = NULL;
84 mutex_lock(&parent->d_inode->i_mutex);
85 *dentry = lookup_one_len(name, parent, strlen(name));
86 if (!IS_ERR(*dentry))
87 error = ipathfs_mknod(parent->d_inode, *dentry,
88 mode, fops, data);
89 else
90 error = PTR_ERR(dentry);
91 mutex_unlock(&parent->d_inode->i_mutex);
92
93 return error;
94}
95
96static ssize_t atomic_stats_read(struct file *file, char __user *buf,
97 size_t count, loff_t *ppos)
98{
99 return simple_read_from_buffer(buf, count, ppos, &ipath_stats,
100 sizeof ipath_stats);
101}
102
103static const struct file_operations atomic_stats_ops = {
104 .read = atomic_stats_read,
105};
106
107static ssize_t atomic_counters_read(struct file *file, char __user *buf,
108 size_t count, loff_t *ppos)
109{
110 struct infinipath_counters counters;
111 struct ipath_devdata *dd;
112
113 dd = file->f_path.dentry->d_inode->i_private;
114 dd->ipath_f_read_counters(dd, &counters);
115
116 return simple_read_from_buffer(buf, count, ppos, &counters,
117 sizeof counters);
118}
119
120static const struct file_operations atomic_counters_ops = {
121 .read = atomic_counters_read,
122};
123
124static ssize_t flash_read(struct file *file, char __user *buf,
125 size_t count, loff_t *ppos)
126{
127 struct ipath_devdata *dd;
128 ssize_t ret;
129 loff_t pos;
130 char *tmp;
131
132 pos = *ppos;
133
134 if ( pos < 0) {
135 ret = -EINVAL;
136 goto bail;
137 }
138
139 if (pos >= sizeof(struct ipath_flash)) {
140 ret = 0;
141 goto bail;
142 }
143
144 if (count > sizeof(struct ipath_flash) - pos)
145 count = sizeof(struct ipath_flash) - pos;
146
147 tmp = kmalloc(count, GFP_KERNEL);
148 if (!tmp) {
149 ret = -ENOMEM;
150 goto bail;
151 }
152
153 dd = file->f_path.dentry->d_inode->i_private;
154 if (ipath_eeprom_read(dd, pos, tmp, count)) {
155 ipath_dev_err(dd, "failed to read from flash\n");
156 ret = -ENXIO;
157 goto bail_tmp;
158 }
159
160 if (copy_to_user(buf, tmp, count)) {
161 ret = -EFAULT;
162 goto bail_tmp;
163 }
164
165 *ppos = pos + count;
166 ret = count;
167
168bail_tmp:
169 kfree(tmp);
170
171bail:
172 return ret;
173}
174
175static ssize_t flash_write(struct file *file, const char __user *buf,
176 size_t count, loff_t *ppos)
177{
178 struct ipath_devdata *dd;
179 ssize_t ret;
180 loff_t pos;
181 char *tmp;
182
183 pos = *ppos;
184
185 if (pos != 0) {
186 ret = -EINVAL;
187 goto bail;
188 }
189
190 if (count != sizeof(struct ipath_flash)) {
191 ret = -EINVAL;
192 goto bail;
193 }
194
195 tmp = kmalloc(count, GFP_KERNEL);
196 if (!tmp) {
197 ret = -ENOMEM;
198 goto bail;
199 }
200
201 if (copy_from_user(tmp, buf, count)) {
202 ret = -EFAULT;
203 goto bail_tmp;
204 }
205
206 dd = file->f_path.dentry->d_inode->i_private;
207 if (ipath_eeprom_write(dd, pos, tmp, count)) {
208 ret = -ENXIO;
209 ipath_dev_err(dd, "failed to write to flash\n");
210 goto bail_tmp;
211 }
212
213 *ppos = pos + count;
214 ret = count;
215
216bail_tmp:
217 kfree(tmp);
218
219bail:
220 return ret;
221}
222
223static const struct file_operations flash_ops = {
224 .read = flash_read,
225 .write = flash_write,
226};
227
228static int create_device_files(struct super_block *sb,
229 struct ipath_devdata *dd)
230{
231 struct dentry *dir, *tmp;
232 char unit[10];
233 int ret;
234
235 snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
236 ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
237 &simple_dir_operations, dd);
238 if (ret) {
239 printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
240 goto bail;
241 }
242
243 ret = create_file("atomic_counters", S_IFREG|S_IRUGO, dir, &tmp,
244 &atomic_counters_ops, dd);
245 if (ret) {
246 printk(KERN_ERR "create_file(%s/atomic_counters) "
247 "failed: %d\n", unit, ret);
248 goto bail;
249 }
250
251 ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
252 &flash_ops, dd);
253 if (ret) {
254 printk(KERN_ERR "create_file(%s/flash) "
255 "failed: %d\n", unit, ret);
256 goto bail;
257 }
258
259bail:
260 return ret;
261}
262
263static int remove_file(struct dentry *parent, char *name)
264{
265 struct dentry *tmp;
266 int ret;
267
268 tmp = lookup_one_len(name, parent, strlen(name));
269
270 if (IS_ERR(tmp)) {
271 ret = PTR_ERR(tmp);
272 goto bail;
273 }
274
275 spin_lock(&dcache_lock);
276 spin_lock(&tmp->d_lock);
277 if (!(d_unhashed(tmp) && tmp->d_inode)) {
278 dget_locked(tmp);
279 __d_drop(tmp);
280 spin_unlock(&tmp->d_lock);
281 spin_unlock(&dcache_lock);
282 simple_unlink(parent->d_inode, tmp);
283 } else {
284 spin_unlock(&tmp->d_lock);
285 spin_unlock(&dcache_lock);
286 }
287
288 ret = 0;
289bail:
290
291
292
293
294 return ret;
295}
296
297static int remove_device_files(struct super_block *sb,
298 struct ipath_devdata *dd)
299{
300 struct dentry *dir, *root;
301 char unit[10];
302 int ret;
303
304 root = dget(sb->s_root);
305 mutex_lock(&root->d_inode->i_mutex);
306 snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
307 dir = lookup_one_len(unit, root, strlen(unit));
308
309 if (IS_ERR(dir)) {
310 ret = PTR_ERR(dir);
311 printk(KERN_ERR "Lookup of %s failed\n", unit);
312 goto bail;
313 }
314
315 remove_file(dir, "flash");
316 remove_file(dir, "atomic_counters");
317 d_delete(dir);
318 ret = simple_rmdir(root->d_inode, dir);
319
320bail:
321 mutex_unlock(&root->d_inode->i_mutex);
322 dput(root);
323 return ret;
324}
325
326static int ipathfs_fill_super(struct super_block *sb, void *data,
327 int silent)
328{
329 struct ipath_devdata *dd, *tmp;
330 unsigned long flags;
331 int ret;
332
333 static struct tree_descr files[] = {
334 [2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
335 {""},
336 };
337
338 ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
339 if (ret) {
340 printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
341 goto bail;
342 }
343
344 spin_lock_irqsave(&ipath_devs_lock, flags);
345
346 list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
347 spin_unlock_irqrestore(&ipath_devs_lock, flags);
348 ret = create_device_files(sb, dd);
349 if (ret) {
350 deactivate_locked_super(sb);
351 goto bail;
352 }
353 spin_lock_irqsave(&ipath_devs_lock, flags);
354 }
355
356 spin_unlock_irqrestore(&ipath_devs_lock, flags);
357
358bail:
359 return ret;
360}
361
362static int ipathfs_get_sb(struct file_system_type *fs_type, int flags,
363 const char *dev_name, void *data, struct vfsmount *mnt)
364{
365 int ret = get_sb_single(fs_type, flags, data,
366 ipathfs_fill_super, mnt);
367 if (ret >= 0)
368 ipath_super = mnt->mnt_sb;
369 return ret;
370}
371
372static void ipathfs_kill_super(struct super_block *s)
373{
374 kill_litter_super(s);
375 ipath_super = NULL;
376}
377
378int ipathfs_add_device(struct ipath_devdata *dd)
379{
380 int ret;
381
382 if (ipath_super == NULL) {
383 ret = 0;
384 goto bail;
385 }
386
387 ret = create_device_files(ipath_super, dd);
388
389bail:
390 return ret;
391}
392
393int ipathfs_remove_device(struct ipath_devdata *dd)
394{
395 int ret;
396
397 if (ipath_super == NULL) {
398 ret = 0;
399 goto bail;
400 }
401
402 ret = remove_device_files(ipath_super, dd);
403
404bail:
405 return ret;
406}
407
408static struct file_system_type ipathfs_fs_type = {
409 .owner = THIS_MODULE,
410 .name = "ipathfs",
411 .get_sb = ipathfs_get_sb,
412 .kill_sb = ipathfs_kill_super,
413};
414
415int __init ipath_init_ipathfs(void)
416{
417 return register_filesystem(&ipathfs_fs_type);
418}
419
420void __exit ipath_exit_ipathfs(void)
421{
422 unregister_filesystem(&ipathfs_fs_type);
423}
424
