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34#include <linux/version.h>
35#include <linux/module.h>
36#include <linux/fs.h>
37#include <linux/mount.h>
38#include <linux/pagemap.h>
39#include <linux/init.h>
40#include <linux/namei.h>
41
42#include "ipath_kernel.h"
43
44#define IPATHFS_MAGIC 0x726a77
45
46static struct super_block *ipath_super;
47
48static int ipathfs_mknod(struct inode *dir, struct dentry *dentry,
49 int mode, const struct file_operations *fops,
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
60 inode->i_mode = mode;
61 inode->i_uid = 0;
62 inode->i_gid = 0;
63 inode->i_blocks = 0;
64 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
65 inode->i_private = data;
66 if ((mode & S_IFMT) == S_IFDIR) {
67 inode->i_op = &simple_dir_inode_operations;
68 inc_nlink(inode);
69 inc_nlink(dir);
70 }
71
72 inode->i_fop = fops;
73
74 d_instantiate(dentry, inode);
75 error = 0;
76
77bail:
78 return error;
79}
80
81static int create_file(const char *name, mode_t mode,
82 struct dentry *parent, struct dentry **dentry,
83 const struct file_operations *fops, void *data)
84{
85 int error;
86
87 *dentry = NULL;
88 mutex_lock(&parent->d_inode->i_mutex);
89 *dentry = lookup_one_len(name, parent, strlen(name));
90 if (!IS_ERR(dentry))
91 error = ipathfs_mknod(parent->d_inode, *dentry,
92 mode, fops, data);
93 else
94 error = PTR_ERR(dentry);
95 mutex_unlock(&parent->d_inode->i_mutex);
96
97 return error;
98}
99
100static ssize_t atomic_stats_read(struct file *file, char __user *buf,
101 size_t count, loff_t *ppos)
102{
103 return simple_read_from_buffer(buf, count, ppos, &ipath_stats,
104 sizeof ipath_stats);
105}
106
107static const struct file_operations atomic_stats_ops = {
108 .read = atomic_stats_read,
109};
110
111static ssize_t atomic_counters_read(struct file *file, char __user *buf,
112 size_t count, loff_t *ppos)
113{
114 struct infinipath_counters counters;
115 struct ipath_devdata *dd;
116
117 dd = file->f_path.dentry->d_inode->i_private;
118 dd->ipath_f_read_counters(dd, &counters);
119
120 return simple_read_from_buffer(buf, count, ppos, &counters,
121 sizeof counters);
122}
123
124static const struct file_operations atomic_counters_ops = {
125 .read = atomic_counters_read,
126};
127
128static 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
157 dd = file->f_path.dentry->d_inode->i_private;
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
172bail_tmp:
173 kfree(tmp);
174
175bail:
176 return ret;
177}
178
179static 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
189 if (pos != 0) {
190 ret = -EINVAL;
191 goto bail;
192 }
193
194 if (count != sizeof(struct ipath_flash)) {
195 ret = -EINVAL;
196 goto bail;
197 }
198
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
210 dd = file->f_path.dentry->d_inode->i_private;
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
220bail_tmp:
221 kfree(tmp);
222
223bail:
224 return ret;
225}
226
227static const struct file_operations flash_ops = {
228 .read = flash_read,
229 .write = flash_write,
230};
231
232static int create_device_files(struct super_block *sb,
233 struct ipath_devdata *dd)
234{
235 struct dentry *dir, *tmp;
236 char unit[10];
237 int ret;
238
239 snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
240 ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
241 &simple_dir_operations, dd);
242 if (ret) {
243 printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
244 goto bail;
245 }
246
247 ret = create_file("atomic_counters", S_IFREG|S_IRUGO, dir, &tmp,
248 &atomic_counters_ops, dd);
249 if (ret) {
250 printk(KERN_ERR "create_file(%s/atomic_counters) "
251 "failed: %d\n", unit, ret);
252 goto bail;
253 }
254
255 ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
256 &flash_ops, dd);
257 if (ret) {
258 printk(KERN_ERR "create_file(%s/flash) "
259 "failed: %d\n", unit, ret);
260 goto bail;
261 }
262
263bail:
264 return ret;
265}
266
267static int remove_file(struct dentry *parent, char *name)
268{
269 struct dentry *tmp;
270 int ret;
271
272 tmp = lookup_one_len(name, parent, strlen(name));
273
274 if (IS_ERR(tmp)) {
275 ret = PTR_ERR(tmp);
276 goto bail;
277 }
278
279 spin_lock(&dcache_lock);
280 spin_lock(&tmp->d_lock);
281 if (!(d_unhashed(tmp) && tmp->d_inode)) {
282 dget_locked(tmp);
283 __d_drop(tmp);
284 spin_unlock(&tmp->d_lock);
285 spin_unlock(&dcache_lock);
286 simple_unlink(parent->d_inode, tmp);
287 } else {
288 spin_unlock(&tmp->d_lock);
289 spin_unlock(&dcache_lock);
290 }
291
292 ret = 0;
293bail:
294
295
296
297
298 return ret;
299}
300
301static int remove_device_files(struct super_block *sb,
302 struct ipath_devdata *dd)
303{
304 struct dentry *dir, *root;
305 char unit[10];
306 int ret;
307
308 root = dget(sb->s_root);
309 mutex_lock(&root->d_inode->i_mutex);
310 snprintf(unit, sizeof unit, "%02d", dd->ipath_unit);
311 dir = lookup_one_len(unit, root, strlen(unit));
312
313 if (IS_ERR(dir)) {
314 ret = PTR_ERR(dir);
315 printk(KERN_ERR "Lookup of %s failed\n", unit);
316 goto bail;
317 }
318
319 remove_file(dir, "flash");
320 remove_file(dir, "atomic_counters");
321 d_delete(dir);
322 ret = simple_rmdir(root->d_inode, dir);
323
324bail:
325 mutex_unlock(&root->d_inode->i_mutex);
326 dput(root);
327 return ret;
328}
329
330static int ipathfs_fill_super(struct super_block *sb, void *data,
331 int silent)
332{
333 struct ipath_devdata *dd, *tmp;
334 unsigned long flags;
335 int ret;
336
337 static struct tree_descr files[] = {
338 [2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO},
339 {""},
340 };
341
342 ret = simple_fill_super(sb, IPATHFS_MAGIC, files);
343 if (ret) {
344 printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
345 goto bail;
346 }
347
348 spin_lock_irqsave(&ipath_devs_lock, flags);
349
350 list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) {
351 spin_unlock_irqrestore(&ipath_devs_lock, flags);
352 ret = create_device_files(sb, dd);
353 if (ret) {
354 deactivate_super(sb);
355 goto bail;
356 }
357 spin_lock_irqsave(&ipath_devs_lock, flags);
358 }
359
360 spin_unlock_irqrestore(&ipath_devs_lock, flags);
361
362bail:
363 return ret;
364}
365
366static int ipathfs_get_sb(struct file_system_type *fs_type, int flags,
367 const char *dev_name, void *data, struct vfsmount *mnt)
368{
369 int ret = get_sb_single(fs_type, flags, data,
370 ipathfs_fill_super, mnt);
371 if (ret >= 0)
372 ipath_super = mnt->mnt_sb;
373 return ret;
374}
375
376static void ipathfs_kill_super(struct super_block *s)
377{
378 kill_litter_super(s);
379 ipath_super = NULL;
380}
381
382int ipathfs_add_device(struct ipath_devdata *dd)
383{
384 int ret;
385
386 if (ipath_super == NULL) {
387 ret = 0;
388 goto bail;
389 }
390
391 ret = create_device_files(ipath_super, dd);
392
393bail:
394 return ret;
395}
396
397int ipathfs_remove_device(struct ipath_devdata *dd)
398{
399 int ret;
400
401 if (ipath_super == NULL) {
402 ret = 0;
403 goto bail;
404 }
405
406 ret = remove_device_files(ipath_super, dd);
407
408bail:
409 return ret;
410}
411
412static struct file_system_type ipathfs_fs_type = {
413 .owner = THIS_MODULE,
414 .name = "ipathfs",
415 .get_sb = ipathfs_get_sb,
416 .kill_sb = ipathfs_kill_super,
417};
418
419int __init ipath_init_ipathfs(void)
420{
421 return register_filesystem(&ipathfs_fs_type);
422}
423
424void __exit ipath_exit_ipathfs(void)
425{
426 unregister_filesystem(&ipathfs_fs_type);
427}
428
