block_device_operations->release() should return void
[linux-3.10.git] / drivers / ide / ide-gd.c
1 #include <linux/module.h>
2 #include <linux/types.h>
3 #include <linux/string.h>
4 #include <linux/kernel.h>
5 #include <linux/errno.h>
6 #include <linux/genhd.h>
7 #include <linux/mutex.h>
8 #include <linux/ide.h>
9 #include <linux/hdreg.h>
10 #include <linux/dmi.h>
11 #include <linux/slab.h>
12
13 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
14 #define IDE_DISK_MINORS         (1 << PARTN_BITS)
15 #else
16 #define IDE_DISK_MINORS         0
17 #endif
18
19 #include "ide-disk.h"
20 #include "ide-floppy.h"
21
22 #define IDE_GD_VERSION  "1.18"
23
24 /* module parameters */
25 static DEFINE_MUTEX(ide_gd_mutex);
26 static unsigned long debug_mask;
27 module_param(debug_mask, ulong, 0644);
28
29 static DEFINE_MUTEX(ide_disk_ref_mutex);
30
31 static void ide_disk_release(struct device *);
32
33 static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
34 {
35         struct ide_disk_obj *idkp = NULL;
36
37         mutex_lock(&ide_disk_ref_mutex);
38         idkp = ide_drv_g(disk, ide_disk_obj);
39         if (idkp) {
40                 if (ide_device_get(idkp->drive))
41                         idkp = NULL;
42                 else
43                         get_device(&idkp->dev);
44         }
45         mutex_unlock(&ide_disk_ref_mutex);
46         return idkp;
47 }
48
49 static void ide_disk_put(struct ide_disk_obj *idkp)
50 {
51         ide_drive_t *drive = idkp->drive;
52
53         mutex_lock(&ide_disk_ref_mutex);
54         put_device(&idkp->dev);
55         ide_device_put(drive);
56         mutex_unlock(&ide_disk_ref_mutex);
57 }
58
59 sector_t ide_gd_capacity(ide_drive_t *drive)
60 {
61         return drive->capacity64;
62 }
63
64 static int ide_gd_probe(ide_drive_t *);
65
66 static void ide_gd_remove(ide_drive_t *drive)
67 {
68         struct ide_disk_obj *idkp = drive->driver_data;
69         struct gendisk *g = idkp->disk;
70
71         ide_proc_unregister_driver(drive, idkp->driver);
72         device_del(&idkp->dev);
73         del_gendisk(g);
74         drive->disk_ops->flush(drive);
75
76         mutex_lock(&ide_disk_ref_mutex);
77         put_device(&idkp->dev);
78         mutex_unlock(&ide_disk_ref_mutex);
79 }
80
81 static void ide_disk_release(struct device *dev)
82 {
83         struct ide_disk_obj *idkp = to_ide_drv(dev, ide_disk_obj);
84         ide_drive_t *drive = idkp->drive;
85         struct gendisk *g = idkp->disk;
86
87         drive->disk_ops = NULL;
88         drive->driver_data = NULL;
89         g->private_data = NULL;
90         put_disk(g);
91         kfree(idkp);
92 }
93
94 /*
95  * On HPA drives the capacity needs to be
96  * reinitialized on resume otherwise the disk
97  * can not be used and a hard reset is required
98  */
99 static void ide_gd_resume(ide_drive_t *drive)
100 {
101         if (ata_id_hpa_enabled(drive->id))
102                 (void)drive->disk_ops->get_capacity(drive);
103 }
104
105 static const struct dmi_system_id ide_coldreboot_table[] = {
106         {
107                 /* Acer TravelMate 66x cuts power during reboot */
108                 .ident   = "Acer TravelMate 660",
109                 .matches = {
110                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
111                         DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 660"),
112                 },
113         },
114
115         { }     /* terminate list */
116 };
117
118 static void ide_gd_shutdown(ide_drive_t *drive)
119 {
120 #ifdef  CONFIG_ALPHA
121         /* On Alpha, halt(8) doesn't actually turn the machine off,
122            it puts you into the sort of firmware monitor. Typically,
123            it's used to boot another kernel image, so it's not much
124            different from reboot(8). Therefore, we don't need to
125            spin down the disk in this case, especially since Alpha
126            firmware doesn't handle disks in standby mode properly.
127            On the other hand, it's reasonably safe to turn the power
128            off when the shutdown process reaches the firmware prompt,
129            as the firmware initialization takes rather long time -
130            at least 10 seconds, which should be sufficient for
131            the disk to expire its write cache. */
132         if (system_state != SYSTEM_POWER_OFF) {
133 #else
134         if (system_state == SYSTEM_RESTART &&
135                 !dmi_check_system(ide_coldreboot_table)) {
136 #endif
137                 drive->disk_ops->flush(drive);
138                 return;
139         }
140
141         printk(KERN_INFO "Shutdown: %s\n", drive->name);
142
143         drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
144 }
145
146 #ifdef CONFIG_IDE_PROC_FS
147 static ide_proc_entry_t *ide_disk_proc_entries(ide_drive_t *drive)
148 {
149         return (drive->media == ide_disk) ? ide_disk_proc : ide_floppy_proc;
150 }
151
152 static const struct ide_proc_devset *ide_disk_proc_devsets(ide_drive_t *drive)
153 {
154         return (drive->media == ide_disk) ? ide_disk_settings
155                                           : ide_floppy_settings;
156 }
157 #endif
158
159 static ide_startstop_t ide_gd_do_request(ide_drive_t *drive,
160                                          struct request *rq, sector_t sector)
161 {
162         return drive->disk_ops->do_request(drive, rq, sector);
163 }
164
165 static struct ide_driver ide_gd_driver = {
166         .gen_driver = {
167                 .owner          = THIS_MODULE,
168                 .name           = "ide-gd",
169                 .bus            = &ide_bus_type,
170         },
171         .probe                  = ide_gd_probe,
172         .remove                 = ide_gd_remove,
173         .resume                 = ide_gd_resume,
174         .shutdown               = ide_gd_shutdown,
175         .version                = IDE_GD_VERSION,
176         .do_request             = ide_gd_do_request,
177 #ifdef CONFIG_IDE_PROC_FS
178         .proc_entries           = ide_disk_proc_entries,
179         .proc_devsets           = ide_disk_proc_devsets,
180 #endif
181 };
182
183 static int ide_gd_open(struct block_device *bdev, fmode_t mode)
184 {
185         struct gendisk *disk = bdev->bd_disk;
186         struct ide_disk_obj *idkp;
187         ide_drive_t *drive;
188         int ret = 0;
189
190         idkp = ide_disk_get(disk);
191         if (idkp == NULL)
192                 return -ENXIO;
193
194         drive = idkp->drive;
195
196         ide_debug_log(IDE_DBG_FUNC, "enter");
197
198         idkp->openers++;
199
200         if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
201                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
202                 /* Just in case */
203
204                 ret = drive->disk_ops->init_media(drive, disk);
205
206                 /*
207                  * Allow O_NDELAY to open a drive without a disk, or with an
208                  * unreadable disk, so that we can get the format capacity
209                  * of the drive or begin the format - Sam
210                  */
211                 if (ret && (mode & FMODE_NDELAY) == 0) {
212                         ret = -EIO;
213                         goto out_put_idkp;
214                 }
215
216                 if ((drive->dev_flags & IDE_DFLAG_WP) && (mode & FMODE_WRITE)) {
217                         ret = -EROFS;
218                         goto out_put_idkp;
219                 }
220
221                 /*
222                  * Ignore the return code from door_lock,
223                  * since the open() has already succeeded,
224                  * and the door_lock is irrelevant at this point.
225                  */
226                 drive->disk_ops->set_doorlock(drive, disk, 1);
227                 drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
228                 check_disk_change(bdev);
229         } else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) {
230                 ret = -EBUSY;
231                 goto out_put_idkp;
232         }
233         return 0;
234
235 out_put_idkp:
236         idkp->openers--;
237         ide_disk_put(idkp);
238         return ret;
239 }
240
241 static int ide_gd_unlocked_open(struct block_device *bdev, fmode_t mode)
242 {
243         int ret;
244
245         mutex_lock(&ide_gd_mutex);
246         ret = ide_gd_open(bdev, mode);
247         mutex_unlock(&ide_gd_mutex);
248
249         return ret;
250 }
251
252
253 static void ide_gd_release(struct gendisk *disk, fmode_t mode)
254 {
255         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
256         ide_drive_t *drive = idkp->drive;
257
258         ide_debug_log(IDE_DBG_FUNC, "enter");
259
260         mutex_lock(&ide_gd_mutex);
261         if (idkp->openers == 1)
262                 drive->disk_ops->flush(drive);
263
264         if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
265                 drive->disk_ops->set_doorlock(drive, disk, 0);
266                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
267         }
268
269         idkp->openers--;
270
271         ide_disk_put(idkp);
272         mutex_unlock(&ide_gd_mutex);
273 }
274
275 static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
276 {
277         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
278         ide_drive_t *drive = idkp->drive;
279
280         geo->heads = drive->bios_head;
281         geo->sectors = drive->bios_sect;
282         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
283         return 0;
284 }
285
286 static unsigned int ide_gd_check_events(struct gendisk *disk,
287                                         unsigned int clearing)
288 {
289         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
290         ide_drive_t *drive = idkp->drive;
291         bool ret;
292
293         /* do not scan partitions twice if this is a removable device */
294         if (drive->dev_flags & IDE_DFLAG_ATTACH) {
295                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
296                 return 0;
297         }
298
299         /*
300          * The following is used to force revalidation on the first open on
301          * removeable devices, and never gets reported to userland as
302          * genhd->events is 0.  This is intended as removeable ide disk
303          * can't really detect MEDIA_CHANGE events.
304          */
305         ret = drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED;
306         drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
307
308         return ret ? DISK_EVENT_MEDIA_CHANGE : 0;
309 }
310
311 static void ide_gd_unlock_native_capacity(struct gendisk *disk)
312 {
313         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
314         ide_drive_t *drive = idkp->drive;
315         const struct ide_disk_ops *disk_ops = drive->disk_ops;
316
317         if (disk_ops->unlock_native_capacity)
318                 disk_ops->unlock_native_capacity(drive);
319 }
320
321 static int ide_gd_revalidate_disk(struct gendisk *disk)
322 {
323         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
324         ide_drive_t *drive = idkp->drive;
325
326         if (ide_gd_check_events(disk, 0))
327                 drive->disk_ops->get_capacity(drive);
328
329         set_capacity(disk, ide_gd_capacity(drive));
330         return 0;
331 }
332
333 static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
334                              unsigned int cmd, unsigned long arg)
335 {
336         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
337         ide_drive_t *drive = idkp->drive;
338
339         return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
340 }
341
342 static const struct block_device_operations ide_gd_ops = {
343         .owner                  = THIS_MODULE,
344         .open                   = ide_gd_unlocked_open,
345         .release                = ide_gd_release,
346         .ioctl                  = ide_gd_ioctl,
347         .getgeo                 = ide_gd_getgeo,
348         .check_events           = ide_gd_check_events,
349         .unlock_native_capacity = ide_gd_unlock_native_capacity,
350         .revalidate_disk        = ide_gd_revalidate_disk
351 };
352
353 static int ide_gd_probe(ide_drive_t *drive)
354 {
355         const struct ide_disk_ops *disk_ops = NULL;
356         struct ide_disk_obj *idkp;
357         struct gendisk *g;
358
359         /* strstr("foo", "") is non-NULL */
360         if (!strstr("ide-gd", drive->driver_req))
361                 goto failed;
362
363 #ifdef CONFIG_IDE_GD_ATA
364         if (drive->media == ide_disk)
365                 disk_ops = &ide_ata_disk_ops;
366 #endif
367 #ifdef CONFIG_IDE_GD_ATAPI
368         if (drive->media == ide_floppy)
369                 disk_ops = &ide_atapi_disk_ops;
370 #endif
371         if (disk_ops == NULL)
372                 goto failed;
373
374         if (disk_ops->check(drive, DRV_NAME) == 0) {
375                 printk(KERN_ERR PFX "%s: not supported by this driver\n",
376                         drive->name);
377                 goto failed;
378         }
379
380         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
381         if (!idkp) {
382                 printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
383                         drive->name);
384                 goto failed;
385         }
386
387         g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
388         if (!g)
389                 goto out_free_idkp;
390
391         ide_init_disk(g, drive);
392
393         idkp->dev.parent = &drive->gendev;
394         idkp->dev.release = ide_disk_release;
395         dev_set_name(&idkp->dev, dev_name(&drive->gendev));
396
397         if (device_register(&idkp->dev))
398                 goto out_free_disk;
399
400         idkp->drive = drive;
401         idkp->driver = &ide_gd_driver;
402         idkp->disk = g;
403
404         g->private_data = &idkp->driver;
405
406         drive->driver_data = idkp;
407         drive->debug_mask = debug_mask;
408         drive->disk_ops = disk_ops;
409
410         disk_ops->setup(drive);
411
412         set_capacity(g, ide_gd_capacity(drive));
413
414         g->minors = IDE_DISK_MINORS;
415         g->driverfs_dev = &drive->gendev;
416         g->flags |= GENHD_FL_EXT_DEVT;
417         if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
418                 g->flags = GENHD_FL_REMOVABLE;
419         g->fops = &ide_gd_ops;
420         add_disk(g);
421         return 0;
422
423 out_free_disk:
424         put_disk(g);
425 out_free_idkp:
426         kfree(idkp);
427 failed:
428         return -ENODEV;
429 }
430
431 static int __init ide_gd_init(void)
432 {
433         printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
434         return driver_register(&ide_gd_driver.gen_driver);
435 }
436
437 static void __exit ide_gd_exit(void)
438 {
439         driver_unregister(&ide_gd_driver.gen_driver);
440 }
441
442 MODULE_ALIAS("ide:*m-disk*");
443 MODULE_ALIAS("ide-disk");
444 MODULE_ALIAS("ide:*m-floppy*");
445 MODULE_ALIAS("ide-floppy");
446 module_init(ide_gd_init);
447 module_exit(ide_gd_exit);
448 MODULE_LICENSE("GPL");
449 MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");