block: push down BKL into .open and .release
[linux-2.6.git] / drivers / ide / ide-gd.c
1 #include <linux/smp_lock.h>
2 #include <linux/module.h>
3 #include <linux/types.h>
4 #include <linux/string.h>
5 #include <linux/kernel.h>
6 #include <linux/errno.h>
7 #include <linux/genhd.h>
8 #include <linux/mutex.h>
9 #include <linux/ide.h>
10 #include <linux/hdreg.h>
11 #include <linux/dmi.h>
12 #include <linux/slab.h>
13
14 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
15 #define IDE_DISK_MINORS         (1 << PARTN_BITS)
16 #else
17 #define IDE_DISK_MINORS         0
18 #endif
19
20 #include "ide-disk.h"
21 #include "ide-floppy.h"
22
23 #define IDE_GD_VERSION  "1.18"
24
25 /* module parameters */
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  * reinitilized 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         lock_kernel();
246         ret = ide_gd_open(bdev, mode);
247         unlock_kernel();
248
249         return ret;
250 }
251
252
253 static int 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         lock_kernel();
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         unlock_kernel();
273
274         return 0;
275 }
276
277 static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
278 {
279         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
280         ide_drive_t *drive = idkp->drive;
281
282         geo->heads = drive->bios_head;
283         geo->sectors = drive->bios_sect;
284         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
285         return 0;
286 }
287
288 static int ide_gd_media_changed(struct gendisk *disk)
289 {
290         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
291         ide_drive_t *drive = idkp->drive;
292         int ret;
293
294         /* do not scan partitions twice if this is a removable device */
295         if (drive->dev_flags & IDE_DFLAG_ATTACH) {
296                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
297                 return 0;
298         }
299
300         ret = !!(drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED);
301         drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
302
303         return ret;
304 }
305
306 static void ide_gd_unlock_native_capacity(struct gendisk *disk)
307 {
308         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
309         ide_drive_t *drive = idkp->drive;
310         const struct ide_disk_ops *disk_ops = drive->disk_ops;
311
312         if (disk_ops->unlock_native_capacity)
313                 disk_ops->unlock_native_capacity(drive);
314 }
315
316 static int ide_gd_revalidate_disk(struct gendisk *disk)
317 {
318         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
319         ide_drive_t *drive = idkp->drive;
320
321         if (ide_gd_media_changed(disk))
322                 drive->disk_ops->get_capacity(drive);
323
324         set_capacity(disk, ide_gd_capacity(drive));
325         return 0;
326 }
327
328 static int ide_gd_ioctl(struct block_device *bdev, fmode_t mode,
329                              unsigned int cmd, unsigned long arg)
330 {
331         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
332         ide_drive_t *drive = idkp->drive;
333
334         return drive->disk_ops->ioctl(drive, bdev, mode, cmd, arg);
335 }
336
337 static const struct block_device_operations ide_gd_ops = {
338         .owner                  = THIS_MODULE,
339         .open                   = ide_gd_unlocked_open,
340         .release                = ide_gd_release,
341         .ioctl                  = ide_gd_ioctl,
342         .getgeo                 = ide_gd_getgeo,
343         .media_changed          = ide_gd_media_changed,
344         .unlock_native_capacity = ide_gd_unlock_native_capacity,
345         .revalidate_disk        = ide_gd_revalidate_disk
346 };
347
348 static int ide_gd_probe(ide_drive_t *drive)
349 {
350         const struct ide_disk_ops *disk_ops = NULL;
351         struct ide_disk_obj *idkp;
352         struct gendisk *g;
353
354         /* strstr("foo", "") is non-NULL */
355         if (!strstr("ide-gd", drive->driver_req))
356                 goto failed;
357
358 #ifdef CONFIG_IDE_GD_ATA
359         if (drive->media == ide_disk)
360                 disk_ops = &ide_ata_disk_ops;
361 #endif
362 #ifdef CONFIG_IDE_GD_ATAPI
363         if (drive->media == ide_floppy)
364                 disk_ops = &ide_atapi_disk_ops;
365 #endif
366         if (disk_ops == NULL)
367                 goto failed;
368
369         if (disk_ops->check(drive, DRV_NAME) == 0) {
370                 printk(KERN_ERR PFX "%s: not supported by this driver\n",
371                         drive->name);
372                 goto failed;
373         }
374
375         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
376         if (!idkp) {
377                 printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
378                         drive->name);
379                 goto failed;
380         }
381
382         g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
383         if (!g)
384                 goto out_free_idkp;
385
386         ide_init_disk(g, drive);
387
388         idkp->dev.parent = &drive->gendev;
389         idkp->dev.release = ide_disk_release;
390         dev_set_name(&idkp->dev, dev_name(&drive->gendev));
391
392         if (device_register(&idkp->dev))
393                 goto out_free_disk;
394
395         idkp->drive = drive;
396         idkp->driver = &ide_gd_driver;
397         idkp->disk = g;
398
399         g->private_data = &idkp->driver;
400
401         drive->driver_data = idkp;
402         drive->debug_mask = debug_mask;
403         drive->disk_ops = disk_ops;
404
405         disk_ops->setup(drive);
406
407         set_capacity(g, ide_gd_capacity(drive));
408
409         g->minors = IDE_DISK_MINORS;
410         g->driverfs_dev = &drive->gendev;
411         g->flags |= GENHD_FL_EXT_DEVT;
412         if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
413                 g->flags = GENHD_FL_REMOVABLE;
414         g->fops = &ide_gd_ops;
415         add_disk(g);
416         return 0;
417
418 out_free_disk:
419         put_disk(g);
420 out_free_idkp:
421         kfree(idkp);
422 failed:
423         return -ENODEV;
424 }
425
426 static int __init ide_gd_init(void)
427 {
428         printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
429         return driver_register(&ide_gd_driver.gen_driver);
430 }
431
432 static void __exit ide_gd_exit(void)
433 {
434         driver_unregister(&ide_gd_driver.gen_driver);
435 }
436
437 MODULE_ALIAS("ide:*m-disk*");
438 MODULE_ALIAS("ide-disk");
439 MODULE_ALIAS("ide:*m-floppy*");
440 MODULE_ALIAS("ide-floppy");
441 module_init(ide_gd_init);
442 module_exit(ide_gd_exit);
443 MODULE_LICENSE("GPL");
444 MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");