d367473098f91052462d88a995996a154be19e56
[linux-2.6.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
11 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
12 #define IDE_DISK_MINORS         (1 << PARTN_BITS)
13 #else
14 #define IDE_DISK_MINORS         0
15 #endif
16
17 #include "ide-disk.h"
18 #include "ide-floppy.h"
19
20 #define IDE_GD_VERSION  "1.18"
21
22 /* module parameters */
23 static unsigned long debug_mask;
24 module_param(debug_mask, ulong, 0644);
25
26 static DEFINE_MUTEX(ide_disk_ref_mutex);
27
28 static void ide_disk_release(struct kref *);
29
30 static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
31 {
32         struct ide_disk_obj *idkp = NULL;
33
34         mutex_lock(&ide_disk_ref_mutex);
35         idkp = ide_drv_g(disk, ide_disk_obj);
36         if (idkp) {
37                 if (ide_device_get(idkp->drive))
38                         idkp = NULL;
39                 else
40                         kref_get(&idkp->kref);
41         }
42         mutex_unlock(&ide_disk_ref_mutex);
43         return idkp;
44 }
45
46 static void ide_disk_put(struct ide_disk_obj *idkp)
47 {
48         ide_drive_t *drive = idkp->drive;
49
50         mutex_lock(&ide_disk_ref_mutex);
51         kref_put(&idkp->kref, ide_disk_release);
52         ide_device_put(drive);
53         mutex_unlock(&ide_disk_ref_mutex);
54 }
55
56 sector_t ide_gd_capacity(ide_drive_t *drive)
57 {
58         return drive->capacity64;
59 }
60
61 static int ide_gd_probe(ide_drive_t *);
62
63 static void ide_gd_remove(ide_drive_t *drive)
64 {
65         struct ide_disk_obj *idkp = drive->driver_data;
66         struct gendisk *g = idkp->disk;
67
68         ide_proc_unregister_driver(drive, idkp->driver);
69
70         del_gendisk(g);
71
72         drive->disk_ops->flush(drive);
73
74         ide_disk_put(idkp);
75 }
76
77 static void ide_disk_release(struct kref *kref)
78 {
79         struct ide_disk_obj *idkp = to_ide_drv(kref, ide_disk_obj);
80         ide_drive_t *drive = idkp->drive;
81         struct gendisk *g = idkp->disk;
82
83         drive->disk_ops = NULL;
84         drive->driver_data = NULL;
85         g->private_data = NULL;
86         put_disk(g);
87         kfree(idkp);
88 }
89
90 /*
91  * On HPA drives the capacity needs to be
92  * reinitilized on resume otherwise the disk
93  * can not be used and a hard reset is required
94  */
95 static void ide_gd_resume(ide_drive_t *drive)
96 {
97         if (ata_id_hpa_enabled(drive->id))
98                 (void)drive->disk_ops->get_capacity(drive);
99 }
100
101 static void ide_gd_shutdown(ide_drive_t *drive)
102 {
103 #ifdef  CONFIG_ALPHA
104         /* On Alpha, halt(8) doesn't actually turn the machine off,
105            it puts you into the sort of firmware monitor. Typically,
106            it's used to boot another kernel image, so it's not much
107            different from reboot(8). Therefore, we don't need to
108            spin down the disk in this case, especially since Alpha
109            firmware doesn't handle disks in standby mode properly.
110            On the other hand, it's reasonably safe to turn the power
111            off when the shutdown process reaches the firmware prompt,
112            as the firmware initialization takes rather long time -
113            at least 10 seconds, which should be sufficient for
114            the disk to expire its write cache. */
115         if (system_state != SYSTEM_POWER_OFF) {
116 #else
117         if (system_state == SYSTEM_RESTART) {
118 #endif
119                 drive->disk_ops->flush(drive);
120                 return;
121         }
122
123         printk(KERN_INFO "Shutdown: %s\n", drive->name);
124
125         drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
126 }
127
128 #ifdef CONFIG_IDE_PROC_FS
129 static ide_proc_entry_t *ide_disk_proc_entries(ide_drive_t *drive)
130 {
131         return (drive->media == ide_disk) ? ide_disk_proc : ide_floppy_proc;
132 }
133
134 static const struct ide_proc_devset *ide_disk_proc_devsets(ide_drive_t *drive)
135 {
136         return (drive->media == ide_disk) ? ide_disk_settings
137                                           : ide_floppy_settings;
138 }
139 #endif
140
141 static ide_startstop_t ide_gd_do_request(ide_drive_t *drive,
142                                          struct request *rq, sector_t sector)
143 {
144         return drive->disk_ops->do_request(drive, rq, sector);
145 }
146
147 static int ide_gd_end_request(ide_drive_t *drive, int uptodate, int nrsecs)
148 {
149         return drive->disk_ops->end_request(drive, uptodate, nrsecs);
150 }
151
152 static ide_driver_t ide_gd_driver = {
153         .gen_driver = {
154                 .owner          = THIS_MODULE,
155                 .name           = "ide-gd",
156                 .bus            = &ide_bus_type,
157         },
158         .probe                  = ide_gd_probe,
159         .remove                 = ide_gd_remove,
160         .resume                 = ide_gd_resume,
161         .shutdown               = ide_gd_shutdown,
162         .version                = IDE_GD_VERSION,
163         .do_request             = ide_gd_do_request,
164         .end_request            = ide_gd_end_request,
165         .error                  = __ide_error,
166 #ifdef CONFIG_IDE_PROC_FS
167         .proc_entries           = ide_disk_proc_entries,
168         .proc_devsets           = ide_disk_proc_devsets,
169 #endif
170 };
171
172 static int ide_gd_open(struct inode *inode, struct file *filp)
173 {
174         struct gendisk *disk = inode->i_bdev->bd_disk;
175         struct ide_disk_obj *idkp;
176         ide_drive_t *drive;
177         int ret = 0;
178
179         idkp = ide_disk_get(disk);
180         if (idkp == NULL)
181                 return -ENXIO;
182
183         drive = idkp->drive;
184
185         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
186
187         idkp->openers++;
188
189         if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
190                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
191                 /* Just in case */
192
193                 ret = drive->disk_ops->init_media(drive, disk);
194
195                 /*
196                  * Allow O_NDELAY to open a drive without a disk, or with an
197                  * unreadable disk, so that we can get the format capacity
198                  * of the drive or begin the format - Sam
199                  */
200                 if (ret && (filp->f_flags & O_NDELAY) == 0) {
201                         ret = -EIO;
202                         goto out_put_idkp;
203                 }
204
205                 if ((drive->dev_flags & IDE_DFLAG_WP) && (filp->f_mode & FMODE_WRITE)) {
206                         ret = -EROFS;
207                         goto out_put_idkp;
208                 }
209
210                 /*
211                  * Ignore the return code from door_lock,
212                  * since the open() has already succeeded,
213                  * and the door_lock is irrelevant at this point.
214                  */
215                 drive->disk_ops->set_doorlock(drive, disk, 1);
216                 drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
217                 check_disk_change(inode->i_bdev);
218         } else if (drive->dev_flags & IDE_DFLAG_FORMAT_IN_PROGRESS) {
219                 ret = -EBUSY;
220                 goto out_put_idkp;
221         }
222         return 0;
223
224 out_put_idkp:
225         idkp->openers--;
226         ide_disk_put(idkp);
227         return ret;
228 }
229
230 static int ide_gd_release(struct inode *inode, struct file *filp)
231 {
232         struct gendisk *disk = inode->i_bdev->bd_disk;
233         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
234         ide_drive_t *drive = idkp->drive;
235
236         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
237
238         if (idkp->openers == 1)
239                 drive->disk_ops->flush(drive);
240
241         if ((drive->dev_flags & IDE_DFLAG_REMOVABLE) && idkp->openers == 1) {
242                 drive->disk_ops->set_doorlock(drive, disk, 0);
243                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
244         }
245
246         idkp->openers--;
247
248         ide_disk_put(idkp);
249
250         return 0;
251 }
252
253 static int ide_gd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
254 {
255         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
256         ide_drive_t *drive = idkp->drive;
257
258         geo->heads = drive->bios_head;
259         geo->sectors = drive->bios_sect;
260         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
261         return 0;
262 }
263
264 static int ide_gd_media_changed(struct gendisk *disk)
265 {
266         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
267         ide_drive_t *drive = idkp->drive;
268         int ret;
269
270         /* do not scan partitions twice if this is a removable device */
271         if (drive->dev_flags & IDE_DFLAG_ATTACH) {
272                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
273                 return 0;
274         }
275
276         ret = !!(drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED);
277         drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
278
279         return ret;
280 }
281
282 static int ide_gd_revalidate_disk(struct gendisk *disk)
283 {
284         struct ide_disk_obj *idkp = ide_drv_g(disk, ide_disk_obj);
285         set_capacity(disk, ide_gd_capacity(idkp->drive));
286         return 0;
287 }
288
289 static int ide_gd_ioctl(struct inode *inode, struct file *file,
290                              unsigned int cmd, unsigned long arg)
291 {
292         struct block_device *bdev = inode->i_bdev;
293         struct ide_disk_obj *idkp = ide_drv_g(bdev->bd_disk, ide_disk_obj);
294         ide_drive_t *drive = idkp->drive;
295
296         return drive->disk_ops->ioctl(drive, inode, file, cmd, arg);
297 }
298
299 static struct block_device_operations ide_gd_ops = {
300         .owner                  = THIS_MODULE,
301         .open                   = ide_gd_open,
302         .release                = ide_gd_release,
303         .ioctl                  = ide_gd_ioctl,
304         .getgeo                 = ide_gd_getgeo,
305         .media_changed          = ide_gd_media_changed,
306         .revalidate_disk        = ide_gd_revalidate_disk
307 };
308
309 static int ide_gd_probe(ide_drive_t *drive)
310 {
311         const struct ide_disk_ops *disk_ops = NULL;
312         struct ide_disk_obj *idkp;
313         struct gendisk *g;
314
315         /* strstr("foo", "") is non-NULL */
316         if (!strstr("ide-gd", drive->driver_req))
317                 goto failed;
318
319 #ifdef CONFIG_IDE_GD_ATA
320         if (drive->media == ide_disk)
321                 disk_ops = &ide_ata_disk_ops;
322 #endif
323 #ifdef CONFIG_IDE_GD_ATAPI
324         if (drive->media == ide_floppy)
325                 disk_ops = &ide_atapi_disk_ops;
326 #endif
327         if (disk_ops == NULL)
328                 goto failed;
329
330         if (disk_ops->check(drive, DRV_NAME) == 0) {
331                 printk(KERN_ERR PFX "%s: not supported by this driver\n",
332                         drive->name);
333                 goto failed;
334         }
335
336         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
337         if (!idkp) {
338                 printk(KERN_ERR PFX "%s: can't allocate a disk structure\n",
339                         drive->name);
340                 goto failed;
341         }
342
343         g = alloc_disk_node(IDE_DISK_MINORS, hwif_to_node(drive->hwif));
344         if (!g)
345                 goto out_free_idkp;
346
347         ide_init_disk(g, drive);
348
349         kref_init(&idkp->kref);
350
351         idkp->drive = drive;
352         idkp->driver = &ide_gd_driver;
353         idkp->disk = g;
354
355         g->private_data = &idkp->driver;
356
357         drive->driver_data = idkp;
358         drive->debug_mask = debug_mask;
359         drive->disk_ops = disk_ops;
360
361         disk_ops->setup(drive);
362
363         set_capacity(g, ide_gd_capacity(drive));
364
365         g->minors = IDE_DISK_MINORS;
366         g->driverfs_dev = &drive->gendev;
367         g->flags |= GENHD_FL_EXT_DEVT;
368         if (drive->dev_flags & IDE_DFLAG_REMOVABLE)
369                 g->flags = GENHD_FL_REMOVABLE;
370         g->fops = &ide_gd_ops;
371         add_disk(g);
372         return 0;
373
374 out_free_idkp:
375         kfree(idkp);
376 failed:
377         return -ENODEV;
378 }
379
380 static int __init ide_gd_init(void)
381 {
382         printk(KERN_INFO DRV_NAME " driver " IDE_GD_VERSION "\n");
383         return driver_register(&ide_gd_driver.gen_driver);
384 }
385
386 static void __exit ide_gd_exit(void)
387 {
388         driver_unregister(&ide_gd_driver.gen_driver);
389 }
390
391 MODULE_ALIAS("ide:*m-disk*");
392 MODULE_ALIAS("ide-disk");
393 MODULE_ALIAS("ide:*m-floppy*");
394 MODULE_ALIAS("ide-floppy");
395 module_init(ide_gd_init);
396 module_exit(ide_gd_exit);
397 MODULE_LICENSE("GPL");
398 MODULE_DESCRIPTION("generic ATA/ATAPI disk driver");