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 & 2)) {
 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");