drivers/ide/ide-floppy_ioctl.c

   1 /*
   2  * ide-floppy IOCTLs handling.
   3  */
   4
   5 #include <linux/kernel.h>
   6 #include <linux/ide.h>
   7 #include <linux/cdrom.h>
   8 #include <linux/mutex.h>
   9
  10 #include <asm/unaligned.h>
  11
  12 #include <scsi/scsi_ioctl.h>
  13
  14 #include "ide-floppy.h"
  15
  16 /*
  17  * Obtain the list of formattable capacities.
  18  * Very similar to ide_floppy_get_capacity, except that we push the capacity
  19  * descriptors to userland, instead of our own structures.
  20  *
  21  * Userland gives us the following structure:
  22  *
  23  * struct idefloppy_format_capacities {
  24  *      int nformats;
  25  *      struct {
  26  *              int nblocks;
  27  *              int blocksize;
  28  *      } formats[];
  29  * };
  30  *
  31  * userland initializes nformats to the number of allocated formats[] records.
  32  * On exit we set nformats to the number of records we've actually initialized.
  33  */
  34
  35 static DEFINE_MUTEX(ide_floppy_ioctl_mutex);
  36 static int ide_floppy_get_format_capacities(ide_drive_t *drive,
  37                                             struct ide_atapi_pc *pc,
  38                                             int __user *arg)
  39 {
  40         struct ide_disk_obj *floppy = drive->driver_data;
  41         int i, blocks, length, u_array_size, u_index;
  42         int __user *argp;
  43         u8 pc_buf[256], header_len, desc_cnt;
  44
  45         if (get_user(u_array_size, arg))
  46                 return -EFAULT;
  47
  48         if (u_array_size <= 0)
  49                 return -EINVAL;
  50
  51         ide_floppy_create_read_capacity_cmd(pc);
  52
  53         if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) {
  54                 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
  55                 return -EIO;
  56         }
  57
  58         header_len = pc_buf[3];
  59         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
  60
  61         u_index = 0;
  62         argp = arg + 1;
  63
  64         /*
  65          * We always skip the first capacity descriptor.  That's the current
  66          * capacity.  We are interested in the remaining descriptors, the
  67          * formattable capacities.
  68          */
  69         for (i = 1; i < desc_cnt; i++) {
  70                 unsigned int desc_start = 4 + i*8;
  71
  72                 if (u_index >= u_array_size)
  73                         break;  /* User-supplied buffer too small */
  74
  75                 blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
  76                 length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);
  77
  78                 if (put_user(blocks, argp))
  79                         return -EFAULT;
  80
  81                 ++argp;
  82
  83                 if (put_user(length, argp))
  84                         return -EFAULT;
  85
  86                 ++argp;
  87
  88                 ++u_index;
  89         }
  90
  91         if (put_user(u_index, arg))
  92                 return -EFAULT;
  93
  94         return 0;
  95 }
  96
  97 static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc,
  98                                               u8 *buf, int b, int l,
  99                                               int flags)
 100 {
 101         ide_init_pc(pc);
 102         pc->c[0] = GPCMD_FORMAT_UNIT;
 103         pc->c[1] = 0x17;
 104
 105         memset(buf, 0, 12);
 106         buf[1] = 0xA2;
 107         /* Default format list header, u8 1: FOV/DCRT/IMM bits set */
 108
 109         if (flags & 1)                          /* Verify bit on... */
 110                 buf[1] ^= 0x20;                 /* ... turn off DCRT bit */
 111         buf[3] = 8;
 112
 113         put_unaligned(cpu_to_be32(b), (unsigned int *)(&buf[4]));
 114         put_unaligned(cpu_to_be32(l), (unsigned int *)(&buf[8]));
 115         pc->req_xfer = 12;
 116         pc->flags |= PC_FLAG_WRITING;
 117 }
 118
 119 static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc)
 120 {
 121         struct ide_disk_obj *floppy = drive->driver_data;
 122         u8 buf[20];
 123
 124         drive->atapi_flags &= ~IDE_AFLAG_SRFP;
 125
 126         ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE);
 127         pc->flags |= PC_FLAG_SUPPRESS_ERROR;
 128
 129         if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
 130                 return 1;
 131
 132         if (buf[8 + 2] & 0x40)
 133                 drive->atapi_flags |= IDE_AFLAG_SRFP;
 134
 135         return 0;
 136 }
 137
 138 static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc,
 139                                   int __user *arg)
 140 {
 141         struct ide_disk_obj *floppy = drive->driver_data;
 142         u8 buf[12];
 143         int blocks, length, flags, err = 0;
 144
 145         if (floppy->openers > 1) {
 146                 /* Don't format if someone is using the disk */
 147                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
 148                 return -EBUSY;
 149         }
 150
 151         drive->dev_flags |= IDE_DFLAG_FORMAT_IN_PROGRESS;
 152
 153         /*
 154          * Send ATAPI_FORMAT_UNIT to the drive.
 155          *
 156          * Userland gives us the following structure:
 157          *
 158          * struct idefloppy_format_command {
 159          *        int nblocks;
 160          *        int blocksize;
 161          *        int flags;
 162          *        } ;
 163          *
 164          * flags is a bitmask, currently, the only defined flag is:
 165          *
 166          *        0x01 - verify media after format.
 167          */
 168         if (get_user(blocks, arg) ||
 169                         get_user(length, arg+1) ||
 170                         get_user(flags, arg+2)) {
 171                 err = -EFAULT;
 172                 goto out;
 173         }
 174
 175         ide_floppy_get_sfrp_bit(drive, pc);
 176         ide_floppy_create_format_unit_cmd(pc, buf, blocks, length, flags);
 177
 178         if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
 179                 err = -EIO;
 180
 181 out:
 182         if (err)
 183                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
 184         return err;
 185 }
 186
 187 /*
 188  * Get ATAPI_FORMAT_UNIT progress indication.
 189  *
 190  * Userland gives a pointer to an int.  The int is set to a progress
 191  * indicator 0-65536, with 65536=100%.
 192  *
 193  * If the drive does not support format progress indication, we just check
 194  * the dsc bit, and return either 0 or 65536.
 195  */
 196
 197 static int ide_floppy_get_format_progress(ide_drive_t *drive,
 198                                           struct ide_atapi_pc *pc,
 199                                           int __user *arg)
 200 {
 201         struct ide_disk_obj *floppy = drive->driver_data;
 202         u8 sense_buf[18];
 203         int progress_indication = 0x10000;
 204
 205         if (drive->atapi_flags & IDE_AFLAG_SRFP) {
 206                 ide_create_request_sense_cmd(drive, pc);
 207                 if (ide_queue_pc_tail(drive, floppy->disk, pc, sense_buf,
 208                                       pc->req_xfer))
 209                         return -EIO;
 210
 211                 if (floppy->sense_key == 2 &&
 212                     floppy->asc == 4 &&
 213                     floppy->ascq == 4)
 214                         progress_indication = floppy->progress_indication;
 215
 216                 /* Else assume format_unit has finished, and we're at 0x10000 */
 217         } else {
 218                 ide_hwif_t *hwif = drive->hwif;
 219                 unsigned long flags;
 220                 u8 stat;
 221
 222                 local_irq_save(flags);
 223                 stat = hwif->tp_ops->read_status(hwif);
 224                 local_irq_restore(flags);
 225
 226                 progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
 227         }
 228
 229         if (put_user(progress_indication, arg))
 230                 return -EFAULT;
 231
 232         return 0;
 233 }
 234
 235 static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
 236                                unsigned long arg, unsigned int cmd)
 237 {
 238         struct ide_disk_obj *floppy = drive->driver_data;
 239         struct gendisk *disk = floppy->disk;
 240         int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
 241
 242         if (floppy->openers > 1)
 243                 return -EBUSY;
 244
 245         ide_set_media_lock(drive, disk, prevent);
 246
 247         if (cmd == CDROMEJECT)
 248                 ide_do_start_stop(drive, disk, 2);
 249
 250         return 0;
 251 }
 252
 253 static int ide_floppy_format_ioctl(ide_drive_t *drive, struct ide_atapi_pc *pc,
 254                                    fmode_t mode, unsigned int cmd,
 255                                    void __user *argp)
 256 {
 257         switch (cmd) {
 258         case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
 259                 return 0;
 260         case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
 261                 return ide_floppy_get_format_capacities(drive, pc, argp);
 262         case IDEFLOPPY_IOCTL_FORMAT_START:
 263                 if (!(mode & FMODE_WRITE))
 264                         return -EPERM;
 265                 return ide_floppy_format_unit(drive, pc, (int __user *)argp);
 266         case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
 267                 return ide_floppy_get_format_progress(drive, pc, argp);
 268         default:
 269                 return -ENOTTY;
 270         }
 271 }
 272
 273 int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
 274                      fmode_t mode, unsigned int cmd, unsigned long arg)
 275 {
 276         struct ide_atapi_pc pc;
 277         void __user *argp = (void __user *)arg;
 278         int err;
 279
 280         mutex_lock(&ide_floppy_ioctl_mutex);
 281         if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) {
 282                 err = ide_floppy_lockdoor(drive, &pc, arg, cmd);
 283                 goto out;
 284         }
 285
 286         err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
 287         if (err != -ENOTTY)
 288                 goto out;
 289
 290         /*
 291          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
 292          * and CDROM_SEND_PACKET (legacy) ioctls
 293          */
 294         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
 295                 err = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
 296
 297         if (err == -ENOTTY)
 298                 err = generic_ide_ioctl(drive, bdev, cmd, arg);
 299
 300 out:
 301         mutex_unlock(&ide_floppy_ioctl_mutex);
 302         return err;
 303 }