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