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