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