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