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, int __user *arg)
  35 {
  36         struct ide_disk_obj *floppy = drive->driver_data;
  37         struct ide_atapi_pc pc;
  38         u8 header_len, desc_cnt;
  39         int i, blocks, length, u_array_size, u_index;
  40         int __user *argp;
  41
  42         if (get_user(u_array_size, arg))
  43                 return -EFAULT;
  44
  45         if (u_array_size <= 0)
  46                 return -EINVAL;
  47
  48         ide_floppy_create_read_capacity_cmd(&pc);
  49         if (ide_queue_pc_tail(drive, floppy->disk, &pc)) {
  50                 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
  51                 return -EIO;
  52         }
  53
  54         header_len = pc.buf[3];
  55         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
  56
  57         u_index = 0;
  58         argp = arg + 1;
  59
  60         /*
  61          * We always skip the first capacity descriptor.  That's the current
  62          * capacity.  We are interested in the remaining descriptors, the
  63          * formattable capacities.
  64          */
  65         for (i = 1; i < desc_cnt; i++) {
  66                 unsigned int desc_start = 4 + i*8;
  67
  68                 if (u_index >= u_array_size)
  69                         break;  /* User-supplied buffer too small */
  70
  71                 blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
  72                 length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
  73
  74                 if (put_user(blocks, argp))
  75                         return -EFAULT;
  76
  77                 ++argp;
  78
  79                 if (put_user(length, argp))
  80                         return -EFAULT;
  81
  82                 ++argp;
  83
  84                 ++u_index;
  85         }
  86
  87         if (put_user(u_index, arg))
  88                 return -EFAULT;
  89
  90         return 0;
  91 }
  92
  93 static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc, int b,
  94                 int l, int flags)
  95 {
  96         ide_init_pc(pc);
  97         pc->c[0] = GPCMD_FORMAT_UNIT;
  98         pc->c[1] = 0x17;
  99
 100         memset(pc->buf, 0, 12);
 101         pc->buf[1] = 0xA2;
 102         /* Default format list header, u8 1: FOV/DCRT/IMM bits set */
 103
 104         if (flags & 1)                          /* Verify bit on... */
 105                 pc->buf[1] ^= 0x20;             /* ... turn off DCRT bit */
 106         pc->buf[3] = 8;
 107
 108         put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4]));
 109         put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8]));
 110         pc->buf_size = 12;
 111         pc->flags |= PC_FLAG_WRITING;
 112 }
 113
 114 static int ide_floppy_get_sfrp_bit(ide_drive_t *drive)
 115 {
 116         struct ide_disk_obj *floppy = drive->driver_data;
 117         struct ide_atapi_pc pc;
 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, int __user *arg)
 134 {
 135         struct ide_disk_obj *floppy = drive->driver_data;
 136         struct ide_atapi_pc pc;
 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         (void)ide_floppy_get_sfrp_bit(drive);
 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, int __user *arg)
 192 {
 193         struct ide_disk_obj *floppy = drive->driver_data;
 194         struct ide_atapi_pc pc;
 195         int progress_indication = 0x10000;
 196
 197         if (drive->atapi_flags & IDE_AFLAG_SRFP) {
 198                 ide_create_request_sense_cmd(drive, &pc);
 199                 if (ide_queue_pc_tail(drive, floppy->disk, &pc))
 200                         return -EIO;
 201
 202                 if (floppy->sense_key == 2 &&
 203                     floppy->asc == 4 &&
 204                     floppy->ascq == 4)
 205                         progress_indication = floppy->progress_indication;
 206
 207                 /* Else assume format_unit has finished, and we're at 0x10000 */
 208         } else {
 209                 ide_hwif_t *hwif = drive->hwif;
 210                 unsigned long flags;
 211                 u8 stat;
 212
 213                 local_irq_save(flags);
 214                 stat = hwif->tp_ops->read_status(hwif);
 215                 local_irq_restore(flags);
 216
 217                 progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
 218         }
 219
 220         if (put_user(progress_indication, arg))
 221                 return -EFAULT;
 222
 223         return 0;
 224 }
 225
 226 static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
 227                                unsigned long arg, unsigned int cmd)
 228 {
 229         struct ide_disk_obj *floppy = drive->driver_data;
 230         struct gendisk *disk = floppy->disk;
 231         int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
 232
 233         if (floppy->openers > 1)
 234                 return -EBUSY;
 235
 236         ide_set_media_lock(drive, disk, prevent);
 237
 238         if (cmd == CDROMEJECT)
 239                 ide_do_start_stop(drive, disk, 2);
 240
 241         return 0;
 242 }
 243
 244 static int ide_floppy_format_ioctl(ide_drive_t *drive, fmode_t mode,
 245                                    unsigned int cmd, void __user *argp)
 246 {
 247         switch (cmd) {
 248         case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
 249                 return 0;
 250         case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
 251                 return ide_floppy_get_format_capacities(drive, argp);
 252         case IDEFLOPPY_IOCTL_FORMAT_START:
 253                 if (!(mode & FMODE_WRITE))
 254                         return -EPERM;
 255                 return ide_floppy_format_unit(drive, (int __user *)argp);
 256         case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
 257                 return ide_floppy_get_format_progress(drive, argp);
 258         default:
 259                 return -ENOTTY;
 260         }
 261 }
 262
 263 int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
 264                      fmode_t mode, unsigned int cmd, unsigned long arg)
 265 {
 266         struct ide_atapi_pc pc;
 267         void __user *argp = (void __user *)arg;
 268         int err;
 269
 270         if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR)
 271                 return ide_floppy_lockdoor(drive, &pc, arg, cmd);
 272
 273         err = ide_floppy_format_ioctl(drive, mode, cmd, argp);
 274         if (err != -ENOTTY)
 275                 return err;
 276
 277         /*
 278          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
 279          * and CDROM_SEND_PACKET (legacy) ioctls
 280          */
 281         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
 282                 err = scsi_cmd_ioctl(bdev->bd_disk->queue, bdev->bd_disk,
 283                                 mode, cmd, argp);
 284
 285         if (err == -ENOTTY)
 286                 err = generic_ide_ioctl(drive, bdev, cmd, arg);
 287
 288         return err;
 289 }