drivers/ide/ide-floppy_ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ide-floppy IOCTLs handling.
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/ide.h>
   8 #include <linux/compat.h>
   9 #include <linux/cdrom.h>
  10 #include <linux/mutex.h>
  11
  12 #include <asm/unaligned.h>
  13
  14 #include <scsi/scsi_ioctl.h>
  15
  16 #include "ide-floppy.h"
  17
  18 /*
  19  * Obtain the list of formattable capacities.
  20  * Very similar to ide_floppy_get_capacity, except that we push the capacity
  21  * descriptors to userland, instead of our own structures.
  22  *
  23  * Userland gives us the following structure:
  24  *
  25  * struct idefloppy_format_capacities {
  26  *      int nformats;
  27  *      struct {
  28  *              int nblocks;
  29  *              int blocksize;
  30  *      } formats[];
  31  * };
  32  *
  33  * userland initializes nformats to the number of allocated formats[] records.
  34  * On exit we set nformats to the number of records we've actually initialized.
  35  */
  36
  37 static DEFINE_MUTEX(ide_floppy_ioctl_mutex);
  38 static int ide_floppy_get_format_capacities(ide_drive_t *drive,
  39                                             struct ide_atapi_pc *pc,
  40                                             int __user *arg)
  41 {
  42         struct ide_disk_obj *floppy = drive->driver_data;
  43         int i, blocks, length, u_array_size, u_index;
  44         int __user *argp;
  45         u8 pc_buf[256], header_len, desc_cnt;
  46
  47         if (get_user(u_array_size, arg))
  48                 return -EFAULT;
  49
  50         if (u_array_size <= 0)
  51                 return -EINVAL;
  52
  53         ide_floppy_create_read_capacity_cmd(pc);
  54
  55         if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) {
  56                 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
  57                 return -EIO;
  58         }
  59
  60         header_len = pc_buf[3];
  61         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
  62
  63         u_index = 0;
  64         argp = arg + 1;
  65
  66         /*
  67          * We always skip the first capacity descriptor.  That's the current
  68          * capacity.  We are interested in the remaining descriptors, the
  69          * formattable capacities.
  70          */
  71         for (i = 1; i < desc_cnt; i++) {
  72                 unsigned int desc_start = 4 + i*8;
  73
  74                 if (u_index >= u_array_size)
  75                         break;  /* User-supplied buffer too small */
  76
  77                 blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
  78                 length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);
  79
  80                 if (put_user(blocks, argp))
  81                         return -EFAULT;
  82
  83                 ++argp;
  84
  85                 if (put_user(length, argp))
  86                         return -EFAULT;
  87
  88                 ++argp;
  89
  90                 ++u_index;
  91         }
  92
  93         if (put_user(u_index, arg))
  94                 return -EFAULT;
  95
  96         return 0;
  97 }
  98
  99 static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc,
 100                                               u8 *buf, int b, int l,
 101                                               int flags)
 102 {
 103         ide_init_pc(pc);
 104         pc->c[0] = GPCMD_FORMAT_UNIT;
 105         pc->c[1] = 0x17;
 106
 107         memset(buf, 0, 12);
 108         buf[1] = 0xA2;
 109         /* Default format list header, u8 1: FOV/DCRT/IMM bits set */
 110
 111         if (flags & 1)                          /* Verify bit on... */
 112                 buf[1] ^= 0x20;                 /* ... turn off DCRT bit */
 113         buf[3] = 8;
 114
 115         put_unaligned(cpu_to_be32(b), (unsigned int *)(&buf[4]));
 116         put_unaligned(cpu_to_be32(l), (unsigned int *)(&buf[8]));
 117         pc->req_xfer = 12;
 118         pc->flags |= PC_FLAG_WRITING;
 119 }
 120
 121 static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc)
 122 {
 123         struct ide_disk_obj *floppy = drive->driver_data;
 124         u8 buf[20];
 125
 126         drive->atapi_flags &= ~IDE_AFLAG_SRFP;
 127
 128         ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE);
 129         pc->flags |= PC_FLAG_SUPPRESS_ERROR;
 130
 131         if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
 132                 return 1;
 133
 134         if (buf[8 + 2] & 0x40)
 135                 drive->atapi_flags |= IDE_AFLAG_SRFP;
 136
 137         return 0;
 138 }
 139
 140 static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc,
 141                                   int __user *arg)
 142 {
 143         struct ide_disk_obj *floppy = drive->driver_data;
 144         u8 buf[12];
 145         int blocks, length, flags, err = 0;
 146
 147         if (floppy->openers > 1) {
 148                 /* Don't format if someone is using the disk */
 149                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
 150                 return -EBUSY;
 151         }
 152
 153         drive->dev_flags |= IDE_DFLAG_FORMAT_IN_PROGRESS;
 154
 155         /*
 156          * Send ATAPI_FORMAT_UNIT to the drive.
 157          *
 158          * Userland gives us the following structure:
 159          *
 160          * struct idefloppy_format_command {
 161          *        int nblocks;
 162          *        int blocksize;
 163          *        int flags;
 164          *        } ;
 165          *
 166          * flags is a bitmask, currently, the only defined flag is:
 167          *
 168          *        0x01 - verify media after format.
 169          */
 170         if (get_user(blocks, arg) ||
 171                         get_user(length, arg+1) ||
 172                         get_user(flags, arg+2)) {
 173                 err = -EFAULT;
 174                 goto out;
 175         }
 176
 177         ide_floppy_get_sfrp_bit(drive, pc);
 178         ide_floppy_create_format_unit_cmd(pc, buf, blocks, length, flags);
 179
 180         if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer))
 181                 err = -EIO;
 182
 183 out:
 184         if (err)
 185                 drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
 186         return err;
 187 }
 188
 189 /*
 190  * Get ATAPI_FORMAT_UNIT progress indication.
 191  *
 192  * Userland gives a pointer to an int.  The int is set to a progress
 193  * indicator 0-65536, with 65536=100%.
 194  *
 195  * If the drive does not support format progress indication, we just check
 196  * the dsc bit, and return either 0 or 65536.
 197  */
 198
 199 static int ide_floppy_get_format_progress(ide_drive_t *drive,
 200                                           struct ide_atapi_pc *pc,
 201                                           int __user *arg)
 202 {
 203         struct ide_disk_obj *floppy = drive->driver_data;
 204         u8 sense_buf[18];
 205         int progress_indication = 0x10000;
 206
 207         if (drive->atapi_flags & IDE_AFLAG_SRFP) {
 208                 ide_create_request_sense_cmd(drive, pc);
 209                 if (ide_queue_pc_tail(drive, floppy->disk, pc, sense_buf,
 210                                       pc->req_xfer))
 211                         return -EIO;
 212
 213                 if (floppy->sense_key == 2 &&
 214                     floppy->asc == 4 &&
 215                     floppy->ascq == 4)
 216                         progress_indication = floppy->progress_indication;
 217
 218                 /* Else assume format_unit has finished, and we're at 0x10000 */
 219         } else {
 220                 ide_hwif_t *hwif = drive->hwif;
 221                 unsigned long flags;
 222                 u8 stat;
 223
 224                 local_irq_save(flags);
 225                 stat = hwif->tp_ops->read_status(hwif);
 226                 local_irq_restore(flags);
 227
 228                 progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
 229         }
 230
 231         if (put_user(progress_indication, arg))
 232                 return -EFAULT;
 233
 234         return 0;
 235 }
 236
 237 static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
 238                                unsigned long arg, unsigned int cmd)
 239 {
 240         struct ide_disk_obj *floppy = drive->driver_data;
 241         struct gendisk *disk = floppy->disk;
 242         int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
 243
 244         if (floppy->openers > 1)
 245                 return -EBUSY;
 246
 247         ide_set_media_lock(drive, disk, prevent);
 248
 249         if (cmd == CDROMEJECT)
 250                 ide_do_start_stop(drive, disk, 2);
 251
 252         return 0;
 253 }
 254
 255 static int ide_floppy_format_ioctl(ide_drive_t *drive, struct ide_atapi_pc *pc,
 256                                    fmode_t mode, unsigned int cmd,
 257                                    void __user *argp)
 258 {
 259         switch (cmd) {
 260         case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
 261                 return 0;
 262         case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
 263                 return ide_floppy_get_format_capacities(drive, pc, argp);
 264         case IDEFLOPPY_IOCTL_FORMAT_START:
 265                 if (!(mode & FMODE_WRITE))
 266                         return -EPERM;
 267                 return ide_floppy_format_unit(drive, pc, (int __user *)argp);
 268         case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
 269                 return ide_floppy_get_format_progress(drive, pc, argp);
 270         default:
 271                 return -ENOTTY;
 272         }
 273 }
 274
 275 int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
 276                      fmode_t mode, unsigned int cmd, unsigned long arg)
 277 {
 278         struct ide_atapi_pc pc;
 279         void __user *argp = (void __user *)arg;
 280         int err;
 281
 282         mutex_lock(&ide_floppy_ioctl_mutex);
 283         if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) {
 284                 err = ide_floppy_lockdoor(drive, &pc, arg, cmd);
 285                 goto out;
 286         }
 287
 288         err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
 289         if (err != -ENOTTY)
 290                 goto out;
 291
 292         /*
 293          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
 294          * and CDROM_SEND_PACKET (legacy) ioctls
 295          */
 296         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
 297                 err = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
 298
 299         if (err == -ENOTTY)
 300                 err = generic_ide_ioctl(drive, bdev, cmd, arg);
 301
 302 out:
 303         mutex_unlock(&ide_floppy_ioctl_mutex);
 304         return err;
 305 }
 306
 307 #ifdef CONFIG_COMPAT
 308 int ide_floppy_compat_ioctl(ide_drive_t *drive, struct block_device *bdev,
 309                             fmode_t mode, unsigned int cmd, unsigned long arg)
 310 {
 311         struct ide_atapi_pc pc;
 312         void __user *argp = compat_ptr(arg);
 313         int err;
 314
 315         mutex_lock(&ide_floppy_ioctl_mutex);
 316         if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) {
 317                 err = ide_floppy_lockdoor(drive, &pc, arg, cmd);
 318                 goto out;
 319         }
 320
 321         err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp);
 322         if (err != -ENOTTY)
 323                 goto out;
 324
 325         /*
 326          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
 327          * and CDROM_SEND_PACKET (legacy) ioctls
 328          */
 329         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
 330                 err = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
 331
 332         if (err == -ENOTTY)
 333                 err = generic_ide_ioctl(drive, bdev, cmd, arg);
 334
 335 out:
 336         mutex_unlock(&ide_floppy_ioctl_mutex);
 337         return err;
 338 }
 339 #endif