ide-floppy_ioctl.c revision 5a0e43b5e2ee9a295f864c38f0e853b1a4fc3892
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 34static 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, pc->req_xfer)) { 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 97static 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 118static 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, pc->req_xfer)) 128 return 1; 129 130 if (pc->buf[8 + 2] & 0x40) 131 drive->atapi_flags |= IDE_AFLAG_SRFP; 132 133 return 0; 134} 135 136static 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, pc->req_xfer)) 176 err = -EIO; 177 178out: 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 194static 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, pc->req_xfer)) 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 230static 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 248static 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 268int 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} 295