ide-floppy_ioctl.c revision aeb5d727062a0238a2f96c9c380fbd2be4640c6f
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, 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 93static 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 114static 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 133static 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 175out: 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 191static 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 226static 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 244static int ide_floppy_format_ioctl(ide_drive_t *drive, struct file *file, 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 (!(file->f_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 263int ide_floppy_ioctl(ide_drive_t *drive, struct inode *inode, 264 struct file *file, unsigned int cmd, unsigned long arg) 265{ 266 struct block_device *bdev = inode->i_bdev; 267 struct ide_atapi_pc pc; 268 void __user *argp = (void __user *)arg; 269 int err; 270 271 if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) 272 return ide_floppy_lockdoor(drive, &pc, arg, cmd); 273 274 err = ide_floppy_format_ioctl(drive, file, cmd, argp); 275 if (err != -ENOTTY) 276 return err; 277 278 /* 279 * skip SCSI_IOCTL_SEND_COMMAND (deprecated) 280 * and CDROM_SEND_PACKET (legacy) ioctls 281 */ 282 if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND) 283 err = scsi_cmd_ioctl(file, bdev->bd_disk->queue, 284 bdev->bd_disk, cmd, argp); 285 286 if (err == -ENOTTY) 287 err = generic_ide_ioctl(drive, file, bdev, cmd, arg); 288 289 return err; 290} 291