ide-floppy_ioctl.c revision 802e663427b16c77368a4fb2f77c105fbfffd68c
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_size = sizeof(pc_buf); 51 52 if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) { 53 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n"); 54 return -EIO; 55 } 56 57 header_len = pc_buf[3]; 58 desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */ 59 60 u_index = 0; 61 argp = arg + 1; 62 63 /* 64 * We always skip the first capacity descriptor. That's the current 65 * capacity. We are interested in the remaining descriptors, the 66 * formattable capacities. 67 */ 68 for (i = 1; i < desc_cnt; i++) { 69 unsigned int desc_start = 4 + i*8; 70 71 if (u_index >= u_array_size) 72 break; /* User-supplied buffer too small */ 73 74 blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]); 75 length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]); 76 77 if (put_user(blocks, argp)) 78 return -EFAULT; 79 80 ++argp; 81 82 if (put_user(length, argp)) 83 return -EFAULT; 84 85 ++argp; 86 87 ++u_index; 88 } 89 90 if (put_user(u_index, arg)) 91 return -EFAULT; 92 93 return 0; 94} 95 96static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc, int b, 97 int l, int flags) 98{ 99 ide_init_pc(pc); 100 pc->c[0] = GPCMD_FORMAT_UNIT; 101 pc->c[1] = 0x17; 102 103 memset(pc->buf, 0, 12); 104 pc->buf[1] = 0xA2; 105 /* Default format list header, u8 1: FOV/DCRT/IMM bits set */ 106 107 if (flags & 1) /* Verify bit on... */ 108 pc->buf[1] ^= 0x20; /* ... turn off DCRT bit */ 109 pc->buf[3] = 8; 110 111 put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4])); 112 put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8])); 113 pc->buf_size = 12; 114 pc->flags |= PC_FLAG_WRITING; 115} 116 117static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc) 118{ 119 struct ide_disk_obj *floppy = drive->driver_data; 120 u8 buf[20]; 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, buf, pc->req_xfer)) 128 return 1; 129 130 if (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->buf, 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->buf, 204 pc->req_xfer)) 205 return -EIO; 206 207 if (floppy->sense_key == 2 && 208 floppy->asc == 4 && 209 floppy->ascq == 4) 210 progress_indication = floppy->progress_indication; 211 212 /* Else assume format_unit has finished, and we're at 0x10000 */ 213 } else { 214 ide_hwif_t *hwif = drive->hwif; 215 unsigned long flags; 216 u8 stat; 217 218 local_irq_save(flags); 219 stat = hwif->tp_ops->read_status(hwif); 220 local_irq_restore(flags); 221 222 progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000; 223 } 224 225 if (put_user(progress_indication, arg)) 226 return -EFAULT; 227 228 return 0; 229} 230 231static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc, 232 unsigned long arg, unsigned int cmd) 233{ 234 struct ide_disk_obj *floppy = drive->driver_data; 235 struct gendisk *disk = floppy->disk; 236 int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0; 237 238 if (floppy->openers > 1) 239 return -EBUSY; 240 241 ide_set_media_lock(drive, disk, prevent); 242 243 if (cmd == CDROMEJECT) 244 ide_do_start_stop(drive, disk, 2); 245 246 return 0; 247} 248 249static int ide_floppy_format_ioctl(ide_drive_t *drive, struct ide_atapi_pc *pc, 250 fmode_t mode, unsigned int cmd, 251 void __user *argp) 252{ 253 switch (cmd) { 254 case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED: 255 return 0; 256 case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY: 257 return ide_floppy_get_format_capacities(drive, pc, argp); 258 case IDEFLOPPY_IOCTL_FORMAT_START: 259 if (!(mode & FMODE_WRITE)) 260 return -EPERM; 261 return ide_floppy_format_unit(drive, pc, (int __user *)argp); 262 case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS: 263 return ide_floppy_get_format_progress(drive, pc, argp); 264 default: 265 return -ENOTTY; 266 } 267} 268 269int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev, 270 fmode_t mode, unsigned int cmd, unsigned long arg) 271{ 272 struct ide_atapi_pc pc; 273 void __user *argp = (void __user *)arg; 274 int err; 275 276 if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) 277 return ide_floppy_lockdoor(drive, &pc, arg, cmd); 278 279 err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp); 280 if (err != -ENOTTY) 281 return err; 282 283 /* 284 * skip SCSI_IOCTL_SEND_COMMAND (deprecated) 285 * and CDROM_SEND_PACKET (legacy) ioctls 286 */ 287 if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND) 288 err = scsi_cmd_ioctl(bdev->bd_disk->queue, bdev->bd_disk, 289 mode, cmd, argp); 290 291 if (err == -ENOTTY) 292 err = generic_ide_ioctl(drive, bdev, cmd, arg); 293 294 return err; 295} 296