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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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289 lines
6.8 KiB
C
289 lines
6.8 KiB
C
/*
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* ide-floppy IOCTLs handling.
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*/
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#include <linux/kernel.h>
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#include <linux/ide.h>
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#include <linux/cdrom.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi_ioctl.h>
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#include "ide-floppy.h"
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/*
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* Obtain the list of formattable capacities.
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* Very similar to ide_floppy_get_capacity, except that we push the capacity
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* descriptors to userland, instead of our own structures.
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*
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* Userland gives us the following structure:
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*
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* struct idefloppy_format_capacities {
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* int nformats;
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* struct {
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* int nblocks;
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* int blocksize;
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* } formats[];
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* };
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*
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* userland initializes nformats to the number of allocated formats[] records.
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* On exit we set nformats to the number of records we've actually initialized.
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*/
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static int ide_floppy_get_format_capacities(ide_drive_t *drive, int __user *arg)
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{
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struct ide_disk_obj *floppy = drive->driver_data;
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struct ide_atapi_pc pc;
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u8 header_len, desc_cnt;
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int i, blocks, length, u_array_size, u_index;
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int __user *argp;
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if (get_user(u_array_size, arg))
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return -EFAULT;
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if (u_array_size <= 0)
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return -EINVAL;
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ide_floppy_create_read_capacity_cmd(&pc);
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if (ide_queue_pc_tail(drive, floppy->disk, &pc)) {
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printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
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return -EIO;
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}
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header_len = pc.buf[3];
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desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
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u_index = 0;
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argp = arg + 1;
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/*
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* We always skip the first capacity descriptor. That's the current
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* capacity. We are interested in the remaining descriptors, the
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* formattable capacities.
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*/
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for (i = 1; i < desc_cnt; i++) {
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unsigned int desc_start = 4 + i*8;
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if (u_index >= u_array_size)
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break; /* User-supplied buffer too small */
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blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
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length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
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if (put_user(blocks, argp))
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return -EFAULT;
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++argp;
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if (put_user(length, argp))
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return -EFAULT;
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++argp;
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++u_index;
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}
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if (put_user(u_index, arg))
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return -EFAULT;
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return 0;
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}
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static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc, int b,
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int l, int flags)
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{
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ide_init_pc(pc);
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pc->c[0] = GPCMD_FORMAT_UNIT;
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pc->c[1] = 0x17;
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memset(pc->buf, 0, 12);
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pc->buf[1] = 0xA2;
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/* Default format list header, u8 1: FOV/DCRT/IMM bits set */
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if (flags & 1) /* Verify bit on... */
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pc->buf[1] ^= 0x20; /* ... turn off DCRT bit */
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pc->buf[3] = 8;
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put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4]));
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put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8]));
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pc->buf_size = 12;
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pc->flags |= PC_FLAG_WRITING;
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}
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static int ide_floppy_get_sfrp_bit(ide_drive_t *drive)
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{
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struct ide_disk_obj *floppy = drive->driver_data;
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struct ide_atapi_pc pc;
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drive->atapi_flags &= ~IDE_AFLAG_SRFP;
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ide_floppy_create_mode_sense_cmd(&pc, IDEFLOPPY_CAPABILITIES_PAGE);
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pc.flags |= PC_FLAG_SUPPRESS_ERROR;
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if (ide_queue_pc_tail(drive, floppy->disk, &pc))
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return 1;
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if (pc.buf[8 + 2] & 0x40)
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drive->atapi_flags |= IDE_AFLAG_SRFP;
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return 0;
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}
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static int ide_floppy_format_unit(ide_drive_t *drive, int __user *arg)
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{
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struct ide_disk_obj *floppy = drive->driver_data;
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struct ide_atapi_pc pc;
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int blocks, length, flags, err = 0;
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if (floppy->openers > 1) {
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/* Don't format if someone is using the disk */
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drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
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return -EBUSY;
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}
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drive->dev_flags |= IDE_DFLAG_FORMAT_IN_PROGRESS;
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/*
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* Send ATAPI_FORMAT_UNIT to the drive.
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*
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* Userland gives us the following structure:
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*
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* struct idefloppy_format_command {
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* int nblocks;
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* int blocksize;
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* int flags;
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* } ;
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*
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* flags is a bitmask, currently, the only defined flag is:
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*
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* 0x01 - verify media after format.
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*/
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if (get_user(blocks, arg) ||
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get_user(length, arg+1) ||
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get_user(flags, arg+2)) {
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err = -EFAULT;
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goto out;
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}
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(void)ide_floppy_get_sfrp_bit(drive);
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ide_floppy_create_format_unit_cmd(&pc, blocks, length, flags);
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if (ide_queue_pc_tail(drive, floppy->disk, &pc))
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err = -EIO;
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out:
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if (err)
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drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS;
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return err;
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}
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/*
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* Get ATAPI_FORMAT_UNIT progress indication.
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*
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* Userland gives a pointer to an int. The int is set to a progress
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* indicator 0-65536, with 65536=100%.
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*
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* If the drive does not support format progress indication, we just check
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* the dsc bit, and return either 0 or 65536.
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*/
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static int ide_floppy_get_format_progress(ide_drive_t *drive, int __user *arg)
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{
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struct ide_disk_obj *floppy = drive->driver_data;
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struct ide_atapi_pc pc;
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int progress_indication = 0x10000;
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if (drive->atapi_flags & IDE_AFLAG_SRFP) {
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ide_create_request_sense_cmd(drive, &pc);
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if (ide_queue_pc_tail(drive, floppy->disk, &pc))
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return -EIO;
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if (floppy->sense_key == 2 &&
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floppy->asc == 4 &&
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floppy->ascq == 4)
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progress_indication = floppy->progress_indication;
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/* Else assume format_unit has finished, and we're at 0x10000 */
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} else {
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ide_hwif_t *hwif = drive->hwif;
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unsigned long flags;
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u8 stat;
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local_irq_save(flags);
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stat = hwif->tp_ops->read_status(hwif);
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local_irq_restore(flags);
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progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000;
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}
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if (put_user(progress_indication, arg))
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return -EFAULT;
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return 0;
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}
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static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
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unsigned long arg, unsigned int cmd)
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{
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struct ide_disk_obj *floppy = drive->driver_data;
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struct gendisk *disk = floppy->disk;
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int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
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if (floppy->openers > 1)
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return -EBUSY;
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ide_set_media_lock(drive, disk, prevent);
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if (cmd == CDROMEJECT)
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ide_do_start_stop(drive, disk, 2);
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return 0;
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}
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static int ide_floppy_format_ioctl(ide_drive_t *drive, fmode_t mode,
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unsigned int cmd, void __user *argp)
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{
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switch (cmd) {
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case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
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return 0;
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case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
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return ide_floppy_get_format_capacities(drive, argp);
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case IDEFLOPPY_IOCTL_FORMAT_START:
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if (!(mode & FMODE_WRITE))
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return -EPERM;
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return ide_floppy_format_unit(drive, (int __user *)argp);
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case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
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return ide_floppy_get_format_progress(drive, argp);
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default:
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return -ENOTTY;
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}
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}
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int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
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fmode_t mode, unsigned int cmd, unsigned long arg)
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{
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struct ide_atapi_pc pc;
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void __user *argp = (void __user *)arg;
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int err;
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if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR)
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return ide_floppy_lockdoor(drive, &pc, arg, cmd);
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err = ide_floppy_format_ioctl(drive, mode, cmd, argp);
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if (err != -ENOTTY)
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return err;
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/*
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* skip SCSI_IOCTL_SEND_COMMAND (deprecated)
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* and CDROM_SEND_PACKET (legacy) ioctls
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*/
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if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
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err = scsi_cmd_ioctl(bdev->bd_disk->queue, bdev->bd_disk,
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mode, cmd, argp);
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if (err == -ENOTTY)
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err = generic_ide_ioctl(drive, bdev, cmd, arg);
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return err;
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}
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