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Release 4.14 drivers/ide/ide-floppy_ioctl.c

Directory: drivers/ide
// SPDX-License-Identifier: GPL-2.0
/*
 * ide-floppy IOCTLs handling.
 */

#include <linux/kernel.h>
#include <linux/ide.h>
#include <linux/cdrom.h>
#include <linux/mutex.h>

#include <asm/unaligned.h>

#include <scsi/scsi_ioctl.h>

#include "ide-floppy.h"

/*
 * Obtain the list of formattable capacities.
 * Very similar to ide_floppy_get_capacity, except that we push the capacity
 * descriptors to userland, instead of our own structures.
 *
 * Userland gives us the following structure:
 *
 * struct idefloppy_format_capacities {
 *      int nformats;
 *      struct {
 *              int nblocks;
 *              int blocksize;
 *      } formats[];
 * };
 *
 * userland initializes nformats to the number of allocated formats[] records.
 * On exit we set nformats to the number of records we've actually initialized.
 */

static DEFINE_MUTEX(ide_floppy_ioctl_mutex);

static int ide_floppy_get_format_capacities(ide_drive_t *drive, struct ide_atapi_pc *pc, int __user *arg) { struct ide_disk_obj *floppy = drive->driver_data; int i, blocks, length, u_array_size, u_index; int __user *argp; u8 pc_buf[256], header_len, desc_cnt; if (get_user(u_array_size, arg)) return -EFAULT; if (u_array_size <= 0) return -EINVAL; ide_floppy_create_read_capacity_cmd(pc); if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) { printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n"); return -EIO; } header_len = pc_buf[3]; desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */ u_index = 0; argp = arg + 1; /* * We always skip the first capacity descriptor. That's the current * capacity. We are interested in the remaining descriptors, the * formattable capacities. */ for (i = 1; i < desc_cnt; i++) { unsigned int desc_start = 4 + i*8; if (u_index >= u_array_size) break; /* User-supplied buffer too small */ blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]); length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]); if (put_user(blocks, argp)) return -EFAULT; ++argp; if (put_user(length, argp)) return -EFAULT; ++argp; ++u_index; } if (put_user(u_index, arg)) return -EFAULT; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bartlomiej Zolnierkiewicz24194.51%350.00%
Borislav Petkov93.53%233.33%
Linus Torvalds51.96%116.67%
Total255100.00%6100.00%


static void ide_floppy_create_format_unit_cmd(struct ide_atapi_pc *pc, u8 *buf, int b, int l, int flags) { ide_init_pc(pc); pc->c[0] = GPCMD_FORMAT_UNIT; pc->c[1] = 0x17; memset(buf, 0, 12); buf[1] = 0xA2; /* Default format list header, u8 1: FOV/DCRT/IMM bits set */ if (flags & 1) /* Verify bit on... */ buf[1] ^= 0x20; /* ... turn off DCRT bit */ buf[3] = 8; put_unaligned(cpu_to_be32(b), (unsigned int *)(&buf[4])); put_unaligned(cpu_to_be32(l), (unsigned int *)(&buf[8])); pc->req_xfer = 12; pc->flags |= PC_FLAG_WRITING; }

Contributors

PersonTokensPropCommitsCommitProp
Bartlomiej Zolnierkiewicz13596.43%150.00%
Borislav Petkov53.57%150.00%
Total140100.00%2100.00%


static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc) { struct ide_disk_obj *floppy = drive->driver_data; u8 buf[20]; drive->atapi_flags &= ~IDE_AFLAG_SRFP; ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE); pc->flags |= PC_FLAG_SUPPRESS_ERROR; if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer)) return 1; if (buf[8 + 2] & 0x40) drive->atapi_flags |= IDE_AFLAG_SRFP; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bartlomiej Zolnierkiewicz7480.43%233.33%
Borislav Petkov1213.04%350.00%
Linus Torvalds66.52%116.67%
Total92100.00%6100.00%


static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc, int __user *arg) { struct ide_disk_obj *floppy = drive->driver_data; u8 buf[12]; int blocks, length, flags, err = 0; if (floppy->openers > 1) { /* Don't format if someone is using the disk */ drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS; return -EBUSY; } drive->dev_flags |= IDE_DFLAG_FORMAT_IN_PROGRESS; /* * Send ATAPI_FORMAT_UNIT to the drive. * * Userland gives us the following structure: * * struct idefloppy_format_command { * int nblocks; * int blocksize; * int flags; * } ; * * flags is a bitmask, currently, the only defined flag is: * * 0x01 - verify media after format. */ if (get_user(blocks, arg) || get_user(length, arg+1) || get_user(flags, arg+2)) { err = -EFAULT; goto out; } ide_floppy_get_sfrp_bit(drive, pc); ide_floppy_create_format_unit_cmd(pc, buf, blocks, length, flags); if (ide_queue_pc_tail(drive, floppy->disk, pc, buf, pc->req_xfer)) err = -EIO; out: if (err) drive->dev_flags &= ~IDE_DFLAG_FORMAT_IN_PROGRESS; return err; }

Contributors

PersonTokensPropCommitsCommitProp
Bartlomiej Zolnierkiewicz15187.79%342.86%
Borislav Petkov148.14%342.86%
Linus Torvalds74.07%114.29%
Total172100.00%7100.00%

/* * Get ATAPI_FORMAT_UNIT progress indication. * * Userland gives a pointer to an int. The int is set to a progress * indicator 0-65536, with 65536=100%. * * If the drive does not support format progress indication, we just check * the dsc bit, and return either 0 or 65536. */
static int ide_floppy_get_format_progress(ide_drive_t *drive, struct ide_atapi_pc *pc, int __user *arg) { struct ide_disk_obj *floppy = drive->driver_data; u8 sense_buf[18]; int progress_indication = 0x10000; if (drive->atapi_flags & IDE_AFLAG_SRFP) { ide_create_request_sense_cmd(drive, pc); if (ide_queue_pc_tail(drive, floppy->disk, pc, sense_buf, pc->req_xfer)) return -EIO; if (floppy->sense_key == 2 && floppy->asc == 4 && floppy->ascq == 4) progress_indication = floppy->progress_indication; /* Else assume format_unit has finished, and we're at 0x10000 */ } else { ide_hwif_t *hwif = drive->hwif; unsigned long flags; u8 stat; local_irq_save(flags); stat = hwif->tp_ops->read_status(hwif); local_irq_restore(flags); progress_indication = ((stat & ATA_DSC) == 0) ? 0 : 0x10000; } if (put_user(progress_indication, arg)) return -EFAULT; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bartlomiej Zolnierkiewicz16190.45%342.86%
Borislav Petkov126.74%342.86%
Linus Torvalds52.81%114.29%
Total178100.00%7100.00%


static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc, unsigned long arg, unsigned int cmd) { struct ide_disk_obj *floppy = drive->driver_data; struct gendisk *disk = floppy->disk; int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0; if (floppy->openers > 1) return -EBUSY; ide_set_media_lock(drive, disk, prevent); if (cmd == CDROMEJECT) ide_do_start_stop(drive, disk, 2); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bartlomiej Zolnierkiewicz95100.00%2100.00%
Total95100.00%2100.00%


static int ide_floppy_format_ioctl(ide_drive_t *drive, struct ide_atapi_pc *pc, fmode_t mode, unsigned int cmd, void __user *argp) { switch (cmd) { case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED: return 0; case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY: return ide_floppy_get_format_capacities(drive, pc, argp); case IDEFLOPPY_IOCTL_FORMAT_START: if (!(mode & FMODE_WRITE)) return -EPERM; return ide_floppy_format_unit(drive, pc, (int __user *)argp); case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS: return ide_floppy_get_format_progress(drive, pc, argp); default: return -ENOTTY; } }

Contributors

PersonTokensPropCommitsCommitProp
Bartlomiej Zolnierkiewicz8685.15%240.00%
Linus Torvalds1110.89%120.00%
Al Viro43.96%240.00%
Total101100.00%5100.00%


int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) { struct ide_atapi_pc pc; void __user *argp = (void __user *)arg; int err; mutex_lock(&ide_floppy_ioctl_mutex); if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR) { err = ide_floppy_lockdoor(drive, &pc, arg, cmd); goto out; } err = ide_floppy_format_ioctl(drive, &pc, mode, cmd, argp); if (err != -ENOTTY) goto out; /* * skip SCSI_IOCTL_SEND_COMMAND (deprecated) * and CDROM_SEND_PACKET (legacy) ioctls */ if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND) err = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp); if (err == -ENOTTY) err = generic_ide_ioctl(drive, bdev, cmd, arg); out: mutex_unlock(&ide_floppy_ioctl_mutex); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Bartlomiej Zolnierkiewicz12477.50%225.00%
Arnd Bergmann2515.62%225.00%
Al Viro74.38%225.00%
Linus Torvalds31.88%112.50%
Paolo Bonzini10.62%112.50%
Total160100.00%8100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Bartlomiej Zolnierkiewicz108888.89%735.00%
Borislav Petkov524.25%525.00%
Linus Torvalds373.02%15.00%
Arnd Bergmann342.78%210.00%
Al Viro110.90%315.00%
Greg Kroah-Hartman10.08%15.00%
Paolo Bonzini10.08%15.00%
Total1224100.00%20100.00%
Directory: drivers/ide
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