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![Tejun Heo](/assets/img/avatar_default.png)
check_events() implementations in both ide-gd and ide-cd are inadequate for in-kernel event polling. Both generate media change events continuously when certain conditions are met causing infinite event loop between the driver and userland event handler. As disk event now supports suppression of unlisted events, simply de-listing DISK_EVENT_MEDIA_CHANGE from disk->events resolves the problem. Internal handling around media revalidation will behave the same while userland will fall back to userland event polling after detecting the device doesn't support disk events. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Jens Axboe <jaxboe@fusionio.com> Acked-by: "David S. Miller" <davem@davemloft.net> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
478 lines
12 KiB
C
478 lines
12 KiB
C
/*
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* cdrom.c IOCTLs handling for ide-cd driver.
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*
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* Copyright (C) 1994-1996 Scott Snyder <snyder@fnald0.fnal.gov>
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* Copyright (C) 1996-1998 Erik Andersen <andersee@debian.org>
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* Copyright (C) 1998-2000 Jens Axboe <axboe@suse.de>
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*/
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#include <linux/kernel.h>
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#include <linux/cdrom.h>
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#include <linux/gfp.h>
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#include <linux/ide.h>
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#include <scsi/scsi.h>
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#include "ide-cd.h"
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/****************************************************************************
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* Other driver requests (open, close, check media change).
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*/
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int ide_cdrom_open_real(struct cdrom_device_info *cdi, int purpose)
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{
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return 0;
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}
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/*
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* Close down the device. Invalidate all cached blocks.
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*/
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void ide_cdrom_release_real(struct cdrom_device_info *cdi)
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{
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ide_drive_t *drive = cdi->handle;
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if (!cdi->use_count)
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drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
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}
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/*
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* add logic to try GET_EVENT command first to check for media and tray
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* status. this should be supported by newer cd-r/w and all DVD etc
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* drives
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*/
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int ide_cdrom_drive_status(struct cdrom_device_info *cdi, int slot_nr)
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{
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ide_drive_t *drive = cdi->handle;
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struct media_event_desc med;
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struct request_sense sense;
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int stat;
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if (slot_nr != CDSL_CURRENT)
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return -EINVAL;
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stat = cdrom_check_status(drive, &sense);
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if (!stat || sense.sense_key == UNIT_ATTENTION)
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return CDS_DISC_OK;
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if (!cdrom_get_media_event(cdi, &med)) {
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if (med.media_present)
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return CDS_DISC_OK;
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else if (med.door_open)
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return CDS_TRAY_OPEN;
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else
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return CDS_NO_DISC;
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}
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if (sense.sense_key == NOT_READY && sense.asc == 0x04
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&& sense.ascq == 0x04)
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return CDS_DISC_OK;
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/*
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* If not using Mt Fuji extended media tray reports,
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* just return TRAY_OPEN since ATAPI doesn't provide
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* any other way to detect this...
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*/
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if (sense.sense_key == NOT_READY) {
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if (sense.asc == 0x3a && sense.ascq == 1)
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return CDS_NO_DISC;
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else
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return CDS_TRAY_OPEN;
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}
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return CDS_DRIVE_NOT_READY;
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}
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/*
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* ide-cd always generates media changed event if media is missing, which
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* makes it impossible to use for proper event reporting, so disk->events
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* is cleared to 0 and the following function is used only to trigger
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* revalidation and never propagated to userland.
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*/
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unsigned int ide_cdrom_check_events_real(struct cdrom_device_info *cdi,
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unsigned int clearing, int slot_nr)
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{
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ide_drive_t *drive = cdi->handle;
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int retval;
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if (slot_nr == CDSL_CURRENT) {
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(void) cdrom_check_status(drive, NULL);
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retval = (drive->dev_flags & IDE_DFLAG_MEDIA_CHANGED) ? 1 : 0;
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drive->dev_flags &= ~IDE_DFLAG_MEDIA_CHANGED;
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return retval ? DISK_EVENT_MEDIA_CHANGE : 0;
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} else {
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return 0;
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}
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}
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/* Eject the disk if EJECTFLAG is 0.
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If EJECTFLAG is 1, try to reload the disk. */
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static
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int cdrom_eject(ide_drive_t *drive, int ejectflag,
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struct request_sense *sense)
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{
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struct cdrom_info *cd = drive->driver_data;
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struct cdrom_device_info *cdi = &cd->devinfo;
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char loej = 0x02;
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unsigned char cmd[BLK_MAX_CDB];
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if ((drive->atapi_flags & IDE_AFLAG_NO_EJECT) && !ejectflag)
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return -EDRIVE_CANT_DO_THIS;
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/* reload fails on some drives, if the tray is locked */
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if ((drive->atapi_flags & IDE_AFLAG_DOOR_LOCKED) && ejectflag)
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return 0;
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/* only tell drive to close tray if open, if it can do that */
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if (ejectflag && (cdi->mask & CDC_CLOSE_TRAY))
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loej = 0;
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memset(cmd, 0, BLK_MAX_CDB);
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cmd[0] = GPCMD_START_STOP_UNIT;
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cmd[4] = loej | (ejectflag != 0);
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return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, 0);
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}
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/* Lock the door if LOCKFLAG is nonzero; unlock it otherwise. */
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static
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int ide_cd_lockdoor(ide_drive_t *drive, int lockflag,
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struct request_sense *sense)
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{
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struct request_sense my_sense;
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int stat;
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if (sense == NULL)
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sense = &my_sense;
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/* If the drive cannot lock the door, just pretend. */
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if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0) {
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stat = 0;
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} else {
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unsigned char cmd[BLK_MAX_CDB];
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memset(cmd, 0, BLK_MAX_CDB);
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cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
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cmd[4] = lockflag ? 1 : 0;
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stat = ide_cd_queue_pc(drive, cmd, 0, NULL, NULL,
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sense, 0, 0);
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}
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/* If we got an illegal field error, the drive
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probably cannot lock the door. */
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if (stat != 0 &&
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sense->sense_key == ILLEGAL_REQUEST &&
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(sense->asc == 0x24 || sense->asc == 0x20)) {
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printk(KERN_ERR "%s: door locking not supported\n",
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drive->name);
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drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
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stat = 0;
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}
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/* no medium, that's alright. */
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if (stat != 0 && sense->sense_key == NOT_READY && sense->asc == 0x3a)
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stat = 0;
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if (stat == 0) {
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if (lockflag)
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drive->atapi_flags |= IDE_AFLAG_DOOR_LOCKED;
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else
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drive->atapi_flags &= ~IDE_AFLAG_DOOR_LOCKED;
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}
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return stat;
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}
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int ide_cdrom_tray_move(struct cdrom_device_info *cdi, int position)
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{
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ide_drive_t *drive = cdi->handle;
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struct request_sense sense;
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if (position) {
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int stat = ide_cd_lockdoor(drive, 0, &sense);
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if (stat)
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return stat;
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}
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return cdrom_eject(drive, !position, &sense);
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}
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int ide_cdrom_lock_door(struct cdrom_device_info *cdi, int lock)
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{
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ide_drive_t *drive = cdi->handle;
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return ide_cd_lockdoor(drive, lock, NULL);
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}
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/*
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* ATAPI devices are free to select the speed you request or any slower
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* rate. :-( Requesting too fast a speed will _not_ produce an error.
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*/
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int ide_cdrom_select_speed(struct cdrom_device_info *cdi, int speed)
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{
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ide_drive_t *drive = cdi->handle;
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struct cdrom_info *cd = drive->driver_data;
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struct request_sense sense;
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u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
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int stat;
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unsigned char cmd[BLK_MAX_CDB];
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if (speed == 0)
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speed = 0xffff; /* set to max */
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else
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speed *= 177; /* Nx to kbytes/s */
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memset(cmd, 0, BLK_MAX_CDB);
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cmd[0] = GPCMD_SET_SPEED;
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/* Read Drive speed in kbytes/second MSB/LSB */
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cmd[2] = (speed >> 8) & 0xff;
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cmd[3] = speed & 0xff;
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if ((cdi->mask & (CDC_CD_R | CDC_CD_RW | CDC_DVD_R)) !=
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(CDC_CD_R | CDC_CD_RW | CDC_DVD_R)) {
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/* Write Drive speed in kbytes/second MSB/LSB */
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cmd[4] = (speed >> 8) & 0xff;
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cmd[5] = speed & 0xff;
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}
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stat = ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, &sense, 0, 0);
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if (!ide_cdrom_get_capabilities(drive, buf)) {
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ide_cdrom_update_speed(drive, buf);
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cdi->speed = cd->current_speed;
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}
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return 0;
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}
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int ide_cdrom_get_last_session(struct cdrom_device_info *cdi,
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struct cdrom_multisession *ms_info)
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{
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struct atapi_toc *toc;
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ide_drive_t *drive = cdi->handle;
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struct cdrom_info *info = drive->driver_data;
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struct request_sense sense;
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int ret;
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if ((drive->atapi_flags & IDE_AFLAG_TOC_VALID) == 0 || !info->toc) {
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ret = ide_cd_read_toc(drive, &sense);
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if (ret)
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return ret;
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}
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toc = info->toc;
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ms_info->addr.lba = toc->last_session_lba;
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ms_info->xa_flag = toc->xa_flag;
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return 0;
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}
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int ide_cdrom_get_mcn(struct cdrom_device_info *cdi,
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struct cdrom_mcn *mcn_info)
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{
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ide_drive_t *drive = cdi->handle;
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int stat, mcnlen;
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char buf[24];
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unsigned char cmd[BLK_MAX_CDB];
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unsigned len = sizeof(buf);
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memset(cmd, 0, BLK_MAX_CDB);
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cmd[0] = GPCMD_READ_SUBCHANNEL;
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cmd[1] = 2; /* MSF addressing */
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cmd[2] = 0x40; /* request subQ data */
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cmd[3] = 2; /* format */
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cmd[8] = len;
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stat = ide_cd_queue_pc(drive, cmd, 0, buf, &len, NULL, 0, 0);
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if (stat)
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return stat;
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mcnlen = sizeof(mcn_info->medium_catalog_number) - 1;
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memcpy(mcn_info->medium_catalog_number, buf + 9, mcnlen);
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mcn_info->medium_catalog_number[mcnlen] = '\0';
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return 0;
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}
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int ide_cdrom_reset(struct cdrom_device_info *cdi)
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{
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ide_drive_t *drive = cdi->handle;
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struct cdrom_info *cd = drive->driver_data;
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struct request_sense sense;
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struct request *rq;
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int ret;
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rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
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rq->cmd_type = REQ_TYPE_SPECIAL;
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rq->cmd_flags = REQ_QUIET;
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ret = blk_execute_rq(drive->queue, cd->disk, rq, 0);
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blk_put_request(rq);
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/*
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* A reset will unlock the door. If it was previously locked,
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* lock it again.
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*/
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if (drive->atapi_flags & IDE_AFLAG_DOOR_LOCKED)
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(void)ide_cd_lockdoor(drive, 1, &sense);
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return ret;
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}
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static int ide_cd_get_toc_entry(ide_drive_t *drive, int track,
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struct atapi_toc_entry **ent)
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{
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struct cdrom_info *info = drive->driver_data;
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struct atapi_toc *toc = info->toc;
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int ntracks;
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/*
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* don't serve cached data, if the toc isn't valid
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*/
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if ((drive->atapi_flags & IDE_AFLAG_TOC_VALID) == 0)
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return -EINVAL;
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/* Check validity of requested track number. */
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ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
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if (toc->hdr.first_track == CDROM_LEADOUT)
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ntracks = 0;
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if (track == CDROM_LEADOUT)
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*ent = &toc->ent[ntracks];
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else if (track < toc->hdr.first_track || track > toc->hdr.last_track)
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return -EINVAL;
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else
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*ent = &toc->ent[track - toc->hdr.first_track];
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return 0;
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}
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static int ide_cd_fake_play_trkind(ide_drive_t *drive, void *arg)
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{
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struct cdrom_ti *ti = arg;
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struct atapi_toc_entry *first_toc, *last_toc;
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unsigned long lba_start, lba_end;
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int stat;
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struct request_sense sense;
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unsigned char cmd[BLK_MAX_CDB];
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stat = ide_cd_get_toc_entry(drive, ti->cdti_trk0, &first_toc);
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if (stat)
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return stat;
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stat = ide_cd_get_toc_entry(drive, ti->cdti_trk1, &last_toc);
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if (stat)
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return stat;
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if (ti->cdti_trk1 != CDROM_LEADOUT)
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++last_toc;
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lba_start = first_toc->addr.lba;
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lba_end = last_toc->addr.lba;
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if (lba_end <= lba_start)
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return -EINVAL;
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memset(cmd, 0, BLK_MAX_CDB);
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cmd[0] = GPCMD_PLAY_AUDIO_MSF;
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lba_to_msf(lba_start, &cmd[3], &cmd[4], &cmd[5]);
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lba_to_msf(lba_end - 1, &cmd[6], &cmd[7], &cmd[8]);
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return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, &sense, 0, 0);
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}
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static int ide_cd_read_tochdr(ide_drive_t *drive, void *arg)
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{
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struct cdrom_info *cd = drive->driver_data;
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struct cdrom_tochdr *tochdr = arg;
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struct atapi_toc *toc;
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int stat;
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/* Make sure our saved TOC is valid. */
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stat = ide_cd_read_toc(drive, NULL);
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if (stat)
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return stat;
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toc = cd->toc;
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tochdr->cdth_trk0 = toc->hdr.first_track;
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tochdr->cdth_trk1 = toc->hdr.last_track;
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return 0;
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}
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static int ide_cd_read_tocentry(ide_drive_t *drive, void *arg)
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{
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struct cdrom_tocentry *tocentry = arg;
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struct atapi_toc_entry *toce;
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int stat;
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stat = ide_cd_get_toc_entry(drive, tocentry->cdte_track, &toce);
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if (stat)
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return stat;
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tocentry->cdte_ctrl = toce->control;
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tocentry->cdte_adr = toce->adr;
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if (tocentry->cdte_format == CDROM_MSF) {
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lba_to_msf(toce->addr.lba,
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&tocentry->cdte_addr.msf.minute,
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&tocentry->cdte_addr.msf.second,
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&tocentry->cdte_addr.msf.frame);
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} else
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tocentry->cdte_addr.lba = toce->addr.lba;
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return 0;
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}
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int ide_cdrom_audio_ioctl(struct cdrom_device_info *cdi,
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unsigned int cmd, void *arg)
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{
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ide_drive_t *drive = cdi->handle;
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switch (cmd) {
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/*
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* emulate PLAY_AUDIO_TI command with PLAY_AUDIO_10, since
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* atapi doesn't support it
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*/
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case CDROMPLAYTRKIND:
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return ide_cd_fake_play_trkind(drive, arg);
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case CDROMREADTOCHDR:
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return ide_cd_read_tochdr(drive, arg);
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case CDROMREADTOCENTRY:
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return ide_cd_read_tocentry(drive, arg);
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default:
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return -EINVAL;
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}
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}
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/* the generic packet interface to cdrom.c */
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int ide_cdrom_packet(struct cdrom_device_info *cdi,
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struct packet_command *cgc)
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{
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ide_drive_t *drive = cdi->handle;
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unsigned int flags = 0;
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unsigned len = cgc->buflen;
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if (cgc->timeout <= 0)
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cgc->timeout = ATAPI_WAIT_PC;
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/* here we queue the commands from the uniform CD-ROM
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layer. the packet must be complete, as we do not
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touch it at all. */
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if (cgc->data_direction == CGC_DATA_WRITE)
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flags |= REQ_WRITE;
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if (cgc->sense)
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memset(cgc->sense, 0, sizeof(struct request_sense));
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if (cgc->quiet)
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flags |= REQ_QUIET;
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cgc->stat = ide_cd_queue_pc(drive, cgc->cmd,
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cgc->data_direction == CGC_DATA_WRITE,
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cgc->buffer, &len,
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cgc->sense, cgc->timeout, flags);
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if (!cgc->stat)
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cgc->buflen -= len;
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return cgc->stat;
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}
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