From: Edward Falk I've written two document files, and packaged them as a patch. Two things caught my eye while I was writing this up: The header comments for CDROMREADRAW, CDROMREADMODE1, and CDROMREADMODE2 disagree with the actual source code. The header comments imply that a cdrom_read structure is used to pass data, but the source code actually reads a cdrom_msf structure and then overwrites it with raw data. I'm not sure if there's a bug in the header comments, in the driver source, or I misread something. The CDROM_LOCKDOOR ioctl seems to lock/unlock all doors on all drives, because it uses a global variable. Signed-off-by: Andrew Morton --- 25-akpm/Documentation/ioctl/cdrom.txt | 935 +++++++++++++++++++++++++++++++++ 25-akpm/Documentation/ioctl/hdio.txt | 949 ++++++++++++++++++++++++++++++++++ 2 files changed, 1884 insertions(+) diff -puN /dev/null Documentation/ioctl/cdrom.txt --- /dev/null 2003-09-15 06:40:47.000000000 -0700 +++ 25-akpm/Documentation/ioctl/cdrom.txt 2004-11-28 00:45:09.693499136 -0800 @@ -0,0 +1,935 @@ + Summary of CDROM ioctl calls. + ============================ + + Edward A. Falk + + November, 2004 + +This document attempts to describe the ioctl(2) calls supported by +the CDROM layer. These are by-and-large implemented (as of Linux 2.6) +in drivers/cdrom/cdrom.c and drivers/block/scsi_ioctl.c + +ioctl values are listed in . As of this writing, they +are as follows: + + CDROMPAUSE Pause Audio Operation + CDROMRESUME Resume paused Audio Operation + CDROMPLAYMSF Play Audio MSF (struct cdrom_msf) + CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti) + CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr) + CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry) + CDROMSTOP Stop the cdrom drive + CDROMSTART Start the cdrom drive + CDROMEJECT Ejects the cdrom media + CDROMVOLCTRL Control output volume (struct cdrom_volctrl) + CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl) + CDROMREADMODE2 Read CDROM mode 2 data (2336 Bytes) + (struct cdrom_read) + CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes) + (struct cdrom_read) + CDROMREADAUDIO (struct cdrom_read_audio) + CDROMEJECT_SW enable(1)/disable(0) auto-ejecting + CDROMMULTISESSION Obtain the start-of-last-session + address of multi session disks + (struct cdrom_multisession) + CDROM_GET_MCN Obtain the "Universal Product Code" + if available (struct cdrom_mcn) + CDROM_GET_UPC CDROM_GET_MCN (deprecated) + CDROMRESET hard-reset the drive + CDROMVOLREAD Get the drive's volume setting + (struct cdrom_volctrl) + CDROMREADRAW read data in raw mode (2352 Bytes) + (struct cdrom_read) + CDROMREADCOOKED read data in cooked mode + CDROMSEEK seek msf address + CDROMPLAYBLK scsi-cd only, (struct cdrom_blk) + CDROMREADALL read all 2646 bytes + CDROMGETSPINDOWN + CDROMSETSPINDOWN + CDROMCLOSETRAY pendant of CDROMEJECT + CDROM_SET_OPTIONS Set behavior options + CDROM_CLEAR_OPTIONS Clear behavior options + CDROM_SELECT_SPEED Set the CD-ROM speed + CDROM_SELECT_DISC Select disc (for juke-boxes) + CDROM_MEDIA_CHANGED Check is media changed + CDROM_DRIVE_STATUS Get tray position, etc. + CDROM_DISC_STATUS Get disc type, etc. + CDROM_CHANGER_NSLOTS Get number of slots + CDROM_LOCKDOOR lock or unlock door + CDROM_DEBUG Turn debug messages on/off + CDROM_GET_CAPABILITY get capabilities + CDROMAUDIOBUFSIZ set the audio buffer size + DVD_READ_STRUCT Read structure + DVD_WRITE_STRUCT Write structure + DVD_AUTH Authentication + CDROM_SEND_PACKET send a packet to the drive + CDROM_NEXT_WRITABLE get next writable block + CDROM_LAST_WRITTEN get last block written on disc + + +The information that follows was determined from reading kernel source +code. It is likely that some corrections will be made over time. + + + + + + + +General: + + Unless otherwise specified, all ioctl calls return 0 on success + and -1 with errno set to an appropriate value on error. + + Unless otherwise specified, all ioctl calls return EFAULT on a + failed attempt to copy data to or from user address space. + + Individual drivers may return error codes not listed here. + + Unless otherwise specified, all data structures and constants + are defined in + + + + +CDROMPAUSE Pause Audio Operation + + usage: + + ioctl(fd, CDROMPAUSE, 0); + + inputs: none + + outputs: none + + error return: + ENOSYS cd drive not audio-capable. + + +CDROMRESUME Resume paused Audio Operation + + usage: + + ioctl(fd, CDROMRESUME, 0); + + inputs: none + + outputs: none + + error return: + ENOSYS cd drive not audio-capable. + + +CDROMPLAYMSF Play Audio MSF (struct cdrom_msf) + + usage: + + struct cdrom_msf msf; + ioctl(fd, CDROMPLAYMSF, &msf); + + inputs: + cdrom_msf structure, describing a segment of music to play + + outputs: none + + error return: + ENOSYS cd drive not audio-capable. + + notes: + Segment is described as start and end times, where each time + is described as minutes:seconds:frames. A frame is 1/75 of + a second. + + +CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti) + + usage: + + struct cdrom_ti ti; + ioctl(fd, CDROMPLAYTRKIND, &ti); + + inputs: + cdrom_ti structure, describing a segment of music to play + + outputs: none + + error return: + ENOSYS cd drive not audio-capable. + + notes: + Segment is described as start and end times, where each time + is described as a track and an index. + + + +CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr) + + usage: + + cdrom_tochdr header; + ioctl(fd, CDROMREADTOCHDR, &header); + + inputs: + cdrom_tochdr structure + + outputs: + cdrom_tochdr structure + + error return: + ENOSYS cd drive not audio-capable. + + + +CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry) + + usage: + + struct cdrom_tocentry entry; + ioctl(fd, CDROMREADTOCENTRY, &entry); + + inputs: + cdrom_tocentry structure + + outputs: + cdrom_tocentry structure + + error return: + ENOSYS cd drive not audio-capable. + EINVAL entry.cdte_format not CDROM_MSF or CDROM_LBA + + notes: + MSF stands for minutes-seconds-frames + LBA stands for logical block address + + + +CDROMSTOP Stop the cdrom drive + + usage: + + ioctl(fd, CDROMSTOP, 0); + + inputs: none + + outputs: none + + error return: + ENOSYS cd drive not audio-capable. + + +CDROMSTART Start the cdrom drive + + usage: + + ioctl(fd, CDROMSTART, 0); + + inputs: none + + outputs: none + + error return: + ENOSYS cd drive not audio-capable. + + +CDROMEJECT Ejects the cdrom media + + usage: + + ioctl(fd, CDROMEJECT, 0); + + inputs: none + + outputs: none + + error return: + ENOSYS cd drive not capable of ejecting + EBUSY other processes have drive open or door is locked + + + +CDROMCLOSETRAY pendant of CDROMEJECT + + usage: + + ioctl(fd, CDROMEJECT, 0); + + inputs: none + + outputs: none + + error return: + ENOSYS cd drive not capable of ejecting + EBUSY other processes have drive open or door is locked + + + +CDROMVOLCTRL Control output volume (struct cdrom_volctrl) + + usage: + + struct cdrom_volctrl volume; + ioctl(fd, CDROMVOLCTRL, &volume); + + inputs: + cdrom_volctrl structure containing volumes for up to 4 + channels. + + outputs: none + + error return: + ENOSYS cd drive not audio-capable. + + + +CDROMVOLREAD Get the drive's volume setting + (struct cdrom_volctrl) + + usage: + + struct cdrom_volctrl volume; + ioctl(fd, CDROMVOLREAD, &volume); + + inputs: none + + outputs: + The current volume settings. + + error return: + ENOSYS cd drive not audio-capable. + + + +CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl) + + usage: + + struct cdrom_subchnl q; + ioctl(fd, CDROMSUBCHNL, &q); + + inputs: + cdrom_subchnl structure + + outputs: + cdrom_subchnl structure + + error return: + ENOSYS cd drive not audio-capable. + EINVAL format not CDROM_MSF or CDROM_LBA + + notes: + Format is converted to CDROM_MSF on return + + + +CDROMREADRAW read data in raw mode (2352 Bytes) + (struct cdrom_read) + + usage: + + union { + struct cdrom_msf msf; /* input */ + char buffer[CD_FRAMESIZE_RAW]; /* return */ + } arg; + ioctl(fd, CDROMREADRAW, &arg); + + inputs: + cdrom_msf structure indicating an address to read. + Only the start values are significant. + + outputs: + Data written to address provided by user. + + error return: + EINVAL address less than 0, or msf less than 0:2:0 + ENOMEM out of memory + + notes: + As of 2.6.8.1, comments in indicate that this + ioctl accepts a cdrom_read structure, but actual source code + reads a cdrom_msf structure and writes a buffer of data to + the same address. + + MSF values are converted to LBA values via this formula: + + lba = (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET; + + + + +CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes) + (struct cdrom_read) + + notes: + Identical to CDROMREADRAW except that block size is + CD_FRAMESIZE (2048) bytes + + + +CDROMREADMODE2 Read CDROM mode 2 data (2336 Bytes) + (struct cdrom_read) + + notes: + Identical to CDROMREADRAW except that block size is + CD_FRAMESIZE_RAW0 (2336) bytes + + + +CDROMREADAUDIO (struct cdrom_read_audio) + + usage: + + struct cdrom_read_audio ra; + ioctl(fd, CDROMREADAUDIO, &ra); + + inputs: + cdrom_read_audio structure containing read start + point and length + + outputs: + audio data, returned to buffer indicated by ra + + error return: + EINVAL format not CDROM_MSF or CDROM_LBA + EINVAL nframes not in range [1 75] + ENXIO drive has no queue (probably means invalid fd) + ENOMEM out of memory + + +CDROMEJECT_SW enable(1)/disable(0) auto-ejecting + + usage: + + int val; + ioctl(fd, CDROMEJECT_SW, val); + + inputs: + Flag specifying auto-eject flag. + + outputs: none + + error return: + ENOSYS Drive is not capable of ejecting. + EBUSY Door is locked + + + + +CDROMMULTISESSION Obtain the start-of-last-session + address of multi session disks + (struct cdrom_multisession) + usage: + + struct cdrom_multisession ms_info; + ioctl(fd, CDROMMULTISESSION, &ms_info); + + inputs: + cdrom_multisession structure containing desired + format. + + outputs: + cdrom_multisession structure is filled with last_session + information. + + error return: + EINVAL format not CDROM_MSF or CDROM_LBA + + +CDROM_GET_MCN Obtain the "Universal Product Code" + if available (struct cdrom_mcn) + + usage: + + struct cdrom_mcn mcn; + ioctl(fd, CDROM_GET_MCN, &mcn); + + inputs: none + + outputs: + Universal Product Code + + error return: + ENOSYS Drive is not capable of reading MCN data. + + notes: + Source code comments state: + + The following function is implemented, although very few + audio discs give Universal Product Code information, which + should just be the Medium Catalog Number on the box. Note, + that the way the code is written on the CD is /not/ uniform + across all discs! + + + + +CDROM_GET_UPC CDROM_GET_MCN (deprecated) + + Not implemented, as of 2.6.8.1 + + + +CDROMRESET hard-reset the drive + + usage: + + ioctl(fd, CDROMRESET, 0); + + inputs: none + + outputs: none + + error return: + EACCES Access denied: requires CAP_SYS_ADMIN + ENOSYS Drive is not capable of resetting. + + + + +CDROMREADCOOKED read data in cooked mode + + usage: + + u8 buffer[CD_FRAMESIZE] + ioctl(fd, CDROMREADCOOKED, buffer); + + inputs: none + + outputs: + 2048 bytes of data, "cooked" mode. + + notes: + Not implemented on all drives. + + + + +CDROMREADALL read all 2646 bytes + + Same as CDROMREADCOOKED, but reads 2646 bytes. + + + +CDROMSEEK seek msf address + + usage: + + struct cdrom_msf msf; + ioctl(fd, CDROMSEEK, &msf); + + inputs: + MSF address to seek to. + + outputs: none + + + +CDROMPLAYBLK scsi-cd only, (struct cdrom_blk) + + usage: + + struct cdrom_blk blk; + ioctl(fd, CDROMPLAYBLK, &blk); + + inputs: + Region to play + + outputs: none + + + +CDROMGETSPINDOWN + + usage: + + char spindown; + ioctl(fd, CDROMGETSPINDOWN, &spindown); + + inputs: none + + outputs: + The value of the current 4-bit spindown value. + + + + +CDROMSETSPINDOWN + + usage: + + char spindown + ioctl(fd, CDROMSETSPINDOWN, &spindown); + + inputs: + 4-bit value used to control spindown (TODO: more detail here) + + outputs: none + + + + + +CDROM_SET_OPTIONS Set behavior options + + usage: + + int options; + ioctl(fd, CDROM_SET_OPTIONS, options); + + inputs: + New values for drive options. The logical 'or' of: + CDO_AUTO_CLOSE close tray on first open + CDO_AUTO_EJECT open tray on last release + CDO_USE_FFLAGS use O_NONBLOCK information on open + CDO_LOCK lock tray on open files + CDO_CHECK_TYPE check type on open for data + + outputs: + Returns the resulting options settings in the + ioctl return value. Returns -1 on error. + + error return: + ENOSYS selected option(s) not supported by drive. + + + + +CDROM_CLEAR_OPTIONS Clear behavior options + + Same as CDROM_SET_OPTIONS, except that selected options are + turned off. + + + +CDROM_SELECT_SPEED Set the CD-ROM speed + + usage: + + int speed; + ioctl(fd, CDROM_SELECT_SPEED, speed); + + inputs: + New drive speed. + + outputs: none + + error return: + ENOSYS speed selection not supported by drive. + + + +CDROM_SELECT_DISC Select disc (for juke-boxes) + + usage: + + int disk; + ioctl(fd, CDROM_SELECT_DISC, disk); + + inputs: + Disk to load into drive. + + outputs: none + + error return: + EINVAL Disk number beyond capacity of drive + + + +CDROM_MEDIA_CHANGED Check is media changed + + usage: + + int slot; + ioctl(fd, CDROM_MEDIA_CHANGED, slot); + + inputs: + Slot number to be tested, always zero except for jukeboxes. + May also be special values CDSL_NONE or CDSL_CURRENT + + outputs: + Ioctl return value is 0 or 1 depending on whether the media + has been changed, or -1 on error. + + error returns: + ENOSYS Drive can't detect media change + EINVAL Slot number beyond capacity of drive + ENOMEM Out of memory + + + +CDROM_DRIVE_STATUS Get tray position, etc. + + usage: + + int slot; + ioctl(fd, CDROM_DRIVE_STATUS, slot); + + inputs: + Slot number to be tested, always zero except for jukeboxes. + May also be special values CDSL_NONE or CDSL_CURRENT + + outputs: + Ioctl return value will be one of the following values + from : + + CDS_NO_INFO Information not available. + CDS_NO_DISC + CDS_TRAY_OPEN + CDS_DRIVE_NOT_READY + CDS_DISC_OK + -1 error + + error returns: + ENOSYS Drive can't detect drive status + EINVAL Slot number beyond capacity of drive + ENOMEM Out of memory + + + + +CDROM_DISC_STATUS Get disc type, etc. + + usage: + + ioctl(fd, CDROM_DISC_STATUS, 0); + + inputs: none + + outputs: + Ioctl return value will be one of the following values + from : + CDS_NO_INFO + CDS_AUDIO + CDS_MIXED + CDS_XA_2_2 + CDS_XA_2_1 + CDS_DATA_1 + + error returns: none at present + + notes: + Source code comments state: + + Ok, this is where problems start. The current interface for + the CDROM_DISC_STATUS ioctl is flawed. It makes the false + assumption that CDs are all CDS_DATA_1 or all CDS_AUDIO, etc. + Unfortunatly, while this is often the case, it is also + very common for CDs to have some tracks with data, and some + tracks with audio. Just because I feel like it, I declare + the following to be the best way to cope. If the CD has + ANY data tracks on it, it will be returned as a data CD. + If it has any XA tracks, I will return it as that. Now I + could simplify this interface by combining these returns with + the above, but this more clearly demonstrates the problem + with the current interface. Too bad this wasn't designed + to use bitmasks... -Erik + + Well, now we have the option CDS_MIXED: a mixed-type CD. + User level programmers might feel the ioctl is not very + useful. + ---david + + + + +CDROM_CHANGER_NSLOTS Get number of slots + + usage: + + ioctl(fd, CDROM_CHANGER_NSLOTS, 0); + + inputs: none + + outputs: + The ioctl return value will be the number of slots in a + CD changer. Typically 1 for non-multi-disk devices. + + error returns: none + + + +CDROM_LOCKDOOR lock or unlock door + + usage: + + int lock; + ioctl(fd, CDROM_LOCKDOOR, lock); + + inputs: + Door lock flag, 1=lock, 0=unlock + + outputs: none + + error returns: + EDRIVE_CANT_DO_THIS Door lock function not supported. + EBUSY Attempt to unlock when multiple users + have the drive open and not CAP_SYS_ADMIN + + notes: + As of 2.6.8.1, the lock flag is a global lock, meaning that + all CD drives will be locked or unlocked together. This is + probably a bug. + + The EDRIVE_CANT_DO_THIS value is defined in + and is currently (2.6.8.1) the same as EOPNOTSUPP + + + +CDROM_DEBUG Turn debug messages on/off + + usage: + + int debug; + ioctl(fd, CDROM_DEBUG, debug); + + inputs: + Cdrom debug flag, 0=disable, 1=enable + + outputs: + The ioctl return value will be the new debug flag. + + error return: + EACCES Access denied: requires CAP_SYS_ADMIN + + + +CDROM_GET_CAPABILITY get capabilities + + usage: + + ioctl(fd, CDROM_GET_CAPABILITY, 0); + + inputs: none + + outputs: + The ioctl return value is the current device capability + flags. See CDC_CLOSE_TRAY, CDC_OPEN_TRAY, etc. + + + +CDROMAUDIOBUFSIZ set the audio buffer size + + usage: + + int arg; + ioctl(fd, CDROMAUDIOBUFSIZ, val); + + inputs: + New audio buffer size + + outputs: + The ioctl return value is the new audio buffer size, or -1 + on error. + + error return: + ENOSYS Not supported by this driver. + + notes: + Not supported by all drivers. + + + +DVD_READ_STRUCT Read structure + + usage: + + dvd_struct s; + ioctl(fd, DVD_READ_STRUCT, &s); + + inputs: + dvd_struct structure, containing: + type specifies the information desired, one of + DVD_STRUCT_PHYSICAL, DVD_STRUCT_COPYRIGHT, + DVD_STRUCT_DISCKEY, DVD_STRUCT_BCA, + DVD_STRUCT_MANUFACT + physical.layer_num desired layer, indexed from 0 + copyright.layer_num desired layer, indexed from 0 + disckey.agid + + outputs: + dvd_struct structure, containing: + physical for type == DVD_STRUCT_PHYSICAL + copyright for type == DVD_STRUCT_COPYRIGHT + disckey.value for type == DVD_STRUCT_DISCKEY + bca.{len,value} for type == DVD_STRUCT_BCA + manufact.{len,valu} for type == DVD_STRUCT_MANUFACT + + error returns: + EINVAL physical.layer_num exceeds number of layers + EIO Recieved invalid response from drive + + + +DVD_WRITE_STRUCT Write structure + + Not implemented, as of 2.6.8.1 + + + +DVD_AUTH Authentication + + usage: + + dvd_authinfo ai; + ioctl(fd, DVD_AUTH, &ai); + + inputs: + dvd_authinfo structure. See + + outputs: + dvd_authinfo structure. + + error return: + ENOTTY ai.type not recognized. + + + +CDROM_SEND_PACKET send a packet to the drive + + usage: + + struct cdrom_generic_command cgc; + ioctl(fd, CDROM_SEND_PACKET, &cgc); + + inputs: + cdrom_generic_command structure containing the packet to send. + + outputs: none + cdrom_generic_command structure containing results. + + error return: + EIO command failed. + EPERM Operation not permitted, either because a + write command was attempted on a drive which + is opened read-only, or because the command + requires CAP_SYS_RAWIO + EINVAL cgc.data_direction not set + + + +CDROM_NEXT_WRITABLE get next writable block + + usage: + + long next; + ioctl(fd, CDROM_NEXT_WRITABLE, &next); + + inputs: none + + outputs: + The next writable block. + + + +CDROM_LAST_WRITTEN get last block written on disc + + usage: + + long last; + ioctl(fd, CDROM_NEXT_WRITABLE, &last); + + inputs: none + + outputs: + The last block written on disc + + diff -puN /dev/null Documentation/ioctl/hdio.txt --- /dev/null 2003-09-15 06:40:47.000000000 -0700 +++ 25-akpm/Documentation/ioctl/hdio.txt 2004-11-28 00:45:09.696498680 -0800 @@ -0,0 +1,949 @@ + Summary of HDIO_ ioctl calls. + ============================ + + Edward A. Falk + + November, 2004 + +This document attempts to describe the ioctl(2) calls supported by +the HD/IDE layer. These are by-and-large implemented (as of Linux 2.6) +in drivers/ide/ide.c and drivers/block/scsi_ioctl.c + +ioctl values are listed in . As of this writing, they +are as follows: + + ioctls that pass argument pointers to user space: + + HDIO_GETGEO get device geometry + HDIO_GET_UNMASKINTR get current unmask setting + HDIO_GET_MULTCOUNT get current IDE blockmode setting + HDIO_GET_QDMA get use-qdma flag + HDIO_SET_XFER set transfer rate via proc + HDIO_OBSOLETE_IDENTITY OBSOLETE, DO NOT USE + HDIO_GET_KEEPSETTINGS get keep-settings-on-reset flag + HDIO_GET_32BIT get current io_32bit setting + HDIO_GET_NOWERR get ignore-write-error flag + HDIO_GET_DMA get use-dma flag + HDIO_GET_NICE get nice flags + HDIO_GET_IDENTITY get IDE identification info + HDIO_GET_WCACHE get write cache mode on|off + HDIO_GET_ACOUSTIC get acoustic value + HDIO_GET_ADDRESS + HDIO_GET_BUSSTATE get the bus state of the hwif + HDIO_TRISTATE_HWIF execute a channel tristate + HDIO_DRIVE_RESET execute a device reset + HDIO_DRIVE_TASKFILE execute raw taskfile + HDIO_DRIVE_TASK execute task and special drive command + HDIO_DRIVE_CMD execute a special drive command + HDIO_DRIVE_CMD_AEB HDIO_DRIVE_TASK + + ioctls that pass non-pointer values: + + HDIO_SET_MULTCOUNT change IDE blockmode + HDIO_SET_UNMASKINTR permit other irqs during I/O + HDIO_SET_KEEPSETTINGS keep ioctl settings on reset + HDIO_SET_32BIT change io_32bit flags + HDIO_SET_NOWERR change ignore-write-error flag + HDIO_SET_DMA change use-dma flag + HDIO_SET_PIO_MODE reconfig interface to new speed + HDIO_SCAN_HWIF register and (re)scan interface + HDIO_SET_NICE set nice flags + HDIO_UNREGISTER_HWIF unregister interface + HDIO_SET_WCACHE change write cache enable-disable + HDIO_SET_ACOUSTIC change acoustic behavior + HDIO_SET_BUSSTATE set the bus state of the hwif + HDIO_SET_QDMA change use-qdma flag + HDIO_SET_ADDRESS change lba addressing modes + + HDIO_SET_IDE_SCSI + HDIO_SET_SCSI_IDE + + +The information that follows was determined from reading kernel source +code. It is likely that some corrections will be made over time. + + + + + + + +General: + + Unless otherwise specified, all ioctl calls return 0 on success + and -1 with errno set to an appropriate value on error. + + Unless otherwise specified, all ioctl calls return EFAULT on a + failed attempt to copy data to or from user address space. + + Unless otherwise specified, all data structures and constants + are defined in + + + +HDIO_GETGEO get device geometry + + usage: + + struct hd_geometry geom; + ioctl(fd, HDIO_GETGEO, &geom); + + + inputs: none + + outputs: + + hd_geometry structure containing: + + heads number of heads + sectors number of sectors/track + cylinders number of cylinders, mod 65536 + start starting sector of this partition. + + + error returns: + EINVAL if the device is not a disk drive or floppy drive, + or if the user passes a null pointer + + + notes: + + Not particularly useful with modern disk drives, whose geometry + is a polite fiction anyway. Modern drives are addressed + purely by sector number nowadays (lba addressing), and the + drive geometry is an abstraction which is actually subject + to change. Currently (as of Nov 2004), the geometry values + are the "bios" values -- presumably the values the drive had + when Linux first booted. + + In addition, the cylinders field of the hd_geometry is an + unsigned short, meaning that on most architectures, this + ioctl will not return a meaningful value on drives with more + than 65535 tracks. + + The start field is unsigned long, meaning that it will not + contain a meaningful value for disks over 219 Gb in size. + + + + +HDIO_GET_UNMASKINTR get current unmask setting + + usage: + + long val; + ioctl(fd, HDIO_GET_UNMASKINTR, &val); + + inputs: none + + outputs: + The value of the drive's current unmask setting + + + +HDIO_SET_UNMASKINTR permit other irqs during I/O + + usage: + + long val; + ioctl(fd, HDIO_SET_UNMASKINTR, val); + + inputs: + New value for unmask flag + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range [0 1] + EBUSY Controller busy + + + + +HDIO_GET_MULTCOUNT get current IDE blockmode setting + + usage: + + long val; + ioctl(fd, HDIO_GET_MULTCOUNT, &val); + + inputs: none + + outputs: + The value of the current IDE block mode setting. This + controls how many sectors the drive will transfer per + interrupt. + + + +HDIO_SET_MULTCOUNT change IDE blockmode + + usage: + + int val; + ioctl(fd, HDIO_SET_MULTCOUNT, val); + + inputs: + New value for IDE block mode setting. This controls how many + sectors the drive will transfer per interrupt. + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range supported by disk. + EBUSY Controller busy or blockmode already set. + EIO Drive did not accept new block mode. + + notes: + + Source code comments read: + + This is tightly woven into the driver->do_special can not + touch. DON'T do it again until a total personality rewrite + is committed." + + If blockmode has already been set, this ioctl will fail with + EBUSY + + + +HDIO_GET_QDMA get use-qdma flag + + Not implemented, as of 2.6.8.1 + + + +HDIO_SET_XFER set transfer rate via proc + + Not implemented, as of 2.6.8.1 + + + +HDIO_OBSOLETE_IDENTITY OBSOLETE, DO NOT USE + + Same as HDIO_GET_IDENTITY (see below), except that it only + returns the first 142 bytes of drive identity information. + + + +HDIO_GET_IDENTITY get IDE identification info + + usage: + + unsigned char identity[512]; + ioctl(fd, HDIO_GET_IDENTITY, identity); + + inputs: none + + outputs: + + ATA drive identity information. For full description, see + the IDENTIFY DEVICE and IDENTIFY PACKET DEVICE commands in + the ATA specification. + + error returns: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + ENOMSG IDENTIFY DEVICE information not available + + notes: + + Returns information that was obtained when the drive was + probed. Some of this information is subject to change, and + this ioctl does not re-probe the drive to update the + information. + + This information is also available from /proc/ide/hdX/identify + + + +HDIO_GET_KEEPSETTINGS get keep-settings-on-reset flag + + usage: + + long val; + ioctl(fd, HDIO_GET_KEEPSETTINGS, &val); + + inputs: none + + outputs: + The value of the current "keep settings" flag + + notes: + + When set, indicates that kernel should restore settings + after a drive reset. + + + +HDIO_SET_KEEPSETTINGS keep ioctl settings on reset + + usage: + + long val; + ioctl(fd, HDIO_SET_KEEPSETTINGS, val); + + inputs: + New value for keep_settings flag + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range [0 1] + EBUSY Controller busy + + + +HDIO_GET_32BIT get current io_32bit setting + + usage: + + long val; + ioctl(fd, HDIO_GET_32BIT, &val); + + inputs: none + + outputs: + The value of the current io_32bit setting + + notes: + + 0=16-bit, 1=32-bit, 2,3 = 32bit+sync + + + +HDIO_GET_NOWERR get ignore-write-error flag + + usage: + + long val; + ioctl(fd, HDIO_GET_NOWERR, &val); + + inputs: none + + outputs: + The value of the current ignore-write-error flag + + + +HDIO_GET_DMA get use-dma flag + + usage: + + long val; + ioctl(fd, HDIO_GET_DMA, &val); + + inputs: none + + outputs: + The value of the current use-dma flag + + + +HDIO_GET_NICE get nice flags + + usage: + + long nice; + ioctl(fd, HDIO_GET_NICE, &nice); + + inputs: none + + outputs: + + The drive's "nice" values. + + notes: + + Per-drive flags which determine when the system will give more + bandwidth to other devices sharing the same IDE bus. + See , near symbol IDE_NICE_DSC_OVERLAP. + + + + +HDIO_SET_NICE set nice flags + + usage: + + int nice; + ... + ioctl(fd, HDIO_SET_NICE, nice); + + inputs: + args[0] io address to probe + args[1] control address to probe + args[2] irq number + + outputs: none + + error returns: + EACCES Access denied: requires CAP_SYS_ADMIN + EPERM Flags other than DSC_OVERLAP and NICE_1 set. + EPERM DSC_OVERLAP specified but not supported by drive + + notes: + + This ioctl sets the DSC_OVERLAP and NICE_1 flags from values + provided by the user. + + + + + +HDIO_GET_WCACHE get write cache mode on|off + + usage: + + long val; + ioctl(fd, HDIO_GET_WCACHE, &val); + + inputs: none + + outputs: + The value of the current write cache mode + + + +HDIO_GET_ACOUSTIC get acoustic value + + usage: + + long val; + ioctl(fd, HDIO_GET_ACOUSTIC, &val); + + inputs: none + + outputs: + The value of the current acoustic settings + + notes: + + See HDIO_SET_ACOUSTIC + + + +HDIO_GET_ADDRESS + + usage: + + long val; + ioctl(fd, HDIO_GET_ADDRESS, &val); + + inputs: none + + outputs: + The value of the current addressing mode: + 0 = 28-bit + 1 = 48-bit + 2 = 48-bit doing 28-bit + 3 = 64-bit + + + +HDIO_GET_BUSSTATE get the bus state of the hwif + + usage: + + long state; + ioctl(fd, HDIO_SCAN_HWIF, &state); + + inputs: none + + outputs: + Current power state of the IDE bus. One of BUSSTATE_OFF, + BUSSTATE_ON, or BUSSTATE_TRISTATE + + error returns: + EACCES Access denied: requires CAP_SYS_ADMIN + + + + +HDIO_SET_BUSSTATE set the bus state of the hwif + + usage: + + int state; + ... + ioctl(fd, HDIO_SCAN_HWIF, state); + + inputs: + Desired IDE power state. One of BUSSTATE_OFF, BUSSTATE_ON, + or BUSSTATE_TRISTATE + + outputs: none + + error returns: + EACCES Access denied: requires CAP_SYS_RAWIO + EOPNOTSUPP Hardware interface does not support bus power control + + + + +HDIO_TRISTATE_HWIF execute a channel tristate + + Not implemented, as of 2.6.8.1. See HDIO_SET_BUSSTATE + + + +HDIO_DRIVE_RESET execute a device reset + + usage: + + int args[3] + ... + ioctl(fd, HDIO_DRIVE_RESET, args); + + inputs: none + + outputs: none + + error returns: + EACCES Access denied: requires CAP_SYS_ADMIN + + notes: + + Aborts any current command, prevent anything else from being + queued, execute a reset on the device, and issue BLKRRPART + ioctl on the block device. + + Executes an ATAPI soft reset if applicable, otherwise + executes an ATA soft reset on the controller. + + + +HDIO_DRIVE_TASKFILE execute raw taskfile + + Note: If you don't have a copy of the ANSI ATA specification + handy, you should probably ignore this ioctl. + + usage: + + struct { + ide_task_request_t req_task; + u8 outbuf[OUTPUT_SIZE]; + u8 inbuf[INPUT_SIZE]; + } task; + memset(&task.req_task, 0, sizeof(task.req_task)); + task.req_task.out_size = sizeof(task.outbuf); + task.req_task.in_size = sizeof(task.inbuf); + ... + ioctl(fd, HDIO_DRIVE_TASKFILE, &task); + ... + + inputs: + + (See below for details on memory area passed to ioctl.) + + io_ports[] values to be written to taskfile registers + hob_ports[] values to be written to taskfile registers + out_flags flags indicating which registers are valid + in_flags flags indicating which registers should be returned + data_phase see below + req_cmd command type to be executed + out_size size of output buffer + outbuf buffer of data to be transmitted to disk + inbuf buffer of data to be received from disk + + outputs: + + io_ports[] values returned in the taskfile registers + hob_ports[] values returned in the taskfile registers + out_flags flags indicating which registers are valid + in_flags flags indicating which registers should be returned + outbuf buffer of data to be transmitted to disk + inbuf buffer of data to be received from disk + + error returns: + EACCES CAP_SYS_ADMIN or CAP_SYS_RAWIO privelege not set. + ENOMSG Device is not a disk drive. + ENOMEM Unable to allocate memory for task + EFAULT req_cmd == TASKFILE_IN_OUT (not implemented as of 2.6.8) + EPERM req_cmd == TASKFILE_MULTI_OUT and drive + multi-count not yet set. + + + notes: + + Execute an ATA disk command directly by writing the "taskfile" + registers of the drive. Requires ADMIN and RAWIO access + privileges. + + Extreme caution should be used with using this ioctl. A + mistake can easily corrupt data or hang the system. + + The argument to the ioctl is a pointer to a region of memory + containing a ide_task_request_t structure, followed by an + optional buffer of data to be transmitted to the drive, + followed by an optional buffer to receive data from the drive. + + Command is passed to the disk drive via the ide_task_request_t + structure, which contains these fields: + + io_ports[8] values for the taskfile registers + hob_ports[8] high-order bytes, for extended commands + out_flags flags indicating which entries in the + io_ports[] and hob_ports[] arrays + contain valid values. + in_flags flags indicating which entries in the + io_ports[] and hob_ports[] arrays + are expected to contain valid values + on return. + data_phase See below + req_cmd Command type, see below + out_size output (user->drive) buffer size, bytes + in_size input (drive->user) buffer size, bytes + + Unused fields of io_ports[] and hob_ports[] should be set to + zero. + + The data_phase field describes the data transfer to be + performed. Value is one of: + + TASKFILE_IN + TASKFILE_MULTI_IN + TASKFILE_OUT + TASKFILE_MULTI_OUT + TASKFILE_IN_OUT + TASKFILE_IN_DMA + TASKFILE_IN_DMAQ + TASKFILE_OUT_DMA + TASKFILE_OUT_DMAQ + TASKFILE_P_IN + TASKFILE_P_IN_DMA + TASKFILE_P_IN_DMAQ + TASKFILE_P_OUT + TASKFILE_P_OUT_DMA + TASKFILE_P_OUT_DMAQ + + The req_cmd field classifies the command type. It may be + one of: + + IDE_DRIVE_TASK_NO_DATA + IDE_DRIVE_TASK_SET_XFER + IDE_DRIVE_TASK_IN + IDE_DRIVE_TASK_OUT + IDE_DRIVE_TASK_RAW_WRITE + + Currently (2.6.8), both the input and output buffers are + copied from the user and written back to the user, even when + not used. + + + + + + +HDIO_DRIVE_CMD execute a special drive command + + Note: If you don't have a copy of the ANSI ATA specification + handy, you should probably ignore this ioctl. + + usage: + + u8 args[4+XFER_SIZE]; + ... + ioctl(fd, HDIO_DRIVE_CMD, args); + + inputs: + + Taskfile register values: + args[0] COMMAND + args[1] SECTOR + args[2] FEATURE + args[3] NSECTOR + + outputs: + + args[] buffer is filled with register values followed by any + data returned by the disk. + args[0] status + args[1] error + args[2] NSECTOR + + error returns: + EACCES Access denied: requires CAP_SYS_RAWIO + ENOMEM Unable to allocate memory for task + + + + +HDIO_DRIVE_TASK execute task and special drive command + + Note: If you don't have a copy of the ANSI ATA specification + handy, you should probably ignore this ioctl. + + usage: + + u8 args[7]; + ... + ioctl(fd, HDIO_DRIVE_TASK, args); + + inputs: + + Taskfile register values: + args[0] COMMAND + args[1] FEATURE + args[2] NSECTOR + args[3] SECTOR + args[4] LCYL + args[5] HCYL + args[6] SELECT + + outputs: + + Taskfile register values: + args[0] status + args[1] error + args[2] NSECTOR + args[3] SECTOR + args[4] LCYL + args[5] HCYL + args[6] SELECT + + error returns: + EACCES Access denied: requires CAP_SYS_RAWIO + ENOMEM Unable to allocate memory for task + + + + +HDIO_DRIVE_CMD_AEB HDIO_DRIVE_TASK + + Not implemented, as of 2.6.8.1 + + + +HDIO_SET_32BIT change io_32bit flags + + usage: + + int val; + ioctl(fd, HDIO_SET_32BIT, val); + + inputs: + New value for io_32bit flag + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range [0 3] + EBUSY Controller busy + + + + +HDIO_SET_NOWERR change ignore-write-error flag + + usage: + + int val; + ioctl(fd, HDIO_SET_NOWERR, val); + + inputs: + New value for ignore-write-error flag. Used for ignoring + WRERR_STAT + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range [0 1] + EBUSY Controller busy + + + +HDIO_SET_DMA change use-dma flag + + usage: + + long val; + ioctl(fd, HDIO_SET_DMA, val); + + inputs: + New value for use-dma flag + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range [0 1] + EBUSY Controller busy + + + +HDIO_SET_PIO_MODE reconfig interface to new speed + + usage: + + long val; + ioctl(fd, HDIO_SET_PIO_MODE, val); + + inputs: + New interface speed. + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range [0 255] + EBUSY Controller busy + + + +HDIO_SCAN_HWIF register and (re)scan interface + + usage: + + int args[3] + ... + ioctl(fd, HDIO_SCAN_HWIF, args); + + inputs: + args[0] io address to probe + args[1] control address to probe + args[2] irq number + + outputs: none + + error returns: + EACCES Access denied: requires CAP_SYS_RAWIO + EIO Probe failed. + + notes: + + This ioctl initializes the addresses and irq for a disk + controller, probes for drives, and creates /proc/ide + interfaces as appropiate. + + + +HDIO_UNREGISTER_HWIF unregister interface + + usage: + + int index; + ioctl(fd, HDIO_UNREGISTER_HWIF, index); + + inputs: + index index of hardware interface to unregister + + outputs: none + + error returns: + EACCES Access denied: requires CAP_SYS_RAWIO + + notes: + + This ioctl removes a hardware interface from the kernel. + + Currently (2.6.8) this ioctl silently fails if any drive on + the interface is busy. + + + +HDIO_SET_WCACHE change write cache enable-disable + + usage: + + int val; + ioctl(fd, HDIO_SET_WCACHE, val); + + inputs: + New value for write cache enable + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range [0 1] + EBUSY Controller busy + + + +HDIO_SET_ACOUSTIC change acoustic behavior + + usage: + + int val; + ioctl(fd, HDIO_SET_ACOUSTIC, val); + + inputs: + New value for drive acoustic settings + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range [0 254] + EBUSY Controller busy + + + +HDIO_SET_QDMA change use-qdma flag + + Not implemented, as of 2.6.8.1 + + + +HDIO_SET_ADDRESS change lba addressing modes + + usage: + + int val; + ioctl(fd, HDIO_SET_ADDRESS, val); + + inputs: + New value for addressing mode + 0 = 28-bit + 1 = 48-bit + 2 = 48-bit doing 28-bit + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range [0 2] + EBUSY Controller busy + EIO Drive does not support lba48 mode. + + +HDIO_SET_IDE_SCSI + + usage: + + long val; + ioctl(fd, HDIO_SET_IDE_SCSI, val); + + inputs: + New value for scsi emulation mode (?) + + outputs: none + + error return: + EINVAL (bdev != bdev->bd_contains) (not sure what this means) + EACCES Access denied: requires CAP_SYS_ADMIN + EINVAL value out of range [0 1] + EBUSY Controller busy + + + +HDIO_SET_SCSI_IDE + + Not implemented, as of 2.6.8.1 + + _