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diff --git a/Documentation/ioctl/hdio.txt b/Documentation/ioctl/hdio.txt deleted file mode 100644 index 18eb98c44ffe..000000000000 --- a/Documentation/ioctl/hdio.txt +++ /dev/null @@ -1,1071 +0,0 @@ - Summary of HDIO_ ioctl calls. - ============================ - - Edward A. Falk <efalk@google.com> - - 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 <linux/hdreg.h>. 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 get sector addressing mode - 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 Set scsi emulation mode on/off - HDIO_SET_SCSI_IDE not implemented yet - - -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 -1 and set - errno to 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 <linux/hdreg.h> - - - -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: - - unsigned 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 cannot - 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 <linux/hdreg.h>, near symbol IDE_NICE_DSC_OVERLAP. - - - - -HDIO_SET_NICE set nice flags - - usage: - - unsigned long nice; - ... - ioctl(fd, HDIO_SET_NICE, nice); - - inputs: - bitmask of nice flags. - - 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. - - Nice flags are listed in <linux/hdreg.h>, starting with - IDE_NICE_DSC_OVERLAP. These values represent shifts. - - - - - -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 - ENXIO No such device: phy dead or ctl_addr == 0 - EIO I/O error: reset timed out or hardware error - - notes: - - Execute a reset on the device as soon as the current IO - operation has completed. - - 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. - - Execute an ATA disk command directly by writing the "taskfile" - registers of the drive. Requires ADMIN and RAWIO access - privileges. - - 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[8] values to be written to taskfile registers - hob_ports[8] high-order bytes, for extended commands. - 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 (see [1]) - - outputs: - - io_ports[] values returned in the taskfile registers - hob_ports[] high-order bytes, for extended commands. - out_flags flags indicating which registers are valid (see [2]) - in_flags flags indicating which registers should be returned - outbuf buffer of data to be transmitted to disk (see [1]) - inbuf buffer of data to be received from disk - - error returns: - EACCES CAP_SYS_ADMIN or CAP_SYS_RAWIO privilege 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. - EIO Drive failed the command. - - notes: - - [1] READ THE FOLLOWING NOTES *CAREFULLY*. THIS IOCTL IS - FULL OF GOTCHAS. Extreme caution should be used with using - this ioctl. A mistake can easily corrupt data or hang the - system. - - [2] Both the input and output buffers are copied from the - user and written back to the user, even when not used. - - [3] If one or more bits are set in out_flags and in_flags is - zero, the following values are used for in_flags.all and - written back into in_flags on completion. - - * IDE_TASKFILE_STD_IN_FLAGS | (IDE_HOB_STD_IN_FLAGS << 8) - if LBA48 addressing is enabled for the drive - * IDE_TASKFILE_STD_IN_FLAGS - if CHS/LBA28 - - The association between in_flags.all and each enable - bitfield flips depending on endianness; fortunately, TASKFILE - only uses inflags.b.data bit and ignores all other bits. - The end result is that, on any endian machines, it has no - effect other than modifying in_flags on completion. - - [4] The default value of SELECT is (0xa0|DEV_bit|LBA_bit) - except for four drives per port chipsets. For four drives - per port chipsets, it's (0xa0|DEV_bit|LBA_bit) for the first - pair and (0x80|DEV_bit|LBA_bit) for the second pair. - - [5] 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. Type ide_reg_valid_t. - 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 - - When out_flags is zero, the following registers are loaded. - - HOB_FEATURE If the drive supports LBA48 - HOB_NSECTOR If the drive supports LBA48 - HOB_SECTOR If the drive supports LBA48 - HOB_LCYL If the drive supports LBA48 - HOB_HCYL If the drive supports LBA48 - FEATURE - NSECTOR - SECTOR - LCYL - HCYL - SELECT First, masked with 0xE0 if LBA48, 0xEF - otherwise; then, or'ed with the default - value of SELECT. - - If any bit in out_flags is set, the following registers are loaded. - - HOB_DATA If out_flags.b.data is set. HOB_DATA will - travel on DD8-DD15 on little endian machines - and on DD0-DD7 on big endian machines. - DATA If out_flags.b.data is set. DATA will - travel on DD0-DD7 on little endian machines - and on DD8-DD15 on big endian machines. - HOB_NSECTOR If out_flags.b.nsector_hob is set - HOB_SECTOR If out_flags.b.sector_hob is set - HOB_LCYL If out_flags.b.lcyl_hob is set - HOB_HCYL If out_flags.b.hcyl_hob is set - FEATURE If out_flags.b.feature is set - NSECTOR If out_flags.b.nsector is set - SECTOR If out_flags.b.sector is set - LCYL If out_flags.b.lcyl is set - HCYL If out_flags.b.hcyl is set - SELECT Or'ed with the default value of SELECT and - loaded regardless of out_flags.b.select. - - Taskfile registers are read back from the drive into - {io|hob}_ports[] after the command completes iff one of the - following conditions is met; otherwise, the original values - will be written back, unchanged. - - 1. The drive fails the command (EIO). - 2. One or more than one bits are set in out_flags. - 3. The requested data_phase is TASKFILE_NO_DATA. - - HOB_DATA If in_flags.b.data is set. It will contain - DD8-DD15 on little endian machines and - DD0-DD7 on big endian machines. - DATA If in_flags.b.data is set. It will contain - DD0-DD7 on little endian machines and - DD8-DD15 on big endian machines. - HOB_FEATURE If the drive supports LBA48 - HOB_NSECTOR If the drive supports LBA48 - HOB_SECTOR If the drive supports LBA48 - HOB_LCYL If the drive supports LBA48 - HOB_HCYL If the drive supports LBA48 - NSECTOR - SECTOR - LCYL - HCYL - - 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 == IN_DMA (queueing not supported) - TASKFILE_OUT_DMA - TASKFILE_OUT_DMAQ == OUT_DMA (queueing not supported) - TASKFILE_P_IN unimplemented - TASKFILE_P_IN_DMA unimplemented - TASKFILE_P_IN_DMAQ unimplemented - TASKFILE_P_OUT unimplemented - TASKFILE_P_OUT_DMA unimplemented - TASKFILE_P_OUT_DMAQ unimplemented - - The req_cmd field classifies the command type. It may be - one of: - - IDE_DRIVE_TASK_NO_DATA - IDE_DRIVE_TASK_SET_XFER unimplemented - IDE_DRIVE_TASK_IN - IDE_DRIVE_TASK_OUT unimplemented - IDE_DRIVE_TASK_RAW_WRITE - - [6] Do not access {in|out}_flags->all except for resetting - all the bits. Always access individual bit fields. ->all - value will flip depending on endianness. For the same - reason, do not use IDE_{TASKFILE|HOB}_STD_{OUT|IN}_FLAGS - constants defined in hdreg.h. - - - -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: - - Commands other than WIN_SMART - args[0] COMMAND - args[1] NSECTOR - args[2] FEATURE - args[3] NSECTOR - - WIN_SMART - 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 - args[3] undefined - args[4+] NSECTOR * 512 bytes of data returned by the command. - - error returns: - EACCES Access denied: requires CAP_SYS_RAWIO - ENOMEM Unable to allocate memory for task - EIO Drive reports error - - notes: - - [1] For commands other than WIN_SMART, args[1] should equal - args[3]. SECTOR, LCYL and HCYL are undefined. For - WIN_SMART, 0x4f and 0xc2 are loaded into LCYL and HCYL - respectively. In both cases SELECT will contain the default - value for the drive. Please refer to HDIO_DRIVE_TASKFILE - notes for the default value of SELECT. - - [2] If NSECTOR value is greater than zero and the drive sets - DRQ when interrupting for the command, NSECTOR * 512 bytes - are read from the device into the area following NSECTOR. - In the above example, the area would be - args[4..4+XFER_SIZE]. 16bit PIO is used regardless of - HDIO_SET_32BIT setting. - - [3] If COMMAND == WIN_SETFEATURES && FEATURE == SETFEATURES_XFER - && NSECTOR >= XFER_SW_DMA_0 && the drive supports any DMA - mode, IDE driver will try to tune the transfer mode of the - drive accordingly. - - - -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 - ENOMSG Device is not a disk drive. - EIO Drive failed the command. - - notes: - - [1] DEV bit (0x10) of SELECT register is ignored and the - appropriate value for the drive is used. All other bits - are used unaltered. - - - -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 appropriate. - - - -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 - - |