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BIO(4) FreeBSD Kernel Interfaces Manual BIO(4) NAME bio -- block I/O ioctl tunnel pseudo-device SYNOPSIS pseudo-device bio [count] DESCRIPTION The bio driver provides userland applications ioctl(2) access to devices otherwise not found as /dev nodes. The /dev/bio device node operates by delegating ioctl calls to a requested device driver. Only drivers which have registered with the bio device can be accessed via this interface. If count is given in the specification, and is greater than 0, a maximum of one bio device is created. The following device drivers register with bio for volume management: ami(4) American Megatrends Inc. MegaRAID PATA/SATA/SCSI RAID controller arc(4) Areca Technology Corporation SAS/SATA RAID con- troller cac(4) Compaq Smart Array 2/3/4 SCSI RAID controller ciss(4) Compaq Smart Array SAS/SATA/SCSI RAID controller ips(4) IBM SATA/SCSI ServeRAID controller mfi(4) LSI Logic & Dell MegaRAID SAS RAID controller mfii(4) LSI Logic MegaRAID SAS Fusion RAID controller mpi(4) LSI Logic Fusion-MPT Message Passing Interface mpii(4) LSI Logic Fusion-MPT Message Passing Interface II softraid(4) Software RAID The following device drivers register with bio to provide enclosure man- agement: safte(4) SCSI Accessed Fault-Tolerant Enclosure ses(4) SCSI Enclosure Services The following ioctl calls apply to the bio device: BIOCLOCATE struct bio_locate * Locate a named device and give back a cookie to the application for subsequent ioctl calls. The cookie is used to tunnel further ioctls to the right device. BIOCINQ struct bioc_inq * Retrieve number of volumes and physical disks for a specific de- vice. BIOCDISK struct bioc_disk * Retrieve detailed information for the specified physical disk. Information returned can include status, size, channel, target, lun, vendor name, serial number and processor device (ses or safte). BIOCVOL struct bioc_vol * Retrieve detailed information for the specified volume. Informa- tion returned can include status, size, RAID level, number of disks, device name association (sd?) and vendor name. BIOCALARM struct bioc_alarm * Control the alarm beeper on the device. Supported states are: disable alarm, enable alarm, silence alarm, status and test alarm. Note: These options might not be supported on all hardware. BIOCBLINK struct bioc_blink * Blink an LED of the specified physical disk. Supported blink states are: blink LED, unblink LED and blink alarm LED. Note: This option is only supported if the disk is governed by ses(4) or safte(4) and the hardware supports hardware blinking. BIOCSETSTATE struct bioc_setstate * Alter the state of specified physical disk. Supported states are: create hot-spare, online disk and offline disk. The following ioctl calls apply to the bio device only when talking to a softraid(4) device: BIOCCREATERAID struct bioc_createraid * Create a new volume or assemble an existing volume. The volume will be attached as a system disk, if this capability is sup- ported by the volume discipline. BIOCDELETERAID struct bioc_deleteraid * Remove system disk (if present) and disassemble the softraid(4) volume. BIOCDISCIPLINE struct bioc_discipline * Dispatch a discipline specific ioctl. BIOCINSTALLBOOT struct bioc_installboot * Install a boot loader. FILES /dev/bio ioctl tunnel device SEE ALSO ioctl(2), softraid(4), bioctl(8) HISTORY The bio driver first appeared in OpenBSD 3.2. AUTHORS The bio driver was written by Niklas Hallqvist <niklas@openbsd.org>. The API was written by Marco Peereboom <marco@openbsd.org>. FreeBSD 13.0 November 26, 2016 FreeBSD 13.0
NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY | AUTHORS
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