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scsi_internal_device_block(9) [centos man page]

SCSI_INTERNAL_DEVICE(9) 					  SCSI mid layer					   SCSI_INTERNAL_DEVICE(9)

NAME
scsi_internal_device_block - internal function to put a device temporarily into the SDEV_BLOCK state SYNOPSIS
int scsi_internal_device_block(struct scsi_device * sdev); ARGUMENTS
sdev device to block DESCRIPTION
Block request made by scsi lld's to temporarily stop all scsi commands on the specified device. Called from interrupt or normal process context. Returns zero if successful or error if not NOTES
This routine transitions the device to the SDEV_BLOCK state (which must be a legal transition). When the device is in this state, all commands are deferred until the scsi lld reenables the device with scsi_device_unblock or device_block_tmo fires. AUTHORS
James Bottomley <James.Bottomley@hansenpartnership.com> Author. Rob Landley <rob@landley.net> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SCSI_INTERNAL_DEVICE(9)

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TAPSET::SCSI(3stap)													       TAPSET::SCSI(3stap)

NAME
tapset::scsi - systemtap scsi probe points DESCRIPTION
This family of probe points is used to probe the SCSI activities. It contains the following probe points: scsi.ioentry Fires when SCSI mid layer prepares a SCSI request Arguments: disk_major The major number of the disk disk_minor The minor number of the disk device_state The current state of the device. The possible values could be: SDEV_CREATED = 1, /* device created but not added to sysfs * Only internal commands allowed (for inq) */ SDEV_RUNNING = 2, /* device properly configured * All commands allowed */ SDEV_CANCEL = 3, /* beginning to delete device * Only error handler commands allowed */ SDEV_DEL = 4, /* device deleted * no commands allowed */ SDEV_QUIESCE = 5, /* Device quiescent. No block commands * will be accepted, only specials (which * originate in the mid-layer) */ SDEV_OFFLINE = 6, /* Device offlined (by error handling or * user request */ SDEV_BLOCK = 7, /* Device blocked by scsi lld. No scsi * commands from user or midlayer should be issued * to the scsi lld. */ scsi.iodispatching Fires when the SCSI mid layer dispatches a SCSI command to the low level driver Arguments: host_no The host number channel The channel number lun The lun number dev_id The scsi device id device_state The current state of the device. data_direction The data_direction specifies whether this command is from/to the device. The possible values could be: DMA_BIDIRECTIONAL = 0, DMA_TO_DEVICE = 1, DMA_FROM_DEVICE = 2, DMA_NONE = 3, request_buffer The request buffer address req_bufflen The request buffer length scsi.iodone Fires when a SCSI command is done by low level driver and enqueued into the done queue. Arguments: host_no The host number channel The channel number lun The lun number dev_id The scsi device id device_state The current state of the device data_direction The data_direction specifies whether this command is from/to the device. scsi.iocompleted Fires when SCSI mid layer runs the completion processing for block device I/O requests Arguments: host_no The host number channel The channel number lun The lun number dev_id The scsi device id device_state The current state of the device data_direction The data_direction specifies whether this command is from/to the device. goodbytes The bytes completed. SEE ALSO
stap(1), stapprobes(3stap) IBM
TAPSET::SCSI(3stap)
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