BLK_INSERT_REQUEST(9) Block Devices BLK_INSERT_REQUEST(9)NAME
blk_insert_request - insert a special request into a request queue
SYNOPSIS
void blk_insert_request(struct request_queue * q, struct request * rq, int at_head, void * data);
ARGUMENTS
q
request queue where request should be inserted
rq
request to be inserted
at_head
insert request at head or tail of queue
data
private data
DESCRIPTION
Many block devices need to execute commands asynchronously, so they don't block the whole kernel from preemption during request execution.
This is accomplished normally by inserting aritficial requests tagged as REQ_TYPE_SPECIAL in to the corresponding request queue, and
letting them be scheduled for actual execution by the request queue.
We have the option of inserting the head or the tail of the queue. Typically we use the tail for new ioctls and so forth. We use the head
of the queue for things like a QUEUE_FULL message from a device, or a host that is unable to accept a particular command.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BLK_INSERT_REQUEST(9)
Check Out this Related Man Page
qenable(8B) PBS qenable(8B)NAME
qenable - enable input to a pbs destination
SYNOPSIS
qenable destination ...
DESCRIPTION
The qenable command directs that a destination should accept batch jobs.
The qenable command sends a Manage request to the batch server specified by destination. If the command is accepted, the destination will
accept Queue Job requests which specified the queue.
In order to execute qenable, the user must have PBS Operation or Manager privilege.
OPERANDS
The qenable command accepts one or more destination operands. The operands are one of three forms:
queue
@server
queue@server
If queue is specified, the request is to enable that queue at the default server. If the @server form is given, the request is to enable
all the queues at that server. If a full destination identifier, queue@server, is given, the request is to enable the named queue at the
named server.
STANDARD ERROR
The qenable command will write a diagnostic message to standard error for each error occurrence.
EXIT STATUS
Upon successful processing of all the operands presented to the qenable command, the exit status will be a value of zero.
If the qenable command fails to process any operand, the command exits with a value greater than zero.
SEE ALSO pbs_server(8B), qdisable(8B), and qmgr(1B)Localqenable(8B)
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