BLK_STOP_QUEUE(9) Block Devices BLK_STOP_QUEUE(9)NAME
blk_stop_queue - stop a queue
SYNOPSIS
void blk_stop_queue(struct request_queue * q);
ARGUMENTS
q
The struct request_queue in question
DESCRIPTION
The Linux block layer assumes that a block driver will consume all entries on the request queue when the request_fn strategy is called.
Often this will not happen, because of hardware limitations (queue depth settings). If a device driver gets a 'queue full' response, or if
it simply chooses not to queue more I/O at one point, it can call this function to prevent the request_fn from being called until the
driver has signalled it's ready to go again. This happens by calling blk_start_queue to restart queue operations. Queue lock must be held.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BLK_STOP_QUEUE(9)
Check Out this Related Man Page
queue(9S) Data Structures for Drivers queue(9S)NAME
queue - STREAMS queue structure
SYNOPSIS
#include <sys/stream.h>
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI)
DESCRIPTION
A STREAMS driver or module consists of two queue structures, one for upstream processing (read) and one for downstream processing
(write). This structure is the major building block of a stream. It contains pointers to the processing procedures, pointers to the next
and previous queues in the stream, flow control parameters, and a pointer defining the position of its messages on the STREAMS scheduler
list.
The queue structure is defined as type queue_t.
STRUCTURE MEMBERS
struct qinit*q_qinfo; /* module or driver entry points */
struct msgb*q_first; /* first message in queue */
struct msgb*q_last; /* last message in queue */
struct queue*q_next; /* next queue in stream */
struct queue*q_link; /* to next queue for scheduling*/
void *q_ptr; /* pointer to private data structure */
size_t q_count; /* approximate size of message queue */
uint_t q_flag; /* status of queue */
ssize_t q_minpsz; /* smallest packet accepted by QUEUE*/
ssize_t q_maxpsz; /*largest packet accepted by QUEUE */
size_t q_hiwat; /* high water mark */
size_t q_lowat; /* low water mark */
Valid flags are as follows:
QENAB Queue is already enabled to run.
QWANTR Someone wants to read queue.
QWANTW Someone wants to write to queue.
QFULL Queue is considered full.
QREADR This is the reader (first) queue.
QUSE This queue is in use (allocation).
QNOENB Do not enable queue by way of putq().
SEE ALSO strqget(9F), strqset(9F), module_info(9S), msgb(9S), qinit(9S), streamtab(9S)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.10 12 Nov 1996 queue(9S)
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