BLK_RQ_MAP_KERN(9) Block Devices BLK_RQ_MAP_KERN(9)NAME
blk_rq_map_kern - map kernel data to a request, for REQ_TYPE_BLOCK_PC usage
SYNOPSIS
int blk_rq_map_kern(struct request_queue * q, struct request * rq, void * kbuf, unsigned int len, gfp_t gfp_mask);
ARGUMENTS
q
request queue where request should be inserted
rq
request to fill
kbuf
the kernel buffer
len
length of user data
gfp_mask
memory allocation flags
DESCRIPTION
Data will be mapped directly if possible. Otherwise a bounce buffer is used. Can be called multple times to append multple buffers.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BLK_RQ_MAP_KERN(9)
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USB_SG_INIT(9) USB Core APIs USB_SG_INIT(9)NAME
usb_sg_init - initializes scatterlist-based bulk/interrupt I/O request
SYNOPSIS
int usb_sg_init(struct usb_sg_request * io, struct usb_device * dev, unsigned pipe, unsigned period, struct scatterlist * sg, int nents,
size_t length, gfp_t mem_flags);
ARGUMENTS
io
request block being initialized. until usb_sg_wait returns, treat this as a pointer to an opaque block of memory,
dev
the usb device that will send or receive the data
pipe
endpoint "pipe" used to transfer the data
period
polling rate for interrupt endpoints, in frames or (for high speed endpoints) microframes; ignored for bulk
sg
scatterlist entries
nents
how many entries in the scatterlist
length
how many bytes to send from the scatterlist, or zero to send every byte identified in the list.
mem_flags
SLAB_* flags affecting memory allocations in this call
DESCRIPTION
Returns zero for success, else a negative errno value. This initializes a scatter/gather request, allocating resources such as I/O mappings
and urb memory (except maybe memory used by USB controller drivers).
The request must be issued using usb_sg_wait, which waits for the I/O to complete (or to be canceled) and then cleans up all resources
allocated by usb_sg_init.
The request may be canceled with usb_sg_cancel, either before or after usb_sg_wait is called.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 USB_SG_INIT(9)
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