SVR5

getnextpg(D3)

getnextpg -- get next page pointer

Synopsis (Not in current DDI version)

   #include <sys/types.h>
   #include <vm/page.h>
   #include <sys/buf.h>
   #include <sys/ddi.h>

   page_t *getnextpg(buf_t *bp, page_t *pp);

Description

getnextpg returns a pointer to the next page in a buffer header's page list [see buf(D4)] during a paged-I/O request. A paged-I/O request is identified by the B_PAGEIO flag being set in the ``b_flags'' field of the buffer header passed to a driver's strategy(D2) routine.

Given a buffer header, bp, and a pointer to the page, pp, returned from the previous call to getnextpg, the next page is returned. If pp is NULL, the first page in the page list is returned.

Arguments

bp: Pointer to the buffer header structure.
pp: Pointer to the previous page structure returned.

Return values

On success, a pointer to the next page structure in the page list is returned. If the end of the list is reached, NULL is returned.

Usage

B_PAGEIO won't be set unless the driver has the D_NOBRKUP flag set [see devflag(D1).]

Context and synchronization

Non-blockable, interrupt, user, or blockable context.

Hardware applicability

All

Version applicability

ddi: 3, 5, 5mp, 6, 6mp, 7, 7mp, 7.1, 7.1mp

References

bp_mapin(D3), bp_mapout(D3), buf(D4) devflag(D1), pptophys(D3), strategy(D2)