centos man page for replace_page_cache_page

REPLACE_PAGE_CACHE_P(9) 				    Memory Management in Linux					   REPLACE_PAGE_CACHE_P(9)

NAME
       replace_page_cache_page - replace a pagecache page with a new one

SYNOPSIS
       int replace_page_cache_page(struct page * old, struct page * new, gfp_t gfp_mask);

ARGUMENTS
       old
	   page to be replaced

       new
	   page to replace with

       gfp_mask
	   allocation mode

DESCRIPTION
       This function replaces a page in the pagecache with a new one. On success it acquires the pagecache reference for the new page and drops it
       for the old page. Both the old and new pages must be locked. This function does not add the new page to the LRU, the caller must do that.

       The remove + add is atomic. The only way this function can fail is memory allocation failure.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   REPLACE_PAGE_CACHE_P(9)