pagecache_get_page
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Name

pagecache_get_page — find and get a page reference

Synopsis

struct page * pagecache_get_page (struct address_space * mapping,
 pgoff_t offset,
 int fgp_flags,
 gfp_t gfp_mask);
 

Arguments

mapping

the address_space to search

offset

the page index

fgp_flags

PCG flags

gfp_mask

gfp mask to use for the page cache data page allocation

Description

Looks up the page cache slot at mapping & offset.

PCG flags modify how the page is returned.

FGP_ACCESSED

the page will be marked accessed

FGP_LOCK

Page is return locked

FGP_CREAT

If page is not present then a new page is allocated using gfp_mask and added to the page cache and the VM's LRU list. The page is returned locked and with an increased refcount. Otherwise, NULL is returned.

If FGP_LOCK or FGP_CREAT are specified then the function may sleep even if the GFP flags specified for FGP_CREAT are atomic.

If there is a page cache page, it is returned with an increased refcount.

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