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PAGECACHE_GET_PAGE(9) Memory Management in Linux PAGECACHE_GET_PAGE(9)

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.

COPYRIGHT

May 2018 Kernel Hackers Manual 3.16