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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

April 2019 Kernel Hackers Manual 4.9.