pagecache_get_page — find and get a page reference
struct page * pagecache_get_page ( | struct address_space * mapping, |
| pgoff_t offset, | |
| int fgp_flags, | |
gfp_t gfp_mask); |
struct address_space * mappingthe address_space to search
pgoff_t offsetthe page index
int fgp_flagsPCG flags
gfp_t gfp_maskgfp mask to use for the page cache data page allocation
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.