READ_CACHE_PAGE - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Memory Management in Linux

NAMEread_cache_page − read into page cache, fill it if needed

SYNOPSISstruct page * read_cache_page(struct address_space * mapping, pgoff_t index, int (*filler) (void *, struct page *), void * data);

ARGUMENTSmapping the page´s address_space index the page index filler function to perform the read data first arg to filler(data, page) function, often left as NULL

DESCRIPTIONRead into the page cache​. If a page already exists, and PageUptodate is not set, try to fill the page then wait for it to become unlocked​. If the page does not get brought uptodate, return −EIO​.

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