Man page 9 : grab_cache_page_nowait

grab_cache_page_nowait - returns locked page at given index in given cache

struct page * grab_cache_page_nowait(struct address_space *  mapping , pgoff_t  index );

mapping
    target address_space

index
    the page index

Same as grab_cache_page, but do not wait if the page is unavailable. This is intended for speculative data generators, where the data can be regenerated if the page couldnAqt be grabbed. This routine should be safe to call while holding the lock for another page.

Clear __GFP_FS when allocating the page to avoid recursion into the fs and deadlock against the callerAqs locked page.