tag_pages_for_writeback — tag pages to be written by write_cache_pages
void tag_pages_for_writeback ( | struct address_space * mapping, |
pgoff_t start, | |
pgoff_t end) ; |
struct address_space * mapping
address space structure to write
pgoff_t start
starting page index
pgoff_t end
ending page index (inclusive)
This function scans the page range from start
to end
(inclusive) and tags
all pages that have DIRTY tag set with a special TOWRITE tag. The idea is
that write_cache_pages (or whoever calls this function) will then use
TOWRITE tag to identify pages eligible for writeback. This mechanism is
used to avoid livelocking of writeback by a process steadily creating new
dirty pages in the file (thus it is important for this function to be quick
so that it can tag pages faster than a dirtying process can create them).