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We use @nr_written to record how many pages have been started by
btrfs_run_delalloc_range().
Currently there are only two cases that would populate @nr_written:
- Inline extent creation
- Compressed write
But both cases will also set @page_started to one.
In fact, in writepage_delalloc() we have the following code, showing
that @nr_written is really only utilized for above two cases:
/* did the fill delalloc function already unlock and start
* the IO?
*/
if (page_started) {
/*
* we've unlocked the page, so we can't update
* the mapping's writeback index, just update
* nr_to_write.
*/
wbc->nr_to_write -= nr_written;
return 1;
}
But for such cases, writepage_delalloc() will return 1, and exit
__extent_writepage() without going through __extent_writepage_io().
Thus this means, inside __extent_writepage_io(), we always get
@nr_written as 0.
So this patch is going to remove the unnecessary parameter from the
following functions:
- writepage_delalloc()
As @nr_written passed in is always the initial value 0.
Although inside that function, we still need a local @nr_written
to update wbc->nr_to_write.
- __extent_writepage_io()
As explained above, @nr_written passed in can only be 0.
This also means we can remove one update_nr_written() call.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
83f1b68002