f2fs: introduce nr_pages_to_write for segment alignment
This patch introduces nr_pages_to_write to align page writes to the segment
or other operational unit size, which can be tuned according to the system
environment.
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index aef32f3..2a00c94 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -187,18 +187,19 @@
struct writeback_control *wbc)
{
struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
- int nrpages = nr_pages_to_skip(sbi, META);
- long written;
+ long diff, written;
/* collect a number of dirty meta pages and write together */
- if (wbc->for_kupdate || get_pages(sbi, F2FS_DIRTY_META) < nrpages)
+ if (wbc->for_kupdate ||
+ get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
goto skip_write;
/* if mounting is failed, skip writing node pages */
mutex_lock(&sbi->cp_mutex);
- written = sync_meta_pages(sbi, META, nrpages);
+ diff = nr_pages_to_write(sbi, META, wbc);
+ written = sync_meta_pages(sbi, META, wbc->nr_to_write);
mutex_unlock(&sbi->cp_mutex);
- wbc->nr_to_write -= written;
+ wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
return 0;
skip_write: