From 50c8cdb35ad8016c52fb2326ef9d65542e3a3e1b Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Tue, 18 Mar 2014 13:47:11 +0900 Subject: 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 --- fs/f2fs/segment.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'fs/f2fs/segment.h') diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h index bbd9761..9fc46ee 100644 --- a/fs/f2fs/segment.h +++ b/fs/f2fs/segment.h @@ -683,3 +683,27 @@ static inline int nr_pages_to_skip(struct f2fs_sb_info *sbi, int type) else return 0; } + +/* + * When writing pages, it'd better align nr_to_write for segment size. + */ +static inline long nr_pages_to_write(struct f2fs_sb_info *sbi, int type, + struct writeback_control *wbc) +{ + long nr_to_write, desired; + + if (wbc->sync_mode != WB_SYNC_NONE) + return 0; + + nr_to_write = wbc->nr_to_write; + + if (type == DATA) + desired = 4096; + else if (type == NODE) + desired = 3 * max_hw_blocks(sbi); + else + desired = MAX_BIO_BLOCKS(max_hw_blocks(sbi)); + + wbc->nr_to_write = desired; + return desired - nr_to_write; +} -- cgit v1.1