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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2014-03-18 08:47:11 +0400
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2014-03-18 11:37:53 +0400
commit50c8cdb35ad8016c52fb2326ef9d65542e3a3e1b (patch)
treedb261148aaa96080b35d61f8b1ac09d1fecb87a4 /fs/f2fs/segment.h
parentd3baf95da5b0bce9fe980eeff6140817d63fabdf (diff)
downloadlinux-50c8cdb35ad8016c52fb2326ef9d65542e3a3e1b.tar.xz
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>
Diffstat (limited to 'fs/f2fs/segment.h')
-rw-r--r--fs/f2fs/segment.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index bbd976100d14..9fc46ee27bb8 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;
+}