f2fs: use writepages->lock for WB_SYNC_ALL

If there are many writepages calls by multiple threads in background, we don't
need to serialize to merge all the bios, since it's background.
In such the case, it'd better to run writepages concurrently.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index e8d4158..0f01878 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1402,7 +1402,7 @@ static int f2fs_write_data_pages(struct address_space *mapping,
 
        diff = nr_pages_to_write(sbi, DATA, wbc);
 
-       if (!S_ISDIR(inode->i_mode)) {
+       if (!S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_ALL) {
                mutex_lock(&sbi->writepages);
                locked = true;
        }