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Commit e60e5c50 authored by OGAWA Hirofumi's avatar OGAWA Hirofumi Committed by Linus Torvalds
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[PATCH] Trivial optimization of ll_rw_block() 



The ll_rw_block() needs to get ref-count only if it submits a buffer().  This
patch avoids the needless get/put of ref-count.

Signed-off-by: default avatarOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 5b00226d

fs/buffer.c

+2 −2
Original line number Diff line number Diff line
@@ -2867,22 +2867,22 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[]) 
		else if (test_set_buffer_locked(bh))

			continue;



		get_bh(bh);

		if (rw == WRITE || rw == SWRITE) {

			if (test_clear_buffer_dirty(bh)) {

				bh->b_end_io = end_buffer_write_sync;

				get_bh(bh);

				submit_bh(WRITE, bh);

				continue;

			}

		} else {

			if (!buffer_uptodate(bh)) {

				bh->b_end_io = end_buffer_read_sync;

				get_bh(bh);

				submit_bh(rw, bh);

				continue;

			}

		}

		unlock_buffer(bh);

		put_bh(bh);

	}

}