[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: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/fs/buffer.c b/fs/buffer.c
index 5e4a90e..62cfd17 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2867,22 +2867,22 @@
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);
}
}