relayfs: fix overwrites
authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Wed, 27 Jun 2007 21:10:04 +0000 (14:10 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Thu, 28 Jun 2007 18:38:18 +0000 (11:38 -0700)
When I use relayfs with "overwrite" mode, read() still sets incorrect
number of consumed bytes.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Tom Zanussi <zanussi@us.ibm.com>
Acked-by: David Wilder <dwilder@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/relay.c

index e61156ea4e2522c6ffdaf1dfdfc0c4b892c17d8d..95db8c79fe8f3371249029a19e48e817ffc34d12 100644 (file)
@@ -812,7 +812,10 @@ static void relay_file_read_consume(struct rchan_buf *buf,
        }
 
        buf->bytes_consumed += bytes_consumed;
        }
 
        buf->bytes_consumed += bytes_consumed;
-       read_subbuf = read_pos / buf->chan->subbuf_size;
+       if (!read_pos)
+               read_subbuf = buf->subbufs_consumed % n_subbufs;
+       else
+               read_subbuf = read_pos / buf->chan->subbuf_size;
        if (buf->bytes_consumed + buf->padding[read_subbuf] == subbuf_size) {
                if ((read_subbuf == buf->subbufs_produced % n_subbufs) &&
                    (buf->offset == subbuf_size))
        if (buf->bytes_consumed + buf->padding[read_subbuf] == subbuf_size) {
                if ((read_subbuf == buf->subbufs_produced % n_subbufs) &&
                    (buf->offset == subbuf_size))
@@ -841,8 +844,9 @@ static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos)
        }
 
        if (unlikely(produced - consumed >= n_subbufs)) {
        }
 
        if (unlikely(produced - consumed >= n_subbufs)) {
-               consumed = (produced / n_subbufs) * n_subbufs;
+               consumed = produced - n_subbufs + 1;
                buf->subbufs_consumed = consumed;
                buf->subbufs_consumed = consumed;
+               buf->bytes_consumed = 0;
        }
        
        produced = (produced % n_subbufs) * subbuf_size + buf->offset;
        }
        
        produced = (produced % n_subbufs) * subbuf_size + buf->offset;