diff options
| author | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> | 2007-06-27 14:10:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-28 11:38:18 -0700 |
| commit | a66e356c04ece4a96f44b942b68234c3de8ec3f5 (patch) | |
| tree | 16e79721d953bccd37e0a6b506fb2ca686076d18 /kernel/relay.c | |
| parent | 8d62fdebdaf9b866c7e236a8f5cfe90e6dba5773 (diff) | |
| download | lwn-a66e356c04ece4a96f44b942b68234c3de8ec3f5.tar.gz lwn-a66e356c04ece4a96f44b942b68234c3de8ec3f5.zip | |
relayfs: fix overwrites
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>
Diffstat (limited to 'kernel/relay.c')
| -rw-r--r-- | kernel/relay.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/relay.c b/kernel/relay.c index e61156ea4e25..95db8c79fe8f 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -812,7 +812,10 @@ static void relay_file_read_consume(struct rchan_buf *buf, } 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)) @@ -841,8 +844,9 @@ static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos) } if (unlikely(produced - consumed >= n_subbufs)) { - consumed = (produced / n_subbufs) * n_subbufs; + consumed = produced - n_subbufs + 1; buf->subbufs_consumed = consumed; + buf->bytes_consumed = 0; } produced = (produced % n_subbufs) * subbuf_size + buf->offset; |