On Dez 18 2016, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> Regardless - Andreas, can you verify that that fixes your issues? I'm
> assuming you had some real load that made you notice this, not just he
> dummy example..
FWIW, I have verified that the testsuite of pv succeeds with this patch:
diff --git a/fs/splice.c b/fs/splice.c
index 5a7750bd2e..63b8f54485 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1086,7 +1086,13 @@ EXPORT_SYMBOL(do_splice_direct);
static int wait_for_space(struct pipe_inode_info *pipe, unsigned flags)
{
- while (pipe->nrbufs == pipe->buffers) {
+ for (;;) {
+ if (unlikely(!pipe->readers)) {
+ send_sig(SIGPIPE, current, 0);
+ return -EPIPE;
+ }
+ if (pipe->nrbufs != pipe->buffers)
+ return 0;
if (flags & SPLICE_F_NONBLOCK)
return -EAGAIN;
if (signal_pending(current))
@@ -1095,7 +1101,6 @@ static int wait_for_space(struct pipe_inode_info *pipe, unsigned flags)
pipe_wait(pipe);
pipe->waiting_writers--;
}
- return 0;
}
static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe,
--
2.11.0
Andreas.
--
Andreas Schwab, schwab@xxxxxxxxxxxxxx
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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