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authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-21 10:59:34 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-06 10:40:12 +0100
commitb6cce9b8e8139e8b9130dd2efe950bac0d4fea50 (patch)
tree4695de59132398d90c1378636e1cd3cbdc261dc4
parentc1df5a63716b0f73e95b1b26d878691e6175ea34 (diff)
splice: reinstate SIGPIPE/EPIPE handling
commit 52bce91165e5f2db422b2b972e83d389e5e4725c upstream. Commit 8924feff66f3 ("splice: lift pipe_lock out of splice_to_pipe()") caused a regression when there were no more readers left on a pipe that was being spliced into: rather than the expected SIGPIPE and -EPIPE return value, the writer would end up waiting forever for space to free up (which obviously was not going to happen with no readers around). Fixes: 8924feff66f3 ("splice: lift pipe_lock out of splice_to_pipe()") Reported-and-tested-by: Andreas Schwab <schwab@linux-m68k.org> Debugged-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/splice.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/splice.c b/fs/splice.c
index 5a7750bd2eea..63b8f54485dc 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,