X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=fs%2Fsplice.c;h=3009652a41c85c28e048b7902dbce03a159cfc2e;hb=e69ec487b2c7c82ef99b4b15122f58a2a99289a3;hp=f2400ce7d52846cac129ddda5be03081951dd59f;hpb=f7a1a1db9877799e15aba047acd799c2df811f88;p=linux.git

diff --git a/fs/splice.c b/fs/splice.c
index f2400ce7d528..3009652a41c8 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -495,7 +495,7 @@ static int splice_from_pipe_feed(struct pipe_inode_info *pipe, struct splice_des
 	unsigned int mask = pipe->ring_size - 1;
 	int ret;
 
-	while (!pipe_empty(tail, head)) {
+	while (!pipe_empty(head, tail)) {
 		struct pipe_buffer *buf = &pipe->bufs[tail & mask];
 
 		sd->len = buf->len;
@@ -559,7 +559,7 @@ static int splice_from_pipe_next(struct pipe_inode_info *pipe, struct splice_des
 		if (!pipe->writers)
 			return 0;
 
-		if (!pipe->waiting_writers && sd->num_spliced)
+		if (sd->num_spliced)
 			return 0;
 
 		if (sd->flags & SPLICE_F_NONBLOCK)
@@ -711,9 +711,7 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
 	splice_from_pipe_begin(&sd);
 	while (sd.total_len) {
 		struct iov_iter from;
-		unsigned int head = pipe->head;
-		unsigned int tail = pipe->tail;
-		unsigned int mask = pipe->ring_size - 1;
+		unsigned int head, tail, mask;
 		size_t left;
 		int n;
 
@@ -732,6 +730,10 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
 			}
 		}
 
+		head = pipe->head;
+		tail = pipe->tail;
+		mask = pipe->ring_size - 1;
+
 		/* build the vector */
 		left = sd.total_len;
 		for (n = 0; !pipe_empty(head, tail) && left && n < nbufs; tail++, n++) {
@@ -1096,9 +1098,7 @@ static int wait_for_space(struct pipe_inode_info *pipe, unsigned flags)
 			return -EAGAIN;
 		if (signal_pending(current))
 			return -ERESTARTSYS;
-		pipe->waiting_writers++;
 		pipe_wait(pipe);
-		pipe->waiting_writers--;
 	}
 }
 
@@ -1480,11 +1480,9 @@ static int ipipe_prep(struct pipe_inode_info *pipe, unsigned int flags)
 		}
 		if (!pipe->writers)
 			break;
-		if (!pipe->waiting_writers) {
-			if (flags & SPLICE_F_NONBLOCK) {
-				ret = -EAGAIN;
-				break;
-			}
+		if (flags & SPLICE_F_NONBLOCK) {
+			ret = -EAGAIN;
+			break;
 		}
 		pipe_wait(pipe);
 	}
@@ -1525,9 +1523,7 @@ static int opipe_prep(struct pipe_inode_info *pipe, unsigned int flags)
 			ret = -ERESTARTSYS;
 			break;
 		}
-		pipe->waiting_writers++;
 		pipe_wait(pipe);
-		pipe->waiting_writers--;
 	}
 
 	pipe_unlock(pipe);
@@ -1749,13 +1745,6 @@ static int link_pipe(struct pipe_inode_info *ipipe,
 		i_tail++;
 	} while (len);
 
-	/*
-	 * return EAGAIN if we have the potential of some data in the
-	 * future, otherwise just return 0
-	 */
-	if (!ret && ipipe->waiting_writers && (flags & SPLICE_F_NONBLOCK))
-		ret = -EAGAIN;
-
 	pipe_unlock(ipipe);
 	pipe_unlock(opipe);