since pipe_lock is the outermost now, we don't need to drop/regain
socket locks around the call of splice_to_pipe() from skb_splice_bits(),
which kills the need to have a socket-specific callback; we can just
call splice_to_pipe() and be done with that.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
include/linux/skbuff.h | 8 +-------
net/core/skbuff.c | 28 ++--------------------------
net/ipv4/tcp.c | 3 +--
net/kcm/kcmsock.c | 16 +---------------
net/unix/af_unix.c | 17 +----------------
5 files changed, 6 insertions(+), 66 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 0f665cb..f520251 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3021,15 +3021,9 @@ int skb_copy_bits(const struct sk_buff *skb, int offset,
void *to, int len);
int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len);
__wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset, u8 *to,
int len, __wsum csum);
-ssize_t skb_socket_splice(struct sock *sk,
- struct pipe_inode_info *pipe,
- struct splice_pipe_desc *spd);
int skb_splice_bits(struct sk_buff *skb, struct sock *sk, unsigned int offset,
struct pipe_inode_info *pipe, unsigned int len,
- unsigned int flags,
- ssize_t (*splice_cb)(struct sock *,
- struct pipe_inode_info *,
- struct splice_pipe_desc *));
+ unsigned int flags);
void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to);
unsigned int skb_zerocopy_headlen(const struct sk_buff *from);
int skb_zerocopy(struct sk_buff *to, struct sk_buff *from,
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 3864b4b6..208a9bc 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1962,37 +1962,13 @@ static bool __skb_splice_bits(struct sk_buff *skb,
struct pipe_inode_info *pipe,
return false;
}
-ssize_t skb_socket_splice(struct sock *sk,
- struct pipe_inode_info *pipe,
- struct splice_pipe_desc *spd)
-{
- int ret;
-
- /* Drop the socket lock, otherwise we have reverse
- * locking dependencies between sk_lock and i_mutex
- * here as compared to sendfile(). We enter here
- * with the socket lock held, and splice_to_pipe() will
- * grab the pipe inode lock. For sendfile() emulation,
- * we call into ->sendpage() with the i_mutex lock held
- * and networking will grab the socket lock.
- */
- release_sock(sk);
- ret = splice_to_pipe(pipe, spd);
- lock_sock(sk);
-
- return ret;
-}
-
/*
* Map data from the skb to a pipe. Should handle both the linear part,
* the fragments, and the frag list.
*/
int skb_splice_bits(struct sk_buff *skb, struct sock *sk, unsigned int offset,
struct pipe_inode_info *pipe, unsigned int tlen,
- unsigned int flags,
- ssize_t (*splice_cb)(struct sock *,
- struct pipe_inode_info *,
- struct splice_pipe_desc *))
+ unsigned int flags)
{
struct partial_page partial[MAX_SKB_FRAGS];
struct page *pages[MAX_SKB_FRAGS];
@@ -2009,7 +1985,7 @@ int skb_splice_bits(struct sk_buff *skb, struct sock *sk,
unsigned int offset,
__skb_splice_bits(skb, pipe, &offset, &tlen, &spd, sk);
if (spd.nr_pages)
- ret = splice_cb(sk, pipe, &spd);
+ ret = splice_to_pipe(pipe, &spd);
return ret;
}
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index ffbb218..ddd2179 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -688,8 +688,7 @@ static int tcp_splice_data_recv(read_descriptor_t *rd_desc,
struct sk_buff *skb,
int ret;
ret = skb_splice_bits(skb, skb->sk, offset, tss->pipe,
- min(rd_desc->count, len), tss->flags,
- skb_socket_splice);
+ min(rd_desc->count, len), tss->flags);
if (ret > 0)
rd_desc->count -= ret;
return ret;
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index cb39e05..994baae 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -1461,19 +1461,6 @@ out:
return copied ? : err;
}
-static ssize_t kcm_sock_splice(struct sock *sk,
- struct pipe_inode_info *pipe,
- struct splice_pipe_desc *spd)
-{
- int ret;
-
- release_sock(sk);
- ret = splice_to_pipe(pipe, spd);
- lock_sock(sk);
-
- return ret;
-}
-
static ssize_t kcm_splice_read(struct socket *sock, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)
@@ -1503,8 +1490,7 @@ static ssize_t kcm_splice_read(struct socket *sock,
loff_t *ppos,
if (len > rxm->full_len)
len = rxm->full_len;
- copied = skb_splice_bits(skb, sk, rxm->offset, pipe, len, flags,
- kcm_sock_splice);
+ copied = skb_splice_bits(skb, sk, rxm->offset, pipe, len, flags);
if (copied < 0) {
err = copied;
goto err_out;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index f1dffe8..e7707ca 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2488,28 +2488,13 @@ static int unix_stream_recvmsg(struct socket *sock,
struct msghdr *msg,
return unix_stream_read_generic(&state);
}
-static ssize_t skb_unix_socket_splice(struct sock *sk,
- struct pipe_inode_info *pipe,
- struct splice_pipe_desc *spd)
-{
- int ret;
- struct unix_sock *u = unix_sk(sk);
-
- mutex_unlock(&u->readlock);
- ret = splice_to_pipe(pipe, spd);
- mutex_lock(&u->readlock);
-
- return ret;
-}
-
static int unix_stream_splice_actor(struct sk_buff *skb,
int skip, int chunk,
struct unix_stream_read_state *state)
{
return skb_splice_bits(skb, state->socket->sk,
UNIXCB(skb).consumed + skip,
- state->pipe, chunk, state->splice_flags,
- skb_unix_socket_splice);
+ state->pipe, chunk, state->splice_flags);
}
static ssize_t unix_stream_splice_read(struct socket *sock, loff_t *ppos,
--
2.9.3
|