Merge commit 'c104f1fa1ecf4ee0fc06e31b1f77630b2551be81' into stable/for-linus-3.4

* commit 'c104f1fa1ecf4ee0fc06e31b1f77630b2551be81': (14566 commits)
  cpufreq: OMAP: fix build errors: depends on ARCH_OMAP2PLUS
  sparc64: Eliminate obsolete __handle_softirq() function
  sparc64: Fix bootup crash on sun4v.
  kconfig: delete last traces of __enabled_ from autoconf.h
  Revert "kconfig: fix __enabled_ macros definition for invisible and un-selected symbols"
  kconfig: fix IS_ENABLED to not require all options to be defined
  irq_domain: fix type mismatch in debugfs output format
  staging: android: fix mem leaks in __persistent_ram_init()
  staging: vt6656: Don't leak memory in drivers/staging/vt6656/ioctl.c::private_ioctl()
  staging: iio: hmc5843: Fix crash in probe function.
  panic: fix stack dump print on direct call to panic()
  drivers/rtc/rtc-pl031.c: enable clock on all ST variants
  Revert "mm: vmscan: fix misused nr_reclaimed in shrink_mem_cgroup_zone()"
  hugetlb: fix race condition in hugetlb_fault()
  drivers/rtc/rtc-twl.c: use static register while reading time
  drivers/rtc/rtc-s3c.c: add placeholder for driver private data
  drivers/rtc/rtc-s3c.c: fix compilation error
  MAINTAINERS: add PCDP console maintainer
  memcg: do not open code accesses to res_counter members
  drivers/rtc/rtc-efi.c: fix section mismatch warning
  ...

1 files changed, 65 insertions, 45 deletions

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index aad8fb699989..d510353ef431 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -293,7 +293,7 @@ static struct sock *unix_find_socket_byinode(struct inode *i)
         spin_lock(&unix_table_lock);
         sk_for_each(s, node,
                     &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) {
-                struct dentry *dentry = unix_sk(s)->dentry;
+                struct dentry *dentry = unix_sk(s)->path.dentry;
 
                 if (dentry && dentry->d_inode == i) {
                         sock_hold(s);
@@ -377,8 +377,7 @@ static void unix_sock_destructor(struct sock *sk)
 static int unix_release_sock(struct sock *sk, int embrion)
 {
         struct unix_sock *u = unix_sk(sk);
-        struct dentry *dentry;
-        struct vfsmount *mnt;
+        struct path path;
         struct sock *skpair;
         struct sk_buff *skb;
         int state;
@@ -389,10 +388,9 @@ static int unix_release_sock(struct sock *sk, int embrion)
         unix_state_lock(sk);
         sock_orphan(sk);
         sk->sk_shutdown = SHUTDOWN_MASK;
-        dentry       = u->dentry;
-        u->dentry    = NULL;
-        mnt          = u->mnt;
-        u->mnt       = NULL;
+        path         = u->path;
+        u->path.dentry = NULL;
+        u->path.mnt = NULL;
         state = sk->sk_state;
         sk->sk_state = TCP_CLOSE;
         unix_state_unlock(sk);
@@ -425,10 +423,8 @@ static int unix_release_sock(struct sock *sk, int embrion)
                 kfree_skb(skb);
         }
 
-        if (dentry) {
-                dput(dentry);
-                mntput(mnt);
-        }
+        if (path.dentry)
+                path_put(&path);
 
         sock_put(sk);
 
@@ -530,6 +526,16 @@ static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *,
 static int unix_seqpacket_recvmsg(struct kiocb *, struct socket *,
                                   struct msghdr *, size_t, int);
 
+static void unix_set_peek_off(struct sock *sk, int val)
+{
+        struct unix_sock *u = unix_sk(sk);
+
+        mutex_lock(&u->readlock);
+        sk->sk_peek_off = val;
+        mutex_unlock(&u->readlock);
+}
+
+
 static const struct proto_ops unix_stream_ops = {
         .family =       PF_UNIX,
         .owner =        THIS_MODULE,
@@ -549,6 +555,7 @@ static const struct proto_ops unix_stream_ops = {
         .recvmsg =      unix_stream_recvmsg,
         .mmap =         sock_no_mmap,
         .sendpage =     sock_no_sendpage,
+        .set_peek_off = unix_set_peek_off,
 };
 
 static const struct proto_ops unix_dgram_ops = {
@@ -570,6 +577,7 @@ static const struct proto_ops unix_dgram_ops = {
         .recvmsg =      unix_dgram_recvmsg,
         .mmap =         sock_no_mmap,
         .sendpage =     sock_no_sendpage,
+        .set_peek_off = unix_set_peek_off,
 };
 
 static const struct proto_ops unix_seqpacket_ops = {
@@ -591,6 +599,7 @@ static const struct proto_ops unix_seqpacket_ops = {
         .recvmsg =      unix_seqpacket_recvmsg,
         .mmap =         sock_no_mmap,
         .sendpage =     sock_no_sendpage,
+        .set_peek_off = unix_set_peek_off,
 };
 
 static struct proto unix_proto = {
@@ -628,8 +637,8 @@ static struct sock *unix_create1(struct net *net, struct socket *sock)
         sk->sk_max_ack_backlog  = net->unx.sysctl_max_dgram_qlen;
         sk->sk_destruct         = unix_sock_destructor;
         u         = unix_sk(sk);
-        u->dentry = NULL;
-        u->mnt    = NULL;
+        u->path.dentry = NULL;
+        u->path.mnt = NULL;
         spin_lock_init(&u->lock);
         atomic_long_set(&u->inflight, 0);
         INIT_LIST_HEAD(&u->link);
@@ -775,7 +784,7 @@ static struct sock *unix_find_other(struct net *net,
                         goto put_fail;
 
                 if (u->sk_type == type)
-                        touch_atime(path.mnt, path.dentry);
+                        touch_atime(&path);
 
                 path_put(&path);
 
@@ -789,9 +798,9 @@ static struct sock *unix_find_other(struct net *net,
                 u = unix_find_socket_byname(net, sunname, len, type, hash);
                 if (u) {
                         struct dentry *dentry;
-                        dentry = unix_sk(u)->dentry;
+                        dentry = unix_sk(u)->path.dentry;
                         if (dentry)
-                                touch_atime(unix_sk(u)->mnt, dentry);
+                                touch_atime(&unix_sk(u)->path);
                 } else
                         goto fail;
         }
@@ -897,8 +906,7 @@ out_mknod_drop_write:
                 list = &unix_socket_table[addr->hash];
         } else {
                 list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)];
-                u->dentry = path.dentry;
-                u->mnt    = path.mnt;
+                u->path = path;
         }
 
         err = 0;
@@ -1180,9 +1188,9 @@ restart:
                 atomic_inc(&otheru->addr->refcnt);
                 newu->addr = otheru->addr;
         }
-        if (otheru->dentry) {
-                newu->dentry    = dget(otheru->dentry);
-                newu->mnt       = mntget(otheru->mnt);
+        if (otheru->path.dentry) {
+                path_get(&otheru->path);
+                newu->path = otheru->path;
         }
 
         /* Set credentials */
@@ -1756,6 +1764,7 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
         int noblock = flags & MSG_DONTWAIT;
         struct sk_buff *skb;
         int err;
+        int peeked, skip;
 
         err = -EOPNOTSUPP;
         if (flags&MSG_OOB)
@@ -1769,7 +1778,9 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
                 goto out;
         }
 
-        skb = skb_recv_datagram(sk, flags, noblock, &err);
+        skip = sk_peek_offset(sk, flags);
+
+        skb = __skb_recv_datagram(sk, flags, &peeked, &skip, &err);
         if (!skb) {
                 unix_state_lock(sk);
                 /* Signal EOF on disconnected non-blocking SEQPACKET socket. */
@@ -1786,12 +1797,12 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
         if (msg->msg_name)
                 unix_copy_addr(msg, skb->sk);
 
-        if (size > skb->len)
-                size = skb->len;
-        else if (size < skb->len)
+        if (size > skb->len - skip)
+                size = skb->len - skip;
+        else if (size < skb->len - skip)
                 msg->msg_flags |= MSG_TRUNC;
 
-        err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, size);
+        err = skb_copy_datagram_iovec(skb, skip, msg->msg_iov, size);
         if (err)
                 goto out_free;
 
@@ -1808,6 +1819,8 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
         if (!(flags & MSG_PEEK)) {
                 if (UNIXCB(skb).fp)
                         unix_detach_fds(siocb->scm, skb);
+
+                sk_peek_offset_bwd(sk, skb->len);
         } else {
                 /* It is questionable: on PEEK we could:
                    - do not return fds - good, but too simple 8)
@@ -1821,10 +1834,13 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
                    clearly however!
 
                 */
+
+                sk_peek_offset_fwd(sk, size);
+
                 if (UNIXCB(skb).fp)
                         siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
         }
-        err = size;
+        err = (flags & MSG_TRUNC) ? skb->len - skip : size;
 
         scm_recv(sock, msg, siocb->scm, flags);
 
@@ -1884,6 +1900,7 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
         int target;
         int err = 0;
         long timeo;
+        int skip;
 
         err = -EINVAL;
         if (sk->sk_state != TCP_ESTABLISHED)
@@ -1913,12 +1930,15 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
                 goto out;
         }
 
+        skip = sk_peek_offset(sk, flags);
+
         do {
                 int chunk;
                 struct sk_buff *skb;
 
                 unix_state_lock(sk);
-                skb = skb_dequeue(&sk->sk_receive_queue);
+                skb = skb_peek(&sk->sk_receive_queue);
+again:
                 if (skb == NULL) {
                         unix_sk(sk)->recursion_level = 0;
                         if (copied >= target)
@@ -1953,16 +1973,20 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
                         unix_state_unlock(sk);
                         break;
                 }
+
+                if (skip >= skb->len) {
+                        skip -= skb->len;
+                        skb = skb_peek_next(skb, &sk->sk_receive_queue);
+                        goto again;
+                }
+
                 unix_state_unlock(sk);
 
                 if (check_creds) {
                         /* Never glue messages from different writers */
                         if ((UNIXCB(skb).pid  != siocb->scm->pid) ||
-                            (UNIXCB(skb).cred != siocb->scm->cred)) {
-                                skb_queue_head(&sk->sk_receive_queue, skb);
-                                sk->sk_data_ready(sk, skb->len);
+                            (UNIXCB(skb).cred != siocb->scm->cred))
                                 break;
-                        }
                 } else {
                         /* Copy credentials */
                         scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).cred);
@@ -1975,10 +1999,8 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
                         sunaddr = NULL;
                 }
 
-                chunk = min_t(unsigned int, skb->len, size);
-                if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
-                        skb_queue_head(&sk->sk_receive_queue, skb);
-                        sk->sk_data_ready(sk, skb->len);
+                chunk = min_t(unsigned int, skb->len - skip, size);
+                if (memcpy_toiovec(msg->msg_iov, skb->data + skip, chunk)) {
                         if (copied == 0)
                                 copied = -EFAULT;
                         break;
@@ -1990,16 +2012,15 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
                 if (!(flags & MSG_PEEK)) {
                         skb_pull(skb, chunk);
 
+                        sk_peek_offset_bwd(sk, chunk);
+
                         if (UNIXCB(skb).fp)
                                 unix_detach_fds(siocb->scm, skb);
 
-                        /* put the skb back if we didn't use it up.. */
-                        if (skb->len) {
-                                skb_queue_head(&sk->sk_receive_queue, skb);
-                                sk->sk_data_ready(sk, skb->len);
+                        if (skb->len)
                                 break;
-                        }
 
+                        skb_unlink(skb, &sk->sk_receive_queue);
                         consume_skb(skb);
 
                         if (siocb->scm->fp)
@@ -2010,9 +2031,8 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
                         if (UNIXCB(skb).fp)
                                 siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
 
-                        /* put message back and return */
-                        skb_queue_head(&sk->sk_receive_queue, skb);
-                        sk->sk_data_ready(sk, skb->len);
+                        sk_peek_offset_fwd(sk, chunk);
+
                         break;
                 }
         } while (size);
@@ -2186,7 +2206,7 @@ static unsigned int unix_dgram_poll(struct file *file, struct socket *sock,
         }
 
         /* No write status requested, avoid expensive OUT tests. */
-        if (wait && !(wait->key & (POLLWRBAND | POLLWRNORM | POLLOUT)))
+        if (!(poll_requested_events(wait) & (POLLWRBAND|POLLWRNORM|POLLOUT)))
                 return mask;
 
         writable = unix_writable(sk);