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Subject[1/4] kevent: core files.
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This patch includes core kevent files:
- userspace controlling
- kernelspace interfaces
- initialization
- notification state machines

It might also inlclude parts from other subsystem (like network related
syscalls, so it is possible that it will not compile without other
patches applied).

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>

diff --git a/arch/i386/kernel/syscall_table.S b/arch/i386/kernel/syscall_table.S
index af56987..93e23ff 100644
--- a/arch/i386/kernel/syscall_table.S
+++ b/arch/i386/kernel/syscall_table.S
@@ -316,3 +316,7 @@ ENTRY(sys_call_table)
.long sys_sync_file_range
.long sys_tee /* 315 */
.long sys_vmsplice
+ .long sys_aio_recv
+ .long sys_aio_send
+ .long sys_aio_sendfile
+ .long sys_kevent_ctl
diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S
index 5a92fed..534d516 100644
--- a/arch/x86_64/ia32/ia32entry.S
+++ b/arch/x86_64/ia32/ia32entry.S
@@ -696,4 +696,8 @@ #endif
.quad sys_sync_file_range
.quad sys_tee
.quad compat_sys_vmsplice
+ .quad sys_aio_recv
+ .quad sys_aio_send
+ .quad sys_aio_sendfile
+ .quad sys_kevent_ctl
ia32_syscall_end:
diff --git a/include/asm-i386/socket.h b/include/asm-i386/socket.h
index 802ae76..3473f5c 100644
--- a/include/asm-i386/socket.h
+++ b/include/asm-i386/socket.h
@@ -49,4 +49,6 @@ #define SO_ACCEPTCONN 30

#define SO_PEERSEC 31

+#define SO_ASYNC_SOCK 34
+
#endif /* _ASM_SOCKET_H */
diff --git a/include/asm-i386/unistd.h b/include/asm-i386/unistd.h
index de2ccc1..52f8642 100644
--- a/include/asm-i386/unistd.h
+++ b/include/asm-i386/unistd.h
@@ -322,10 +322,14 @@ #define __NR_splice 313
#define __NR_sync_file_range 314
#define __NR_tee 315
#define __NR_vmsplice 316
+#define __NR_aio_recv 317
+#define __NR_aio_send 318
+#define __NR_aio_sendfile 319
+#define __NR_kevent_ctl 320

#ifdef __KERNEL__

-#define NR_syscalls 317
+#define NR_syscalls 321

/*
* user-visible error numbers are in the range -1 - -128: see
diff --git a/include/asm-x86_64/socket.h b/include/asm-x86_64/socket.h
index f2cdbea..1f31f86 100644
--- a/include/asm-x86_64/socket.h
+++ b/include/asm-x86_64/socket.h
@@ -49,4 +49,6 @@ #define SO_ACCEPTCONN 30

#define SO_PEERSEC 31

+#define SO_ASYNC_SOCK 34
+
#endif /* _ASM_SOCKET_H */
diff --git a/include/asm-x86_64/unistd.h b/include/asm-x86_64/unistd.h
index 0aff22b..352c34b 100644
--- a/include/asm-x86_64/unistd.h
+++ b/include/asm-x86_64/unistd.h
@@ -617,11 +617,18 @@ #define __NR_sync_file_range 277
__SYSCALL(__NR_sync_file_range, sys_sync_file_range)
#define __NR_vmsplice 278
__SYSCALL(__NR_vmsplice, sys_vmsplice)
+#define __NR_aio_recv 279
+__SYSCALL(__NR_aio_recv, sys_aio_recv)
+#define __NR_aio_send 280
+__SYSCALL(__NR_aio_send, sys_aio_send)
+#define __NR_aio_sendfile 281
+__SYSCALL(__NR_aio_sendfile, sys_aio_sendfile)
+#define __NR_kevent_ctl 282
+__SYSCALL(__NR_kevent_ctl, sys_kevent_ctl)

#ifdef __KERNEL__

-#define __NR_syscall_max __NR_vmsplice
-
+#define __NR_syscall_max __NR_kevent_ctl
#ifndef __NO_STUBS

/* user-visible error numbers are in the range -1 - -4095 */
diff --git a/include/linux/kevent.h b/include/linux/kevent.h
new file mode 100644
index 0000000..e94a7bf
--- /dev/null
+++ b/include/linux/kevent.h
@@ -0,0 +1,263 @@
+/*
+ * kevent.h
+ *
+ * 2006 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __KEVENT_H
+#define __KEVENT_H
+
+/*
+ * Kevent request flags.
+ */
+
+#define KEVENT_REQ_ONESHOT 0x1 /* Process this event only once and then dequeue. */
+
+/*
+ * Kevent return flags.
+ */
+#define KEVENT_RET_BROKEN 0x1 /* Kevent is broken. */
+#define KEVENT_RET_DONE 0x2 /* Kevent processing was finished successfully. */
+
+/*
+ * Kevent type set.
+ */
+#define KEVENT_SOCKET 0
+#define KEVENT_INODE 1
+#define KEVENT_TIMER 2
+#define KEVENT_POLL 3
+#define KEVENT_NAIO 4
+#define KEVENT_AIO 5
+#define KEVENT_MAX 6
+
+/*
+ * Per-type event sets.
+ * Number of per-event sets should be exactly as number of kevent types.
+ */
+
+/*
+ * Timer events.
+ */
+#define KEVENT_TIMER_FIRED 0x1
+
+/*
+ * Socket/network asynchronous IO events.
+ */
+#define KEVENT_SOCKET_RECV 0x1
+#define KEVENT_SOCKET_ACCEPT 0x2
+#define KEVENT_SOCKET_SEND 0x4
+
+/*
+ * Inode events.
+ */
+#define KEVENT_INODE_CREATE 0x1
+#define KEVENT_INODE_REMOVE 0x2
+
+/*
+ * Poll events.
+ */
+#define KEVENT_POLL_POLLIN 0x0001
+#define KEVENT_POLL_POLLPRI 0x0002
+#define KEVENT_POLL_POLLOUT 0x0004
+#define KEVENT_POLL_POLLERR 0x0008
+#define KEVENT_POLL_POLLHUP 0x0010
+#define KEVENT_POLL_POLLNVAL 0x0020
+
+#define KEVENT_POLL_POLLRDNORM 0x0040
+#define KEVENT_POLL_POLLRDBAND 0x0080
+#define KEVENT_POLL_POLLWRNORM 0x0100
+#define KEVENT_POLL_POLLWRBAND 0x0200
+#define KEVENT_POLL_POLLMSG 0x0400
+#define KEVENT_POLL_POLLREMOVE 0x1000
+
+/*
+ * Asynchronous IO events.
+ */
+#define KEVENT_AIO_BIO 0x1
+
+#define KEVENT_MASK_ALL 0xffffffff /* Mask of all possible event values. */
+#define KEVENT_MASK_EMPTY 0x0 /* Empty mask of ready events. */
+
+struct kevent_id
+{
+ __u32 raw[2];
+};
+
+struct ukevent
+{
+ struct kevent_id id; /* Id of this request, e.g. socket number, file descriptor and so on... */
+ __u32 type; /* Event type, e.g. KEVENT_SOCK, KEVENT_INODE, KEVENT_TIMER and so on... */
+ __u32 event; /* Event itself, e.g. SOCK_ACCEPT, INODE_CREATED, TIMER_FIRED... */
+ __u32 req_flags; /* Per-event request flags */
+ __u32 ret_flags; /* Per-event return flags */
+ __u32 ret_data[2]; /* Event return data. Event originator fills it with anything it likes. */
+ union {
+ __u32 user[2]; /* User's data. It is not used, just copied to/from user. */
+ void *ptr;
+ };
+};
+
+#define KEVENT_CTL_ADD 0
+#define KEVENT_CTL_REMOVE 1
+#define KEVENT_CTL_MODIFY 2
+#define KEVENT_CTL_WAIT 3
+#define KEVENT_CTL_INIT 4
+
+struct kevent_user_control
+{
+ unsigned int cmd; /* Control command, e.g. KEVENT_ADD, KEVENT_REMOVE... */
+ unsigned int num; /* Number of ukevents this strucutre controls. */
+ unsigned int timeout; /* Timeout in milliseconds waiting for "num" events to become ready. */
+};
+
+#define KEVENT_USER_SYMBOL 'K'
+#define KEVENT_USER_CTL _IOWR(KEVENT_USER_SYMBOL, 0, struct kevent_user_control)
+#define KEVENT_USER_WAIT _IOWR(KEVENT_USER_SYMBOL, 1, struct kevent_user_control)
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/kevent_storage.h>
+#include <asm/semaphore.h>
+
+struct inode;
+struct dentry;
+struct sock;
+
+struct kevent;
+struct kevent_storage;
+typedef int (* kevent_callback_t)(struct kevent *);
+
+struct kevent
+{
+ struct ukevent event;
+ spinlock_t lock; /* This lock protects ukevent manipulations, e.g. ret_flags changes. */
+
+ struct list_head kevent_entry; /* Entry of user's queue. */
+ struct list_head storage_entry; /* Entry of origin's queue. */
+ struct list_head ready_entry; /* Entry of user's ready. */
+
+ struct kevent_user *user; /* User who requested this kevent. */
+ struct kevent_storage *st; /* Kevent container. */
+
+ kevent_callback_t callback; /* Is called each time new event has been caught. */
+ kevent_callback_t enqueue; /* Is called each time new event is queued. */
+ kevent_callback_t dequeue; /* Is called each time event is dequeued. */
+
+ void *priv; /* Private data for different storages.
+ * poll()/select storage has a list of wait_queue_t containers
+ * for each ->poll() { poll_wait()' } here.
+ */
+};
+
+#define KEVENT_HASH_MASK 0xff
+
+struct kevent_list
+{
+ struct list_head kevent_list; /* List of all kevents. */
+ spinlock_t kevent_lock; /* Protects all manipulations with queue of kevents. */
+};
+
+struct kevent_user
+{
+ struct kevent_list kqueue[KEVENT_HASH_MASK+1];
+ unsigned int kevent_num; /* Number of queued kevents. */
+
+ struct list_head ready_list; /* List of ready kevents. */
+ unsigned int ready_num; /* Number of ready kevents. */
+ spinlock_t ready_lock; /* Protects all manipulations with ready queue. */
+
+ unsigned int max_ready_num; /* Requested number of kevents. */
+
+ struct semaphore ctl_mutex; /* Protects against simultaneous kevent_user control manipulations. */
+ struct semaphore wait_mutex; /* Protects against simultaneous kevent_user waits. */
+ wait_queue_head_t wait; /* Wait until some events are ready. */
+
+ atomic_t refcnt; /* Reference counter, increased for each new kevent. */
+#ifdef CONFIG_KEVENT_USER_STAT
+ unsigned long im_num;
+ unsigned long wait_num;
+ unsigned long total;
+#endif
+};
+
+#define KEVENT_MAX_REQUESTS PAGE_SIZE/sizeof(struct kevent)
+
+struct kevent *kevent_alloc(gfp_t mask);
+void kevent_free(struct kevent *k);
+int kevent_enqueue(struct kevent *k);
+int kevent_dequeue(struct kevent *k);
+int kevent_init(struct kevent *k);
+void kevent_requeue(struct kevent *k);
+
+#define list_for_each_entry_reverse_safe(pos, n, head, member) \
+ for (pos = list_entry((head)->prev, typeof(*pos), member), \
+ n = list_entry(pos->member.prev, typeof(*pos), member); \
+ prefetch(pos->member.prev), &pos->member != (head); \
+ pos = n, n = list_entry(pos->member.prev, typeof(*pos), member))
+
+int kevent_break(struct kevent *k);
+int kevent_init(struct kevent *k);
+
+int kevent_init_socket(struct kevent *k);
+int kevent_init_inode(struct kevent *k);
+int kevent_init_timer(struct kevent *k);
+int kevent_init_poll(struct kevent *k);
+int kevent_init_naio(struct kevent *k);
+int kevent_init_aio(struct kevent *k);
+
+void kevent_storage_ready(struct kevent_storage *st,
+ kevent_callback_t ready_callback, u32 event);
+int kevent_storage_init(void *origin, struct kevent_storage *st);
+void kevent_storage_fini(struct kevent_storage *st);
+int kevent_storage_enqueue(struct kevent_storage *st, struct kevent *k);
+void kevent_storage_dequeue(struct kevent_storage *st, struct kevent *k);
+
+int kevent_user_add_ukevent(struct ukevent *uk, struct kevent_user *u);
+
+#ifdef CONFIG_KEVENT_INODE
+void kevent_inode_notify(struct inode *inode, u32 event);
+void kevent_inode_notify_parent(struct dentry *dentry, u32 event);
+void kevent_inode_remove(struct inode *inode);
+#else
+static inline void kevent_inode_notify(struct inode *inode, u32 event)
+{
+}
+static inline void kevent_inode_notify_parent(struct dentry *dentry, u32 event)
+{
+}
+static inline void kevent_inode_remove(struct inode *inode)
+{
+}
+#endif /* CONFIG_KEVENT_INODE */
+#ifdef CONFIG_KEVENT_SOCKET
+
+void kevent_socket_notify(struct sock *sock, u32 event);
+int kevent_socket_dequeue(struct kevent *k);
+int kevent_socket_enqueue(struct kevent *k);
+#define sock_async(__sk) sock_flag(__sk, SOCK_ASYNC)
+#else
+static inline void kevent_socket_notify(struct sock *sock, u32 event)
+{
+}
+#define sock_async(__sk) 0
+#endif
+#endif /* __KERNEL__ */
+#endif /* __KEVENT_H */
diff --git a/include/linux/kevent_storage.h b/include/linux/kevent_storage.h
new file mode 100644
index 0000000..bd891f0
--- /dev/null
+++ b/include/linux/kevent_storage.h
@@ -0,0 +1,12 @@
+#ifndef __KEVENT_STORAGE_H
+#define __KEVENT_STORAGE_H
+
+struct kevent_storage
+{
+ void *origin; /* Originator's pointer, e.g. struct sock or struct file. Can be NULL. */
+ struct list_head list; /* List of queued kevents. */
+ unsigned int qlen; /* Number of queued kevents. */
+ spinlock_t lock; /* Protects users queue. */
+};
+
+#endif /* __KEVENT_STORAGE_H */
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 66f8819..ea914c3 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1269,6 +1269,8 @@ extern struct sk_buff *skb_recv_datagram
int noblock, int *err);
extern unsigned int datagram_poll(struct file *file, struct socket *sock,
struct poll_table_struct *wait);
+extern int skb_copy_datagram(const struct sk_buff *from,
+ int offset, void *dst, int size);
extern int skb_copy_datagram_iovec(const struct sk_buff *from,
int offset, struct iovec *to,
int size);
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index bd67a44..33d436e 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -587,4 +587,8 @@ asmlinkage long sys_get_robust_list(int
asmlinkage long sys_set_robust_list(struct robust_list_head __user *head,
size_t len);

+asmlinkage long sys_aio_recv(int ctl_fd, int s, void __user *buf, size_t size, unsigned flags);
+asmlinkage long sys_aio_send(int ctl_fd, int s, void __user *buf, size_t size, unsigned flags);
+asmlinkage long sys_aio_sendfile(int ctl_fd, int fd, int s, size_t size, unsigned flags);
+asmlinkage long sys_kevent_ctl(int ctl_fd, void __user *buf);
#endif
diff --git a/include/net/sock.h b/include/net/sock.h
index d10dfec..7a2bee3 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -47,6 +47,7 @@ #include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h> /* struct sk_buff */
#include <linux/security.h>
+#include <linux/kevent.h>

#include <linux/filter.h>

@@ -386,6 +387,8 @@ enum sock_flags {
SOCK_NO_LARGESEND, /* whether to sent large segments or not */
SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
+ SOCK_ASYNC,
+ SOCK_ASYNC_INUSE,
};

static inline void sock_copy_flags(struct sock *nsk, struct sock *osk)
@@ -445,6 +448,21 @@ static inline int sk_stream_memory_free(

extern void sk_stream_rfree(struct sk_buff *skb);

+struct socket_alloc {
+ struct socket socket;
+ struct inode vfs_inode;
+};
+
+static inline struct socket *SOCKET_I(struct inode *inode)
+{
+ return &container_of(inode, struct socket_alloc, vfs_inode)->socket;
+}
+
+static inline struct inode *SOCK_INODE(struct socket *socket)
+{
+ return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
+}
+
static inline void sk_stream_set_owner_r(struct sk_buff *skb, struct sock *sk)
{
skb->sk = sk;
@@ -472,6 +490,7 @@ static inline void sk_add_backlog(struct
sk->sk_backlog.tail = skb;
}
skb->next = NULL;
+ kevent_socket_notify(sk, KEVENT_SOCKET_RECV);
}

#define sk_wait_event(__sk, __timeo, __condition) \
@@ -543,6 +562,12 @@ struct proto {

int (*backlog_rcv) (struct sock *sk,
struct sk_buff *skb);
+
+ int (*async_recv) (struct sock *sk,
+ void *dst, size_t size);
+ int (*async_send) (struct sock *sk,
+ struct page **pages, unsigned int poffset,
+ size_t size);

/* Keeping track of sk's, looking them up, and port selection methods. */
void (*hash)(struct sock *sk);
@@ -674,21 +699,6 @@ static inline struct kiocb *siocb_to_kio
return si->kiocb;
}

-struct socket_alloc {
- struct socket socket;
- struct inode vfs_inode;
-};
-
-static inline struct socket *SOCKET_I(struct inode *inode)
-{
- return &container_of(inode, struct socket_alloc, vfs_inode)->socket;
-}
-
-static inline struct inode *SOCK_INODE(struct socket *socket)
-{
- return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
-}
-
extern void __sk_stream_mem_reclaim(struct sock *sk);
extern int sk_stream_mem_schedule(struct sock *sk, int size, int kind);

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5f4eb5c..820cd5a 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -364,6 +364,8 @@ extern int compat_tcp_setsockopt(struc
int level, int optname,
char __user *optval, int optlen);
extern void tcp_set_keepalive(struct sock *sk, int val);
+extern int tcp_async_recv(struct sock *sk, void *dst, size_t size);
+extern int tcp_async_send(struct sock *sk, struct page **pages, unsigned int poffset, size_t size);
extern int tcp_recvmsg(struct kiocb *iocb, struct sock *sk,
struct msghdr *msg,
size_t len, int nonblock,
@@ -857,6 +859,7 @@ static inline int tcp_prequeue(struct so
tp->ucopy.memory = 0;
} else if (skb_queue_len(&tp->ucopy.prequeue) == 1) {
wake_up_interruptible(sk->sk_sleep);
+ kevent_socket_notify(sk, KEVENT_SOCKET_RECV|KEVENT_SOCKET_SEND);
if (!inet_csk_ack_scheduled(sk))
inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
(3 * TCP_RTO_MIN) / 4,
diff --git a/init/Kconfig b/init/Kconfig
index df864a3..6135afc 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -185,6 +185,8 @@ config AUDITSYSCALL
such as SELinux. To use audit's filesystem watch feature, please
ensure that INOTIFY is configured.

+source "kernel/kevent/Kconfig"
+
config IKCONFIG
bool "Kernel .config support"
---help---
diff --git a/kernel/Makefile b/kernel/Makefile
index f6ef00f..eb057ea 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_DETECT_SOFTLOCKUP) += softl
obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
obj-$(CONFIG_SECCOMP) += seccomp.o
obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
+obj-$(CONFIG_KEVENT) += kevent/
obj-$(CONFIG_RELAY) += relay.o

ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)
diff --git a/kernel/kevent/Kconfig b/kernel/kevent/Kconfig
new file mode 100644
index 0000000..88b35af
--- /dev/null
+++ b/kernel/kevent/Kconfig
@@ -0,0 +1,57 @@
+config KEVENT
+ bool "Kernel event notification mechanism"
+ help
+ This option enables event queue mechanism.
+ It can be used as replacement for poll()/select(), AIO callback invocations,
+ advanced timer notifications and other kernel object status changes.
+
+config KEVENT_USER_STAT
+ bool "Kevent user statistic"
+ depends on KEVENT
+ default N
+ help
+ This option will turn kevent_user statistic collection on.
+ Statistic data includes total number of kevent, number of kevents which are ready
+ immediately at insertion time and number of kevents which were removed through
+ readiness completion. It will be printed each time control kevent descriptor
+ is closed.
+
+config KEVENT_SOCKET
+ bool "Kernel event notifications for sockets"
+ depends on NET && KEVENT
+ help
+ This option enables notifications through KEVENT subsystem of
+ sockets operations, like new packet receiving conditions, ready for accept
+ conditions and so on.
+
+config KEVENT_INODE
+ bool "Kernel event notifications for inodes"
+ depends on KEVENT
+ help
+ This option enables notifications through KEVENT subsystem of
+ inode operations, like file creation, removal and so on.
+
+config KEVENT_TIMER
+ bool "Kernel event notifications for timers"
+ depends on KEVENT
+ help
+ This option allows to use timers through KEVENT subsystem.
+
+config KEVENT_POLL
+ bool "Kernel event notifications for poll()/select()"
+ depends on KEVENT
+ help
+ This option allows to use kevent subsystem for poll()/select() notifications.
+
+config KEVENT_NAIO
+ bool "Network asynchronous IO"
+ depends on KEVENT && KEVENT_SOCKET
+ help
+ This option enables kevent based network asynchronous IO subsystem.
+
+config KEVENT_AIO
+ bool "Asynchronous IO"
+ depends on KEVENT
+ help
+ This option allows to use kevent subsystem for AIO operations.
+ AIO read is currently supported.
diff --git a/kernel/kevent/Makefile b/kernel/kevent/Makefile
new file mode 100644
index 0000000..7dcd651
--- /dev/null
+++ b/kernel/kevent/Makefile
@@ -0,0 +1,7 @@
+obj-y := kevent.o kevent_user.o kevent_init.o
+obj-$(CONFIG_KEVENT_SOCKET) += kevent_socket.o
+obj-$(CONFIG_KEVENT_INODE) += kevent_inode.o
+obj-$(CONFIG_KEVENT_TIMER) += kevent_timer.o
+obj-$(CONFIG_KEVENT_POLL) += kevent_poll.o
+obj-$(CONFIG_KEVENT_NAIO) += kevent_naio.o
+obj-$(CONFIG_KEVENT_AIO) += kevent_aio.o
diff --git a/kernel/kevent/kevent.c b/kernel/kevent/kevent.c
new file mode 100644
index 0000000..f699a13
--- /dev/null
+++ b/kernel/kevent/kevent.c
@@ -0,0 +1,260 @@
+/*
+ * kevent.c
+ *
+ * 2006 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/mempool.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/kevent.h>
+
+static kmem_cache_t *kevent_cache;
+
+/*
+ * Attempts to add an event into appropriate origin's queue.
+ * Returns positive value if this event is ready immediately,
+ * negative value in case of error and zero if event has been queued.
+ * ->enqueue() callback must increase origin's reference counter.
+ */
+int kevent_enqueue(struct kevent *k)
+{
+ if (k->event.type >= KEVENT_MAX)
+ return -E2BIG;
+
+ if (!k->enqueue) {
+ kevent_break(k);
+ return -EINVAL;
+ }
+
+ return k->enqueue(k);
+}
+
+/*
+ * Remove event from the appropriate queue.
+ * ->dequeue() callback must decrease origin's reference counter.
+ */
+int kevent_dequeue(struct kevent *k)
+{
+ if (k->event.type >= KEVENT_MAX)
+ return -E2BIG;
+
+ if (!k->dequeue) {
+ kevent_break(k);
+ return -EINVAL;
+ }
+
+ return k->dequeue(k);
+}
+
+/*
+ * Must be called before event is going to be added into some origin's queue.
+ * Initializes ->enqueue(), ->dequeue() and ->callback() callbacks.
+ * If failed, kevent should not be used or kevent_enqueue() will fail to add
+ * this kevent into origin's queue with setting
+ * KEVENT_RET_BROKEN flag in kevent->event.ret_flags.
+ */
+int kevent_init(struct kevent *k)
+{
+ int err;
+
+ spin_lock_init(&k->lock);
+ k->kevent_entry.next = LIST_POISON1;
+ k->storage_entry.next = LIST_POISON1;
+ k->ready_entry.next = LIST_POISON1;
+
+ if (k->event.type >= KEVENT_MAX)
+ return -E2BIG;
+
+ switch (k->event.type) {
+ case KEVENT_NAIO:
+ err = kevent_init_naio(k);
+ break;
+ case KEVENT_SOCKET:
+ err = kevent_init_socket(k);
+ break;
+ case KEVENT_INODE:
+ err = kevent_init_inode(k);
+ break;
+ case KEVENT_TIMER:
+ err = kevent_init_timer(k);
+ break;
+ case KEVENT_POLL:
+ err = kevent_init_poll(k);
+ break;
+ case KEVENT_AIO:
+ err = kevent_init_aio(k);
+ break;
+ default:
+ err = -ENODEV;
+ }
+
+ return err;
+}
+
+/*
+ * Called from ->enqueue() callback when reference counter for given
+ * origin (socket, inode...) has been increased.
+ */
+int kevent_storage_enqueue(struct kevent_storage *st, struct kevent *k)
+{
+ unsigned long flags;
+
+ k->st = st;
+ spin_lock_irqsave(&st->lock, flags);
+ list_add_tail(&k->storage_entry, &st->list);
+ st->qlen++;
+ spin_unlock_irqrestore(&st->lock, flags);
+ return 0;
+}
+
+/*
+ * Dequeue kevent from origin's queue.
+ * It does not decrease origin's reference counter in any way
+ * and must be called before it, so storage itself must be valid.
+ * It is called from ->dequeue() callback.
+ */
+void kevent_storage_dequeue(struct kevent_storage *st, struct kevent *k)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&st->lock, flags);
+ if (k->storage_entry.next != LIST_POISON1) {
+ list_del(&k->storage_entry);
+ st->qlen--;
+ }
+ spin_unlock_irqrestore(&st->lock, flags);
+}
+
+static void __kevent_requeue(struct kevent *k, u32 event)
+{
+ int err, rem = 0;
+ unsigned long flags;
+
+ err = k->callback(k);
+
+ spin_lock_irqsave(&k->lock, flags);
+ if (err > 0) {
+ k->event.ret_flags |= KEVENT_RET_DONE;
+ } else if (err < 0) {
+ k->event.ret_flags |= KEVENT_RET_BROKEN;
+ k->event.ret_flags |= KEVENT_RET_DONE;
+ }
+ rem = (k->event.req_flags & KEVENT_REQ_ONESHOT);
+ if (!err)
+ err = (k->event.ret_flags & (KEVENT_RET_BROKEN|KEVENT_RET_DONE));
+ spin_unlock_irqrestore(&k->lock, flags);
+
+ if (err) {
+ if (rem) {
+ list_del(&k->storage_entry);
+ k->st->qlen--;
+ }
+
+ spin_lock_irqsave(&k->user->ready_lock, flags);
+ if (k->ready_entry.next == LIST_POISON1) {
+ list_add_tail(&k->ready_entry, &k->user->ready_list);
+ k->user->ready_num++;
+ }
+ spin_unlock_irqrestore(&k->user->ready_lock, flags);
+ wake_up(&k->user->wait);
+ }
+}
+
+void kevent_requeue(struct kevent *k)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&k->st->lock, flags);
+ __kevent_requeue(k, 0);
+ spin_unlock_irqrestore(&k->st->lock, flags);
+}
+
+/*
+ * Called each time some activity in origin (socket, inode...) is noticed.
+ */
+void kevent_storage_ready(struct kevent_storage *st,
+ kevent_callback_t ready_callback, u32 event)
+{
+ struct kevent *k, *n;
+
+ spin_lock(&st->lock);
+ list_for_each_entry_safe(k, n, &st->list, storage_entry) {
+ if (ready_callback)
+ ready_callback(k);
+
+ if (event & k->event.event)
+ __kevent_requeue(k, event);
+ }
+ spin_unlock(&st->lock);
+}
+
+int kevent_storage_init(void *origin, struct kevent_storage *st)
+{
+ spin_lock_init(&st->lock);
+ st->origin = origin;
+ st->qlen = 0;
+ INIT_LIST_HEAD(&st->list);
+ return 0;
+}
+
+void kevent_storage_fini(struct kevent_storage *st)
+{
+ kevent_storage_ready(st, kevent_break, KEVENT_MASK_ALL);
+}
+
+struct kevent *kevent_alloc(gfp_t mask)
+{
+ struct kevent *k;
+
+ if (kevent_cache)
+ k = kmem_cache_alloc(kevent_cache, mask);
+ else
+ k = kzalloc(sizeof(struct kevent), mask);
+
+ return k;
+}
+
+void kevent_free(struct kevent *k)
+{
+ memset(k, 0xab, sizeof(struct kevent));
+
+ if (kevent_cache)
+ kmem_cache_free(kevent_cache, k);
+ else
+ kfree(k);
+}
+
+int __init kevent_sys_init(void)
+{
+ int err = 0;
+
+ kevent_cache = kmem_cache_create("kevent_cache",
+ sizeof(struct kevent), 0, 0, NULL, NULL);
+ if (!kevent_cache)
+ err = -ENOMEM;
+
+ return err;
+}
+
+late_initcall(kevent_sys_init);
diff --git a/kernel/kevent/kevent_init.c b/kernel/kevent/kevent_init.c
new file mode 100644
index 0000000..ec95114
--- /dev/null
+++ b/kernel/kevent/kevent_init.c
@@ -0,0 +1,85 @@
+/*
+ * kevent_init.c
+ *
+ * 2006 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/kevent.h>
+
+int kevent_break(struct kevent *k)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&k->lock, flags);
+ k->event.ret_flags |= KEVENT_RET_BROKEN;
+ spin_unlock_irqrestore(&k->lock, flags);
+ return 0;
+}
+
+#ifndef CONFIG_KEVENT_SOCKET
+int kevent_init_socket(struct kevent *k)
+{
+ kevent_break(k);
+ return -ENODEV;
+}
+#endif
+
+#ifndef CONFIG_KEVENT_INODE
+int kevent_init_inode(struct kevent *k)
+{
+ kevent_break(k);
+ return -ENODEV;
+}
+#endif
+
+#ifndef CONFIG_KEVENT_TIMER
+int kevent_init_timer(struct kevent *k)
+{
+ kevent_break(k);
+ return -ENODEV;
+}
+#endif
+
+#ifndef CONFIG_KEVENT_POLL
+int kevent_init_poll(struct kevent *k)
+{
+ kevent_break(k);
+ return -ENODEV;
+}
+#endif
+
+#ifndef CONFIG_KEVENT_NAIO
+int kevent_init_naio(struct kevent *k)
+{
+ kevent_break(k);
+ return -ENODEV;
+}
+#endif
+
+#ifndef CONFIG_KEVENT_AIO
+int kevent_init_aio(struct kevent *k)
+{
+ kevent_break(k);
+ return -ENODEV;
+}
+#endif
diff --git a/kernel/kevent/kevent_user.c b/kernel/kevent/kevent_user.c
new file mode 100644
index 0000000..2f71fe4
--- /dev/null
+++ b/kernel/kevent/kevent_user.c
@@ -0,0 +1,728 @@
+/*
+ * kevent_user.c
+ *
+ * 2006 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/mount.h>
+#include <linux/device.h>
+#include <linux/poll.h>
+#include <linux/kevent.h>
+#include <linux/jhash.h>
+#include <asm/uaccess.h>
+#include <asm/semaphore.h>
+
+static struct class *kevent_user_class;
+static char kevent_name[] = "kevent";
+static int kevent_user_major;
+
+static int kevent_user_open(struct inode *, struct file *);
+static int kevent_user_release(struct inode *, struct file *);
+static int kevent_user_ioctl(struct inode *, struct file *,
+ unsigned int, unsigned long);
+static unsigned int kevent_user_poll(struct file *, struct poll_table_struct *);
+
+static struct file_operations kevent_user_fops = {
+ .open = kevent_user_open,
+ .release = kevent_user_release,
+ .ioctl = kevent_user_ioctl,
+ .poll = kevent_user_poll,
+ .owner = THIS_MODULE,
+};
+
+static struct super_block *kevent_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ /* So original magic... */
+ return get_sb_pseudo(fs_type, kevent_name, NULL, 0xabcdef);
+}
+
+static struct file_system_type kevent_fs_type = {
+ .name = kevent_name,
+ .get_sb = kevent_get_sb,
+ .kill_sb = kill_anon_super,
+};
+
+static struct vfsmount *kevent_mnt;
+
+static unsigned int kevent_user_poll(struct file *file, struct poll_table_struct *wait)
+{
+ struct kevent_user *u = file->private_data;
+ unsigned int mask;
+
+ poll_wait(file, &u->wait, wait);
+ mask = 0;
+
+ if (u->ready_num)
+ mask |= POLLIN | POLLRDNORM;
+
+ return mask;
+}
+
+static struct kevent_user *kevent_user_alloc(void)
+{
+ struct kevent_user *u;
+ int i;
+
+ u = kzalloc(sizeof(struct kevent_user), GFP_KERNEL);
+ if (!u)
+ return NULL;
+
+ INIT_LIST_HEAD(&u->ready_list);
+ spin_lock_init(&u->ready_lock);
+ u->ready_num = 0;
+#ifdef CONFIG_KEVENT_USER_STAT
+ u->wait_num = u->im_num = u->total = 0;
+#endif
+ for (i=0; i<KEVENT_HASH_MASK+1; ++i) {
+ INIT_LIST_HEAD(&u->kqueue[i].kevent_list);
+ spin_lock_init(&u->kqueue[i].kevent_lock);
+ }
+ u->kevent_num = 0;
+
+ init_MUTEX(&u->ctl_mutex);
+ init_MUTEX(&u->wait_mutex);
+ init_waitqueue_head(&u->wait);
+ u->max_ready_num = 0;
+
+ atomic_set(&u->refcnt, 1);
+
+ return u;
+}
+
+static int kevent_user_open(struct inode *inode, struct file *file)
+{
+ struct kevent_user *u = kevent_user_alloc();
+
+ if (!u)
+ return -ENOMEM;
+
+ file->private_data = u;
+
+ return 0;
+}
+
+static inline void kevent_user_get(struct kevent_user *u)
+{
+ atomic_inc(&u->refcnt);
+}
+
+static inline void kevent_user_put(struct kevent_user *u)
+{
+ if (atomic_dec_and_test(&u->refcnt)) {
+#ifdef CONFIG_KEVENT_USER_STAT
+ printk("%s: u=%p, wait=%lu, immediately=%lu, total=%lu.\n",
+ __func__, u, u->wait_num, u->im_num, u->total);
+#endif
+ kfree(u);
+ }
+}
+
+#if 0
+static inline unsigned int kevent_user_hash(struct ukevent *uk)
+{
+ unsigned int h = (uk->user[0] ^ uk->user[1]) ^ (uk->id.raw[0] ^ uk->id.raw[1]);
+
+ h = (((h >> 16) & 0xffff) ^ (h & 0xffff)) & 0xffff;
+ h = (((h >> 8) & 0xff) ^ (h & 0xff)) & KEVENT_HASH_MASK;
+
+ return h;
+}
+#else
+static inline unsigned int kevent_user_hash(struct ukevent *uk)
+{
+ return jhash_1word(uk->id.raw[0], 0) & KEVENT_HASH_MASK;
+}
+#endif
+
+/*
+ * Remove kevent from user's list of all events,
+ * dequeue it from storage and decrease user's reference counter,
+ * since this kevent does not exist anymore. That is why it is freed here.
+ */
+static void kevent_finish_user(struct kevent *k, int lock, int deq)
+{
+ struct kevent_user *u = k->user;
+ unsigned long flags;
+
+ if (lock) {
+ unsigned int hash = kevent_user_hash(&k->event);
+ struct kevent_list *l = &u->kqueue[hash];
+
+ spin_lock_irqsave(&l->kevent_lock, flags);
+ list_del(&k->kevent_entry);
+ u->kevent_num--;
+ spin_unlock_irqrestore(&l->kevent_lock, flags);
+ } else {
+ list_del(&k->kevent_entry);
+ u->kevent_num--;
+ }
+
+ if (deq)
+ kevent_dequeue(k);
+
+ spin_lock_irqsave(&u->ready_lock, flags);
+ if (k->ready_entry.next != LIST_POISON1) {
+ list_del(&k->ready_entry);
+ u->ready_num--;
+ }
+ spin_unlock_irqrestore(&u->ready_lock, flags);
+
+ kevent_user_put(u);
+ kevent_free(k);
+}
+
+/*
+ * Dequeue one entry from user's ready queue.
+ */
+static struct kevent *__kqueue_dequeue_one_ready(struct list_head *q,
+ unsigned int *qlen)
+{
+ struct kevent *k = NULL;
+ unsigned int len = *qlen;
+
+ if (len && !list_empty(q)) {
+ k = list_entry(q->next, struct kevent, ready_entry);
+ list_del(&k->ready_entry);
+ *qlen = len - 1;
+ }
+
+ return k;
+}
+
+static struct kevent *kqueue_dequeue_ready(struct kevent_user *u)
+{
+ unsigned long flags;
+ struct kevent *k;
+
+ spin_lock_irqsave(&u->ready_lock, flags);
+ k = __kqueue_dequeue_one_ready(&u->ready_list, &u->ready_num);
+ spin_unlock_irqrestore(&u->ready_lock, flags);
+
+ return k;
+}
+
+static struct kevent *__kevent_search(struct kevent_list *l, struct ukevent *uk,
+ struct kevent_user *u)
+{
+ struct kevent *k;
+ int found = 0;
+
+ list_for_each_entry(k, &l->kevent_list, kevent_entry) {
+ spin_lock(&k->lock);
+ if (k->event.user[0] == uk->user[0] && k->event.user[1] == uk->user[1] &&
+ k->event.id.raw[0] == uk->id.raw[0] &&
+ k->event.id.raw[1] == uk->id.raw[1]) {
+ found = 1;
+ spin_unlock(&k->lock);
+ break;
+ }
+ spin_unlock(&k->lock);
+ }
+
+ return (found)?k:NULL;
+}
+
+static int kevent_modify(struct ukevent *uk, struct kevent_user *u)
+{
+ struct kevent *k;
+ unsigned int hash = kevent_user_hash(uk);
+ struct kevent_list *l = &u->kqueue[hash];
+ int err = -ENODEV;
+ unsigned long flags;
+
+ spin_lock_irqsave(&l->kevent_lock, flags);
+ k = __kevent_search(l, uk, u);
+ if (k) {
+ spin_lock(&k->lock);
+ k->event.event = uk->event;
+ k->event.req_flags = uk->req_flags;
+ k->event.ret_flags = 0;
+ spin_unlock(&k->lock);
+ kevent_requeue(k);
+ err = 0;
+ }
+ spin_unlock_irqrestore(&l->kevent_lock, flags);
+
+ return err;
+}
+
+static int kevent_remove(struct ukevent *uk, struct kevent_user *u)
+{
+ int err = -ENODEV;
+ struct kevent *k;
+ unsigned int hash = kevent_user_hash(uk);
+ struct kevent_list *l = &u->kqueue[hash];
+ unsigned long flags;
+
+ spin_lock_irqsave(&l->kevent_lock, flags);
+ k = __kevent_search(l, uk, u);
+ if (k) {
+ kevent_finish_user(k, 0, 1);
+ err = 0;
+ }
+ spin_unlock_irqrestore(&l->kevent_lock, flags);
+
+ return err;
+}
+
+/*
+ * No new entry can be added or removed from any list at this point.
+ * It is not permitted to call ->ioctl() and ->release() in parallel.
+ */
+static int kevent_user_release(struct inode *inode, struct file *file)
+{
+ struct kevent_user *u = file->private_data;
+ struct kevent *k, *n;
+ int i;
+
+ for (i=0; i<KEVENT_HASH_MASK+1; ++i) {
+ struct kevent_list *l = &u->kqueue[i];
+
+ list_for_each_entry_safe(k, n, &l->kevent_list, kevent_entry)
+ kevent_finish_user(k, 1, 1);
+ }
+
+ kevent_user_put(u);
+ file->private_data = NULL;
+
+ return 0;
+}
+
+static int kevent_user_ctl_modify(struct kevent_user *u,
+ struct kevent_user_control *ctl, void __user *arg)
+{
+ int err = 0, i;
+ struct ukevent uk;
+
+ if (down_interruptible(&u->ctl_mutex))
+ return -ERESTARTSYS;
+
+ for (i=0; i<ctl->num; ++i) {
+ if (copy_from_user(&uk, arg, sizeof(struct ukevent))) {
+ err = -EINVAL;
+ break;
+ }
+
+ if (kevent_modify(&uk, u))
+ uk.ret_flags |= KEVENT_RET_BROKEN;
+ uk.ret_flags |= KEVENT_RET_DONE;
+
+ if (copy_to_user(arg, &uk, sizeof(struct ukevent))) {
+ err = -EINVAL;
+ break;
+ }
+
+ arg += sizeof(struct ukevent);
+ }
+
+ up(&u->ctl_mutex);
+
+ return err;
+}
+
+static int kevent_user_ctl_remove(struct kevent_user *u,
+ struct kevent_user_control *ctl, void __user *arg)
+{
+ int err = 0, i;
+ struct ukevent uk;
+
+ if (down_interruptible(&u->ctl_mutex))
+ return -ERESTARTSYS;
+
+ for (i=0; i<ctl->num; ++i) {
+ if (copy_from_user(&uk, arg, sizeof(struct ukevent))) {
+ err = -EINVAL;
+ break;
+ }
+
+ if (kevent_remove(&uk, u))
+ uk.ret_flags |= KEVENT_RET_BROKEN;
+
+ uk.ret_flags |= KEVENT_RET_DONE;
+
+ if (copy_to_user(arg, &uk, sizeof(struct ukevent))) {
+ err = -EINVAL;
+ break;
+ }
+
+ arg += sizeof(struct ukevent);
+ }
+
+ up(&u->ctl_mutex);
+
+ return err;
+}
+
+int kevent_user_add_ukevent(struct ukevent *uk, struct kevent_user *u)
+{
+ struct kevent *k;
+ int err;
+
+ k = kevent_alloc(GFP_KERNEL);
+ if (!k) {
+ err = -ENOMEM;
+ goto err_out_exit;
+ }
+
+ memcpy(&k->event, uk, sizeof(struct ukevent));
+
+ k->event.ret_flags = 0;
+
+ err = kevent_init(k);
+ if (err) {
+ kevent_free(k);
+ goto err_out_exit;
+ }
+ k->user = u;
+#ifdef CONFIG_KEVENT_USER_STAT
+ u->total++;
+#endif
+ {
+ unsigned long flags;
+ unsigned int hash = kevent_user_hash(&k->event);
+ struct kevent_list *l = &u->kqueue[hash];
+
+ spin_lock_irqsave(&l->kevent_lock, flags);
+ list_add_tail(&k->kevent_entry, &l->kevent_list);
+ u->kevent_num++;
+ kevent_user_get(u);
+ spin_unlock_irqrestore(&l->kevent_lock, flags);
+ }
+
+ err = kevent_enqueue(k);
+ if (err) {
+ memcpy(uk, &k->event, sizeof(struct ukevent));
+ if (err < 0)
+ uk->ret_flags |= KEVENT_RET_BROKEN;
+ uk->ret_flags |= KEVENT_RET_DONE;
+ kevent_finish_user(k, 1, 0);
+ }
+
+err_out_exit:
+ return err;
+}
+
+/*
+ * Copy all ukevents from userspace, allocate kevent for each one
+ * and add them into appropriate kevent_storages,
+ * e.g. sockets, inodes and so on...
+ * If something goes wrong, all events will be dequeued and
+ * negative error will be returned.
+ * On success zero is returned and
+ * ctl->num will be a number of finished events, either completed or failed.
+ * Array of finished events (struct ukevent) will be placed behind
+ * kevent_user_control structure. User must run through that array and check
+ * ret_flags field of each ukevent structure to determine if it is fired or failed event.
+ */
+static int kevent_user_ctl_add(struct kevent_user *u,
+ struct kevent_user_control *ctl, void __user *arg)
+{
+ int err = 0, cerr = 0, num = 0, knum = 0, i;
+ void __user *orig, *ctl_addr;
+ struct ukevent uk;
+
+ if (down_interruptible(&u->ctl_mutex))
+ return -ERESTARTSYS;
+
+ orig = arg;
+ ctl_addr = arg - sizeof(struct kevent_user_control);
+#if 1
+ err = -ENFILE;
+ if (u->kevent_num + ctl->num >= 1024)
+ goto err_out_remove;
+#endif
+ for (i=0; i<ctl->num; ++i) {
+ if (copy_from_user(&uk, arg, sizeof(struct ukevent))) {
+ cerr = -EINVAL;
+ break;
+ }
+ arg += sizeof(struct ukevent);
+
+ err = kevent_user_add_ukevent(&uk, u);
+ if (err) {
+#ifdef CONFIG_KEVENT_USER_STAT
+ u->im_num++;
+#endif
+ if (copy_to_user(orig, &uk, sizeof(struct ukevent)))
+ cerr = -EINVAL;
+ orig += sizeof(struct ukevent);
+ num++;
+ } else
+ knum++;
+ }
+
+ if (cerr < 0)
+ goto err_out_remove;
+
+ ctl->num = num;
+ if (copy_to_user(ctl_addr, ctl, sizeof(struct kevent_user_control)))
+ cerr = -EINVAL;
+
+ if (cerr)
+ err = cerr;
+ if (!err)
+ err = num;
+
+err_out_remove:
+ up(&u->ctl_mutex);
+
+ return err;
+}
+
+/*
+ * Waits until at least ctl->ready_num events are ready or timeout and returns
+ * number of ready events (in case of timeout) or number of requested events.
+ */
+static int kevent_user_wait(struct file *file, struct kevent_user *u,
+ struct kevent_user_control *ctl, void __user *arg)
+{
+ struct kevent *k;
+ int cerr = 0, num = 0;
+ void __user *ptr = arg + sizeof(struct kevent_user_control);
+
+ if (down_interruptible(&u->ctl_mutex))
+ return -ERESTARTSYS;
+
+ if (!(file->f_flags & O_NONBLOCK)) {
+ if (ctl->timeout)
+ wait_event_interruptible_timeout(u->wait,
+ u->ready_num >= ctl->num, msecs_to_jiffies(ctl->timeout));
+ else
+ wait_event_interruptible_timeout(u->wait,
+ u->ready_num > 0, msecs_to_jiffies(1000));
+ }
+ while (num < ctl->num && ((k = kqueue_dequeue_ready(u)) != NULL)) {
+ if (copy_to_user(ptr + num*sizeof(struct ukevent),
+ &k->event, sizeof(struct ukevent)))
+ cerr = -EINVAL;
+
+ /*
+ * If it is one-shot kevent, it has been removed already from
+ * origin's queue, so we can easily free it here.
+ */
+ if (k->event.req_flags & KEVENT_REQ_ONESHOT)
+ kevent_finish_user(k, 1, 1);
+ ++num;
+#ifdef CONFIG_KEVENT_USER_STAT
+ u->wait_num++;
+#endif
+ }
+
+ ctl->num = num;
+ if (copy_to_user(arg, ctl, sizeof(struct kevent_user_control)))
+ cerr = -EINVAL;
+
+ up(&u->ctl_mutex);
+
+ return (cerr)?cerr:num;
+}
+
+static int kevent_ctl_init(void)
+{
+ struct kevent_user *u;
+ struct file *file;
+ int fd, ret;
+
+ fd = get_unused_fd();
+ if (fd < 0)
+ return fd;
+
+ file = get_empty_filp();
+ if (!file) {
+ ret = -ENFILE;
+ goto out_put_fd;
+ }
+
+ u = kevent_user_alloc();
+ if (unlikely(!u)) {
+ ret = -ENOMEM;
+ goto out_put_file;
+ }
+
+ file->f_op = &kevent_user_fops;
+ file->f_vfsmnt = mntget(kevent_mnt);
+ file->f_dentry = dget(kevent_mnt->mnt_root);
+ file->f_mapping = file->f_dentry->d_inode->i_mapping;
+ file->f_mode = FMODE_READ;
+ file->f_flags = O_RDONLY;
+ file->private_data = u;
+
+ fd_install(fd, file);
+
+ return fd;
+
+out_put_file:
+ put_filp(file);
+out_put_fd:
+ put_unused_fd(fd);
+ return ret;
+}
+
+static int kevent_ctl_process(struct file *file,
+ struct kevent_user_control *ctl, void __user *arg)
+{
+ int err;
+ struct kevent_user *u = file->private_data;
+
+ if (!u)
+ return -EINVAL;
+
+ switch (ctl->cmd) {
+ case KEVENT_CTL_ADD:
+ err = kevent_user_ctl_add(u, ctl,
+ arg+sizeof(struct kevent_user_control));
+ break;
+ case KEVENT_CTL_REMOVE:
+ err = kevent_user_ctl_remove(u, ctl,
+ arg+sizeof(struct kevent_user_control));
+ break;
+ case KEVENT_CTL_MODIFY:
+ err = kevent_user_ctl_modify(u, ctl,
+ arg+sizeof(struct kevent_user_control));
+ break;
+ case KEVENT_CTL_WAIT:
+ err = kevent_user_wait(file, u, ctl, arg);
+ break;
+ case KEVENT_CTL_INIT:
+ err = kevent_ctl_init();
+ default:
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
+asmlinkage long sys_kevent_ctl(int fd, void __user *arg)
+{
+ int err, fput_needed;
+ struct kevent_user_control ctl;
+ struct file *file;
+
+ if (copy_from_user(&ctl, arg, sizeof(struct kevent_user_control)))
+ return -EINVAL;
+
+ if (ctl.cmd == KEVENT_CTL_INIT)
+ return kevent_ctl_init();
+
+ file = fget_light(fd, &fput_needed);
+ if (!file)
+ return -ENODEV;
+
+ err = kevent_ctl_process(file, &ctl, arg);
+
+ fput_light(file, fput_needed);
+ return err;
+}
+
+static int kevent_user_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int err = -ENODEV;
+ struct kevent_user_control ctl;
+ struct kevent_user *u = file->private_data;
+ void __user *ptr = (void __user *)arg;
+
+ if (copy_from_user(&ctl, ptr, sizeof(struct kevent_user_control)))
+ return -EINVAL;
+
+ switch (cmd) {
+ case KEVENT_USER_CTL:
+ err = kevent_ctl_process(file, &ctl, ptr);
+ break;
+ case KEVENT_USER_WAIT:
+ err = kevent_user_wait(file, u, &ctl, ptr);
+ break;
+ default:
+ break;
+ }
+
+ return err;
+}
+
+static int __devinit kevent_user_init(void)
+{
+ struct class_device *dev;
+ int err = 0;
+
+ err = register_filesystem(&kevent_fs_type);
+ if (err)
+ panic("%s: failed to register filesystem: err=%d.\n",
+ kevent_name, err);
+
+ kevent_mnt = kern_mount(&kevent_fs_type);
+ if (IS_ERR(kevent_mnt))
+ panic("%s: failed to mount silesystem: err=%ld.\n",
+ kevent_name, PTR_ERR(kevent_mnt));
+
+ kevent_user_major = register_chrdev(0, kevent_name, &kevent_user_fops);
+ if (kevent_user_major < 0) {
+ printk(KERN_ERR "Failed to register \"%s\" char device: err=%d.\n",
+ kevent_name, kevent_user_major);
+ return -ENODEV;
+ }
+
+ kevent_user_class = class_create(THIS_MODULE, "kevent");
+ if (IS_ERR(kevent_user_class)) {
+ printk(KERN_ERR "Failed to register \"%s\" class: err=%ld.\n",
+ kevent_name, PTR_ERR(kevent_user_class));
+ err = PTR_ERR(kevent_user_class);
+ goto err_out_unregister;
+ }
+
+ dev = class_device_create(kevent_user_class, NULL,
+ MKDEV(kevent_user_major, 0), NULL, kevent_name);
+ if (IS_ERR(dev)) {
+ printk(KERN_ERR "Failed to create %d.%d class device in \"%s\" class: err=%ld.\n",
+ kevent_user_major, 0, kevent_name, PTR_ERR(dev));
+ err = PTR_ERR(dev);
+ goto err_out_class_destroy;
+ }
+
+ printk("KEVENT subsystem: chardev helper: major=%d.\n", kevent_user_major);
+
+ return 0;
+
+err_out_class_destroy:
+ class_destroy(kevent_user_class);
+err_out_unregister:
+ unregister_chrdev(kevent_user_major, kevent_name);
+
+ return err;
+}
+
+static void __devexit kevent_user_fini(void)
+{
+ class_device_destroy(kevent_user_class, MKDEV(kevent_user_major, 0));
+ class_destroy(kevent_user_class);
+ unregister_chrdev(kevent_user_major, kevent_name);
+ mntput(kevent_mnt);
+ unregister_filesystem(&kevent_fs_type);
+}
+
+module_init(kevent_user_init);
+module_exit(kevent_user_fini);
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 5433195..dcbacf5 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -121,6 +121,11 @@ cond_syscall(ppc_rtas);
cond_syscall(sys_spu_run);
cond_syscall(sys_spu_create);

+cond_syscall(sys_aio_recv);
+cond_syscall(sys_aio_send);
+cond_syscall(sys_aio_sendfile);
+cond_syscall(sys_kevent_ctl);
+
/* mmu depending weak syscall entries */
cond_syscall(sys_mprotect);
cond_syscall(sys_msync);
diff --git a/net/core/datagram.c b/net/core/datagram.c
index aecddcc..493245b 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -236,6 +236,60 @@ void skb_kill_datagram(struct sock *sk,
EXPORT_SYMBOL(skb_kill_datagram);

/**
+ * skb_copy_datagram - Copy a datagram.
+ * @skb: buffer to copy
+ * @offset: offset in the buffer to start copying from
+ * @to: pointer to copy to
+ * @len: amount of data to copy from buffer to iovec
+ */
+int skb_copy_datagram(const struct sk_buff *skb, int offset,
+ void *to, int len)
+{
+ int i, fraglen, end = 0;
+ struct sk_buff *next = skb_shinfo(skb)->frag_list;
+
+ if (!len)
+ return 0;
+
+next_skb:
+ fraglen = skb_headlen(skb);
+ i = -1;
+
+ while (1) {
+ int start = end;
+
+ if ((end += fraglen) > offset) {
+ int copy = end - offset, o = offset - start;
+
+ if (copy > len)
+ copy = len;
+ if (i == -1)
+ memcpy(to, skb->data + o, copy);
+ else {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+ struct page *page = frag->page;
+ void *p = kmap(page) + frag->page_offset + o;
+ memcpy(to, p, copy);
+ kunmap(page);
+ }
+ if (!(len -= copy))
+ return 0;
+ offset += copy;
+ }
+ if (++i >= skb_shinfo(skb)->nr_frags)
+ break;
+ fraglen = skb_shinfo(skb)->frags[i].size;
+ }
+ if (next) {
+ skb = next;
+ BUG_ON(skb_shinfo(skb)->frag_list);
+ next = skb->next;
+ goto next_skb;
+ }
+ return -EFAULT;
+}
+
+/**
* skb_copy_datagram_iovec - Copy a datagram to an iovec.
* @skb: buffer to copy
* @offset: offset in the buffer to start copying from
@@ -530,6 +584,7 @@ unsigned int datagram_poll(struct file *

EXPORT_SYMBOL(datagram_poll);
EXPORT_SYMBOL(skb_copy_and_csum_datagram_iovec);
+EXPORT_SYMBOL(skb_copy_datagram);
EXPORT_SYMBOL(skb_copy_datagram_iovec);
EXPORT_SYMBOL(skb_free_datagram);
EXPORT_SYMBOL(skb_recv_datagram);
diff --git a/net/core/sock.c b/net/core/sock.c
index 5d820c3..3345048 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -564,6 +564,16 @@ #endif
spin_unlock_bh(&sk->sk_lock.slock);
ret = -ENONET;
break;
+#ifdef CONFIG_KEVENT_SOCKET
+ case SO_ASYNC_SOCK:
+ spin_lock_bh(&sk->sk_lock.slock);
+ if (valbool)
+ sock_set_flag(sk, SOCK_ASYNC);
+ else
+ sock_reset_flag(sk, SOCK_ASYNC);
+ spin_unlock_bh(&sk->sk_lock.slock);
+ break;
+#endif

/* We implement the SO_SNDLOWAT etc to
not be settable (1003.1g 5.3) */
@@ -1313,6 +1323,7 @@ static void sock_def_wakeup(struct sock
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
wake_up_interruptible_all(sk->sk_sleep);
read_unlock(&sk->sk_callback_lock);
+ kevent_socket_notify(sk, KEVENT_SOCKET_RECV|KEVENT_SOCKET_SEND);
}

static void sock_def_error_report(struct sock *sk)
@@ -1322,6 +1333,7 @@ static void sock_def_error_report(struct
wake_up_interruptible(sk->sk_sleep);
sk_wake_async(sk,0,POLL_ERR);
read_unlock(&sk->sk_callback_lock);
+ kevent_socket_notify(sk, KEVENT_SOCKET_RECV|KEVENT_SOCKET_SEND);
}

static void sock_def_readable(struct sock *sk, int len)
@@ -1331,6 +1343,7 @@ static void sock_def_readable(struct soc
wake_up_interruptible(sk->sk_sleep);
sk_wake_async(sk,1,POLL_IN);
read_unlock(&sk->sk_callback_lock);
+ kevent_socket_notify(sk, KEVENT_SOCKET_RECV|KEVENT_SOCKET_SEND);
}

static void sock_def_write_space(struct sock *sk)
@@ -1350,6 +1363,7 @@ static void sock_def_write_space(struct
}

read_unlock(&sk->sk_callback_lock);
+ kevent_socket_notify(sk, KEVENT_SOCKET_SEND|KEVENT_SOCKET_RECV);
}

static void sock_def_destruct(struct sock *sk)
@@ -1454,8 +1468,10 @@ void fastcall release_sock(struct sock *
if (sk->sk_backlog.tail)
__release_sock(sk);
sk->sk_lock.owner = NULL;
- if (waitqueue_active(&(sk->sk_lock.wq)))
+ if (waitqueue_active(&(sk->sk_lock.wq))) {
wake_up(&(sk->sk_lock.wq));
+ kevent_socket_notify(sk, KEVENT_SOCKET_RECV|KEVENT_SOCKET_SEND);
+ }
spin_unlock_bh(&(sk->sk_lock.slock));
}
EXPORT_SYMBOL(release_sock);
diff --git a/net/core/stream.c b/net/core/stream.c
index e948969..91e2e07 100644
--- a/net/core/stream.c
+++ b/net/core/stream.c
@@ -36,6 +36,7 @@ void sk_stream_write_space(struct sock *
wake_up_interruptible(sk->sk_sleep);
if (sock->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN))
sock_wake_async(sock, 2, POLL_OUT);
+ kevent_socket_notify(sk, KEVENT_SOCKET_SEND|KEVENT_SOCKET_RECV);
}
}

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 74998f2..403d33e 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -206,6 +206,7 @@
* lingertime == 0 (RFC 793 ABORT Call)
* Hirokazu Takahashi : Use copy_from_user() instead of
* csum_and_copy_from_user() if possible.
+ * Evgeniy Polyakov : Network asynchronous IO.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -1085,6 +1086,275 @@ int tcp_read_sock(struct sock *sk, read_
}

/*
+ * Must be called with locked sock.
+ */
+int tcp_async_send(struct sock *sk, struct page **pages, unsigned int poffset, size_t len)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ int mss_now, size_goal;
+ int err = -EAGAIN;
+ ssize_t copied;
+
+ /* Wait for a connection to finish. */
+ if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))
+ goto out_err;
+
+ clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+
+ mss_now = tcp_current_mss(sk, 1);
+ size_goal = tp->xmit_size_goal;
+ copied = 0;
+
+ err = -EPIPE;
+ if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN) || sock_flag(sk, SOCK_DONE) ||
+ (sk->sk_state == TCP_CLOSE) || (atomic_read(&sk->sk_refcnt) == 1))
+ goto do_error;
+
+ while (len > 0) {
+ struct sk_buff *skb = sk->sk_write_queue.prev;
+ struct page *page = pages[poffset / PAGE_SIZE];
+ int copy, i, can_coalesce;
+ int offset = poffset % PAGE_SIZE;
+ int size = min_t(size_t, len, PAGE_SIZE - offset);
+
+ if (!sk->sk_send_head || (copy = size_goal - skb->len) <= 0) {
+new_segment:
+ if (!sk_stream_memory_free(sk))
+ goto wait_for_sndbuf;
+
+ skb = sk_stream_alloc_pskb(sk, 0, 0,
+ sk->sk_allocation);
+ if (!skb)
+ goto wait_for_memory;
+
+ skb_entail(sk, tp, skb);
+ copy = size_goal;
+ }
+
+ if (copy > size)
+ copy = size;
+
+ i = skb_shinfo(skb)->nr_frags;
+ can_coalesce = skb_can_coalesce(skb, i, page, offset);
+ if (!can_coalesce && i >= MAX_SKB_FRAGS) {
+ tcp_mark_push(tp, skb);
+ goto new_segment;
+ }
+ if (!sk_stream_wmem_schedule(sk, copy))
+ goto wait_for_memory;
+
+ if (can_coalesce) {
+ skb_shinfo(skb)->frags[i - 1].size += copy;
+ } else {
+ get_page(page);
+ skb_fill_page_desc(skb, i, page, offset, copy);
+ }
+
+ skb->len += copy;
+ skb->data_len += copy;
+ skb->truesize += copy;
+ sk->sk_wmem_queued += copy;
+ sk->sk_forward_alloc -= copy;
+ skb->ip_summed = CHECKSUM_HW;
+ tp->write_seq += copy;
+ TCP_SKB_CB(skb)->end_seq += copy;
+ skb_shinfo(skb)->tso_segs = 0;
+
+ if (!copied)
+ TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_PSH;
+
+ copied += copy;
+ poffset += copy;
+ if (!(len -= copy))
+ goto out;
+
+ if (skb->len < mss_now)
+ continue;
+
+ if (forced_push(tp)) {
+ tcp_mark_push(tp, skb);
+ __tcp_push_pending_frames(sk, tp, mss_now, TCP_NAGLE_PUSH);
+ } else if (skb == sk->sk_send_head)
+ tcp_push_one(sk, mss_now);
+ continue;
+
+wait_for_sndbuf:
+ set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
+wait_for_memory:
+ if (copied)
+ tcp_push(sk, tp, 0, mss_now, TCP_NAGLE_PUSH);
+
+ err = -EAGAIN;
+ goto do_error;
+ }
+
+out:
+ if (copied)
+ tcp_push(sk, tp, 0, mss_now, tp->nonagle);
+ return copied;
+
+do_error:
+ if (copied)
+ goto out;
+out_err:
+ return sk_stream_error(sk, 0, err);
+}
+
+/*
+ * Must be called with locked sock.
+ */
+int tcp_async_recv(struct sock *sk, void *dst, size_t len)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ int copied = 0;
+ u32 *seq;
+ unsigned long used;
+ int err;
+ int target; /* Read at least this many bytes */
+
+ TCP_CHECK_TIMER(sk);
+
+ err = -ENOTCONN;
+ if (sk->sk_state == TCP_LISTEN)
+ goto out;
+
+ seq = &tp->copied_seq;
+
+ target = sock_rcvlowat(sk, 0, len);
+
+ do {
+ struct sk_buff *skb;
+ u32 offset;
+
+ /* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */
+ if (tp->urg_data && tp->urg_seq == *seq) {
+ if (copied)
+ break;
+ }
+
+ /* Next get a buffer. */
+
+ skb = skb_peek(&sk->sk_receive_queue);
+ do {
+ if (!skb)
+ break;
+
+ /* Now that we have two receive queues this
+ * shouldn't happen.
+ */
+ if (before(*seq, TCP_SKB_CB(skb)->seq)) {
+ printk(KERN_INFO "async_recv bug: copied %X "
+ "seq %X\n", *seq, TCP_SKB_CB(skb)->seq);
+ break;
+ }
+ offset = *seq - TCP_SKB_CB(skb)->seq;
+ if (skb->h.th->syn)
+ offset--;
+ if (offset < skb->len)
+ goto found_ok_skb;
+ if (skb->h.th->fin)
+ goto found_fin_ok;
+ skb = skb->next;
+ } while (skb != (struct sk_buff *)&sk->sk_receive_queue);
+
+ if (copied)
+ break;
+
+ if (sock_flag(sk, SOCK_DONE))
+ break;
+
+ if (sk->sk_err) {
+ copied = sock_error(sk);
+ break;
+ }
+
+ if (sk->sk_shutdown & RCV_SHUTDOWN)
+ break;
+
+ if (sk->sk_state == TCP_CLOSE) {
+ if (!sock_flag(sk, SOCK_DONE)) {
+ /* This occurs when user tries to read
+ * from never connected socket.
+ */
+ copied = -ENOTCONN;
+ break;
+ }
+ break;
+ }
+
+ copied = -EAGAIN;
+ break;
+
+ found_ok_skb:
+ /* Ok so how much can we use? */
+ used = skb->len - offset;
+ if (len < used)
+ used = len;
+
+ /* Do we have urgent data here? */
+ if (tp->urg_data) {
+ u32 urg_offset = tp->urg_seq - *seq;
+ if (urg_offset < used) {
+ if (!urg_offset) {
+ if (!sock_flag(sk, SOCK_URGINLINE)) {
+ ++*seq;
+ offset++;
+ used--;
+ if (!used)
+ goto skip_copy;
+ }
+ } else
+ used = urg_offset;
+ }
+ }
+
+ err = skb_copy_datagram(skb, offset, dst, used);
+ if (err) {
+ /* Exception. Bailout! */
+ if (!copied)
+ copied = -EFAULT;
+ break;
+ }
+
+ *seq += used;
+ copied += used;
+ len -= used;
+ dst += used;
+
+ tcp_rcv_space_adjust(sk);
+
+skip_copy:
+ if (tp->urg_data && after(tp->copied_seq, tp->urg_seq)) {
+ tp->urg_data = 0;
+ tcp_fast_path_check(sk, tp);
+ }
+ if (used + offset < skb->len)
+ continue;
+
+ if (skb->h.th->fin)
+ goto found_fin_ok;
+ sk_eat_skb(sk, skb);
+ continue;
+
+ found_fin_ok:
+ /* Process the FIN. */
+ ++*seq;
+ sk_eat_skb(sk, skb);
+ break;
+ } while (len > 0);
+
+ /* Clean up data we have read: This will do ACK frames. */
+ cleanup_rbuf(sk, copied);
+
+ TCP_CHECK_TIMER(sk);
+ return copied;
+
+out:
+ TCP_CHECK_TIMER(sk);
+ return err;
+}
+
+/*
* This routine copies from a sock struct into the user buffer.
*
* Technical note: in 2.3 we work on _locked_ socket, so that
@@ -2259,6 +2529,8 @@ EXPORT_SYMBOL(tcp_getsockopt);
EXPORT_SYMBOL(tcp_ioctl);
EXPORT_SYMBOL(tcp_poll);
EXPORT_SYMBOL(tcp_read_sock);
+EXPORT_SYMBOL(tcp_async_recv);
+EXPORT_SYMBOL(tcp_async_send);
EXPORT_SYMBOL(tcp_recvmsg);
EXPORT_SYMBOL(tcp_sendmsg);
EXPORT_SYMBOL(tcp_sendpage);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index e08245b..5655b1e 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3113,6 +3113,7 @@ static void tcp_ofo_queue(struct sock *s

__skb_unlink(skb, &tp->out_of_order_queue);
__skb_queue_tail(&sk->sk_receive_queue, skb);
+ kevent_socket_notify(sk, KEVENT_SOCKET_RECV);
tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
if(skb->h.th->fin)
tcp_fin(skb, sk, skb->h.th);
@@ -3956,7 +3957,8 @@ int tcp_rcv_established(struct sock *sk,
int copied_early = 0;

if (tp->copied_seq == tp->rcv_nxt &&
- len - tcp_header_len <= tp->ucopy.len) {
+ len - tcp_header_len <= tp->ucopy.len &&
+ !sock_async(sk)) {
#ifdef CONFIG_NET_DMA
if (tcp_dma_try_early_copy(sk, skb, tcp_header_len)) {
copied_early = 1;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 25ecc6e..05d7086 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -62,6 +62,7 @@ #include <linux/cache.h>
#include <linux/jhash.h>
#include <linux/init.h>
#include <linux/times.h>
+#include <linux/kevent.h>

#include <net/icmp.h>
#include <net/inet_hashtables.h>
@@ -850,6 +851,7 @@ #endif
reqsk_free(req);
} else {
inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
+ kevent_socket_notify(sk, KEVENT_SOCKET_ACCEPT);
}
return 0;

@@ -1089,24 +1091,30 @@ process:

skb->dev = NULL;

- bh_lock_sock(sk);
ret = 0;
- if (!sock_owned_by_user(sk)) {
+ if (sock_async(sk)) {
+ spin_lock_bh(&sk->sk_lock.slock);
+ ret = tcp_v4_do_rcv(sk, skb);
+ spin_unlock_bh(&sk->sk_lock.slock);
+ } else {
+ bh_lock_sock(sk);
+ if (!sock_owned_by_user(sk)) {
#ifdef CONFIG_NET_DMA
- struct tcp_sock *tp = tcp_sk(sk);
- if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
- tp->ucopy.dma_chan = get_softnet_dma();
- if (tp->ucopy.dma_chan)
- ret = tcp_v4_do_rcv(sk, skb);
- else
+ struct tcp_sock *tp = tcp_sk(sk);
+ if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
+ tp->ucopy.dma_chan = get_softnet_dma();
+ if (tp->ucopy.dma_chan)
+ ret = tcp_v4_do_rcv(sk, skb);
+ else
#endif
- {
- if (!tcp_prequeue(sk, skb))
- ret = tcp_v4_do_rcv(sk, skb);
- }
- } else
- sk_add_backlog(sk, skb);
- bh_unlock_sock(sk);
+ {
+ if (!tcp_prequeue(sk, skb))
+ ret = tcp_v4_do_rcv(sk, skb);
+ }
+ } else
+ sk_add_backlog(sk, skb);
+ bh_unlock_sock(sk);
+ }

sock_put(sk);

@@ -1830,6 +1838,8 @@ struct proto tcp_prot = {
.getsockopt = tcp_getsockopt,
.sendmsg = tcp_sendmsg,
.recvmsg = tcp_recvmsg,
+ .async_recv = tcp_async_recv,
+ .async_send = tcp_async_send,
.backlog_rcv = tcp_v4_do_rcv,
.hash = tcp_v4_hash,
.unhash = tcp_unhash,
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index a50eb30..e27e231 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1215,22 +1215,28 @@ process:

skb->dev = NULL;

- bh_lock_sock(sk);
ret = 0;
- if (!sock_owned_by_user(sk)) {
+ if (sock_async(sk)) {
+ spin_lock_bh(&sk->sk_lock.slock);
+ ret = tcp_v4_do_rcv(sk, skb);
+ spin_unlock_bh(&sk->sk_lock.slock);
+ } else {
+ bh_lock_sock(sk);
+ if (!sock_owned_by_user(sk)) {
#ifdef CONFIG_NET_DMA
- struct tcp_sock *tp = tcp_sk(sk);
- if (tp->ucopy.dma_chan)
- ret = tcp_v6_do_rcv(sk, skb);
- else
-#endif
- {
- if (!tcp_prequeue(sk, skb))
+ struct tcp_sock *tp = tcp_sk(sk);
+ if (tp->ucopy.dma_chan)
ret = tcp_v6_do_rcv(sk, skb);
- }
- } else
- sk_add_backlog(sk, skb);
- bh_unlock_sock(sk);
+ else
+#endif
+ {
+ if (!tcp_prequeue(sk, skb))
+ ret = tcp_v6_do_rcv(sk, skb);
+ }
+ } else
+ sk_add_backlog(sk, skb);
+ bh_unlock_sock(sk);
+ }

sock_put(sk);
return ret ? -1 : 0;
@@ -1580,6 +1586,8 @@ struct proto tcpv6_prot = {
.getsockopt = tcp_getsockopt,
.sendmsg = tcp_sendmsg,
.recvmsg = tcp_recvmsg,
+ .async_recv = tcp_async_recv,
+ .async_send = tcp_async_send,
.backlog_rcv = tcp_v6_do_rcv,
.hash = tcp_v6_hash,
.unhash = tcp_unhash,
-
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