This helps cleanup cr-time mounts a little bit.

travis-ci: success for mount: Add ->collect callback
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for mount: Sanitize sb comparison code
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Introduce fstype->sb_equal and move btrfs-specific checks
into it.

travis-ci: success for mount: Sanitize sb comparison code
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for mount: Sanitize sb comparison code
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Before:
  [~]# criu check lazy_pages
  Looks good.
  [~]# criu check --feature lazy_pages
  Error (criu/kerndat.c:588): Lazy pages are not available
After:
  [~]# criu check lazy_pages
  Error: excessive parameters for command check
  ...skipped usage() output...

Just a little improvement, not to mislead anyone.

Cc: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Reviewed-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

O_* flags should be in event_f_flags parameter, according to
fanotify_init(2).
On x86_32 fanotify_mark() has second mask argument (as mask is 64-bit,
the higher parts of mask shouldn't be used):
> COMPAT_SYSCALL_DEFINE6(fanotify_mark,
> 				int, fanotify_fd, unsigned int, flags,
> 				__u32, mask0, __u32, mask1, int, dfd,
> 				const char  __user *, pathname)
> {
> 	return sys_fanotify_mark(fanotify_fd, flags,
> #ifdef __BIG_ENDIAN
> 				((__u64)mask0 << 32) | mask1,
> #else
> 				((__u64)mask1 << 32) | mask0,
> #endif
> 				 dfd, pathname);

travis-ci: success for 32-bit tests fixes
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

The sub-process should wait for the parent task signal before
checking the locks status
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

There are 3 tests that cover the following cases:

1. single OFD lock
2. overlapped OFD locks
3. inhertited OFD locks

Tests logic is similar to logic of tests for other lock types.

OFD lock specific header-only library was added to avoid code
duplication in the tests.

travis-ci: success for series starting with [1/2] locks: Add ofd locks c/r
Signed-off-by: Begunkov Pavel <asml.silence@gmail.com>
Signed-off-by: Eugene Batalov <eabatalov89@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

OFD locks logic reuses existing locks c/r functionality.

https://github.com/xemul/criu/issues/42
travis-ci: success for series starting with [1/2] locks: Add ofd locks c/r
Signed-off-by: Begunkov Pavel <asml.silence@gmail.com>
Signed-off-by: Eugene Batalov <eabatalov89@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Unfortunately the kernel wakes up only one waiter even
if they waits with MSG_PEEK, so the introduced scheme doesn't work.

Reported-by: Mr Jenkins
travis-ci: success for Revert "zdtm: use a unix socket instead of a pipe to synchronizer processes"
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

With `-r` option relocation to parasite_service
was not made on ARM:
0x76dbc018:	bl	0x76dbc018		0xebfffffe
(You may saw it with objdump also).

This leaded to hang at "Putting tsock" message:
(01.368297) ----------------------------------------
(01.368321)
(01.368339) Collecting fds (pid: 13503)
(01.368360) ----------------------------------------
(01.368535) Found 3 file descriptors
(01.368564) ----------------------------------------
(01.368648) Dump private signals of 13503
(01.368708) Dump shared signals of 13503
(01.368761) Parasite syscall_ip at 0x10000
(01.369605) Set up parasite blob using memfd
(01.369641) Putting parasite blob into 0x76cc5000->0x76e1f000
(01.369755) Dumping GP/FPU registers for 13503
(01.369818) Putting tsock into pid 13503

Link against lib.a which also fixes build for aarm64.
Reported-by: alex vk <avankemp@gmail.com>
Reported-by: long.wanglong <long.wanglong@huawei.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Backported-from-criu-dev-by: Dmitry Safonov <dsafonov@virtuozzo.com>

So, this time we had TCP transitional states support, but it was
in semi-finished libsoccr library :) And in order to have the TCP
C/R fixed we fixed the library and are now ready to release them
both.

Said that, two main features of the Waxwing release are

* libsoccr -- the library for TCP sockets C/R
* TCP transitional states C/R

Also we have a set of bugfixes, caught performance issue on Xen
and a little bit more.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

As described in issue #268, breakpoints degrades restore performance
in Xen guests. Untill we find out what's going on we disable them.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

It's the same as libsoccr_resume, but doesn't mess with
the socket file descriptor. Just release the handle.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

This test construct both ends of tcp connections and
check that it works in both directions.

travis-ci: success for soccr: add a test
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for series starting with [1/2] tcp: Move window checking code into cr-check.c
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for series starting with [1/2] tcp: Move window checking code into cr-check.c
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Only sockets in the repair mode can be bound to the same
port a few time, what is required to restore tcp connects.

v2: move bind() into libsoccr
v3: fix an error message
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>

There will be calls that return objects from inside library
and vice versa -- accept objects from caller. Let's have a
flag controlling who's going to free the mem in question.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>

CID 173075 (#1 of 1): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking data suggests that it may be null, but it has already been dereferenced on all paths leading to the check.

travis-ci: success for soccr: don't dereference data before null check
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Looks like it is internal logic too, so it may be better to move into the library too.

travis-ci: success for soccr: restore queues from soccr
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for scripts/install-debian-packages: add libnet-dev
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

These hooks opens inetsk.img, but it doesn't exist if
processes were pre-dumped.

travis-ci: success for test: skip pre-dump images in socket-tcp*.hook
Reported-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

They have to be the same on each iteration.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Check source and destination addresses for closed tcp sockets.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Check source and destination addresses for closed tcp sockets.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

TCP_CLOSING both sides have shutdown but we still have
            data we have to finish sending

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

TCP_CLOSE_WAIT remote side has shutdown and is waiting for
               us to finish writing our data and to shutdown
               (we have to close() to move on to LAST_ACK)

TCP_LAST_ACK   out side has shutdown after remote has
               shutdown.  There may still be data in our
               buffer that we have to finish sending

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

TCP_FIN_WAIT1 our side has shutdown, waiting to complete
	  transmission of remaining buffered data

TCP_FIN_WAIT2 all buffered data sent, waiting for remote
	  to shutdown

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

libsoccr knows how to restore these sockets.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

soccr already knows how to restore this sockets.

CRIU has to ...:
* unlock all packets with the SOCCR_MARK mark
* request half-closed socket via socket_diag
* transpit src and dst addresses to libsoccr

v2: remove SOCCR_FLAGS_ACKED_FIN
travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

If a socket has been closed, it still has both addresses and
we need to dump them.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

For that we restore all sockets properties and then
disable the repair mode before calling connect() and
the kernel will sent a syn packet and move the socket
into the sys-sent state.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

A socket is in one of half-closed states, if it sent a fin packet
or it received a fin packet.

CRIU plays with fin packets to restore half-closed states too.

When we need to sent a fin packet from a socket, we can call
shutdown(SHUT_WR). When a fin packet has to be restore in
a received queue, criu generate a fin packet and send it via
a raw ip socket.

A raw packet is sent with the SOCCR_MARK mark to be able
to not block it.

v2: remove the SOCCR_FLAGS_ACKED_FIN flag
    introduce sets of bits for different actions with fin packets

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

We will need to disable the repair mode before connect()
to restore syn-sent sockets. And even now connect() looks
like a part of internal logic of libsoccr.

travis-ci: success for series starting with [01/21] build: install libnet-dev
v2: remove libsoccr_set_sk_data_unbound() from soccr.h
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

These addresses will be used to restore half-closed sockets,
we will need to send a fake fin packet for that.

And in the next patch connect() will be moved into soccr.
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>