https://travis-ci.org/criupatchwork/criu/builds/177945936Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

We can MSG_PEEK those and can dump the files easily. The
problem is in restore -- we need to first pass through all
the fdinfo openings before sending the descriptors out, but
by that time some sending sockets may have already closed :(

So for now just detect SCM-s in queue and abort the dump,
otherwise we'd just have them lost and the state spoiled.

https://travis-ci.org/criupatchwork/criu/builds/177945936Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

1. Dropped check for (fd < 0) - there is check after open() in the
test, just two lines upper or so.
2. Combined two test to share common code: they differ only by proc
path to open in a dead process.

travis-ci: success for pstree: rename lookup_create_{item <=> pid} (rev2)
Cc: Tycho Andersen <tycho.andersen@canonical.com>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Currently each page read request results in pread() call. But
we can do better -- if there's no urgent need in data (which is
likely the case for non-cow pagemaps) we can save where the
date should go to and then read it in in one preadv syscall.

For lazy pages we get an ability to do async read_pages call
that would send the request to server and return w/o data in
the buffer.

The explicit sync() method is added since .close is void and
nobody checks its return code.

v2: Lost limits.h in pagemap.c for IOV_MAX (compilation).
v3: split added code into smaller chunks

https://travis-ci.org/criupatchwork/criu/builds/175451746Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Flag PR_ASYNC means, that the caller is OK if the routine
returns w/o data read into the buffer provided.

https://travis-ci.org/criupatchwork/criu/builds/175451746Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

It's already written into page_read->pi_off, so just use one.

https://travis-ci.org/criupatchwork/criu/builds/175451746Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>

travis-ci: success for page-xfer: spelling: s/heppen/happen
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

With in-memory pagemap put_pagemap is not required because it does not
frees any resources. Minor modifications to get_pagemap and init_pagemaps
allow proper bookkeeping without put_pagemap.
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for headers: Switch to common linkage.h
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

The rest is to be moved into compel, while this particular
strucure is only needed by criu.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

The 2nd big splitting patch -- move most of the code that is
infect-related and doesn't know about criu internals (like
protobuf) out of types.h headers.

This is also big and fat patch, but it just moves the code
around. Applies on top of sigframe extracting patch.

Travis: https://travis-ci.org/xemul/criu/builds/171439595Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-and-ported-on-dev-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

There's a lot of code making sigframes for PIE spread all over the
asm/restorer.h and arch/crtools.c. This patch collects it all into
asm/sigframe.h and arch/sigframe.c for better modularity and for
the sake of compel.

The patch is huge, but it just moves the code around (making u32/u64
types conversions to uint32/64_t-s where appropriate).

travis-ci: success for sigframe: Move sigframe-related code into sigframe.*
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-and-ported-on-dev-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

flake8 --config=scripts/flake8.cfg test/zdtm.py
test/zdtm.py:66:1: E305 expected 2 blank lines after class or function definition, found 1
test/zdtm.py:127:1: E305 expected 2 blank lines after class or function definition, found 1
test/zdtm.py:971:1: E305 expected 2 blank lines after class or function definition, found 1
test/zdtm.py:1618:1: E305 expected 2 blank lines after class or function definition, found 1
Makefile:377: recipe for target 'lint' failed

travis-ci: success for zdtm: fix flake8 warnings
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

When C/R-ing a net namespace with --empty-ns net option we should also
skip netfilter rules too (as per https://github.com/docker/docker/issues/27597).

However, there's one thing to be handled -- local TCP blocking rules are
expected to be there on restore by restore_iptables() which is no longer
the case, so put them back manually.

Test included, checked on zdtm/static/socket-tcpbuf-local :)

v2: Full scripts for empty netns setup.

https://github.com/xemul/criu/issues/246Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

So, this time we've mostly have a lot of code rework for
compel. A big portion of it is still in criu-dev, but
some has been merged into master.

Other than this and a bunch of bugfixes -- .config file,
support for Tun-Tap devices and deprecation of several
CLI and RPC options by the --external one.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Since iprule commit 67a990b81126 command "ip rule del" is not working anymore:

    iproute: disallow ip rule del without parameters

    Disallow run `ip rule del` without any parameter to avoid delete any first
    rule from table.
Signed-off-by: Andrey Jr. Melnikov <temnota.am@gmail.com>

So, criu restore fails with:

    Error (criu/net.c:1277): IP tool failed on rule delete

Fix that by explicit passing of rule's table.

v2: Use "ip rule flush" to main's and default's table rules at once.

travis-ci: success for net: Make criu do not fail on recent iproute2 (rev2)
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Introduce helper functions for reading pages from parent snapshot and for
reading pages from local pages*img

travis-ci: success for criu: pagemap: minor improvements
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Some pagemap methods mix up using PIDs and pagemap internal ids. Using the
'pid' name in places that actually refer to PIDs makes the code clearer.

travis-ci: success for criu: pagemap: minor improvements
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

It is already present in rpc, so lets add it to libcriu too.
Signed-off-by: Ruslan Kuprieiev <rkuprieiev@cloudlinux.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

When using pr_perror(), we should not end the message with \n,
as it is added automatically.

Unfortunately, I still can't figure a way to check this at compile
time, so here's the annual patch.

travis-ci: success for Assorted nitpicks
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

In certain places, such as after a syscall, we use pr_perror()
to automatically add strerror(errno) to the error message.

In places we're not sure if errno was set by a function we called,
we should use pr_err() instead.

travis-ci: success for Assorted nitpicks
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

1. Make sure to use xmalloc() where an error message makes sense
2. Make sure to not ignore if NULL is returned

travis-ci: success for Assorted nitpicks
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Using xstrdup lets us have an error message printed if malloc() fails.

travis-ci: success for Assorted nitpicks
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

We already have a wrapper that spits out an error, use it.

travis-ci: success for Assorted nitpicks
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

open_proc* and fopen_proc* are all macros, and they print errors in case
something is wrong (and as they are macros they print correct file:line
info, too). So, there is no need to print another error message
right after calling those.

This fixes double error messages like these:

(00.047295) Error (criu/proc_parse.c:990): Can't open 18472/status on procfs: No such file or directory
(00.047298) Error (criu/proc_parse.c:992): Can't open proc status: No such file or directory

travis-ci: success for Assorted nitpicks
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Our log functions save errno and restore it. Restoring should be
at the very end of the __print_on_level() function, but
commit 6ae4a973 ("rpc: Report back first error message on failure")
messed with it.

Move errno restore at the end of the function.

travis-ci: success for Assorted nitpicks
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

An errno from setns might be lost after close()s, so change the order.

travis-ci: success for Assorted nitpicks
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for tests: Add RPC testing to CI (rev2)
Acked-by: Andrey Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Travis sets up the GCOV variable to collect coverage and
provides an external mount for this. Thus handling this
option in RPC mode is essential.

travis-ci: success for tests: Add RPC testing to CI (rev2)
Acked-by: Andrey Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for tests: Add RPC testing to CI (rev2)
Acked-by: Andrey Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Now the --ext-mount-map is deprecated option, so fix it to
become the --external one.

travis-ci: success for tests: Add RPC testing to CI (rev2)
Acked-by: Andrey Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

It seems to me most of the clean hooks (used by cgroup*, macvlan* cr_veth*
and mnt_tracefs* were all designed to be run to clean up after the test, no
matter whether it failed or succeeded. Let's always run them, so Andrei
doesn't hate me :D

travis-ci: success for zdtm.py: run --clean hook on test failure
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
CC: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

06:46:44.191:    24: ERR: fifo_loop.c:52: can't make fifo "fifo_loop.test-00" (errno = 17 (File exists))

Reported-by: Mr Jenkins
travis-ci: success for zdtm: cleanup fifo_loop.test-0*
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Apparently, there's no clang-3.8 for Ubuntu Trusty arm64. The latest
available version is 3.6, let's try to use it.

https://travis-ci.org/kolyshkin/criu/builds/173168198Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

As recommended by [1], "Always combine RUN apt-get update with apt-get
install in the same RUN statement". Also, ditch "apt-get clean", as it
seems to be useless.

[1] https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/

https://travis-ci.org/kolyshkin/criu/builds/173168198
Cc: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

travis-ci: success for series starting with [1/2] ppc: Add atomic_dec_return()
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Borrowed from Linux kernel.

travis-ci: success for series starting with [1/2] ppc: Add atomic_dec_return()
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

I'm unsure where all these %%s before register names comes from,
but they confuse clang, like this:

> criu/arch/arm/parasite-head.S:6:6: error: unexpected token in operand
>  sub %r2, %pc, #8 @ get the address of this instruction
>     ^

This patch looks scary, but all it does is removing %s before
register names, fixing a few "many spaces instead of a tab" issues
along the way.

travis-ci: success for Fixes to compile on arm with clang
Cc: Christopher Covington <cov@codeaurora.org>
Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Reviewed-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

I got the following then trying to compile CRIU on ARM with clang:

> criu/cr-restore.c:2476:22: error: implicit conversion from 'unsigned
> long long' to 'unsigned long' changes value from 18446744073709551615 to
> 4294967295 [-Werror,-Wconstant-conversion]
>         return ival == -1 ? RLIM_INFINITY : ival;
>         ~~~~~~              ^~~~~~~~~~~~~
> /usr/include/arm-linux-gnueabihf/bits/resource.h:117:24: note: expanded
> from macro 'RLIM_INFINITY'
> # define RLIM_INFINITY 0xffffffffffffffffuLL
>                        ^~~~~~~~~~~~~~~~~~~~~
> 1 error generated.

Fix by using provided rlim_t type in this and similar places.

travis-ci: success for Fixes to compile on arm with clang
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Somehow clang doesn't always like -Wa flags, for example when making
dependencies (see commit 9303ed3 ("Makefiles: move -Wa,--noexecstack
out of CFLAGS"), which causes build break, scary error messages, and
even hair loss.

There are many ways to solve this. This patch employs the one
that is simple and clean.

The -Wa,-mimplicit-it=always flag was added by commit 79c4b747
("arm: fix compilation on ARMv7"). The reason is, ARM needs an IT
instruction before certain conditionals. Those IT instructions are
almost always automatically generated by assembler itself, but in some
cases a special assembler flag (like the one above) is needed.

As there is only one place in the code that need IT, it's easy to patch
it (add explicit IT) and remove the flag. Note that "IT" generates
no machine code per se, so there should not be any functional change
(although I haven't checked it).

For more info on IT, see http://tinyurl.com/z3ldsdr

Hope for a review from our ARM experts.

travis-ci: success for Fixes to compile on arm with clang
Cc: Christopher Covington <cov@codeaurora.org>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>