Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Also add a few more comments.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

And use SHMEMS_SIZE constant as well.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

In commit 99eb3d09
we started to use self-contained shared memory
region but it revealed the problem that anonymous
sgared mappings might be parsed by parse_maps incorrectly,
so fix it and be ready to get anon-shared mappings.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Also make output a bit more fancy, as

CR_FD_UNIXSK: unixsk-2440.img
----------------------------------------
fd    3 type  1 state  1 namelen    0 id  19406 peer  19407
fd    4 type  1 state  1 namelen    0 id  19407 peer  19406
fd    5 type  2 state  7 namelen    7 id  19408 peer      0	---> [tst-sk]
fd    6 type  2 state  7 namelen    0 id  19409 peer      0
fd    7 type  2 state  7 namelen    0 id  19410 peer  19411
fd    8 type  2 state  7 namelen    8 id  19411 peer      0	---> [tst-sk1]
----------------------------------------
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

It also tests for possible dup() call error.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Several places just need to open an image, thus the helper is OK to use.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

It duplicates the show_dump_file pointer.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

To follow rest of code

 - use !x for xalloc result tests
 - structure members are tab aligned
 - multiline assignments over structure members are aligned as well
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

UNIX_PATH_MAX is a size of path, so max length
should never be equal to such size.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

For better readability.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Since we're not system library

 - no underscopes in functions name until really needed
   and known to not clash with posix namespace
 - empty line between system headers and own headers
   for readability
 - extern for function prototypes
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Drop USK_DEBUG, we have dprintk which is active
if compiled with make DEBUG=1
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

We provide such type in types.h.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

This allows to use pr_debug and dprintk helpers.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

For easier debugging. We can zap it at release time.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Otherwise getting errors like

 | CC       libnetlink.o
 | In file included from libnetlink.c:4:0:
 | ./include/libnetlink.h:34:0: error: "NLMSG_LENGTH" redefined [-Werror]

And make macros a bit more readable.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Cosmetic change.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
[gorcunov: A few tuneups]
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
[gorcunov: log error in restorer.c]
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

The next patch will remap shmems region and will use it in restorer.
Actually this patch moves shmem_nr to struct shmems.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
[gorcunov: Various tuneups]
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Based-on-patch-from: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Andrey Vagin <avagin@openvz.org>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Currently it can only work with stream sockets, which have no skbs in queues
(listening or established -- both work OK).

The cpt part uses the sock_diag engine that was merged to Dave recently to
collect sockets. Then it dumps sockets by checking the filesystem ID of a
failed-to-open through /proc/pid/fd descriptors (sockets do not allow for
such tricks with opens through proc) against SOCKFS_TYPE.

The rst part is more tricky. Listen sockets are just restored, this is simple.
Connected sockets are restored like this:

1. One end establishes a listening anon socket at the desired descriptor;
2. The other end just creates a socket at the desired descriptor;
3. All sockets, that are to be connect()-ed call connect. Unix sockets
   do not block connect() till the accept() time and thus we continue with...
4. ... all listening sockets call accept() and ... dup2 the new fd into the
   accepting end.

There's a problem with this approach -- socket names are not preserved, but
looking into our OpenVZ implementation I think this is OK for existing apps.

What should be done next is:

1. Need to merge the file IDs patches in our tree and make Andrey to
   support files sharing. This will solve the

	sk = socket();
	fork();

   case. Currently it simply doesn't work :(

2. Need to add support for DGRAM sockets -- I wrote comment how to do it
   in the can_dump_unix_sk()

3. Need to add support for in-flight connections

4. Implement support for UDP sockets (quite simple)

5. Implement support for listening TCP sockets (also not very complex)

6. Implement support for connected TCP scokets (hard one, Tejun's patches are not
   very good for this from my POV)

Cyrill, plz, apply this patch and put the above descriptions onto wiki docs (do we
have the plans page yet?).

Andrey, plz, take care of unix sockets tests in zdtm. Most likely it won't work till
you do the shared files support for sockets.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

When opening an fd at a position where the current image fd sits
the latter one should be moved.

Introduce a helper for this.

Signed-off-by; Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Nobody cares the returned fd, so just make it 0/-1 and clean up the callers.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Due to code specifics (we're running without
glibc support) we need own one.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

Otherwise -EINVAL returned
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>