The ability to set PR_SET_MM_AUXV is implemented
in kernel as a separate PR_SET_MM extension, so
we need to test if the kernel patch is applied
on a running system.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Add basic test for prctl PR_SET_MM opcodes support.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

All these files are now properly prepared by the parasite
invocation code by using open_image calls.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This is done by open_image_ro in the restorer bootstrap preparation code.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

These are image files that weren't yet opened, thus should be
opened with proper checks.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

Collect pstree_item-s on restore in big list. This lets
us not lseek this file on restore and simplifies the code
a little.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It uses the vma image right now, but the image is already sucked in.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

In commit 71cc2733
I occasionally dropped the ability to abort on waiting
(because we used signed -1 value to inform waiters that
something is wrong and waiting should be aborted, but
the type was changed to unsigned one and as result
this condition never triggers).

So to resolve it futex_abort_and_wake() is added and
should be used explicitly where appropriate instead
if signess hack.
Reported-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This was required when pages were stored in elf files for
exec. Now we can stop reading it on eof.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This will be needed for pipes, since we can't keep the pipe's
other end till that for dup.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The list_head ptr passed into it can be converted into
the respective _info with container_of, rather than search.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Now fdinfos are collected independently from reg files and
sockets. During tihs collect we effectively create the mirroring
list of both by checking which type-IDs are added first.

Fix this by removing the fdinfo_desc and attaching fds directly
to collected reg files and sockets. Pipes and unix sockets will
be reworked in the same manner soon.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Same as prev 2 patches now for the unix sockets. They are still in per-pid image files, but
this is going to change soon (I hope).
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Same as previous patch -- pull inet sockets in and store in the hash for the same reasons.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Instread of re-reading this image again and again on every fd restore, pull the
reg-files.img in early and store the entries in a hash. This will simplify the
further fd restoring fixes and will allow for dump/restore via a stream (socket).
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

At moment no-deps-targets is empty thus changes
in headers do not cause correspond source files
to be rebuilt. Fix it.
Reported-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This object file will be handled by ld script so .text
sections will be squashed into one common section.
Thus no need to force these functions being always-inlined.

It's a rudiment from time when we were not using ld at
all but #include source code file itself and now this
attribute might confuse code readers since it's
unclear _why_ it's needed at all.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

There is no need for specific parasite or restorer
head sections, a general "head" one is enough.

Also .stack section is dropped since it's never used.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Otherwise I get

 | sockets.c: In function ‘dump_socket’:
 | sockets.c:467: error: ‘st.st_ino’ may be used uninitialized in this function
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Since kernel commit 9c501935a3 the sys/socket.h
should be included prior the linux/netlink.h.

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

It has been used when debuggin without PTRACE_SEIZE,
not needed anymore.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It's wrong to treat restore_thread_exec_start as arguments
area (I managed to overlook this problem in commit
01484182) it's rather
a function start address.

The thread arguments area allocated dynamically after the
restorer blob itself.

We didn't hit any problems earlier simply because there
were a few bytes owerwritten in function prologue.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
CC: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Otherwise I'm getting error
 |
 | files.c: In function ‘prepare_fds’:
 | files.c:329:23: error: ‘tmp’ may be used uninitialized in this function [-Werror=uninitialized]
 | files.c:309:6: note: ‘tmp’ was declared here
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: Pavel Emelyanov <xemul@parallels.com>

It's used only to check whether we should do file re-send and verify we've served
all the cliens. This can be replaced with proper list manipulations.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Since now we have local copies of a remove FDs we can dump socket queus without entering
a parasite code. This makes the code MUCH simpler.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

We have two checks for fd being a chrdev:

One to skip stdio-s that are termilans and
The other one for any fd being a /dev/null or other special device.

Clean this a little bit.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Move the preID generation from dump_one_fdinfo to make it look cleaner.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

A bugfix. Drained fds should be closed after we are done with them.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The statfs is not required, we now check for fd being a socket with S_IFSOCK.
The 2nd stat is just not needed, the caller provides stat info.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

One can be read from fd_parms.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This structure is actualy an fd parameter, so put it there. This will also
help with future patching.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Try meant that it might not be a socket, but with local fds we do know
it for sure.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Since we're able to simply drain file descriptors
we're interested in, just do that with parasite
help.

This changes the calling sequence a bit

 1) Collect file descriptors before parasite
    get intected the dumpee and remember them in
    local copy.

 2) Ask parasite to drain collected descriptrs
    into our space.

 3) Operate with file descriptors directly via fcntl
    calls and such.

Overall idea is to prepare ground for fowners
dumping which will be addressed in further patches.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Just implemented but not yet used in dumping procedure,
this will be addressed in further patches.

Note the space for file descriptors is statically allocated
in 8K arguments area, not on stack.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>