v2:
 - Pass initial counter value to eventfd call
   (can't pass flags here since they are obtained
    with fcntl and must be restored same way or
    restore will fail)
 - Use rst_file_params for flags and owner restore
 - Use eventfd.[ch] instead of eventfs.[ch]
 - Move show funcs to eventfd.c
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Will need it for eventpoll/eventfd/inotify.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This is also a code move plus two changes:

* shmems renamed to dump_shmems
* shmem area size is shared with restorer (it's one page for both for now)
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

No changes, just code move (and rename of shmems variable).
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Just a codemove, no real changed.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

Also convert all ino into %x format.
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>

We use mincore to check which pages we should take with us into
the image. The anonymour present or swapped should go, file present
but not cow-ed should not.

The mincore syscall wasn't very helpful with this -- it didn't detect
swap, but did detect some non present pages (pagecache). Plus it
didn't know anything about cow-ing filemaps.

Andrey Morton suggested to use the pagemap file in proc, but it lacked
the importaint stuff -- the cow filemap bit. Now it's there and we
can switch to using it.

The mincore usage for shared memory is still there, as for _that_ case
it's correct.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Dumped pages are those taken to the image
Skipped pages are those, sitting in RAM, but left there (file shared pages)
Total is the total amount of pages that fit into vmarea
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

* Split dump/restore options from show ones
* Structure the former list
* Add the --tcp-established one
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The wrong descriptor was passed to the read_img_buf.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

Calculate the best width for address and print them all with it.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

A few of our functions use buffer and string functions.
All these functions require that a string contains '\0' at the end.
Before this patch we didn't guarantee that.

I've seen segmentation fault in parse_pid_stat_small.

v2: simplify code
v3: remove assignment, because it's redundant and a size of object file
become bigger.
Signed-off-by: Andrey Vagin <avagin@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>

This test is very basic :( Need more work on it.
One note about --close arg to crtools -- bash leaves all
fds open when laucnhing progams, and for restore this is
critical, as one of them can be busy. Iterating over all
the possibel fds and closing them is "do not want" thing.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Only manual mode at the moment. Need to automate it later.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

What it does is uses the tcp repair engine from the kernel.

On dump the connection is locked with netfilter, socket is put
in the repair state and then its internals are dumped.

On restore we create a socket, put it into repair, dress it up
and then unlock all the connections at the very end.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

When dump finished with error we should unlock all locked
previously connections.

When restoring we should collect connctions and unlock them
all at the end.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Introduce the image file for tcp info, its entry and the show method.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Between dump and restore of a tcp conn we have to keep the connection
blocked, since the socket doesn't exists in the kernel at this time
and any packet from peer will result in RST. Thus, add the -j DROP rule
for every connection we're about to repair.

Later, when we support containers, this will be extended to stop the
whole networking in a CT instead of cherry-peeking connections.

It does system("iptables ...") for this, but I'd prefer using the
libnetfilter-devel sometime in the future.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

First of all -- to make crtools dump/restore established tcp sockets
you have to specify the --tcp-established options. By doing so you
inform crtools that

a) you know, that after dump there will be a netfilter rules blocking
   the dumped connections

b) you guarantee, that before restore this netfilter block is still
   there

What else this patch does is simple -- collects establised sockets and
calls the dump/restore tcp function (now empty) where appropriate.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

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

After reopen_fd_as the original fd is closed.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

Funny, but after this git thinks, that I've renamed the sockets.c
file into sk-unix.c one and fixed it a little bit %)
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

For simpler unix socket code move.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

For simpler unix socket code move.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

Rename the fn and fix indentation.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Collect all unix sockets in a list while dumping to check
whether we've missed something early (at the restore time
it can be already late for roll-back).

Plus, fix the checks for external stream sockets.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This is common, that opened fd fix its fowner and flags. Make
a cuntion for this. Those that obtain fd with open() don't need
to restore flags though.

A thought -- do we need yet another abstraction between fdinfo and
type-d files?
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The conn job misses fowner restoratio. Other places are ok, but toss
the code for easier next patching.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The kernel patch titled

	c/r: prctl: Simplify PR_SET_MM on mm::code/data assignment

(which now in linux-next) allows us to setup code/data addresses
without requirement of underlied VMA. So revert commit
090513d5 and make code
more simplier
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Kernel 3.4-rc4 has two formats for stack
"[stack]" and "[stack:%d]" (for threads)
so adopt our parsing routine for both.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

To reflect the change in kernel v3.4-rc4
update PR_GET_TID_ADDR and rename it to
PR_GET_TID_ADDRESS as it named in kernel.

[xemul: this fixes futex test broken with 3.4 rebase]
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Some of them (FC12 I debug on) doesn't have fown_ex stuff in their
libc. Add the missing declarations.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>