The unique id is 32 bit and consists only of the subid value. This
is _really_ enough. The genid part is just a hint for the tree-search
algirythm to avoid unneeded sys_kcmp calls.

Plus, generate IDs for special files. This will make it easier to
move the regfiles into into separate files (see the respective patch
for details).
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Use the open_fe_fd everywhere to obtain an fd from image.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

It is u32 and that is it :\
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Just for debugging. Useful to know how the tree was built
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

The subtree node should be linked with common rbtree procedure. Otherwise
the very first subtree insertion results in an infinite loop in the rb
linking and balancing code.

Plus, mark the root as static and add the subroot node initialization check.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Check for files with equal paths are handled"
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It's actually useless for user, this field is for crtools only to
find out when one fdinfo entry ends and the new one starts.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

Open the exec link at fd restore stage as yet another service fd,
then pass it to restover via args and just call prctl on it.

This is good for several reasons -- the amount of code required for
this is less and opening files should better happen before we switch
to restorer (opening will be complex and it's MUCH easier to open all
we need in one place).
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

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

Hide the structure - it's not required.

[ xemul: Ranem long id into u32 id and adopt to current tree ]
Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This is a precursor patch. Macro for max possible fd type will be required.
And it's easier to use enum in this case.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

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

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

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

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

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

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

This is a cleanup patch. This tree is merged only once. So it's image file can
be opened by opne_image() call and dumped right after collect stage.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Since the collect_shmems updates start address for vmas, for
two shared mappings in one task we'll try to dup() the 1st
restoration attempt, since the si's start will be set to the
2nd one, which is not yet restored.

Thus we should map-and-open the first one being restored, not
the one with matched address and dup() all the rest.

[avagin@: There's no such thing, since the collect stage checks
for pid being less _or_ _equal_ and this only the first vma's start
will be saved. But anyway, this makes it more obvious.]
Acked-by: Andrey Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

Just make the fixup_vma_fds read and write vma images and
those called by it provide and fd for this.
Acked-by: Andrey Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

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

The core image now contains only core per-task stuff.
The new file resurrects Tula magic number removed earlier.
Acked-by: Andrey Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This routine will be used more widely and we will
be generating sockets with name based on some predefined
unique value rather than 'pid', so name argument this
way.

No change on functional level.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

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

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

It's a rudiment from old times, when restore worked via ececve.
Now we modify the core file in place to fixup vma-s.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Now it has only one descritor for dumping pages

v2: remove rudiments
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

vma_entry contains shmid and all shared memory are dumped in own files.
The most interesting thing is restore.
A maping is restored by process with the smallest pid. The mamping
is created before executing restorer.
We map a full mapping and restore it's conten, then we open a file from
/proc/pid/map_files and store a descriptor in vma_info. The mapping is
unmaped. Now we can map any region of this mapping in the restorer.

We use this trick, because a target process may have this mapping in
some places and the restorer has not function to open proc files.

v2: fix error hangling
xemul: Fixed static-s and args for cr_dump_shmem
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Because 0 is actually a valid value.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

It will be used to restore shared mappings

v2: clean up
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

* map a big memory region
* fork
* unmap the first and tenth pages
* remap one page in another place
* touch a few pages
* check content of touched pages
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Now a name of an image file is hard coded ("smth-%d.img", pid),
but the images of namespaces, shared memery, etc belong to
not one task, so they may have other formats of names, which
will describe objects.

For example a image of shared memory content may have name like
this ("pages-shmem-%ld.img", shmid)

v2: fix comment
v3: rebase
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

This patch makes crtools to work with new /proc/pid/exe symlink
restoration (the kernel part was reviewed by Oleg).

So this patch is for new shiny kernel only (!), thus I suggest
all developers to move on kernel crtools-3.3 (which can be
found at usual place) and pick up this patch for crtools itself.

(again, with this patch anything but crtools-3.3 will not work)
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>