One of such things we use right now is the device for anon shmem
mappings backing. In the furure this can be extended to check for
various kernel features.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This one is a little bit more tricky that dump. On restore we
should open the chain of pagemap-s (by "parent" links). Then for
every pagemap with in_parent set we should go to parent and ask
for the page. Parent, in turn, should properly determine where
the respective page is in his pagemap and position the page.img's
position respectively.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
1. Directory with images may have a "parent" symlink pointing to the
place where the previous snapshot is
2. Each pagemap will have "in_parent" bit, which means, that the
pages for this pagemap entry are not in the respective page.img
but in parent
3. New --leave-running option to use with --snapshot not to kill
tasks after snapshot
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Now we have 2 forms of storing pages -- legacy pages.img and
new pagemap + pages image. We'll have one more (ovz) and the
pagemap + pages will be stacked (snapshot restore). Thus it's
handy to have this as an page-reader object.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
The pagemap.img contains sorted iovs. Need to keep this array also
sorted even if holes are in there for simpler read on restore.
Separate ->write_hole callback since dump of hole and non-hole
will differ significantly.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Holes are regions, that don't have pages in them (i.e. -- no
pages in pipes). These holes are in separate iovs array since
we should have straight arrays of iovs for non-holes, which is
in turd required to push it into vmsplice in _one_ chunk.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Information about mount points is used for dumping fanotify.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
The fd in -> open callback is temporary (the files restoring
engine will re-open one under some other fd). But since we
add this fd to future repair off, this off will fail working
on wrong fd.
Move scheduling for repair-off into port-open where the corrent
fd is known.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
We use pr_perror, but after direct syscall calling the
errno is not initialized (and in PIE it doesn't even exists).
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
mnt_entry contains a few strings and they should be release too
CID 996198 (#4 of 4): Resource leak (RESOURCE_LEAK)
20. leaked_storage: Variable "pm" going out of scope leaks the storage
it points to.
CID 996190 (#1 of 1): Resource leak (RESOURCE_LEAK)
13. leaked_storage: Variable "new" going out of scope leaks the storage
it points to.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
hlist is suitable for hash operations so
extent list.h code. I need it for converter
and this allow me to reuse this header.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This header consists of a number of constants
and a few macro helper. No need to make it
asm/types.h dependant. Instead only include
<stdbool.h> for bool definition as required
by forward fdinfo_per_id (I think this declaration
should live in somewhere else place, not sure
where yet, so I left it untouched).
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Instead of bloating util.h lets move ERR_
helpers to own err.h header. This allow
to reuse it where needed without util.h
inclusion.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Show only image info relevant to given pid. Also reuse
the introduced --pid argument for exec action.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
VMA-s may be protected against read, so rights for such VMA-s should be
changed for dumping and protected back after dumping.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
The idea is simple. If the collection of given type of sockets failed,
crtools can't be sure, that it's able to dump such sockets correctly.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
After reworkring the way pagemap is stored the backward compatibility
was not preserved for patches simplicity. Time to return it back.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
All info about bound sockets are got via socket diag interface.
All connected sockets are automatically bound.
For other sockets only protocol must be dumped, which is got
with help getsockopt.
A netlink sockets with pending data are not supported yet and
probably will not be supported in a near future.
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Each zombie sends SIGCHLD to parent. crtools restores all pending
signals, so all other signals should be collected.
Here is a problems, that signals SIGCHLD can be merged, but crtools
should be sure, that all signals are collected.
For that a zombie locks a global zombie_lock, which is released by
parent.
This operation should be done between CR_STATE_RESTORE and
CR_STATE_RESTORE_SIGCHLD.
Here is one more CR_STATE_RESTORE_ZOMBIES, whic is used for waiting all
zombies.
v2: clean up
v3: rework synchronization
v4: rework without additional CR_STATE-s
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Read siginfo-s from images and send them to itself by sigqueueinfo.
Thread signals cannot be restored in restore_thread_common, because
it blocks SIGCHLD, which used for error detecting.
v2: Don't remap task_args and thread_args
v3: fix error handling
v4: cosmetic clean up
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
PTRACE_PEEKSIGINFO is used for received pending signals,
then all signal are sent back and saved in a image.
v2: rework according with the new kernel interface
v3: rework according with the newrest kernel interface
v4: fix error handling
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
