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  1. 26 Dec, 2014 3 commits
    • Pavel Emelyanov's avatar
      aio: Restore AIO contexts · 2694a74a
      Pavel Emelyanov authored 
      Restoring AIO is quite simple. Once all VMAs are put in
their places we can call io_setup() to let kernel create
the context back and then move the ring into proper place.

Another thing we should "restore" is the context ID. But
the thing is, upon ring creation kernel repots the ring
start address as this ID. And there's a patch in the -next
tree that changes the ID when we remap the ring. That
said after AIO context creation and ring remap we need
to check that the new ID is seen by the kernel.
Signed-off-by: 's avatarPavel Emelyanov <xemul@parallels.com>
      2694a74a
    • Pavel Emelyanov's avatar
      aio: Dump AIO rings · 08c20482
      Pavel Emelyanov authored 
      When AIO context is set up kernel does two things:

1. creates an in-kernel aioctx object
2. maps a ring into process memory

The 2nd thing gives us all the needed information
about how the AIO was set up. So, in order to dump
one we need to pick the ring in memory and get all
the information we need from it.

One thing to note -- we cannot dump tasks if there
are any AIO requests pending. So we also need to
go to parasite and check the ring to be empty.
Signed-off-by: 's avatarPavel Emelyanov <xemul@parallels.com>
      08c20482
    • Pavel Emelyanov's avatar
      x86: Add io syscalls · 80cf0426
      Pavel Emelyanov authored 
      Signed-off-by: 's avatarPavel Emelyanov <xemul@parallels.com>
      80cf0426
  3. 25 Dec, 2014 4 commits
  5. 24 Dec, 2014 2 commits
  7. 22 Dec, 2014 13 commits
  9. 19 Dec, 2014 10 commits
  11. 17 Dec, 2014 3 commits
  13. 11 Dec, 2014 1 commit
  15. 10 Dec, 2014 4 commits
    • Saied Kazemi's avatar
      tests: Pipe.c Test Program · 54081aff
      Saied Kazemi authored 
      Hi Saied,

This patch adds your test in the criu test system.
Signed-off-by: 's avatarAndrey Vagin <avagin@openvz.org>
Signed-off-by: 's avatarPavel Emelyanov <xemul@parallels.com>
      54081aff
    • Andrey Vagin's avatar
      zdtm/cwd00: avoid resolving an abs path · e12fd8f9
      Andrey Vagin authored 
      We may not have permissions for this.
Reported-by: 's avatarRuslan Kuprieiev <kupruser@gmail.com>
Cc: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: 's avatarAndrey Vagin <avagin@openvz.org>
Signed-off-by: 's avatarPavel Emelyanov <xemul@parallels.com>
      e12fd8f9
    • Ruslan Kuprieiev's avatar
      zdtm: add ip.dump and ip.rst to gitignore · 8f71344c
      Ruslan Kuprieiev authored 
      Signed-off-by: 's avatarRuslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: 's avatarPavel Emelyanov <xemul@parallels.com>
      8f71344c
    • Saied Kazemi's avatar
      Add inherit fd support · 0412152f
      Saied Kazemi authored 
      There are cases where a process's file descriptor cannot be restored
from the checkpoint images.  For example, a pipe file descriptor with
one end in the checkpointed process and the other end in a separate
process (that was not part of the checkpointed process tree) cannot be
restored because after checkpoint the pipe will be broken.

There are also cases where the user wants to use a new file during
restore instead of the original file at checkpoint time.  For example,
the user wants to change the log file of a process from /path/to/oldlog
to /path/to/newlog.

In these cases, criu's caller should set up a new file descriptor to be
inherited by the restored process and specify the file descriptor with the
--inherit-fd command line option.  The argument of --inherit-fd has the
format fd[%d]:%s, where %d tells criu which of its own file descriptors
to use for restoring the file identified by %s.

As a debugging aid, if the argument has the format debug[%d]:%s, it tells
criu to write out the string after colon to the file descriptor %d.  This
can be used, for example, as an easy way to leave a "restore marker"
in the output stream of the process.

It's important to note that inherit fd support breaks applications
that depend on the state of the file descriptor being inherited.  So,
consider inherit fd only for specific use cases that you know for sure
won't break the application.

For examples please visit http://criu.org/Category:HOWTO.

v2: Added a check in send_fd_to_self() to avoid closing an inherit fd.
    Also, as an extra measure of caution, added checks in the inherit fd
    look up functions to make sure that the inherit fd hasn't been reused.
    The patch also includes minor cosmetic changes.
Signed-off-by: 's avatarSaied Kazemi <saied@google.com>
Signed-off-by: 's avatarPavel Emelyanov <xemul@parallels.com>
      0412152f