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Andrey Vagin 7c896efff5 page-xfer: receive information about presence of a parent from a page server (v2) 
We need to know this to insert holes. Currently xfer->parent isn't
initialized for remote sessions. In most cases it has a non-zero value,
so generate_iovs() is called with has_parent = true.

bash test/zdtm.sh -p -P -i 3 ns/transition/fork
(00.000106) Error (sysctl.c:194): Can't open sysctl net/ipv4/tcp_wmem: No such file or directory
(00.017048)    420: Error (image.c:231): Unable to open pagemap-420.img: No such file or directory
(00.017065)    420: Error (image.c:231): Unable to open pages-420.img: No such file or directory
(00.017090)    420: Error (page-read.c:73): No parent for snapshot pagemap
(00.017290)     86: Error (cr-restore.c:1185): 420 exited, status=1
(00.017317) Error (cr-restore.c:1831): Restoring FAILED.

v2: add a new command to open a page server. It's required to save
backward compatibility. If someone tries to use an old version of
page server, he will get an error.

Reported-by: Mr Jenkins
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2014-11-10 09:36:04 +04:00
arch dump: get tasks ids from parasite 2014-11-07 17:14:32 +04:00
contrib Add a convenience shell script for Docker container C/R 2014-09-09 16:08:22 +04:00
Documentation cpuinfo: Add "cpuinfo [dump|check]" commands, v2 2014-10-03 13:26:58 +04:00
include util: Fix the ispathsub corner case 2014-11-09 23:26:56 +04:00
lib restore: Introduce the --restore-sibling option 2014-09-10 18:30:30 +04:00
pie dump: get tasks ids from parasite 2014-11-07 17:14:32 +04:00
protobuf userns: define protobuf messages for uid and gid maps 2014-11-07 17:00:25 +04:00
scripts travis: add compilation of tests 2014-10-14 14:22:01 +04:00
test test: increase permissions for the "test" directory (v2) 2014-11-07 23:50:47 +04:00
.gitignore lib: Generate pkgconfig file 2014-08-04 13:57:18 +04:00
.mailmap repo: Add mailmap file 2012-03-25 23:31:20 +04:00
.travis.yml criu: add .travis.yml (v3) 2014-09-30 21:51:16 +04:00
action-scripts.c scripts: Add ACT_MAX limit and make @action_names being const 2014-10-27 21:30:37 +04:00
bfd.c bfd: Don't flush read-only images 2014-11-05 15:38:17 +04:00
cgroup.c cgroup: don't use fread in read_cgroup_prop() 2014-11-05 15:45:50 +04:00
COPYING Add LGPL licence for library directory 2013-04-01 12:29:06 +04:00
cr-check.c check: return non-zero code if PR_SET_MM_MAP is unsupported 2014-11-10 09:35:19 +04:00
cr-dedup.c img: Introduce the struct cr_img 2014-09-30 21:48:13 +04:00
cr-dump.c dump: dump user namespaces (v2) 2014-11-07 17:16:16 +04:00
cr-exec.c dump: remove useless arguments from seize_task() 2014-11-07 17:14:54 +04:00
cr-restore.c userns: restore per-namespace mappings of user and group IDs (v4) 2014-11-07 17:16:40 +04:00
cr-service.c cpuinfo: rpc -- Add CPUINFO_DUMP/CPUINFO_CHECK commands, v2 2014-10-03 13:27:00 +04:00
cr-show.c criu: add constants about user namespaces 2014-11-07 17:00:32 +04:00
CREDITS Add the CREDITS file 2012-07-30 13:52:37 +04:00
crtools crtools: rename binary to criu 2013-04-30 20:17:55 +04:00
crtools.c dump: pre-load kernel modules 2014-10-14 14:21:05 +04:00
eventfd.c img: Rename fdset -> imgset 2014-09-30 21:48:10 +04:00
eventpoll.c img: Rename fdset -> imgset 2014-09-30 21:48:10 +04:00
fifo.c img: Introduce the struct cr_img 2014-09-30 21:48:13 +04:00
file-ids.c files-ids: generate id-s accoding with mnt_id, st->st_dev and st->st_ino 2014-04-21 22:39:28 +04:00
file-lock.c img: Introduce the struct cr_img 2014-09-30 21:48:13 +04:00
files-ext.c img: Introduce the struct cr_img 2014-09-30 21:48:13 +04:00
files-reg.c userns: save uid-s from a target userns (v2) 2014-11-07 17:15:45 +04:00
files.c restore: don't leak a transport socket 2014-11-05 15:45:33 +04:00
fsnotify.c img: Rename fdset -> imgset 2014-09-30 21:48:10 +04:00
image-desc.c criu: add constants about user namespaces 2014-11-07 17:00:32 +04:00
image.c bfd: Don't flush read-only images 2014-11-05 15:38:17 +04:00
ipc_ns.c ipc_ns: don't leak memory 2014-11-05 15:46:46 +04:00
irmap.c irmap: Get root mntfd before releasing tasks on predump 2014-10-01 09:37:04 +04:00
kcmp-ids.c kcmp: Fix ret code comparison 2014-04-22 12:51:15 +04:00
kerndat.c kerndat: Transform kerndat_get_devpts_stat into general form 2014-10-30 15:10:31 +04:00
libnetlink.c netlink: Lower netlink error report log level 2013-07-04 15:49:02 +04:00
log.c restore: open the pidfile with O_EXCL 2014-09-03 20:58:24 +04:00
Makefile test: clean the "test" directory from test/Makefile 2014-09-02 16:10:55 +04:00
Makefile.config crtools: check for setproctitle_init 2014-09-02 16:14:39 +04:00
Makefile.crtools bfd: File-descriptors based buffered read 2014-09-23 20:48:38 +04:00
Makefile.inc install: install criu-service logrotate config 2014-02-18 12:39:50 +04:00
mem.c rst: Rework the rst_info referencing 2014-10-01 13:34:38 +04:00
mount.c mnt: Introduce and use issubpath helper 2014-11-07 17:39:23 +04:00
namespaces.c ns: Fix compilation on Fedora-19 2014-11-07 17:23:17 +04:00
net.c net: Use ns walking helper 2014-10-14 18:01:38 +04:00
netfilter.c iptables: use cr_system instead of system 2013-10-02 20:09:37 +04:00
page-pipe.c log: Use pr_quelled helper 2014-09-03 20:56:58 +04:00
page-read.c img: Introduce the struct cr_img 2014-09-30 21:48:13 +04:00
page-xfer.c page-xfer: receive information about presence of a parent from a page server (v2) 2014-11-10 09:36:04 +04:00
pagemap-cache.c pagemap-cache: Use page.h helpers 2014-02-21 16:29:41 +04:00
parasite-syscall.c dump: get tasks ids from parasite 2014-11-07 17:14:32 +04:00
pipes.c img: Introduce the struct cr_img 2014-09-30 21:48:13 +04:00
plugin.c plugin: Rework plugins API, v2 2014-09-03 20:48:36 +04:00
proc_parse.c proc: delete parse_pid_stat_small() (v2) 2014-11-07 17:15:37 +04:00
protobuf-desc.c criu: add constants about user namespaces 2014-11-07 17:00:32 +04:00
protobuf.c img: Prepare to use bfd engine 2014-09-30 21:48:53 +04:00
pstree.c namespaces: take into account USERNS id 2014-10-30 16:00:33 +04:00
ptrace.c dump: move the may_dump() check in seize_task() 2014-11-07 17:15:29 +04:00
rbtree.c code: Fix spaced indentation where found 2012-08-11 21:36:03 +04:00
README Update README file so that it looks more informative on github front page 2014-01-24 20:42:08 +04:00
rst-malloc.c whitespace-at-eol cleanup 2013-12-12 10:00:45 +04:00
sd-daemon.c systemd socket activation support 2013-12-12 09:58:50 +04:00
sd-daemon.h systemd socket activation support 2013-12-12 09:58:50 +04:00
security.c dump: get tasks ids from parasite 2014-11-07 17:14:32 +04:00
shmem.c shmem: don't unmap a memrory region in restore_shmem_content() 2014-11-05 15:45:03 +04:00
sigframe.c sigframe: cast the pointer to the field ucontext::uc_sigmask to k_rtsigset_t 2014-04-08 15:36:09 +04:00
signalfd.c img: Rename fdset -> imgset 2014-09-30 21:48:10 +04:00
sk-inet.c sk-inet: don't leak sockets 2014-11-05 15:46:39 +04:00
sk-netlink.c img: Rename fdset -> imgset 2014-09-30 21:48:10 +04:00
sk-packet.c img: Rename fdset -> imgset 2014-09-30 21:48:10 +04:00
sk-queue.c img: Introduce the struct cr_img 2014-09-30 21:48:13 +04:00
sk-tcp.c img: Introduce the struct cr_img 2014-09-30 21:48:13 +04:00
sk-unix.c userns: save uid-s from a target userns (v2) 2014-11-07 17:15:45 +04:00
sockets.c dump: pre-load kernel modules 2014-10-14 14:21:05 +04:00
stats.c img: Introduce the struct cr_img 2014-09-30 21:48:13 +04:00
string.c string: Add strlcat helper 2013-11-29 15:36:07 +04:00
sysctl.c add int(CTL_32) 2014-10-08 19:23:24 +04:00
sysfs_parse.c sysfs: fix use_after_free issue 2014-11-05 15:44:34 +04:00
timerfd.c img: Rename fdset -> imgset 2014-09-30 21:48:10 +04:00
tty.c tty: Fix compilation warrning 2014-10-30 16:24:15 +04:00
tun.c tun: rename FD_TYPES__TUN to FD_TYPES__TUNF 2014-10-27 21:52:40 +04:00
util.c cg: use one path style throughout cg restore code 2014-10-07 12:56:52 +04:00
uts_ns.c ns: Factor out namespace switching call 2014-09-30 21:54:11 +04:00

README 

criu
====

An utility to checkpoint/restore tasks. Using this tool, you can
freeze a running application (or part of it) and checkpoint it to
a hard drive as a collection of files. You can then use the files
to restore and run the application from the point it was frozen
at. The distinctive feature of the CRIU project is that it is
mainly implemented in user space.

The project home is at http://criu.org

Pages worth starting with are
* Kernel configuration, compilation, etc: http://criu.org/Installation
* A simple example of usage: http://criu.org/Simple_loop
* More sophisticated example with graphical app: http://criu.org/VNC