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blcrcheckpointcontainercontainerscriudmtcphighly-availablelinuxmemory-trackingmigrationparasitepost-copyrestoresnapshotsuspenduserfaultfdzero-downtime
b146fe4af6
The watch target might be a deleted file. In this case we can't re-create it on restore procedure. A typical scenario ------------------ fd = inotify_init1() wd = open(path) inotify_add_watch(path) unlink(path) ... checkpoint ... here we have a @path which is unlinked but still present in inotify watch list because inode is not yet freed. And if the program is killed after checkpoint the last reference to a path get eliminated and inode get freed from the kernel memory. Thus any furher attempts to open the path via file handle (note that file handle can't be used to create new file, the kernel doesn't permit that) will simply fail. So if plain opening via file handle failed we assume that at least the file might be in our ghost files list (we're optimists, right?) and if we successed we simply use a path generated by ghost file engine for us. v2 [by xemul@]: - gather reference to ghost file remap early Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com> |
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| arch/x86 | ||
| Documentation | ||
| include | ||
| pie | ||
| protobuf | ||
| test | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| cr-check.c | ||
| cr-dump.c | ||
| cr-restore.c | ||
| cr-show.c | ||
| CREDITS | ||
| crtools.c | ||
| eventfd.c | ||
| eventpoll.c | ||
| fifo.c | ||
| file-ids.c | ||
| files-reg.c | ||
| files.c | ||
| image.c | ||
| inotify.c | ||
| ipc_ns.c | ||
| kcmp-ids.c | ||
| libnetlink.c | ||
| log.c | ||
| Makefile | ||
| mount.c | ||
| namespaces.c | ||
| net.c | ||
| netfilter.c | ||
| parasite-syscall.c | ||
| pipes.c | ||
| proc_parse.c | ||
| protobuf.c | ||
| pstree.c | ||
| ptrace.c | ||
| rbtree.c | ||
| README | ||
| shmem.c | ||
| signalfd.c | ||
| sk-inet.c | ||
| sk-packet.c | ||
| sk-queue.c | ||
| sk-tcp.c | ||
| sk-unix.c | ||
| sockets.c | ||
| sysctl.c | ||
| tty.c | ||
| util-net.c | ||
| util.c | ||
| uts_ns.c | ||
crtools ======= An utility to checkpoint/restore tasks. Some code snippets are borrowed from - Linux kernel (http://kernel.org/) - git (http://git-scm.com/) - kvm-tools (https://github.com/penberg/linux-kvm) - ptrace-parasite (https://code.google.com/p/ptrace-parasite/) Many thanks to these projects. Licensed under GPLv2 (http://www.gnu.org/licenses/gpl-2.0.txt)