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criu/include/namespaces.h

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crtools: Namespaces support skeleton New option -n to dump/restore namespaces. Fork the namespaces dumping task and write a helper for switching a namespace. Prepare the restorer code for restoring namespaces before root task. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
2012-01-26 15:27:00 +04:00
#ifndef __CR_NS_H__
#define __CR_NS_H__
namespaces: dump_namespaces get a struct pid as argument It uses pid for create image file and real_pid for dumping ns-s. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-06-19 15:53:00 +04:00
ns: Add c/r for /proc/$pid/ns/$ids references Based on work done by Cyrill Corcunov (many thanks for that). In this commit we implement c/r for files which have opened /proc/$pid/ns/$ids entries. The idea is rather simple one Checkpoint ========== - Check if the file name is the one of known to be ns ref - If match then write protobuf entry Restore ======= - Read all ns entries from the image - When criu tries to open one we lookup over process tree to figure out which PID should be used in path and then just open it Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-05-18 04:00:05 +04:00
#include "files.h"
namespaces: dump_namespaces get a struct pid as argument It uses pid for create image file and real_pid for dumping ns-s. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-06-19 15:53:00 +04:00
ns: Introduce ns descriptors These are structs that (now) tie together ns string and the CLONE_ flag. It's nice to have one (some code becomes simpler) and will help us with auto-namespaces detection. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-01-15 23:24:01 +04:00
struct ns_desc {
ns: Beautify namespaces.h I'll need to modify this header so before anything else lets beautify it - drop struct pstree_item declaration it's already in pstree.h - move struct cr_options to top - align members of struct ns_desc - move externs to top - add argument name to try_show_namespaces Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-05-15 00:37:44 +04:00
unsigned int cflag;
char *str;
ns: Extend ns_desc to carry the length of the ns name This will be needed for fast parsing of procfs ns references. [ xemul: Add user_ns_desc here ] Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-05-20 13:30:17 +04:00
size_t len;
ns: Introduce ns descriptors These are structs that (now) tie together ns string and the CLONE_ flag. It's nice to have one (some code becomes simpler) and will help us with auto-namespaces detection. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-01-15 23:24:01 +04:00
};
namespace: move struct ns_id into namespace.h It's going to be used for restoring namespaces. For example we need to enumirate the ns_ids list for restoring mount namespaces. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2014-03-11 19:18:00 +04:00
struct ns_id {
unsigned int kid;
unsigned int id;
pid_t pid;
struct ns_desc *nd;
struct ns_id *next;
crtools: restore nested mount namespaces (v2) Known issue: * currently only namespaces with the same root is supported * nested namespaces can be dumped and restored only if the root task has own mount namespace. All nested namespaces are restored in a root namespace in temporary directories. All mount points restored in one tree and then they are divided into namesaces. The task with minimal pid for each namespaces unshared mntns and then it makes pivot_root in a proper temporary directory. All other tasks makes setns to enter into a mount namespace of the task with minimal pid. v2: clean up Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2014-04-21 18:23:20 +04:00
futex_t created; /* boolean */
namespace: move struct ns_id into namespace.h It's going to be used for restoring namespaces. For example we need to enumirate the ns_ids list for restoring mount namespaces. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2014-03-11 19:18:00 +04:00
};
extern struct ns_id *ns_ids;
ns: Extend ns_desc to carry the length of the ns name This will be needed for fast parsing of procfs ns references. [ xemul: Add user_ns_desc here ] Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-05-20 13:30:17 +04:00
#define NS_DESC_ENTRY(_cflag, _str) \
{ \
.cflag = _cflag, \
.str = _str, \
.len = sizeof(_str) - 1, \
}
ns: Add c/r for /proc/$pid/ns/$ids references Based on work done by Cyrill Corcunov (many thanks for that). In this commit we implement c/r for files which have opened /proc/$pid/ns/$ids entries. The idea is rather simple one Checkpoint ========== - Check if the file name is the one of known to be ns ref - If match then write protobuf entry Restore ======= - Read all ns entries from the image - When criu tries to open one we lookup over process tree to figure out which PID should be used in path and then just open it Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-05-18 04:00:05 +04:00
extern bool check_ns_proc(struct fd_link *link);
ns: Beautify namespaces.h I'll need to modify this header so before anything else lets beautify it - drop struct pstree_item declaration it's already in pstree.h - move struct cr_options to top - align members of struct ns_desc - move externs to top - add argument name to try_show_namespaces Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-05-15 00:37:44 +04:00
extern struct ns_desc pid_ns_desc;
ns: Extend ns_desc to carry the length of the ns name This will be needed for fast parsing of procfs ns references. [ xemul: Add user_ns_desc here ] Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-05-20 13:30:17 +04:00
extern struct ns_desc user_ns_desc;
ns: Beautify namespaces.h I'll need to modify this header so before anything else lets beautify it - drop struct pstree_item declaration it's already in pstree.h - move struct cr_options to top - align members of struct ns_desc - move externs to top - add argument name to try_show_namespaces Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-05-15 00:37:44 +04:00
extern unsigned long current_ns_mask;
files: Compact the code by removing per-file dump helpers Since *all* of them just call do_dump_gen_file with proper ops, just call one directly. Compacts the code. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-06-14 00:11:08 +04:00
extern const struct fdtype_ops nsfile_dump_ops;
collect: Shorten common images collecting code Now we have a set of cinfo-s, it's possible to collect all this stuff in a plan for-loop. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-08-21 03:52:18 +04:00
extern struct collect_image_info nsfile_cinfo;
ns: Add c/r for /proc/$pid/ns/$ids references Based on work done by Cyrill Corcunov (many thanks for that). In this commit we implement c/r for files which have opened /proc/$pid/ns/$ids entries. The idea is rather simple one Checkpoint ========== - Check if the file name is the one of known to be ns ref - If match then write protobuf entry Restore ======= - Read all ns entries from the image - When criu tries to open one we lookup over process tree to figure out which PID should be used in path and then just open it Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-05-18 04:00:05 +04:00
headers: Add extern specificator to functions We really have a mess of extern/non-extern declaration of functions in our headers. Always use extern for unification purpose. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-11-15 14:04:48 +04:00
extern int dump_namespaces(struct pstree_item *item, unsigned int ns_flags);
extern int prepare_namespace(struct pstree_item *item, unsigned long clone_flags);
extern int try_show_namespaces(int pid);
ns: Beautify namespaces.h I'll need to modify this header so before anything else lets beautify it - drop struct pstree_item declaration it's already in pstree.h - move struct cr_options to top - align members of struct ns_desc - move externs to top - add argument name to try_show_namespaces Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-05-15 00:37:44 +04:00
headers: Add extern specificator to functions We really have a mess of extern/non-extern declaration of functions in our headers. Always use extern for unification purpose. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-11-15 14:04:48 +04:00
extern int switch_ns(int pid, struct ns_desc *nd, int *rst);
extern int restore_ns(int rst, struct ns_desc *nd);
headers: Unify include guards (in comments) and a few fixes - fix names in comments - add empty lines where needed - fix rbtree.h - fix syscall-types.h Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-12-25 22:40:24 +04:00
headers: Add extern specificator to functions We really have a mess of extern/non-extern declaration of functions in our headers. Always use extern for unification purpose. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-11-15 14:04:48 +04:00
extern int dump_task_ns_ids(struct pstree_item *);
restore: add mount id-s in the ns_ids list (v4) Currently ns_ids list is filled only on dump. Soon we'll need this list for mount namespaces on restore, e.g. to know which tasks share the namespaces. v2: merge the patch "namespace: add a function to search an ns_id item by id" into this one. v3: add prefix rst_ to add_ns_id v4: look up namespace by two values -- type AND ID Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2014-04-21 18:23:14 +04:00
extern int rst_add_ns_id(unsigned int id, pid_t pid, struct ns_desc *nd);
extern struct ns_id *lookup_ns_by_id(unsigned int id, struct ns_desc *nd);
pre-dump: Collect mount info, root and nsmask Well, we want to pre-dump files (fsnotifies), for that we will need mountinfo-s and root, and for the latter -- the current ns mask. The problem with current ns mask is that its generation is incorporated into ns IDs generation and dumping. And since the ids dumping is not performed on pre-dump, let's just provide a helper for ns-mask generation. Strictly speaking, the whole ns-mask idea is not great, but it's to be fixed later. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2014-01-30 13:48:00 +04:00
extern int gen_predump_ns_mask(void);
core: Save tasks' namespaces IDs in the ids image The recent kernels allow to get namespaces IDs by reading proc-ns links. Use this to generate IDs for tasks' namespaces (I do generate them, since IDs provided by kernel look ugly :( ). Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2013-01-18 13:18:33 +04:00
headers: Unify include guards (in comments) and a few fixes - fix names in comments - add empty lines where needed - fix rbtree.h - fix syscall-types.h Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
2012-12-25 22:40:24 +04:00
#endif /* __CR_NS_H__ */
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