mirror of
https://github.com/checkpoint-restore/criu
synced 2025-08-31 06:15:24 +00:00
275740a71e
We gonna need it for inotify handle testing. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
#ifndef __CR_MOUNT_H__
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#define __CR_MOUNT_H__
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#include <sys/types.h>
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#include "asm/types.h"
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#include "list.h"
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struct proc_mountinfo;
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struct pstree_item;
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struct fstype;
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struct ns_id;
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/*
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* Structure to keep external mount points resolving info.
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*
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* On dump the key is the mountpoint as seen from the mount
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* namespace, the val is some name that will be put into image
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* instead of the mount point's root path.
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*
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* On restore the key is the name from the image (the one
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* mentioned above) and the val is the path in criu's mount
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* namespace that will become the mount point's root, i.e. --
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* be bind mounted to the respective mountpoint.
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*/
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struct ext_mount {
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struct list_head list;
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char *key;
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char *val;
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};
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struct mount_info {
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int mnt_id;
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int parent_mnt_id;
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unsigned int s_dev;
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char *root;
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/*
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* During dump mountpoint contains path with dot at the
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* beginning. It allows to use openat, statat, etc without
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* creating a temporary copy of the path.
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*
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* On restore mountpoint is prepended with so called ns
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* root path -- it's a place in fs where the namespace
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* mount tree is constructed. Check mnt_roots for details.
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* The ns_mountpoint contains path w/o this prefix.
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*/
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char *mountpoint;
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char *ns_mountpoint;
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unsigned flags;
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int master_id;
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int shared_id;
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struct fstype *fstype;
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char *source;
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char *options;
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union {
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bool mounted;
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bool dumped;
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};
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bool need_plugin;
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bool is_ns_root;
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bool deleted;
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struct mount_info *next;
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struct ns_id *nsid;
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struct ext_mount *external;
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bool internal_sharing;
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/* tree linkage */
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struct mount_info *parent;
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struct mount_info *bind;
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struct list_head children;
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struct list_head siblings;
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struct list_head mnt_bind; /* circular list of derivatives of one real mount */
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struct list_head mnt_share; /* circular list of shared mounts */
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struct list_head mnt_slave_list; /* list of slave mounts */
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struct list_head mnt_slave; /* slave list entry */
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struct mount_info *mnt_master; /* slave is on master->mnt_slave_list */
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struct list_head postpone;
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void *private; /* associated filesystem data */
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};
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extern struct mount_info *mntinfo;
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extern struct ns_desc mnt_ns_desc;
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extern struct mount_info *mnt_entry_alloc();
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extern void mnt_entry_free(struct mount_info *mi);
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extern int __mntns_get_root_fd(pid_t pid);
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extern int mntns_get_root_fd(struct ns_id *ns);
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extern int mntns_get_root_by_mnt_id(int mnt_id);
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extern struct ns_id *lookup_nsid_by_mnt_id(int mnt_id);
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extern int open_mount(unsigned int s_dev);
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extern int __open_mountpoint(struct mount_info *pm, int mnt_fd);
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extern struct fstype *find_fstype_by_name(char *fst);
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extern bool add_fsname_auto(const char *names);
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extern struct mount_info *collect_mntinfo(struct ns_id *ns, bool for_dump);
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extern int prepare_mnt_ns(void);
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extern int pivot_root(const char *new_root, const char *put_old);
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extern struct mount_info *lookup_overlayfs(char *rpath, unsigned int s_dev,
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unsigned int st_ino, unsigned int mnt_id);
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extern struct mount_info *lookup_mnt_id(unsigned int id);
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extern struct mount_info *lookup_mnt_sdev(unsigned int s_dev);
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extern dev_t phys_stat_resolve_dev(struct ns_id *, dev_t st_dev, const char *path);
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extern bool phys_stat_dev_match(dev_t st_dev, dev_t phys_dev,
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struct ns_id *, const char *path);
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extern int restore_task_mnt_ns(struct pstree_item *current);
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extern int fini_mnt_ns(void);
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extern char *rst_get_mnt_root(int mnt_id);
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extern int ext_mount_add(char *key, char *val);
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#endif /* __CR_MOUNT_H__ */
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