mirror of
https://github.com/checkpoint-restore/criu.git
synced 2026-01-23 10:16:41 +00:00
7ca6cc1eb2
So here it is. If root task dies on restore the roots yard dir remains unrmdired :( Since we already know its name, we can remove one from criu. By the time we get to this place the sub mount namespace(s) are already dead and yard dir is empty. But umounting should be done by tasks after successfull restore, so keep depopulation there. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
123 lines
3.5 KiB
C
123 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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unsigned sb_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 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 depopulate_roots_yard(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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extern int mntns_maybe_create_roots(void);
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extern void cleanup_mnt_ns(void);
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#endif /* __CR_MOUNT_H__ */
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