mirror of
https://github.com/checkpoint-restore/criu.git
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6217a84ae3
When we're restoring fsnotify watchees we need to resolve path to a handle at some mountpoint referred by @s_dev member (device ID) which is saved inside image. This ID actually may be changed at the every mount (say one restores container after machine reboot) or in case of container's migration. Thus the test for overmounting in __open_mountpoint will fail and we get an error. Lets do a trick: introduce @s_dev_rt member which is supposed to carry run-time device ID. When dumping this member simply equal to traditional @s_dev fetched from the procfs, but when restoring we fetch it from stat call once mountpoint become alive. https://jira.sw.ru/browse/PSBM-41610 v2: - predefine MOUNT_INVALID_DEV - use fetch_rt_stat instead of assigning device in restore_shared_options - copy @s_dev_rt in propagate_siblings and propagate_mount Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
129 lines
3.7 KiB
C
129 lines
3.7 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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#define MOUNT_INVALID_DEV (0)
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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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unsigned int s_dev_rt;
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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 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 void fini_restore_mntns(void);
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extern int depopulate_roots_yard(void);
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extern int rst_get_mnt_root(int mnt_id, char *path, int plen);
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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 int read_mnt_ns_img(void);
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extern void cleanup_mnt_ns(void);
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#endif /* __CR_MOUNT_H__ */
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