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mount: add mnt_bind_pick helper to pick the desired bind

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Adding different pick functions we would be able to search different
things like mounted bind with wider root, or external bind, or external
bind with same sharing group and so on and so forth.

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
This commit is contained in:
Pavel Tikhomirov
2021-11-29 12:54:51 +03:00
committed by Andrei Vagin
parent 9d1f39f28a
commit c09bd89419
2 changed files with 23 additions and 0 deletions
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2
criu/include/mount.h
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@@ -173,4 +173,6 @@ extern int remount_readonly_mounts(void);
extern int try_remount_writable(struct mount_info *mi, bool ns);
extern bool mnt_is_overmounted(struct mount_info *mi);
extern struct mount_info *mnt_bind_pick(struct mount_info *mi,
bool (*pick)(struct mount_info *mi, struct mount_info *bind));
#endif /* __CR_MOUNT_H__ */

21
criu/mount.c
View File

@@ -934,6 +934,27 @@ static void search_bindmounts(void)
__search_bindmounts(mi);
}
struct mount_info *mnt_bind_pick(struct mount_info *mi, bool (*pick)(struct mount_info *mi, struct mount_info *bind))
{
struct mount_info *bind;
BUG_ON(!mi);
if (pick(mi, mi))
return mi;
/*
* Shouldn't use mnt_bind list before it was populated in search_bindmounts
*/
BUG_ON(!mi->mnt_bind_is_populated);
list_for_each_entry(bind, &mi->mnt_bind, mnt_bind)
if (pick(mi, bind))
return bind;
return NULL;
}
static int resolve_shared_mounts(struct mount_info *info, int root_master_id)
{
struct mount_info *m, *t;