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shmid contains a file id for file mappings. It's required to determine, which VMA-s are cowed. The parent maps a VMA and saves premmaped address. Then child trys to determing, which VMA-s must be inhereted from parent, for that it compares addresses, flags and file id. We don't want to transfer vma_area-s in restorer, so when a VMA entry is copied in restorer memory, the premmaped address is save in shmid. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
#ifndef __CR_VMA_H__
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#define __CR_VMA_H__
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#include "list.h"
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#include "protobuf/vma.pb-c.h"
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struct vm_area_list {
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struct list_head h;
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unsigned nr;
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unsigned long priv_size; /* nr of pages in private VMAs */
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unsigned long longest; /* nr of pages in longest VMA */
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};
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#define VM_AREA_LIST(name) struct vm_area_list name = { .h = LIST_HEAD_INIT(name.h), .nr = 0, }
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struct vma_area {
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struct list_head list;
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VmaEntry vma;
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union {
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int vm_file_fd;
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int vm_socket_id;
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};
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unsigned long *page_bitmap; /* existent pages */
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unsigned long *ppage_bitmap; /* parent's existent pages */
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unsigned long premmaped_addr;
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};
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extern int collect_mappings(pid_t pid, struct vm_area_list *vma_area_list);
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extern void free_mappings(struct vm_area_list *vma_area_list);
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extern bool privately_dump_vma(struct vma_area *vma);
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#define vma_area_is(vma_area, s) vma_entry_is(&((vma_area)->vma), s)
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#define vma_area_len(vma_area) vma_entry_len(&((vma_area)->vma))
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#define vma_entry_is(vma, s) (((vma)->status & (s)) == (s))
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#define vma_entry_len(vma) ((vma)->end - (vma)->start)
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/*
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* vma_premmaped_start() can be used only in restorer.
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* In other cases vma_area->premmaped_addr must be used.
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* This hack is required, because vma_area isn't tranfered in restorer and
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* shmid is used to determing which vma-s are cowed.
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*/
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#define vma_premmaped_start(vma) ((vma)->shmid)
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static inline int in_vma_area(struct vma_area *vma, unsigned long addr)
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{
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return addr >= (unsigned long)vma->vma.start &&
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addr < (unsigned long)vma->vma.end;
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}
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#endif /* __CR_VMA_H__ */
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