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https://github.com/checkpoint-restore/criu.git
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08c204820f
When AIO context is set up kernel does two things: 1. creates an in-kernel aioctx object 2. maps a ring into process memory The 2nd thing gives us all the needed information about how the AIO was set up. So, in order to dump one we need to pick the ring in memory and get all the information we need from it. One thing to note -- we cannot dump tasks if there are any AIO requests pending. So we also need to go to parasite and check the ring to be empty. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
93 lines
2.5 KiB
C
93 lines
2.5 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 int nr_aios;
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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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static inline void vm_area_list_init(struct vm_area_list *vml)
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{
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INIT_LIST_HEAD(&vml->h);
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vml->nr = 0;
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vml->priv_size = 0;
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vml->longest = 0;
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}
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struct file_desc;
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struct vma_area {
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struct list_head list;
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VmaEntry *e;
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union {
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struct /* for dump */ {
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union {
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/*
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* These two cannot be assigned at once.
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* The file_fd is an fd for a regular file and
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* the socket_id is the inode number of the
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* mapped (PF_PACKET) socket.
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*
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* The aio_nr_req is only for aio rings.
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*/
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int vm_file_fd;
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int vm_socket_id;
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unsigned int aio_nr_req;
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};
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char *aufs_rpath; /* path from aufs root */
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char *aufs_fpath; /* full path from global root */
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/*
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* When several subsequent vmas have the same
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* dev:ino pair all 'tail' ones set this to true
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* and the vmst points to the head's stat buf.
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*/
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bool file_borrowed;
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struct stat *vmst;
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int mnt_id;
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};
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struct /* for restore */ {
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struct file_desc *vmfd;
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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; /* restore only */
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};
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};
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};
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extern struct vma_area *alloc_vma_area(void);
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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)->e, s)
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#define vma_area_len(vma_area) vma_entry_len((vma_area)->e)
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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->e->start &&
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addr < (unsigned long)vma->e->end;
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}
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#endif /* __CR_VMA_H__ */
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