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https://github.com/checkpoint-restore/criu.git
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71a0b5dc31
When we are doing pre-dump, we splice pages in pipes and only then open images and dump pages. But when we are splicing pages, we need to know about existence of parent images. This patch adds a new call to determin existence of parent images. In addition this patch fixes a following issue: CID 83244 (#1 of 1): Uninitialized pointer read (UNINIT) 14. uninit_use: Using uninitialized value xfer.parent. v2: initialize unused field of struct page_server_iov, because it sends in network. CID 83451 (#1 of 1): Uninitialized scalar variable (UNINIT) 2. uninit_use_in_call: Using uninitialized value pi. Field pi.nr_pages is uninitialized when calling write. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
#ifndef __CR_PAGE_XFER__H__
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#define __CR_PAGE_XFER__H__
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#include "page-read.h"
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extern int cr_page_server(bool daemon_mode, int cfd);
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/*
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* page_xfer -- transfer pages into image file.
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* Two images backends are implemented -- local image file
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* and page-server image file.
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*/
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struct page_xfer {
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/* transfers one vaddr:len entry */
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int (*write_pagemap)(struct page_xfer *self, struct iovec *iov);
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/* transfers pages related to previous pagemap */
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int (*write_pages)(struct page_xfer *self, int pipe, unsigned long len);
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/* transfers one hole -- vaddr:len entry w/o pages */
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int (*write_hole)(struct page_xfer *self, struct iovec *iov);
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void (*close)(struct page_xfer *self);
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/* private data for every page-xfer engine */
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union {
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struct /* local */ {
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struct cr_img *pmi; /* pagemaps */
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struct cr_img *pi; /* pages */
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};
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struct /* page-server */ {
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int sk;
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u64 dst_id;
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};
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};
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struct page_read *parent;
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};
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extern int open_page_xfer(struct page_xfer *xfer, int fd_type, long id);
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struct page_pipe;
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extern int page_xfer_dump_pages(struct page_xfer *, struct page_pipe *,
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unsigned long off);
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extern int connect_to_page_server(void);
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extern int disconnect_from_page_server(void);
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extern int check_parent_page_xfer(int fd_type, long id);
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#endif /* __CR_PAGE_XFER__H__ */
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