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files: add ability to set callbacks for files (v7)

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Here is nothing interecting. If a file can't be dumped by criu,
plugins are called. If one of plugins knows how to dump the file,
the file entry is marked as need_callback. On restore if we see
this mark, we execute plugins for restoring the file.

v2: Callbacks are called for all files, which are not supported by CRIU.
v3: Call plugins for a file instead of file descriptor. A few file
descriptors can be associated with one file.
v4: A file descriptor is opened in a callback. It's required for
    restoring anon vmas.
v5: Add a separate type for unsupported files
v6: define FD_TYPES__UNSUPP
v7: s/unsupp/ext (external)

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2013-12-20 16:05:17 +04:00
committed by Pavel Emelyanov
parent 1e4b8c8c23
commit 6bbdec26f3
18 changed files with 146 additions and 9 deletions
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4
include/files.h
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@@ -147,4 +147,8 @@ extern int close_old_fds(struct pstree_item *me);
extern int shared_fdt_prepare(struct pstree_item *item);
extern struct collect_image_info ext_file_cinfo;
extern int dump_unsupp_fd(struct fd_parms *p, int lfd,
const int fdinfo, char *more, char *info);
#endif /* __CR_FILES_H__ */