mirror of
https://github.com/checkpoint-restore/criu
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d50c786c7e
A few processes can share one fdtable. Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
#ifndef __CR_FILES_H__
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#define __CR_FILES_H__
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#include "compiler.h"
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#include "asm/types.h"
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#include "lock.h"
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#include "list.h"
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#include "image.h"
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#include "../protobuf/fdinfo.pb-c.h"
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#include "../protobuf/fown.pb-c.h"
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#include "../protobuf/vma.pb-c.h"
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struct pstree_item;
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struct file_desc;
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struct cr_fdset;
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struct rst_info;
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struct parasite_ctl;
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struct fd_parms {
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int fd;
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unsigned long pos;
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unsigned int flags;
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char fd_flags;
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struct stat stat;
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pid_t pid;
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FownEntry fown;
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struct parasite_ctl *ctl;
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};
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#define FD_PARMS_INIT \
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{ \
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.fd = FD_DESC_INVALID, \
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.fown = FOWN_ENTRY__INIT, \
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}
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struct file_desc;
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struct fdinfo_list_entry {
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struct list_head desc_list; /* To chain on @fd_info_head */
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struct file_desc *desc; /* Associated file descriptor */
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struct list_head ps_list; /* To chain per-task files */
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int pid;
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futex_t real_pid;
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FdinfoEntry *fe;
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};
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/* reports whether fd_a takes prio over fd_b */
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static inline int fdinfo_rst_prio(struct fdinfo_list_entry *fd_a, struct fdinfo_list_entry *fd_b)
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{
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return (fd_a->pid < fd_b->pid) || ((fd_a->pid == fd_b->pid) && (fd_a->fe->fd < fd_b->fe->fd));
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}
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struct file_desc_ops {
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unsigned int type;
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int (*open)(struct file_desc *d);
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int (*post_open)(struct file_desc *d, int fd);
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int (*want_transport)(FdinfoEntry *fe, struct file_desc *d);
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struct list_head * (*select_ps_list)(struct file_desc *, struct rst_info *);
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};
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struct file_desc {
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u32 id; /* File descriptor id, unique */
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struct list_head hash; /* Descriptor hashing and lookup */
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struct list_head fd_info_head; /* Chain of fdinfo_list_entry-s with same ID and type but different pids */
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struct file_desc_ops *ops; /* Associated operations */
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};
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struct fdtype_ops {
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unsigned int type;
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int (*dump)(int lfd, u32 id, const struct fd_parms *p);
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};
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extern int do_dump_gen_file(struct fd_parms *p, int lfd,
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const struct fdtype_ops *ops,
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const int fdinfo);
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extern void file_desc_add(struct file_desc *d, u32 id, struct file_desc_ops *ops);
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extern struct fdinfo_list_entry *file_master(struct file_desc *d);
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extern struct file_desc *find_file_desc_raw(int type, u32 id);
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extern int send_fd_to_peer(int fd, struct fdinfo_list_entry *fle, int sock);
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extern int restore_fown(int fd, FownEntry *fown);
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extern int rst_file_params(int fd, FownEntry *fown, int flags);
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extern void show_saved_files(void);
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extern int prepare_fds(struct pstree_item *me);
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extern int prepare_fd_pid(struct pstree_item *me);
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extern int prepare_ctl_tty(int pid, struct rst_info *rst_info, u32 ctl_tty_id);
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extern int prepare_shared_fdinfo(void);
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extern int get_filemap_fd(int pid, VmaEntry *vma_entry);
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extern int prepare_fs(int pid);
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extern int set_fd_flags(int fd, int flags);
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extern int close_old_fds(struct pstree_item *me);
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#ifndef AT_EMPTY_PATH
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#define AT_EMPTY_PATH 0x1000
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#endif
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#define LREMAP_PARAM "link-remap"
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#endif /* __CR_FILES_H__ */
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