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files: make_gen_id -- Promote to be general helper

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It is used in files tree generation so we will need
reuse for epoll sake.

Also use the whole 64 bit offset to shuffle bits more.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Cyrill Gorcunov
2018-07-04 18:51:45 +03:00
committed by Andrei Vagin
parent 67bd254a0d
commit 605b9be815
2 changed files with 9 additions and 3 deletions
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11
criu/files.c
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@@ -303,9 +303,12 @@ static int fixup_overlayfs(struct fd_parms *p, struct fd_link *link)
* The kcmp-ids.c engine does this trick, see comments in it for more info.
*/
static u32 make_gen_id(const struct fd_parms *p)
uint32_t make_gen_id(uint32_t st_dev, uint32_t st_ino, uint64_t pos)
{
return ((u32)p->stat.st_dev) ^ ((u32)p->stat.st_ino) ^ ((u32)p->pos);
uint32_t pos_hi = pos >> 32;
uint32_t pos_low = pos & 0xffffffff;
return st_dev ^ st_ino ^ pos_hi ^ pos_low;
}
int do_dump_gen_file(struct fd_parms *p, int lfd,
@@ -314,7 +317,9 @@ int do_dump_gen_file(struct fd_parms *p, int lfd,
int ret = -1;
e->type = ops->type;
e->id = make_gen_id(p);
e->id = make_gen_id((uint32_t)p->stat.st_dev,
(uint32_t)p->stat.st_ino,
(uint64_t)p->pos);
e->fd = p->fd;
e->flags = p->fd_flags;

1
criu/include/files.h
View File

@@ -63,6 +63,7 @@ struct fd_parms {
}
extern int fill_fdlink(int lfd, const struct fd_parms *p, struct fd_link *link);
extern uint32_t make_gen_id(uint32_t st_dev, uint32_t st_ino, uint64_t pos);
struct file_desc;