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parasite: Dump misc command

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Add command and basis for dumping minor bits for task
from parasite code. It's supposed to retrieve minor bits
form tasks which cannot be read from /proc.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
This commit is contained in:
Pavel Emelyanov 2012-01-27 21:35:59 +04:00 • committed by Cyrill Gorcunov
parent 25aa9e062c
commit 47c161f2dc
5 changed files with 37 additions and 0 deletions
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8
cr-dump.c
View file

@ -6,6 +6,7 @@
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <parasite.h>
#include <fcntl.h>
@ -1142,6 +1143,7 @@ static int dump_one_task(struct pstree_item *item, struct cr_fdset *cr_fdset)
struct parasite_ctl *parasite_ctl;
int ret = -1;
int pid_dir;
struct parasite_dump_misc misc;
pr_info("========================================\n");
pr_info("Dumping task (pid: %d)\n", pid);
@ -1217,6 +1219,12 @@ static int dump_one_task(struct pstree_item *item, struct cr_fdset *cr_fdset)
goto err;
}
ret = parasite_dump_misc_seized(parasite_ctl, &misc);
if (ret) {
pr_err("Can't dump misc (pid: %d)\n", pid);
goto err;
}
ret = parasite_cure_seized(parasite_ctl, &vma_area_list);
if (ret) {
pr_err("Can't cure (pid: %d) from parasite\n", pid);

3
include/parasite-syscall.h
View file

@ -41,6 +41,9 @@ extern int parasite_dump_pages_seized(struct parasite_ctl *ctl, struct list_head
extern int parasite_dump_sigacts_seized(struct parasite_ctl *ctl, struct cr_fdset *cr_fdset);
extern int parasite_dump_itimers_seized(struct parasite_ctl *ctl, struct cr_fdset *cr_fdset);
struct parasite_dump_misc;
extern int parasite_dump_misc_seized(struct parasite_ctl *ctl, struct parasite_dump_misc *);
extern struct parasite_ctl *parasite_infect_seized(pid_t pid, struct list_head *vma_area_list);
extern int parasite_cure_seized(struct parasite_ctl *ctl, struct list_head *vma_area_list);

10
include/parasite.h
View file

@ -35,6 +35,7 @@ enum {
PARASITE_CMD_DUMPPAGES,
PARASITE_CMD_DUMP_SIGACTS,
PARASITE_CMD_DUMP_ITIMERS,
PARASITE_CMD_DUMP_MISC,
PARASITE_CMD_MAX,
};
@ -73,6 +74,15 @@ struct parasite_dump_pages_args {
unsigned long fd;
};
/*
* Misc sfuff, that is too small for separate file, but cannot
* be read w/o using parasite
*/
struct parasite_dump_misc {
parasite_status_t status;
};
/*
* Some useful offsets
*/

6
parasite-syscall.c
View file

@ -393,6 +393,12 @@ int parasite_dump_itimers_seized(struct parasite_ctl *ctl, struct cr_fdset *cr_f
return parasite_file_cmd(PARASITE_CMD_DUMP_ITIMERS, CR_FD_ITIMERS, ctl, cr_fdset);
}
int parasite_dump_misc_seized(struct parasite_ctl *ctl, struct parasite_dump_misc *misc)
{
return parasite_execute(PARASITE_CMD_DUMP_MISC, ctl,
(parasite_status_t *)misc, sizeof(struct parasite_dump_misc));
}
/*
* This routine drives parasite code (been previously injected into a victim
* process) and tells it to dump pages into the file.

10
parasite.c
View file

@ -348,6 +348,14 @@ err_close:
return ret;
}
static int dump_misc(struct parasite_dump_misc *args)
{
parasite_status_t *st = &args->status;
SET_PARASITE_STATUS(st, 0, 0);
return 0;
}
static int __used parasite_service(unsigned long cmd, void *args, void *brk)
{
brk_init(brk);
@ -367,6 +375,8 @@ static int __used parasite_service(unsigned long cmd, void *args, void *brk)
return dump_sigact((struct parasite_dump_file_args *)args);
case PARASITE_CMD_DUMP_ITIMERS:
return dump_itimers((struct parasite_dump_file_args *)args);
case PARASITE_CMD_DUMP_MISC:
return dump_misc((struct parasite_dump_misc *)args);
default:
sys_write_msg("Unknown command to parasite\n");
break;