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proc_parse: parse fdinfo to get pos and flags

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We are going to parse fdinfo for getting mnt_id,
so we can take there pos and flags and don't call
fcntl and lseek for that.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin 2014-04-09 03:34:53 +04:00 committed by Pavel Emelyanov
parent d36e07aabe
commit 8bcffef6b9
3 changed files with 33 additions and 8 deletions
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14
files.c
View File

@ -34,6 +34,7 @@
#include "tun.h"
#include "fdset.h"
#include "fs-magic.h"
#include "proc_parse.h"
#include "parasite.h"
#include "parasite-syscall.h"
@ -204,6 +205,7 @@ static int fill_fd_params(struct parasite_ctl *ctl, int fd, int lfd,
{
int ret;
struct statfs fsbuf;
struct fdinfo_common fdinfo;
if (fstat(lfd, &p->stat) < 0) {
pr_perror("Can't stat fd %d", lfd);
@ -215,16 +217,14 @@ static int fill_fd_params(struct parasite_ctl *ctl, int fd, int lfd,
return -1;
}
if (parse_fdinfo(lfd, FD_TYPES__UND, NULL, &fdinfo))
return -1;
p->fs_type = fsbuf.f_type;
p->ctl = ctl;
p->fd = fd;
p->pos = lseek(lfd, 0, SEEK_CUR);
ret = fcntl(lfd, F_GETFL);
if (ret == -1) {
pr_perror("Unable to get fd %d flags", lfd);
return -1;
}
p->flags = ret;
p->pos = fdinfo.pos;
p->flags = fdinfo.flags;
p->pid = ctl->pid.real;
p->fd_flags = opts->flags;

5
include/proc_parse.h
View File

@ -153,6 +153,11 @@ union fdinfo_entries {
FanotifyMarkEntry ffy;
};
struct fdinfo_common {
off64_t pos;
int flags;
};
extern int parse_fdinfo(int fd, int type,
int (*cb)(union fdinfo_entries *e, void *arg), void *arg);
extern int parse_fdinfo_pid(int pid, int fd, int type,

22
proc_parse.c
View File

@ -1020,7 +1020,27 @@ static int parse_fdinfo_pid_s(char *pid, int fd, int type,
while (fgets(str, sizeof(str), f)) {
union fdinfo_entries entry;
if (fdinfo_field(str, "pos") || fdinfo_field(str, "counter"))
if (fdinfo_field(str, "pos") ||
fdinfo_field(str, "flags")) {
unsigned long long val;
struct fdinfo_common *fdinfo = arg;
if (type != FD_TYPES__UND)
continue;
ret = sscanf(str, "%*s %lli", &val);
if (ret != 1)
goto parse_err;
if (fdinfo_field(str, "pos"))
fdinfo->pos = val;
else if (fdinfo_field(str, "flags"))
fdinfo->flags = val;
entry_met = true;
continue;
}
if (type == FD_TYPES__UND)
continue;
if (fdinfo_field(str, "eventfd-count")) {