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mount: add helper mntns_get_root_by_mnt_id

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Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2014-08-03 22:31:20 +04:00
committed by Pavel Emelyanov
parent e4e22a00f7
commit 967dba606a
3 changed files with 12 additions and 7 deletions
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8
files-reg.c
View File

@@ -676,7 +676,6 @@ int open_path(struct file_desc *d,
int(*open_cb)(int mntns_root, struct reg_file_info *, void *), void *arg)
{
struct reg_file_info *rfi;
struct ns_id *ns;
int tmp, mntns_root;
char *orig_path = NULL;
@@ -722,12 +721,7 @@ int open_path(struct file_desc *d,
}
}
ns = lookup_nsid_by_mnt_id(rfi->rfe->mnt_id);
if (ns == NULL)
return -1;
mntns_root = mntns_get_root_fd(ns);
mntns_root = mntns_get_root_by_mnt_id(rfi->rfe->mnt_id);
tmp = open_cb(mntns_root, rfi, arg);
if (tmp < 0) {
pr_perror("Can't open file %s", rfi->path);

1
include/mount.h
View File

@@ -6,6 +6,7 @@ extern struct mount_info *mntinfo;
struct ns_id;
extern int __mntns_get_root_fd(pid_t pid);
extern int mntns_get_root_fd(struct ns_id *ns);
extern int mntns_get_root_by_mnt_id(int mnt_id);
extern struct ns_id *lookup_nsid_by_mnt_id(int mnt_id);
struct proc_mountinfo;

10
mount.c
View File

@@ -2062,6 +2062,16 @@ struct ns_id *lookup_nsid_by_mnt_id(int mnt_id)
return mi->nsid;
}
int mntns_get_root_by_mnt_id(int mnt_id)
{
struct ns_id *mntns;
mntns = lookup_nsid_by_mnt_id(mnt_id);
BUG_ON(mntns == NULL);
return mntns_get_root_fd(mntns);
}
static int walk_mnt_ns(int (*cb)(struct ns_id *, struct mount_info *, void *), void *arg)
{
struct mount_info *pms;