mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Ram Pai](/assets/img/avatar_default.png)
[mszeredi@suse.cz] rewrite and split big patch into managable chunks /proc/mounts in its current form lacks important information: - propagation state - root of mount for bind mounts - the st_dev value used within the filesystem - identifier for each mount and it's parent It also suffers from the following problems: - not easily extendable - ambiguity of mountpoints within a chrooted environment - doesn't distinguish between filesystem dependent and independent options - doesn't distinguish between per mount and per super block options This patch introduces /proc/<pid>/mountinfo which attempts to address all these deficiencies. Code shared between /proc/<pid>/mounts and /proc/<pid>/mountinfo is extracted into separate functions. Thanks to Al Viro for the help in getting the design right. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
#ifndef _NAMESPACE_H_
|
|
#define _NAMESPACE_H_
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/mount.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/nsproxy.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
struct mnt_namespace {
|
|
atomic_t count;
|
|
struct vfsmount * root;
|
|
struct list_head list;
|
|
wait_queue_head_t poll;
|
|
int event;
|
|
};
|
|
|
|
struct proc_mounts {
|
|
struct seq_file m; /* must be the first element */
|
|
struct mnt_namespace *ns;
|
|
struct path root;
|
|
int event;
|
|
};
|
|
|
|
extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *,
|
|
struct fs_struct *);
|
|
extern void __put_mnt_ns(struct mnt_namespace *ns);
|
|
|
|
static inline void put_mnt_ns(struct mnt_namespace *ns)
|
|
{
|
|
if (atomic_dec_and_lock(&ns->count, &vfsmount_lock))
|
|
/* releases vfsmount_lock */
|
|
__put_mnt_ns(ns);
|
|
}
|
|
|
|
static inline void exit_mnt_ns(struct task_struct *p)
|
|
{
|
|
struct mnt_namespace *ns = p->nsproxy->mnt_ns;
|
|
if (ns)
|
|
put_mnt_ns(ns);
|
|
}
|
|
|
|
static inline void get_mnt_ns(struct mnt_namespace *ns)
|
|
{
|
|
atomic_inc(&ns->count);
|
|
}
|
|
|
|
extern const struct seq_operations mounts_op;
|
|
extern const struct seq_operations mountinfo_op;
|
|
extern const struct seq_operations mountstats_op;
|
|
|
|
#endif
|
|
#endif
|