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a1a2c409b6
Allow /proc/<pid>/mountinfo to use the root of <pid> to calculate
mountpoints.
- move definition of 'struct proc_mounts' to <linux/mnt_namespace.h>
- add the process's namespace and root to this structure
- pass a pointer to 'struct proc_mounts' into seq_operations
In addition the following cleanups are made:
- use a common open function for /proc/<pid>/{mounts,mountstat}
- surround namespace.c part of these proc files with #ifdef CONFIG_PROC_FS
- make the seq_operations structures const
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
#ifndef _NAMESPACE_H_
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#define _NAMESPACE_H_
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#ifdef __KERNEL__
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#include <linux/mount.h>
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#include <linux/sched.h>
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#include <linux/nsproxy.h>
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#include <linux/seq_file.h>
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struct mnt_namespace {
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atomic_t count;
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struct vfsmount * root;
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struct list_head list;
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wait_queue_head_t poll;
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int event;
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};
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struct proc_mounts {
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struct seq_file m; /* must be the first element */
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struct mnt_namespace *ns;
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struct path root;
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int event;
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};
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extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *,
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struct fs_struct *);
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extern void __put_mnt_ns(struct mnt_namespace *ns);
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static inline void put_mnt_ns(struct mnt_namespace *ns)
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{
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if (atomic_dec_and_lock(&ns->count, &vfsmount_lock))
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/* releases vfsmount_lock */
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__put_mnt_ns(ns);
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}
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static inline void exit_mnt_ns(struct task_struct *p)
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{
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struct mnt_namespace *ns = p->nsproxy->mnt_ns;
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if (ns)
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put_mnt_ns(ns);
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}
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static inline void get_mnt_ns(struct mnt_namespace *ns)
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{
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atomic_inc(&ns->count);
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}
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extern const struct seq_operations mounts_op;
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extern const struct seq_operations mountstats_op;
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#endif
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#endif
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