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nsfs: Add a show_path method to fix mountinfo

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Today mountinfo displays a very unhelpful "/" for nsfs files.  Add a
show_path method returning the same string as ns_dname.  This results
in a bind mount of /proc/<pid>/ns/net showing up in /proc/<pid>/mountinfo as
"net:[1234...]" instead of "/".

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2015-05-24 12:49:04 -05:00
parent 77b1a97d21
commit 75509fd88f
1 changed files with 10 additions and 0 deletions
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10
fs/nsfs.c
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@ -4,6 +4,7 @@
#include <linux/proc_ns.h>
#include <linux/magic.h>
#include <linux/ktime.h>
#include <linux/seq_file.h>
static struct vfsmount *nsfs_mnt;
@ -136,9 +137,18 @@ struct file *proc_ns_fget(int fd)
return ERR_PTR(-EINVAL);
}
static int nsfs_show_path(struct seq_file *seq, struct dentry *dentry)
{
struct inode *inode = d_inode(dentry);
const struct proc_ns_operations *ns_ops = dentry->d_fsdata;
return seq_printf(seq, "%s:[%lu]", ns_ops->name, inode->i_ino);
}
static const struct super_operations nsfs_ops = {
.statfs = simple_statfs,
.evict_inode = nsfs_evict,
.show_path = nsfs_show_path,
};
static struct dentry *nsfs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)