From 75509fd88fbd580c793780b0001c71c3510f2726 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Sun, 24 May 2015 12:49:04 -0500 Subject: [PATCH] nsfs: Add a show_path method to fix mountinfo 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//ns/net showing up in /proc//mountinfo as "net:[1234...]" instead of "/". Signed-off-by: "Eric W. Biederman" --- fs/nsfs.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/nsfs.c b/fs/nsfs.c index 99521e7c492b..e4905fbf3396 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -4,6 +4,7 @@ #include #include #include +#include static struct vfsmount *nsfs_mnt; @@ -136,9 +137,18 @@ out_invalid: 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) -- 2.39.5