Commit 1e2328e7 authored by Carlos Neira's avatar Carlos Neira Committed by Alexei Starovoitov
Browse files

fs/nsfs.c: Added ns_match 



ns_match returns true if the namespace inode and dev_t matches the ones
provided by the caller.

Signed-off-by: default avatarCarlos Neira <cneirabustos@gmail.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200304204157.58695-2-cneirabustos@gmail.com
parent 132c1af0

fs/nsfs.c

+14 −0
Original line number Diff line number Diff line
@@ -247,6 +247,20 @@ out_invalid: 
	return ERR_PTR(-EINVAL);

}



/**

 * ns_match() - Returns true if current namespace matches dev/ino provided.

 * @ns_common: current ns

 * @dev: dev_t from nsfs that will be matched against current nsfs

 * @ino: ino_t from nsfs that will be matched against current nsfs

 *

 * Return: true if dev and ino matches the current nsfs.

 */

bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino)

{

	return (ns->inum == ino) && (nsfs_mnt->mnt_sb->s_dev == dev);

}





static int nsfs_show_path(struct seq_file *seq, struct dentry *dentry)

{

	struct inode *inode = d_inode(dentry);

include/linux/proc_ns.h

+2 −0
Original line number Diff line number Diff line
@@ -85,6 +85,8 @@ typedef struct ns_common *ns_get_path_helper_t(void *); 
extern int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,

			    void *private_data);



extern bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);



extern int ns_get_name(char *buf, size_t size, struct task_struct *task,

			const struct proc_ns_operations *ns_ops);

extern void nsfs_init(void);

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