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From: Carlos Neira <cneirabustos@gmail.com>
To: netdev@vger.kernel.org
Cc: yhs@fb.com, ebiederm@xmission.com, brouer@redhat.com,
	bpf@vger.kernel.org, cneirabustos@gmail.com
Subject: [PATCH v14 1/5] fs/nsfs.c: added ns_match
Date: Thu, 17 Oct 2019 12:00:28 -0300	[thread overview]
Message-ID: <20191017150032.14359-2-cneirabustos@gmail.com> (raw)
In-Reply-To: <20191017150032.14359-1-cneirabustos@gmail.com>

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

Signed-off-by: Carlos Neira <cneirabustos@gmail.com>
---
 fs/nsfs.c               | 8 ++++++++
 include/linux/proc_ns.h | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/fs/nsfs.c b/fs/nsfs.c
index a0431642c6b5..256f6295d33d 100644
--- a/fs/nsfs.c
+++ b/fs/nsfs.c
@@ -245,6 +245,14 @@ struct file *proc_ns_fget(int fd)
 	return ERR_PTR(-EINVAL);
 }
 
+/* Returns true if current namespace matches dev/ino.
+ */
+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);
diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h
index d31cb6215905..1da9f33489f3 100644
--- a/include/linux/proc_ns.h
+++ b/include/linux/proc_ns.h
@@ -82,6 +82,8 @@ typedef struct ns_common *ns_get_path_helper_t(void *);
 extern void *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);
-- 
2.20.1


  reply	other threads:[~2019-10-17 15:00 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-17 15:00 [PATCH v14 0/5] BPF: New helper to obtain namespace data from current task Carlos Neira
2019-10-17 15:00 ` Carlos Neira [this message]
2019-10-18  9:24   ` [PATCH v14 1/5] fs/nsfs.c: added ns_match Simon Horman
2019-10-17 15:00 ` [PATCH v14 2/5] bpf: added new helper bpf_get_ns_current_pid_tgid Carlos Neira
2019-10-18 17:10   ` Yonghong Song
2019-10-17 15:00 ` [PATCH v14 3/5] tools: Added bpf_get_ns_current_pid_tgid helper Carlos Neira
2019-10-18 17:11   ` Yonghong Song
2019-10-17 15:00 ` [PATCH v14 4/5] tools/testing/selftests/bpf: Add self-tests for new helper Carlos Neira
2019-10-18 17:33   ` Yonghong Song
2019-10-21 18:20     ` Andrii Nakryiko
2019-10-21 19:14       ` Carlos Antonio Neira Bustos
2019-10-21 19:18         ` Andrii Nakryiko
2019-10-22 16:50           ` Carlos Antonio Neira Bustos
2019-10-17 15:00 ` [PATCH v14 5/5] bpf_helpers_doc.py: Add struct bpf_pidns_info to known types Carlos Neira
2019-10-18 17:34   ` Yonghong Song

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