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[190.160.104.184]) by smtp.googlemail.com with ESMTPSA id s15sm3991925pgq.4.2019.12.18.09.38.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Dec 2019 09:38:41 -0800 (PST) From: Carlos Neira To: netdev@vger.kernel.org Cc: yhs@fb.com, ebiederm@xmission.com, brouer@redhat.com, bpf@vger.kernel.org, cneirabustos@gmail.com Subject: [PATCH v16 1/5] fs/nsfs.c: added ns_match Date: Wed, 18 Dec 2019 14:38:23 -0300 Message-Id: <20191218173827.20584-2-cneirabustos@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191218173827.20584-1-cneirabustos@gmail.com> References: <20191218173827.20584-1-cneirabustos@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org ns_match returns true if the namespace inode and dev_t matches the ones provided by the caller. Signed-off-by: Carlos Neira --- fs/nsfs.c | 14 ++++++++++++++ include/linux/proc_ns.h | 2 ++ 2 files changed, 16 insertions(+) diff --git a/fs/nsfs.c b/fs/nsfs.c index a0431642c6b5..ef59cf347285 100644 --- a/fs/nsfs.c +++ b/fs/nsfs.c @@ -245,6 +245,20 @@ struct file *proc_ns_fget(int fd) 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); 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