From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753379AbaKGUOm (ORCPT ); Fri, 7 Nov 2014 15:14:42 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45856 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752462AbaKGUOj (ORCPT ); Fri, 7 Nov 2014 15:14:39 -0500 Date: Fri, 7 Nov 2014 21:14:48 +0100 From: Oleg Nesterov To: Andrew Morton Cc: Aaron Tomlin , Alexey Dobriyan , "Eric W. Biederman" , Sterling Alexander , linux-kernel@vger.kernel.org Subject: [PATCH 2/4] proc: task_state: deuglify the max_fds calculation Message-ID: <20141107201448.GA22236@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20141107201424.GA22209@redhat.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 1. The usage of fdt looks very ugly, it can't be NULL if ->files is not NULL. We can use "unsigned int max_fds" instead. 2. This also allows to move seq_printf(max_fds) outside of task_lock() and join it with the previous seq_printf(). See also the next patch. Signed-off-by: Oleg Nesterov --- fs/proc/array.c | 23 +++++++++++------------ 1 files changed, 11 insertions(+), 12 deletions(-) diff --git a/fs/proc/array.c b/fs/proc/array.c index b5810c2..7c8d9ae 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -157,9 +157,9 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, struct user_namespace *user_ns = seq_user_ns(m); struct group_info *group_info; int g; - struct fdtable *fdt = NULL; const struct cred *cred; pid_t ppid, tpid; + unsigned int max_fds = 0; rcu_read_lock(); ppid = pid_alive(p) ? @@ -171,6 +171,12 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, tpid = task_pid_nr_ns(tracer, ns); } cred = get_task_cred(p); + + task_lock(p); + if (p->files) + max_fds = files_fdtable(p->files)->max_fds; + task_unlock(p); + seq_printf(m, "State:\t%s\n" "Tgid:\t%d\n" @@ -179,7 +185,8 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, "PPid:\t%d\n" "TracerPid:\t%d\n" "Uid:\t%d\t%d\t%d\t%d\n" - "Gid:\t%d\t%d\t%d\t%d\n", + "Gid:\t%d\t%d\t%d\t%d\n" + "FDSize:\t%d\nGroups:\t", get_task_state(p), task_tgid_nr_ns(p, ns), task_numa_group_id(p), @@ -192,16 +199,8 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, from_kgid_munged(user_ns, cred->gid), from_kgid_munged(user_ns, cred->egid), from_kgid_munged(user_ns, cred->sgid), - from_kgid_munged(user_ns, cred->fsgid)); - - task_lock(p); - if (p->files) - fdt = files_fdtable(p->files); - seq_printf(m, - "FDSize:\t%d\n" - "Groups:\t", - fdt ? fdt->max_fds : 0); - task_unlock(p); + from_kgid_munged(user_ns, cred->fsgid), + max_fds); rcu_read_unlock(); group_info = cred->group_info; -- 1.5.5.1