From 2ca66ff70a49f0c92352282d6a67d47be090a462 Mon Sep 17 00:00:00 2001 From: Alexey Dobriyan Date: Fri, 8 Aug 2014 14:21:41 -0700 Subject: [PATCH] proc: convert /proc/$PID/cmdline to seq_file interface Signed-off-by: Alexey Dobriyan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/base.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/fs/proc/base.c b/fs/proc/base.c index f5d0f8f..a6d0214 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -200,9 +200,16 @@ static int proc_root_link(struct dentry *dentry, struct path *path) return result; } -static int proc_pid_cmdline(struct task_struct *task, char *buffer) +static int proc_pid_cmdline(struct seq_file *m, struct pid_namespace *ns, + struct pid *pid, struct task_struct *task) { - return get_cmdline(task, buffer, PAGE_SIZE); + /* + * Rely on struct seq_operations::show() being called once + * per internal buffer allocation. See single_open(), traverse(). + */ + BUG_ON(m->size < PAGE_SIZE); + m->count += get_cmdline(task, m->buf, PAGE_SIZE); + return 0; } static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns, @@ -2567,7 +2574,7 @@ static const struct pid_entry tgid_base_stuff[] = { #ifdef CONFIG_HAVE_ARCH_TRACEHOOK ONE("syscall", S_IRUSR, proc_pid_syscall), #endif - INF("cmdline", S_IRUGO, proc_pid_cmdline), + ONE("cmdline", S_IRUGO, proc_pid_cmdline), ONE("stat", S_IRUGO, proc_tgid_stat), ONE("statm", S_IRUGO, proc_pid_statm), REG("maps", S_IRUGO, proc_pid_maps_operations), @@ -2903,7 +2910,7 @@ static const struct pid_entry tid_base_stuff[] = { #ifdef CONFIG_HAVE_ARCH_TRACEHOOK ONE("syscall", S_IRUSR, proc_pid_syscall), #endif - INF("cmdline", S_IRUGO, proc_pid_cmdline), + ONE("cmdline", S_IRUGO, proc_pid_cmdline), ONE("stat", S_IRUGO, proc_tid_stat), ONE("statm", S_IRUGO, proc_pid_statm), REG("maps", S_IRUGO, proc_tid_maps_operations), -- 2.7.4