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authorAlexey Dobriyan <adobriyan@gmail.com>2014-08-08 14:21:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-08 15:57:23 -0700
commit2ca66ff70a49f0c92352282d6a67d47be090a462 (patch)
tree0492545ee2cde3b9c58cac0a567c77de042aaf33
parent09d93bd6270981446cfaa5938c8d5f6cfc2d84a1 (diff)
proc: convert /proc/$PID/cmdline to seq_file interface
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/proc/base.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index f5d0f8f39a57..a6d0214c7c95 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),