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proc: Consolidate task->comm formatting into proc_task_name()

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proc shows task->comm in three places - comm, stat, status - and each
is fetching and formatting task->comm slighly differently.  This patch
renames task_name() to proc_task_name(), makes it more generic, and
updates all three paths to use it.

This will enable expanding comm reporting for workqueue workers.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2018-05-18 08:47:13 -07:00
parent 8bf895931e
commit 88b72b31e1
3 changed files with 19 additions and 14 deletions
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26
fs/proc/array.c
View File

@ -95,7 +95,7 @@
#include <asm/processor.h>
#include "internal.h"
static inline void task_name(struct seq_file *m, struct task_struct *p)
void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
{
char *buf;
size_t size;
@ -104,13 +104,17 @@ static inline void task_name(struct seq_file *m, struct task_struct *p)
get_task_comm(tcomm, p);
seq_puts(m, "Name:\t");
size = seq_get_buf(m, &buf);
ret = string_escape_str(tcomm, buf, size, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
seq_commit(m, ret < size ? ret : -1);
if (escape) {
ret = string_escape_str(tcomm, buf, size,
ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
if (ret >= size)
ret = -1;
} else {
ret = strscpy(buf, tcomm, size);
}
seq_putc(m, '\n');
seq_commit(m, ret);
}
/*
@ -365,7 +369,10 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
{
struct mm_struct *mm = get_task_mm(task);
task_name(m, task);
seq_puts(m, "Name:\t");
proc_task_name(m, task, true);
seq_putc(m, '\n');
task_state(m, ns, pid, task);
if (mm) {
@ -400,7 +407,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
u64 cutime, cstime, utime, stime;
u64 cgtime, gtime;
unsigned long rsslim = 0;
char tcomm[sizeof(task->comm)];
unsigned long flags;
state = *get_task_state(task);
@ -427,8 +433,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
}
}
get_task_comm(tcomm, task);
sigemptyset(&sigign);
sigemptyset(&sigcatch);
cutime = cstime = utime = stime = 0;
@ -495,7 +499,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
seq_puts(m, " (");
seq_puts(m, tcomm);
proc_task_name(m, task, false);
seq_puts(m, ") ");
seq_putc(m, state);
seq_put_decimal_ll(m, " ", ppid);

5
fs/proc/base.c
View File

@ -1565,9 +1565,8 @@ static int comm_show(struct seq_file *m, void *v)
if (!p)
return -ESRCH;
task_lock(p);
seq_printf(m, "%s\n", p->comm);
task_unlock(p);
proc_task_name(m, p, false);
seq_putc(m, '\n');
put_task_struct(p);

2
fs/proc/internal.h
View File

@ -131,6 +131,8 @@ unsigned name_to_int(const struct qstr *qstr);
*/
extern const struct file_operations proc_tid_children_operations;
extern void proc_task_name(struct seq_file *m, struct task_struct *p,
bool escape);
extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,
struct pid *, struct task_struct *);
extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,