linux-kernel - [PATCH] proc: stop using seq_get_buf in proc_task

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Message-Id: <20210810151945.1795567-1-hch@lst.de>
Date:   Tue, 10 Aug 2021 17:19:45 +0200
From:   Christoph Hellwig <hch@....de>
To:     akpm@...ux-foundation.org
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] proc: stop using seq_get_buf in proc_task_name

Use seq_escape_str and seq_printf instead of poking holes into the
seq_file abstraction.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/proc/array.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index ee0ce8cecc4a..49be8c8ef555 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -98,27 +98,17 @@
 
 void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
 {
-	char *buf;
-	size_t size;
 	char tcomm[64];
-	int ret;
 
 	if (p->flags & PF_WQ_WORKER)
 		wq_worker_comm(tcomm, sizeof(tcomm), p);
 	else
 		__get_task_comm(tcomm, sizeof(tcomm), p);
 
-	size = seq_get_buf(m, &buf);
-	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_commit(m, ret);
+	if (escape)
+		seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
+	else
+		seq_printf(m, "%.64s", tcomm);
 }
 
 /*
-- 
2.30.2