linux-kernel - [PATCH 1/1] f2fs: allocate trace path buffer from names

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Date:   Fri, 14 Apr 2023 18:43:08 +0800
From:   Wu Bo <bo.wu@...o.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, wubo.oduw@...il.com,
        Wu Bo <bo.wu@...o.com>
Subject: [PATCH 1/1] f2fs: allocate trace path buffer from names_cache

It would be better to use the dedicated slab to store path.

Signed-off-by: Wu Bo <bo.wu@...o.com>
---
 fs/f2fs/file.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 15dabeac4690..27137873958f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -4361,7 +4361,7 @@ static void f2fs_trace_rw_file_path(struct kiocb *iocb, size_t count, int rw)
 	struct inode *inode = file_inode(iocb->ki_filp);
 	char *buf, *path;
 
-	buf = f2fs_kmalloc(F2FS_I_SB(inode), PATH_MAX, GFP_KERNEL);
+	buf = __getname();
 	if (!buf)
 		return;
 	path = dentry_path_raw(file_dentry(iocb->ki_filp), buf, PATH_MAX);
@@ -4374,7 +4374,7 @@ static void f2fs_trace_rw_file_path(struct kiocb *iocb, size_t count, int rw)
 		trace_f2fs_dataread_start(inode, iocb->ki_pos, count,
 				current->pid, path, current->comm);
 free_buf:
-	kfree(buf);
+	__putname(buf);
 }
 
 static ssize_t f2fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
-- 
2.35.3