From: Xiyu Yang <xiyuyang19@fudan.edu.cn>
To: "Theodore Ts'o" <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: yuanxzhang@fudan.edu.cn, Xiyu Yang <xiyuyang19@fudan.edu.cn>,
Xin Tan <tanxin.ctf@gmail.com>
Subject: [PATCH] ext4: Convert from atomic_t to refcount_t on ext4_io_end->count
Date: Mon, 19 Jul 2021 13:59:14 +0800 [thread overview]
Message-ID: <1626674355-55795-1-git-send-email-xiyuyang19@fudan.edu.cn> (raw)
refcount_t type and corresponding API can protect refcounters from
accidental underflow and overflow and further use-after-free situations.
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
---
fs/ext4/ext4.h | 3 ++-
fs/ext4/page-io.c | 8 ++++----
2 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 3c51e243450d..e5b3575da7e9 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -17,6 +17,7 @@
#ifndef _EXT4_H
#define _EXT4_H
+#include <linux/refcount.h>
#include <linux/types.h>
#include <linux/blkdev.h>
#include <linux/magic.h>
@@ -241,7 +242,7 @@ typedef struct ext4_io_end {
struct bio *bio; /* Linked list of completed
* bios covering the extent */
unsigned int flag; /* unwritten or not */
- atomic_t count; /* reference counter */
+ refcount_t count; /* reference counter */
struct list_head list_vec; /* list of ext4_io_end_vec */
} ext4_io_end_t;
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index f038d578d8d8..9cb261714991 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -279,14 +279,14 @@ ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags)
io_end->inode = inode;
INIT_LIST_HEAD(&io_end->list);
INIT_LIST_HEAD(&io_end->list_vec);
- atomic_set(&io_end->count, 1);
+ refcount_set(&io_end->count, 1);
}
return io_end;
}
void ext4_put_io_end_defer(ext4_io_end_t *io_end)
{
- if (atomic_dec_and_test(&io_end->count)) {
+ if (refcount_dec_and_test(&io_end->count)) {
if (!(io_end->flag & EXT4_IO_END_UNWRITTEN) ||
list_empty(&io_end->list_vec)) {
ext4_release_io_end(io_end);
@@ -300,7 +300,7 @@ int ext4_put_io_end(ext4_io_end_t *io_end)
{
int err = 0;
- if (atomic_dec_and_test(&io_end->count)) {
+ if (refcount_dec_and_test(&io_end->count)) {
if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
err = ext4_convert_unwritten_io_end_vec(io_end->handle,
io_end);
@@ -314,7 +314,7 @@ int ext4_put_io_end(ext4_io_end_t *io_end)
ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end)
{
- atomic_inc(&io_end->count);
+ refcount_inc(&io_end->count);
return io_end;
}
--
2.7.4
next reply other threads:[~2021-07-19 5:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-19 5:59 Xiyu Yang [this message]
2021-08-04 14:06 ` [PATCH] ext4: Convert from atomic_t to refcount_t on ext4_io_end->count Jan Kara
2021-10-13 20:46 ` Theodore Ts'o
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