Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Daeho Jeong <daehojeong@google.com>,
        Chao Yu <chao@kernel.org>, Jaegeuk Kim <jaegeuk@kernel.org>
Subject: [PATCH 5.18 1091/1095] f2fs: revive F2FS_IOC_ABORT_VOLATILE_WRITE
Date:   Mon, 15 Aug 2022 20:08:10 +0200
Message-Id: <20220815180514.151114549@linuxfoundation.org>
In-Reply-To: <20220815180429.240518113@linuxfoundation.org>
References: <20220815180429.240518113@linuxfoundation.org>
User-Agent: quilt/0.67
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Daeho Jeong <daehojeong@google.com>

commit 23339e5752d01a4b5e122759b002cf896d26f6c1 upstream.

F2FS_IOC_ABORT_VOLATILE_WRITE was used to abort a atomic write before.
However it was removed accidentally. So revive it by changing the name,
since volatile write had gone.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Fiexes: 7bc155fec5b3("f2fs: kill volatile write support")
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/f2fs/file.c            |   30 ++++++++++++++++++++++++++++--
 include/uapi/linux/f2fs.h |    2 +-
 2 files changed, 29 insertions(+), 3 deletions(-)

--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2102,6 +2102,31 @@ unlock_out:
 	return ret;
 }
 
+static int f2fs_ioc_abort_atomic_write(struct file *filp)
+{
+	struct inode *inode = file_inode(filp);
+	struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
+	int ret;
+
+	if (!inode_owner_or_capable(mnt_userns, inode))
+		return -EACCES;
+
+	ret = mnt_want_write_file(filp);
+	if (ret)
+		return ret;
+
+	inode_lock(inode);
+
+	if (f2fs_is_atomic_file(inode))
+		f2fs_abort_atomic_write(inode, true);
+
+	inode_unlock(inode);
+
+	mnt_drop_write_file(filp);
+	f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
+	return ret;
+}
+
 static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg)
 {
 	struct inode *inode = file_inode(filp);
@@ -4039,9 +4064,10 @@ static long __f2fs_ioctl(struct file *fi
 		return f2fs_ioc_start_atomic_write(filp);
 	case F2FS_IOC_COMMIT_ATOMIC_WRITE:
 		return f2fs_ioc_commit_atomic_write(filp);
+	case F2FS_IOC_ABORT_ATOMIC_WRITE:
+		return f2fs_ioc_abort_atomic_write(filp);
 	case F2FS_IOC_START_VOLATILE_WRITE:
 	case F2FS_IOC_RELEASE_VOLATILE_WRITE:
-	case F2FS_IOC_ABORT_VOLATILE_WRITE:
 		return -EOPNOTSUPP;
 	case F2FS_IOC_SHUTDOWN:
 		return f2fs_ioc_shutdown(filp, arg);
@@ -4666,7 +4692,7 @@ long f2fs_compat_ioctl(struct file *file
 	case F2FS_IOC_COMMIT_ATOMIC_WRITE:
 	case F2FS_IOC_START_VOLATILE_WRITE:
 	case F2FS_IOC_RELEASE_VOLATILE_WRITE:
-	case F2FS_IOC_ABORT_VOLATILE_WRITE:
+	case F2FS_IOC_ABORT_ATOMIC_WRITE:
 	case F2FS_IOC_SHUTDOWN:
 	case FITRIM:
 	case FS_IOC_SET_ENCRYPTION_POLICY:
--- a/include/uapi/linux/f2fs.h
+++ b/include/uapi/linux/f2fs.h
@@ -13,7 +13,7 @@
 #define F2FS_IOC_COMMIT_ATOMIC_WRITE	_IO(F2FS_IOCTL_MAGIC, 2)
 #define F2FS_IOC_START_VOLATILE_WRITE	_IO(F2FS_IOCTL_MAGIC, 3)
 #define F2FS_IOC_RELEASE_VOLATILE_WRITE	_IO(F2FS_IOCTL_MAGIC, 4)
-#define F2FS_IOC_ABORT_VOLATILE_WRITE	_IO(F2FS_IOCTL_MAGIC, 5)
+#define F2FS_IOC_ABORT_ATOMIC_WRITE	_IO(F2FS_IOCTL_MAGIC, 5)
 #define F2FS_IOC_GARBAGE_COLLECT	_IOW(F2FS_IOCTL_MAGIC, 6, __u32)
 #define F2FS_IOC_WRITE_CHECKPOINT	_IO(F2FS_IOCTL_MAGIC, 7)
 #define F2FS_IOC_DEFRAGMENT		_IOWR(F2FS_IOCTL_MAGIC, 8,	\