From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sahitya Tummala Subject: [PATCH v2] f2fs: Fix deadlock in shutdown ioctl Date: Thu, 17 May 2018 13:33:31 +0530 Message-ID: <1526544211-26218-1-git-send-email-stummala@codeaurora.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Jaegeuk Kim , Chao Yu , linux-f2fs-devel@lists.sourceforge.net Cc: linux-kernel@vger.kernel.org, Sahitya Tummala List-Id: linux-f2fs-devel.lists.sourceforge.net f2fs_ioc_shutdown() ioctl gets stuck in the below path when issued with F2FS_GOING_DOWN_FULLSYNC option. __switch_to+0x90/0xc4 percpu_down_write+0x8c/0xc0 freeze_super+0xec/0x1e4 freeze_bdev+0xc4/0xcc f2fs_ioctl+0xc0c/0x1ce0 f2fs_compat_ioctl+0x98/0x1f0 Signed-off-by: Sahitya Tummala --- v2: remove lock coverage for only F2FS_GOING_DOWN_FULLSYNC case as suggested by Chao. fs/f2fs/file.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 6b94f19..5a132c9 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1857,6 +1857,7 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg) switch (in) { case F2FS_GOING_DOWN_FULLSYNC: + mnt_drop_write_file(filp); sb = freeze_bdev(sb->s_bdev); if (IS_ERR(sb)) { ret = PTR_ERR(sb); @@ -1894,7 +1895,8 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg) f2fs_update_time(sbi, REQ_TIME); out: - mnt_drop_write_file(filp); + if (in != F2FS_GOING_DOWN_FULLSYNC) + mnt_drop_write_file(filp); return ret; } -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.