From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sahitya Tummala Subject: [PATCH] f2fs: Fix deadlock in shutdown ioctl Date: Thu, 10 May 2018 18:50:44 +0530 Message-ID: <1525958444-5579-1-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 going down with full sync (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 Fix this by not holding write access during this ioctl. Signed-off-by: Sahitya Tummala --- fs/f2fs/file.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index b926df7..2c2e61b 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1835,10 +1835,6 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg) if (get_user(in, (__u32 __user *)arg)) return -EFAULT; - ret = mnt_want_write_file(filp); - if (ret) - return ret; - switch (in) { case F2FS_GOING_DOWN_FULLSYNC: sb = freeze_bdev(sb->s_bdev); @@ -1878,7 +1874,6 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg) f2fs_update_time(sbi, REQ_TIME); out: - 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.