diff options
| author | Sahitya Tummala <stummala@codeaurora.org> | 2018-05-18 11:51:52 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-03 07:55:15 +0200 |
| commit | bce7f720f4ca9d48ea4be05b49010c35e1c7f956 (patch) | |
| tree | f8cbb0719bf09c21a0861644945e43ba4da87582 /fs | |
| parent | 570f12a8b651e45a0af48cced6c54c571e5bb328 (diff) | |
f2fs: Fix deadlock in shutdown ioctl
[ Upstream commit 60b2b4ee2bc01dd052f99fa9d65da2232102ef8e ]
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 <stummala@codeaurora.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/f2fs/file.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 801111e1f8ef..249f917a494b 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1670,9 +1670,11 @@ 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; + if (in != F2FS_GOING_DOWN_FULLSYNC) { + ret = mnt_want_write_file(filp); + if (ret) + return ret; + } switch (in) { case F2FS_GOING_DOWN_FULLSYNC: @@ -1700,7 +1702,8 @@ 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; } |