On 2018/5/17 16:03, Sahitya Tummala wrote:
> 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 <stumm...@codeaurora.org>
> ---
> 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)

How about:

if (in != F2FS_GOING_DOWN_FULLSYNC)
        mnt_want_write_file();

switch()
{
        handle command;
}

if (in != F2FS_GOING_DOWN_FULLSYNC)
        mnt_drop_write_file();

Thanks,

>  
>       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;
>  }
>  
> 


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