Hi Chao,
On Thu, Dec 24, 2015 at 06:10:25PM +0800, Chao Yu wrote:
> Sometimes user want to sync all data belong to superblock into storage
> for persistence, 'syncfs' syscall is one option, still f2fs supports
> similar one through ioctl, difference is that sb releted kworker is
> online for writebacking concurrently.
There is compatibility issue, since you're trying to change pre-defined
ioctl; it needs to change F2FS_IOC_WRITE_CHECKPOINT too, right?
I'm in doubt that we really need to expose this too.
Thanks,
>
> Signed-off-by: Chao Yu <chao2...@samsung.com>
> ---
> fs/f2fs/file.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index a60d088..91997a5 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1621,6 +1621,7 @@ static int f2fs_ioc_write_checkpoint(struct file *filp,
> unsigned long arg)
> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> struct cp_control cpc;
> int err;
> + int flush_data;
>
> if (!capable(CAP_SYS_ADMIN))
> return -EPERM;
> @@ -1628,6 +1629,15 @@ static int f2fs_ioc_write_checkpoint(struct file
> *filp, unsigned long arg)
> if (f2fs_readonly(sbi->sb))
> return -EROFS;
>
> + if (get_user(flush_data, (__u32 __user *)arg))
> + return -EFAULT;
> +
> + if (flush_data) {
> + err = sync_dirty_inodes(sbi, FILE_INODE);
> + if (err)
> + return err;
> + }
> +
> cpc.reason = __get_cp_reason(sbi);
>
> mutex_lock(&sbi->gc_mutex);
> --
> 2.6.3
>
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