On Mon, Jan 23, 2017 at 8:43 PM, Amir Goldstein <amir73il@xxxxxxxxx> wrote:
> Before calling write f_ops, call file_start_write() instead
> of sb_start_write().
>
> This ensures freeze protection for both overlay and upper fs
> when file is open from an overlayfs mount.
>
> Replace {sb,file}_start_write() for {copy,clone}_file_range() and
> for fallocate().
>
> For dedup_file_range() there is no need for mnt_want_write_file().
> File is already open for write, so we already have mnt_want_write()
> and we only need file_start_write().
Being opened for write is not verified if capable(CAP_SYS_ADMIN).
Ugly special case, don't ask me why it's done...
Thanks,
Miklos
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