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    Subject[PATCH v2 15/35] ovl: add ovl_fsync()
    Date
    Implement stacked fsync().

    Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
    ---
    fs/overlayfs/file.c | 20 ++++++++++++++++++++
    1 file changed, 20 insertions(+)

    diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
    index a7af56861aa5..419aa3f9967b 100644
    --- a/fs/overlayfs/file.c
    +++ b/fs/overlayfs/file.c
    @@ -233,10 +233,30 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
    return ret;
    }

    +static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync)
    +{
    + struct fd real;
    + const struct cred *old_cred;
    + int ret;
    +
    + ret = ovl_real_fdget(file, &real);
    + if (ret)
    + return ret;
    +
    + old_cred = ovl_override_creds(file_inode(file)->i_sb);
    + ret = vfs_fsync_range(real.file, start, end, datasync);
    + revert_creds(old_cred);
    +
    + fdput(real);
    +
    + return ret;
    +}
    +
    const struct file_operations ovl_file_operations = {
    .open = ovl_open,
    .release = ovl_release,
    .llseek = ovl_llseek,
    .read_iter = ovl_read_iter,
    .write_iter = ovl_write_iter,
    + .fsync = ovl_fsync,
    };
    --
    2.14.3
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