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    Subject[PATCH v2 14/35] ovl: add ovl_write_iter()
    Date
    Implement stacked writes.

    Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
    ---
    fs/overlayfs/file.c | 39 +++++++++++++++++++++++++++++++++++++++
    1 file changed, 39 insertions(+)

    diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
    index bbc40a14acf8..a7af56861aa5 100644
    --- a/fs/overlayfs/file.c
    +++ b/fs/overlayfs/file.c
    @@ -195,9 +195,48 @@ static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter)
    return ret;
    }

    +static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
    +{
    + struct file *file = iocb->ki_filp;
    + struct inode *inode = file_inode(file);
    + struct fd real;
    + const struct cred *old_cred;
    + ssize_t ret;
    +
    + if (!iov_iter_count(iter))
    + return 0;
    +
    + inode_lock(inode);
    + /* Update mode */
    + ovl_copyattr(ovl_inode_real(inode), inode);
    + ret = file_remove_privs(file);
    + if (ret)
    + goto out_unlock;
    +
    + ret = ovl_real_fdget(file, &real);
    + if (ret)
    + goto out_unlock;
    +
    + old_cred = ovl_override_creds(file_inode(file)->i_sb);
    + ret = vfs_iter_write(real.file, iter, &iocb->ki_pos,
    + ovl_iocb_to_rwf(iocb));
    + revert_creds(old_cred);
    +
    + /* Update size */
    + ovl_copyattr(ovl_inode_real(inode), inode);
    +
    + fdput(real);
    +
    +out_unlock:
    + inode_unlock(inode);
    +
    + 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,
    };
    --
    2.14.3
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