linux-imx

/*

 *

 * Copyright (C) 2011 Novell Inc.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 */

​

#include <linux/fs.h>

#include <linux/slab.h>

#include <linux/cred.h>

#include <linux/xattr.h>

#include <linux/posix_acl.h>

#include <linux/ratelimit.h>

#include "overlayfs.h"

​

​

int ovl_setattr(struct dentry *dentry, struct iattr *attr)

{

    int err;

    bool full_copy_up = false;

    struct dentry *upperdentry;

    const struct cred *old_cred;

​

    err = setattr_prepare(dentry, attr);

    if (err)

        return err;

​

    err = ovl_want_write(dentry);

    if (err)

        goto out;

​

    if (attr->ia_valid & ATTR_SIZE) {

        struct inode *realinode = d_inode(ovl_dentry_real(dentry));

​

        err = -ETXTBSY;

        if (atomic_read(&realinode->i_writecount) < 0)

            goto out_drop_write;

​

        /* Truncate should trigger data copy up as well */

        full_copy_up = true;

    }

​

    if (!full_copy_up)

        err = ovl_copy_up(dentry);

    else

        err = ovl_copy_up_with_data(dentry);

    if (!err) {

        struct inode *winode = NULL;

​

        upperdentry = ovl_dentry_upper(dentry);

​

        if (attr->ia_valid & ATTR_SIZE) {

            winode = d_inode(upperdentry);

            err = get_write_access(winode);

            if (err)

                goto out_drop_write;

        }

​

        if (attr->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))

            attr->ia_valid &= ~ATTR_MODE;

​