// SPDX-License-Identifier: GPL-2.0-only

  /*
   * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.

   * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.

   */
  
  #include <linux/sched.h>
  #include <linux/slab.h>
  #include <linux/spinlock.h>
  #include <linux/completion.h>
  #include <linux/buffer_head.h>

  #include <linux/xattr.h>

  #include <linux/posix_acl.h>
  #include <linux/posix_acl_xattr.h>

  #include <linux/gfs2_ondisk.h>

  
  #include "gfs2.h"

  #include "incore.h"

  #include "acl.h"

  #include "xattr.h"

  #include "glock.h"
  #include "inode.h"
  #include "meta_io.h"

  #include "quota.h"

  #include "rgrp.h"

  #include "trans.h"

  #include "util.h"

  static const char *gfs2_acl_name(int type)

  {

  	switch (type) {
  	case ACL_TYPE_ACCESS:

  		return XATTR_POSIX_ACL_ACCESS;

  	case ACL_TYPE_DEFAULT:

  		return XATTR_POSIX_ACL_DEFAULT;

  	}
  	return NULL;
  }

  static struct posix_acl *__gfs2_get_acl(struct inode *inode, int type)

  {

  	struct gfs2_inode *ip = GFS2_I(inode);

  	struct posix_acl *acl;
  	const char *name;
  	char *data;
  	int len;

  	if (!ip->i_eattr)

  		return NULL;

  	name = gfs2_acl_name(type);

  	len = gfs2_xattr_acl_get(ip, name, &data);

  	if (len <= 0)

  		return ERR_PTR(len);

  	acl = posix_acl_from_xattr(&init_user_ns, data, len);

  	kfree(data);
  	return acl;

  }

  struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
  {
  	struct gfs2_inode *ip = GFS2_I(inode);
  	struct gfs2_holder gh;
  	bool need_unlock = false;
  	struct posix_acl *acl;
  
  	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
  		int ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
  					     LM_FLAG_ANY, &gh);
  		if (ret)
  			return ERR_PTR(ret);
  		need_unlock = true;
  	}
  	acl = __gfs2_get_acl(inode, type);
  	if (need_unlock)
  		gfs2_glock_dq_uninit(&gh);
  	return acl;
  }
  
  int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)

  {

  	int error;

  	size_t len;

  	char *data;
  	const char *name = gfs2_acl_name(type);

  	if (acl) {

  		len = posix_acl_xattr_size(acl->a_count);

  		data = kmalloc(len, GFP_NOFS);
  		if (data == NULL)
  			return -ENOMEM;
  		error = posix_acl_to_xattr(&init_user_ns, acl, data, len);
  		if (error < 0)
  			goto out;
  	} else {
  		data = NULL;
  		len = 0;

  	}

  
  	error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
  	if (error)
  		goto out;

  	set_cached_acl(inode, type, acl);

  out:

  	kfree(data);

  	return error;
  }

  
  int gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
  {
  	struct gfs2_inode *ip = GFS2_I(inode);
  	struct gfs2_holder gh;
  	bool need_unlock = false;
  	int ret;

  	umode_t mode;

  	if (acl && acl->a_count > GFS2_ACL_MAX_ENTRIES(GFS2_SB(inode)))
  		return -E2BIG;

  	ret = gfs2_qa_get(ip);

  	if (ret)
  		return ret;
  
  	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
  		ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
  		if (ret)

  			goto out;

  		need_unlock = true;
  	}

  	mode = inode->i_mode;
  	if (type == ACL_TYPE_ACCESS && acl) {
  		ret = posix_acl_update_mode(inode, &mode, &acl);

  		if (ret)
  			goto unlock;

  	}

  	ret = __gfs2_set_acl(inode, acl, type);

  	if (!ret && mode != inode->i_mode) {

  		inode->i_ctime = current_time(inode);

  		inode->i_mode = mode;
  		mark_inode_dirty(inode);
  	}

  unlock:

  	if (need_unlock)
  		gfs2_glock_dq_uninit(&gh);

  out:
  	gfs2_qa_put(ip);

  	return ret;
  }