/*
?*?linux/fs/ext4/acl.c
?*
?*?Copyright?（C）?2001-2003?Andreas?Gruenbacher?
?*/

#include?
#include?
#include?
#include?
#include?
#include?“ext4_jbd2.h“
#include?“ext4.h“
#include?“xattr.h“
#include?“acl.h“

/*
?*?Convert?from?filesystem?to?in-memory?representation.
?*/
static?struct?posix_acl?*
ext4_acl_from_disk（const?void?*value?size_t?size）
{
	const?char?*end?=?（char?*）value?+?size;
	int?n?count;
	struct?posix_acl?*acl;

	if?（!value）
		return?NULL;
	if?（size?		?return?ERR_PTR（-EINVAL）;
	if?（（（ext4_acl_header?*）value）->a_version?!=
	????cpu_to_le32（EXT4_ACL_VERSION））
		return?ERR_PTR（-EINVAL）;
	value?=?（char?*）value?+?sizeof（ext4_acl_header）;
	count?=?ext4_acl_count（size）;
	if?（count?		return?ERR_PTR（-EINVAL）;
	if?（count?==?0）
		return?NULL;
	acl?=?posix_acl_alloc（count?GFP_NOFS）;
	if?（!acl）
		return?ERR_PTR（-ENOMEM）;
	for?（n?=?0;?n?		ext4_acl_entry?*entry?=
			（ext4_acl_entry?*）value;
		if?（（char?*）value?+?sizeof（ext4_acl_entry_short）?>?end）
			goto?fail;
		acl->a_entries[n].e_tag??=?le16_to_cpu（entry->e_tag）;
		acl->a_entries[n].e_perm?=?le16_to_cpu（entry->e_perm）;

		switch?（acl->a_entries[n].e_tag）?{
		case?ACL_USER_OBJ:
		case?ACL_GROUP_OBJ:
		case?ACL_MASK:
		case?ACL_OTHER:
			value?=?（char?*）value?+
				sizeof（ext4_acl_entry_short）;
			acl->a_entries[n].e_id?=?ACL_UNDEFINED_ID;
			break;

		case?ACL_USER:
		case?ACL_GROUP:
			value?=?（char?*）value?+?sizeof（ext4_acl_entry）;
			if?（（char?*）value?>?end）
				goto?fail;
			acl->a_entries[n].e_id?=
				le32_to_cpu（entry->e_id）;
			break;

		default:
			goto?fail;
		}
	}
	if?（value?!=?end）
		goto?fail;
	return?acl;

fail:
	posix_acl_release（acl）;
	return?ERR_PTR（-EINVAL）;
}

/*
?*?Convert?from?in-memory?to?filesystem?representation.
?*/
static?void?*
ext4_acl_to_disk（const?struct?posix_acl?*acl?size_t?*size）
{
	ext4_acl_header?*ext_acl;
	char?*e;
	size_t?n;

	*size?=?ext4_acl_size（acl->a_count）;
	ext_acl?=?kmalloc（sizeof（ext4_acl_header）?+?acl->a_count?*
			sizeof（ext4_acl_entry）?GFP_NOFS）;
	if?（!ext_acl）
		return?ERR_PTR（-ENOMEM）;
	ext_acl->a_version?=?cpu_to_le32（EXT4_ACL_VERSION）;
	e?=?（char?*）ext_acl?+?sizeof（ext4_acl_header）;
	for?（n?=?0;?n?a_count;?n++）?{
		ext4_acl_entry?*entry?=?（ext4_acl_entry?*）e;
		entry->e_tag??=?cpu_to_le16（acl->a_entries[n].e_tag）;
		entry->e_perm?=?cpu_to_le16（acl->a_entries[n].e_perm）;
		switch?（acl->a_entries[n].e_tag）?{
		case?ACL_USER:
		case?ACL_GROUP:
			entry->e_id?=?cpu_to_le32（acl->a_entries[n].e_id）;
			e?+=?sizeof（ext4_acl_entry）;
			break;

		case?ACL_USER_OBJ:
		case?ACL_GROUP_OBJ:
		case?ACL_MASK:
		case?ACL_OTHER:
			e?+=?sizeof（ext4_acl_entry_short）;
			break;

		default:
			goto?fail;
		}
	}
	return?（char?*）ext_acl;

fail:
	kfree（ext_acl）;
	return?ERR_PTR（-EINVAL）;
}

/*
?*?Inode?operation?get_posix_acl（）.
?*
?*?inode->i_mutex:?don‘t?care
?*/
static?struct?posix_acl?*
ext4_get_acl（struct?inode

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????11293??2012-10-08?05:41??ext4\acl.c

?????文件???????1543??2012-10-08?05:41??ext4\acl.h

?????文件??????22744??2012-10-08?05:41??ext4\balloc.c

?????文件????????672??2012-10-08?05:41??ext4\bitmap.c

?????文件???????6193??2012-10-08?05:41??ext4\block_validity.c

?????文件??????14032??2012-10-08?05:41??ext4\dir.c

?????文件??????67403??2012-10-08?05:41??ext4\ext4.h

?????文件???????8794??2012-10-08?05:41??ext4\ext4_extents.h

?????文件???????2355??2012-10-08?05:41??ext4\ext4_jbd2.c

?????文件??????10124??2012-10-08?05:41??ext4\ext4_jbd2.h

?????文件?????103877??2012-10-08?05:41??ext4\extents.c

?????文件???????4492??2012-10-08?05:41??ext4\file.c

?????文件???????4332??2012-10-08?05:41??ext4\fsync.c

?????文件???????4448??2012-10-08?05:41??ext4\hash.c

?????文件??????34683??2012-10-08?05:41??ext4\ialloc.c

?????文件?????175966??2012-10-08?05:41??ext4\inode.c

?????文件???????9723??2012-10-08?05:41??ext4\ioctl.c

?????文件???????2544??2012-10-08?05:41??ext4\Kconfig

?????文件????????452??2012-10-08?05:41??ext4\Makefile

?????文件?????129308??2012-10-08?05:41??ext4\mballoc.c

?????文件???????5873??2012-10-08?05:41??ext4\mballoc.h

?????文件??????15559??2012-10-08?05:41??ext4\migrate.c

?????文件??????41727??2012-10-08?05:41??ext4\move_extent.c

?????文件??????71324??2012-10-08?05:41??ext4\namei.c

?????文件??????34936??2012-10-08?05:41??ext4\resize.c

?????文件?????116013??2012-10-08?05:41??ext4\super.c

?????文件???????1338??2012-10-08?05:41??ext4\symlink.c

?????文件??????43076??2012-10-08?05:41??ext4\xattr.c

?????文件???????4387??2012-10-08?05:41??ext4\xattr.h

?????文件???????1837??2012-10-08?05:41??ext4\xattr_security.c

............此處省略6個文件信息