143 lines
4.4 KiB
C
143 lines
4.4 KiB
C
/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/************************************************************************/
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/* */
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/* PROJECT : exFAT & FAT12/16/32 File System */
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/* FILE : xattr.c */
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/* PURPOSE : sdFAT code for supporting xattr(Extended File Attributes) */
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/* */
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/*----------------------------------------------------------------------*/
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/* NOTES */
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/* */
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/* */
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/************************************************************************/
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/xattr.h>
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#include <linux/dcache.h>
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#include "sdfat.h"
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#ifndef CONFIG_SDFAT_VIRTUAL_XATTR_SELINUX_LABEL
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#define CONFIG_SDFAT_VIRTUAL_XATTR_SELINUX_LABEL ("undefined")
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#endif
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static const char default_xattr[] = CONFIG_SDFAT_VIRTUAL_XATTR_SELINUX_LABEL;
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static int can_support(const char *name)
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{
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if (!name || strcmp(name, "security.selinux"))
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return -1;
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return 0;
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}
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ssize_t sdfat_listxattr(struct dentry *dentry, char *list, size_t size)
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{
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return 0;
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}
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/*************************************************************************
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* INNER FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY
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*************************************************************************/
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static int __sdfat_xattr_check_support(const char *name)
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{
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if (can_support(name))
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return -EOPNOTSUPP;
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return 0;
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}
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ssize_t __sdfat_getxattr(const char *name, void *value, size_t size)
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{
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if (can_support(name))
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return -EOPNOTSUPP;
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if ((size > strlen(default_xattr)+1) && value)
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strcpy(value, default_xattr);
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return strlen(default_xattr);
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}
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/*************************************************************************
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* FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY
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*************************************************************************/
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
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#if defined(CONFIG_ANDROID) && (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0))
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static int sdfat_xattr_get(const struct xattr_handler *handler,
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struct dentry *dentry, struct inode *inode,
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const char *name, void *buffer, size_t size,
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int flags)
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{
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return __sdfat_getxattr(name, buffer, size);
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}
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#else
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static int sdfat_xattr_get(const struct xattr_handler *handler,
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struct dentry *dentry, struct inode *inode,
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const char *name, void *buffer, size_t size)
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{
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return __sdfat_getxattr(name, buffer, size);
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}
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#endif
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static int sdfat_xattr_set(const struct xattr_handler *handler,
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struct dentry *dentry, struct inode *inode,
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const char *name, const void *value, size_t size,
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int flags)
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{
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return __sdfat_xattr_check_support(name);
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}
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const struct xattr_handler sdfat_xattr_handler = {
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.prefix = "", /* match anything */
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.get = sdfat_xattr_get,
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.set = sdfat_xattr_set,
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};
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const struct xattr_handler *sdfat_xattr_handlers[] = {
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&sdfat_xattr_handler,
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NULL
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};
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void setup_sdfat_xattr_handler(struct super_block *sb)
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{
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sb->s_xattr = sdfat_xattr_handlers;
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}
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#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0) */
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int sdfat_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags)
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{
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return __sdfat_xattr_check_support(name);
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}
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ssize_t sdfat_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
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{
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return __sdfat_getxattr(name, value, size);
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}
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int sdfat_removexattr(struct dentry *dentry, const char *name)
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{
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return __sdfat_xattr_check_support(name);
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}
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void setup_sdfat_xattr_handler(struct super_block *sb)
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{
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/* DO NOTHING */
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}
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#endif
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