fs: Import sdFAT version 2.4.5

[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / sdfat / xattr.c

diff --git a/fs/sdfat/xattr.c b/fs/sdfat/xattr.c
new file mode 100644 (file)
index 0000000..bd03735
--- /dev/null
+++ b/fs/sdfat/xattr.c
@@ -0,0 +1,142 @@
+/*
+ *  Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/************************************************************************/
+/*                                                                      */
+/*  PROJECT : exFAT & FAT12/16/32 File System                           */
+/*  FILE    : xattr.c                                                   */
+/*  PURPOSE : sdFAT code for supporting xattr(Extended File Attributes) */
+/*                                                                      */
+/*----------------------------------------------------------------------*/
+/*  NOTES                                                               */
+/*                                                                      */
+/*                                                                      */
+/************************************************************************/
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/xattr.h>
+#include <linux/dcache.h>
+#include "sdfat.h"
+
+#ifndef CONFIG_SDFAT_VIRTUAL_XATTR_SELINUX_LABEL
+#define CONFIG_SDFAT_VIRTUAL_XATTR_SELINUX_LABEL       ("undefined")
+#endif
+
+static const char default_xattr[] = CONFIG_SDFAT_VIRTUAL_XATTR_SELINUX_LABEL;
+
+static int can_support(const char *name)
+{
+       if (!name || strcmp(name, "security.selinux"))
+               return -1;
+       return 0;
+}
+
+ssize_t sdfat_listxattr(struct dentry *dentry, char *list, size_t size)
+{
+       return 0;
+}
+
+
+/*************************************************************************
+ * INNER FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY
+ *************************************************************************/
+static int __sdfat_xattr_check_support(const char *name)
+{
+       if (can_support(name))
+               return -EOPNOTSUPP;
+
+       return 0;
+}
+
+ssize_t __sdfat_getxattr(const char *name, void *value, size_t size)
+{
+       if (can_support(name))
+               return -EOPNOTSUPP;
+
+       if ((size > strlen(default_xattr)+1) && value)
+               strcpy(value, default_xattr);
+
+       return strlen(default_xattr);
+}
+
+
+/*************************************************************************
+ * FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY
+ *************************************************************************/
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
+#if defined(CONFIG_ANDROID) && (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0))
+static int sdfat_xattr_get(const struct xattr_handler *handler,
+               struct dentry *dentry, struct inode *inode,
+               const char *name, void *buffer, size_t size,
+               int flags)
+{
+       return __sdfat_getxattr(name, buffer, size);
+}
+#else
+static int sdfat_xattr_get(const struct xattr_handler *handler,
+               struct dentry *dentry, struct inode *inode,
+               const char *name, void *buffer, size_t size)
+{
+       return __sdfat_getxattr(name, buffer, size);
+}
+#endif
+
+static int sdfat_xattr_set(const struct xattr_handler *handler,
+               struct dentry *dentry, struct inode *inode,
+               const char *name, const void *value, size_t size,
+               int flags)
+{
+       return __sdfat_xattr_check_support(name);
+}
+
+const struct xattr_handler sdfat_xattr_handler = {
+       .prefix = "",  /* match anything */
+       .get = sdfat_xattr_get,
+       .set = sdfat_xattr_set,
+};
+
+const struct xattr_handler *sdfat_xattr_handlers[] = {
+       &sdfat_xattr_handler,
+       NULL
+};
+
+void setup_sdfat_xattr_handler(struct super_block *sb)
+{
+       sb->s_xattr = sdfat_xattr_handlers;
+}
+#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0) */
+int sdfat_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags)
+{
+       return __sdfat_xattr_check_support(name);
+}
+
+ssize_t sdfat_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
+{
+       return __sdfat_getxattr(name, value, size);
+}
+
+int sdfat_removexattr(struct dentry *dentry, const char *name)
+{
+       return __sdfat_xattr_check_support(name);
+}
+
+void setup_sdfat_xattr_handler(struct super_block *sb)
+{
+       /* DO NOTHING */
+}
+#endif