zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/reiserfs/xattr_security.c b/ap/os/linux/linux-3.4.x/fs/reiserfs/xattr_security.c
new file mode 100644
index 0000000..800a3ce
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/reiserfs/xattr_security.c
@@ -0,0 +1,120 @@
+#include "reiserfs.h"
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/xattr.h>
+#include <linux/slab.h>
+#include "xattr.h"
+#include <linux/security.h>
+#include <asm/uaccess.h>
+
+static int
+security_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
+ int handler_flags)
+{
+ if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
+ return -EINVAL;
+
+ if (IS_PRIVATE(dentry->d_inode))
+ return -EPERM;
+
+ return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
+}
+
+static int
+security_set(struct dentry *dentry, const char *name, const void *buffer,
+ size_t size, int flags, int handler_flags)
+{
+ if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
+ return -EINVAL;
+
+ if (IS_PRIVATE(dentry->d_inode))
+ return -EPERM;
+
+ return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
+}
+
+static size_t security_list(struct dentry *dentry, char *list, size_t list_len,
+ const char *name, size_t namelen, int handler_flags)
+{
+ const size_t len = namelen + 1;
+
+ if (IS_PRIVATE(dentry->d_inode))
+ return 0;
+
+ if (list && len <= list_len) {
+ memcpy(list, name, namelen);
+ list[namelen] = '\0';
+ }
+
+ return len;
+}
+
+/* Initializes the security context for a new inode and returns the number
+ * of blocks needed for the transaction. If successful, reiserfs_security
+ * must be released using reiserfs_security_free when the caller is done. */
+int reiserfs_security_init(struct inode *dir, struct inode *inode,
+ const struct qstr *qstr,
+ struct reiserfs_security_handle *sec)
+{
+ int blocks = 0;
+ int error;
+
+ sec->name = NULL;
+
+ /* Don't add selinux attributes on xattrs - they'll never get used */
+ if (IS_PRIVATE(dir))
+ return 0;
+
+ error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
+ &sec->value, &sec->length);
+ if (error) {
+ if (error == -EOPNOTSUPP)
+ error = 0;
+
+ sec->name = NULL;
+ sec->value = NULL;
+ sec->length = 0;
+ return error;
+ }
+
+ if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
+ blocks = reiserfs_xattr_jcreate_nblocks(inode) +
+ reiserfs_xattr_nblocks(inode, sec->length);
+ /* We don't want to count the directories twice if we have
+ * a default ACL. */
+ REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
+ }
+ return blocks;
+}
+
+int reiserfs_security_write(struct reiserfs_transaction_handle *th,
+ struct inode *inode,
+ struct reiserfs_security_handle *sec)
+{
+ int error;
+ if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
+ return -EINVAL;
+
+ error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
+ sec->length, XATTR_CREATE);
+ if (error == -ENODATA || error == -EOPNOTSUPP)
+ error = 0;
+
+ return error;
+}
+
+void reiserfs_security_free(struct reiserfs_security_handle *sec)
+{
+ kfree(sec->name);
+ kfree(sec->value);
+ sec->name = NULL;
+ sec->value = NULL;
+}
+
+const struct xattr_handler reiserfs_xattr_security_handler = {
+ .prefix = XATTR_SECURITY_PREFIX,
+ .get = security_get,
+ .set = security_set,
+ .list = security_list,
+};