1 files changed, 140 insertions, 0 deletions
diff --git a/fs/hfsplus/posix_acl.c b/fs/hfsplus/posix_acl.c
new file mode 100644
index 000000000..df0c9af68
--- /dev/null
+++ b/fs/hfsplus/posix_acl.c
@@ -0,0 +1,140 @@
+/*
+ * linux/fs/hfsplus/posix_acl.c
+ *
+ * Vyacheslav Dubeyko <slava@dubeyko.com>
+ *
+ * Handler for Posix Access Control Lists (ACLs) support.
+ */
+
+#include "hfsplus_fs.h"
+#include "xattr.h"
+#include "acl.h"
+
+struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type)
+{
+	struct posix_acl *acl;
+	char *xattr_name;
+	char *value = NULL;
+	ssize_t size;
+
+	hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
+
+	switch (type) {
+	case ACL_TYPE_ACCESS:
+		xattr_name = POSIX_ACL_XATTR_ACCESS;
+		break;
+	case ACL_TYPE_DEFAULT:
+		xattr_name = POSIX_ACL_XATTR_DEFAULT;
+		break;
+	default:
+		return ERR_PTR(-EINVAL);
+	}
+
+	size = __hfsplus_getxattr(inode, xattr_name, NULL, 0);
+
+	if (size > 0) {
+		value = (char *)hfsplus_alloc_attr_entry();
+		if (unlikely(!value))
+			return ERR_PTR(-ENOMEM);
+		size = __hfsplus_getxattr(inode, xattr_name, value, size);
+	}
+
+	if (size > 0)
+		acl = posix_acl_from_xattr(&init_user_ns, value, size);
+	else if (size == -ENODATA)
+		acl = NULL;
+	else
+		acl = ERR_PTR(size);
+
+	hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
+
+	if (!IS_ERR(acl))
+		set_cached_acl(inode, type, acl);
+
+	return acl;
+}
+
+int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl,
+		int type)
+{
+	int err;
+	char *xattr_name;
+	size_t size = 0;
+	char *value = NULL;
+
+	hfs_dbg(ACL_MOD, "[%s]: ino %lu\n", __func__, inode->i_ino);
+
+	switch (type) {
+	case ACL_TYPE_ACCESS:
+		xattr_name = POSIX_ACL_XATTR_ACCESS;
+		if (acl) {
+			err = posix_acl_equiv_mode(acl, &inode->i_mode);
+			if (err < 0)
+				return err;
+		}
+		err = 0;
+		break;
+
+	case ACL_TYPE_DEFAULT:
+		xattr_name = POSIX_ACL_XATTR_DEFAULT;
+		if (!S_ISDIR(inode->i_mode))
+			return acl ? -EACCES : 0;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	if (acl) {
+		size = posix_acl_xattr_size(acl->a_count);
+		if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE))
+			return -ENOMEM;
+		value = (char *)hfsplus_alloc_attr_entry();
+		if (unlikely(!value))
+			return -ENOMEM;
+		err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
+		if (unlikely(err < 0))
+			goto end_set_acl;
+	}
+
+	err = __hfsplus_setxattr(inode, xattr_name, value, size, 0);
+
+end_set_acl:
+	hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
+
+	if (!err)
+		set_cached_acl(inode, type, acl);
+
+	return err;
+}
+
+int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
+{
+	int err = 0;
+	struct posix_acl *default_acl, *acl;
+
+	hfs_dbg(ACL_MOD,
+		"[%s]: ino %lu, dir->ino %lu\n",
+		__func__, inode->i_ino, dir->i_ino);
+
+	if (S_ISLNK(inode->i_mode))
+		return 0;
+
+	err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
+	if (err)
+		return err;
+
+	if (default_acl) {
+		err = hfsplus_set_posix_acl(inode, default_acl,
+					    ACL_TYPE_DEFAULT);
+		posix_acl_release(default_acl);
+	}
+
+	if (acl) {
+		if (!err)
+			err = hfsplus_set_posix_acl(inode, acl,
+						    ACL_TYPE_ACCESS);
+		posix_acl_release(acl);
+	}
+	return err;
+}