sys/kern: Add VFS support

- Refactor the libio interface

- Move syscalls into an rtemsbsd location

- Provide a root directory mount point

Update #4475

rtemsbsd/include/machine/rtems-bsd-vfs.h

@@ -0,0 +1,82 @@
+/**
+ * @file
+ *
+ * @ingroup rtems_bsd_machine
+ *
+ * @brief TODO.
+ */
+
+/*
+ * Copyright (C) 2020 Chris Johns <chris@contemporary.software>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _RTEMS_BSD_MACHINE_RTEMS_BSD_VFS_H_
+#define _RTEMS_BSD_MACHINE_RTEMS_BSD_VFS_H_
+
+#include <rtems/libio.h>
+
+extern const rtems_filesystem_operations_table rtems_bsd_vfsops;
+
+int rtems_bsd_vfs_mount_init(rtems_filesystem_mount_table_entry_t *mt_entry);
+
+void rtems_bsd_vfs_mt_entry_lock(
+    const rtems_filesystem_mount_table_entry_t *mt_entry);
+void rtems_bsd_vfs_mt_entry_unlock(
+    const rtems_filesystem_mount_table_entry_t *mt_entry);
+void rtems_bsd_vfs_eval_path(rtems_filesystem_eval_path_context_t *ctx);
+bool rtems_bsd_vfs_are_nodes_equal(const rtems_filesystem_location_info_t *a,
+    const rtems_filesystem_location_info_t *b);
+int rtems_bsd_vfs_link(const rtems_filesystem_location_info_t *parentloc,
+    const rtems_filesystem_location_info_t *targetloc, const char *name,
+    size_t namelen);
+int rtems_bsd_vfs_fchmod(
+    const rtems_filesystem_location_info_t *loc, mode_t mode);
+int rtems_bsd_vfs_chown(
+    const rtems_filesystem_location_info_t *loc, uid_t owner, gid_t group);
+int rtems_bsd_vfs_clonenode(rtems_filesystem_location_info_t *loc);
+void rtems_bsd_vfs_freenode(const rtems_filesystem_location_info_t *loc);
+int rtems_bsd_vfs_mount(rtems_filesystem_mount_table_entry_t *mt_entry);
+int rtems_bsd_vfs_fsmount_me(
+    rtems_filesystem_mount_table_entry_t *mt_entry, const void *data);
+int rtems_bsd_vfs_unmount(rtems_filesystem_mount_table_entry_t *mt_entry);
+void rtems_bsd_vfs_fsunmount_me(rtems_filesystem_mount_table_entry_t *mt_entry);
+int rtems_bsd_vfs_mknod(const rtems_filesystem_location_info_t *parentloc,
+    const char *name, size_t namelen, mode_t mode, dev_t dev);
+int rtems_bsd_vfs_rmnod(const rtems_filesystem_location_info_t *parentloc,
+    const rtems_filesystem_location_info_t *loc);
+int rtems_bsd_vfs_utimens(
+    const rtems_filesystem_location_info_t *loc, time_t actime, time_t modtime);
+int rtems_bsd_vfs_symlink(const rtems_filesystem_location_info_t *parentloc,
+    const char *name, size_t namelen, const char *target);
+ssize_t rtems_bsd_vfs_readlink(
+    const rtems_filesystem_location_info_t *loc, char *buf, size_t bufsize);
+int rtems_bsd_vfs_rename(const rtems_filesystem_location_info_t *oldparentloc,
+    const rtems_filesystem_location_info_t *oldloc,
+    const rtems_filesystem_location_info_t *newparentloc, const char *name,
+    size_t namelen);
+int rtems_bsd_vfs_statvfs(
+    const rtems_filesystem_location_info_t *loc, struct statvfs *buf);
+
+#endif /* _RTEMS_BSD_MACHINE_RTEMS_BSD_VFS_H_ */