From 2673cd7d09df7701fc5ca381864a9770a63fa069 Mon Sep 17 00:00:00 2001 From: Samuel Thibault Date: Tue, 9 Feb 2021 19:53:28 +0100 Subject: Note about the fsys_startup call now done by libdiskfs --- hurd/bootstrap.mdwn | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) (limited to 'hurd') diff --git a/hurd/bootstrap.mdwn b/hurd/bootstrap.mdwn index 83ad3218..2e70bbc7 100644 --- a/hurd/bootstrap.mdwn +++ b/hurd/bootstrap.mdwn @@ -83,12 +83,6 @@ ext2fs then calls `diskfs_startup_diskfs` to really run the startup. Since the bootstrap port is `MACH_PORT_NULL`, `diskfs_startup_diskfs` calls `diskfs_start_bootstrap`. -TODO: we want `diskfs_startup_diskfs` to also call `task_get_bootstrap_port` to -call `fsys_startup` on its real bootstrap port once `diskfs_start_bootstrap` is -finished, for bootstrap translators before the root filesystem to know when the -root filesystem is ready, and register themselves as translators in the root -filesystem, register for shutdown notification, etc. - `diskfs_start_bootstrap` starts by creating a open port on itself for the current and root directory, all other processes will inherit it. @@ -125,12 +119,23 @@ it to `/servers/exec`. be specified on the multiboot command line, but otherwise it will default to `/hurd/startup`. -Now that exec is up and running, the startup process can be created with +Now that exec is up and running, the `startup` process can be created with `exec_exec`. `diskfs_start_bootstrap` takes a lot of care in this: this is the first unix-looking process, it notably inherits the root directory and current working directory initialized above, it gets stdin/out/err on the mach console. It is passed as bootstrap port a port from the `diskfs_control_class`. +`diskfs_start_bootstrap` is complete, we are back to `diskfs_startup_diskfs`, +which checks whether ext2fs was given a bootstrap port, i.e. a translator +was started before ext2fs. If so, it calls `diskfs_call_fsys_startup` which +creates a new control port and passes it do a call to `fsys_startup` on the +bootstrap port, so the translator that was started before ext2fs gets access to +the ext2fs filesystem. That translator however does not return any real port, +since we are not exposing the ext2fs filesystem in that translator's filesystem, +but rather the converse. That translator will wait for an `fsys_init` call to +complete its own initialization and set itself as an active translator within +the ext2fs filesystem. + # startup startup's `main` function starts and calls `task_get_bootstrap_port` to get its -- cgit v1.2.3