From fd3e007f6c6a0f677e4ee8aca4b9bab8ad6cab9a Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 30 May 2019 17:48:35 -0400 Subject: don't bother with registering rootfs init_mount_tree() can get to rootfs_fs_type directly and that simplifies a lot of things. We don't need to register it, we don't need to look it up *and* we don't need to bother with preventing subsequent userland mounts. That's the way we should've done that from the very beginning. There is a user-visible change, namely the disappearance of "rootfs" from /proc/filesystems. Note that it's been unmountable all along and it didn't show up in /proc/mounts; however, it *is* a user-visible change and theoretically some script might've been using its presence in /proc/filesystems to tell 2.4.11+ from earlier kernels. *IF* any complaints about behaviour change do show up, we could fake it in /proc/filesystems. I very much doubt we'll have to, though. Signed-off-by: Al Viro --- init/do_mounts.c | 15 ++------------- 1 file changed, 2 insertions(+), 13 deletions(-) (limited to 'init/do_mounts.c') diff --git a/init/do_mounts.c b/init/do_mounts.c index c170d8b309b1..e7f0b0f18cce 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -629,19 +629,15 @@ static bool is_tmpfs; static struct dentry *rootfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { - static unsigned long once; void *fill = ramfs_fill_super; - if (test_and_set_bit(0, &once)) - return ERR_PTR(-ENODEV); - if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) fill = shmem_fill_super; return mount_nodev(fs_type, flags, data, fill); } -static struct file_system_type rootfs_fs_type = { +struct file_system_type rootfs_fs_type = { .name = "rootfs", .mount = rootfs_mount, .kill_sb = kill_litter_super, @@ -649,19 +645,12 @@ static struct file_system_type rootfs_fs_type = { int __init init_rootfs(void) { - int err = register_filesystem(&rootfs_fs_type); - - if (err) - return err; + int err = 0; if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && (!root_fs_names || strstr(root_fs_names, "tmpfs"))) { err = shmem_init(); is_tmpfs = true; } - - if (err) - unregister_filesystem(&rootfs_fs_type); - return err; } -- cgit v1.2.3