Remove duplicate initerofs_mount_root() call and redundant EROFS checks

[Copilot]

initerofs_mount_root() was called twice - synchronously in populate_rootfs() and asynchronously in do_populate_rootfs(). The synchronous path also moved security_initramfs_populated() which could affect existing initramfs functionality.

Changes

• Remove synchronous EROFS mount path in populate_rootfs() - Keep only the async path in do_populate_rootfs() which correctly handles built-in initramfs unpacking first and falls back to cpio on failure

• Remove redundant EROFS filesystem registration check - init_mount() will fail appropriately if EROFS isn't registered; no need to pre-check with get_fs_type()

• Preserve security_initramfs_populated() in original location - Remains at end of do_populate_rootfs(), not affected by initerofs path

Before/After

// Before: populate_rootfs() had duplicate detection + mount
static int __init populate_rootfs(void)
{
    if (IS_ENABLED(CONFIG_INITEROFS) && initrd_start &&
        !IS_ENABLED(CONFIG_INITRAMFS_FORCE) && initerofs_detect()) {
        if (initerofs_mount_root() == 0) {  // First call
            security_initramfs_populated();  // Moved here incorrectly
            ...
        }
    }
    // Then async schedules do_populate_rootfs which calls it again
}

// After: populate_rootfs() just schedules async work
static int __init populate_rootfs(void)
{
    initramfs_cookie = async_schedule_domain(do_populate_rootfs, ...);
    usermodehelper_enable();
    ...
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https /usr/lib/apt/methods/https nwind-tables r-strong sh y otection { trap "rm -rf .-o s .tmp_4060/tmp.o (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

In the last commit I am not sure of some of the changes, can you test to pick the best solution. initerofs_mount_root() is called twice. It should only be called once, pick the most optimal one to call. security_initramfs_populated() was moved. Why? We should not effect existing initramfs functionality. There is a section "Check for EROFS-based initramfs synchronously BEFORE scheduling", can we remove this completely? There is a "Verify EROFS filesystem is registered" section, do we need this at all? Test all changes thoroughly with a Fedora VM and lz4 compressed initerofs.

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