• Sasha Levin's avatar
    init: don't try mounting device as nfs root unless type fully matches · 377485f6
    Sasha Levin authored
    Currently, we'll try mounting any device who's major device number is
    UNNAMED_MAJOR as NFS root.  This would happen for non-NFS devices as
    well (such as 9p devices) but it wouldn't cause any issues since
    mounting the device as NFS would fail quickly and the code proceeded to
    doing the proper mount:
    
           [  101.522716] VFS: Unable to mount root fs via NFS, trying floppy.
           [  101.534499] VFS: Mounted root (9p filesystem) on device 0:18.
    
    Commit 6829a048102a ("NFS: Retry mounting NFSROOT") introduced retries
    when mounting NFS root, which means that now we don't immediately fail
    and instead it takes an additional 90+ seconds until we stop retrying,
    which has revealed the issue this patch fixes.
    
    This meant that it would take an additional 90 seconds to boot when
    we're not using a device type which gets detected in order before NFS.
    
    This patch modifies the NFS type check to require device type to be
    'Root_NFS' instead of requiring the device to have an UNNAMED_MAJOR
    major.  This makes boot process cleaner since we now won't go through
    the NFS mounting code at all when the device isn't an NFS root
    ("/dev/nfs").
    Signed-off-by: default avatarSasha Levin <levinsasha928@gmail.com>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    377485f6
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