• Kent Overstreet's avatar
    bcachefs: Add ability to redirect log output · 2b41226d
    Kent Overstreet authored
    Upcoming patches are going to add two new ioctls for running fsck in the
    kernel, but pretending that we're running our normal userspace fsck.
    
    This patch adds some plumbing for redirecting our normal log messages
    away from the dmesg log to a thread_with_file file descriptor - via a
    struct log_output, which will be consumed by the fsck f_op's read method.
    
    The new ioctls will allow for running fsck in the kernel against an
    offline filesystem (without mounting it), and an online filesystem. For
    an offline filesystem we need a way to pass in a pointer to the
    log_output, which is done via a new hidden opts.h option.
    
    For online fsck, we can set c->output directly, but only want to
    redirect log messages from the thread running fsck - hence the new
    c->output_filter method.
    Signed-off-by: default avatarKent Overstreet <kent.overstreet@linux.dev>
    2b41226d
opts.h 18.5 KB