• Omar Sandoval's avatar
    debugfs: add debugfs_lookup() · a7c5437b
    Omar Sandoval authored
    We don't always have easy access to the dentry of a file or directory we
    created in debugfs. Add a helper which allows us to get a dentry we
    previously created.
    
    The motivation for this change is a problem with blktrace and the blk-mq
    debugfs entries introduced in 07e4fead ("blk-mq: create debugfs
    directory tree"). Namely, in some cases, the directory that blktrace
    needs to create may already exist, but in other cases, it may not. We
    _could_ rely on a bunch of implied knowledge to decide whether to create
    the directory or not, but it's much cleaner on our end to just look it
    up.
    Signed-off-by: default avatarOmar Sandoval <osandov@fb.com>
    Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    a7c5437b
inode.c 23.6 KB