• David Howells's avatar
    FS-Cache: Allow the current state of all objects to be dumped · 4fbf4291
    David Howells authored
    Allow the current state of all fscache objects to be dumped by doing:
    
    	cat /proc/fs/fscache/objects
    
    By default, all objects and all fields will be shown.  This can be restricted
    by adding a suitable key to one of the caller's keyrings (such as the session
    keyring):
    
    	keyctl add user fscache:objlist "<restrictions>" @s
    
    The <restrictions> are:
    
    	K	Show hexdump of object key (don't show if not given)
    	A	Show hexdump of object aux data (don't show if not given)
    
    And paired restrictions:
    
    	C	Show objects that have a cookie
    	c	Show objects that don't have a cookie
    	B	Show objects that are busy
    	b	Show objects that aren't busy
    	W	Show objects that have pending writes
    	w	Show objects that don't have pending writes
    	R	Show objects that have outstanding reads
    	r	Show objects that don't have outstanding reads
    	S	Show objects that have slow work queued
    	s	Show objects that don't have slow work queued
    
    If neither side of a restriction pair is given, then both are implied.  For
    example:
    
    	keyctl add user fscache:objlist KB @s
    
    shows objects that are busy, and lists their object keys, but does not dump
    their auxiliary data.  It also implies "CcWwRrSs", but as 'B' is given, 'b' is
    not implied.
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    4fbf4291