JFFS2: Add notes on inocache_lock spinlock to README.Locking

Signed-off-by: Artem Bityuckiy <dedekind@infradead.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

fs/jffs2/README.Locking

-	$Id: README.Locking,v 1.4 2002/03/08 16:20:06 dwmw2 Exp $
+	$Id: README.Locking,v 1.8 2004/11/14 11:43:41 dedekind Exp $
 
 	JFFS2 LOCKING DOCUMENTATION
 	---------------------------
@@ -80,10 +80,10 @@ per-eraseblock lists of physical jffs2_raw_node_ref structures, and
 (NB) the per-inode list of physical nodes. The latter is a special
 case - see below.
 
-As the MTD API permits erase-completion callback functions to be
-called from bottom-half (timer) context, and these functions access
-the data structures protected by this lock, it must be locked with
-spin_lock_bh().
+As the MTD API no longer permits erase-completion callback functions
+to be called from bottom-half (timer) context (on the basis that nobody
+ever actually implemented such a thing), it's now sufficient to use
+a simple spin_lock() rather than spin_lock_bh().
 
 Note that the per-inode list of physical nodes (f->nodes) is a special
 case. Any changes to _valid_ nodes (i.e. ->flash_offset & 1 == 0) in
@@ -99,8 +99,27 @@ pointer when the garbage collection thread exits. The code to kill the
 GC thread locks it, sends the signal, then unlocks it - while the GC
 thread itself locks it, zeroes c->gc_task, then unlocks on the exit path.
 
-	node_free_sem
-	-------------
+
+	inocache_lock spinlock
+	----------------------
+
+This spinlock protects the hashed list (c->inocache_list) of the
+in-core jffs2_inode_cache objects (each inode in JFFS2 has the
+correspondent jffs2_inode_cache object). So, the inocache_lock
+has to be locked while walking the c->inocache_list hash buckets.
+
+Note, the f->sem guarantees that the correspondent jffs2_inode_cache
+will not be removed. So, it is allowed to access it without locking
+the inocache_lock spinlock. 
+
+Ordering constraints: 
+
+	If both erase_completion_lock and inocache_lock are needed, the
+	c->erase_completion has to be acquired first.
+
+
+	erase_free_sem
+	--------------
 
 This semaphore is only used by the erase code which frees obsolete
 node references and the jffs2_garbage_collect_deletion_dirent()