CacheFiles: Better showing of debugging information in active object problems
Show more debugging information if cachefiles_mark_object_active() is asked to activate an active object. This may happen, for instance, if the netfs tries to register an object with the same key multiple times. The code is changed to (a) get the appropriate object lock to protect the cookie pointer whilst we dereference it, and (b) get and display the cookie key if available. Signed-off-by: David Howells <dhowells@redhat.com>
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@ -27,6 +27,76 @@ static int cachefiles_wait_bit(void *flags)
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return 0;
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}
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#define CACHEFILES_KEYBUF_SIZE 512
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/*
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* dump debugging info about an object
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*/
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static noinline
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void __cachefiles_printk_object(struct cachefiles_object *object,
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const char *prefix,
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u8 *keybuf)
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{
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struct fscache_cookie *cookie;
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unsigned keylen, loop;
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printk(KERN_ERR "%sobject: OBJ%x\n",
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prefix, object->fscache.debug_id);
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printk(KERN_ERR "%sobjstate=%s fl=%lx swfl=%lx ev=%lx[%lx]\n",
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prefix, fscache_object_states[object->fscache.state],
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object->fscache.flags, object->fscache.work.flags,
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object->fscache.events,
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object->fscache.event_mask & FSCACHE_OBJECT_EVENTS_MASK);
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printk(KERN_ERR "%sops=%u inp=%u exc=%u\n",
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prefix, object->fscache.n_ops, object->fscache.n_in_progress,
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object->fscache.n_exclusive);
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printk(KERN_ERR "%sparent=%p\n",
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prefix, object->fscache.parent);
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spin_lock(&object->fscache.lock);
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cookie = object->fscache.cookie;
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if (cookie) {
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printk(KERN_ERR "%scookie=%p [pr=%p nd=%p fl=%lx]\n",
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prefix,
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object->fscache.cookie,
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object->fscache.cookie->parent,
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object->fscache.cookie->netfs_data,
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object->fscache.cookie->flags);
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if (keybuf)
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keylen = cookie->def->get_key(cookie->netfs_data, keybuf,
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CACHEFILES_KEYBUF_SIZE);
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else
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keylen = 0;
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} else {
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printk(KERN_ERR "%scookie=NULL\n", prefix);
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keylen = 0;
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}
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spin_unlock(&object->fscache.lock);
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if (keylen) {
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printk(KERN_ERR "%skey=[%u] '", prefix, keylen);
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for (loop = 0; loop < keylen; loop++)
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printk("%02x", keybuf[loop]);
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printk("'\n");
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}
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}
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/*
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* dump debugging info about a pair of objects
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*/
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static noinline void cachefiles_printk_object(struct cachefiles_object *object,
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struct cachefiles_object *xobject)
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{
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u8 *keybuf;
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keybuf = kmalloc(CACHEFILES_KEYBUF_SIZE, GFP_NOIO);
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if (object)
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__cachefiles_printk_object(object, "", keybuf);
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if (xobject)
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__cachefiles_printk_object(xobject, "x", keybuf);
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kfree(keybuf);
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}
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/*
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* record the fact that an object is now active
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*/
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@ -42,8 +112,11 @@ static void cachefiles_mark_object_active(struct cachefiles_cache *cache,
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try_again:
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write_lock(&cache->active_lock);
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if (test_and_set_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags))
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if (test_and_set_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags)) {
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printk(KERN_ERR "CacheFiles: Error: Object already active\n");
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cachefiles_printk_object(object, NULL);
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BUG();
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}
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dentry = object->dentry;
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_p = &cache->active_nodes.rb_node;
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@ -76,32 +149,7 @@ wait_for_old_object:
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printk(KERN_ERR "\n");
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printk(KERN_ERR "CacheFiles: Error:"
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" Unexpected object collision\n");
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printk(KERN_ERR "xobject: OBJ%x\n",
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xobject->fscache.debug_id);
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printk(KERN_ERR "xobjstate=%s\n",
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fscache_object_states[xobject->fscache.state]);
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printk(KERN_ERR "xobjflags=%lx\n", xobject->fscache.flags);
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printk(KERN_ERR "xobjevent=%lx [%lx]\n",
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xobject->fscache.events, xobject->fscache.event_mask);
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printk(KERN_ERR "xops=%u inp=%u exc=%u\n",
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xobject->fscache.n_ops, xobject->fscache.n_in_progress,
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xobject->fscache.n_exclusive);
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printk(KERN_ERR "xcookie=%p [pr=%p nd=%p fl=%lx]\n",
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xobject->fscache.cookie,
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xobject->fscache.cookie->parent,
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xobject->fscache.cookie->netfs_data,
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xobject->fscache.cookie->flags);
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printk(KERN_ERR "xparent=%p\n",
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xobject->fscache.parent);
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printk(KERN_ERR "object: OBJ%x\n",
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object->fscache.debug_id);
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printk(KERN_ERR "cookie=%p [pr=%p nd=%p fl=%lx]\n",
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object->fscache.cookie,
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object->fscache.cookie->parent,
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object->fscache.cookie->netfs_data,
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object->fscache.cookie->flags);
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printk(KERN_ERR "parent=%p\n",
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object->fscache.parent);
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cachefiles_printk_object(object, xobject);
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BUG();
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}
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atomic_inc(&xobject->usage);
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