I can not figure out how the following code actually works.
Probably I am missing something in the big picture (again).
if (HDR_L2_WRITE_HEAD(ab)) {
/*
* We hit a write head node. Leave it for
* l2arc_write_done().
*/
list_remove(buflist, ab);
mutex_exit(hash_lock);
continue;
}
So, the write head is left in memory, but it is still removed from l2ad_buflist.
Supposing there is a corresponding L2 write zio in progress there will be a call
to l2arc_write_done() with l2wcb_head pointing to the head.
Wouldn't
list_prev(buflist, head)
result in an illegal memory access if head is not on buflist?
Thanks!
--
Andriy Gapon
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