dm cache: resolve small nits and improve Documentation

Document passthrough mode, cache shrinking, and cache invalidation.
Also, use strcasecmp() and hlist_unhashed().

Reported-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/drivers/md/dm-cache-policy-mq.c b/drivers/md/dm-cache-policy-mq.c
index 7209fab8b8ed..416b7b752a6e 100644
--- a/drivers/md/dm-cache-policy-mq.c
+++ b/drivers/md/dm-cache-policy-mq.c
@@ -310,7 +310,7 @@ static void free_entry(struct entry_pool *ep, struct entry *e)
 static struct entry *epool_find(struct entry_pool *ep, dm_cblock_t cblock)
 {
         struct entry *e = ep->entries + from_cblock(cblock);
-        return e->hlist.pprev ? e : NULL;
+        return !hlist_unhashed(&e->hlist) ? e : NULL;
 }
 
 static bool epool_empty(struct entry_pool *ep)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 41e664b474f1..9efcf1059b99 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -3057,7 +3057,7 @@ static int cache_message(struct dm_target *ti, unsigned argc, char **argv)
         if (!argc)
                 return -EINVAL;
 
-        if (!strcmp(argv[0], "invalidate_cblocks"))
+        if (!strcasecmp(argv[0], "invalidate_cblocks"))
                 return process_invalidate_cblocks_message(cache, argc - 1, (const char **) argv + 1);
 
         if (argc != 2)