Merge tag 'for-6.0/dm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - A few fixes for the DM verity and bufio changes in this merge window

 - A smatch warning fix for DM writecache locking in writecache_map

* tag 'for-6.0/dm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm bufio: fix some cases where the code sleeps with spinlock held
  dm writecache: fix smatch warning about invalid return from writecache_map
  dm verity: fix verity_parse_opt_args parsing
  dm verity: fix DM_VERITY_OPTS_MAX value yet again
  dm bufio: simplify DM_BUFIO_CLIENT_NO_SLEEP locking

Author: torvalds

drivers/md/dm-bufio.c

@@ -83,7 +83,7 @@
 struct dm_bufio_client {
 	struct mutex lock;
 	spinlock_t spinlock;
-	unsigned long spinlock_flags;
+	bool no_sleep;
 
 	struct list_head lru[LIST_SIZE];
 	unsigned long n_buffers[LIST_SIZE];
@@ -93,8 +93,6 @@ struct dm_bufio_client {
 	s8 sectors_per_block_bits;
 	void (*alloc_callback)(struct dm_buffer *);
 	void (*write_callback)(struct dm_buffer *);
-	bool no_sleep;
-
 	struct kmem_cache *slab_buffer;
 	struct kmem_cache *slab_cache;
 	struct dm_io_client *dm_io;
@@ -174,23 +172,23 @@ static DEFINE_STATIC_KEY_FALSE(no_sleep_enabled);
 static void dm_bufio_lock(struct dm_bufio_client *c)
 {
 	if (static_branch_unlikely(&no_sleep_enabled) && c->no_sleep)
-		spin_lock_irqsave_nested(&c->spinlock, c->spinlock_flags, dm_bufio_in_request());
+		spin_lock_bh(&c->spinlock);
 	else
 		mutex_lock_nested(&c->lock, dm_bufio_in_request());
 }
 
 static int dm_bufio_trylock(struct dm_bufio_client *c)
 {
 	if (static_branch_unlikely(&no_sleep_enabled) && c->no_sleep)
-		return spin_trylock_irqsave(&c->spinlock, c->spinlock_flags);
+		return spin_trylock_bh(&c->spinlock);
 	else
 		return mutex_trylock(&c->lock);
 }
 
 static void dm_bufio_unlock(struct dm_bufio_client *c)
 {
 	if (static_branch_unlikely(&no_sleep_enabled) && c->no_sleep)
-		spin_unlock_irqrestore(&c->spinlock, c->spinlock_flags);
+		spin_unlock_bh(&c->spinlock);
 	else
 		mutex_unlock(&c->lock);
 }
@@ -817,6 +815,10 @@ static struct dm_buffer *__get_unclaimed_buffer(struct dm_bufio_client *c)
 		BUG_ON(test_bit(B_WRITING, &b->state));
 		BUG_ON(test_bit(B_DIRTY, &b->state));
 
+		if (static_branch_unlikely(&no_sleep_enabled) && c->no_sleep &&
+		    unlikely(test_bit(B_READING, &b->state)))
+			continue;
+
 		if (!b->hold_count) {
 			__make_buffer_clean(b);
 			__unlink_buffer(b);
@@ -825,6 +827,9 @@ static struct dm_buffer *__get_unclaimed_buffer(struct dm_bufio_client *c)
 		cond_resched();
 	}
 
+	if (static_branch_unlikely(&no_sleep_enabled) && c->no_sleep)
+		return NULL;
+
 	list_for_each_entry_reverse(b, &c->lru[LIST_DIRTY], lru_list) {
 		BUG_ON(test_bit(B_READING, &b->state));
 
@@ -1632,7 +1637,8 @@ static void drop_buffers(struct dm_bufio_client *c)
  */
 static bool __try_evict_buffer(struct dm_buffer *b, gfp_t gfp)
 {
-	if (!(gfp & __GFP_FS)) {
+	if (!(gfp & __GFP_FS) ||
+	    (static_branch_unlikely(&no_sleep_enabled) && b->c->no_sleep)) {
 		if (test_bit(B_READING, &b->state) ||
 		    test_bit(B_WRITING, &b->state) ||
 		    test_bit(B_DIRTY, &b->state))

drivers/md/dm-verity-target.c

@@ -38,7 +38,7 @@
 #define DM_VERITY_OPT_AT_MOST_ONCE	"check_at_most_once"
 #define DM_VERITY_OPT_TASKLET_VERIFY	"try_verify_in_tasklet"
 
-#define DM_VERITY_OPTS_MAX		(3 + DM_VERITY_OPTS_FEC + \
+#define DM_VERITY_OPTS_MAX		(4 + DM_VERITY_OPTS_FEC + \
 					 DM_VERITY_ROOT_HASH_VERIFICATION_OPTS)
 
 static unsigned dm_verity_prefetch_cluster = DM_VERITY_DEFAULT_PREFETCH_SIZE;
@@ -1053,7 +1053,7 @@ static int verity_parse_opt_args(struct dm_arg_set *as, struct dm_verity *v,
 				 struct dm_verity_sig_opts *verify_args,
 				 bool only_modifier_opts)
 {
-	int r;
+	int r = 0;
 	unsigned argc;
 	struct dm_target *ti = v->ti;
 	const char *arg_name;
@@ -1123,8 +1123,18 @@ static int verity_parse_opt_args(struct dm_arg_set *as, struct dm_verity *v,
 			if (r)
 				return r;
 			continue;
+
+		} else if (only_modifier_opts) {
+			/*
+			 * Ignore unrecognized opt, could easily be an extra
+			 * argument to an option whose parsing was skipped.
+			 * Normal parsing (@only_modifier_opts=false) will
+			 * properly parse all options (and their extra args).
+			 */
+			continue;
 		}
 
+		DMERR("Unrecognized verity feature request: %s", arg_name);
 		ti->error = "Unrecognized verity feature request";
 		return -EINVAL;
 	} while (argc && !r);

drivers/md/dm-writecache.c

@@ -1594,7 +1594,8 @@ static int writecache_map(struct dm_target *ti, struct bio *bio)
 
 	default:
 		BUG();
-		return -1;
+		wc_unlock(wc);
+		return DM_MAPIO_KILL;
 	}
 }