md: fix typos in comments

Fix typos in comments, reported by scripts/checkpatch.pl using the
misspelling list in scripts/spelling.txt.  Only touches comments, no code
changes.

Assisted-by: Cursor:claude-opus-5
Signed-off-by: Hemanth Selam <hemanth.selam@gmail.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

drivers/md/dm-cache-metadata.c

@@ -49,7 +49,7 @@ enum superblock_flag_bits {
 enum mapping_bits {
 	/*
 	 * A valid mapping.  Because we're using an array we clear this
-	 * flag for an non existant mapping.
+	 * flag for an non existent mapping.
 	 */
 	M_VALID = 1,
 

drivers/md/dm-crypt.c

@@ -2365,7 +2365,7 @@ static unsigned int crypt_authenckey_size(struct crypt_config *cc)
 /*
  * If AEAD is composed like authenc(hmac(sha256),xts(aes)),
  * the key must be for some reason in special format.
- * This funcion converts cc->key to this special format.
+ * This function converts cc->key to this special format.
  */
 static void crypt_copy_authenckey(char *p, const void *key,
 				  unsigned int enckeylen, unsigned int authkeylen)

drivers/md/dm-exception-store.h

@@ -135,7 +135,7 @@ struct dm_dev *dm_snap_origin(struct dm_snapshot *snap);
 struct dm_dev *dm_snap_cow(struct dm_snapshot *snap);
 
 /*
- * Funtions to manipulate consecutive chunks
+ * Functions to manipulate consecutive chunks
  */
 #define DM_CHUNK_CONSECUTIVE_BITS 8
 #define DM_CHUNK_NUMBER_BITS 56

drivers/md/dm-raid.c

@@ -1784,7 +1784,7 @@ static int rs_check_takeover(struct raid_set *rs)
 
 		/* raid10* -> raid0 */
 		if (mddev->new_level == 0) {
-			/* Can takeover raid10_near with raid disks divisable by data copies! */
+			/* Can takeover raid10_near with raid disks divisible by data copies! */
 			if (near_copies > 1 &&
 			    !(mddev->raid_disks % near_copies)) {
 				mddev->raid_disks /= near_copies;

drivers/md/dm-raid1.c

@@ -1393,7 +1393,7 @@ static void mirror_resume(struct dm_target *ti)
  * we have encountered.
  *    A => Alive - No failures
  *    D => Dead - A write failure occurred leaving mirror out-of-sync
- *    S => Sync - A sychronization failure occurred, mirror out-of-sync
+ *    S => Sync - A synchronization failure occurred, mirror out-of-sync
  *    R => Read - A read failure occurred, mirror data unaffected
  *
  * Returns: <char>

drivers/md/dm-unstripe.c

@@ -33,7 +33,7 @@ static void cleanup_unstripe(struct unstripe_c *uc, struct dm_target *ti)
 }
 
 /*
- * Contruct an unstriped mapping.
+ * Construct an unstriped mapping.
  * <number of stripes> <chunk size> <stripe #> <dev_path> <offset>
  */
 static int unstripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)

drivers/md/persistent-data/dm-btree-remove.c

@@ -31,7 +31,7 @@
  * least MIN_ENTRIES + 1.  We do this in the following ways:
  *
  * [A] No siblings => this can only happen if the node is the root, in which
- *     case we copy the childs contents over the root.
+ *     case we copy the children contents over the root.
  *
  * [B] No left sibling
  *     ==> rebalance(node, right sibling)