Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index fa36d76..20af62f 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -403,7 +403,7 @@
 	 * we do not require it to remember exactly which old buffers it
 	 * has reserved.  This is consistent with the existing behaviour
 	 * that multiple jbd2_journal_get_write_access() calls to the same
-	 * buffer are perfectly permissable.
+	 * buffer are perfectly permissible.
 	 */
 	while (commit_transaction->t_reserved_list) {
 		jh = commit_transaction->t_reserved_list;
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 90407b8..aba8eba 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -917,7 +917,7 @@
 	journal->j_wbufsize = n;
 	journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
 	if (!journal->j_wbuf) {
-		printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n",
+		printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n",
 			__func__);
 		goto out_err;
 	}
@@ -983,7 +983,7 @@
 	journal->j_wbufsize = n;
 	journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
 	if (!journal->j_wbuf) {
-		printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n",
+		printk(KERN_ERR "%s: Can't allocate bhs for commit thread\n",
 			__func__);
 		goto out_err;
 	}
diff --git a/fs/jbd2/revoke.c b/fs/jbd2/revoke.c
index 9ad321f..69fd935 100644
--- a/fs/jbd2/revoke.c
+++ b/fs/jbd2/revoke.c
@@ -71,7 +71,7 @@
  * switching hash tables under them. For operations on the lists of entries in
  * the hash table j_revoke_lock is used.
  *
- * Finally, also replay code uses the hash tables but at this moment noone else
+ * Finally, also replay code uses the hash tables but at this moment no one else
  * can touch them (filesystem isn't mounted yet) and hence no locking is
  * needed.
  */
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 1d11910..05fa77a 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1403,7 +1403,7 @@
 
 	/*
 	 * Once we drop t_updates, if it goes to zero the transaction
-	 * could start commiting on us and eventually disappear.  So
+	 * could start committing on us and eventually disappear.  So
 	 * once we do this, we must not dereference transaction
 	 * pointer again.
 	 */