ext4: fold ext4_journal_revoke() into ext4_forget()

The only caller of ext4_journal_revoke() is ext4_forget(), so we can
fold ext4_journal_revoke() into ext4_forget() to simplify the code and
shorten the call stack.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

fs/ext4/ext4_jbd2.c

@@ -50,22 +50,6 @@ int __ext4_journal_forget(const char *where, handle_t *handle,
 	return err;
 }
 
-int __ext4_journal_revoke(const char *where, handle_t *handle,
-				ext4_fsblk_t blocknr, struct buffer_head *bh)
-{
-	int err = 0;
-
-	if (ext4_handle_valid(handle)) {
-		err = jbd2_journal_revoke(handle, blocknr, bh);
-		if (err)
-			ext4_journal_abort_handle(where, __func__, bh,
-						  handle, err);
-	}
-	else
-		bforget(bh);
-	return err;
-}
-
 /*
  * The ext4 forget function must perform a revoke if we are freeing data
  * which has been journaled.  Metadata (eg. indirect blocks) must be
@@ -94,6 +78,12 @@ int __ext4_forget(const char *where, handle_t *handle, int is_metadata,
 		  bh, is_metadata, inode->i_mode,
 		  test_opt(inode->i_sb, DATA_FLAGS));
 
+	/* In the no journal case, we can just do a bforget and return */
+	if (!ext4_handle_valid(handle)) {
+		bforget(bh);
+		return 0;
+	}
+
 	/* Never use the revoke function if we are doing full data
 	 * journaling: there is no need to, and a V1 superblock won't
 	 * support it.  Otherwise, only skip the revoke on un-journaled
@@ -111,11 +101,13 @@ int __ext4_forget(const char *where, handle_t *handle, int is_metadata,
 	/*
 	 * data!=journal && (is_metadata || should_journal_data(inode))
 	 */
-	BUFFER_TRACE(bh, "call ext4_journal_revoke");
-	err = __ext4_journal_revoke(where, handle, blocknr, bh);
-	if (err)
+	BUFFER_TRACE(bh, "call jbd2_journal_revoke");
+	err = jbd2_journal_revoke(handle, blocknr, bh);
+	if (err) {
+		ext4_journal_abort_handle(where, __func__, bh, handle, err);
 		ext4_abort(inode->i_sb, __func__,
 			   "error %d when attempting revoke", err);
+	}
 	BUFFER_TRACE(bh, "exit");
 	return err;
 }

fs/ext4/ext4_jbd2.h

@@ -116,12 +116,8 @@ int ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
 int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode);
 
 /*
- * Wrapper functions with which ext4 calls into JBD.  The intent here is
- * to allow these to be turned into appropriate stubs so ext4 can control
- * ext2 filesystems, so ext2+ext4 systems only nee one fs.  This work hasn't
- * been done yet.
+ * Wrapper functions with which ext4 calls into JBD.
  */
-
 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
 		struct buffer_head *bh, handle_t *handle, int err);
 
@@ -135,10 +131,6 @@ int __ext4_journal_get_write_access(const char *where, handle_t *handle,
 int __ext4_journal_forget(const char *where, handle_t *handle,
 				struct buffer_head *bh);
 
-/* When called with an invalid handle, this will still do a put on the BH */
-int __ext4_journal_revoke(const char *where, handle_t *handle,
-				ext4_fsblk_t blocknr, struct buffer_head *bh);
-
 int __ext4_forget(const char *where, handle_t *handle, int is_metadata,
 		  struct inode *inode, struct buffer_head *bh,
 		  ext4_fsblk_t blocknr);
@@ -153,8 +145,6 @@ int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
 	__ext4_journal_get_undo_access(__func__, (handle), (bh))
 #define ext4_journal_get_write_access(handle, bh) \
 	__ext4_journal_get_write_access(__func__, (handle), (bh))
-#define ext4_journal_revoke(handle, blocknr, bh) \
-	__ext4_journal_revoke(__func__, (handle), (blocknr), (bh))
 #define ext4_forget(handle, is_metadata, inode, bh, block_nr) \
 	__ext4_forget(__func__, (handle), (is_metadata), (inode), (bh),\
 		      (block_nr))