ocfs2: remove ocfs2_prepare_write() and ocfs2_commit_write()

These are no longer used, and can't handle file systems with sparse file
allocation.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

fs/ocfs2/aops.c

@@ -277,8 +277,11 @@ static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
 	return ret;
 }
 
-/* This can also be called from ocfs2_write_zero_page() which has done
- * it's own cluster locking. */
+/*
+ * This is called from ocfs2_write_zero_page() which has handled it's
+ * own cluster locking and has ensured allocation exists for those
+ * blocks to be written.
+ */
 int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
 			       unsigned from, unsigned to)
 {
@@ -293,33 +296,6 @@ int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
 	return ret;
 }
 
-/*
- * ocfs2_prepare_write() can be an outer-most ocfs2 call when it is called
- * from loopback.  It must be able to perform its own locking around
- * ocfs2_get_block().
- */
-static int ocfs2_prepare_write(struct file *file, struct page *page,
-			       unsigned from, unsigned to)
-{
-	struct inode *inode = page->mapping->host;
-	int ret;
-
-	mlog_entry("(0x%p, 0x%p, %u, %u)\n", file, page, from, to);
-
-	ret = ocfs2_meta_lock_with_page(inode, NULL, 0, page);
-	if (ret != 0) {
-		mlog_errno(ret);
-		goto out;
-	}
-
-	ret = ocfs2_prepare_write_nolock(inode, page, from, to);
-
-	ocfs2_meta_unlock(inode, 0);
-out:
-	mlog_exit(ret);
-	return ret;
-}
-
 /* Taken from ext3. We don't necessarily need the full blown
  * functionality yet, but IMHO it's better to cut and paste the whole
  * thing so we can avoid introducing our own bugs (and easily pick up
@@ -389,95 +365,6 @@ handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
 	return handle;
 }
 
-static int ocfs2_commit_write(struct file *file, struct page *page,
-			      unsigned from, unsigned to)
-{
-	int ret;
-	struct buffer_head *di_bh = NULL;
-	struct inode *inode = page->mapping->host;
-	handle_t *handle = NULL;
-	struct ocfs2_dinode *di;
-
-	mlog_entry("(0x%p, 0x%p, %u, %u)\n", file, page, from, to);
-
-	/* NOTE: ocfs2_file_aio_write has ensured that it's safe for
-	 * us to continue here without rechecking the I/O against
-	 * changed inode values.
-	 *
-	 * 1) We're currently holding the inode alloc lock, so no
-	 *    nodes can change it underneath us.
-	 *
-	 * 2) We've had to take the metadata lock at least once
-	 *    already to check for extending writes, suid removal, etc.
-	 *    The meta data update code then ensures that we don't get a
-	 *    stale inode allocation image (i_size, i_clusters, etc).
-	 */
-
-	ret = ocfs2_meta_lock_with_page(inode, &di_bh, 1, page);
-	if (ret != 0) {
-		mlog_errno(ret);
-		goto out;
-	}
-
-	ret = ocfs2_data_lock_with_page(inode, 1, page);
-	if (ret != 0) {
-		mlog_errno(ret);
-		goto out_unlock_meta;
-	}
-
-	handle = ocfs2_start_walk_page_trans(inode, page, from, to);
-	if (IS_ERR(handle)) {
-		ret = PTR_ERR(handle);
-		goto out_unlock_data;
-	}
-
-	/* Mark our buffer early. We'd rather catch this error up here
-	 * as opposed to after a successful commit_write which would
-	 * require us to set back inode->i_size. */
-	ret = ocfs2_journal_access(handle, inode, di_bh,
-				   OCFS2_JOURNAL_ACCESS_WRITE);
-	if (ret < 0) {
-		mlog_errno(ret);
-		goto out_commit;
-	}
-
-	/* might update i_size */
-	ret = generic_commit_write(file, page, from, to);
-	if (ret < 0) {
-		mlog_errno(ret);
-		goto out_commit;
-	}
-
-	di = (struct ocfs2_dinode *)di_bh->b_data;
-
-	/* ocfs2_mark_inode_dirty() is too heavy to use here. */
-	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
-	di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
-	di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
-
-	inode->i_blocks = ocfs2_align_bytes_to_sectors((u64)(i_size_read(inode)));
-	di->i_size = cpu_to_le64((u64)i_size_read(inode));
-
-	ret = ocfs2_journal_dirty(handle, di_bh);
-	if (ret < 0) {
-		mlog_errno(ret);
-		goto out_commit;
-	}
-
-out_commit:
-	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
-out_unlock_data:
-	ocfs2_data_unlock(inode, 1);
-out_unlock_meta:
-	ocfs2_meta_unlock(inode, 1);
-out:
-	if (di_bh)
-		brelse(di_bh);
-
-	mlog_exit(ret);
-	return ret;
-}
-
 static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
 {
 	sector_t status;
@@ -1323,8 +1210,6 @@ ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos,
 const struct address_space_operations ocfs2_aops = {
 	.readpage	= ocfs2_readpage,
 	.writepage	= ocfs2_writepage,
-	.prepare_write	= ocfs2_prepare_write,
-	.commit_write	= ocfs2_commit_write,
 	.bmap		= ocfs2_bmap,
 	.sync_page	= block_sync_page,
 	.direct_IO	= ocfs2_direct_IO,