Btrfs: Properly clear dirty and delalloc extent bits while preparing the file for write



Yan Zheng noticed that we don't clear the extent state tree dirty and delalloc
bits when we clear the dirty bits on the page during file write.

This leads to csum errors later on.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

parent 952fccac

fs/btrfs/file.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -762,6 +762,13 @@ static int prepare_pages(struct btrfs_root root, struct file file,
		set_page_extent_mapped(pages[i]);
		WARN_ON(!PageLocked(pages[i]));
		}
		if (start_pos < inode->i_size) {
		u64 last_pos;
		last_pos = (index + num_pages) << PAGE_CACHE_SHIFT;
		clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos,
		last_pos - 1, EXTENT_DIRTY \| EXTENT_DELALLOC,
		GFP_NOFS);
		}
		return 0;
		}