Commit 0762704b authored by Chris Mason's avatar Chris Mason
Browse files

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: default avatarChris 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;

}

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