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Commit 50a9b214 authored by Chris Mason's avatar Chris Mason
Browse files

Btrfs: fix btrfs page_mkwrite to return locked page 



This closes a whole where the page may be written before
the page_mkwrite caller has a chance to dirty it

(thanks to Nick Piggin)

Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent a1ed835e

fs/btrfs/inode.c

+3 −0
Original line number Diff line number Diff line
@@ -4552,11 +4552,14 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 
	}

	ClearPageChecked(page);

	set_page_dirty(page);

	SetPageUptodate(page);



	BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;

	unlock_extent(io_tree, page_start, page_end, GFP_NOFS);



out_unlock:

	if (!ret)

		return VM_FAULT_LOCKED;

	unlock_page(page);

out:

	return ret;