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SubjectRe: [PATCH v2] fs: Fix page_mkwrite off-by-one errors
On Fri, Nov 29, 2019 at 03:20:45PM +0100, Andreas Gruenbacher wrote:
> The check in block_page_mkwrite meant to determine whether an offset is
> within the inode size is off by one. This bug has spread to
> iomap_page_mkwrite and to several filesystems (ubifs, ext4, f2fs, ceph).
> To fix that, introduce a new page_mkwrite_check_truncate helper that
> checks for truncate and computes the bytes in the page up to EOF, and
> use that helper in the above mentioned filesystems and in btrfs.
> Signed-off-by: Andreas Gruenbacher <>
> ---
> This patch has a trivial conflict with commit "iomap: Fix overflow in
> iomap_page_mkwrite" in Darrick's iomap pull request for 5.5:
> ---
> fs/btrfs/inode.c | 15 ++++-----------

For the btrfs part

Acked-by: David Sterba <>

and reviewed that the change is equivalent.

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