On Thu, Oct 8, 2020 at 5:56 PM Ritesh Harjani <riteshh@xxxxxxxxxxxxx> wrote:
>
> left shifting m_lblk by blkbits was causing value overflow and hence
> it was not able to convert unwritten to written extent.
> So, make sure we typecast it to loff_t before do left shift operation.
> Also in func ext4_convert_unwritten_io_end_vec(), make sure to initialize
> ret variable to avoid accidentally returning an uninitialized ret.
>
> This patch fixes the issue reported in ext4 for bs < ps with
> dioread_nolock mount option.
>
> Fixes: c8cc88163f40df39e50c ("ext4: Add support for blocksize < pagesize in dioread_nolock")
Fixes: tag should be 12 digits (see [1]).
( Seen while walking through ext-dev Git commits. )
- Sedat -
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst#n183
> Reported-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
> Signed-off-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxx>
> ---
> fs/ext4/extents.c | 2 +-
> fs/ext4/inode.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index a0481582187a..32d610cc896d 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -4769,7 +4769,7 @@ int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
>
> int ext4_convert_unwritten_io_end_vec(handle_t *handle, ext4_io_end_t *io_end)
> {
> - int ret, err = 0;
> + int ret = 0, err = 0;
> struct ext4_io_end_vec *io_end_vec;
>
> /*
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index bf596467c234..3021235deaa1 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -2254,7 +2254,7 @@ static int mpage_process_page(struct mpage_da_data *mpd, struct page *page,
> err = PTR_ERR(io_end_vec);
> goto out;
> }
> - io_end_vec->offset = mpd->map.m_lblk << blkbits;
> + io_end_vec->offset = (loff_t)mpd->map.m_lblk << blkbits;
> }
> *map_bh = true;
> goto out;
> --
> 2.26.2
>
