Re: [PATCH] iomap: keep on increasing i_size in iomap_write_end()

[Chandan Babu R <chandanbabu@kernel.org>]

On Mon, Jun 03, 2024 at 07:22:22 PM +0800, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@huawei.com>
>
> Commit '943bc0882ceb ("iomap: don't increase i_size if it's not a write
> operation")' breaks xfs with realtime device on generic/561, the problem
> is when unaligned truncate down a xfs realtime inode with rtextsize > 1
> fs block, xfs only zero out the EOF block but doesn't zero out the tail
> blocks that aligned to rtextsize, so if we don't increase i_size in
> iomap_write_end(), it could expose stale data after we do an append
> write beyond the aligned EOF block.
>
> xfs should zero out the tail blocks when truncate down, but before we
> finish that, let's fix the issue by just revert the changes in
> iomap_write_end().

I didn't notice any regressions with this patch applied. Hence,

Tested-by: Chandan Babu R <chandanbabu@kernel.org>

-- 
Chandan