Re: [PATCH] cifs: call pagecache_isize_extended() in cifs_setsize() when extending

On Fri, Aug 21, 2026 at 6:13 AM Frank Sorenson <[email protected]> wrote:
>
> cifs_setsize() calls truncate_pagecache() but skips
> pagecache_isize_extended() on extension.  truncate_setsize() shows
> the correct pattern:
>
>   i_size_write(inode, newsize);
>   if (newsize > oldsize)
>       pagecache_isize_extended(inode, oldsize, newsize);
>   truncate_pagecache(inode, newsize);
>
> pagecache_isize_extended() zeroes the tail of the page straddling old
> EOF.  Without it, dirty bytes in that region can be written back to
> the server, exposing stale data in the newly extended range.
>
> Cc: [email protected]
> Cc: David Howells <[email protected]>
> Signed-off-by: Frank Sorenson <[email protected]>
Acked-by: Namjae Jeon <[email protected]>
Thanks.