On Thu, Nov 16, 2023 at 02:40:10PM +0800, zhangshida wrote:
From: "Matthew Wilcox (Oracle)" willy@infradead.org
commit 4595a298d5563cf76c1d852970f162051fd1a7a6 upstream.
For filesystems with block size < page size, we need to set all the per-block uptodate bits if the page was already uptodate at the time we create the per-block metadata. This can happen if the page is invalidated (eg by a write to drop_caches) but ultimately not removed from the page cache.
This is a data corruption issue as page writeback skips blocks which are marked !uptodate.
Fixes: 9dc55f1389f9 ("iomap: add support for sub-pagesize buffered I/O without buffer heads") Signed-off-by: Matthew Wilcox (Oracle) willy@infradead.org Reported-by: Qian Cai cai@redhat.com Cc: Brian Foster bfoster@redhat.com Reviewed-by: Gao Xiang hsiangkao@redhat.com Reviewed-by: Darrick J. Wong darrick.wong@oracle.com Signed-off-by: Darrick J. Wong darrick.wong@oracle.com Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Shida Zhang zhangshida@kylinos.cn
fs/iomap.c | 3 +++ 1 file changed, 3 insertions(+)
Now queued up, thanks.
greg k-h