From b53fdb215d13f8e9c29541434bf2d14dac8bcbdc Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 10 Sep 2024 07:39:04 +0300 Subject: [PATCH] iomap: improve shared block detection in iomap_unshare_iter Currently iomap_unshare_iter relies on the IOMAP_F_SHARED flag to detect blocks to unshare. This is reasonable, but IOMAP_F_SHARED is also useful for the file system to do internal book keeping for out of place writes. XFS used to that, until it got removed in commit 72a048c1056a ("xfs: only set IOMAP_F_SHARED when providing a srcmap to a write") because unshare for incorrectly unshare such blocks. Add an extra safeguard by checking the explicitly provided srcmap instead of the fallback to the iomap for valid data, as that catches the case where we'd just copy from the same place we'd write to easily, allowing to reinstate setting IOMAP_F_SHARED for all XFS writes that go to the COW fork. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20240910043949.3481298-3-hch@lst.de Reviewed-by: Darrick J. Wong Signed-off-by: Christian Brauner --- fs/iomap/buffered-io.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index db7a3ff92e61..a00b213967e5 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1338,16 +1338,25 @@ EXPORT_SYMBOL_GPL(iomap_file_buffered_write_punch_delalloc); static loff_t iomap_unshare_iter(struct iomap_iter *iter) { struct iomap *iomap = &iter->iomap; - const struct iomap *srcmap = iomap_iter_srcmap(iter); loff_t pos = iter->pos; loff_t length = iomap_length(iter); loff_t written = 0; - /* don't bother with blocks that are not shared to start with */ + /* Don't bother with blocks that are not shared to start with. */ if (!(iomap->flags & IOMAP_F_SHARED)) return length; - /* don't bother with holes or unwritten extents */ - if (srcmap->type == IOMAP_HOLE || srcmap->type == IOMAP_UNWRITTEN) + + /* + * Don't bother with holes or unwritten extents. + * + * Note that we use srcmap directly instead of iomap_iter_srcmap as + * unsharing requires providing a separate source map, and the presence + * of one is a good indicator that unsharing is needed, unlike + * IOMAP_F_SHARED which can be set for any data that goes into the COW + * fork for XFS. + */ + if (iter->srcmap.type == IOMAP_HOLE || + iter->srcmap.type == IOMAP_UNWRITTEN) return length; do {