From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com> mainline inclusion from mainline-v6.14-rc1 commit 786e3080cbe916f6a4c0987124d4f930c1814a97 category: feature bugzilla: https://atomgit.com/src-openeuler/kernel/issues/8862 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- Filesystems like ext4 can submit writes in multiples of blocksizes. But we still can't allow the writes to be split. Hence let's check if the iomap_length() is same as iter->len or not. It is the role of the FS to ensure that a single mapping may be created for an atomic write. The FS will also continue to check size and alignment legality. Signed-off-by: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com> jpg: Tweak commit message Reviewed-by: "Darrick J. Wong" <djwong@kernel.org> Signed-off-by: John Garry <john.g.garry@oracle.com> Link: https://lore.kernel.org/r/20250303171120.2837067-7-john.g.garry@oracle.com Signed-off-by: Christian Brauner <brauner@kernel.org> Conflicts: fs/iomap/direct-io.c [Context conflicts] Signed-off-by: Long Li <leo.lilong@huawei.com> --- fs/iomap/direct-io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 98022382baa6..4933c3517342 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -302,7 +302,7 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter, size_t copied = 0; size_t orig_count; - if (atomic && length != fs_block_size) + if (atomic && length != iter->len) return -EINVAL; if ((pos | length) & (bdev_logical_block_size(iomap->bdev) - 1) || -- 2.52.0