diff mbox series

[v3,06/12] iomap: Lift blocksize restriction on atomic writes

Message ID 20250227180813.1553404-7-john.g.garry@oracle.com (mailing list archive)
State New
Headers show
Series large atomic writes for xfs with CoW | expand

Commit Message

John Garry Feb. 27, 2025, 6:08 p.m. UTC 
From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>

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>
---
 fs/iomap/direct-io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 575bb69db00e..96520a38b427 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -306,7 +306,7 @@  static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter,
 	size_t copied = 0;
 	size_t orig_count;
 
-	if (atomic_hw && length != fs_block_size)
+	if (atomic_hw && length != iter->len)
 		return -EINVAL;
 
 	if ((pos | length) & (bdev_logical_block_size(iomap->bdev) - 1) ||