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iomap: Lift blocksize restriction on atomic writes

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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>
This commit is contained in:
Ritesh Harjani (IBM) 2025-03-03 17:11:14 +00:00 committed by Christian Brauner
parent 794ca29dcc
commit 786e3080cb
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1 changed files with 1 additions and 1 deletions
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2
fs/iomap/direct-io.c
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@ -351,7 +351,7 @@ static int iomap_dio_bio_iter(struct iomap_iter *iter, struct iomap_dio *dio)
u64 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) ||