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iomap: factor out iomap_dio_alignment helper

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Extract the alignment computation from iomap_dio_bio_iter() into a
standalone helper so the upcoming simple direct I/O path can reuse it
without requiring a struct iomap_dio.

No functional change.

Signed-off-by: Fengnan Chang <changfengnan@bytedance.com>
Link: https://patch.msgid.link/20260701033253.46420-2-changfengnan@bytedance.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Fengnan Chang 2026-07-01 11:32:51 +08:00 committed by Christian Brauner
parent e08fd61191
commit 27b7efca5b
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 9 additions and 4 deletions
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13
fs/iomap/direct-io.c
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@ -398,6 +398,14 @@ static ssize_t iomap_dio_bio_iter_one(struct iomap_iter *iter,
return ret;
}
static inline unsigned int iomap_dio_alignment(struct inode *inode,
struct block_device *bdev, unsigned int dio_flags)
{
if (dio_flags & IOMAP_DIO_FSBLOCK_ALIGNED)
return i_blocksize(inode);
return bdev_logical_block_size(bdev);
}
static int iomap_dio_bio_iter(struct iomap_iter *iter, struct iomap_dio *dio)
{
const struct iomap *iomap = &iter->iomap;
@ -416,10 +424,7 @@ static int iomap_dio_bio_iter(struct iomap_iter *iter, struct iomap_dio *dio)
* File systems that write out of place and always allocate new blocks
* need each bio to be block aligned as that's the unit of allocation.
*/
if (dio->flags & IOMAP_DIO_FSBLOCK_ALIGNED)
alignment = fs_block_size;
else
alignment = bdev_logical_block_size(iomap->bdev);
alignment = iomap_dio_alignment(inode, iomap->bdev, dio->flags);
if ((pos | length) & (alignment - 1))
return -EINVAL;