Add two helper macros calculating the offset of bio in struct dm_io and
struct dm_target_io respectively.
Besides, simplify the front padding calculation in
dm_alloc_md_mempools().
Signed-off-by: Jeffle Xu <jefflexu@xxxxxxxxxxxxxxxxx>
---
drivers/md/dm.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index b3c3c8b4cb42..b992fdaa297a 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -105,12 +105,16 @@ struct dm_io {
struct dm_target_io tio;
};
+#define DM_TARGET_IO_BIO_OFFSET (offsetof(struct dm_target_io, clone))
+#define DM_IO_BIO_OFFSET \
+ (offsetof(struct dm_target_io, clone) + offsetof(struct dm_io, tio))
+
void *dm_per_bio_data(struct bio *bio, size_t data_size)
{
struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
if (!tio->inside_dm_io)
- return (char *)bio - offsetof(struct dm_target_io, clone) - data_size;
- return (char *)bio - offsetof(struct dm_target_io, clone) - offsetof(struct dm_io, tio) - data_size;
+ return (char *)bio - DM_TARGET_IO_BIO_OFFSET - data_size;
+ return (char *)bio - DM_IO_BIO_OFFSET - data_size;
}
EXPORT_SYMBOL_GPL(dm_per_bio_data);
@@ -118,9 +122,9 @@ struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size)
{
struct dm_io *io = (struct dm_io *)((char *)data + data_size);
if (io->magic == DM_IO_MAGIC)
- return (struct bio *)((char *)io + offsetof(struct dm_io, tio) + offsetof(struct dm_target_io, clone));
+ return (struct bio *)((char *)io + DM_IO_BIO_OFFSET);
BUG_ON(io->magic != DM_TIO_MAGIC);
- return (struct bio *)((char *)io + offsetof(struct dm_target_io, clone));
+ return (struct bio *)((char *)io + DM_TARGET_IO_BIO_OFFSET);
}
EXPORT_SYMBOL_GPL(dm_bio_from_per_bio_data);
@@ -2849,8 +2853,8 @@ struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_qu
case DM_TYPE_BIO_BASED:
case DM_TYPE_DAX_BIO_BASED:
pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size);
- front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone);
- io_front_pad = roundup(front_pad, __alignof__(struct dm_io)) + offsetof(struct dm_io, tio);
+ front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + DM_TARGET_IO_BIO_OFFSET;
+ io_front_pad = roundup(per_io_data_size, __alignof__(struct dm_io)) + DM_IO_BIO_OFFSET;
ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, 0);
if (ret)
goto out;
--
2.27.0
--
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