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| author | Jeffle Xu <jefflexu@linux.alibaba.com> | 2021-01-12 13:52:00 +0800 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2021-02-03 10:10:05 -0500 |
| commit | 62f263178c16df300f92098c1a6edca0be7d204d (patch) | |
| tree | f03a3520bd687cf054020832f55b31c03d5d946c /drivers/md/dm.c | |
| parent | 23c4ecbc3e6af3e2c5d7ce2134a39b73b81947d0 (diff) | |
| download | linux-62f263178c16df300f92098c1a6edca0be7d204d.tar.bz2 | |
dm: cleanup of front padding calculation
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@linux.alibaba.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 479ec5bea09e..65b21159a7a6 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; |