submit_bh_wbc() creates a bio matching the specific @bh and submits it
at the end. This patch separates out the bio creation part to its own
function, create_bh_bio(), and reimplement submit_bh[_wbc]() using the
function.
As bio can now be manipulated before submitted, we can move out @wbc
handling into submit_bh_wbc() and similarly this will make adding more
submit_bh variants straight-forward.
This patch is pure refactoring and doesn't cause any functional
changes.
Signed-off-by: Tejun Heo <t...@kernel.org>
Suggested-by: Jan Kara <j...@suse.cz>
---
fs/buffer.c | 30 ++++++++++++++++++++++--------
1 file changed, 22 insertions(+), 8 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 170df85..b4b2169 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3086,8 +3086,8 @@ void guard_bio_eod(int op, struct bio *bio)
}
}
-static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
- enum rw_hint write_hint, struct writeback_control *wbc)
+struct bio *create_bh_bio(int op, int op_flags, struct buffer_head *bh,
+ enum rw_hint write_hint)
{
struct bio *bio;
@@ -3109,11 +3109,6 @@ static int submit_bh_wbc(int op, int op_flags, struct
buffer_head *bh,
*/
bio = bio_alloc(GFP_NOIO, 1);
- if (wbc) {
- wbc_init_bio(wbc, bio);
- wbc_account_io(wbc, bh->b_page, bh->b_size);
- }
-
bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
bio_set_dev(bio, bh->b_bdev);
bio->bi_write_hint = write_hint;
@@ -3133,13 +3128,32 @@ static int submit_bh_wbc(int op, int op_flags, struct
buffer_head *bh,
op_flags |= REQ_PRIO;
bio_set_op_attrs(bio, op, op_flags);
+ return bio;
+}
+
+static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh,
+ enum rw_hint write_hint, struct writeback_control *wbc)
+{
+ struct bio *bio;
+
+ bio = create_bh_bio(op, op_flags, bh, write_hint);
+
+ if (wbc) {
+ wbc_init_bio(wbc, bio);
+ wbc_account_io(wbc, bh->b_page, bh->b_size);
+ }
+
submit_bio(bio);
return 0;
}
int submit_bh(int op, int op_flags, struct buffer_head *bh)
{
- return submit_bh_wbc(op, op_flags, bh, 0, NULL);
+ struct bio *bio;
+
+ bio = create_bh_bio(op, op_flags, bh, 0);
+ submit_bio(bio);
+ return 0;
}
EXPORT_SYMBOL(submit_bh);
--
2.9.5
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